aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/hwmon/ucd9200.c
diff options
context:
space:
mode:
authorGuenter Roeck <guenter.roeck@ericsson.com>2011-07-12 10:15:19 -0400
committerGuenter Roeck <guenter.roeck@ericsson.com>2011-07-28 14:47:53 -0400
commit9d2ecfb768bd2f8b41816a23b0f1dda026fef41d (patch)
tree7424d830c0b8475d2c872ec0bd1953b354c01094 /drivers/hwmon/ucd9200.c
parentc814a4c7c4aad795835583344353963a0a673eb0 (diff)
hwmon: (pmbus) Move PMBus drivers to drivers/hwmon/pmbus
Since the number of PMBus drivers is getting large, move them into directory drivers/hwmon/pmbus to improve readability and scalability. Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com> Reviewed-by: Robert Coulson <robert.coulson@ericsson.com>
Diffstat (limited to 'drivers/hwmon/ucd9200.c')
-rw-r--r--drivers/hwmon/ucd9200.c210
1 files changed, 0 insertions, 210 deletions
diff --git a/drivers/hwmon/ucd9200.c b/drivers/hwmon/ucd9200.c
deleted file mode 100644
index ffcc1cf3609d..000000000000
--- a/drivers/hwmon/ucd9200.c
+++ /dev/null
@@ -1,210 +0,0 @@
1/*
2 * Hardware monitoring driver for ucd9200 series Digital PWM System Controllers
3 *
4 * Copyright (C) 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/i2c/pmbus.h>
28#include "pmbus.h"
29
30#define UCD9200_PHASE_INFO 0xd2
31#define UCD9200_DEVICE_ID 0xfd
32
33enum chips { ucd9200, ucd9220, ucd9222, ucd9224, ucd9240, ucd9244, ucd9246,
34 ucd9248 };
35
36static const struct i2c_device_id ucd9200_id[] = {
37 {"ucd9200", ucd9200},
38 {"ucd9220", ucd9220},
39 {"ucd9222", ucd9222},
40 {"ucd9224", ucd9224},
41 {"ucd9240", ucd9240},
42 {"ucd9244", ucd9244},
43 {"ucd9246", ucd9246},
44 {"ucd9248", ucd9248},
45 {}
46};
47MODULE_DEVICE_TABLE(i2c, ucd9200_id);
48
49static int ucd9200_probe(struct i2c_client *client,
50 const struct i2c_device_id *id)
51{
52 u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1];
53 struct pmbus_driver_info *info;
54 const struct i2c_device_id *mid;
55 int i, j, ret;
56
57 if (!i2c_check_functionality(client->adapter,
58 I2C_FUNC_SMBUS_BYTE_DATA |
59 I2C_FUNC_SMBUS_BLOCK_DATA))
60 return -ENODEV;
61
62 ret = i2c_smbus_read_block_data(client, UCD9200_DEVICE_ID,
63 block_buffer);
64 if (ret < 0) {
65 dev_err(&client->dev, "Failed to read device ID\n");
66 return ret;
67 }
68 block_buffer[ret] = '\0';
69 dev_info(&client->dev, "Device ID %s\n", block_buffer);
70
71 mid = NULL;
72 for (i = 0; i < ARRAY_SIZE(ucd9200_id); i++) {
73 mid = &ucd9200_id[i];
74 if (!strncasecmp(mid->name, block_buffer, strlen(mid->name)))
75 break;
76 }
77 if (!mid || !strlen(mid->name)) {
78 dev_err(&client->dev, "Unsupported device\n");
79 return -ENODEV;
80 }
81 if (id->driver_data != ucd9200 && id->driver_data != mid->driver_data)
82 dev_notice(&client->dev,
83 "Device mismatch: Configured %s, detected %s\n",
84 id->name, mid->name);
85
86 info = kzalloc(sizeof(struct pmbus_driver_info), GFP_KERNEL);
87 if (!info)
88 return -ENOMEM;
89
90 ret = i2c_smbus_read_block_data(client, UCD9200_PHASE_INFO,
91 block_buffer);
92 if (ret < 0) {
93 dev_err(&client->dev, "Failed to read phase information\n");
94 goto out;
95 }
96
97 /*
98 * Calculate number of configured pages (rails) from PHASE_INFO
99 * register.
100 * Rails have to be sequential, so we can abort after finding
101 * the first unconfigured rail.
102 */
103 info->pages = 0;
104 for (i = 0; i < ret; i++) {
105 if (!block_buffer[i])
106 break;
107 info->pages++;
108 }
109 if (!info->pages) {
110 dev_err(&client->dev, "No rails configured\n");
111 ret = -ENODEV;
112 goto out;
113 }
114 dev_info(&client->dev, "%d rails configured\n", info->pages);
115
116 /*
117 * Set PHASE registers on all pages to 0xff to ensure that phase
118 * specific commands will apply to all phases of a given page (rail).
119 * This only affects the READ_IOUT and READ_TEMPERATURE2 registers.
120 * READ_IOUT will return the sum of currents of all phases of a rail,
121 * and READ_TEMPERATURE2 will return the maximum temperature detected
122 * for the the phases of the rail.
123 */
124 for (i = 0; i < info->pages; i++) {
125 /*
126 * Setting PAGE & PHASE fails once in a while for no obvious
127 * reason, so we need to retry a couple of times.
128 */
129 for (j = 0; j < 3; j++) {
130 ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, i);
131 if (ret < 0)
132 continue;
133 ret = i2c_smbus_write_byte_data(client, PMBUS_PHASE,
134 0xff);
135 if (ret < 0)
136 continue;
137 break;
138 }
139 if (ret < 0) {
140 dev_err(&client->dev,
141 "Failed to initialize PHASE registers\n");
142 goto out;
143 }
144 }
145 if (info->pages > 1)
146 i2c_smbus_write_byte_data(client, PMBUS_PAGE, 0);
147
148 info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT |
149 PMBUS_HAVE_IIN | PMBUS_HAVE_PIN |
150 PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
151 PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
152 PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP |
153 PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP;
154
155 for (i = 1; i < info->pages; i++)
156 info->func[i] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
157 PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
158 PMBUS_HAVE_POUT |
159 PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP;
160
161 /* ucd9240 supports a single fan */
162 if (mid->driver_data == ucd9240)
163 info->func[0] |= PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12;
164
165 ret = pmbus_do_probe(client, mid, info);
166 if (ret < 0)
167 goto out;
168 return 0;
169out:
170 kfree(info);
171 return ret;
172}
173
174static int ucd9200_remove(struct i2c_client *client)
175{
176 int ret;
177 const struct pmbus_driver_info *info;
178
179 info = pmbus_get_driver_info(client);
180 ret = pmbus_do_remove(client);
181 kfree(info);
182 return ret;
183}
184
185
186/* This is the driver that will be inserted */
187static struct i2c_driver ucd9200_driver = {
188 .driver = {
189 .name = "ucd9200",
190 },
191 .probe = ucd9200_probe,
192 .remove = ucd9200_remove,
193 .id_table = ucd9200_id,
194};
195
196static int __init ucd9200_init(void)
197{
198 return i2c_add_driver(&ucd9200_driver);
199}
200
201static void __exit ucd9200_exit(void)
202{
203 i2c_del_driver(&ucd9200_driver);
204}
205
206MODULE_AUTHOR("Guenter Roeck");
207MODULE_DESCRIPTION("PMBus driver for TI UCD922x, UCD924x");
208MODULE_LICENSE("GPL");
209module_init(ucd9200_init);
210module_exit(ucd9200_exit);