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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;
Axel Lineac83cd2014-07-19 22:42:33 +080054 struct i2c_client *client;
Wolfram Sangd84ca5b2010-03-05 22:17:23 +010055};
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{
Axel Lineac83cd2014-07-19 22:42:33 +0800114 struct adt7411_data *data = dev_get_drvdata(dev);
115 struct i2c_client *client = data->client;
Wolfram Sangd84ca5b2010-03-05 22:17:23 +0100116 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{
Axel Lineac83cd2014-07-19 22:42:33 +0800125 struct adt7411_data *data = dev_get_drvdata(dev);
126 struct i2c_client *client = data->client;
Wolfram Sangd84ca5b2010-03-05 22:17:23 +0100127 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;
Axel Lineac83cd2014-07-19 22:42:33 +0800142 struct adt7411_data *data = dev_get_drvdata(dev);
143 struct i2c_client *client = data->client;
Wolfram Sangd84ca5b2010-03-05 22:17:23 +0100144 int val;
145 u8 lsb_reg, lsb_shift;
146
Wolfram Sang23244982010-03-05 22:17:23 +0100147 mutex_lock(&data->update_lock);
Wolfram Sangd84ca5b2010-03-05 22:17:23 +0100148 if (time_after_eq(jiffies, data->next_update)) {
149 val = i2c_smbus_read_byte_data(client, ADT7411_REG_CFG3);
150 if (val < 0)
Wolfram Sang23244982010-03-05 22:17:23 +0100151 goto exit_unlock;
Wolfram Sangd84ca5b2010-03-05 22:17:23 +0100152
Wolfram Sang23244982010-03-05 22:17:23 +0100153 if (val & ADT7411_CFG3_REF_VDD) {
Wolfram Sangd84ca5b2010-03-05 22:17:23 +0100154 val = adt7411_read_10_bit(client,
155 ADT7411_REG_INT_TEMP_VDD_LSB,
156 ADT7411_REG_VDD_MSB, 2);
157 if (val < 0)
Wolfram Sang23244982010-03-05 22:17:23 +0100158 goto exit_unlock;
Wolfram Sangd84ca5b2010-03-05 22:17:23 +0100159
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);
Wolfram Sang23244982010-03-05 22:17:23 +0100172 if (val < 0)
173 goto exit_unlock;
Wolfram Sangd84ca5b2010-03-05 22:17:23 +0100174
Wolfram Sang23244982010-03-05 22:17:23 +0100175 val = sprintf(buf, "%u\n", val * data->vref_cached / 1024);
176 exit_unlock:
177 mutex_unlock(&data->update_lock);
178 return val;
Wolfram Sangd84ca5b2010-03-05 22:17:23 +0100179}
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);
Axel Lineac83cd2014-07-19 22:42:33 +0800185 struct adt7411_data *data = dev_get_drvdata(dev);
186 struct i2c_client *client = data->client;
Wolfram Sangd84ca5b2010-03-05 22:17:23 +0100187 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);
Axel Lineac83cd2014-07-19 22:42:33 +0800197 struct adt7411_data *data = dev_get_drvdata(dev);
198 struct i2c_client *client = data->client;
Wolfram Sangd84ca5b2010-03-05 22:17:23 +0100199 int ret;
200 unsigned long flag;
201
Frans Meulenbroeks179c4fd2012-01-04 20:58:52 +0100202 ret = kstrtoul(buf, 0, &flag);
Wolfram Sangd84ca5b2010-03-05 22:17:23 +0100203 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 */
Wolfram Sang23244982010-03-05 22:17:23 +0100209 mutex_lock(&data->update_lock);
Wolfram Sangd84ca5b2010-03-05 22:17:23 +0100210 data->next_update = jiffies;
Wolfram Sang23244982010-03-05 22:17:23 +0100211 mutex_unlock(&data->update_lock);
Wolfram Sangd84ca5b2010-03-05 22:17:23 +0100212
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
Axel Lineac83cd2014-07-19 22:42:33 +0800251ATTRIBUTE_GROUPS(adt7411);
Wolfram Sangd84ca5b2010-03-05 22:17:23 +0100252
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) {
Guenter Roeckb55f3752013-01-10 10:01:24 -0800263 dev_dbg(&client->dev,
264 "Wrong manufacturer ID. Got %d, expected %d\n",
265 val, ADT7411_MANUFACTURER_ID);
Wolfram Sangd84ca5b2010-03-05 22:17:23 +0100266 return -ENODEV;
267 }
268
269 val = i2c_smbus_read_byte_data(client, ADT7411_REG_DEVICE_ID);
270 if (val < 0 || val != ADT7411_DEVICE_ID) {
Guenter Roeckb55f3752013-01-10 10:01:24 -0800271 dev_dbg(&client->dev,
272 "Wrong device ID. Got %d, expected %d\n",
273 val, ADT7411_DEVICE_ID);
Wolfram Sangd84ca5b2010-03-05 22:17:23 +0100274 return -ENODEV;
275 }
276
277 strlcpy(info->type, "adt7411", I2C_NAME_SIZE);
278
279 return 0;
280}
281
Bill Pemberton6c931ae2012-11-19 13:22:35 -0500282static int adt7411_probe(struct i2c_client *client,
Wolfram Sangd84ca5b2010-03-05 22:17:23 +0100283 const struct i2c_device_id *id)
284{
Axel Lineac83cd2014-07-19 22:42:33 +0800285 struct device *dev = &client->dev;
Wolfram Sangd84ca5b2010-03-05 22:17:23 +0100286 struct adt7411_data *data;
Axel Lineac83cd2014-07-19 22:42:33 +0800287 struct device *hwmon_dev;
Wolfram Sangd84ca5b2010-03-05 22:17:23 +0100288 int ret;
289
Axel Lineac83cd2014-07-19 22:42:33 +0800290 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
Wolfram Sangd84ca5b2010-03-05 22:17:23 +0100291 if (!data)
292 return -ENOMEM;
293
294 i2c_set_clientdata(client, data);
Axel Lineac83cd2014-07-19 22:42:33 +0800295 data->client = client;
Wolfram Sangd84ca5b2010-03-05 22:17:23 +0100296 mutex_init(&data->device_lock);
Wolfram Sang23244982010-03-05 22:17:23 +0100297 mutex_init(&data->update_lock);
Wolfram Sangd84ca5b2010-03-05 22:17:23 +0100298
299 ret = adt7411_modify_bit(client, ADT7411_REG_CFG1,
300 ADT7411_CFG1_START_MONITOR, 1);
301 if (ret < 0)
Guenter Roeck65ec17b2012-06-02 09:58:01 -0700302 return ret;
Wolfram Sangd84ca5b2010-03-05 22:17:23 +0100303
304 /* force update on first occasion */
305 data->next_update = jiffies;
306
Axel Lineac83cd2014-07-19 22:42:33 +0800307 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
308 data,
309 adt7411_groups);
310 return PTR_ERR_OR_ZERO(hwmon_dev);
Wolfram Sangd84ca5b2010-03-05 22:17:23 +0100311}
312
313static const struct i2c_device_id adt7411_id[] = {
314 { "adt7411", 0 },
315 { }
316};
axel lina7254d62011-02-24 02:22:01 +0000317MODULE_DEVICE_TABLE(i2c, adt7411_id);
Wolfram Sangd84ca5b2010-03-05 22:17:23 +0100318
319static struct i2c_driver adt7411_driver = {
320 .driver = {
321 .name = "adt7411",
322 },
323 .probe = adt7411_probe,
Wolfram Sangd84ca5b2010-03-05 22:17:23 +0100324 .id_table = adt7411_id,
325 .detect = adt7411_detect,
326 .address_list = normal_i2c,
327 .class = I2C_CLASS_HWMON,
328};
329
Axel Linf0967ee2012-01-20 15:38:18 +0800330module_i2c_driver(adt7411_driver);
Wolfram Sangd84ca5b2010-03-05 22:17:23 +0100331
332MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de> and "
333 "Wolfram Sang <w.sang@pengutronix.de>");
334MODULE_DESCRIPTION("ADT7411 driver");
335MODULE_LICENSE("GPL v2");