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Wolfram Sangd84ca5b2010-03-05 22:17:23 +01001/*
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
Frans Meulenbroekse6a83db2012-01-08 19:34:12 +010011 * use power-down mode for suspend?, interrupt handling?
Wolfram Sangd84ca5b2010-03-05 22:17:23 +010012 */
13
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/init.h>
17#include <linux/err.h>
Wolfram Sangd84ca5b2010-03-05 22:17:23 +010018#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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090023#include <linux/slab.h>
Wolfram Sangd84ca5b2010-03-05 22:17:23 +010024
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 */
Wolfram Sang23244982010-03-05 22:17:23 +010051 struct mutex update_lock;
Wolfram Sangd84ca5b2010-03-05 22:17:23 +010052 unsigned long next_update;
53 int vref_cached;
Wolfram Sangd84ca5b2010-03-05 22:17:23 +010054 struct device *hwmon_dev;
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 i2c_client *client = to_i2c_client(dev);
115 int ret = adt7411_read_10_bit(client, ADT7411_REG_INT_TEMP_VDD_LSB,
116 ADT7411_REG_VDD_MSB, 2);
117
118 return ret < 0 ? ret : sprintf(buf, "%u\n", ret * 7000 / 1024);
119}
120
121static ssize_t adt7411_show_temp(struct device *dev,
122 struct device_attribute *attr, char *buf)
123{
124 struct i2c_client *client = to_i2c_client(dev);
125 int val = adt7411_read_10_bit(client, ADT7411_REG_INT_TEMP_VDD_LSB,
126 ADT7411_REG_INT_TEMP_MSB, 0);
127
128 if (val < 0)
129 return val;
130
131 val = val & 0x200 ? val - 0x400 : val; /* 10 bit signed */
132
133 return sprintf(buf, "%d\n", val * 250);
134}
135
136static ssize_t adt7411_show_input(struct device *dev,
137 struct device_attribute *attr, char *buf)
138{
139 int nr = to_sensor_dev_attr(attr)->index;
140 struct i2c_client *client = to_i2c_client(dev);
141 struct adt7411_data *data = i2c_get_clientdata(client);
142 int val;
143 u8 lsb_reg, lsb_shift;
144
Wolfram Sang23244982010-03-05 22:17:23 +0100145 mutex_lock(&data->update_lock);
Wolfram Sangd84ca5b2010-03-05 22:17:23 +0100146 if (time_after_eq(jiffies, data->next_update)) {
147 val = i2c_smbus_read_byte_data(client, ADT7411_REG_CFG3);
148 if (val < 0)
Wolfram Sang23244982010-03-05 22:17:23 +0100149 goto exit_unlock;
Wolfram Sangd84ca5b2010-03-05 22:17:23 +0100150
Wolfram Sang23244982010-03-05 22:17:23 +0100151 if (val & ADT7411_CFG3_REF_VDD) {
Wolfram Sangd84ca5b2010-03-05 22:17:23 +0100152 val = adt7411_read_10_bit(client,
153 ADT7411_REG_INT_TEMP_VDD_LSB,
154 ADT7411_REG_VDD_MSB, 2);
155 if (val < 0)
Wolfram Sang23244982010-03-05 22:17:23 +0100156 goto exit_unlock;
Wolfram Sangd84ca5b2010-03-05 22:17:23 +0100157
158 data->vref_cached = val * 7000 / 1024;
159 } else {
160 data->vref_cached = 2250;
161 }
162
163 data->next_update = jiffies + HZ;
164 }
165
166 lsb_reg = ADT7411_REG_EXT_TEMP_AIN14_LSB + (nr >> 2);
167 lsb_shift = 2 * (nr & 0x03);
168 val = adt7411_read_10_bit(client, lsb_reg,
169 ADT7411_REG_EXT_TEMP_AIN1_MSB + nr, lsb_shift);
Wolfram Sang23244982010-03-05 22:17:23 +0100170 if (val < 0)
171 goto exit_unlock;
Wolfram Sangd84ca5b2010-03-05 22:17:23 +0100172
Wolfram Sang23244982010-03-05 22:17:23 +0100173 val = sprintf(buf, "%u\n", val * data->vref_cached / 1024);
174 exit_unlock:
175 mutex_unlock(&data->update_lock);
176 return val;
Wolfram Sangd84ca5b2010-03-05 22:17:23 +0100177}
178
179static ssize_t adt7411_show_bit(struct device *dev,
180 struct device_attribute *attr, char *buf)
181{
182 struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(attr);
183 struct i2c_client *client = to_i2c_client(dev);
184 int ret = i2c_smbus_read_byte_data(client, attr2->index);
185
186 return ret < 0 ? ret : sprintf(buf, "%u\n", !!(ret & attr2->nr));
187}
188
189static ssize_t adt7411_set_bit(struct device *dev,
190 struct device_attribute *attr, const char *buf,
191 size_t count)
192{
193 struct sensor_device_attribute_2 *s_attr2 = to_sensor_dev_attr_2(attr);
194 struct i2c_client *client = to_i2c_client(dev);
195 struct adt7411_data *data = i2c_get_clientdata(client);
196 int ret;
197 unsigned long flag;
198
Frans Meulenbroeks179c4fd2012-01-04 20:58:52 +0100199 ret = kstrtoul(buf, 0, &flag);
Wolfram Sangd84ca5b2010-03-05 22:17:23 +0100200 if (ret || flag > 1)
201 return -EINVAL;
202
203 ret = adt7411_modify_bit(client, s_attr2->index, s_attr2->nr, flag);
204
205 /* force update */
Wolfram Sang23244982010-03-05 22:17:23 +0100206 mutex_lock(&data->update_lock);
Wolfram Sangd84ca5b2010-03-05 22:17:23 +0100207 data->next_update = jiffies;
Wolfram Sang23244982010-03-05 22:17:23 +0100208 mutex_unlock(&data->update_lock);
Wolfram Sangd84ca5b2010-03-05 22:17:23 +0100209
210 return ret < 0 ? ret : count;
211}
212
213#define ADT7411_BIT_ATTR(__name, __reg, __bit) \
214 SENSOR_DEVICE_ATTR_2(__name, S_IRUGO | S_IWUSR, adt7411_show_bit, \
215 adt7411_set_bit, __bit, __reg)
216
217static DEVICE_ATTR(temp1_input, S_IRUGO, adt7411_show_temp, NULL);
218static DEVICE_ATTR(in0_input, S_IRUGO, adt7411_show_vdd, NULL);
219static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, adt7411_show_input, NULL, 0);
220static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, adt7411_show_input, NULL, 1);
221static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, adt7411_show_input, NULL, 2);
222static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, adt7411_show_input, NULL, 3);
223static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, adt7411_show_input, NULL, 4);
224static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, adt7411_show_input, NULL, 5);
225static SENSOR_DEVICE_ATTR(in7_input, S_IRUGO, adt7411_show_input, NULL, 6);
226static SENSOR_DEVICE_ATTR(in8_input, S_IRUGO, adt7411_show_input, NULL, 7);
227static ADT7411_BIT_ATTR(no_average, ADT7411_REG_CFG2, ADT7411_CFG2_DISABLE_AVG);
228static ADT7411_BIT_ATTR(fast_sampling, ADT7411_REG_CFG3, ADT7411_CFG3_ADC_CLK_225);
229static ADT7411_BIT_ATTR(adc_ref_vdd, ADT7411_REG_CFG3, ADT7411_CFG3_REF_VDD);
230
231static struct attribute *adt7411_attrs[] = {
232 &dev_attr_temp1_input.attr,
233 &dev_attr_in0_input.attr,
234 &sensor_dev_attr_in1_input.dev_attr.attr,
235 &sensor_dev_attr_in2_input.dev_attr.attr,
236 &sensor_dev_attr_in3_input.dev_attr.attr,
237 &sensor_dev_attr_in4_input.dev_attr.attr,
238 &sensor_dev_attr_in5_input.dev_attr.attr,
239 &sensor_dev_attr_in6_input.dev_attr.attr,
240 &sensor_dev_attr_in7_input.dev_attr.attr,
241 &sensor_dev_attr_in8_input.dev_attr.attr,
242 &sensor_dev_attr_no_average.dev_attr.attr,
243 &sensor_dev_attr_fast_sampling.dev_attr.attr,
244 &sensor_dev_attr_adc_ref_vdd.dev_attr.attr,
245 NULL
246};
247
248static const struct attribute_group adt7411_attr_grp = {
249 .attrs = adt7411_attrs,
250};
251
252static int adt7411_detect(struct i2c_client *client,
253 struct i2c_board_info *info)
254{
255 int val;
256
257 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
258 return -ENODEV;
259
260 val = i2c_smbus_read_byte_data(client, ADT7411_REG_MANUFACTURER_ID);
261 if (val < 0 || val != ADT7411_MANUFACTURER_ID) {
262 dev_dbg(&client->dev, "Wrong manufacturer ID. Got %d, "
263 "expected %d\n", val, ADT7411_MANUFACTURER_ID);
264 return -ENODEV;
265 }
266
267 val = i2c_smbus_read_byte_data(client, ADT7411_REG_DEVICE_ID);
268 if (val < 0 || val != ADT7411_DEVICE_ID) {
269 dev_dbg(&client->dev, "Wrong device ID. Got %d, "
270 "expected %d\n", val, ADT7411_DEVICE_ID);
271 return -ENODEV;
272 }
273
274 strlcpy(info->type, "adt7411", I2C_NAME_SIZE);
275
276 return 0;
277}
278
Bill Pemberton6c931ae2012-11-19 13:22:35 -0500279static int adt7411_probe(struct i2c_client *client,
Wolfram Sangd84ca5b2010-03-05 22:17:23 +0100280 const struct i2c_device_id *id)
281{
282 struct adt7411_data *data;
283 int ret;
284
Guenter Roeck65ec17b2012-06-02 09:58:01 -0700285 data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
Wolfram Sangd84ca5b2010-03-05 22:17:23 +0100286 if (!data)
287 return -ENOMEM;
288
289 i2c_set_clientdata(client, data);
290 mutex_init(&data->device_lock);
Wolfram Sang23244982010-03-05 22:17:23 +0100291 mutex_init(&data->update_lock);
Wolfram Sangd84ca5b2010-03-05 22:17:23 +0100292
293 ret = adt7411_modify_bit(client, ADT7411_REG_CFG1,
294 ADT7411_CFG1_START_MONITOR, 1);
295 if (ret < 0)
Guenter Roeck65ec17b2012-06-02 09:58:01 -0700296 return ret;
Wolfram Sangd84ca5b2010-03-05 22:17:23 +0100297
298 /* force update on first occasion */
299 data->next_update = jiffies;
300
301 ret = sysfs_create_group(&client->dev.kobj, &adt7411_attr_grp);
302 if (ret)
Guenter Roeck65ec17b2012-06-02 09:58:01 -0700303 return ret;
Wolfram Sangd84ca5b2010-03-05 22:17:23 +0100304
305 data->hwmon_dev = hwmon_device_register(&client->dev);
306 if (IS_ERR(data->hwmon_dev)) {
307 ret = PTR_ERR(data->hwmon_dev);
308 goto exit_remove;
309 }
310
311 dev_info(&client->dev, "successfully registered\n");
312
313 return 0;
314
315 exit_remove:
316 sysfs_remove_group(&client->dev.kobj, &adt7411_attr_grp);
Wolfram Sangd84ca5b2010-03-05 22:17:23 +0100317 return ret;
318}
319
Bill Pemberton281dfd02012-11-19 13:25:51 -0500320static int adt7411_remove(struct i2c_client *client)
Wolfram Sangd84ca5b2010-03-05 22:17:23 +0100321{
322 struct adt7411_data *data = i2c_get_clientdata(client);
323
324 hwmon_device_unregister(data->hwmon_dev);
325 sysfs_remove_group(&client->dev.kobj, &adt7411_attr_grp);
Wolfram Sangd84ca5b2010-03-05 22:17:23 +0100326 return 0;
327}
328
329static const struct i2c_device_id adt7411_id[] = {
330 { "adt7411", 0 },
331 { }
332};
axel lina7254d62011-02-24 02:22:01 +0000333MODULE_DEVICE_TABLE(i2c, adt7411_id);
Wolfram Sangd84ca5b2010-03-05 22:17:23 +0100334
335static struct i2c_driver adt7411_driver = {
336 .driver = {
337 .name = "adt7411",
338 },
339 .probe = adt7411_probe,
Bill Pemberton9e5e9b72012-11-19 13:21:20 -0500340 .remove = adt7411_remove,
Wolfram Sangd84ca5b2010-03-05 22:17:23 +0100341 .id_table = adt7411_id,
342 .detect = adt7411_detect,
343 .address_list = normal_i2c,
344 .class = I2C_CLASS_HWMON,
345};
346
Axel Linf0967ee2012-01-20 15:38:18 +0800347module_i2c_driver(adt7411_driver);
Wolfram Sangd84ca5b2010-03-05 22:17:23 +0100348
349MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de> and "
350 "Wolfram Sang <w.sang@pengutronix.de>");
351MODULE_DESCRIPTION("ADT7411 driver");
352MODULE_LICENSE("GPL v2");