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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * w83l785ts.c - Part of lm_sensors, Linux kernel modules for hardware | |
3 | * monitoring | |
a1fa4cdc | 4 | * Copyright (C) 2003-2009 Jean Delvare <khali@linux-fr.org> |
1da177e4 LT |
5 | * |
6 | * Inspired from the lm83 driver. The W83L785TS-S is a sensor chip made | |
7 | * by Winbond. It reports a single external temperature with a 1 deg | |
8 | * resolution and a 3 deg accuracy. Datasheet can be obtained from | |
9 | * Winbond's website at: | |
10 | * http://www.winbond-usa.com/products/winbond_products/pdfs/PCIC/W83L785TS-S.pdf | |
11 | * | |
12 | * Ported to Linux 2.6 by Wolfgang Ziegler <nuppla@gmx.at> and Jean Delvare | |
13 | * <khali@linux-fr.org>. | |
14 | * | |
15 | * Thanks to James Bolt <james@evilpenguin.com> for benchmarking the read | |
16 | * error handling mechanism. | |
17 | * | |
18 | * This program is free software; you can redistribute it and/or modify | |
19 | * it under the terms of the GNU General Public License as published by | |
20 | * the Free Software Foundation; either version 2 of the License, or | |
21 | * (at your option) any later version. | |
22 | * | |
23 | * This program is distributed in the hope that it will be useful, | |
24 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
25 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
26 | * GNU General Public License for more details. | |
27 | * | |
28 | * You should have received a copy of the GNU General Public License | |
29 | * along with this program; if not, write to the Free Software | |
30 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
31 | */ | |
32 | ||
1da177e4 LT |
33 | #include <linux/module.h> |
34 | #include <linux/delay.h> | |
35 | #include <linux/init.h> | |
36 | #include <linux/slab.h> | |
37 | #include <linux/jiffies.h> | |
38 | #include <linux/i2c.h> | |
943b0830 | 39 | #include <linux/hwmon.h> |
709439a2 | 40 | #include <linux/hwmon-sysfs.h> |
943b0830 | 41 | #include <linux/err.h> |
9a61bf63 | 42 | #include <linux/mutex.h> |
1da177e4 LT |
43 | |
44 | /* How many retries on register read error */ | |
45 | #define MAX_RETRIES 5 | |
46 | ||
47 | /* | |
48 | * Address to scan | |
49 | * Address is fully defined internally and cannot be changed. | |
50 | */ | |
51 | ||
25e9c86d | 52 | static const unsigned short normal_i2c[] = { 0x2e, I2C_CLIENT_END }; |
1da177e4 LT |
53 | |
54 | /* | |
55 | * Insmod parameters | |
56 | */ | |
57 | ||
f4b50261 | 58 | I2C_CLIENT_INSMOD_1(w83l785ts); |
1da177e4 LT |
59 | |
60 | /* | |
61 | * The W83L785TS-S registers | |
62 | * Manufacturer ID is 0x5CA3 for Winbond. | |
63 | */ | |
64 | ||
65 | #define W83L785TS_REG_MAN_ID1 0x4D | |
66 | #define W83L785TS_REG_MAN_ID2 0x4C | |
67 | #define W83L785TS_REG_CHIP_ID 0x4E | |
68 | #define W83L785TS_REG_CONFIG 0x40 | |
69 | #define W83L785TS_REG_TYPE 0x52 | |
70 | #define W83L785TS_REG_TEMP 0x27 | |
71 | #define W83L785TS_REG_TEMP_OVER 0x53 /* not sure about this one */ | |
72 | ||
73 | /* | |
74 | * Conversions | |
75 | * The W83L785TS-S uses signed 8-bit values. | |
76 | */ | |
77 | ||
cb929eae | 78 | #define TEMP_FROM_REG(val) ((val) * 1000) |
1da177e4 LT |
79 | |
80 | /* | |
81 | * Functions declaration | |
82 | */ | |
83 | ||
dc18a418 JD |
84 | static int w83l785ts_probe(struct i2c_client *client, |
85 | const struct i2c_device_id *id); | |
86 | static int w83l785ts_detect(struct i2c_client *client, int kind, | |
87 | struct i2c_board_info *info); | |
88 | static int w83l785ts_remove(struct i2c_client *client); | |
1da177e4 LT |
89 | static u8 w83l785ts_read_value(struct i2c_client *client, u8 reg, u8 defval); |
90 | static struct w83l785ts_data *w83l785ts_update_device(struct device *dev); | |
91 | ||
92 | /* | |
93 | * Driver data (common to all clients) | |
94 | */ | |
95 | ||
dc18a418 JD |
96 | static const struct i2c_device_id w83l785ts_id[] = { |
97 | { "w83l785ts", w83l785ts }, | |
98 | { } | |
99 | }; | |
100 | MODULE_DEVICE_TABLE(i2c, w83l785ts_id); | |
101 | ||
1da177e4 | 102 | static struct i2c_driver w83l785ts_driver = { |
dc18a418 | 103 | .class = I2C_CLASS_HWMON, |
cdaf7934 | 104 | .driver = { |
cdaf7934 LR |
105 | .name = "w83l785ts", |
106 | }, | |
dc18a418 JD |
107 | .probe = w83l785ts_probe, |
108 | .remove = w83l785ts_remove, | |
109 | .id_table = w83l785ts_id, | |
110 | .detect = w83l785ts_detect, | |
111 | .address_data = &addr_data, | |
1da177e4 LT |
112 | }; |
113 | ||
114 | /* | |
115 | * Client data (each client gets its own) | |
116 | */ | |
117 | ||
118 | struct w83l785ts_data { | |
1beeffe4 | 119 | struct device *hwmon_dev; |
9a61bf63 | 120 | struct mutex update_lock; |
1da177e4 LT |
121 | char valid; /* zero until following fields are valid */ |
122 | unsigned long last_updated; /* in jiffies */ | |
123 | ||
124 | /* registers values */ | |
cb929eae | 125 | s8 temp[2]; /* 0: input |
709439a2 | 126 | 1: critical limit */ |
1da177e4 LT |
127 | }; |
128 | ||
129 | /* | |
130 | * Sysfs stuff | |
131 | */ | |
132 | ||
709439a2 JD |
133 | static ssize_t show_temp(struct device *dev, struct device_attribute *devattr, |
134 | char *buf) | |
1da177e4 | 135 | { |
709439a2 | 136 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
1da177e4 | 137 | struct w83l785ts_data *data = w83l785ts_update_device(dev); |
709439a2 | 138 | return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index])); |
1da177e4 LT |
139 | } |
140 | ||
709439a2 JD |
141 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0); |
142 | static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_temp, NULL, 1); | |
1da177e4 LT |
143 | |
144 | /* | |
145 | * Real code | |
146 | */ | |
147 | ||
dc18a418 | 148 | /* Return 0 if detection is successful, -ENODEV otherwise */ |
a1fa4cdc | 149 | static int w83l785ts_detect(struct i2c_client *client, int kind, |
dc18a418 | 150 | struct i2c_board_info *info) |
1da177e4 | 151 | { |
a1fa4cdc JD |
152 | struct i2c_adapter *adapter = client->adapter; |
153 | u16 man_id; | |
154 | u8 chip_id; | |
1da177e4 LT |
155 | |
156 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) | |
dc18a418 | 157 | return -ENODEV; |
1da177e4 | 158 | |
a1fa4cdc JD |
159 | /* detection */ |
160 | if ((w83l785ts_read_value(client, W83L785TS_REG_CONFIG, 0) & 0x80) | |
161 | || (w83l785ts_read_value(client, W83L785TS_REG_TYPE, 0) & 0xFC)) { | |
162 | dev_dbg(&adapter->dev, | |
163 | "W83L785TS-S detection failed at 0x%02x\n", | |
164 | client->addr); | |
165 | return -ENODEV; | |
1da177e4 LT |
166 | } |
167 | ||
a1fa4cdc JD |
168 | /* Identification */ |
169 | man_id = (w83l785ts_read_value(client, W83L785TS_REG_MAN_ID1, 0) << 8) | |
170 | + w83l785ts_read_value(client, W83L785TS_REG_MAN_ID2, 0); | |
171 | chip_id = w83l785ts_read_value(client, W83L785TS_REG_CHIP_ID, 0); | |
172 | ||
173 | if (man_id != 0x5CA3 /* Winbond */ | |
174 | || chip_id != 0x70) { /* W83L785TS-S */ | |
175 | dev_dbg(&adapter->dev, | |
176 | "Unsupported chip (man_id=0x%04X, chip_id=0x%02X)\n", | |
177 | man_id, chip_id); | |
178 | return -ENODEV; | |
1da177e4 LT |
179 | } |
180 | ||
dc18a418 JD |
181 | strlcpy(info->type, "w83l785ts", I2C_NAME_SIZE); |
182 | ||
183 | return 0; | |
184 | } | |
185 | ||
186 | static int w83l785ts_probe(struct i2c_client *new_client, | |
187 | const struct i2c_device_id *id) | |
188 | { | |
189 | struct w83l785ts_data *data; | |
190 | int err = 0; | |
191 | ||
192 | data = kzalloc(sizeof(struct w83l785ts_data), GFP_KERNEL); | |
193 | if (!data) { | |
194 | err = -ENOMEM; | |
195 | goto exit; | |
196 | } | |
197 | ||
198 | i2c_set_clientdata(new_client, data); | |
1da177e4 | 199 | data->valid = 0; |
9a61bf63 | 200 | mutex_init(&data->update_lock); |
1da177e4 LT |
201 | |
202 | /* Default values in case the first read fails (unlikely). */ | |
709439a2 | 203 | data->temp[1] = data->temp[0] = 0; |
1da177e4 | 204 | |
1da177e4 LT |
205 | /* |
206 | * Initialize the W83L785TS chip | |
207 | * Nothing yet, assume it is already started. | |
208 | */ | |
209 | ||
ccc5c306 RM |
210 | err = device_create_file(&new_client->dev, |
211 | &sensor_dev_attr_temp1_input.dev_attr); | |
212 | if (err) | |
213 | goto exit_remove; | |
214 | ||
215 | err = device_create_file(&new_client->dev, | |
216 | &sensor_dev_attr_temp1_max.dev_attr); | |
217 | if (err) | |
218 | goto exit_remove; | |
219 | ||
1da177e4 | 220 | /* Register sysfs hooks */ |
1beeffe4 TJ |
221 | data->hwmon_dev = hwmon_device_register(&new_client->dev); |
222 | if (IS_ERR(data->hwmon_dev)) { | |
223 | err = PTR_ERR(data->hwmon_dev); | |
ccc5c306 | 224 | goto exit_remove; |
943b0830 MH |
225 | } |
226 | ||
1da177e4 LT |
227 | return 0; |
228 | ||
ccc5c306 RM |
229 | exit_remove: |
230 | device_remove_file(&new_client->dev, | |
231 | &sensor_dev_attr_temp1_input.dev_attr); | |
232 | device_remove_file(&new_client->dev, | |
233 | &sensor_dev_attr_temp1_max.dev_attr); | |
1da177e4 LT |
234 | kfree(data); |
235 | exit: | |
236 | return err; | |
237 | } | |
238 | ||
dc18a418 | 239 | static int w83l785ts_remove(struct i2c_client *client) |
1da177e4 | 240 | { |
943b0830 | 241 | struct w83l785ts_data *data = i2c_get_clientdata(client); |
1da177e4 | 242 | |
1beeffe4 | 243 | hwmon_device_unregister(data->hwmon_dev); |
ccc5c306 RM |
244 | device_remove_file(&client->dev, |
245 | &sensor_dev_attr_temp1_input.dev_attr); | |
246 | device_remove_file(&client->dev, | |
247 | &sensor_dev_attr_temp1_max.dev_attr); | |
1da177e4 | 248 | |
943b0830 | 249 | kfree(data); |
1da177e4 LT |
250 | return 0; |
251 | } | |
252 | ||
253 | static u8 w83l785ts_read_value(struct i2c_client *client, u8 reg, u8 defval) | |
254 | { | |
255 | int value, i; | |
dc18a418 JD |
256 | struct device *dev; |
257 | const char *prefix; | |
258 | ||
259 | /* We might be called during detection, at which point the client | |
260 | isn't yet fully initialized, so we can't use dev_dbg on it */ | |
261 | if (i2c_get_clientdata(client)) { | |
262 | dev = &client->dev; | |
263 | prefix = ""; | |
264 | } else { | |
265 | dev = &client->adapter->dev; | |
266 | prefix = "w83l785ts: "; | |
267 | } | |
1da177e4 LT |
268 | |
269 | /* Frequent read errors have been reported on Asus boards, so we | |
270 | * retry on read errors. If it still fails (unlikely), return the | |
271 | * default value requested by the caller. */ | |
272 | for (i = 1; i <= MAX_RETRIES; i++) { | |
273 | value = i2c_smbus_read_byte_data(client, reg); | |
274 | if (value >= 0) { | |
dc18a418 JD |
275 | dev_dbg(dev, "%sRead 0x%02x from register 0x%02x.\n", |
276 | prefix, value, reg); | |
1da177e4 LT |
277 | return value; |
278 | } | |
dc18a418 | 279 | dev_dbg(dev, "%sRead failed, will retry in %d.\n", prefix, i); |
1da177e4 LT |
280 | msleep(i); |
281 | } | |
282 | ||
dc18a418 | 283 | dev_err(dev, "%sCouldn't read value from register 0x%02x.\n", prefix, |
4040c415 | 284 | reg); |
1da177e4 LT |
285 | return defval; |
286 | } | |
287 | ||
288 | static struct w83l785ts_data *w83l785ts_update_device(struct device *dev) | |
289 | { | |
290 | struct i2c_client *client = to_i2c_client(dev); | |
291 | struct w83l785ts_data *data = i2c_get_clientdata(client); | |
292 | ||
9a61bf63 | 293 | mutex_lock(&data->update_lock); |
1da177e4 LT |
294 | |
295 | if (!data->valid || time_after(jiffies, data->last_updated + HZ * 2)) { | |
296 | dev_dbg(&client->dev, "Updating w83l785ts data.\n"); | |
709439a2 JD |
297 | data->temp[0] = w83l785ts_read_value(client, |
298 | W83L785TS_REG_TEMP, data->temp[0]); | |
299 | data->temp[1] = w83l785ts_read_value(client, | |
300 | W83L785TS_REG_TEMP_OVER, data->temp[1]); | |
1da177e4 LT |
301 | |
302 | data->last_updated = jiffies; | |
303 | data->valid = 1; | |
304 | } | |
305 | ||
9a61bf63 | 306 | mutex_unlock(&data->update_lock); |
1da177e4 LT |
307 | |
308 | return data; | |
309 | } | |
310 | ||
311 | static int __init sensors_w83l785ts_init(void) | |
312 | { | |
313 | return i2c_add_driver(&w83l785ts_driver); | |
314 | } | |
315 | ||
316 | static void __exit sensors_w83l785ts_exit(void) | |
317 | { | |
318 | i2c_del_driver(&w83l785ts_driver); | |
319 | } | |
320 | ||
321 | MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>"); | |
322 | MODULE_DESCRIPTION("W83L785TS-S driver"); | |
323 | MODULE_LICENSE("GPL"); | |
324 | ||
325 | module_init(sensors_w83l785ts_init); | |
326 | module_exit(sensors_w83l785ts_exit); |