2 * Driver for the ADT7411 (I2C/SPI 8 channel 10 bit ADC & temperature-sensor)
4 * Copyright (C) 2008, 2010 Pengutronix
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.
10 * TODO: SPI, support for external temperature sensor
11 * use power-down mode for suspend?, interrupt handling?
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>
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
32 #define ADT7411_REG_CFG1 0x18
33 #define ADT7411_CFG1_START_MONITOR (1 << 0)
34 #define ADT7411_CFG1_RESERVED_BIT3 (1 << 3)
36 #define ADT7411_REG_CFG2 0x19
37 #define ADT7411_CFG2_DISABLE_AVG (1 << 5)
39 #define ADT7411_REG_CFG3 0x1a
40 #define ADT7411_CFG3_ADC_CLK_225 (1 << 0)
41 #define ADT7411_CFG3_REF_VDD (1 << 4)
43 #define ADT7411_REG_DEVICE_ID 0x4d
44 #define ADT7411_REG_MANUFACTURER_ID 0x4e
46 #define ADT7411_DEVICE_ID 0x2
47 #define ADT7411_MANUFACTURER_ID 0x41
49 static const unsigned short normal_i2c[] = { 0x48, 0x4a, 0x4b, I2C_CLIENT_END };
52 struct mutex device_lock; /* for "atomic" device accesses */
53 struct mutex update_lock;
54 unsigned long next_update;
56 struct device *hwmon_dev;
60 * When reading a register containing (up to 4) lsb, all associated
61 * msb-registers get locked by the hardware. After _one_ of those msb is read,
62 * _all_ are unlocked. In order to use this locking correctly, reading lsb/msb
63 * is protected here with a mutex, too.
65 static int adt7411_read_10_bit(struct i2c_client *client, u8 lsb_reg,
66 u8 msb_reg, u8 lsb_shift)
68 struct adt7411_data *data = i2c_get_clientdata(client);
71 mutex_lock(&data->device_lock);
73 val = i2c_smbus_read_byte_data(client, lsb_reg);
77 tmp = (val >> lsb_shift) & 3;
78 val = i2c_smbus_read_byte_data(client, msb_reg);
81 val = (val << 2) | tmp;
84 mutex_unlock(&data->device_lock);
89 static int adt7411_modify_bit(struct i2c_client *client, u8 reg, u8 bit,
92 struct adt7411_data *data = i2c_get_clientdata(client);
95 mutex_lock(&data->device_lock);
97 ret = i2c_smbus_read_byte_data(client, reg);
106 ret = i2c_smbus_write_byte_data(client, reg, val);
109 mutex_unlock(&data->device_lock);
113 static ssize_t adt7411_show_vdd(struct device *dev,
114 struct device_attribute *attr, char *buf)
116 struct i2c_client *client = to_i2c_client(dev);
117 int ret = adt7411_read_10_bit(client, ADT7411_REG_INT_TEMP_VDD_LSB,
118 ADT7411_REG_VDD_MSB, 2);
120 return ret < 0 ? ret : sprintf(buf, "%u\n", ret * 7000 / 1024);
123 static ssize_t adt7411_show_temp(struct device *dev,
124 struct device_attribute *attr, char *buf)
126 struct i2c_client *client = to_i2c_client(dev);
127 int val = adt7411_read_10_bit(client, ADT7411_REG_INT_TEMP_VDD_LSB,
128 ADT7411_REG_INT_TEMP_MSB, 0);
133 val = val & 0x200 ? val - 0x400 : val; /* 10 bit signed */
135 return sprintf(buf, "%d\n", val * 250);
138 static ssize_t adt7411_show_input(struct device *dev,
139 struct device_attribute *attr, char *buf)
141 int nr = to_sensor_dev_attr(attr)->index;
142 struct i2c_client *client = to_i2c_client(dev);
143 struct adt7411_data *data = i2c_get_clientdata(client);
145 u8 lsb_reg, lsb_shift;
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);
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);
160 data->vref_cached = val * 7000 / 1024;
162 data->vref_cached = 2250;
165 data->next_update = jiffies + HZ;
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);
175 val = sprintf(buf, "%u\n", val * data->vref_cached / 1024);
177 mutex_unlock(&data->update_lock);
181 static ssize_t adt7411_show_bit(struct device *dev,
182 struct device_attribute *attr, char *buf)
184 struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(attr);
185 struct i2c_client *client = to_i2c_client(dev);
186 int ret = i2c_smbus_read_byte_data(client, attr2->index);
188 return ret < 0 ? ret : sprintf(buf, "%u\n", !!(ret & attr2->nr));
191 static ssize_t adt7411_set_bit(struct device *dev,
192 struct device_attribute *attr, const char *buf,
195 struct sensor_device_attribute_2 *s_attr2 = to_sensor_dev_attr_2(attr);
196 struct i2c_client *client = to_i2c_client(dev);
197 struct adt7411_data *data = i2c_get_clientdata(client);
201 ret = strict_strtoul(buf, 0, &flag);
205 ret = adt7411_modify_bit(client, s_attr2->index, s_attr2->nr, flag);
208 mutex_lock(&data->update_lock);
209 data->next_update = jiffies;
210 mutex_unlock(&data->update_lock);
212 return ret < 0 ? ret : count;
215 #define ADT7411_BIT_ATTR(__name, __reg, __bit) \
216 SENSOR_DEVICE_ATTR_2(__name, S_IRUGO | S_IWUSR, adt7411_show_bit, \
217 adt7411_set_bit, __bit, __reg)
219 static DEVICE_ATTR(temp1_input, S_IRUGO, adt7411_show_temp, NULL);
220 static DEVICE_ATTR(in0_input, S_IRUGO, adt7411_show_vdd, NULL);
221 static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, adt7411_show_input, NULL, 0);
222 static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, adt7411_show_input, NULL, 1);
223 static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, adt7411_show_input, NULL, 2);
224 static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, adt7411_show_input, NULL, 3);
225 static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, adt7411_show_input, NULL, 4);
226 static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, adt7411_show_input, NULL, 5);
227 static SENSOR_DEVICE_ATTR(in7_input, S_IRUGO, adt7411_show_input, NULL, 6);
228 static SENSOR_DEVICE_ATTR(in8_input, S_IRUGO, adt7411_show_input, NULL, 7);
229 static ADT7411_BIT_ATTR(no_average, ADT7411_REG_CFG2, ADT7411_CFG2_DISABLE_AVG);
230 static ADT7411_BIT_ATTR(fast_sampling, ADT7411_REG_CFG3, ADT7411_CFG3_ADC_CLK_225);
231 static ADT7411_BIT_ATTR(adc_ref_vdd, ADT7411_REG_CFG3, ADT7411_CFG3_REF_VDD);
233 static struct attribute *adt7411_attrs[] = {
234 &dev_attr_temp1_input.attr,
235 &dev_attr_in0_input.attr,
236 &sensor_dev_attr_in1_input.dev_attr.attr,
237 &sensor_dev_attr_in2_input.dev_attr.attr,
238 &sensor_dev_attr_in3_input.dev_attr.attr,
239 &sensor_dev_attr_in4_input.dev_attr.attr,
240 &sensor_dev_attr_in5_input.dev_attr.attr,
241 &sensor_dev_attr_in6_input.dev_attr.attr,
242 &sensor_dev_attr_in7_input.dev_attr.attr,
243 &sensor_dev_attr_in8_input.dev_attr.attr,
244 &sensor_dev_attr_no_average.dev_attr.attr,
245 &sensor_dev_attr_fast_sampling.dev_attr.attr,
246 &sensor_dev_attr_adc_ref_vdd.dev_attr.attr,
250 static const struct attribute_group adt7411_attr_grp = {
251 .attrs = adt7411_attrs,
254 static int adt7411_detect(struct i2c_client *client,
255 struct i2c_board_info *info)
259 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
262 val = i2c_smbus_read_byte_data(client, ADT7411_REG_MANUFACTURER_ID);
263 if (val < 0 || val != ADT7411_MANUFACTURER_ID) {
264 dev_dbg(&client->dev, "Wrong manufacturer ID. Got %d, "
265 "expected %d\n", val, ADT7411_MANUFACTURER_ID);
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, "Wrong device ID. Got %d, "
272 "expected %d\n", val, ADT7411_DEVICE_ID);
276 strlcpy(info->type, "adt7411", I2C_NAME_SIZE);
281 static int __devinit adt7411_probe(struct i2c_client *client,
282 const struct i2c_device_id *id)
284 struct adt7411_data *data;
287 data = kzalloc(sizeof(*data), GFP_KERNEL);
291 i2c_set_clientdata(client, data);
292 mutex_init(&data->device_lock);
293 mutex_init(&data->update_lock);
295 /* According to the datasheet, we must only write 1 to bit 3 */
296 ret = adt7411_modify_bit(client, ADT7411_REG_CFG1,
297 ADT7411_CFG1_RESERVED_BIT3
298 | ADT7411_CFG1_START_MONITOR, 1);
302 /* force update on first occasion */
303 data->next_update = jiffies;
305 ret = sysfs_create_group(&client->dev.kobj, &adt7411_attr_grp);
309 data->hwmon_dev = hwmon_device_register(&client->dev);
310 if (IS_ERR(data->hwmon_dev)) {
311 ret = PTR_ERR(data->hwmon_dev);
315 dev_info(&client->dev, "successfully registered\n");
320 sysfs_remove_group(&client->dev.kobj, &adt7411_attr_grp);
326 static int __devexit adt7411_remove(struct i2c_client *client)
328 struct adt7411_data *data = i2c_get_clientdata(client);
330 hwmon_device_unregister(data->hwmon_dev);
331 sysfs_remove_group(&client->dev.kobj, &adt7411_attr_grp);
336 static const struct i2c_device_id adt7411_id[] = {
340 MODULE_DEVICE_TABLE(i2c, adt7411_id);
342 static struct i2c_driver adt7411_driver = {
346 .probe = adt7411_probe,
347 .remove = __devexit_p(adt7411_remove),
348 .id_table = adt7411_id,
349 .detect = adt7411_detect,
350 .address_list = normal_i2c,
351 .class = I2C_CLASS_HWMON,
354 static int __init sensors_adt7411_init(void)
356 return i2c_add_driver(&adt7411_driver);
358 module_init(sensors_adt7411_init)
360 static void __exit sensors_adt7411_exit(void)
362 i2c_del_driver(&adt7411_driver);
364 module_exit(sensors_adt7411_exit)
366 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de> and "
367 "Wolfram Sang <w.sang@pengutronix.de>");
368 MODULE_DESCRIPTION("ADT7411 driver");
369 MODULE_LICENSE("GPL v2");