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Diffstat (limited to 'drivers/i2c/chips/lm75.c')
-rw-r--r--drivers/i2c/chips/lm75.c296
1 files changed, 0 insertions, 296 deletions
diff --git a/drivers/i2c/chips/lm75.c b/drivers/i2c/chips/lm75.c
deleted file mode 100644
index 5be164ed278e..000000000000
--- a/drivers/i2c/chips/lm75.c
+++ /dev/null
@@ -1,296 +0,0 @@
1/*
2 lm75.c - Part of lm_sensors, Linux kernel modules for hardware
3 monitoring
4 Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl>
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/module.h>
22#include <linux/init.h>
23#include <linux/slab.h>
24#include <linux/jiffies.h>
25#include <linux/i2c.h>
26#include <linux/i2c-sensor.h>
27#include "lm75.h"
28
29
30/* Addresses to scan */
31static unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c,
32 0x4d, 0x4e, 0x4f, I2C_CLIENT_END };
33static unsigned int normal_isa[] = { I2C_CLIENT_ISA_END };
34
35/* Insmod parameters */
36SENSORS_INSMOD_1(lm75);
37
38/* Many LM75 constants specified below */
39
40/* The LM75 registers */
41#define LM75_REG_TEMP 0x00
42#define LM75_REG_CONF 0x01
43#define LM75_REG_TEMP_HYST 0x02
44#define LM75_REG_TEMP_OS 0x03
45
46/* Each client has this additional data */
47struct lm75_data {
48 struct i2c_client client;
49 struct semaphore update_lock;
50 char valid; /* !=0 if following fields are valid */
51 unsigned long last_updated; /* In jiffies */
52 u16 temp_input; /* Register values */
53 u16 temp_max;
54 u16 temp_hyst;
55};
56
57static int lm75_attach_adapter(struct i2c_adapter *adapter);
58static int lm75_detect(struct i2c_adapter *adapter, int address, int kind);
59static void lm75_init_client(struct i2c_client *client);
60static int lm75_detach_client(struct i2c_client *client);
61static int lm75_read_value(struct i2c_client *client, u8 reg);
62static int lm75_write_value(struct i2c_client *client, u8 reg, u16 value);
63static struct lm75_data *lm75_update_device(struct device *dev);
64
65
66/* This is the driver that will be inserted */
67static struct i2c_driver lm75_driver = {
68 .owner = THIS_MODULE,
69 .name = "lm75",
70 .id = I2C_DRIVERID_LM75,
71 .flags = I2C_DF_NOTIFY,
72 .attach_adapter = lm75_attach_adapter,
73 .detach_client = lm75_detach_client,
74};
75
76#define show(value) \
77static ssize_t show_##value(struct device *dev, struct device_attribute *attr, char *buf) \
78{ \
79 struct lm75_data *data = lm75_update_device(dev); \
80 return sprintf(buf, "%d\n", LM75_TEMP_FROM_REG(data->value)); \
81}
82show(temp_max);
83show(temp_hyst);
84show(temp_input);
85
86#define set(value, reg) \
87static ssize_t set_##value(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) \
88{ \
89 struct i2c_client *client = to_i2c_client(dev); \
90 struct lm75_data *data = i2c_get_clientdata(client); \
91 int temp = simple_strtoul(buf, NULL, 10); \
92 \
93 down(&data->update_lock); \
94 data->value = LM75_TEMP_TO_REG(temp); \
95 lm75_write_value(client, reg, data->value); \
96 up(&data->update_lock); \
97 return count; \
98}
99set(temp_max, LM75_REG_TEMP_OS);
100set(temp_hyst, LM75_REG_TEMP_HYST);
101
102static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_max, set_temp_max);
103static DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, show_temp_hyst, set_temp_hyst);
104static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input, NULL);
105
106static int lm75_attach_adapter(struct i2c_adapter *adapter)
107{
108 if (!(adapter->class & I2C_CLASS_HWMON))
109 return 0;
110 return i2c_detect(adapter, &addr_data, lm75_detect);
111}
112
113/* This function is called by i2c_detect */
114static int lm75_detect(struct i2c_adapter *adapter, int address, int kind)
115{
116 int i;
117 struct i2c_client *new_client;
118 struct lm75_data *data;
119 int err = 0;
120 const char *name = "";
121
122 /* Make sure we aren't probing the ISA bus!! This is just a safety check
123 at this moment; i2c_detect really won't call us. */
124#ifdef DEBUG
125 if (i2c_is_isa_adapter(adapter)) {
126 dev_dbg(&adapter->dev,
127 "lm75_detect called for an ISA bus adapter?!?\n");
128 goto exit;
129 }
130#endif
131
132 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
133 I2C_FUNC_SMBUS_WORD_DATA))
134 goto exit;
135
136 /* OK. For now, we presume we have a valid client. We now create the
137 client structure, even though we cannot fill it completely yet.
138 But it allows us to access lm75_{read,write}_value. */
139 if (!(data = kmalloc(sizeof(struct lm75_data), GFP_KERNEL))) {
140 err = -ENOMEM;
141 goto exit;
142 }
143 memset(data, 0, sizeof(struct lm75_data));
144
145 new_client = &data->client;
146 i2c_set_clientdata(new_client, data);
147 new_client->addr = address;
148 new_client->adapter = adapter;
149 new_client->driver = &lm75_driver;
150 new_client->flags = 0;
151
152 /* Now, we do the remaining detection. There is no identification-
153 dedicated register so we have to rely on several tricks:
154 unused bits, registers cycling over 8-address boundaries,
155 addresses 0x04-0x07 returning the last read value.
156 The cycling+unused addresses combination is not tested,
157 since it would significantly slow the detection down and would
158 hardly add any value. */
159 if (kind < 0) {
160 int cur, conf, hyst, os;
161
162 /* Unused addresses */
163 cur = i2c_smbus_read_word_data(new_client, 0);
164 conf = i2c_smbus_read_byte_data(new_client, 1);
165 hyst = i2c_smbus_read_word_data(new_client, 2);
166 if (i2c_smbus_read_word_data(new_client, 4) != hyst
167 || i2c_smbus_read_word_data(new_client, 5) != hyst
168 || i2c_smbus_read_word_data(new_client, 6) != hyst
169 || i2c_smbus_read_word_data(new_client, 7) != hyst)
170 goto exit_free;
171 os = i2c_smbus_read_word_data(new_client, 3);
172 if (i2c_smbus_read_word_data(new_client, 4) != os
173 || i2c_smbus_read_word_data(new_client, 5) != os
174 || i2c_smbus_read_word_data(new_client, 6) != os
175 || i2c_smbus_read_word_data(new_client, 7) != os)
176 goto exit_free;
177
178 /* Unused bits */
179 if (conf & 0xe0)
180 goto exit_free;
181
182 /* Addresses cycling */
183 for (i = 8; i < 0xff; i += 8)
184 if (i2c_smbus_read_byte_data(new_client, i + 1) != conf
185 || i2c_smbus_read_word_data(new_client, i + 2) != hyst
186 || i2c_smbus_read_word_data(new_client, i + 3) != os)
187 goto exit_free;
188 }
189
190 /* Determine the chip type - only one kind supported! */
191 if (kind <= 0)
192 kind = lm75;
193
194 if (kind == lm75) {
195 name = "lm75";
196 }
197
198 /* Fill in the remaining client fields and put it into the global list */
199 strlcpy(new_client->name, name, I2C_NAME_SIZE);
200 data->valid = 0;
201 init_MUTEX(&data->update_lock);
202
203 /* Tell the I2C layer a new client has arrived */
204 if ((err = i2c_attach_client(new_client)))
205 goto exit_free;
206
207 /* Initialize the LM75 chip */
208 lm75_init_client(new_client);
209
210 /* Register sysfs hooks */
211 device_create_file(&new_client->dev, &dev_attr_temp1_max);
212 device_create_file(&new_client->dev, &dev_attr_temp1_max_hyst);
213 device_create_file(&new_client->dev, &dev_attr_temp1_input);
214
215 return 0;
216
217exit_free:
218 kfree(data);
219exit:
220 return err;
221}
222
223static int lm75_detach_client(struct i2c_client *client)
224{
225 i2c_detach_client(client);
226 kfree(i2c_get_clientdata(client));
227 return 0;
228}
229
230/* All registers are word-sized, except for the configuration register.
231 LM75 uses a high-byte first convention, which is exactly opposite to
232 the usual practice. */
233static int lm75_read_value(struct i2c_client *client, u8 reg)
234{
235 if (reg == LM75_REG_CONF)
236 return i2c_smbus_read_byte_data(client, reg);
237 else
238 return swab16(i2c_smbus_read_word_data(client, reg));
239}
240
241/* All registers are word-sized, except for the configuration register.
242 LM75 uses a high-byte first convention, which is exactly opposite to
243 the usual practice. */
244static int lm75_write_value(struct i2c_client *client, u8 reg, u16 value)
245{
246 if (reg == LM75_REG_CONF)
247 return i2c_smbus_write_byte_data(client, reg, value);
248 else
249 return i2c_smbus_write_word_data(client, reg, swab16(value));
250}
251
252static void lm75_init_client(struct i2c_client *client)
253{
254 /* Initialize the LM75 chip */
255 lm75_write_value(client, LM75_REG_CONF, 0);
256}
257
258static struct lm75_data *lm75_update_device(struct device *dev)
259{
260 struct i2c_client *client = to_i2c_client(dev);
261 struct lm75_data *data = i2c_get_clientdata(client);
262
263 down(&data->update_lock);
264
265 if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
266 || !data->valid) {
267 dev_dbg(&client->dev, "Starting lm75 update\n");
268
269 data->temp_input = lm75_read_value(client, LM75_REG_TEMP);
270 data->temp_max = lm75_read_value(client, LM75_REG_TEMP_OS);
271 data->temp_hyst = lm75_read_value(client, LM75_REG_TEMP_HYST);
272 data->last_updated = jiffies;
273 data->valid = 1;
274 }
275
276 up(&data->update_lock);
277
278 return data;
279}
280
281static int __init sensors_lm75_init(void)
282{
283 return i2c_add_driver(&lm75_driver);
284}
285
286static void __exit sensors_lm75_exit(void)
287{
288 i2c_del_driver(&lm75_driver);
289}
290
291MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>");
292MODULE_DESCRIPTION("LM75 driver");
293MODULE_LICENSE("GPL");
294
295module_init(sensors_lm75_init);
296module_exit(sensors_lm75_exit);
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-18 15:47:44 -0500