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502b5a01 GR |
1 | /* |
2 | * Driver for Lineage Compact Power Line series of power entry modules. | |
3 | * | |
4 | * Copyright (C) 2010, 2011 Ericsson AB. | |
5 | * | |
6 | * Documentation: | |
7 | * http://www.lineagepower.com/oem/pdf/CPLI2C.pdf | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to the Free Software | |
21 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
22 | */ | |
23 | ||
24 | #include <linux/kernel.h> | |
25 | #include <linux/module.h> | |
26 | #include <linux/init.h> | |
27 | #include <linux/err.h> | |
28 | #include <linux/slab.h> | |
29 | #include <linux/i2c.h> | |
30 | #include <linux/hwmon.h> | |
31 | #include <linux/hwmon-sysfs.h> | |
dcd8f392 | 32 | #include <linux/jiffies.h> |
502b5a01 GR |
33 | |
34 | /* | |
35 | * This driver supports various Lineage Compact Power Line DC/DC and AC/DC | |
36 | * converters such as CP1800, CP2000AC, CP2000DC, CP2100DC, and others. | |
37 | * | |
38 | * The devices are nominally PMBus compliant. However, most standard PMBus | |
39 | * commands are not supported. Specifically, all hardware monitoring and | |
40 | * status reporting commands are non-standard. For this reason, a standard | |
41 | * PMBus driver can not be used. | |
42 | * | |
43 | * All Lineage CPL devices have a built-in I2C bus master selector (PCA9541). | |
44 | * To ensure device access, this driver should only be used as client driver | |
45 | * to the pca9541 I2C master selector driver. | |
46 | */ | |
47 | ||
48 | /* Command codes */ | |
49 | #define PEM_OPERATION 0x01 | |
50 | #define PEM_CLEAR_INFO_FLAGS 0x03 | |
51 | #define PEM_VOUT_COMMAND 0x21 | |
52 | #define PEM_VOUT_OV_FAULT_LIMIT 0x40 | |
53 | #define PEM_READ_DATA_STRING 0xd0 | |
54 | #define PEM_READ_INPUT_STRING 0xdc | |
55 | #define PEM_READ_FIRMWARE_REV 0xdd | |
56 | #define PEM_READ_RUN_TIMER 0xde | |
57 | #define PEM_FAN_HI_SPEED 0xdf | |
58 | #define PEM_FAN_NORMAL_SPEED 0xe0 | |
59 | #define PEM_READ_FAN_SPEED 0xe1 | |
60 | ||
61 | /* offsets in data string */ | |
62 | #define PEM_DATA_STATUS_2 0 | |
63 | #define PEM_DATA_STATUS_1 1 | |
64 | #define PEM_DATA_ALARM_2 2 | |
65 | #define PEM_DATA_ALARM_1 3 | |
66 | #define PEM_DATA_VOUT_LSB 4 | |
67 | #define PEM_DATA_VOUT_MSB 5 | |
68 | #define PEM_DATA_CURRENT 6 | |
69 | #define PEM_DATA_TEMP 7 | |
70 | ||
71 | /* Virtual entries, to report constants */ | |
72 | #define PEM_DATA_TEMP_MAX 10 | |
73 | #define PEM_DATA_TEMP_CRIT 11 | |
74 | ||
75 | /* offsets in input string */ | |
76 | #define PEM_INPUT_VOLTAGE 0 | |
77 | #define PEM_INPUT_POWER_LSB 1 | |
78 | #define PEM_INPUT_POWER_MSB 2 | |
79 | ||
80 | /* offsets in fan data */ | |
81 | #define PEM_FAN_ADJUSTMENT 0 | |
82 | #define PEM_FAN_FAN1 1 | |
83 | #define PEM_FAN_FAN2 2 | |
84 | #define PEM_FAN_FAN3 3 | |
85 | ||
86 | /* Status register bits */ | |
87 | #define STS1_OUTPUT_ON (1 << 0) | |
88 | #define STS1_LEDS_FLASHING (1 << 1) | |
89 | #define STS1_EXT_FAULT (1 << 2) | |
90 | #define STS1_SERVICE_LED_ON (1 << 3) | |
91 | #define STS1_SHUTDOWN_OCCURRED (1 << 4) | |
92 | #define STS1_INT_FAULT (1 << 5) | |
93 | #define STS1_ISOLATION_TEST_OK (1 << 6) | |
94 | ||
95 | #define STS2_ENABLE_PIN_HI (1 << 0) | |
96 | #define STS2_DATA_OUT_RANGE (1 << 1) | |
97 | #define STS2_RESTARTED_OK (1 << 1) | |
98 | #define STS2_ISOLATION_TEST_FAIL (1 << 3) | |
99 | #define STS2_HIGH_POWER_CAP (1 << 4) | |
100 | #define STS2_INVALID_INSTR (1 << 5) | |
101 | #define STS2_WILL_RESTART (1 << 6) | |
102 | #define STS2_PEC_ERR (1 << 7) | |
103 | ||
104 | /* Alarm register bits */ | |
105 | #define ALRM1_VIN_OUT_LIMIT (1 << 0) | |
106 | #define ALRM1_VOUT_OUT_LIMIT (1 << 1) | |
107 | #define ALRM1_OV_VOLT_SHUTDOWN (1 << 2) | |
108 | #define ALRM1_VIN_OVERCURRENT (1 << 3) | |
109 | #define ALRM1_TEMP_WARNING (1 << 4) | |
110 | #define ALRM1_TEMP_SHUTDOWN (1 << 5) | |
111 | #define ALRM1_PRIMARY_FAULT (1 << 6) | |
112 | #define ALRM1_POWER_LIMIT (1 << 7) | |
113 | ||
114 | #define ALRM2_5V_OUT_LIMIT (1 << 1) | |
115 | #define ALRM2_TEMP_FAULT (1 << 2) | |
116 | #define ALRM2_OV_LOW (1 << 3) | |
117 | #define ALRM2_DCDC_TEMP_HIGH (1 << 4) | |
118 | #define ALRM2_PRI_TEMP_HIGH (1 << 5) | |
119 | #define ALRM2_NO_PRIMARY (1 << 6) | |
120 | #define ALRM2_FAN_FAULT (1 << 7) | |
121 | ||
122 | #define FIRMWARE_REV_LEN 4 | |
123 | #define DATA_STRING_LEN 9 | |
124 | #define INPUT_STRING_LEN 5 /* 4 for most devices */ | |
125 | #define FAN_SPEED_LEN 5 | |
126 | ||
127 | struct pem_data { | |
82803252 AL |
128 | struct i2c_client *client; |
129 | const struct attribute_group *groups[4]; | |
502b5a01 GR |
130 | |
131 | struct mutex update_lock; | |
132 | bool valid; | |
133 | bool fans_supported; | |
134 | int input_length; | |
135 | unsigned long last_updated; /* in jiffies */ | |
136 | ||
137 | u8 firmware_rev[FIRMWARE_REV_LEN]; | |
138 | u8 data_string[DATA_STRING_LEN]; | |
139 | u8 input_string[INPUT_STRING_LEN]; | |
140 | u8 fan_speed[FAN_SPEED_LEN]; | |
141 | }; | |
142 | ||
143 | static int pem_read_block(struct i2c_client *client, u8 command, u8 *data, | |
144 | int data_len) | |
145 | { | |
146 | u8 block_buffer[I2C_SMBUS_BLOCK_MAX]; | |
147 | int result; | |
148 | ||
149 | result = i2c_smbus_read_block_data(client, command, block_buffer); | |
150 | if (unlikely(result < 0)) | |
151 | goto abort; | |
152 | if (unlikely(result == 0xff || result != data_len)) { | |
153 | result = -EIO; | |
154 | goto abort; | |
155 | } | |
156 | memcpy(data, block_buffer, data_len); | |
157 | result = 0; | |
158 | abort: | |
159 | return result; | |
160 | } | |
161 | ||
162 | static struct pem_data *pem_update_device(struct device *dev) | |
163 | { | |
82803252 AL |
164 | struct pem_data *data = dev_get_drvdata(dev); |
165 | struct i2c_client *client = data->client; | |
502b5a01 GR |
166 | struct pem_data *ret = data; |
167 | ||
168 | mutex_lock(&data->update_lock); | |
169 | ||
170 | if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { | |
171 | int result; | |
172 | ||
173 | /* Read data string */ | |
174 | result = pem_read_block(client, PEM_READ_DATA_STRING, | |
175 | data->data_string, | |
176 | sizeof(data->data_string)); | |
177 | if (unlikely(result < 0)) { | |
178 | ret = ERR_PTR(result); | |
179 | goto abort; | |
180 | } | |
181 | ||
182 | /* Read input string */ | |
183 | if (data->input_length) { | |
184 | result = pem_read_block(client, PEM_READ_INPUT_STRING, | |
185 | data->input_string, | |
186 | data->input_length); | |
187 | if (unlikely(result < 0)) { | |
188 | ret = ERR_PTR(result); | |
189 | goto abort; | |
190 | } | |
191 | } | |
192 | ||
193 | /* Read fan speeds */ | |
194 | if (data->fans_supported) { | |
195 | result = pem_read_block(client, PEM_READ_FAN_SPEED, | |
196 | data->fan_speed, | |
197 | sizeof(data->fan_speed)); | |
198 | if (unlikely(result < 0)) { | |
199 | ret = ERR_PTR(result); | |
200 | goto abort; | |
201 | } | |
202 | } | |
203 | ||
204 | i2c_smbus_write_byte(client, PEM_CLEAR_INFO_FLAGS); | |
205 | ||
206 | data->last_updated = jiffies; | |
207 | data->valid = 1; | |
208 | } | |
209 | abort: | |
210 | mutex_unlock(&data->update_lock); | |
211 | return ret; | |
212 | } | |
213 | ||
214 | static long pem_get_data(u8 *data, int len, int index) | |
215 | { | |
216 | long val; | |
217 | ||
218 | switch (index) { | |
219 | case PEM_DATA_VOUT_LSB: | |
220 | val = (data[index] + (data[index+1] << 8)) * 5 / 2; | |
221 | break; | |
222 | case PEM_DATA_CURRENT: | |
223 | val = data[index] * 200; | |
224 | break; | |
225 | case PEM_DATA_TEMP: | |
226 | val = data[index] * 1000; | |
227 | break; | |
228 | case PEM_DATA_TEMP_MAX: | |
229 | val = 97 * 1000; /* 97 degrees C per datasheet */ | |
230 | break; | |
231 | case PEM_DATA_TEMP_CRIT: | |
232 | val = 107 * 1000; /* 107 degrees C per datasheet */ | |
233 | break; | |
234 | default: | |
235 | WARN_ON_ONCE(1); | |
236 | val = 0; | |
237 | } | |
238 | return val; | |
239 | } | |
240 | ||
241 | static long pem_get_input(u8 *data, int len, int index) | |
242 | { | |
243 | long val; | |
244 | ||
245 | switch (index) { | |
246 | case PEM_INPUT_VOLTAGE: | |
247 | if (len == INPUT_STRING_LEN) | |
248 | val = (data[index] + (data[index+1] << 8) - 75) * 1000; | |
249 | else | |
250 | val = (data[index] - 75) * 1000; | |
251 | break; | |
252 | case PEM_INPUT_POWER_LSB: | |
253 | if (len == INPUT_STRING_LEN) | |
254 | index++; | |
255 | val = (data[index] + (data[index+1] << 8)) * 1000000L; | |
256 | break; | |
257 | default: | |
258 | WARN_ON_ONCE(1); | |
259 | val = 0; | |
260 | } | |
261 | return val; | |
262 | } | |
263 | ||
264 | static long pem_get_fan(u8 *data, int len, int index) | |
265 | { | |
266 | long val; | |
267 | ||
268 | switch (index) { | |
269 | case PEM_FAN_FAN1: | |
270 | case PEM_FAN_FAN2: | |
271 | case PEM_FAN_FAN3: | |
272 | val = data[index] * 100; | |
273 | break; | |
274 | default: | |
275 | WARN_ON_ONCE(1); | |
276 | val = 0; | |
277 | } | |
278 | return val; | |
279 | } | |
280 | ||
281 | /* | |
282 | * Show boolean, either a fault or an alarm. | |
283 | * .nr points to the register, .index is the bit mask to check | |
284 | */ | |
285 | static ssize_t pem_show_bool(struct device *dev, | |
286 | struct device_attribute *da, char *buf) | |
287 | { | |
288 | struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(da); | |
289 | struct pem_data *data = pem_update_device(dev); | |
290 | u8 status; | |
291 | ||
292 | if (IS_ERR(data)) | |
293 | return PTR_ERR(data); | |
294 | ||
295 | status = data->data_string[attr->nr] & attr->index; | |
296 | return snprintf(buf, PAGE_SIZE, "%d\n", !!status); | |
297 | } | |
298 | ||
299 | static ssize_t pem_show_data(struct device *dev, struct device_attribute *da, | |
300 | char *buf) | |
301 | { | |
302 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); | |
303 | struct pem_data *data = pem_update_device(dev); | |
304 | long value; | |
305 | ||
306 | if (IS_ERR(data)) | |
307 | return PTR_ERR(data); | |
308 | ||
309 | value = pem_get_data(data->data_string, sizeof(data->data_string), | |
310 | attr->index); | |
311 | ||
312 | return snprintf(buf, PAGE_SIZE, "%ld\n", value); | |
313 | } | |
314 | ||
315 | static ssize_t pem_show_input(struct device *dev, struct device_attribute *da, | |
316 | char *buf) | |
317 | { | |
318 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); | |
319 | struct pem_data *data = pem_update_device(dev); | |
320 | long value; | |
321 | ||
322 | if (IS_ERR(data)) | |
323 | return PTR_ERR(data); | |
324 | ||
325 | value = pem_get_input(data->input_string, sizeof(data->input_string), | |
326 | attr->index); | |
327 | ||
328 | return snprintf(buf, PAGE_SIZE, "%ld\n", value); | |
329 | } | |
330 | ||
331 | static ssize_t pem_show_fan(struct device *dev, struct device_attribute *da, | |
332 | char *buf) | |
333 | { | |
334 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); | |
335 | struct pem_data *data = pem_update_device(dev); | |
336 | long value; | |
337 | ||
338 | if (IS_ERR(data)) | |
339 | return PTR_ERR(data); | |
340 | ||
341 | value = pem_get_fan(data->fan_speed, sizeof(data->fan_speed), | |
342 | attr->index); | |
343 | ||
344 | return snprintf(buf, PAGE_SIZE, "%ld\n", value); | |
345 | } | |
346 | ||
347 | /* Voltages */ | |
348 | static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, pem_show_data, NULL, | |
349 | PEM_DATA_VOUT_LSB); | |
d668a8b0 | 350 | static SENSOR_DEVICE_ATTR_2(in1_alarm, S_IRUGO, pem_show_bool, NULL, |
502b5a01 GR |
351 | PEM_DATA_ALARM_1, ALRM1_VOUT_OUT_LIMIT); |
352 | static SENSOR_DEVICE_ATTR_2(in1_crit_alarm, S_IRUGO, pem_show_bool, NULL, | |
353 | PEM_DATA_ALARM_1, ALRM1_OV_VOLT_SHUTDOWN); | |
354 | static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, pem_show_input, NULL, | |
355 | PEM_INPUT_VOLTAGE); | |
356 | static SENSOR_DEVICE_ATTR_2(in2_alarm, S_IRUGO, pem_show_bool, NULL, | |
357 | PEM_DATA_ALARM_1, | |
358 | ALRM1_VIN_OUT_LIMIT | ALRM1_PRIMARY_FAULT); | |
359 | ||
360 | /* Currents */ | |
361 | static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, pem_show_data, NULL, | |
362 | PEM_DATA_CURRENT); | |
363 | static SENSOR_DEVICE_ATTR_2(curr1_alarm, S_IRUGO, pem_show_bool, NULL, | |
364 | PEM_DATA_ALARM_1, ALRM1_VIN_OVERCURRENT); | |
365 | ||
366 | /* Power */ | |
367 | static SENSOR_DEVICE_ATTR(power1_input, S_IRUGO, pem_show_input, NULL, | |
368 | PEM_INPUT_POWER_LSB); | |
369 | static SENSOR_DEVICE_ATTR_2(power1_alarm, S_IRUGO, pem_show_bool, NULL, | |
370 | PEM_DATA_ALARM_1, ALRM1_POWER_LIMIT); | |
371 | ||
372 | /* Fans */ | |
373 | static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, pem_show_fan, NULL, | |
374 | PEM_FAN_FAN1); | |
375 | static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, pem_show_fan, NULL, | |
376 | PEM_FAN_FAN2); | |
377 | static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, pem_show_fan, NULL, | |
378 | PEM_FAN_FAN3); | |
379 | static SENSOR_DEVICE_ATTR_2(fan1_alarm, S_IRUGO, pem_show_bool, NULL, | |
380 | PEM_DATA_ALARM_2, ALRM2_FAN_FAULT); | |
381 | ||
382 | /* Temperatures */ | |
383 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, pem_show_data, NULL, | |
384 | PEM_DATA_TEMP); | |
385 | static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, pem_show_data, NULL, | |
386 | PEM_DATA_TEMP_MAX); | |
387 | static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, pem_show_data, NULL, | |
388 | PEM_DATA_TEMP_CRIT); | |
389 | static SENSOR_DEVICE_ATTR_2(temp1_alarm, S_IRUGO, pem_show_bool, NULL, | |
390 | PEM_DATA_ALARM_1, ALRM1_TEMP_WARNING); | |
391 | static SENSOR_DEVICE_ATTR_2(temp1_crit_alarm, S_IRUGO, pem_show_bool, NULL, | |
392 | PEM_DATA_ALARM_1, ALRM1_TEMP_SHUTDOWN); | |
393 | static SENSOR_DEVICE_ATTR_2(temp1_fault, S_IRUGO, pem_show_bool, NULL, | |
394 | PEM_DATA_ALARM_2, ALRM2_TEMP_FAULT); | |
395 | ||
396 | static struct attribute *pem_attributes[] = { | |
397 | &sensor_dev_attr_in1_input.dev_attr.attr, | |
d668a8b0 | 398 | &sensor_dev_attr_in1_alarm.dev_attr.attr, |
502b5a01 GR |
399 | &sensor_dev_attr_in1_crit_alarm.dev_attr.attr, |
400 | &sensor_dev_attr_in2_alarm.dev_attr.attr, | |
401 | ||
402 | &sensor_dev_attr_curr1_alarm.dev_attr.attr, | |
403 | ||
404 | &sensor_dev_attr_power1_alarm.dev_attr.attr, | |
405 | ||
406 | &sensor_dev_attr_fan1_alarm.dev_attr.attr, | |
407 | ||
408 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
409 | &sensor_dev_attr_temp1_max.dev_attr.attr, | |
410 | &sensor_dev_attr_temp1_crit.dev_attr.attr, | |
411 | &sensor_dev_attr_temp1_alarm.dev_attr.attr, | |
412 | &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr, | |
413 | &sensor_dev_attr_temp1_fault.dev_attr.attr, | |
414 | ||
415 | NULL, | |
416 | }; | |
417 | ||
418 | static const struct attribute_group pem_group = { | |
419 | .attrs = pem_attributes, | |
420 | }; | |
421 | ||
422 | static struct attribute *pem_input_attributes[] = { | |
423 | &sensor_dev_attr_in2_input.dev_attr.attr, | |
424 | &sensor_dev_attr_curr1_input.dev_attr.attr, | |
425 | &sensor_dev_attr_power1_input.dev_attr.attr, | |
df069079 | 426 | NULL |
502b5a01 GR |
427 | }; |
428 | ||
429 | static const struct attribute_group pem_input_group = { | |
430 | .attrs = pem_input_attributes, | |
431 | }; | |
432 | ||
433 | static struct attribute *pem_fan_attributes[] = { | |
434 | &sensor_dev_attr_fan1_input.dev_attr.attr, | |
435 | &sensor_dev_attr_fan2_input.dev_attr.attr, | |
436 | &sensor_dev_attr_fan3_input.dev_attr.attr, | |
df069079 | 437 | NULL |
502b5a01 GR |
438 | }; |
439 | ||
440 | static const struct attribute_group pem_fan_group = { | |
441 | .attrs = pem_fan_attributes, | |
442 | }; | |
443 | ||
444 | static int pem_probe(struct i2c_client *client, | |
445 | const struct i2c_device_id *id) | |
446 | { | |
447 | struct i2c_adapter *adapter = client->adapter; | |
82803252 AL |
448 | struct device *dev = &client->dev; |
449 | struct device *hwmon_dev; | |
502b5a01 | 450 | struct pem_data *data; |
82803252 | 451 | int ret, idx = 0; |
502b5a01 GR |
452 | |
453 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BLOCK_DATA | |
454 | | I2C_FUNC_SMBUS_WRITE_BYTE)) | |
455 | return -ENODEV; | |
456 | ||
82803252 | 457 | data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); |
502b5a01 GR |
458 | if (!data) |
459 | return -ENOMEM; | |
460 | ||
82803252 | 461 | data->client = client; |
502b5a01 GR |
462 | mutex_init(&data->update_lock); |
463 | ||
464 | /* | |
465 | * We use the next two commands to determine if the device is really | |
466 | * there. | |
467 | */ | |
468 | ret = pem_read_block(client, PEM_READ_FIRMWARE_REV, | |
469 | data->firmware_rev, sizeof(data->firmware_rev)); | |
470 | if (ret < 0) | |
07404aab | 471 | return ret; |
502b5a01 GR |
472 | |
473 | ret = i2c_smbus_write_byte(client, PEM_CLEAR_INFO_FLAGS); | |
474 | if (ret < 0) | |
07404aab | 475 | return ret; |
502b5a01 | 476 | |
82803252 | 477 | dev_info(dev, "Firmware revision %d.%d.%d\n", |
502b5a01 GR |
478 | data->firmware_rev[0], data->firmware_rev[1], |
479 | data->firmware_rev[2]); | |
480 | ||
82803252 AL |
481 | /* sysfs hooks */ |
482 | data->groups[idx++] = &pem_group; | |
502b5a01 GR |
483 | |
484 | /* | |
485 | * Check if input readings are supported. | |
486 | * This is the case if we can read input data, | |
487 | * and if the returned data is not all zeros. | |
488 | * Note that input alarms are always supported. | |
489 | */ | |
490 | ret = pem_read_block(client, PEM_READ_INPUT_STRING, | |
491 | data->input_string, | |
492 | sizeof(data->input_string) - 1); | |
493 | if (!ret && (data->input_string[0] || data->input_string[1] || | |
494 | data->input_string[2])) | |
495 | data->input_length = sizeof(data->input_string) - 1; | |
496 | else if (ret < 0) { | |
497 | /* Input string is one byte longer for some devices */ | |
498 | ret = pem_read_block(client, PEM_READ_INPUT_STRING, | |
499 | data->input_string, | |
500 | sizeof(data->input_string)); | |
501 | if (!ret && (data->input_string[0] || data->input_string[1] || | |
502 | data->input_string[2] || data->input_string[3])) | |
503 | data->input_length = sizeof(data->input_string); | |
504 | } | |
82803252 AL |
505 | |
506 | if (data->input_length) | |
507 | data->groups[idx++] = &pem_input_group; | |
502b5a01 GR |
508 | |
509 | /* | |
510 | * Check if fan speed readings are supported. | |
511 | * This is the case if we can read fan speed data, | |
512 | * and if the returned data is not all zeros. | |
513 | * Note that the fan alarm is always supported. | |
514 | */ | |
515 | ret = pem_read_block(client, PEM_READ_FAN_SPEED, | |
516 | data->fan_speed, | |
517 | sizeof(data->fan_speed)); | |
518 | if (!ret && (data->fan_speed[0] || data->fan_speed[1] || | |
519 | data->fan_speed[2] || data->fan_speed[3])) { | |
520 | data->fans_supported = true; | |
82803252 | 521 | data->groups[idx++] = &pem_fan_group; |
502b5a01 GR |
522 | } |
523 | ||
82803252 AL |
524 | hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, |
525 | data, data->groups); | |
526 | return PTR_ERR_OR_ZERO(hwmon_dev); | |
502b5a01 GR |
527 | } |
528 | ||
529 | static const struct i2c_device_id pem_id[] = { | |
530 | {"lineage_pem", 0}, | |
531 | {} | |
532 | }; | |
533 | MODULE_DEVICE_TABLE(i2c, pem_id); | |
534 | ||
535 | static struct i2c_driver pem_driver = { | |
536 | .driver = { | |
537 | .name = "lineage_pem", | |
538 | }, | |
539 | .probe = pem_probe, | |
502b5a01 GR |
540 | .id_table = pem_id, |
541 | }; | |
542 | ||
f0967eea | 543 | module_i2c_driver(pem_driver); |
502b5a01 | 544 | |
bb9a80e5 | 545 | MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>"); |
502b5a01 GR |
546 | MODULE_DESCRIPTION("Lineage CPL PEM hardware monitoring driver"); |
547 | MODULE_LICENSE("GPL"); |