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d84ca5b3 WS |
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 | |
e6a83dbe | 11 | * use power-down mode for suspend?, interrupt handling? |
d84ca5b3 WS |
12 | */ |
13 | ||
14 | #include <linux/kernel.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/init.h> | |
17 | #include <linux/err.h> | |
d84ca5b3 WS |
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> | |
5a0e3ad6 | 23 | #include <linux/slab.h> |
d84ca5b3 WS |
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) | |
b53893aa | 33 | #define ADT7411_CFG1_RESERVED_BIT3 (1 << 3) |
d84ca5b3 WS |
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 | ||
48 | static const unsigned short normal_i2c[] = { 0x48, 0x4a, 0x4b, I2C_CLIENT_END }; | |
49 | ||
50 | struct adt7411_data { | |
51 | struct mutex device_lock; /* for "atomic" device accesses */ | |
23244985 | 52 | struct mutex update_lock; |
d84ca5b3 WS |
53 | unsigned long next_update; |
54 | int vref_cached; | |
eac83cd9 | 55 | struct i2c_client *client; |
d84ca5b3 WS |
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 | */ | |
64 | static 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 | ||
88 | static 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 | ||
112 | static ssize_t adt7411_show_vdd(struct device *dev, | |
113 | struct device_attribute *attr, char *buf) | |
114 | { | |
eac83cd9 AL |
115 | struct adt7411_data *data = dev_get_drvdata(dev); |
116 | struct i2c_client *client = data->client; | |
d84ca5b3 WS |
117 | int ret = adt7411_read_10_bit(client, ADT7411_REG_INT_TEMP_VDD_LSB, |
118 | ADT7411_REG_VDD_MSB, 2); | |
119 | ||
120 | return ret < 0 ? ret : sprintf(buf, "%u\n", ret * 7000 / 1024); | |
121 | } | |
122 | ||
123 | static ssize_t adt7411_show_temp(struct device *dev, | |
124 | struct device_attribute *attr, char *buf) | |
125 | { | |
eac83cd9 AL |
126 | struct adt7411_data *data = dev_get_drvdata(dev); |
127 | struct i2c_client *client = data->client; | |
d84ca5b3 WS |
128 | int val = adt7411_read_10_bit(client, ADT7411_REG_INT_TEMP_VDD_LSB, |
129 | ADT7411_REG_INT_TEMP_MSB, 0); | |
130 | ||
131 | if (val < 0) | |
132 | return val; | |
133 | ||
134 | val = val & 0x200 ? val - 0x400 : val; /* 10 bit signed */ | |
135 | ||
136 | return sprintf(buf, "%d\n", val * 250); | |
137 | } | |
138 | ||
139 | static ssize_t adt7411_show_input(struct device *dev, | |
140 | struct device_attribute *attr, char *buf) | |
141 | { | |
142 | int nr = to_sensor_dev_attr(attr)->index; | |
eac83cd9 AL |
143 | struct adt7411_data *data = dev_get_drvdata(dev); |
144 | struct i2c_client *client = data->client; | |
d84ca5b3 WS |
145 | int val; |
146 | u8 lsb_reg, lsb_shift; | |
147 | ||
23244985 | 148 | mutex_lock(&data->update_lock); |
d84ca5b3 WS |
149 | if (time_after_eq(jiffies, data->next_update)) { |
150 | val = i2c_smbus_read_byte_data(client, ADT7411_REG_CFG3); | |
151 | if (val < 0) | |
23244985 | 152 | goto exit_unlock; |
d84ca5b3 | 153 | |
23244985 | 154 | if (val & ADT7411_CFG3_REF_VDD) { |
d84ca5b3 WS |
155 | val = adt7411_read_10_bit(client, |
156 | ADT7411_REG_INT_TEMP_VDD_LSB, | |
157 | ADT7411_REG_VDD_MSB, 2); | |
158 | if (val < 0) | |
23244985 | 159 | goto exit_unlock; |
d84ca5b3 WS |
160 | |
161 | data->vref_cached = val * 7000 / 1024; | |
162 | } else { | |
163 | data->vref_cached = 2250; | |
164 | } | |
165 | ||
166 | data->next_update = jiffies + HZ; | |
167 | } | |
168 | ||
169 | lsb_reg = ADT7411_REG_EXT_TEMP_AIN14_LSB + (nr >> 2); | |
170 | lsb_shift = 2 * (nr & 0x03); | |
171 | val = adt7411_read_10_bit(client, lsb_reg, | |
172 | ADT7411_REG_EXT_TEMP_AIN1_MSB + nr, lsb_shift); | |
23244985 WS |
173 | if (val < 0) |
174 | goto exit_unlock; | |
d84ca5b3 | 175 | |
23244985 WS |
176 | val = sprintf(buf, "%u\n", val * data->vref_cached / 1024); |
177 | exit_unlock: | |
178 | mutex_unlock(&data->update_lock); | |
179 | return val; | |
d84ca5b3 WS |
180 | } |
181 | ||
182 | static ssize_t adt7411_show_bit(struct device *dev, | |
183 | struct device_attribute *attr, char *buf) | |
184 | { | |
185 | struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(attr); | |
eac83cd9 AL |
186 | struct adt7411_data *data = dev_get_drvdata(dev); |
187 | struct i2c_client *client = data->client; | |
d84ca5b3 WS |
188 | int ret = i2c_smbus_read_byte_data(client, attr2->index); |
189 | ||
190 | return ret < 0 ? ret : sprintf(buf, "%u\n", !!(ret & attr2->nr)); | |
191 | } | |
192 | ||
193 | static ssize_t adt7411_set_bit(struct device *dev, | |
194 | struct device_attribute *attr, const char *buf, | |
195 | size_t count) | |
196 | { | |
197 | struct sensor_device_attribute_2 *s_attr2 = to_sensor_dev_attr_2(attr); | |
eac83cd9 AL |
198 | struct adt7411_data *data = dev_get_drvdata(dev); |
199 | struct i2c_client *client = data->client; | |
d84ca5b3 WS |
200 | int ret; |
201 | unsigned long flag; | |
202 | ||
179c4fdb | 203 | ret = kstrtoul(buf, 0, &flag); |
d84ca5b3 WS |
204 | if (ret || flag > 1) |
205 | return -EINVAL; | |
206 | ||
207 | ret = adt7411_modify_bit(client, s_attr2->index, s_attr2->nr, flag); | |
208 | ||
209 | /* force update */ | |
23244985 | 210 | mutex_lock(&data->update_lock); |
d84ca5b3 | 211 | data->next_update = jiffies; |
23244985 | 212 | mutex_unlock(&data->update_lock); |
d84ca5b3 WS |
213 | |
214 | return ret < 0 ? ret : count; | |
215 | } | |
216 | ||
217 | #define ADT7411_BIT_ATTR(__name, __reg, __bit) \ | |
218 | SENSOR_DEVICE_ATTR_2(__name, S_IRUGO | S_IWUSR, adt7411_show_bit, \ | |
219 | adt7411_set_bit, __bit, __reg) | |
220 | ||
221 | static DEVICE_ATTR(temp1_input, S_IRUGO, adt7411_show_temp, NULL); | |
222 | static DEVICE_ATTR(in0_input, S_IRUGO, adt7411_show_vdd, NULL); | |
223 | static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, adt7411_show_input, NULL, 0); | |
224 | static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, adt7411_show_input, NULL, 1); | |
225 | static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, adt7411_show_input, NULL, 2); | |
226 | static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, adt7411_show_input, NULL, 3); | |
227 | static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, adt7411_show_input, NULL, 4); | |
228 | static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, adt7411_show_input, NULL, 5); | |
229 | static SENSOR_DEVICE_ATTR(in7_input, S_IRUGO, adt7411_show_input, NULL, 6); | |
230 | static SENSOR_DEVICE_ATTR(in8_input, S_IRUGO, adt7411_show_input, NULL, 7); | |
231 | static ADT7411_BIT_ATTR(no_average, ADT7411_REG_CFG2, ADT7411_CFG2_DISABLE_AVG); | |
232 | static ADT7411_BIT_ATTR(fast_sampling, ADT7411_REG_CFG3, ADT7411_CFG3_ADC_CLK_225); | |
233 | static ADT7411_BIT_ATTR(adc_ref_vdd, ADT7411_REG_CFG3, ADT7411_CFG3_REF_VDD); | |
234 | ||
235 | static struct attribute *adt7411_attrs[] = { | |
236 | &dev_attr_temp1_input.attr, | |
237 | &dev_attr_in0_input.attr, | |
238 | &sensor_dev_attr_in1_input.dev_attr.attr, | |
239 | &sensor_dev_attr_in2_input.dev_attr.attr, | |
240 | &sensor_dev_attr_in3_input.dev_attr.attr, | |
241 | &sensor_dev_attr_in4_input.dev_attr.attr, | |
242 | &sensor_dev_attr_in5_input.dev_attr.attr, | |
243 | &sensor_dev_attr_in6_input.dev_attr.attr, | |
244 | &sensor_dev_attr_in7_input.dev_attr.attr, | |
245 | &sensor_dev_attr_in8_input.dev_attr.attr, | |
246 | &sensor_dev_attr_no_average.dev_attr.attr, | |
247 | &sensor_dev_attr_fast_sampling.dev_attr.attr, | |
248 | &sensor_dev_attr_adc_ref_vdd.dev_attr.attr, | |
249 | NULL | |
250 | }; | |
251 | ||
eac83cd9 | 252 | ATTRIBUTE_GROUPS(adt7411); |
d84ca5b3 WS |
253 | |
254 | static int adt7411_detect(struct i2c_client *client, | |
255 | struct i2c_board_info *info) | |
256 | { | |
257 | int val; | |
258 | ||
259 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) | |
260 | return -ENODEV; | |
261 | ||
262 | val = i2c_smbus_read_byte_data(client, ADT7411_REG_MANUFACTURER_ID); | |
263 | if (val < 0 || val != ADT7411_MANUFACTURER_ID) { | |
b55f3757 GR |
264 | dev_dbg(&client->dev, |
265 | "Wrong manufacturer ID. Got %d, expected %d\n", | |
266 | val, ADT7411_MANUFACTURER_ID); | |
d84ca5b3 WS |
267 | return -ENODEV; |
268 | } | |
269 | ||
270 | val = i2c_smbus_read_byte_data(client, ADT7411_REG_DEVICE_ID); | |
271 | if (val < 0 || val != ADT7411_DEVICE_ID) { | |
b55f3757 GR |
272 | dev_dbg(&client->dev, |
273 | "Wrong device ID. Got %d, expected %d\n", | |
274 | val, ADT7411_DEVICE_ID); | |
d84ca5b3 WS |
275 | return -ENODEV; |
276 | } | |
277 | ||
278 | strlcpy(info->type, "adt7411", I2C_NAME_SIZE); | |
279 | ||
280 | return 0; | |
281 | } | |
282 | ||
6c931ae1 | 283 | static int adt7411_probe(struct i2c_client *client, |
d84ca5b3 WS |
284 | const struct i2c_device_id *id) |
285 | { | |
eac83cd9 | 286 | struct device *dev = &client->dev; |
d84ca5b3 | 287 | struct adt7411_data *data; |
eac83cd9 | 288 | struct device *hwmon_dev; |
d84ca5b3 WS |
289 | int ret; |
290 | ||
eac83cd9 | 291 | data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); |
d84ca5b3 WS |
292 | if (!data) |
293 | return -ENOMEM; | |
294 | ||
295 | i2c_set_clientdata(client, data); | |
eac83cd9 | 296 | data->client = client; |
d84ca5b3 | 297 | mutex_init(&data->device_lock); |
23244985 | 298 | mutex_init(&data->update_lock); |
d84ca5b3 | 299 | |
b53893aa | 300 | /* According to the datasheet, we must only write 1 to bit 3 */ |
d84ca5b3 | 301 | ret = adt7411_modify_bit(client, ADT7411_REG_CFG1, |
b53893aa MW |
302 | ADT7411_CFG1_RESERVED_BIT3 |
303 | | ADT7411_CFG1_START_MONITOR, 1); | |
d84ca5b3 | 304 | if (ret < 0) |
65ec17b0 | 305 | return ret; |
d84ca5b3 WS |
306 | |
307 | /* force update on first occasion */ | |
308 | data->next_update = jiffies; | |
309 | ||
eac83cd9 AL |
310 | hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, |
311 | data, | |
312 | adt7411_groups); | |
313 | return PTR_ERR_OR_ZERO(hwmon_dev); | |
d84ca5b3 WS |
314 | } |
315 | ||
316 | static const struct i2c_device_id adt7411_id[] = { | |
317 | { "adt7411", 0 }, | |
318 | { } | |
319 | }; | |
a7254d68 | 320 | MODULE_DEVICE_TABLE(i2c, adt7411_id); |
d84ca5b3 WS |
321 | |
322 | static struct i2c_driver adt7411_driver = { | |
323 | .driver = { | |
324 | .name = "adt7411", | |
325 | }, | |
326 | .probe = adt7411_probe, | |
d84ca5b3 WS |
327 | .id_table = adt7411_id, |
328 | .detect = adt7411_detect, | |
329 | .address_list = normal_i2c, | |
330 | .class = I2C_CLASS_HWMON, | |
331 | }; | |
332 | ||
f0967eea | 333 | module_i2c_driver(adt7411_driver); |
d84ca5b3 WS |
334 | |
335 | MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de> and " | |
336 | "Wolfram Sang <w.sang@pengutronix.de>"); | |
337 | MODULE_DESCRIPTION("ADT7411 driver"); | |
338 | MODULE_LICENSE("GPL v2"); |