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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) | |
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 | ||
47 | static const unsigned short normal_i2c[] = { 0x48, 0x4a, 0x4b, I2C_CLIENT_END }; | |
48 | ||
49 | struct adt7411_data { | |
50 | struct mutex device_lock; /* for "atomic" device accesses */ | |
23244985 | 51 | struct mutex update_lock; |
d84ca5b3 WS |
52 | unsigned long next_update; |
53 | int vref_cached; | |
eac83cd9 | 54 | struct i2c_client *client; |
d84ca5b3 WS |
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 | */ | |
63 | static 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 | ||
87 | static 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 | ||
111 | static ssize_t adt7411_show_vdd(struct device *dev, | |
112 | struct device_attribute *attr, char *buf) | |
113 | { | |
eac83cd9 AL |
114 | struct adt7411_data *data = dev_get_drvdata(dev); |
115 | struct i2c_client *client = data->client; | |
d84ca5b3 WS |
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 | ||
122 | static ssize_t adt7411_show_temp(struct device *dev, | |
123 | struct device_attribute *attr, char *buf) | |
124 | { | |
eac83cd9 AL |
125 | struct adt7411_data *data = dev_get_drvdata(dev); |
126 | struct i2c_client *client = data->client; | |
d84ca5b3 WS |
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 | ||
138 | static 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; | |
eac83cd9 AL |
142 | struct adt7411_data *data = dev_get_drvdata(dev); |
143 | struct i2c_client *client = data->client; | |
d84ca5b3 WS |
144 | int val; |
145 | u8 lsb_reg, lsb_shift; | |
146 | ||
23244985 | 147 | mutex_lock(&data->update_lock); |
d84ca5b3 WS |
148 | if (time_after_eq(jiffies, data->next_update)) { |
149 | val = i2c_smbus_read_byte_data(client, ADT7411_REG_CFG3); | |
150 | if (val < 0) | |
23244985 | 151 | goto exit_unlock; |
d84ca5b3 | 152 | |
23244985 | 153 | if (val & ADT7411_CFG3_REF_VDD) { |
d84ca5b3 WS |
154 | val = adt7411_read_10_bit(client, |
155 | ADT7411_REG_INT_TEMP_VDD_LSB, | |
156 | ADT7411_REG_VDD_MSB, 2); | |
157 | if (val < 0) | |
23244985 | 158 | goto exit_unlock; |
d84ca5b3 WS |
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); | |
23244985 WS |
172 | if (val < 0) |
173 | goto exit_unlock; | |
d84ca5b3 | 174 | |
23244985 WS |
175 | val = sprintf(buf, "%u\n", val * data->vref_cached / 1024); |
176 | exit_unlock: | |
177 | mutex_unlock(&data->update_lock); | |
178 | return val; | |
d84ca5b3 WS |
179 | } |
180 | ||
181 | static 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); | |
eac83cd9 AL |
185 | struct adt7411_data *data = dev_get_drvdata(dev); |
186 | struct i2c_client *client = data->client; | |
d84ca5b3 WS |
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 | ||
192 | static 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); | |
eac83cd9 AL |
197 | struct adt7411_data *data = dev_get_drvdata(dev); |
198 | struct i2c_client *client = data->client; | |
d84ca5b3 WS |
199 | int ret; |
200 | unsigned long flag; | |
201 | ||
179c4fdb | 202 | ret = kstrtoul(buf, 0, &flag); |
d84ca5b3 WS |
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 */ | |
23244985 | 209 | mutex_lock(&data->update_lock); |
d84ca5b3 | 210 | data->next_update = jiffies; |
23244985 | 211 | mutex_unlock(&data->update_lock); |
d84ca5b3 WS |
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 | ||
220 | static DEVICE_ATTR(temp1_input, S_IRUGO, adt7411_show_temp, NULL); | |
221 | static DEVICE_ATTR(in0_input, S_IRUGO, adt7411_show_vdd, NULL); | |
222 | static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, adt7411_show_input, NULL, 0); | |
223 | static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, adt7411_show_input, NULL, 1); | |
224 | static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, adt7411_show_input, NULL, 2); | |
225 | static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, adt7411_show_input, NULL, 3); | |
226 | static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, adt7411_show_input, NULL, 4); | |
227 | static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, adt7411_show_input, NULL, 5); | |
228 | static SENSOR_DEVICE_ATTR(in7_input, S_IRUGO, adt7411_show_input, NULL, 6); | |
229 | static SENSOR_DEVICE_ATTR(in8_input, S_IRUGO, adt7411_show_input, NULL, 7); | |
230 | static ADT7411_BIT_ATTR(no_average, ADT7411_REG_CFG2, ADT7411_CFG2_DISABLE_AVG); | |
231 | static ADT7411_BIT_ATTR(fast_sampling, ADT7411_REG_CFG3, ADT7411_CFG3_ADC_CLK_225); | |
232 | static ADT7411_BIT_ATTR(adc_ref_vdd, ADT7411_REG_CFG3, ADT7411_CFG3_REF_VDD); | |
233 | ||
234 | static 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 | ||
eac83cd9 | 251 | ATTRIBUTE_GROUPS(adt7411); |
d84ca5b3 WS |
252 | |
253 | static 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) { | |
b55f3757 GR |
263 | dev_dbg(&client->dev, |
264 | "Wrong manufacturer ID. Got %d, expected %d\n", | |
265 | val, ADT7411_MANUFACTURER_ID); | |
d84ca5b3 WS |
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) { | |
b55f3757 GR |
271 | dev_dbg(&client->dev, |
272 | "Wrong device ID. Got %d, expected %d\n", | |
273 | val, ADT7411_DEVICE_ID); | |
d84ca5b3 WS |
274 | return -ENODEV; |
275 | } | |
276 | ||
277 | strlcpy(info->type, "adt7411", I2C_NAME_SIZE); | |
278 | ||
279 | return 0; | |
280 | } | |
281 | ||
6c931ae1 | 282 | static int adt7411_probe(struct i2c_client *client, |
d84ca5b3 WS |
283 | const struct i2c_device_id *id) |
284 | { | |
eac83cd9 | 285 | struct device *dev = &client->dev; |
d84ca5b3 | 286 | struct adt7411_data *data; |
eac83cd9 | 287 | struct device *hwmon_dev; |
d84ca5b3 WS |
288 | int ret; |
289 | ||
eac83cd9 | 290 | data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); |
d84ca5b3 WS |
291 | if (!data) |
292 | return -ENOMEM; | |
293 | ||
294 | i2c_set_clientdata(client, data); | |
eac83cd9 | 295 | data->client = client; |
d84ca5b3 | 296 | mutex_init(&data->device_lock); |
23244985 | 297 | mutex_init(&data->update_lock); |
d84ca5b3 WS |
298 | |
299 | ret = adt7411_modify_bit(client, ADT7411_REG_CFG1, | |
300 | ADT7411_CFG1_START_MONITOR, 1); | |
301 | if (ret < 0) | |
65ec17b0 | 302 | return ret; |
d84ca5b3 WS |
303 | |
304 | /* force update on first occasion */ | |
305 | data->next_update = jiffies; | |
306 | ||
eac83cd9 AL |
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); | |
d84ca5b3 WS |
311 | } |
312 | ||
313 | static const struct i2c_device_id adt7411_id[] = { | |
314 | { "adt7411", 0 }, | |
315 | { } | |
316 | }; | |
a7254d68 | 317 | MODULE_DEVICE_TABLE(i2c, adt7411_id); |
d84ca5b3 WS |
318 | |
319 | static struct i2c_driver adt7411_driver = { | |
320 | .driver = { | |
321 | .name = "adt7411", | |
322 | }, | |
323 | .probe = adt7411_probe, | |
d84ca5b3 WS |
324 | .id_table = adt7411_id, |
325 | .detect = adt7411_detect, | |
326 | .address_list = normal_i2c, | |
327 | .class = I2C_CLASS_HWMON, | |
328 | }; | |
329 | ||
f0967eea | 330 | module_i2c_driver(adt7411_driver); |
d84ca5b3 WS |
331 | |
332 | MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de> and " | |
333 | "Wolfram Sang <w.sang@pengutronix.de>"); | |
334 | MODULE_DESCRIPTION("ADT7411 driver"); | |
335 | MODULE_LICENSE("GPL v2"); |