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1/*
2 * Driver for the ADT7411 (I2C/SPI 8 channel 10 bit ADC & temperature-sensor)
3 *
4 * Copyright (C) 2008, 2010 Pengutronix
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 version 2 as
8 * published by the Free Software Foundation.
9 *
10 * TODO: SPI, support for external temperature sensor
11 * use power-down mode for suspend?, interrupt handling?
12 */
13
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/init.h>
17#include <linux/err.h>
18#include <linux/mutex.h>
19#include <linux/jiffies.h>
20#include <linux/i2c.h>
21#include <linux/hwmon.h>
22#include <linux/hwmon-sysfs.h>
23#include <linux/slab.h>
24
25#define ADT7411_REG_INT_TEMP_VDD_LSB 0x03
26#define ADT7411_REG_EXT_TEMP_AIN14_LSB 0x04
27#define ADT7411_REG_VDD_MSB 0x06
28#define ADT7411_REG_INT_TEMP_MSB 0x07
29#define ADT7411_REG_EXT_TEMP_AIN1_MSB 0x08
30
31#define ADT7411_REG_CFG1 0x18
32#define ADT7411_CFG1_START_MONITOR (1 << 0)
33
34#define ADT7411_REG_CFG2 0x19
35#define ADT7411_CFG2_DISABLE_AVG (1 << 5)
36
37#define ADT7411_REG_CFG3 0x1a
38#define ADT7411_CFG3_ADC_CLK_225 (1 << 0)
39#define ADT7411_CFG3_REF_VDD (1 << 4)
40
41#define ADT7411_REG_DEVICE_ID 0x4d
42#define ADT7411_REG_MANUFACTURER_ID 0x4e
43
44#define ADT7411_DEVICE_ID 0x2
45#define ADT7411_MANUFACTURER_ID 0x41
46
47static const unsigned short normal_i2c[] = { 0x48, 0x4a, 0x4b, I2C_CLIENT_END };
48
49struct adt7411_data {
50 struct mutex device_lock; /* for "atomic" device accesses */
51 struct mutex update_lock;
52 unsigned long next_update;
53 int vref_cached;
54 struct i2c_client *client;
55};
56
57/*
58 * When reading a register containing (up to 4) lsb, all associated
59 * msb-registers get locked by the hardware. After _one_ of those msb is read,
60 * _all_ are unlocked. In order to use this locking correctly, reading lsb/msb
61 * is protected here with a mutex, too.
62 */
63static int adt7411_read_10_bit(struct i2c_client *client, u8 lsb_reg,
64 u8 msb_reg, u8 lsb_shift)
65{
66 struct adt7411_data *data = i2c_get_clientdata(client);
67 int val, tmp;
68
69 mutex_lock(&data->device_lock);
70
71 val = i2c_smbus_read_byte_data(client, lsb_reg);
72 if (val < 0)
73 goto exit_unlock;
74
75 tmp = (val >> lsb_shift) & 3;
76 val = i2c_smbus_read_byte_data(client, msb_reg);
77
78 if (val >= 0)
79 val = (val << 2) | tmp;
80
81 exit_unlock:
82 mutex_unlock(&data->device_lock);
83
84 return val;
85}
86
87static int adt7411_modify_bit(struct i2c_client *client, u8 reg, u8 bit,
88 bool flag)
89{
90 struct adt7411_data *data = i2c_get_clientdata(client);
91 int ret, val;
92
93 mutex_lock(&data->device_lock);
94
95 ret = i2c_smbus_read_byte_data(client, reg);
96 if (ret < 0)
97 goto exit_unlock;
98
99 if (flag)
100 val = ret | bit;
101 else
102 val = ret & ~bit;
103
104 ret = i2c_smbus_write_byte_data(client, reg, val);
105
106 exit_unlock:
107 mutex_unlock(&data->device_lock);
108 return ret;
109}
110
111static ssize_t adt7411_show_vdd(struct device *dev,
112 struct device_attribute *attr, char *buf)
113{
114 struct adt7411_data *data = dev_get_drvdata(dev);
115 struct i2c_client *client = data->client;
116 int ret = adt7411_read_10_bit(client, ADT7411_REG_INT_TEMP_VDD_LSB,
117 ADT7411_REG_VDD_MSB, 2);
118
119 return ret < 0 ? ret : sprintf(buf, "%u\n", ret * 7000 / 1024);
120}
121
122static ssize_t adt7411_show_temp(struct device *dev,
123 struct device_attribute *attr, char *buf)
124{
125 struct adt7411_data *data = dev_get_drvdata(dev);
126 struct i2c_client *client = data->client;
127 int val = adt7411_read_10_bit(client, ADT7411_REG_INT_TEMP_VDD_LSB,
128 ADT7411_REG_INT_TEMP_MSB, 0);
129
130 if (val < 0)
131 return val;
132
133 val = val & 0x200 ? val - 0x400 : val; /* 10 bit signed */
134
135 return sprintf(buf, "%d\n", val * 250);
136}
137
138static ssize_t adt7411_show_input(struct device *dev,
139 struct device_attribute *attr, char *buf)
140{
141 int nr = to_sensor_dev_attr(attr)->index;
142 struct adt7411_data *data = dev_get_drvdata(dev);
143 struct i2c_client *client = data->client;
144 int val;
145 u8 lsb_reg, lsb_shift;
146
147 mutex_lock(&data->update_lock);
148 if (time_after_eq(jiffies, data->next_update)) {
149 val = i2c_smbus_read_byte_data(client, ADT7411_REG_CFG3);
150 if (val < 0)
151 goto exit_unlock;
152
153 if (val & ADT7411_CFG3_REF_VDD) {
154 val = adt7411_read_10_bit(client,
155 ADT7411_REG_INT_TEMP_VDD_LSB,
156 ADT7411_REG_VDD_MSB, 2);
157 if (val < 0)
158 goto exit_unlock;
159
160 data->vref_cached = val * 7000 / 1024;
161 } else {
162 data->vref_cached = 2250;
163 }
164
165 data->next_update = jiffies + HZ;
166 }
167
168 lsb_reg = ADT7411_REG_EXT_TEMP_AIN14_LSB + (nr >> 2);
169 lsb_shift = 2 * (nr & 0x03);
170 val = adt7411_read_10_bit(client, lsb_reg,
171 ADT7411_REG_EXT_TEMP_AIN1_MSB + nr, lsb_shift);
172 if (val < 0)
173 goto exit_unlock;
174
175 val = sprintf(buf, "%u\n", val * data->vref_cached / 1024);
176 exit_unlock:
177 mutex_unlock(&data->update_lock);
178 return val;
179}
180
181static ssize_t adt7411_show_bit(struct device *dev,
182 struct device_attribute *attr, char *buf)
183{
184 struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(attr);
185 struct adt7411_data *data = dev_get_drvdata(dev);
186 struct i2c_client *client = data->client;
187 int ret = i2c_smbus_read_byte_data(client, attr2->index);
188
189 return ret < 0 ? ret : sprintf(buf, "%u\n", !!(ret & attr2->nr));
190}
191
192static ssize_t adt7411_set_bit(struct device *dev,
193 struct device_attribute *attr, const char *buf,
194 size_t count)
195{
196 struct sensor_device_attribute_2 *s_attr2 = to_sensor_dev_attr_2(attr);
197 struct adt7411_data *data = dev_get_drvdata(dev);
198 struct i2c_client *client = data->client;
199 int ret;
200 unsigned long flag;
201
202 ret = kstrtoul(buf, 0, &flag);
203 if (ret || flag > 1)
204 return -EINVAL;
205
206 ret = adt7411_modify_bit(client, s_attr2->index, s_attr2->nr, flag);
207
208 /* force update */
209 mutex_lock(&data->update_lock);
210 data->next_update = jiffies;
211 mutex_unlock(&data->update_lock);
212
213 return ret < 0 ? ret : count;
214}
215
216#define ADT7411_BIT_ATTR(__name, __reg, __bit) \
217 SENSOR_DEVICE_ATTR_2(__name, S_IRUGO | S_IWUSR, adt7411_show_bit, \
218 adt7411_set_bit, __bit, __reg)
219
220static DEVICE_ATTR(temp1_input, S_IRUGO, adt7411_show_temp, NULL);
221static DEVICE_ATTR(in0_input, S_IRUGO, adt7411_show_vdd, NULL);
222static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, adt7411_show_input, NULL, 0);
223static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, adt7411_show_input, NULL, 1);
224static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, adt7411_show_input, NULL, 2);
225static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, adt7411_show_input, NULL, 3);
226static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, adt7411_show_input, NULL, 4);
227static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, adt7411_show_input, NULL, 5);
228static SENSOR_DEVICE_ATTR(in7_input, S_IRUGO, adt7411_show_input, NULL, 6);
229static SENSOR_DEVICE_ATTR(in8_input, S_IRUGO, adt7411_show_input, NULL, 7);
230static ADT7411_BIT_ATTR(no_average, ADT7411_REG_CFG2, ADT7411_CFG2_DISABLE_AVG);
231static ADT7411_BIT_ATTR(fast_sampling, ADT7411_REG_CFG3, ADT7411_CFG3_ADC_CLK_225);
232static ADT7411_BIT_ATTR(adc_ref_vdd, ADT7411_REG_CFG3, ADT7411_CFG3_REF_VDD);
233
234static struct attribute *adt7411_attrs[] = {
235 &dev_attr_temp1_input.attr,
236 &dev_attr_in0_input.attr,
237 &sensor_dev_attr_in1_input.dev_attr.attr,
238 &sensor_dev_attr_in2_input.dev_attr.attr,
239 &sensor_dev_attr_in3_input.dev_attr.attr,
240 &sensor_dev_attr_in4_input.dev_attr.attr,
241 &sensor_dev_attr_in5_input.dev_attr.attr,
242 &sensor_dev_attr_in6_input.dev_attr.attr,
243 &sensor_dev_attr_in7_input.dev_attr.attr,
244 &sensor_dev_attr_in8_input.dev_attr.attr,
245 &sensor_dev_attr_no_average.dev_attr.attr,
246 &sensor_dev_attr_fast_sampling.dev_attr.attr,
247 &sensor_dev_attr_adc_ref_vdd.dev_attr.attr,
248 NULL
249};
250
251ATTRIBUTE_GROUPS(adt7411);
252
253static int adt7411_detect(struct i2c_client *client,
254 struct i2c_board_info *info)
255{
256 int val;
257
258 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
259 return -ENODEV;
260
261 val = i2c_smbus_read_byte_data(client, ADT7411_REG_MANUFACTURER_ID);
262 if (val < 0 || val != ADT7411_MANUFACTURER_ID) {
263 dev_dbg(&client->dev,
264 "Wrong manufacturer ID. Got %d, expected %d\n",
265 val, ADT7411_MANUFACTURER_ID);
266 return -ENODEV;
267 }
268
269 val = i2c_smbus_read_byte_data(client, ADT7411_REG_DEVICE_ID);
270 if (val < 0 || val != ADT7411_DEVICE_ID) {
271 dev_dbg(&client->dev,
272 "Wrong device ID. Got %d, expected %d\n",
273 val, ADT7411_DEVICE_ID);
274 return -ENODEV;
275 }
276
277 strlcpy(info->type, "adt7411", I2C_NAME_SIZE);
278
279 return 0;
280}
281
282static int adt7411_probe(struct i2c_client *client,
283 const struct i2c_device_id *id)
284{
285 struct device *dev = &client->dev;
286 struct adt7411_data *data;
287 struct device *hwmon_dev;
288 int ret;
289
290 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
291 if (!data)
292 return -ENOMEM;
293
294 i2c_set_clientdata(client, data);
295 data->client = client;
296 mutex_init(&data->device_lock);
297 mutex_init(&data->update_lock);
298
299 ret = adt7411_modify_bit(client, ADT7411_REG_CFG1,
300 ADT7411_CFG1_START_MONITOR, 1);
301 if (ret < 0)
302 return ret;
303
304 /* force update on first occasion */
305 data->next_update = jiffies;
306
307 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
308 data,
309 adt7411_groups);
310 return PTR_ERR_OR_ZERO(hwmon_dev);
311}
312
313static const struct i2c_device_id adt7411_id[] = {
314 { "adt7411", 0 },
315 { }
316};
317MODULE_DEVICE_TABLE(i2c, adt7411_id);
318
319static struct i2c_driver adt7411_driver = {
320 .driver = {
321 .name = "adt7411",
322 },
323 .probe = adt7411_probe,
324 .id_table = adt7411_id,
325 .detect = adt7411_detect,
326 .address_list = normal_i2c,
327 .class = I2C_CLASS_HWMON,
328};
329
330module_i2c_driver(adt7411_driver);
331
332MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de> and "
333 "Wolfram Sang <w.sang@pengutronix.de>");
334MODULE_DESCRIPTION("ADT7411 driver");
335MODULE_LICENSE("GPL v2");
1/*
2 * Driver for the ADT7411 (I2C/SPI 8 channel 10 bit ADC & temperature-sensor)
3 *
4 * Copyright (C) 2008, 2010 Pengutronix
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 version 2 as
8 * published by the Free Software Foundation.
9 *
10 * TODO: SPI, support for external temperature sensor
11 * use power-down mode for suspend?, interrupt handling?
12 */
13
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/init.h>
17#include <linux/err.h>
18#include <linux/delay.h>
19#include <linux/mutex.h>
20#include <linux/jiffies.h>
21#include <linux/i2c.h>
22#include <linux/hwmon.h>
23#include <linux/hwmon-sysfs.h>
24#include <linux/slab.h>
25
26#define ADT7411_REG_INT_TEMP_VDD_LSB 0x03
27#define ADT7411_REG_EXT_TEMP_AIN14_LSB 0x04
28#define ADT7411_REG_VDD_MSB 0x06
29#define ADT7411_REG_INT_TEMP_MSB 0x07
30#define ADT7411_REG_EXT_TEMP_AIN1_MSB 0x08
31
32#define ADT7411_REG_CFG1 0x18
33#define ADT7411_CFG1_START_MONITOR (1 << 0)
34
35#define ADT7411_REG_CFG2 0x19
36#define ADT7411_CFG2_DISABLE_AVG (1 << 5)
37
38#define ADT7411_REG_CFG3 0x1a
39#define ADT7411_CFG3_ADC_CLK_225 (1 << 0)
40#define ADT7411_CFG3_REF_VDD (1 << 4)
41
42#define ADT7411_REG_DEVICE_ID 0x4d
43#define ADT7411_REG_MANUFACTURER_ID 0x4e
44
45#define ADT7411_DEVICE_ID 0x2
46#define ADT7411_MANUFACTURER_ID 0x41
47
48static const unsigned short normal_i2c[] = { 0x48, 0x4a, 0x4b, I2C_CLIENT_END };
49
50struct adt7411_data {
51 struct mutex device_lock; /* for "atomic" device accesses */
52 struct mutex update_lock;
53 unsigned long next_update;
54 int vref_cached;
55 struct device *hwmon_dev;
56};
57
58/*
59 * When reading a register containing (up to 4) lsb, all associated
60 * msb-registers get locked by the hardware. After _one_ of those msb is read,
61 * _all_ are unlocked. In order to use this locking correctly, reading lsb/msb
62 * is protected here with a mutex, too.
63 */
64static int adt7411_read_10_bit(struct i2c_client *client, u8 lsb_reg,
65 u8 msb_reg, u8 lsb_shift)
66{
67 struct adt7411_data *data = i2c_get_clientdata(client);
68 int val, tmp;
69
70 mutex_lock(&data->device_lock);
71
72 val = i2c_smbus_read_byte_data(client, lsb_reg);
73 if (val < 0)
74 goto exit_unlock;
75
76 tmp = (val >> lsb_shift) & 3;
77 val = i2c_smbus_read_byte_data(client, msb_reg);
78
79 if (val >= 0)
80 val = (val << 2) | tmp;
81
82 exit_unlock:
83 mutex_unlock(&data->device_lock);
84
85 return val;
86}
87
88static int adt7411_modify_bit(struct i2c_client *client, u8 reg, u8 bit,
89 bool flag)
90{
91 struct adt7411_data *data = i2c_get_clientdata(client);
92 int ret, val;
93
94 mutex_lock(&data->device_lock);
95
96 ret = i2c_smbus_read_byte_data(client, reg);
97 if (ret < 0)
98 goto exit_unlock;
99
100 if (flag)
101 val = ret | bit;
102 else
103 val = ret & ~bit;
104
105 ret = i2c_smbus_write_byte_data(client, reg, val);
106
107 exit_unlock:
108 mutex_unlock(&data->device_lock);
109 return ret;
110}
111
112static ssize_t adt7411_show_vdd(struct device *dev,
113 struct device_attribute *attr, char *buf)
114{
115 struct i2c_client *client = to_i2c_client(dev);
116 int ret = adt7411_read_10_bit(client, ADT7411_REG_INT_TEMP_VDD_LSB,
117 ADT7411_REG_VDD_MSB, 2);
118
119 return ret < 0 ? ret : sprintf(buf, "%u\n", ret * 7000 / 1024);
120}
121
122static ssize_t adt7411_show_temp(struct device *dev,
123 struct device_attribute *attr, char *buf)
124{
125 struct i2c_client *client = to_i2c_client(dev);
126 int val = adt7411_read_10_bit(client, ADT7411_REG_INT_TEMP_VDD_LSB,
127 ADT7411_REG_INT_TEMP_MSB, 0);
128
129 if (val < 0)
130 return val;
131
132 val = val & 0x200 ? val - 0x400 : val; /* 10 bit signed */
133
134 return sprintf(buf, "%d\n", val * 250);
135}
136
137static ssize_t adt7411_show_input(struct device *dev,
138 struct device_attribute *attr, char *buf)
139{
140 int nr = to_sensor_dev_attr(attr)->index;
141 struct i2c_client *client = to_i2c_client(dev);
142 struct adt7411_data *data = i2c_get_clientdata(client);
143 int val;
144 u8 lsb_reg, lsb_shift;
145
146 mutex_lock(&data->update_lock);
147 if (time_after_eq(jiffies, data->next_update)) {
148 val = i2c_smbus_read_byte_data(client, ADT7411_REG_CFG3);
149 if (val < 0)
150 goto exit_unlock;
151
152 if (val & ADT7411_CFG3_REF_VDD) {
153 val = adt7411_read_10_bit(client,
154 ADT7411_REG_INT_TEMP_VDD_LSB,
155 ADT7411_REG_VDD_MSB, 2);
156 if (val < 0)
157 goto exit_unlock;
158
159 data->vref_cached = val * 7000 / 1024;
160 } else {
161 data->vref_cached = 2250;
162 }
163
164 data->next_update = jiffies + HZ;
165 }
166
167 lsb_reg = ADT7411_REG_EXT_TEMP_AIN14_LSB + (nr >> 2);
168 lsb_shift = 2 * (nr & 0x03);
169 val = adt7411_read_10_bit(client, lsb_reg,
170 ADT7411_REG_EXT_TEMP_AIN1_MSB + nr, lsb_shift);
171 if (val < 0)
172 goto exit_unlock;
173
174 val = sprintf(buf, "%u\n", val * data->vref_cached / 1024);
175 exit_unlock:
176 mutex_unlock(&data->update_lock);
177 return val;
178}
179
180static ssize_t adt7411_show_bit(struct device *dev,
181 struct device_attribute *attr, char *buf)
182{
183 struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(attr);
184 struct i2c_client *client = to_i2c_client(dev);
185 int ret = i2c_smbus_read_byte_data(client, attr2->index);
186
187 return ret < 0 ? ret : sprintf(buf, "%u\n", !!(ret & attr2->nr));
188}
189
190static ssize_t adt7411_set_bit(struct device *dev,
191 struct device_attribute *attr, const char *buf,
192 size_t count)
193{
194 struct sensor_device_attribute_2 *s_attr2 = to_sensor_dev_attr_2(attr);
195 struct i2c_client *client = to_i2c_client(dev);
196 struct adt7411_data *data = i2c_get_clientdata(client);
197 int ret;
198 unsigned long flag;
199
200 ret = kstrtoul(buf, 0, &flag);
201 if (ret || flag > 1)
202 return -EINVAL;
203
204 ret = adt7411_modify_bit(client, s_attr2->index, s_attr2->nr, flag);
205
206 /* force update */
207 mutex_lock(&data->update_lock);
208 data->next_update = jiffies;
209 mutex_unlock(&data->update_lock);
210
211 return ret < 0 ? ret : count;
212}
213
214#define ADT7411_BIT_ATTR(__name, __reg, __bit) \
215 SENSOR_DEVICE_ATTR_2(__name, S_IRUGO | S_IWUSR, adt7411_show_bit, \
216 adt7411_set_bit, __bit, __reg)
217
218static DEVICE_ATTR(temp1_input, S_IRUGO, adt7411_show_temp, NULL);
219static DEVICE_ATTR(in0_input, S_IRUGO, adt7411_show_vdd, NULL);
220static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, adt7411_show_input, NULL, 0);
221static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, adt7411_show_input, NULL, 1);
222static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, adt7411_show_input, NULL, 2);
223static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, adt7411_show_input, NULL, 3);
224static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, adt7411_show_input, NULL, 4);
225static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, adt7411_show_input, NULL, 5);
226static SENSOR_DEVICE_ATTR(in7_input, S_IRUGO, adt7411_show_input, NULL, 6);
227static SENSOR_DEVICE_ATTR(in8_input, S_IRUGO, adt7411_show_input, NULL, 7);
228static ADT7411_BIT_ATTR(no_average, ADT7411_REG_CFG2, ADT7411_CFG2_DISABLE_AVG);
229static ADT7411_BIT_ATTR(fast_sampling, ADT7411_REG_CFG3, ADT7411_CFG3_ADC_CLK_225);
230static ADT7411_BIT_ATTR(adc_ref_vdd, ADT7411_REG_CFG3, ADT7411_CFG3_REF_VDD);
231
232static struct attribute *adt7411_attrs[] = {
233 &dev_attr_temp1_input.attr,
234 &dev_attr_in0_input.attr,
235 &sensor_dev_attr_in1_input.dev_attr.attr,
236 &sensor_dev_attr_in2_input.dev_attr.attr,
237 &sensor_dev_attr_in3_input.dev_attr.attr,
238 &sensor_dev_attr_in4_input.dev_attr.attr,
239 &sensor_dev_attr_in5_input.dev_attr.attr,
240 &sensor_dev_attr_in6_input.dev_attr.attr,
241 &sensor_dev_attr_in7_input.dev_attr.attr,
242 &sensor_dev_attr_in8_input.dev_attr.attr,
243 &sensor_dev_attr_no_average.dev_attr.attr,
244 &sensor_dev_attr_fast_sampling.dev_attr.attr,
245 &sensor_dev_attr_adc_ref_vdd.dev_attr.attr,
246 NULL
247};
248
249static const struct attribute_group adt7411_attr_grp = {
250 .attrs = adt7411_attrs,
251};
252
253static int adt7411_detect(struct i2c_client *client,
254 struct i2c_board_info *info)
255{
256 int val;
257
258 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
259 return -ENODEV;
260
261 val = i2c_smbus_read_byte_data(client, ADT7411_REG_MANUFACTURER_ID);
262 if (val < 0 || val != ADT7411_MANUFACTURER_ID) {
263 dev_dbg(&client->dev, "Wrong manufacturer ID. Got %d, "
264 "expected %d\n", val, ADT7411_MANUFACTURER_ID);
265 return -ENODEV;
266 }
267
268 val = i2c_smbus_read_byte_data(client, ADT7411_REG_DEVICE_ID);
269 if (val < 0 || val != ADT7411_DEVICE_ID) {
270 dev_dbg(&client->dev, "Wrong device ID. Got %d, "
271 "expected %d\n", val, ADT7411_DEVICE_ID);
272 return -ENODEV;
273 }
274
275 strlcpy(info->type, "adt7411", I2C_NAME_SIZE);
276
277 return 0;
278}
279
280static int __devinit adt7411_probe(struct i2c_client *client,
281 const struct i2c_device_id *id)
282{
283 struct adt7411_data *data;
284 int ret;
285
286 data = kzalloc(sizeof(*data), GFP_KERNEL);
287 if (!data)
288 return -ENOMEM;
289
290 i2c_set_clientdata(client, data);
291 mutex_init(&data->device_lock);
292 mutex_init(&data->update_lock);
293
294 ret = adt7411_modify_bit(client, ADT7411_REG_CFG1,
295 ADT7411_CFG1_START_MONITOR, 1);
296 if (ret < 0)
297 goto exit_free;
298
299 /* force update on first occasion */
300 data->next_update = jiffies;
301
302 ret = sysfs_create_group(&client->dev.kobj, &adt7411_attr_grp);
303 if (ret)
304 goto exit_free;
305
306 data->hwmon_dev = hwmon_device_register(&client->dev);
307 if (IS_ERR(data->hwmon_dev)) {
308 ret = PTR_ERR(data->hwmon_dev);
309 goto exit_remove;
310 }
311
312 dev_info(&client->dev, "successfully registered\n");
313
314 return 0;
315
316 exit_remove:
317 sysfs_remove_group(&client->dev.kobj, &adt7411_attr_grp);
318 exit_free:
319 kfree(data);
320 return ret;
321}
322
323static int __devexit adt7411_remove(struct i2c_client *client)
324{
325 struct adt7411_data *data = i2c_get_clientdata(client);
326
327 hwmon_device_unregister(data->hwmon_dev);
328 sysfs_remove_group(&client->dev.kobj, &adt7411_attr_grp);
329 kfree(data);
330 return 0;
331}
332
333static const struct i2c_device_id adt7411_id[] = {
334 { "adt7411", 0 },
335 { }
336};
337MODULE_DEVICE_TABLE(i2c, adt7411_id);
338
339static struct i2c_driver adt7411_driver = {
340 .driver = {
341 .name = "adt7411",
342 },
343 .probe = adt7411_probe,
344 .remove = __devexit_p(adt7411_remove),
345 .id_table = adt7411_id,
346 .detect = adt7411_detect,
347 .address_list = normal_i2c,
348 .class = I2C_CLASS_HWMON,
349};
350
351module_i2c_driver(adt7411_driver);
352
353MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de> and "
354 "Wolfram Sang <w.sang@pengutronix.de>");
355MODULE_DESCRIPTION("ADT7411 driver");
356MODULE_LICENSE("GPL v2");