Commit | Line | Data |
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c942fddf | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
b4c9c1a7 GR |
2 | /* |
3 | * Driver for TI ADC128D818 System Monitor with Temperature Sensor | |
4 | * | |
5 | * Copyright (c) 2014 Guenter Roeck | |
6 | * | |
7 | * Derived from lm80.c | |
8 | * Copyright (C) 1998, 1999 Frodo Looijaard <frodol@dds.nl> | |
9 | * and Philip Edelbrock <phil@netroedge.com> | |
b4c9c1a7 GR |
10 | */ |
11 | ||
12 | #include <linux/module.h> | |
13 | #include <linux/slab.h> | |
14 | #include <linux/jiffies.h> | |
15 | #include <linux/i2c.h> | |
16 | #include <linux/hwmon.h> | |
17 | #include <linux/hwmon-sysfs.h> | |
18 | #include <linux/err.h> | |
19 | #include <linux/regulator/consumer.h> | |
20 | #include <linux/mutex.h> | |
2c3b1189 | 21 | #include <linux/bitops.h> |
a45923c2 | 22 | #include <linux/of.h> |
b4c9c1a7 GR |
23 | |
24 | /* Addresses to scan | |
25 | * The chip also supports addresses 0x35..0x37. Don't scan those addresses | |
26 | * since they are also used by some EEPROMs, which may result in false | |
27 | * positives. | |
28 | */ | |
29 | static const unsigned short normal_i2c[] = { | |
30 | 0x1d, 0x1e, 0x1f, 0x2d, 0x2e, 0x2f, I2C_CLIENT_END }; | |
31 | ||
32 | /* registers */ | |
33 | #define ADC128_REG_IN_MAX(nr) (0x2a + (nr) * 2) | |
34 | #define ADC128_REG_IN_MIN(nr) (0x2b + (nr) * 2) | |
35 | #define ADC128_REG_IN(nr) (0x20 + (nr)) | |
36 | ||
37 | #define ADC128_REG_TEMP 0x27 | |
38 | #define ADC128_REG_TEMP_MAX 0x38 | |
39 | #define ADC128_REG_TEMP_HYST 0x39 | |
40 | ||
41 | #define ADC128_REG_CONFIG 0x00 | |
42 | #define ADC128_REG_ALARM 0x01 | |
43 | #define ADC128_REG_MASK 0x03 | |
44 | #define ADC128_REG_CONV_RATE 0x07 | |
45 | #define ADC128_REG_ONESHOT 0x09 | |
46 | #define ADC128_REG_SHUTDOWN 0x0a | |
47 | #define ADC128_REG_CONFIG_ADV 0x0b | |
48 | #define ADC128_REG_BUSY_STATUS 0x0c | |
49 | ||
50 | #define ADC128_REG_MAN_ID 0x3e | |
51 | #define ADC128_REG_DEV_ID 0x3f | |
52 | ||
4e1796c8 AK |
53 | /* No. of voltage entries in adc128_attrs */ |
54 | #define ADC128_ATTR_NUM_VOLT (8 * 4) | |
55 | ||
56 | /* Voltage inputs visible per operation mode */ | |
57 | static const u8 num_inputs[] = { 7, 8, 4, 6 }; | |
58 | ||
b4c9c1a7 GR |
59 | struct adc128_data { |
60 | struct i2c_client *client; | |
b4c9c1a7 GR |
61 | int vref; /* Reference voltage in mV */ |
62 | struct mutex update_lock; | |
a45923c2 | 63 | u8 mode; /* Operation mode */ |
b4c9c1a7 GR |
64 | bool valid; /* true if following fields are valid */ |
65 | unsigned long last_updated; /* In jiffies */ | |
66 | ||
4e1796c8 | 67 | u16 in[3][8]; /* Register value, normalized to 12 bit |
b4c9c1a7 GR |
68 | * 0: input voltage |
69 | * 1: min limit | |
70 | * 2: max limit | |
71 | */ | |
72 | s16 temp[3]; /* Register value, normalized to 9 bit | |
73 | * 0: sensor 1: limit 2: hyst | |
74 | */ | |
75 | u8 alarms; /* alarm register value */ | |
76 | }; | |
77 | ||
78 | static struct adc128_data *adc128_update_device(struct device *dev) | |
79 | { | |
80 | struct adc128_data *data = dev_get_drvdata(dev); | |
81 | struct i2c_client *client = data->client; | |
82 | struct adc128_data *ret = data; | |
83 | int i, rv; | |
84 | ||
85 | mutex_lock(&data->update_lock); | |
86 | ||
87 | if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { | |
4e1796c8 | 88 | for (i = 0; i < num_inputs[data->mode]; i++) { |
b4c9c1a7 GR |
89 | rv = i2c_smbus_read_word_swapped(client, |
90 | ADC128_REG_IN(i)); | |
91 | if (rv < 0) | |
92 | goto abort; | |
93 | data->in[0][i] = rv >> 4; | |
94 | ||
95 | rv = i2c_smbus_read_byte_data(client, | |
96 | ADC128_REG_IN_MIN(i)); | |
97 | if (rv < 0) | |
98 | goto abort; | |
99 | data->in[1][i] = rv << 4; | |
100 | ||
101 | rv = i2c_smbus_read_byte_data(client, | |
102 | ADC128_REG_IN_MAX(i)); | |
103 | if (rv < 0) | |
104 | goto abort; | |
105 | data->in[2][i] = rv << 4; | |
106 | } | |
107 | ||
4e1796c8 AK |
108 | if (data->mode != 1) { |
109 | rv = i2c_smbus_read_word_swapped(client, | |
110 | ADC128_REG_TEMP); | |
111 | if (rv < 0) | |
112 | goto abort; | |
113 | data->temp[0] = rv >> 7; | |
b4c9c1a7 | 114 | |
4e1796c8 AK |
115 | rv = i2c_smbus_read_byte_data(client, |
116 | ADC128_REG_TEMP_MAX); | |
117 | if (rv < 0) | |
118 | goto abort; | |
119 | data->temp[1] = rv << 1; | |
b4c9c1a7 | 120 | |
4e1796c8 AK |
121 | rv = i2c_smbus_read_byte_data(client, |
122 | ADC128_REG_TEMP_HYST); | |
123 | if (rv < 0) | |
124 | goto abort; | |
125 | data->temp[2] = rv << 1; | |
126 | } | |
b4c9c1a7 GR |
127 | |
128 | rv = i2c_smbus_read_byte_data(client, ADC128_REG_ALARM); | |
129 | if (rv < 0) | |
130 | goto abort; | |
131 | data->alarms |= rv; | |
132 | ||
133 | data->last_updated = jiffies; | |
134 | data->valid = true; | |
135 | } | |
136 | goto done; | |
137 | ||
138 | abort: | |
139 | ret = ERR_PTR(rv); | |
140 | data->valid = false; | |
141 | done: | |
142 | mutex_unlock(&data->update_lock); | |
143 | return ret; | |
144 | } | |
145 | ||
0594462f GR |
146 | static ssize_t adc128_in_show(struct device *dev, |
147 | struct device_attribute *attr, char *buf) | |
b4c9c1a7 GR |
148 | { |
149 | struct adc128_data *data = adc128_update_device(dev); | |
150 | int index = to_sensor_dev_attr_2(attr)->index; | |
151 | int nr = to_sensor_dev_attr_2(attr)->nr; | |
152 | int val; | |
153 | ||
154 | if (IS_ERR(data)) | |
155 | return PTR_ERR(data); | |
156 | ||
157 | val = DIV_ROUND_CLOSEST(data->in[index][nr] * data->vref, 4095); | |
158 | return sprintf(buf, "%d\n", val); | |
159 | } | |
160 | ||
0594462f GR |
161 | static ssize_t adc128_in_store(struct device *dev, |
162 | struct device_attribute *attr, const char *buf, | |
163 | size_t count) | |
b4c9c1a7 GR |
164 | { |
165 | struct adc128_data *data = dev_get_drvdata(dev); | |
166 | int index = to_sensor_dev_attr_2(attr)->index; | |
167 | int nr = to_sensor_dev_attr_2(attr)->nr; | |
168 | u8 reg, regval; | |
169 | long val; | |
170 | int err; | |
171 | ||
172 | err = kstrtol(buf, 10, &val); | |
173 | if (err < 0) | |
174 | return err; | |
175 | ||
176 | mutex_lock(&data->update_lock); | |
177 | /* 10 mV LSB on limit registers */ | |
8cad724c | 178 | regval = DIV_ROUND_CLOSEST(clamp_val(val, 0, 2550), 10); |
b4c9c1a7 GR |
179 | data->in[index][nr] = regval << 4; |
180 | reg = index == 1 ? ADC128_REG_IN_MIN(nr) : ADC128_REG_IN_MAX(nr); | |
181 | i2c_smbus_write_byte_data(data->client, reg, regval); | |
182 | mutex_unlock(&data->update_lock); | |
183 | ||
184 | return count; | |
185 | } | |
186 | ||
0594462f | 187 | static ssize_t adc128_temp_show(struct device *dev, |
b4c9c1a7 GR |
188 | struct device_attribute *attr, char *buf) |
189 | { | |
190 | struct adc128_data *data = adc128_update_device(dev); | |
191 | int index = to_sensor_dev_attr(attr)->index; | |
192 | int temp; | |
193 | ||
194 | if (IS_ERR(data)) | |
195 | return PTR_ERR(data); | |
196 | ||
2c3b1189 | 197 | temp = sign_extend32(data->temp[index], 8); |
b4c9c1a7 GR |
198 | return sprintf(buf, "%d\n", temp * 500);/* 0.5 degrees C resolution */ |
199 | } | |
200 | ||
0594462f GR |
201 | static ssize_t adc128_temp_store(struct device *dev, |
202 | struct device_attribute *attr, | |
203 | const char *buf, size_t count) | |
b4c9c1a7 GR |
204 | { |
205 | struct adc128_data *data = dev_get_drvdata(dev); | |
206 | int index = to_sensor_dev_attr(attr)->index; | |
207 | long val; | |
208 | int err; | |
209 | s8 regval; | |
210 | ||
211 | err = kstrtol(buf, 10, &val); | |
212 | if (err < 0) | |
213 | return err; | |
214 | ||
215 | mutex_lock(&data->update_lock); | |
8cad724c | 216 | regval = DIV_ROUND_CLOSEST(clamp_val(val, -128000, 127000), 1000); |
b4c9c1a7 GR |
217 | data->temp[index] = regval << 1; |
218 | i2c_smbus_write_byte_data(data->client, | |
219 | index == 1 ? ADC128_REG_TEMP_MAX | |
220 | : ADC128_REG_TEMP_HYST, | |
221 | regval); | |
222 | mutex_unlock(&data->update_lock); | |
223 | ||
224 | return count; | |
225 | } | |
226 | ||
0594462f | 227 | static ssize_t adc128_alarm_show(struct device *dev, |
b4c9c1a7 GR |
228 | struct device_attribute *attr, char *buf) |
229 | { | |
230 | struct adc128_data *data = adc128_update_device(dev); | |
231 | int mask = 1 << to_sensor_dev_attr(attr)->index; | |
232 | u8 alarms; | |
233 | ||
234 | if (IS_ERR(data)) | |
235 | return PTR_ERR(data); | |
236 | ||
237 | /* | |
238 | * Clear an alarm after reporting it to user space. If it is still | |
239 | * active, the next update sequence will set the alarm bit again. | |
240 | */ | |
241 | alarms = data->alarms; | |
242 | data->alarms &= ~mask; | |
243 | ||
244 | return sprintf(buf, "%u\n", !!(alarms & mask)); | |
245 | } | |
246 | ||
4e1796c8 AK |
247 | static umode_t adc128_is_visible(struct kobject *kobj, |
248 | struct attribute *attr, int index) | |
249 | { | |
9d2227bb | 250 | struct device *dev = kobj_to_dev(kobj); |
4e1796c8 AK |
251 | struct adc128_data *data = dev_get_drvdata(dev); |
252 | ||
253 | if (index < ADC128_ATTR_NUM_VOLT) { | |
254 | /* Voltage, visible according to num_inputs[] */ | |
255 | if (index >= num_inputs[data->mode] * 4) | |
256 | return 0; | |
257 | } else { | |
258 | /* Temperature, visible if not in mode 1 */ | |
259 | if (data->mode == 1) | |
260 | return 0; | |
261 | } | |
262 | ||
263 | return attr->mode; | |
264 | } | |
265 | ||
0594462f GR |
266 | static SENSOR_DEVICE_ATTR_2_RO(in0_input, adc128_in, 0, 0); |
267 | static SENSOR_DEVICE_ATTR_2_RW(in0_min, adc128_in, 0, 1); | |
268 | static SENSOR_DEVICE_ATTR_2_RW(in0_max, adc128_in, 0, 2); | |
269 | ||
270 | static SENSOR_DEVICE_ATTR_2_RO(in1_input, adc128_in, 1, 0); | |
271 | static SENSOR_DEVICE_ATTR_2_RW(in1_min, adc128_in, 1, 1); | |
272 | static SENSOR_DEVICE_ATTR_2_RW(in1_max, adc128_in, 1, 2); | |
273 | ||
274 | static SENSOR_DEVICE_ATTR_2_RO(in2_input, adc128_in, 2, 0); | |
275 | static SENSOR_DEVICE_ATTR_2_RW(in2_min, adc128_in, 2, 1); | |
276 | static SENSOR_DEVICE_ATTR_2_RW(in2_max, adc128_in, 2, 2); | |
277 | ||
278 | static SENSOR_DEVICE_ATTR_2_RO(in3_input, adc128_in, 3, 0); | |
279 | static SENSOR_DEVICE_ATTR_2_RW(in3_min, adc128_in, 3, 1); | |
280 | static SENSOR_DEVICE_ATTR_2_RW(in3_max, adc128_in, 3, 2); | |
281 | ||
282 | static SENSOR_DEVICE_ATTR_2_RO(in4_input, adc128_in, 4, 0); | |
283 | static SENSOR_DEVICE_ATTR_2_RW(in4_min, adc128_in, 4, 1); | |
284 | static SENSOR_DEVICE_ATTR_2_RW(in4_max, adc128_in, 4, 2); | |
285 | ||
286 | static SENSOR_DEVICE_ATTR_2_RO(in5_input, adc128_in, 5, 0); | |
287 | static SENSOR_DEVICE_ATTR_2_RW(in5_min, adc128_in, 5, 1); | |
288 | static SENSOR_DEVICE_ATTR_2_RW(in5_max, adc128_in, 5, 2); | |
289 | ||
290 | static SENSOR_DEVICE_ATTR_2_RO(in6_input, adc128_in, 6, 0); | |
291 | static SENSOR_DEVICE_ATTR_2_RW(in6_min, adc128_in, 6, 1); | |
292 | static SENSOR_DEVICE_ATTR_2_RW(in6_max, adc128_in, 6, 2); | |
293 | ||
294 | static SENSOR_DEVICE_ATTR_2_RO(in7_input, adc128_in, 7, 0); | |
295 | static SENSOR_DEVICE_ATTR_2_RW(in7_min, adc128_in, 7, 1); | |
296 | static SENSOR_DEVICE_ATTR_2_RW(in7_max, adc128_in, 7, 2); | |
297 | ||
298 | static SENSOR_DEVICE_ATTR_RO(temp1_input, adc128_temp, 0); | |
299 | static SENSOR_DEVICE_ATTR_RW(temp1_max, adc128_temp, 1); | |
300 | static SENSOR_DEVICE_ATTR_RW(temp1_max_hyst, adc128_temp, 2); | |
301 | ||
302 | static SENSOR_DEVICE_ATTR_RO(in0_alarm, adc128_alarm, 0); | |
303 | static SENSOR_DEVICE_ATTR_RO(in1_alarm, adc128_alarm, 1); | |
304 | static SENSOR_DEVICE_ATTR_RO(in2_alarm, adc128_alarm, 2); | |
305 | static SENSOR_DEVICE_ATTR_RO(in3_alarm, adc128_alarm, 3); | |
306 | static SENSOR_DEVICE_ATTR_RO(in4_alarm, adc128_alarm, 4); | |
307 | static SENSOR_DEVICE_ATTR_RO(in5_alarm, adc128_alarm, 5); | |
308 | static SENSOR_DEVICE_ATTR_RO(in6_alarm, adc128_alarm, 6); | |
309 | static SENSOR_DEVICE_ATTR_RO(in7_alarm, adc128_alarm, 7); | |
310 | static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, adc128_alarm, 7); | |
b4c9c1a7 GR |
311 | |
312 | static struct attribute *adc128_attrs[] = { | |
4e1796c8 | 313 | &sensor_dev_attr_in0_alarm.dev_attr.attr, |
b4c9c1a7 | 314 | &sensor_dev_attr_in0_input.dev_attr.attr, |
4e1796c8 AK |
315 | &sensor_dev_attr_in0_max.dev_attr.attr, |
316 | &sensor_dev_attr_in0_min.dev_attr.attr, | |
317 | &sensor_dev_attr_in1_alarm.dev_attr.attr, | |
b4c9c1a7 | 318 | &sensor_dev_attr_in1_input.dev_attr.attr, |
4e1796c8 AK |
319 | &sensor_dev_attr_in1_max.dev_attr.attr, |
320 | &sensor_dev_attr_in1_min.dev_attr.attr, | |
321 | &sensor_dev_attr_in2_alarm.dev_attr.attr, | |
b4c9c1a7 | 322 | &sensor_dev_attr_in2_input.dev_attr.attr, |
4e1796c8 AK |
323 | &sensor_dev_attr_in2_max.dev_attr.attr, |
324 | &sensor_dev_attr_in2_min.dev_attr.attr, | |
325 | &sensor_dev_attr_in3_alarm.dev_attr.attr, | |
b4c9c1a7 | 326 | &sensor_dev_attr_in3_input.dev_attr.attr, |
4e1796c8 AK |
327 | &sensor_dev_attr_in3_max.dev_attr.attr, |
328 | &sensor_dev_attr_in3_min.dev_attr.attr, | |
329 | &sensor_dev_attr_in4_alarm.dev_attr.attr, | |
b4c9c1a7 | 330 | &sensor_dev_attr_in4_input.dev_attr.attr, |
4e1796c8 AK |
331 | &sensor_dev_attr_in4_max.dev_attr.attr, |
332 | &sensor_dev_attr_in4_min.dev_attr.attr, | |
333 | &sensor_dev_attr_in5_alarm.dev_attr.attr, | |
b4c9c1a7 | 334 | &sensor_dev_attr_in5_input.dev_attr.attr, |
4e1796c8 AK |
335 | &sensor_dev_attr_in5_max.dev_attr.attr, |
336 | &sensor_dev_attr_in5_min.dev_attr.attr, | |
337 | &sensor_dev_attr_in6_alarm.dev_attr.attr, | |
b4c9c1a7 | 338 | &sensor_dev_attr_in6_input.dev_attr.attr, |
4e1796c8 AK |
339 | &sensor_dev_attr_in6_max.dev_attr.attr, |
340 | &sensor_dev_attr_in6_min.dev_attr.attr, | |
341 | &sensor_dev_attr_in7_alarm.dev_attr.attr, | |
342 | &sensor_dev_attr_in7_input.dev_attr.attr, | |
343 | &sensor_dev_attr_in7_max.dev_attr.attr, | |
344 | &sensor_dev_attr_in7_min.dev_attr.attr, | |
b4c9c1a7 GR |
345 | &sensor_dev_attr_temp1_input.dev_attr.attr, |
346 | &sensor_dev_attr_temp1_max.dev_attr.attr, | |
b4c9c1a7 | 347 | &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, |
4e1796c8 | 348 | &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, |
b4c9c1a7 GR |
349 | NULL |
350 | }; | |
4e1796c8 | 351 | |
33d62d11 | 352 | static const struct attribute_group adc128_group = { |
4e1796c8 AK |
353 | .attrs = adc128_attrs, |
354 | .is_visible = adc128_is_visible, | |
355 | }; | |
356 | __ATTRIBUTE_GROUPS(adc128); | |
b4c9c1a7 GR |
357 | |
358 | static int adc128_detect(struct i2c_client *client, struct i2c_board_info *info) | |
359 | { | |
360 | int man_id, dev_id; | |
361 | ||
362 | if (!i2c_check_functionality(client->adapter, | |
363 | I2C_FUNC_SMBUS_BYTE_DATA | | |
364 | I2C_FUNC_SMBUS_WORD_DATA)) | |
365 | return -ENODEV; | |
366 | ||
367 | man_id = i2c_smbus_read_byte_data(client, ADC128_REG_MAN_ID); | |
368 | dev_id = i2c_smbus_read_byte_data(client, ADC128_REG_DEV_ID); | |
369 | if (man_id != 0x01 || dev_id != 0x09) | |
370 | return -ENODEV; | |
371 | ||
372 | /* Check unused bits for confirmation */ | |
373 | if (i2c_smbus_read_byte_data(client, ADC128_REG_CONFIG) & 0xf4) | |
374 | return -ENODEV; | |
375 | if (i2c_smbus_read_byte_data(client, ADC128_REG_CONV_RATE) & 0xfe) | |
376 | return -ENODEV; | |
377 | if (i2c_smbus_read_byte_data(client, ADC128_REG_ONESHOT) & 0xfe) | |
378 | return -ENODEV; | |
379 | if (i2c_smbus_read_byte_data(client, ADC128_REG_SHUTDOWN) & 0xfe) | |
380 | return -ENODEV; | |
381 | if (i2c_smbus_read_byte_data(client, ADC128_REG_CONFIG_ADV) & 0xf8) | |
382 | return -ENODEV; | |
383 | if (i2c_smbus_read_byte_data(client, ADC128_REG_BUSY_STATUS) & 0xfc) | |
384 | return -ENODEV; | |
385 | ||
f2f394db | 386 | strscpy(info->type, "adc128d818", I2C_NAME_SIZE); |
b4c9c1a7 GR |
387 | |
388 | return 0; | |
389 | } | |
390 | ||
cffb8d74 | 391 | static int adc128_init_client(struct adc128_data *data, bool external_vref) |
b4c9c1a7 GR |
392 | { |
393 | struct i2c_client *client = data->client; | |
394 | int err; | |
e2f75e6b | 395 | u8 regval = 0x0; |
b4c9c1a7 GR |
396 | |
397 | /* | |
398 | * Reset chip to defaults. | |
399 | * This makes most other initializations unnecessary. | |
400 | */ | |
401 | err = i2c_smbus_write_byte_data(client, ADC128_REG_CONFIG, 0x80); | |
402 | if (err) | |
403 | return err; | |
404 | ||
a45923c2 | 405 | /* Set operation mode, if non-default */ |
e2f75e6b RD |
406 | if (data->mode != 0) |
407 | regval |= data->mode << 1; | |
408 | ||
409 | /* If external vref is selected, configure the chip to use it */ | |
cffb8d74 | 410 | if (external_vref) |
e2f75e6b RD |
411 | regval |= 0x01; |
412 | ||
413 | /* Write advanced configuration register */ | |
414 | if (regval != 0x0) { | |
415 | err = i2c_smbus_write_byte_data(client, ADC128_REG_CONFIG_ADV, | |
416 | regval); | |
a45923c2 AK |
417 | if (err) |
418 | return err; | |
419 | } | |
420 | ||
b4c9c1a7 GR |
421 | /* Start monitoring */ |
422 | err = i2c_smbus_write_byte_data(client, ADC128_REG_CONFIG, 0x01); | |
423 | if (err) | |
424 | return err; | |
425 | ||
b4c9c1a7 GR |
426 | return 0; |
427 | } | |
428 | ||
673afe46 | 429 | static int adc128_probe(struct i2c_client *client) |
b4c9c1a7 GR |
430 | { |
431 | struct device *dev = &client->dev; | |
b4c9c1a7 GR |
432 | struct device *hwmon_dev; |
433 | struct adc128_data *data; | |
cffb8d74 | 434 | bool external_vref; |
b4c9c1a7 GR |
435 | int err, vref; |
436 | ||
437 | data = devm_kzalloc(dev, sizeof(struct adc128_data), GFP_KERNEL); | |
438 | if (!data) | |
439 | return -ENOMEM; | |
440 | ||
441 | /* vref is optional. If specified, is used as chip reference voltage */ | |
cffb8d74 DL |
442 | vref = devm_regulator_get_enable_read_voltage(dev, "vref"); |
443 | if (vref == -ENODEV) { | |
444 | external_vref = false; | |
b4c9c1a7 | 445 | data->vref = 2560; /* 2.56V, in mV */ |
cffb8d74 DL |
446 | } else if (vref < 0) { |
447 | return vref; | |
448 | } else { | |
449 | external_vref = true; | |
450 | data->vref = DIV_ROUND_CLOSEST(vref, 1000); | |
b4c9c1a7 GR |
451 | } |
452 | ||
c72eeabd | 453 | /* Operation mode is optional. If unspecified, keep current mode */ |
a45923c2 | 454 | if (of_property_read_u8(dev->of_node, "ti,mode", &data->mode) == 0) { |
4e1796c8 AK |
455 | if (data->mode > 3) { |
456 | dev_err(dev, "invalid operation mode %d\n", | |
a45923c2 | 457 | data->mode); |
cffb8d74 | 458 | return -EINVAL; |
a45923c2 AK |
459 | } |
460 | } else { | |
c72eeabd AK |
461 | err = i2c_smbus_read_byte_data(client, ADC128_REG_CONFIG_ADV); |
462 | if (err < 0) | |
cffb8d74 | 463 | return err; |
c72eeabd | 464 | data->mode = (err >> 1) & ADC128_REG_MASK; |
a45923c2 AK |
465 | } |
466 | ||
b4c9c1a7 GR |
467 | data->client = client; |
468 | i2c_set_clientdata(client, data); | |
469 | mutex_init(&data->update_lock); | |
470 | ||
471 | /* Initialize the chip */ | |
cffb8d74 | 472 | err = adc128_init_client(data, external_vref); |
b4c9c1a7 | 473 | if (err < 0) |
cffb8d74 | 474 | return err; |
b4c9c1a7 GR |
475 | |
476 | hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, | |
477 | data, adc128_groups); | |
b4c9c1a7 | 478 | |
346fe0ce | 479 | return PTR_ERR_OR_ZERO(hwmon_dev); |
b4c9c1a7 GR |
480 | } |
481 | ||
482 | static const struct i2c_device_id adc128_id[] = { | |
d8a66f36 | 483 | { "adc128d818" }, |
b4c9c1a7 GR |
484 | { } |
485 | }; | |
486 | MODULE_DEVICE_TABLE(i2c, adc128_id); | |
487 | ||
462d7e7e | 488 | static const struct of_device_id __maybe_unused adc128_of_match[] = { |
d593e665 JMC |
489 | { .compatible = "ti,adc128d818" }, |
490 | { }, | |
491 | }; | |
492 | MODULE_DEVICE_TABLE(of, adc128_of_match); | |
493 | ||
b4c9c1a7 GR |
494 | static struct i2c_driver adc128_driver = { |
495 | .class = I2C_CLASS_HWMON, | |
496 | .driver = { | |
497 | .name = "adc128d818", | |
d593e665 | 498 | .of_match_table = of_match_ptr(adc128_of_match), |
b4c9c1a7 | 499 | }, |
1975d167 | 500 | .probe = adc128_probe, |
b4c9c1a7 GR |
501 | .id_table = adc128_id, |
502 | .detect = adc128_detect, | |
503 | .address_list = normal_i2c, | |
504 | }; | |
505 | ||
506 | module_i2c_driver(adc128_driver); | |
507 | ||
508 | MODULE_AUTHOR("Guenter Roeck"); | |
509 | MODULE_DESCRIPTION("Driver for ADC128D818"); | |
510 | MODULE_LICENSE("GPL"); |