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authorGuenter Roeck <guenter.roeck@ericsson.com>2011-01-26 23:09:02 -0500
committerGuenter Roeck <guenter.roeck@ericsson.com>2011-03-15 01:36:26 -0400
commit442aba78728e77e03172ba83e905b9aff96febcf (patch)
treefe6c99958017922dafd4010c3af2c8c8b6441057
parent06923f84422371a6fb10b3efcd05b80ab48715c0 (diff)
hwmon: PMBus device driver
This driver adds support for hardware monitoring features of various PMBus devices. Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com> Acked-by: Jonathan Cameron <jic23@cam.ac.uk>
Diffstat
-rw-r--r--drivers/hwmon/Kconfig25
-rw-r--r--drivers/hwmon/Makefile4
-rw-r--r--drivers/hwmon/pmbus.c203
-rw-r--r--drivers/hwmon/pmbus.h313
-rw-r--r--drivers/hwmon/pmbus_core.c1628
-rw-r--r--include/linux/i2c/pmbus.h45
6 files changed, 2218 insertions, 0 deletions
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index d4ffc6052083..ac116693e357 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -756,6 +756,31 @@ config SENSORS_PCF8591
756 These devices are hard to detect and rarely found on mainstream 756 These devices are hard to detect and rarely found on mainstream
757 hardware. If unsure, say N. 757 hardware. If unsure, say N.
758 758
759config PMBUS
760 tristate "PMBus support"
761 depends on I2C && EXPERIMENTAL
762 default n
763 help
764 Say yes here if you want to enable PMBus support.
765
766 This driver can also be built as a module. If so, the module will
767 be called pmbus_core.
768
769if PMBUS
770
771config SENSORS_PMBUS
772 tristate "Generic PMBus devices"
773 default n
774 help
775 If you say yes here you get hardware monitoring support for generic
776 PMBus devices, including but not limited to BMR450, BMR451, BMR453,
777 BMR454, and LTC2978.
778
779 This driver can also be built as a module. If so, the module will
780 be called pmbus.
781
782endif # PMBUS
783
759config SENSORS_SHT15 784config SENSORS_SHT15
760 tristate "Sensiron humidity and temperature sensors. SHT15 and compat." 785 tristate "Sensiron humidity and temperature sensors. SHT15 and compat."
761 depends on GENERIC_GPIO 786 depends on GENERIC_GPIO
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index 46819818ef51..09e67955fd57 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -114,6 +114,10 @@ obj-$(CONFIG_SENSORS_W83L786NG) += w83l786ng.o
114obj-$(CONFIG_SENSORS_WM831X) += wm831x-hwmon.o 114obj-$(CONFIG_SENSORS_WM831X) += wm831x-hwmon.o
115obj-$(CONFIG_SENSORS_WM8350) += wm8350-hwmon.o 115obj-$(CONFIG_SENSORS_WM8350) += wm8350-hwmon.o
116 116
117# PMBus drivers
118obj-$(CONFIG_PMBUS) += pmbus_core.o
119obj-$(CONFIG_SENSORS_PMBUS) += pmbus.o
120
117ifeq ($(CONFIG_HWMON_DEBUG_CHIP),y) 121ifeq ($(CONFIG_HWMON_DEBUG_CHIP),y)
118EXTRA_CFLAGS += -DDEBUG 122EXTRA_CFLAGS += -DDEBUG
119endif 123endif
diff --git a/drivers/hwmon/pmbus.c b/drivers/hwmon/pmbus.c
new file mode 100644
index 000000000000..98e2e28899e2
--- /dev/null
+++ b/drivers/hwmon/pmbus.c
@@ -0,0 +1,203 @@
1/*
2 * Hardware monitoring driver for PMBus devices
3 *
4 * Copyright (c) 2010, 2011 Ericsson AB.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 */
20
21#include <linux/kernel.h>
22#include <linux/module.h>
23#include <linux/init.h>
24#include <linux/err.h>
25#include <linux/slab.h>
26#include <linux/mutex.h>
27#include <linux/i2c.h>
28#include "pmbus.h"
29
30/*
31 * Find sensor groups and status registers on each page.
32 */
33static void pmbus_find_sensor_groups(struct i2c_client *client,
34 struct pmbus_driver_info *info)
35{
36 int page;
37
38 /* Sensors detected on page 0 only */
39 if (pmbus_check_word_register(client, 0, PMBUS_READ_VIN))
40 info->func[0] |= PMBUS_HAVE_VIN;
41 if (pmbus_check_word_register(client, 0, PMBUS_READ_VCAP))
42 info->func[0] |= PMBUS_HAVE_VCAP;
43 if (pmbus_check_word_register(client, 0, PMBUS_READ_IIN))
44 info->func[0] |= PMBUS_HAVE_IIN;
45 if (pmbus_check_word_register(client, 0, PMBUS_READ_PIN))
46 info->func[0] |= PMBUS_HAVE_PIN;
47 if (info->func[0]
48 && pmbus_check_byte_register(client, 0, PMBUS_STATUS_INPUT))
49 info->func[0] |= PMBUS_HAVE_STATUS_INPUT;
50 if (pmbus_check_word_register(client, 0, PMBUS_READ_FAN_SPEED_1)) {
51 info->func[0] |= PMBUS_HAVE_FAN12;
52 if (pmbus_check_byte_register(client, 0, PMBUS_STATUS_FAN_12))
53 info->func[0] |= PMBUS_HAVE_STATUS_FAN12;
54 }
55 if (pmbus_check_word_register(client, 0, PMBUS_READ_FAN_SPEED_3)) {
56 info->func[0] |= PMBUS_HAVE_FAN34;
57 if (pmbus_check_byte_register(client, 0, PMBUS_STATUS_FAN_34))
58 info->func[0] |= PMBUS_HAVE_STATUS_FAN34;
59 }
60 if (pmbus_check_word_register(client, 0, PMBUS_READ_TEMPERATURE_1)) {
61 info->func[0] |= PMBUS_HAVE_TEMP;
62 if (pmbus_check_byte_register(client, 0,
63 PMBUS_STATUS_TEMPERATURE))
64 info->func[0] |= PMBUS_HAVE_STATUS_TEMP;
65 }
66
67 /* Sensors detected on all pages */
68 for (page = 0; page < info->pages; page++) {
69 if (pmbus_check_word_register(client, page, PMBUS_READ_VOUT)) {
70 info->func[page] |= PMBUS_HAVE_VOUT;
71 if (pmbus_check_byte_register(client, page,
72 PMBUS_STATUS_VOUT))
73 info->func[page] |= PMBUS_HAVE_STATUS_VOUT;
74 }
75 if (pmbus_check_word_register(client, page, PMBUS_READ_IOUT)) {
76 info->func[page] |= PMBUS_HAVE_IOUT;
77 if (pmbus_check_byte_register(client, 0,
78 PMBUS_STATUS_IOUT))
79 info->func[page] |= PMBUS_HAVE_STATUS_IOUT;
80 }
81 if (pmbus_check_word_register(client, page, PMBUS_READ_POUT))
82 info->func[page] |= PMBUS_HAVE_POUT;
83 }
84}
85
86/*
87 * Identify chip parameters.
88 */
89static int pmbus_identify(struct i2c_client *client,
90 struct pmbus_driver_info *info)
91{
92 if (!info->pages) {
93 /*
94 * Check if the PAGE command is supported. If it is,
95 * keep setting the page number until it fails or until the
96 * maximum number of pages has been reached. Assume that
97 * this is the number of pages supported by the chip.
98 */
99 if (pmbus_check_byte_register(client, 0, PMBUS_PAGE)) {
100 int page;
101
102 for (page = 1; page < PMBUS_PAGES; page++) {
103 if (pmbus_set_page(client, page) < 0)
104 break;
105 }
106 pmbus_set_page(client, 0);
107 info->pages = page;
108 } else {
109 info->pages = 1;
110 }
111 }
112
113 /*
114 * We should check if the COEFFICIENTS register is supported.
115 * If it is, and the chip is configured for direct mode, we can read
116 * the coefficients from the chip, one set per group of sensor
117 * registers.
118 *
119 * To do this, we will need access to a chip which actually supports the
120 * COEFFICIENTS command, since the command is too complex to implement
121 * without testing it.
122 */
123
124 /* Try to find sensor groups */
125 pmbus_find_sensor_groups(client, info);
126
127 return 0;
128}
129
130static int pmbus_probe(struct i2c_client *client,
131 const struct i2c_device_id *id)
132{
133 struct pmbus_driver_info *info;
134 int ret;
135
136 info = kzalloc(sizeof(struct pmbus_driver_info), GFP_KERNEL);
137 if (!info)
138 return -ENOMEM;
139
140 info->pages = id->driver_data;
141 info->identify = pmbus_identify;
142
143 ret = pmbus_do_probe(client, id, info);
144 if (ret < 0)
145 goto out;
146 return 0;
147
148out:
149 kfree(info);
150 return ret;
151}
152
153static int pmbus_remove(struct i2c_client *client)
154{
155 int ret;
156 const struct pmbus_driver_info *info;
157
158 info = pmbus_get_driver_info(client);
159 ret = pmbus_do_remove(client);
160 kfree(info);
161 return ret;
162}
163
164/*
165 * Use driver_data to set the number of pages supported by the chip.
166 */
167static const struct i2c_device_id pmbus_id[] = {
168 {"bmr450", 1},
169 {"bmr451", 1},
170 {"bmr453", 1},
171 {"bmr454", 1},
172 {"ltc2978", 8},
173 {"pmbus", 0},
174 {}
175};
176
177MODULE_DEVICE_TABLE(i2c, pmbus_id);
178
179/* This is the driver that will be inserted */
180static struct i2c_driver pmbus_driver = {
181 .driver = {
182 .name = "pmbus",
183 },
184 .probe = pmbus_probe,
185 .remove = pmbus_remove,
186 .id_table = pmbus_id,
187};
188
189static int __init pmbus_init(void)
190{
191 return i2c_add_driver(&pmbus_driver);
192}
193
194static void __exit pmbus_exit(void)
195{
196 i2c_del_driver(&pmbus_driver);
197}
198
199MODULE_AUTHOR("Guenter Roeck");
200MODULE_DESCRIPTION("Generic PMBus driver");
201MODULE_LICENSE("GPL");
202module_init(pmbus_init);
203module_exit(pmbus_exit);
diff --git a/drivers/hwmon/pmbus.h b/drivers/hwmon/pmbus.h
new file mode 100644
index 000000000000..a81f7f228762
--- /dev/null
+++ b/drivers/hwmon/pmbus.h
@@ -0,0 +1,313 @@
1/*
2 * pmbus.h - Common defines and structures for PMBus devices
3 *
4 * Copyright (c) 2010, 2011 Ericsson AB.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 */
20
21#ifndef PMBUS_H
22#define PMBUS_H
23
24/*
25 * Registers
26 */
27#define PMBUS_PAGE 0x00
28#define PMBUS_OPERATION 0x01
29#define PMBUS_ON_OFF_CONFIG 0x02
30#define PMBUS_CLEAR_FAULTS 0x03
31#define PMBUS_PHASE 0x04
32
33#define PMBUS_CAPABILITY 0x19
34#define PMBUS_QUERY 0x1A
35
36#define PMBUS_VOUT_MODE 0x20
37#define PMBUS_VOUT_COMMAND 0x21
38#define PMBUS_VOUT_TRIM 0x22
39#define PMBUS_VOUT_CAL_OFFSET 0x23
40#define PMBUS_VOUT_MAX 0x24
41#define PMBUS_VOUT_MARGIN_HIGH 0x25
42#define PMBUS_VOUT_MARGIN_LOW 0x26
43#define PMBUS_VOUT_TRANSITION_RATE 0x27
44#define PMBUS_VOUT_DROOP 0x28
45#define PMBUS_VOUT_SCALE_LOOP 0x29
46#define PMBUS_VOUT_SCALE_MONITOR 0x2A
47
48#define PMBUS_COEFFICIENTS 0x30
49#define PMBUS_POUT_MAX 0x31
50
51#define PMBUS_FAN_CONFIG_12 0x3A
52#define PMBUS_FAN_COMMAND_1 0x3B
53#define PMBUS_FAN_COMMAND_2 0x3C
54#define PMBUS_FAN_CONFIG_34 0x3D
55#define PMBUS_FAN_COMMAND_3 0x3E
56#define PMBUS_FAN_COMMAND_4 0x3F
57
58#define PMBUS_VOUT_OV_FAULT_LIMIT 0x40
59#define PMBUS_VOUT_OV_FAULT_RESPONSE 0x41
60#define PMBUS_VOUT_OV_WARN_LIMIT 0x42
61#define PMBUS_VOUT_UV_WARN_LIMIT 0x43
62#define PMBUS_VOUT_UV_FAULT_LIMIT 0x44
63#define PMBUS_VOUT_UV_FAULT_RESPONSE 0x45
64#define PMBUS_IOUT_OC_FAULT_LIMIT 0x46
65#define PMBUS_IOUT_OC_FAULT_RESPONSE 0x47
66#define PMBUS_IOUT_OC_LV_FAULT_LIMIT 0x48
67#define PMBUS_IOUT_OC_LV_FAULT_RESPONSE 0x49
68#define PMBUS_IOUT_OC_WARN_LIMIT 0x4A
69#define PMBUS_IOUT_UC_FAULT_LIMIT 0x4B
70#define PMBUS_IOUT_UC_FAULT_RESPONSE 0x4C
71
72#define PMBUS_OT_FAULT_LIMIT 0x4F
73#define PMBUS_OT_FAULT_RESPONSE 0x50
74#define PMBUS_OT_WARN_LIMIT 0x51
75#define PMBUS_UT_WARN_LIMIT 0x52
76#define PMBUS_UT_FAULT_LIMIT 0x53
77#define PMBUS_UT_FAULT_RESPONSE 0x54
78#define PMBUS_VIN_OV_FAULT_LIMIT 0x55
79#define PMBUS_VIN_OV_FAULT_RESPONSE 0x56
80#define PMBUS_VIN_OV_WARN_LIMIT 0x57
81#define PMBUS_VIN_UV_WARN_LIMIT 0x58
82#define PMBUS_VIN_UV_FAULT_LIMIT 0x59
83
84#define PMBUS_IIN_OC_FAULT_LIMIT 0x5B
85#define PMBUS_IIN_OC_WARN_LIMIT 0x5D
86
87#define PMBUS_POUT_OP_FAULT_LIMIT 0x68
88#define PMBUS_POUT_OP_WARN_LIMIT 0x6A
89#define PMBUS_PIN_OP_WARN_LIMIT 0x6B
90
91#define PMBUS_STATUS_BYTE 0x78
92#define PMBUS_STATUS_WORD 0x79
93#define PMBUS_STATUS_VOUT 0x7A
94#define PMBUS_STATUS_IOUT 0x7B
95#define PMBUS_STATUS_INPUT 0x7C
96#define PMBUS_STATUS_TEMPERATURE 0x7D
97#define PMBUS_STATUS_CML 0x7E
98#define PMBUS_STATUS_OTHER 0x7F
99#define PMBUS_STATUS_MFR_SPECIFIC 0x80
100#define PMBUS_STATUS_FAN_12 0x81
101#define PMBUS_STATUS_FAN_34 0x82
102
103#define PMBUS_READ_VIN 0x88
104#define PMBUS_READ_IIN 0x89
105#define PMBUS_READ_VCAP 0x8A
106#define PMBUS_READ_VOUT 0x8B
107#define PMBUS_READ_IOUT 0x8C
108#define PMBUS_READ_TEMPERATURE_1 0x8D
109#define PMBUS_READ_TEMPERATURE_2 0x8E
110#define PMBUS_READ_TEMPERATURE_3 0x8F
111#define PMBUS_READ_FAN_SPEED_1 0x90
112#define PMBUS_READ_FAN_SPEED_2 0x91
113#define PMBUS_READ_FAN_SPEED_3 0x92
114#define PMBUS_READ_FAN_SPEED_4 0x93
115#define PMBUS_READ_DUTY_CYCLE 0x94
116#define PMBUS_READ_FREQUENCY 0x95
117#define PMBUS_READ_POUT 0x96
118#define PMBUS_READ_PIN 0x97
119
120#define PMBUS_REVISION 0x98
121#define PMBUS_MFR_ID 0x99
122#define PMBUS_MFR_MODEL 0x9A
123#define PMBUS_MFR_REVISION 0x9B
124#define PMBUS_MFR_LOCATION 0x9C
125#define PMBUS_MFR_DATE 0x9D
126#define PMBUS_MFR_SERIAL 0x9E
127
128/*
129 * CAPABILITY
130 */
131#define PB_CAPABILITY_SMBALERT (1<<4)
132#define PB_CAPABILITY_ERROR_CHECK (1<<7)
133
134/*
135 * VOUT_MODE
136 */
137#define PB_VOUT_MODE_MODE_MASK 0xe0
138#define PB_VOUT_MODE_PARAM_MASK 0x1f
139
140#define PB_VOUT_MODE_LINEAR 0x00
141#define PB_VOUT_MODE_VID 0x20
142#define PB_VOUT_MODE_DIRECT 0x40
143
144/*
145 * Fan configuration
146 */
147#define PB_FAN_2_PULSE_MASK ((1 << 0) | (1 << 1))
148#define PB_FAN_2_RPM (1 << 2)
149#define PB_FAN_2_INSTALLED (1 << 3)
150#define PB_FAN_1_PULSE_MASK ((1 << 4) | (1 << 5))
151#define PB_FAN_1_RPM (1 << 6)
152#define PB_FAN_1_INSTALLED (1 << 7)
153
154/*
155 * STATUS_BYTE, STATUS_WORD (lower)
156 */
157#define PB_STATUS_NONE_ABOVE (1<<0)
158#define PB_STATUS_CML (1<<1)
159#define PB_STATUS_TEMPERATURE (1<<2)
160#define PB_STATUS_VIN_UV (1<<3)
161#define PB_STATUS_IOUT_OC (1<<4)
162#define PB_STATUS_VOUT_OV (1<<5)
163#define PB_STATUS_OFF (1<<6)
164#define PB_STATUS_BUSY (1<<7)
165
166/*
167 * STATUS_WORD (upper)
168 */
169#define PB_STATUS_UNKNOWN (1<<8)
170#define PB_STATUS_OTHER (1<<9)
171#define PB_STATUS_FANS (1<<10)
172#define PB_STATUS_POWER_GOOD_N (1<<11)
173#define PB_STATUS_WORD_MFR (1<<12)
174#define PB_STATUS_INPUT (1<<13)
175#define PB_STATUS_IOUT_POUT (1<<14)
176#define PB_STATUS_VOUT (1<<15)
177
178/*
179 * STATUS_IOUT
180 */
181#define PB_POUT_OP_WARNING (1<<0)
182#define PB_POUT_OP_FAULT (1<<1)
183#define PB_POWER_LIMITING (1<<2)
184#define PB_CURRENT_SHARE_FAULT (1<<3)
185#define PB_IOUT_UC_FAULT (1<<4)
186#define PB_IOUT_OC_WARNING (1<<5)
187#define PB_IOUT_OC_LV_FAULT (1<<6)
188#define PB_IOUT_OC_FAULT (1<<7)
189
190/*
191 * STATUS_VOUT, STATUS_INPUT
192 */
193#define PB_VOLTAGE_UV_FAULT (1<<4)
194#define PB_VOLTAGE_UV_WARNING (1<<5)
195#define PB_VOLTAGE_OV_WARNING (1<<6)
196#define PB_VOLTAGE_OV_FAULT (1<<7)
197
198/*
199 * STATUS_INPUT
200 */
201#define PB_PIN_OP_WARNING (1<<0)
202#define PB_IIN_OC_WARNING (1<<1)
203#define PB_IIN_OC_FAULT (1<<2)
204
205/*
206 * STATUS_TEMPERATURE
207 */
208#define PB_TEMP_UT_FAULT (1<<4)
209#define PB_TEMP_UT_WARNING (1<<5)
210#define PB_TEMP_OT_WARNING (1<<6)
211#define PB_TEMP_OT_FAULT (1<<7)
212
213/*
214 * STATUS_FAN
215 */
216#define PB_FAN_AIRFLOW_WARNING (1<<0)
217#define PB_FAN_AIRFLOW_FAULT (1<<1)
218#define PB_FAN_FAN2_SPEED_OVERRIDE (1<<2)
219#define PB_FAN_FAN1_SPEED_OVERRIDE (1<<3)
220#define PB_FAN_FAN2_WARNING (1<<4)
221#define PB_FAN_FAN1_WARNING (1<<5)
222#define PB_FAN_FAN2_FAULT (1<<6)
223#define PB_FAN_FAN1_FAULT (1<<7)
224
225/*
226 * CML_FAULT_STATUS
227 */
228#define PB_CML_FAULT_OTHER_MEM_LOGIC (1<<0)
229#define PB_CML_FAULT_OTHER_COMM (1<<1)
230#define PB_CML_FAULT_PROCESSOR (1<<3)
231#define PB_CML_FAULT_MEMORY (1<<4)
232#define PB_CML_FAULT_PACKET_ERROR (1<<5)
233#define PB_CML_FAULT_INVALID_DATA (1<<6)
234#define PB_CML_FAULT_INVALID_COMMAND (1<<7)
235
236enum pmbus_sensor_classes {
237 PSC_VOLTAGE_IN = 0,
238 PSC_VOLTAGE_OUT,
239 PSC_CURRENT_IN,
240 PSC_CURRENT_OUT,
241 PSC_POWER,
242 PSC_TEMPERATURE,
243 PSC_FAN,
244 PSC_NUM_CLASSES /* Number of power sensor classes */
245};
246
247#define PMBUS_PAGES 32 /* Per PMBus specification */
248
249/* Functionality bit mask */
250#define PMBUS_HAVE_VIN (1 << 0)
251#define PMBUS_HAVE_VCAP (1 << 1)
252#define PMBUS_HAVE_VOUT (1 << 2)
253#define PMBUS_HAVE_IIN (1 << 3)
254#define PMBUS_HAVE_IOUT (1 << 4)
255#define PMBUS_HAVE_PIN (1 << 5)
256#define PMBUS_HAVE_POUT (1 << 6)
257#define PMBUS_HAVE_FAN12 (1 << 7)
258#define PMBUS_HAVE_FAN34 (1 << 8)
259#define PMBUS_HAVE_TEMP (1 << 9)
260#define PMBUS_HAVE_TEMP2 (1 << 10)
261#define PMBUS_HAVE_TEMP3 (1 << 11)
262#define PMBUS_HAVE_STATUS_VOUT (1 << 12)
263#define PMBUS_HAVE_STATUS_IOUT (1 << 13)
264#define PMBUS_HAVE_STATUS_INPUT (1 << 14)
265#define PMBUS_HAVE_STATUS_TEMP (1 << 15)
266#define PMBUS_HAVE_STATUS_FAN12 (1 << 16)
267#define PMBUS_HAVE_STATUS_FAN34 (1 << 17)
268
269struct pmbus_driver_info {
270 int pages; /* Total number of pages */
271 bool direct[PSC_NUM_CLASSES];
272 /* true if device uses direct data format
273 for the given sensor class */
274 /*
275 * Support one set of coefficients for each sensor type
276 * Used for chips providing data in direct mode.
277 */
278 int m[PSC_NUM_CLASSES]; /* mantissa for direct data format */
279 int b[PSC_NUM_CLASSES]; /* offset */
280 int R[PSC_NUM_CLASSES]; /* exponent */
281
282 u32 func[PMBUS_PAGES]; /* Functionality, per page */
283 /*
284 * The get_status function maps manufacturing specific status values
285 * into PMBus standard status values.
286 * This function is optional and only necessary if chip specific status
287 * register values have to be mapped into standard PMBus status register
288 * values.
289 */
290 int (*get_status)(struct i2c_client *client, int page, int reg);
291 /*
292 * The identify function determines supported PMBus functionality.
293 * This function is only necessary if a chip driver supports multiple
294 * chips, and the chip functionality is not pre-determined.
295 */
296 int (*identify)(struct i2c_client *client,
297 struct pmbus_driver_info *info);
298};
299
300/* Function declarations */
301
302int pmbus_set_page(struct i2c_client *client, u8 page);
303int pmbus_read_word_data(struct i2c_client *client, u8 page, u8 reg);
304void pmbus_clear_faults(struct i2c_client *client);
305bool pmbus_check_byte_register(struct i2c_client *client, int page, int reg);
306bool pmbus_check_word_register(struct i2c_client *client, int page, int reg);
307int pmbus_do_probe(struct i2c_client *client, const struct i2c_device_id *id,
308 struct pmbus_driver_info *info);
309int pmbus_do_remove(struct i2c_client *client);
310const struct pmbus_driver_info *pmbus_get_driver_info(struct i2c_client
311 *client);
312
313#endif /* PMBUS_H */
diff --git a/drivers/hwmon/pmbus_core.c b/drivers/hwmon/pmbus_core.c
new file mode 100644
index 000000000000..0edab1c9553e
--- /dev/null
+++ b/drivers/hwmon/pmbus_core.c
@@ -0,0 +1,1628 @@
1/*
2 * Hardware monitoring driver for PMBus devices
3 *
4 * Copyright (c) 2010, 2011 Ericsson AB.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 */
20
21#include <linux/kernel.h>
22#include <linux/module.h>
23#include <linux/init.h>
24#include <linux/err.h>
25#include <linux/slab.h>
26#include <linux/i2c.h>
27#include <linux/hwmon.h>
28#include <linux/hwmon-sysfs.h>
29#include <linux/delay.h>
30#include <linux/i2c/pmbus.h>
31#include "pmbus.h"
32
33/*
34 * Constants needed to determine number of sensors, booleans, and labels.
35 */
36#define PMBUS_MAX_INPUT_SENSORS 11 /* 6*volt, 3*curr, 2*power */
37#define PMBUS_VOUT_SENSORS_PER_PAGE 5 /* input, min, max, lcrit,
38 crit */
39#define PMBUS_IOUT_SENSORS_PER_PAGE 4 /* input, min, max, crit */
40#define PMBUS_POUT_SENSORS_PER_PAGE 4 /* input, cap, max, crit */
41#define PMBUS_MAX_SENSORS_PER_FAN 1 /* input */
42#define PMBUS_MAX_SENSORS_PER_TEMP 5 /* input, min, max, lcrit,
43 crit */
44
45#define PMBUS_MAX_INPUT_BOOLEANS 7 /* v: min_alarm, max_alarm,
46 lcrit_alarm, crit_alarm;
47 c: alarm, crit_alarm;
48 p: crit_alarm */
49#define PMBUS_VOUT_BOOLEANS_PER_PAGE 4 /* min_alarm, max_alarm,
50 lcrit_alarm, crit_alarm */
51#define PMBUS_IOUT_BOOLEANS_PER_PAGE 3 /* alarm, lcrit_alarm,
52 crit_alarm */
53#define PMBUS_POUT_BOOLEANS_PER_PAGE 2 /* alarm, crit_alarm */
54#define PMBUS_MAX_BOOLEANS_PER_FAN 2 /* alarm, fault */
55#define PMBUS_MAX_BOOLEANS_PER_TEMP 4 /* min_alarm, max_alarm,
56 lcrit_alarm, crit_alarm */
57
58#define PMBUS_MAX_INPUT_LABELS 4 /* vin, vcap, iin, pin */
59
60/*
61 * status, status_vout, status_iout, status_fans, and status_temp
62 * are paged. status_input and status_fan34 are unpaged.
63 * status_fan34 is a special case to handle a second set of fans
64 * on page 0.
65 */
66#define PB_NUM_STATUS_REG (PMBUS_PAGES * 5 + 2)
67
68/*
69 * Index into status register array, per status register group
70 */
71#define PB_STATUS_BASE 0
72#define PB_STATUS_VOUT_BASE (PB_STATUS_BASE + PMBUS_PAGES)
73#define PB_STATUS_IOUT_BASE (PB_STATUS_VOUT_BASE + PMBUS_PAGES)
74#define PB_STATUS_FAN_BASE (PB_STATUS_IOUT_BASE + PMBUS_PAGES)
75#define PB_STATUS_FAN34_BASE (PB_STATUS_FAN_BASE + PMBUS_PAGES)
76#define PB_STATUS_INPUT_BASE (PB_STATUS_FAN34_BASE + 1)
77#define PB_STATUS_TEMP_BASE (PB_STATUS_INPUT_BASE + 1)
78
79struct pmbus_sensor {
80 char name[I2C_NAME_SIZE]; /* sysfs sensor name */
81 struct sensor_device_attribute attribute;
82 u8 page; /* page number */
83 u8 reg; /* register */
84 enum pmbus_sensor_classes class; /* sensor class */
85 bool update; /* runtime sensor update needed */
86 int data; /* Sensor data.
87 Negative if there was a read error */
88};
89
90struct pmbus_boolean {
91 char name[I2C_NAME_SIZE]; /* sysfs boolean name */
92 struct sensor_device_attribute attribute;
93};
94
95struct pmbus_label {
96 char name[I2C_NAME_SIZE]; /* sysfs label name */
97 struct sensor_device_attribute attribute;
98 char label[I2C_NAME_SIZE]; /* label */
99};
100
101struct pmbus_data {
102 struct device *hwmon_dev;
103
104 u32 flags; /* from platform data */
105
106 int exponent; /* linear mode: exponent for output voltages */
107
108 const struct pmbus_driver_info *info;
109
110 int max_attributes;
111 int num_attributes;
112 struct attribute **attributes;
113 struct attribute_group group;
114
115 /*
116 * Sensors cover both sensor and limit registers.
117 */
118 int max_sensors;
119 int num_sensors;
120 struct pmbus_sensor *sensors;
121 /*
122 * Booleans are used for alarms.
123 * Values are determined from status registers.
124 */
125 int max_booleans;
126 int num_booleans;
127 struct pmbus_boolean *booleans;
128 /*
129 * Labels are used to map generic names (e.g., "in1")
130 * to PMBus specific names (e.g., "vin" or "vout1").
131 */
132 int max_labels;
133 int num_labels;
134 struct pmbus_label *labels;
135
136 struct mutex update_lock;
137 bool valid;
138 unsigned long last_updated; /* in jiffies */
139
140 /*
141 * A single status register covers multiple attributes,
142 * so we keep them all together.
143 */
144 u8 status_bits;
145 u8 status[PB_NUM_STATUS_REG];
146
147 u8 currpage;
148};
149
150int pmbus_set_page(struct i2c_client *client, u8 page)
151{
152 struct pmbus_data *data = i2c_get_clientdata(client);
153 int rv = 0;
154 int newpage;
155
156 if (page != data->currpage) {
157 rv = i2c_smbus_write_byte_data(client, PMBUS_PAGE, page);
158 newpage = i2c_smbus_read_byte_data(client, PMBUS_PAGE);
159 if (newpage != page)
160 rv = -EINVAL;
161 else
162 data->currpage = page;
163 }
164 return rv;
165}
166EXPORT_SYMBOL_GPL(pmbus_set_page);
167
168static int pmbus_write_byte(struct i2c_client *client, u8 page, u8 value)
169{
170 int rv;
171
172 rv = pmbus_set_page(client, page);
173 if (rv < 0)
174 return rv;
175
176 return i2c_smbus_write_byte(client, value);
177}
178
179static int pmbus_write_word_data(struct i2c_client *client, u8 page, u8 reg,
180 u16 word)
181{
182 int rv;
183
184 rv = pmbus_set_page(client, page);
185 if (rv < 0)
186 return rv;
187
188 return i2c_smbus_write_word_data(client, reg, word);
189}
190
191int pmbus_read_word_data(struct i2c_client *client, u8 page, u8 reg)
192{
193 int rv;
194
195 rv = pmbus_set_page(client, page);
196 if (rv < 0)
197 return rv;
198
199 return i2c_smbus_read_word_data(client, reg);
200}
201EXPORT_SYMBOL_GPL(pmbus_read_word_data);
202
203static int pmbus_read_byte_data(struct i2c_client *client, u8 page, u8 reg)
204{
205 int rv;
206
207 rv = pmbus_set_page(client, page);
208 if (rv < 0)
209 return rv;
210
211 return i2c_smbus_read_byte_data(client, reg);
212}
213
214static void pmbus_clear_fault_page(struct i2c_client *client, int page)
215{
216 pmbus_write_byte(client, page, PMBUS_CLEAR_FAULTS);
217}
218
219void pmbus_clear_faults(struct i2c_client *client)
220{
221 struct pmbus_data *data = i2c_get_clientdata(client);
222 int i;
223
224 for (i = 0; i < data->info->pages; i++)
225 pmbus_clear_fault_page(client, i);
226}
227EXPORT_SYMBOL_GPL(pmbus_clear_faults);
228
229static int pmbus_check_status_cml(struct i2c_client *client, int page)
230{
231 int status, status2;
232
233 status = pmbus_read_byte_data(client, page, PMBUS_STATUS_BYTE);
234 if (status < 0 || (status & PB_STATUS_CML)) {
235 status2 = pmbus_read_byte_data(client, page, PMBUS_STATUS_CML);
236 if (status2 < 0 || (status2 & PB_CML_FAULT_INVALID_COMMAND))
237 return -EINVAL;
238 }
239 return 0;
240}
241
242bool pmbus_check_byte_register(struct i2c_client *client, int page, int reg)
243{
244 int rv;
245 struct pmbus_data *data = i2c_get_clientdata(client);
246
247 rv = pmbus_read_byte_data(client, page, reg);
248 if (rv >= 0 && !(data->flags & PMBUS_SKIP_STATUS_CHECK))
249 rv = pmbus_check_status_cml(client, page);
250 pmbus_clear_fault_page(client, page);
251 return rv >= 0;
252}
253EXPORT_SYMBOL_GPL(pmbus_check_byte_register);
254
255bool pmbus_check_word_register(struct i2c_client *client, int page, int reg)
256{
257 int rv;
258 struct pmbus_data *data = i2c_get_clientdata(client);
259
260 rv = pmbus_read_word_data(client, page, reg);
261 if (rv >= 0 && !(data->flags & PMBUS_SKIP_STATUS_CHECK))
262 rv = pmbus_check_status_cml(client, page);
263 pmbus_clear_fault_page(client, page);
264 return rv >= 0;
265}
266EXPORT_SYMBOL_GPL(pmbus_check_word_register);
267
268const struct pmbus_driver_info *pmbus_get_driver_info(struct i2c_client *client)
269{
270 struct pmbus_data *data = i2c_get_clientdata(client);
271
272 return data->info;
273}
274EXPORT_SYMBOL_GPL(pmbus_get_driver_info);
275
276static int pmbus_get_status(struct i2c_client *client, int page, int reg)
277{
278 struct pmbus_data *data = i2c_get_clientdata(client);
279 const struct pmbus_driver_info *info = data->info;
280 int status;
281
282 if (info->get_status) {
283 status = info->get_status(client, page, reg);
284 if (status != -ENODATA)
285 return status;
286 }
287 return pmbus_read_byte_data(client, page, reg);
288}
289
290static struct pmbus_data *pmbus_update_device(struct device *dev)
291{
292 struct i2c_client *client = to_i2c_client(dev);
293 struct pmbus_data *data = i2c_get_clientdata(client);
294 const struct pmbus_driver_info *info = data->info;
295
296 mutex_lock(&data->update_lock);
297 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
298 int i;
299
300 for (i = 0; i < info->pages; i++)
301 data->status[PB_STATUS_BASE + i]
302 = pmbus_read_byte_data(client, i,
303 PMBUS_STATUS_BYTE);
304 for (i = 0; i < info->pages; i++) {
305 if (!(info->func[i] & PMBUS_HAVE_STATUS_VOUT))
306 continue;
307 data->status[PB_STATUS_VOUT_BASE + i]
308 = pmbus_get_status(client, i, PMBUS_STATUS_VOUT);
309 }
310 for (i = 0; i < info->pages; i++) {
311 if (!(info->func[i] & PMBUS_HAVE_STATUS_IOUT))
312 continue;
313 data->status[PB_STATUS_IOUT_BASE + i]
314 = pmbus_get_status(client, i, PMBUS_STATUS_IOUT);
315 }
316 for (i = 0; i < info->pages; i++) {
317 if (!(info->func[i] & PMBUS_HAVE_STATUS_TEMP))
318 continue;
319 data->status[PB_STATUS_TEMP_BASE + i]
320 = pmbus_get_status(client, i,
321 PMBUS_STATUS_TEMPERATURE);
322 }
323 for (i = 0; i < info->pages; i++) {
324 if (!(info->func[i] & PMBUS_HAVE_STATUS_FAN12))
325 continue;
326 data->status[PB_STATUS_FAN_BASE + i]
327 = pmbus_get_status(client, i, PMBUS_STATUS_FAN_12);
328 }
329
330 if (info->func[0] & PMBUS_HAVE_STATUS_INPUT)
331 data->status[PB_STATUS_INPUT_BASE]
332 = pmbus_get_status(client, 0, PMBUS_STATUS_INPUT);
333
334 if (info->func[0] & PMBUS_HAVE_STATUS_FAN34)
335 data->status[PB_STATUS_FAN34_BASE]
336 = pmbus_get_status(client, 0, PMBUS_STATUS_FAN_34);
337
338 for (i = 0; i < data->num_sensors; i++) {
339 struct pmbus_sensor *sensor = &data->sensors[i];
340
341 if (!data->valid || sensor->update)
342 sensor->data
343 = pmbus_read_word_data(client, sensor->page,
344 sensor->reg);
345 }
346 pmbus_clear_faults(client);
347 data->last_updated = jiffies;
348 data->valid = 1;
349 }
350 mutex_unlock(&data->update_lock);
351 return data;
352}
353
354/*
355 * Convert linear sensor values to milli- or micro-units
356 * depending on sensor type.
357 */
358static int pmbus_reg2data_linear(struct pmbus_data *data,
359 struct pmbus_sensor *sensor)
360{
361 s16 exponent, mantissa;
362 long val;
363
364 if (sensor->class == PSC_VOLTAGE_OUT) {
365 exponent = data->exponent;
366 mantissa = (s16) sensor->data;
367 } else {
368 exponent = (sensor->data >> 11) & 0x001f;
369 mantissa = sensor->data & 0x07ff;
370
371 if (exponent > 0x0f)
372 exponent |= 0xffe0; /* sign extend exponent */
373 if (mantissa > 0x03ff)
374 mantissa |= 0xf800; /* sign extend mantissa */
375 }
376
377 val = mantissa;
378
379 /* scale result to milli-units for all sensors except fans */
380 if (sensor->class != PSC_FAN)
381 val = val * 1000L;
382
383 /* scale result to micro-units for power sensors */
384 if (sensor->class == PSC_POWER)
385 val = val * 1000L;
386
387 if (exponent >= 0)
388 val <<= exponent;
389 else
390 val >>= -exponent;
391
392 return (int)val;
393}
394
395/*
396 * Convert direct sensor values to milli- or micro-units
397 * depending on sensor type.
398 */
399static int pmbus_reg2data_direct(struct pmbus_data *data,
400 struct pmbus_sensor *sensor)
401{
402 long val = (s16) sensor->data;
403 long m, b, R;
404
405 m = data->info->m[sensor->class];
406 b = data->info->b[sensor->class];
407 R = data->info->R[sensor->class];
408
409 if (m == 0)
410 return 0;
411
412 /* X = 1/m * (Y * 10^-R - b) */
413 R = -R;
414 /* scale result to milli-units for everything but fans */
415 if (sensor->class != PSC_FAN) {
416 R += 3;
417 b *= 1000;
418 }
419
420 /* scale result to micro-units for power sensors */
421 if (sensor->class == PSC_POWER) {
422 R += 3;
423 b *= 1000;
424 }
425
426 while (R > 0) {
427 val *= 10;
428 R--;
429 }
430 while (R < 0) {
431 val = DIV_ROUND_CLOSEST(val, 10);
432 R++;
433 }
434
435 return (int)((val - b) / m);
436}
437
438static int pmbus_reg2data(struct pmbus_data *data, struct pmbus_sensor *sensor)
439{
440 int val;
441
442 if (data->info->direct[sensor->class])
443 val = pmbus_reg2data_direct(data, sensor);
444 else
445 val = pmbus_reg2data_linear(data, sensor);
446
447 return val;
448}
449
450#define MAX_MANTISSA (1023 * 1000)
451#define MIN_MANTISSA (511 * 1000)
452
453static u16 pmbus_data2reg_linear(struct pmbus_data *data,
454 enum pmbus_sensor_classes class, long val)
455{
456 s16 exponent = 0, mantissa = 0;
457 bool negative = false;
458
459 /* simple case */
460 if (val == 0)
461 return 0;
462
463 if (val < 0) {
464 negative = true;
465 val = -val;
466 }
467
468 if (class == PSC_VOLTAGE_OUT) {
469 /*
470 * For a static exponents, we don't have a choice
471 * but to adjust the value to it.
472 */
473 if (data->exponent < 0)
474 val <<= -data->exponent;
475 else
476 val >>= data->exponent;
477 val = DIV_ROUND_CLOSEST(val, 1000);
478 if (val > 0x7fff)
479 val = 0x7fff;
480 return negative ? -val : val;
481 }
482
483 /* Power is in uW. Convert to mW before converting. */
484 if (class == PSC_POWER)
485 val = DIV_ROUND_CLOSEST(val, 1000L);
486
487 /*
488 * For simplicity, convert fan data to milli-units
489 * before calculating the exponent.
490 */
491 if (class == PSC_FAN)
492 val = val * 1000;
493
494 /* Reduce large mantissa until it fits into 10 bit */
495 while (val >= MAX_MANTISSA && exponent < 15) {
496 exponent++;
497 val >>= 1;
498 }
499 /* Increase small mantissa to improve precision */
500 while (val < MIN_MANTISSA && exponent > -15) {
501 exponent--;
502 val <<= 1;
503 }
504
505 /* Convert mantissa from milli-units to units */
506 mantissa = DIV_ROUND_CLOSEST(val, 1000);
507
508 /* Ensure that resulting number is within range */
509 if (mantissa > 0x3ff)
510 mantissa = 0x3ff;
511
512 /* restore sign */
513 if (negative)
514 mantissa = -mantissa;
515
516 /* Convert to 5 bit exponent, 11 bit mantissa */
517 return (mantissa & 0x7ff) | ((exponent << 11) & 0xf800);
518}
519
520static u16 pmbus_data2reg_direct(struct pmbus_data *data,
521 enum pmbus_sensor_classes class, long val)
522{
523 long m, b, R;
524
525 m = data->info->m[class];
526 b = data->info->b[class];
527 R = data->info->R[class];
528
529 /* Power is in uW. Adjust R and b. */
530 if (class == PSC_POWER) {
531 R -= 3;
532 b *= 1000;
533 }
534
535 /* Calculate Y = (m * X + b) * 10^R */
536 if (class != PSC_FAN) {
537 R -= 3; /* Adjust R and b for data in milli-units */
538 b *= 1000;
539 }
540 val = val * m + b;
541
542 while (R > 0) {
543 val *= 10;
544 R--;
545 }
546 while (R < 0) {
547 val = DIV_ROUND_CLOSEST(val, 10);
548 R++;
549 }
550
551 return val;
552}
553
554static u16 pmbus_data2reg(struct pmbus_data *data,
555 enum pmbus_sensor_classes class, long val)
556{
557 u16 regval;
558
559 if (data->info->direct[class])
560 regval = pmbus_data2reg_direct(data, class, val);
561 else
562 regval = pmbus_data2reg_linear(data, class, val);
563
564 return regval;
565}
566
567/*
568 * Return boolean calculated from converted data.
569 * <index> defines a status register index and mask, and optionally
570 * two sensor indexes.
571 * The upper half-word references the two sensors,
572 * two sensor indices.
573 * The upper half-word references the two optional sensors,
574 * the lower half word references status register and mask.
575 * The function returns true if (status[reg] & mask) is true and,
576 * if specified, if v1 >= v2.
577 * To determine if an object exceeds upper limits, specify <v, limit>.
578 * To determine if an object exceeds lower limits, specify <limit, v>.
579 *
580 * For booleans created with pmbus_add_boolean_reg(), only the lower 16 bits of
581 * index are set. s1 and s2 (the sensor index values) are zero in this case.
582 * The function returns true if (status[reg] & mask) is true.
583 *
584 * If the boolean was created with pmbus_add_boolean_cmp(), a comparison against
585 * a specified limit has to be performed to determine the boolean result.
586 * In this case, the function returns true if v1 >= v2 (where v1 and v2 are
587 * sensor values referenced by sensor indices s1 and s2).
588 *
589 * To determine if an object exceeds upper limits, specify <s1,s2> = <v,limit>.
590 * To determine if an object exceeds lower limits, specify <s1,s2> = <limit,v>.
591 *
592 * If a negative value is stored in any of the referenced registers, this value
593 * reflects an error code which will be returned.
594 */
595static int pmbus_get_boolean(struct pmbus_data *data, int index, int *val)
596{
597 u8 s1 = (index >> 24) & 0xff;
598 u8 s2 = (index >> 16) & 0xff;
599 u8 reg = (index >> 8) & 0xff;
600 u8 mask = index & 0xff;
601 int status;
602 u8 regval;
603
604 status = data->status[reg];
605 if (status < 0)
606 return status;
607
608 regval = status & mask;
609 if (!s1 && !s2)
610 *val = !!regval;
611 else {
612 int v1, v2;
613 struct pmbus_sensor *sensor1, *sensor2;
614
615 sensor1 = &data->sensors[s1];
616 if (sensor1->data < 0)
617 return sensor1->data;
618 sensor2 = &data->sensors[s2];
619 if (sensor2->data < 0)
620 return sensor2->data;
621
622 v1 = pmbus_reg2data(data, sensor1);
623 v2 = pmbus_reg2data(data, sensor2);
624 *val = !!(regval && v1 >= v2);
625 }
626 return 0;
627}
628
629static ssize_t pmbus_show_boolean(struct device *dev,
630 struct device_attribute *da, char *buf)
631{
632 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
633 struct pmbus_data *data = pmbus_update_device(dev);
634 int val;
635 int err;
636
637 err = pmbus_get_boolean(data, attr->index, &val);
638 if (err)
639 return err;
640 return snprintf(buf, PAGE_SIZE, "%d\n", val);
641}
642
643static ssize_t pmbus_show_sensor(struct device *dev,
644 struct device_attribute *da, char *buf)
645{
646 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
647 struct pmbus_data *data = pmbus_update_device(dev);
648 struct pmbus_sensor *sensor;
649
650 sensor = &data->sensors[attr->index];
651 if (sensor->data < 0)
652 return sensor->data;
653
654 return snprintf(buf, PAGE_SIZE, "%d\n", pmbus_reg2data(data, sensor));
655}
656
657static ssize_t pmbus_set_sensor(struct device *dev,
658 struct device_attribute *devattr,
659 const char *buf, size_t count)
660{
661 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
662 struct i2c_client *client = to_i2c_client(dev);
663 struct pmbus_data *data = i2c_get_clientdata(client);
664 struct pmbus_sensor *sensor = &data->sensors[attr->index];
665 ssize_t rv = count;
666 long val = 0;
667 int ret;
668 u16 regval;
669
670 if (strict_strtol(buf, 10, &val) < 0)
671 return -EINVAL;
672
673 mutex_lock(&data->update_lock);
674 regval = pmbus_data2reg(data, sensor->class, val);
675 ret = pmbus_write_word_data(client, sensor->page, sensor->reg, regval);
676 if (ret < 0)
677 rv = ret;
678 else
679 data->sensors[attr->index].data = regval;
680 mutex_unlock(&data->update_lock);
681 return rv;
682}
683
684static ssize_t pmbus_show_label(struct device *dev,
685 struct device_attribute *da, char *buf)
686{
687 struct i2c_client *client = to_i2c_client(dev);
688 struct pmbus_data *data = i2c_get_clientdata(client);
689 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
690
691 return snprintf(buf, PAGE_SIZE, "%s\n",
692 data->labels[attr->index].label);
693}
694
695#define PMBUS_ADD_ATTR(data, _name, _idx, _mode, _type, _show, _set) \
696do { \
697 struct sensor_device_attribute *a \
698 = &data->_type##s[data->num_##_type##s].attribute; \
699 BUG_ON(data->num_attributes >= data->max_attributes); \
700 a->dev_attr.attr.name = _name; \
701 a->dev_attr.attr.mode = _mode; \
702 a->dev_attr.show = _show; \
703 a->dev_attr.store = _set; \
704 a->index = _idx; \
705 data->attributes[data->num_attributes] = &a->dev_attr.attr; \
706 data->num_attributes++; \
707} while (0)
708
709#define PMBUS_ADD_GET_ATTR(data, _name, _type, _idx) \
710 PMBUS_ADD_ATTR(data, _name, _idx, S_IRUGO, _type, \
711 pmbus_show_##_type, NULL)
712
713#define PMBUS_ADD_SET_ATTR(data, _name, _type, _idx) \
714 PMBUS_ADD_ATTR(data, _name, _idx, S_IWUSR | S_IRUGO, _type, \
715 pmbus_show_##_type, pmbus_set_##_type)
716
717static void pmbus_add_boolean(struct pmbus_data *data,
718 const char *name, const char *type, int seq,
719 int idx)
720{
721 struct pmbus_boolean *boolean;
722
723 BUG_ON(data->num_booleans >= data->max_booleans);
724
725 boolean = &data->booleans[data->num_booleans];
726
727 snprintf(boolean->name, sizeof(boolean->name), "%s%d_%s",
728 name, seq, type);
729 PMBUS_ADD_GET_ATTR(data, boolean->name, boolean, idx);
730 data->num_booleans++;
731}
732
733static void pmbus_add_boolean_reg(struct pmbus_data *data,
734 const char *name, const char *type,
735 int seq, int reg, int bit)
736{
737 pmbus_add_boolean(data, name, type, seq, (reg << 8) | bit);
738}
739
740static void pmbus_add_boolean_cmp(struct pmbus_data *data,
741 const char *name, const char *type,
742 int seq, int i1, int i2, int reg, int mask)
743{
744 pmbus_add_boolean(data, name, type, seq,
745 (i1 << 24) | (i2 << 16) | (reg << 8) | mask);
746}
747
748static void pmbus_add_sensor(struct pmbus_data *data,
749 const char *name, const char *type, int seq,
750 int page, int reg, enum pmbus_sensor_classes class,
751 bool update)
752{
753 struct pmbus_sensor *sensor;
754
755 BUG_ON(data->num_sensors >= data->max_sensors);
756
757 sensor = &data->sensors[data->num_sensors];
758 snprintf(sensor->name, sizeof(sensor->name), "%s%d_%s",
759 name, seq, type);
760 sensor->page = page;
761 sensor->reg = reg;
762 sensor->class = class;
763 sensor->update = update;
764 if (update)
765 PMBUS_ADD_GET_ATTR(data, sensor->name, sensor,
766 data->num_sensors);
767 else
768 PMBUS_ADD_SET_ATTR(data, sensor->name, sensor,
769 data->num_sensors);
770 data->num_sensors++;
771}
772
773static void pmbus_add_label(struct pmbus_data *data,
774 const char *name, int seq,
775 const char *lstring, int index)
776{
777 struct pmbus_label *label;
778
779 BUG_ON(data->num_labels >= data->max_labels);
780
781 label = &data->labels[data->num_labels];
782 snprintf(label->name, sizeof(label->name), "%s%d_label", name, seq);
783 if (!index)
784 strncpy(label->label, lstring, sizeof(label->label) - 1);
785 else
786 snprintf(label->label, sizeof(label->label), "%s%d", lstring,
787 index);
788
789 PMBUS_ADD_GET_ATTR(data, label->name, label, data->num_labels);
790 data->num_labels++;
791}
792
793static const int pmbus_temp_registers[] = {
794 PMBUS_READ_TEMPERATURE_1,
795 PMBUS_READ_TEMPERATURE_2,
796 PMBUS_READ_TEMPERATURE_3
797};
798
799static const int pmbus_fan_registers[] = {
800 PMBUS_READ_FAN_SPEED_1,
801 PMBUS_READ_FAN_SPEED_2,
802 PMBUS_READ_FAN_SPEED_3,
803 PMBUS_READ_FAN_SPEED_4
804};
805
806static const int pmbus_fan_config_registers[] = {
807 PMBUS_FAN_CONFIG_12,
808 PMBUS_FAN_CONFIG_12,
809 PMBUS_FAN_CONFIG_34,
810 PMBUS_FAN_CONFIG_34
811};
812
813static const int pmbus_fan_status_registers[] = {
814 PMBUS_STATUS_FAN_12,
815 PMBUS_STATUS_FAN_12,
816 PMBUS_STATUS_FAN_34,
817 PMBUS_STATUS_FAN_34
818};
819
820/*
821 * Determine maximum number of sensors, booleans, and labels.
822 * To keep things simple, only make a rough high estimate.
823 */
824static void pmbus_find_max_attr(struct i2c_client *client,
825 struct pmbus_data *data)
826{
827 const struct pmbus_driver_info *info = data->info;
828 int page, max_sensors, max_booleans, max_labels;
829
830 max_sensors = PMBUS_MAX_INPUT_SENSORS;
831 max_booleans = PMBUS_MAX_INPUT_BOOLEANS;
832 max_labels = PMBUS_MAX_INPUT_LABELS;
833
834 for (page = 0; page < info->pages; page++) {
835 if (info->func[page] & PMBUS_HAVE_VOUT) {
836 max_sensors += PMBUS_VOUT_SENSORS_PER_PAGE;
837 max_booleans += PMBUS_VOUT_BOOLEANS_PER_PAGE;
838 max_labels++;
839 }
840 if (info->func[page] & PMBUS_HAVE_IOUT) {
841 max_sensors += PMBUS_IOUT_SENSORS_PER_PAGE;
842 max_booleans += PMBUS_IOUT_BOOLEANS_PER_PAGE;
843 max_labels++;
844 }
845 if (info->func[page] & PMBUS_HAVE_POUT) {
846 max_sensors += PMBUS_POUT_SENSORS_PER_PAGE;
847 max_booleans += PMBUS_POUT_BOOLEANS_PER_PAGE;
848 max_labels++;
849 }
850 if (info->func[page] & PMBUS_HAVE_FAN12) {
851 if (page == 0) {
852 max_sensors +=
853 ARRAY_SIZE(pmbus_fan_registers) *
854 PMBUS_MAX_SENSORS_PER_FAN;
855 max_booleans +=
856 ARRAY_SIZE(pmbus_fan_registers) *
857 PMBUS_MAX_BOOLEANS_PER_FAN;
858 } else {
859 max_sensors += PMBUS_MAX_SENSORS_PER_FAN;
860 max_booleans += PMBUS_MAX_BOOLEANS_PER_FAN;
861 }
862 }
863 if (info->func[page] & PMBUS_HAVE_TEMP) {
864 if (page == 0) {
865 max_sensors +=
866 ARRAY_SIZE(pmbus_temp_registers) *
867 PMBUS_MAX_SENSORS_PER_TEMP;
868 max_booleans +=
869 ARRAY_SIZE(pmbus_temp_registers) *
870 PMBUS_MAX_BOOLEANS_PER_TEMP;
871 } else {
872 max_sensors += PMBUS_MAX_SENSORS_PER_TEMP;
873 max_booleans += PMBUS_MAX_BOOLEANS_PER_TEMP;
874 }
875 }
876 }
877 data->max_sensors = max_sensors;
878 data->max_booleans = max_booleans;
879 data->max_labels = max_labels;
880 data->max_attributes = max_sensors + max_booleans + max_labels;
881}
882
883/*
884 * Search for attributes. Allocate sensors, booleans, and labels as needed.
885 */
886static void pmbus_find_attributes(struct i2c_client *client,
887 struct pmbus_data *data)
888{
889 const struct pmbus_driver_info *info = data->info;
890 int page, i0, i1, in_index;
891
892 /*
893 * Input voltage sensors
894 */
895 in_index = 1;
896 if (info->func[0] & PMBUS_HAVE_VIN) {
897 bool have_alarm = false;
898
899 i0 = data->num_sensors;
900 pmbus_add_label(data, "in", in_index, "vin", 0);
901 pmbus_add_sensor(data, "in", "input", in_index,
902 0, PMBUS_READ_VIN, PSC_VOLTAGE_IN, true);
903 if (pmbus_check_word_register(client, 0,
904 PMBUS_VIN_UV_WARN_LIMIT)) {
905 i1 = data->num_sensors;
906 pmbus_add_sensor(data, "in", "min", in_index,
907 0, PMBUS_VIN_UV_WARN_LIMIT,
908 PSC_VOLTAGE_IN, false);
909 if (info->func[0] & PMBUS_HAVE_STATUS_INPUT) {
910 pmbus_add_boolean_reg(data, "in", "min_alarm",
911 in_index,
912 PB_STATUS_INPUT_BASE,
913 PB_VOLTAGE_UV_WARNING);
914 have_alarm = true;
915 }
916 }
917 if (pmbus_check_word_register(client, 0,
918 PMBUS_VIN_UV_FAULT_LIMIT)) {
919 i1 = data->num_sensors;
920 pmbus_add_sensor(data, "in", "lcrit", in_index,
921 0, PMBUS_VIN_UV_FAULT_LIMIT,
922 PSC_VOLTAGE_IN, false);
923 if (info->func[0] & PMBUS_HAVE_STATUS_INPUT) {
924 pmbus_add_boolean_reg(data, "in", "lcrit_alarm",
925 in_index,
926 PB_STATUS_INPUT_BASE,
927 PB_VOLTAGE_UV_FAULT);
928 have_alarm = true;
929 }
930 }
931 if (pmbus_check_word_register(client, 0,
932 PMBUS_VIN_OV_WARN_LIMIT)) {
933 i1 = data->num_sensors;
934 pmbus_add_sensor(data, "in", "max", in_index,
935 0, PMBUS_VIN_OV_WARN_LIMIT,
936 PSC_VOLTAGE_IN, false);
937 if (info->func[0] & PMBUS_HAVE_STATUS_INPUT) {
938 pmbus_add_boolean_reg(data, "in", "max_alarm",
939 in_index,
940 PB_STATUS_INPUT_BASE,
941 PB_VOLTAGE_OV_WARNING);
942 have_alarm = true;
943 }
944 }
945 if (pmbus_check_word_register(client, 0,
946 PMBUS_VIN_OV_FAULT_LIMIT)) {
947 i1 = data->num_sensors;
948 pmbus_add_sensor(data, "in", "crit", in_index,
949 0, PMBUS_VIN_OV_FAULT_LIMIT,
950 PSC_VOLTAGE_IN, false);
951 if (info->func[0] & PMBUS_HAVE_STATUS_INPUT) {
952 pmbus_add_boolean_reg(data, "in", "crit_alarm",
953 in_index,
954 PB_STATUS_INPUT_BASE,
955 PB_VOLTAGE_OV_FAULT);
956 have_alarm = true;
957 }
958 }
959 /*
960 * Add generic alarm attribute only if there are no individual
961 * attributes.
962 */
963 if (!have_alarm)
964 pmbus_add_boolean_reg(data, "in", "alarm",
965 in_index,
966 PB_STATUS_BASE,
967 PB_STATUS_VIN_UV);
968 in_index++;
969 }
970 if (info->func[0] & PMBUS_HAVE_VCAP) {
971 pmbus_add_label(data, "in", in_index, "vcap", 0);
972 pmbus_add_sensor(data, "in", "input", in_index, 0,
973 PMBUS_READ_VCAP, PSC_VOLTAGE_IN, true);
974 in_index++;
975 }
976
977 /*
978 * Output voltage sensors
979 */
980 for (page = 0; page < info->pages; page++) {
981 bool have_alarm = false;
982
983 if (!(info->func[page] & PMBUS_HAVE_VOUT))
984 continue;
985
986 i0 = data->num_sensors;
987 pmbus_add_label(data, "in", in_index, "vout", page + 1);
988 pmbus_add_sensor(data, "in", "input", in_index, page,
989 PMBUS_READ_VOUT, PSC_VOLTAGE_OUT, true);
990 if (pmbus_check_word_register(client, page,
991 PMBUS_VOUT_UV_WARN_LIMIT)) {
992 i1 = data->num_sensors;
993 pmbus_add_sensor(data, "in", "min", in_index, page,
994 PMBUS_VOUT_UV_WARN_LIMIT,
995 PSC_VOLTAGE_OUT, false);
996 if (info->func[page] & PMBUS_HAVE_STATUS_VOUT) {
997 pmbus_add_boolean_reg(data, "in", "min_alarm",
998 in_index,
999 PB_STATUS_VOUT_BASE +
1000 page,
1001 PB_VOLTAGE_UV_WARNING);
1002 have_alarm = true;
1003 }
1004 }
1005 if (pmbus_check_word_register(client, page,
1006 PMBUS_VOUT_UV_FAULT_LIMIT)) {
1007 i1 = data->num_sensors;
1008 pmbus_add_sensor(data, "in", "lcrit", in_index, page,
1009 PMBUS_VOUT_UV_FAULT_LIMIT,
1010 PSC_VOLTAGE_OUT, false);
1011 if (info->func[page] & PMBUS_HAVE_STATUS_VOUT) {
1012 pmbus_add_boolean_reg(data, "in", "lcrit_alarm",
1013 in_index,
1014 PB_STATUS_VOUT_BASE +
1015 page,
1016 PB_VOLTAGE_UV_FAULT);
1017 have_alarm = true;
1018 }
1019 }
1020 if (pmbus_check_word_register(client, page,
1021 PMBUS_VOUT_OV_WARN_LIMIT)) {
1022 i1 = data->num_sensors;
1023 pmbus_add_sensor(data, "in", "max", in_index, page,
1024 PMBUS_VOUT_OV_WARN_LIMIT,
1025 PSC_VOLTAGE_OUT, false);
1026 if (info->func[page] & PMBUS_HAVE_STATUS_VOUT) {
1027 pmbus_add_boolean_reg(data, "in", "max_alarm",
1028 in_index,
1029 PB_STATUS_VOUT_BASE +
1030 page,
1031 PB_VOLTAGE_OV_WARNING);
1032 have_alarm = true;
1033 }
1034 }
1035 if (pmbus_check_word_register(client, page,
1036 PMBUS_VOUT_OV_FAULT_LIMIT)) {
1037 i1 = data->num_sensors;
1038 pmbus_add_sensor(data, "in", "crit", in_index, page,
1039 PMBUS_VOUT_OV_FAULT_LIMIT,
1040 PSC_VOLTAGE_OUT, false);
1041 if (info->func[page] & PMBUS_HAVE_STATUS_VOUT) {
1042 pmbus_add_boolean_reg(data, "in", "crit_alarm",
1043 in_index,
1044 PB_STATUS_VOUT_BASE +
1045 page,
1046 PB_VOLTAGE_OV_FAULT);
1047 have_alarm = true;
1048 }
1049 }
1050 /*
1051 * Add generic alarm attribute only if there are no individual
1052 * attributes.
1053 */
1054 if (!have_alarm)
1055 pmbus_add_boolean_reg(data, "in", "alarm",
1056 in_index,
1057 PB_STATUS_BASE + page,
1058 PB_STATUS_VOUT_OV);
1059 in_index++;
1060 }
1061
1062 /*
1063 * Current sensors
1064 */
1065
1066 /*
1067 * Input current sensors
1068 */
1069 in_index = 1;
1070 if (info->func[0] & PMBUS_HAVE_IIN) {
1071 i0 = data->num_sensors;
1072 pmbus_add_label(data, "curr", in_index, "iin", 0);
1073 pmbus_add_sensor(data, "curr", "input", in_index,
1074 0, PMBUS_READ_IIN, PSC_CURRENT_IN, true);
1075 if (pmbus_check_word_register(client, 0,
1076 PMBUS_IIN_OC_WARN_LIMIT)) {
1077 i1 = data->num_sensors;
1078 pmbus_add_sensor(data, "curr", "max", in_index,
1079 0, PMBUS_IIN_OC_WARN_LIMIT,
1080 PSC_CURRENT_IN, false);
1081 if (info->func[0] & PMBUS_HAVE_STATUS_INPUT) {
1082 pmbus_add_boolean_reg(data, "curr", "max_alarm",
1083 in_index,
1084 PB_STATUS_INPUT_BASE,
1085 PB_IIN_OC_WARNING);
1086 }
1087 }
1088 if (pmbus_check_word_register(client, 0,
1089 PMBUS_IIN_OC_FAULT_LIMIT)) {
1090 i1 = data->num_sensors;
1091 pmbus_add_sensor(data, "curr", "crit", in_index,
1092 0, PMBUS_IIN_OC_FAULT_LIMIT,
1093 PSC_CURRENT_IN, false);
1094 if (info->func[0] & PMBUS_HAVE_STATUS_INPUT)
1095 pmbus_add_boolean_reg(data, "curr",
1096 "crit_alarm",
1097 in_index,
1098 PB_STATUS_INPUT_BASE,
1099 PB_IIN_OC_FAULT);
1100 }
1101 in_index++;
1102 }
1103
1104 /*
1105 * Output current sensors
1106 */
1107 for (page = 0; page < info->pages; page++) {
1108 bool have_alarm = false;
1109
1110 if (!(info->func[page] & PMBUS_HAVE_IOUT))
1111 continue;
1112
1113 i0 = data->num_sensors;
1114 pmbus_add_label(data, "curr", in_index, "iout", page + 1);
1115 pmbus_add_sensor(data, "curr", "input", in_index, page,
1116 PMBUS_READ_IOUT, PSC_CURRENT_OUT, true);
1117 if (pmbus_check_word_register(client, page,
1118 PMBUS_IOUT_OC_WARN_LIMIT)) {
1119 i1 = data->num_sensors;
1120 pmbus_add_sensor(data, "curr", "max", in_index, page,
1121 PMBUS_IOUT_OC_WARN_LIMIT,
1122 PSC_CURRENT_OUT, false);
1123 if (info->func[page] & PMBUS_HAVE_STATUS_IOUT) {
1124 pmbus_add_boolean_reg(data, "curr", "max_alarm",
1125 in_index,
1126 PB_STATUS_IOUT_BASE +
1127 page, PB_IOUT_OC_WARNING);
1128 have_alarm = true;
1129 }
1130 }
1131 if (pmbus_check_word_register(client, page,
1132 PMBUS_IOUT_UC_FAULT_LIMIT)) {
1133 i1 = data->num_sensors;
1134 pmbus_add_sensor(data, "curr", "lcrit", in_index, page,
1135 PMBUS_IOUT_UC_FAULT_LIMIT,
1136 PSC_CURRENT_OUT, false);
1137 if (info->func[page] & PMBUS_HAVE_STATUS_IOUT) {
1138 pmbus_add_boolean_reg(data, "curr",
1139 "lcrit_alarm",
1140 in_index,
1141 PB_STATUS_IOUT_BASE +
1142 page, PB_IOUT_UC_FAULT);
1143 have_alarm = true;
1144 }
1145 }
1146 if (pmbus_check_word_register(client, page,
1147 PMBUS_IOUT_OC_FAULT_LIMIT)) {
1148 i1 = data->num_sensors;
1149 pmbus_add_sensor(data, "curr", "crit", in_index, page,
1150 PMBUS_IOUT_OC_FAULT_LIMIT,
1151 PSC_CURRENT_OUT, false);
1152 if (info->func[page] & PMBUS_HAVE_STATUS_IOUT) {
1153 pmbus_add_boolean_reg(data, "curr",
1154 "crit_alarm",
1155 in_index,
1156 PB_STATUS_IOUT_BASE +
1157 page, PB_IOUT_OC_FAULT);
1158 have_alarm = true;
1159 }
1160 }
1161 /*
1162 * Add generic alarm attribute only if there are no individual
1163 * attributes.
1164 */
1165 if (!have_alarm)
1166 pmbus_add_boolean_reg(data, "curr", "alarm",
1167 in_index,
1168 PB_STATUS_BASE + page,
1169 PB_STATUS_IOUT_OC);
1170 in_index++;
1171 }
1172
1173 /*
1174 * Power sensors
1175 */
1176 /*
1177 * Input Power sensors
1178 */
1179 in_index = 1;
1180 if (info->func[0] & PMBUS_HAVE_PIN) {
1181 i0 = data->num_sensors;
1182 pmbus_add_label(data, "power", in_index, "pin", 0);
1183 pmbus_add_sensor(data, "power", "input", in_index,
1184 0, PMBUS_READ_PIN, PSC_POWER, true);
1185 if (pmbus_check_word_register(client, 0,
1186 PMBUS_PIN_OP_WARN_LIMIT)) {
1187 i1 = data->num_sensors;
1188 pmbus_add_sensor(data, "power", "max", in_index,
1189 0, PMBUS_PIN_OP_WARN_LIMIT, PSC_POWER,
1190 false);
1191 if (info->func[0] & PMBUS_HAVE_STATUS_INPUT)
1192 pmbus_add_boolean_reg(data, "power",
1193 "alarm",
1194 in_index,
1195 PB_STATUS_INPUT_BASE,
1196 PB_PIN_OP_WARNING);
1197 }
1198 in_index++;
1199 }
1200
1201 /*
1202 * Output Power sensors
1203 */
1204 for (page = 0; page < info->pages; page++) {
1205 bool need_alarm = false;
1206
1207 if (!(info->func[page] & PMBUS_HAVE_POUT))
1208 continue;
1209
1210 i0 = data->num_sensors;
1211 pmbus_add_label(data, "power", in_index, "pout", page + 1);
1212 pmbus_add_sensor(data, "power", "input", in_index, page,
1213 PMBUS_READ_POUT, PSC_POWER, true);
1214 /*
1215 * Per hwmon sysfs API, power_cap is to be used to limit output
1216 * power.
1217 * We have two registers related to maximum output power,
1218 * PMBUS_POUT_MAX and PMBUS_POUT_OP_WARN_LIMIT.
1219 * PMBUS_POUT_MAX matches the powerX_cap attribute definition.
1220 * There is no attribute in the API to match
1221 * PMBUS_POUT_OP_WARN_LIMIT. We use powerX_max for now.
1222 */
1223 if (pmbus_check_word_register(client, page, PMBUS_POUT_MAX)) {
1224 i1 = data->num_sensors;
1225 pmbus_add_sensor(data, "power", "cap", in_index, page,
1226 PMBUS_POUT_MAX, PSC_POWER, false);
1227 need_alarm = true;
1228 }
1229 if (pmbus_check_word_register(client, page,
1230 PMBUS_POUT_OP_WARN_LIMIT)) {
1231 i1 = data->num_sensors;
1232 pmbus_add_sensor(data, "power", "max", in_index, page,
1233 PMBUS_POUT_OP_WARN_LIMIT, PSC_POWER,
1234 false);
1235 need_alarm = true;
1236 }
1237 if (need_alarm && (info->func[page] & PMBUS_HAVE_STATUS_IOUT))
1238 pmbus_add_boolean_reg(data, "power", "alarm",
1239 in_index,
1240 PB_STATUS_IOUT_BASE + page,
1241 PB_POUT_OP_WARNING
1242 | PB_POWER_LIMITING);
1243
1244 if (pmbus_check_word_register(client, page,
1245 PMBUS_POUT_OP_FAULT_LIMIT)) {
1246 i1 = data->num_sensors;
1247 pmbus_add_sensor(data, "power", "crit", in_index, page,
1248 PMBUS_POUT_OP_FAULT_LIMIT, PSC_POWER,
1249 false);
1250 if (info->func[page] & PMBUS_HAVE_STATUS_IOUT)
1251 pmbus_add_boolean_reg(data, "power",
1252 "crit_alarm",
1253 in_index,
1254 PB_STATUS_IOUT_BASE
1255 + page,
1256 PB_POUT_OP_FAULT);
1257 }
1258 in_index++;
1259 }
1260
1261 /*
1262 * Temperature sensors
1263 */
1264 in_index = 1;
1265 for (page = 0; page < info->pages; page++) {
1266 int t, temps;
1267
1268 if (!(info->func[page] & PMBUS_HAVE_TEMP))
1269 continue;
1270
1271 temps = page ? 1 : ARRAY_SIZE(pmbus_temp_registers);
1272 for (t = 0; t < temps; t++) {
1273 bool have_alarm = false;
1274
1275 if (!pmbus_check_word_register
1276 (client, page, pmbus_temp_registers[t]))
1277 break;
1278
1279 i0 = data->num_sensors;
1280 pmbus_add_sensor(data, "temp", "input", in_index, page,
1281 pmbus_temp_registers[t],
1282 PSC_TEMPERATURE, true);
1283
1284 /*
1285 * PMBus provides only one status register for TEMP1-3.
1286 * Thus, we can not use the status register to determine
1287 * which of the three sensors actually caused an alarm.
1288 * Always compare current temperature against the limit
1289 * registers to determine alarm conditions for a
1290 * specific sensor.
1291 */
1292 if (pmbus_check_word_register
1293 (client, page, PMBUS_UT_WARN_LIMIT)) {
1294 i1 = data->num_sensors;
1295 pmbus_add_sensor(data, "temp", "min", in_index,
1296 page, PMBUS_UT_WARN_LIMIT,
1297 PSC_TEMPERATURE, false);
1298 if (info->func[page] & PMBUS_HAVE_STATUS_TEMP) {
1299 pmbus_add_boolean_cmp(data, "temp",
1300 "min_alarm", in_index, i1, i0,
1301 PB_STATUS_TEMP_BASE + page,
1302 PB_TEMP_UT_WARNING);
1303 have_alarm = true;
1304 }
1305 }
1306 if (pmbus_check_word_register(client, page,
1307 PMBUS_UT_FAULT_LIMIT)) {
1308 i1 = data->num_sensors;
1309 pmbus_add_sensor(data, "temp", "lcrit",
1310 in_index, page,
1311 PMBUS_UT_FAULT_LIMIT,
1312 PSC_TEMPERATURE, false);
1313 if (info->func[page] & PMBUS_HAVE_STATUS_TEMP) {
1314 pmbus_add_boolean_cmp(data, "temp",
1315 "lcrit_alarm", in_index, i1, i0,
1316 PB_STATUS_TEMP_BASE + page,
1317 PB_TEMP_UT_FAULT);
1318 have_alarm = true;
1319 }
1320 }
1321 if (pmbus_check_word_register
1322 (client, page, PMBUS_OT_WARN_LIMIT)) {
1323 i1 = data->num_sensors;
1324 pmbus_add_sensor(data, "temp", "max", in_index,
1325 page, PMBUS_OT_WARN_LIMIT,
1326 PSC_TEMPERATURE, false);
1327 if (info->func[page] & PMBUS_HAVE_STATUS_TEMP) {
1328 pmbus_add_boolean_cmp(data, "temp",
1329 "max_alarm", in_index, i0, i1,
1330 PB_STATUS_TEMP_BASE + page,
1331 PB_TEMP_OT_WARNING);
1332 have_alarm = true;
1333 }
1334 }
1335 if (pmbus_check_word_register(client, page,
1336 PMBUS_OT_FAULT_LIMIT)) {
1337 i1 = data->num_sensors;
1338 pmbus_add_sensor(data, "temp", "crit", in_index,
1339 page, PMBUS_OT_FAULT_LIMIT,
1340 PSC_TEMPERATURE, false);
1341 if (info->func[page] & PMBUS_HAVE_STATUS_TEMP) {
1342 pmbus_add_boolean_cmp(data, "temp",
1343 "crit_alarm", in_index, i0, i1,
1344 PB_STATUS_TEMP_BASE + page,
1345 PB_TEMP_OT_FAULT);
1346 have_alarm = true;
1347 }
1348 }
1349 /*
1350 * Last resort - we were not able to create any alarm
1351 * registers. Report alarm for all sensors using the
1352 * status register temperature alarm bit.
1353 */
1354 if (!have_alarm)
1355 pmbus_add_boolean_reg(data, "temp", "alarm",
1356 in_index,
1357 PB_STATUS_BASE + page,
1358 PB_STATUS_TEMPERATURE);
1359 in_index++;
1360 }
1361 }
1362
1363 /*
1364 * Fans
1365 */
1366 in_index = 1;
1367 for (page = 0; page < info->pages; page++) {
1368 int fans, f;
1369
1370 if (!(info->func[page] & PMBUS_HAVE_FAN12))
1371 continue;
1372
1373 fans = page ? 1 : ARRAY_SIZE(pmbus_fan_registers);
1374 for (f = 0; f < fans; f++) {
1375 int regval;
1376
1377 if (!pmbus_check_word_register(client, page,
1378 pmbus_fan_registers[f])
1379 || !pmbus_check_byte_register(client, page,
1380 pmbus_fan_config_registers[f]))
1381 break;
1382
1383 /*
1384 * Skip fan if not installed.
1385 * Each fan configuration register covers multiple fans,
1386 * so we have to do some magic.
1387 */
1388 regval = pmbus_read_byte_data(client, page,
1389 pmbus_fan_config_registers[f]);
1390 if (regval < 0 ||
1391 (!(regval & (PB_FAN_1_INSTALLED >> ((f & 1) * 4)))))
1392 continue;
1393
1394 i0 = data->num_sensors;
1395 pmbus_add_sensor(data, "fan", "input", in_index, page,
1396 pmbus_fan_registers[f], PSC_FAN, true);
1397
1398 /*
1399 * Each fan status register covers multiple fans,
1400 * so we have to do some magic.
1401 */
1402 if (pmbus_check_byte_register
1403 (client, page, pmbus_fan_status_registers[f])) {
1404 int base;
1405
1406 if (f > 1) /* fan 3, 4 */
1407 base = PB_STATUS_FAN34_BASE;
1408 else
1409 base = PB_STATUS_FAN_BASE + page;
1410 pmbus_add_boolean_reg(data, "fan", "alarm",
1411 in_index, base,
1412 PB_FAN_FAN1_WARNING >> (f & 1));
1413 pmbus_add_boolean_reg(data, "fan", "fault",
1414 in_index, base,
1415 PB_FAN_FAN1_FAULT >> (f & 1));
1416 }
1417 in_index++;
1418 }
1419 }
1420}
1421
1422/*
1423 * Identify chip parameters.
1424 * This function is called for all chips.
1425 */
1426static int pmbus_identify_common(struct i2c_client *client,
1427 struct pmbus_data *data)
1428{
1429 int vout_mode, exponent;
1430
1431 vout_mode = pmbus_read_byte_data(client, 0, PMBUS_VOUT_MODE);
1432 if (vout_mode >= 0) {
1433 /*
1434 * Not all chips support the VOUT_MODE command,
1435 * so a failure to read it is not an error.
1436 */
1437 switch (vout_mode >> 5) {
1438 case 0: /* linear mode */
1439 if (data->info->direct[PSC_VOLTAGE_OUT])
1440 return -ENODEV;
1441
1442 exponent = vout_mode & 0x1f;
1443 /* and sign-extend it */
1444 if (exponent & 0x10)
1445 exponent |= ~0x1f;
1446 data->exponent = exponent;
1447 break;
1448 case 2: /* direct mode */
1449 if (!data->info->direct[PSC_VOLTAGE_OUT])
1450 return -ENODEV;
1451 break;
1452 default:
1453 return -ENODEV;
1454 }
1455 }
1456
1457 /* Determine maximum number of sensors, booleans, and labels */
1458 pmbus_find_max_attr(client, data);
1459 pmbus_clear_fault_page(client, 0);
1460 return 0;
1461}
1462
1463int pmbus_do_probe(struct i2c_client *client, const struct i2c_device_id *id,
1464 struct pmbus_driver_info *info)
1465{
1466 const struct pmbus_platform_data *pdata = client->dev.platform_data;
1467 struct pmbus_data *data;
1468 int ret;
1469
1470 if (!info) {
1471 dev_err(&client->dev, "Missing chip information");
1472 return -ENODEV;
1473 }
1474
1475 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE
1476 | I2C_FUNC_SMBUS_BYTE_DATA
1477 | I2C_FUNC_SMBUS_WORD_DATA))
1478 return -ENODEV;
1479
1480 data = kzalloc(sizeof(*data), GFP_KERNEL);
1481 if (!data) {
1482 dev_err(&client->dev, "No memory to allocate driver data\n");
1483 return -ENOMEM;
1484 }
1485
1486 i2c_set_clientdata(client, data);
1487 mutex_init(&data->update_lock);
1488
1489 /*
1490 * Bail out if status register or PMBus revision register
1491 * does not exist.
1492 */
1493 if (i2c_smbus_read_byte_data(client, PMBUS_STATUS_BYTE) < 0
1494 || i2c_smbus_read_byte_data(client, PMBUS_REVISION) < 0) {
1495 dev_err(&client->dev,
1496 "Status or revision register not found\n");
1497 ret = -ENODEV;
1498 goto out_data;
1499 }
1500
1501 if (pdata)
1502 data->flags = pdata->flags;
1503 data->info = info;
1504
1505 pmbus_clear_faults(client);
1506
1507 if (info->identify) {
1508 ret = (*info->identify)(client, info);
1509 if (ret < 0) {
1510 dev_err(&client->dev, "Chip identification failed\n");
1511 goto out_data;
1512 }
1513 }
1514
1515 if (info->pages <= 0 || info->pages > PMBUS_PAGES) {
1516 dev_err(&client->dev, "Bad number of PMBus pages: %d\n",
1517 info->pages);
1518 ret = -EINVAL;
1519 goto out_data;
1520 }
1521 /*
1522 * Bail out if more than one page was configured, but we can not
1523 * select the highest page. This is an indication that the wrong
1524 * chip type was selected. Better bail out now than keep
1525 * returning errors later on.
1526 */
1527 if (info->pages > 1 && pmbus_set_page(client, info->pages - 1) < 0) {
1528 dev_err(&client->dev, "Failed to select page %d\n",
1529 info->pages - 1);
1530 ret = -EINVAL;
1531 goto out_data;
1532 }
1533
1534 ret = pmbus_identify_common(client, data);
1535 if (ret < 0) {
1536 dev_err(&client->dev, "Failed to identify chip capabilities\n");
1537 goto out_data;
1538 }
1539
1540 ret = -ENOMEM;
1541 data->sensors = kzalloc(sizeof(struct pmbus_sensor) * data->max_sensors,
1542 GFP_KERNEL);
1543 if (!data->sensors) {
1544 dev_err(&client->dev, "No memory to allocate sensor data\n");
1545 goto out_data;
1546 }
1547
1548 data->booleans = kzalloc(sizeof(struct pmbus_boolean)
1549 * data->max_booleans, GFP_KERNEL);
1550 if (!data->booleans) {
1551 dev_err(&client->dev, "No memory to allocate boolean data\n");
1552 goto out_sensors;
1553 }
1554
1555 data->labels = kzalloc(sizeof(struct pmbus_label) * data->max_labels,
1556 GFP_KERNEL);
1557 if (!data->labels) {
1558 dev_err(&client->dev, "No memory to allocate label data\n");
1559 goto out_booleans;
1560 }
1561
1562 data->attributes = kzalloc(sizeof(struct attribute *)
1563 * data->max_attributes, GFP_KERNEL);
1564 if (!data->attributes) {
1565 dev_err(&client->dev, "No memory to allocate attribute data\n");
1566 goto out_labels;
1567 }
1568
1569 pmbus_find_attributes(client, data);
1570
1571 /*
1572 * If there are no attributes, something is wrong.
1573 * Bail out instead of trying to register nothing.
1574 */
1575 if (!data->num_attributes) {
1576 dev_err(&client->dev, "No attributes found\n");
1577 ret = -ENODEV;
1578 goto out_attributes;
1579 }
1580
1581 /* Register sysfs hooks */
1582 data->group.attrs = data->attributes;
1583 ret = sysfs_create_group(&client->dev.kobj, &data->group);
1584 if (ret) {
1585 dev_err(&client->dev, "Failed to create sysfs entries\n");
1586 goto out_attributes;
1587 }
1588 data->hwmon_dev = hwmon_device_register(&client->dev);
1589 if (IS_ERR(data->hwmon_dev)) {
1590 ret = PTR_ERR(data->hwmon_dev);
1591 dev_err(&client->dev, "Failed to register hwmon device\n");
1592 goto out_hwmon_device_register;
1593 }
1594 return 0;
1595
1596out_hwmon_device_register:
1597 sysfs_remove_group(&client->dev.kobj, &data->group);
1598out_attributes:
1599 kfree(data->attributes);
1600out_labels:
1601 kfree(data->labels);
1602out_booleans:
1603 kfree(data->booleans);
1604out_sensors:
1605 kfree(data->sensors);
1606out_data:
1607 kfree(data);
1608 return ret;
1609}
1610EXPORT_SYMBOL_GPL(pmbus_do_probe);
1611
1612int pmbus_do_remove(struct i2c_client *client)
1613{
1614 struct pmbus_data *data = i2c_get_clientdata(client);
1615 hwmon_device_unregister(data->hwmon_dev);
1616 sysfs_remove_group(&client->dev.kobj, &data->group);
1617 kfree(data->attributes);
1618 kfree(data->labels);
1619 kfree(data->booleans);
1620 kfree(data->sensors);
1621 kfree(data);
1622 return 0;
1623}
1624EXPORT_SYMBOL_GPL(pmbus_do_remove);
1625
1626MODULE_AUTHOR("Guenter Roeck");
1627MODULE_DESCRIPTION("PMBus core driver");
1628MODULE_LICENSE("GPL");
diff --git a/include/linux/i2c/pmbus.h b/include/linux/i2c/pmbus.h
new file mode 100644
index 000000000000..69280db02c41
--- /dev/null
+++ b/include/linux/i2c/pmbus.h
@@ -0,0 +1,45 @@
1/*
2 * Hardware monitoring driver for PMBus devices
3 *
4 * Copyright (c) 2010, 2011 Ericsson AB.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 */
20
21#ifndef _PMBUS_H_
22#define _PMBUS_H_
23
24/* flags */
25
26/*
27 * PMBUS_SKIP_STATUS_CHECK
28 *
29 * During register detection, skip checking the status register for
30 * communication or command errors.
31 *
32 * Some PMBus chips respond with valid data when trying to read an unsupported
33 * register. For such chips, checking the status register is mandatory when
34 * trying to determine if a chip register exists or not.
35 * Other PMBus chips don't support the STATUS_CML register, or report
36 * communication errors for no explicable reason. For such chips, checking
37 * the status register must be disabled.
38 */
39#define PMBUS_SKIP_STATUS_CHECK (1 << 0)
40
41struct pmbus_platform_data {
42 u32 flags; /* Device specific flags */
43};
44
45#endif /* _PMBUS_H_ */
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-20 14:02:01 -0500