2 adm1021.c - Part of lm_sensors, Linux kernel modules for hardware
4 Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl> and
5 Philip Edelbrock <phil@netroedge.com>
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 #include <linux/config.h>
23 #include <linux/module.h>
24 #include <linux/init.h>
25 #include <linux/slab.h>
26 #include <linux/i2c.h>
27 #include <linux/i2c-sensor.h>
31 #define ADM1021_SYSCTL_TEMP 1200
32 #define ADM1021_SYSCTL_REMOTE_TEMP 1201
33 #define ADM1021_SYSCTL_DIE_CODE 1202
34 #define ADM1021_SYSCTL_ALARMS 1203
36 #define ADM1021_ALARM_TEMP_HIGH 0x40
37 #define ADM1021_ALARM_TEMP_LOW 0x20
38 #define ADM1021_ALARM_RTEMP_HIGH 0x10
39 #define ADM1021_ALARM_RTEMP_LOW 0x08
40 #define ADM1021_ALARM_RTEMP_NA 0x04
42 /* Addresses to scan */
43 static unsigned short normal_i2c[] = { 0x18, 0x19, 0x1a,
47 static unsigned int normal_isa[] = { I2C_CLIENT_ISA_END };
49 /* Insmod parameters */
50 SENSORS_INSMOD_8(adm1021, adm1023, max1617, max1617a, thmc10, lm84, gl523sm, mc1066);
52 /* adm1021 constants specified below */
54 /* The adm1021 registers */
56 #define ADM1021_REG_TEMP 0x00
57 #define ADM1021_REG_REMOTE_TEMP 0x01
58 #define ADM1021_REG_STATUS 0x02
59 #define ADM1021_REG_MAN_ID 0x0FE /* 0x41 = AMD, 0x49 = TI, 0x4D = Maxim, 0x23 = Genesys , 0x54 = Onsemi*/
60 #define ADM1021_REG_DEV_ID 0x0FF /* ADM1021 = 0x0X, ADM1023 = 0x3X */
61 #define ADM1021_REG_DIE_CODE 0x0FF /* MAX1617A */
62 /* These use different addresses for reading/writing */
63 #define ADM1021_REG_CONFIG_R 0x03
64 #define ADM1021_REG_CONFIG_W 0x09
65 #define ADM1021_REG_CONV_RATE_R 0x04
66 #define ADM1021_REG_CONV_RATE_W 0x0A
67 /* These are for the ADM1023's additional precision on the remote temp sensor */
68 #define ADM1021_REG_REM_TEMP_PREC 0x010
69 #define ADM1021_REG_REM_OFFSET 0x011
70 #define ADM1021_REG_REM_OFFSET_PREC 0x012
71 #define ADM1021_REG_REM_TOS_PREC 0x013
72 #define ADM1021_REG_REM_THYST_PREC 0x014
74 #define ADM1021_REG_TOS_R 0x05
75 #define ADM1021_REG_TOS_W 0x0B
76 #define ADM1021_REG_REMOTE_TOS_R 0x07
77 #define ADM1021_REG_REMOTE_TOS_W 0x0D
78 #define ADM1021_REG_THYST_R 0x06
79 #define ADM1021_REG_THYST_W 0x0C
80 #define ADM1021_REG_REMOTE_THYST_R 0x08
81 #define ADM1021_REG_REMOTE_THYST_W 0x0E
83 #define ADM1021_REG_ONESHOT 0x0F
86 /* Conversions. Rounding and limit checking is only done on the TO_REG
87 variants. Note that you should be a bit careful with which arguments
88 these macros are called: arguments may be evaluated more than once.
89 Fixing this is just not worth it. */
90 /* Conversions note: 1021 uses normal integer signed-byte format*/
91 #define TEMP_FROM_REG(val) (val > 127 ? (val-256)*1000 : val*1000)
92 #define TEMP_TO_REG(val) (SENSORS_LIMIT((val < 0 ? (val/1000)+256 : val/1000),0,255))
96 /* Note: Even though I left the low and high limits named os and hyst,
97 they don't quite work like a thermostat the way the LM75 does. I.e.,
98 a lower temp than THYST actually triggers an alarm instead of
99 clearing it. Weird, ey? --Phil */
101 /* Each client has this additional data */
102 struct adm1021_data {
103 struct i2c_client client;
106 struct semaphore update_lock;
107 char valid; /* !=0 if following fields are valid */
108 unsigned long last_updated; /* In jiffies */
110 u8 temp_max; /* Register values */
115 u8 remote_temp_input;
117 /* special values for ADM1021 only */
119 /* Special values for ADM1023 only */
121 u8 remote_temp_os_prec;
122 u8 remote_temp_hyst_prec;
123 u8 remote_temp_offset;
124 u8 remote_temp_offset_prec;
127 static int adm1021_attach_adapter(struct i2c_adapter *adapter);
128 static int adm1021_detect(struct i2c_adapter *adapter, int address, int kind);
129 static void adm1021_init_client(struct i2c_client *client);
130 static int adm1021_detach_client(struct i2c_client *client);
131 static int adm1021_read_value(struct i2c_client *client, u8 reg);
132 static int adm1021_write_value(struct i2c_client *client, u8 reg,
134 static struct adm1021_data *adm1021_update_device(struct device *dev);
136 /* (amalysh) read only mode, otherwise any limit's writing confuse BIOS */
137 static int read_only = 0;
140 /* This is the driver that will be inserted */
141 static struct i2c_driver adm1021_driver = {
142 .owner = THIS_MODULE,
144 .id = I2C_DRIVERID_ADM1021,
145 .flags = I2C_DF_NOTIFY,
146 .attach_adapter = adm1021_attach_adapter,
147 .detach_client = adm1021_detach_client,
150 static int adm1021_id;
152 #define show(value) \
153 static ssize_t show_##value(struct device *dev, char *buf) \
155 struct adm1021_data *data = adm1021_update_device(dev); \
156 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->value)); \
161 show(remote_temp_max);
162 show(remote_temp_hyst);
163 show(remote_temp_input);
165 #define show2(value) \
166 static ssize_t show_##value(struct device *dev, char *buf) \
168 struct adm1021_data *data = adm1021_update_device(dev); \
169 return sprintf(buf, "%d\n", data->value); \
174 #define set(value, reg) \
175 static ssize_t set_##value(struct device *dev, const char *buf, size_t count) \
177 struct i2c_client *client = to_i2c_client(dev); \
178 struct adm1021_data *data = i2c_get_clientdata(client); \
179 int temp = simple_strtoul(buf, NULL, 10); \
181 data->value = TEMP_TO_REG(temp); \
182 adm1021_write_value(client, reg, data->value); \
185 set(temp_max, ADM1021_REG_TOS_W);
186 set(temp_hyst, ADM1021_REG_THYST_W);
187 set(remote_temp_max, ADM1021_REG_REMOTE_TOS_W);
188 set(remote_temp_hyst, ADM1021_REG_REMOTE_THYST_W);
190 static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_max, set_temp_max);
191 static DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp_hyst, set_temp_hyst);
192 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input, NULL);
193 static DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_remote_temp_max, set_remote_temp_max);
194 static DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_remote_temp_hyst, set_remote_temp_hyst);
195 static DEVICE_ATTR(temp2_input, S_IRUGO, show_remote_temp_input, NULL);
196 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
197 static DEVICE_ATTR(die_code, S_IRUGO, show_die_code, NULL);
200 static int adm1021_attach_adapter(struct i2c_adapter *adapter)
202 if (!(adapter->class & I2C_CLASS_HWMON))
204 return i2c_detect(adapter, &addr_data, adm1021_detect);
207 static int adm1021_detect(struct i2c_adapter *adapter, int address, int kind)
210 struct i2c_client *new_client;
211 struct adm1021_data *data;
213 const char *type_name = "";
215 /* Make sure we aren't probing the ISA bus!! This is just a safety check
216 at this moment; i2c_detect really won't call us. */
218 if (i2c_is_isa_adapter(adapter)) {
219 dev_dbg(&adapter->dev, "adm1021_detect called for an ISA bus adapter?!?\n");
224 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
227 /* OK. For now, we presume we have a valid client. We now create the
228 client structure, even though we cannot fill it completely yet.
229 But it allows us to access adm1021_{read,write}_value. */
231 if (!(data = kmalloc(sizeof(struct adm1021_data), GFP_KERNEL))) {
235 memset(data, 0, sizeof(struct adm1021_data));
237 new_client = &data->client;
238 i2c_set_clientdata(new_client, data);
239 new_client->addr = address;
240 new_client->adapter = adapter;
241 new_client->driver = &adm1021_driver;
242 new_client->flags = 0;
244 /* Now, we do the remaining detection. */
246 if ((adm1021_read_value(new_client, ADM1021_REG_STATUS) & 0x03) != 0x00
247 || (adm1021_read_value(new_client, ADM1021_REG_CONFIG_R) & 0x3F) != 0x00
248 || (adm1021_read_value(new_client, ADM1021_REG_CONV_RATE_R) & 0xF8) != 0x00) {
254 /* Determine the chip type. */
256 i = adm1021_read_value(new_client, ADM1021_REG_MAN_ID);
258 if ((adm1021_read_value(new_client, ADM1021_REG_DEV_ID) & 0x0F0) == 0x030)
266 else if ((i == 0x4d) &&
267 (adm1021_read_value(new_client, ADM1021_REG_DEV_ID) == 0x01))
271 /* LM84 Mfr ID in a different place, and it has more unused bits */
272 else if (adm1021_read_value(new_client, ADM1021_REG_CONV_RATE_R) == 0x00
273 && (kind == 0 /* skip extra detection */
274 || ((adm1021_read_value(new_client, ADM1021_REG_CONFIG_R) & 0x7F) == 0x00
275 && (adm1021_read_value(new_client, ADM1021_REG_STATUS) & 0xAB) == 0x00)))
281 if (kind == max1617) {
282 type_name = "max1617";
283 } else if (kind == max1617a) {
284 type_name = "max1617a";
285 } else if (kind == adm1021) {
286 type_name = "adm1021";
287 } else if (kind == adm1023) {
288 type_name = "adm1023";
289 } else if (kind == thmc10) {
290 type_name = "thmc10";
291 } else if (kind == lm84) {
293 } else if (kind == gl523sm) {
294 type_name = "gl523sm";
295 } else if (kind == mc1066) {
296 type_name = "mc1066";
299 /* Fill in the remaining client fields and put it into the global list */
300 strlcpy(new_client->name, type_name, I2C_NAME_SIZE);
303 new_client->id = adm1021_id++;
305 init_MUTEX(&data->update_lock);
307 /* Tell the I2C layer a new client has arrived */
308 if ((err = i2c_attach_client(new_client)))
311 /* Initialize the ADM1021 chip */
313 adm1021_init_client(new_client);
315 /* Register sysfs hooks */
316 device_create_file(&new_client->dev, &dev_attr_temp1_max);
317 device_create_file(&new_client->dev, &dev_attr_temp1_min);
318 device_create_file(&new_client->dev, &dev_attr_temp1_input);
319 device_create_file(&new_client->dev, &dev_attr_temp2_max);
320 device_create_file(&new_client->dev, &dev_attr_temp2_min);
321 device_create_file(&new_client->dev, &dev_attr_temp2_input);
322 device_create_file(&new_client->dev, &dev_attr_alarms);
323 if (data->type == adm1021)
324 device_create_file(&new_client->dev, &dev_attr_die_code);
334 static void adm1021_init_client(struct i2c_client *client)
336 /* Enable ADC and disable suspend mode */
337 adm1021_write_value(client, ADM1021_REG_CONFIG_W,
338 adm1021_read_value(client, ADM1021_REG_CONFIG_R) & 0xBF);
339 /* Set Conversion rate to 1/sec (this can be tinkered with) */
340 adm1021_write_value(client, ADM1021_REG_CONV_RATE_W, 0x04);
343 static int adm1021_detach_client(struct i2c_client *client)
347 if ((err = i2c_detach_client(client))) {
348 dev_err(&client->dev, "Client deregistration failed, client not detached.\n");
352 kfree(i2c_get_clientdata(client));
356 /* All registers are byte-sized */
357 static int adm1021_read_value(struct i2c_client *client, u8 reg)
359 return i2c_smbus_read_byte_data(client, reg);
362 static int adm1021_write_value(struct i2c_client *client, u8 reg, u16 value)
365 return i2c_smbus_write_byte_data(client, reg, value);
369 static struct adm1021_data *adm1021_update_device(struct device *dev)
371 struct i2c_client *client = to_i2c_client(dev);
372 struct adm1021_data *data = i2c_get_clientdata(client);
374 down(&data->update_lock);
376 if ((jiffies - data->last_updated > HZ + HZ / 2) ||
377 (jiffies < data->last_updated) || !data->valid) {
378 dev_dbg(&client->dev, "Starting adm1021 update\n");
380 data->temp_input = adm1021_read_value(client, ADM1021_REG_TEMP);
381 data->temp_max = adm1021_read_value(client, ADM1021_REG_TOS_R);
382 data->temp_hyst = adm1021_read_value(client, ADM1021_REG_THYST_R);
383 data->remote_temp_input = adm1021_read_value(client, ADM1021_REG_REMOTE_TEMP);
384 data->remote_temp_max = adm1021_read_value(client, ADM1021_REG_REMOTE_TOS_R);
385 data->remote_temp_hyst = adm1021_read_value(client, ADM1021_REG_REMOTE_THYST_R);
386 data->alarms = adm1021_read_value(client, ADM1021_REG_STATUS) & 0xec;
387 if (data->type == adm1021)
388 data->die_code = adm1021_read_value(client, ADM1021_REG_DIE_CODE);
389 if (data->type == adm1023) {
390 data->remote_temp_prec = adm1021_read_value(client, ADM1021_REG_REM_TEMP_PREC);
391 data->remote_temp_os_prec = adm1021_read_value(client, ADM1021_REG_REM_TOS_PREC);
392 data->remote_temp_hyst_prec = adm1021_read_value(client, ADM1021_REG_REM_THYST_PREC);
393 data->remote_temp_offset = adm1021_read_value(client, ADM1021_REG_REM_OFFSET);
394 data->remote_temp_offset_prec = adm1021_read_value(client, ADM1021_REG_REM_OFFSET_PREC);
396 data->last_updated = jiffies;
400 up(&data->update_lock);
405 static int __init sensors_adm1021_init(void)
407 return i2c_add_driver(&adm1021_driver);
410 static void __exit sensors_adm1021_exit(void)
412 i2c_del_driver(&adm1021_driver);
415 MODULE_AUTHOR ("Frodo Looijaard <frodol@dds.nl> and "
416 "Philip Edelbrock <phil@netroedge.com>");
417 MODULE_DESCRIPTION("adm1021 driver");
418 MODULE_LICENSE("GPL");
420 module_param(read_only, bool, 0);
421 MODULE_PARM_DESC(read_only, "Don't set any values, read only mode");
423 module_init(sensors_adm1021_init)
424 module_exit(sensors_adm1021_exit)