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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> | |
32 | ||
33 | /* | |
34 | * This driver supports various Lineage Compact Power Line DC/DC and AC/DC | |
35 | * converters such as CP1800, CP2000AC, CP2000DC, CP2100DC, and others. | |
36 | * | |
37 | * The devices are nominally PMBus compliant. However, most standard PMBus | |
38 | * commands are not supported. Specifically, all hardware monitoring and | |
39 | * status reporting commands are non-standard. For this reason, a standard | |
40 | * PMBus driver can not be used. | |
41 | * | |
42 | * All Lineage CPL devices have a built-in I2C bus master selector (PCA9541). | |
43 | * To ensure device access, this driver should only be used as client driver | |
44 | * to the pca9541 I2C master selector driver. | |
45 | */ | |
46 | ||
47 | /* Command codes */ | |
48 | #define PEM_OPERATION 0x01 | |
49 | #define PEM_CLEAR_INFO_FLAGS 0x03 | |
50 | #define PEM_VOUT_COMMAND 0x21 | |
51 | #define PEM_VOUT_OV_FAULT_LIMIT 0x40 | |
52 | #define PEM_READ_DATA_STRING 0xd0 | |
53 | #define PEM_READ_INPUT_STRING 0xdc | |
54 | #define PEM_READ_FIRMWARE_REV 0xdd | |
55 | #define PEM_READ_RUN_TIMER 0xde | |
56 | #define PEM_FAN_HI_SPEED 0xdf | |
57 | #define PEM_FAN_NORMAL_SPEED 0xe0 | |
58 | #define PEM_READ_FAN_SPEED 0xe1 | |
59 | ||
60 | /* offsets in data string */ | |
61 | #define PEM_DATA_STATUS_2 0 | |
62 | #define PEM_DATA_STATUS_1 1 | |
63 | #define PEM_DATA_ALARM_2 2 | |
64 | #define PEM_DATA_ALARM_1 3 | |
65 | #define PEM_DATA_VOUT_LSB 4 | |
66 | #define PEM_DATA_VOUT_MSB 5 | |
67 | #define PEM_DATA_CURRENT 6 | |
68 | #define PEM_DATA_TEMP 7 | |
69 | ||
70 | /* Virtual entries, to report constants */ | |
71 | #define PEM_DATA_TEMP_MAX 10 | |
72 | #define PEM_DATA_TEMP_CRIT 11 | |
73 | ||
74 | /* offsets in input string */ | |
75 | #define PEM_INPUT_VOLTAGE 0 | |
76 | #define PEM_INPUT_POWER_LSB 1 | |
77 | #define PEM_INPUT_POWER_MSB 2 | |
78 | ||
79 | /* offsets in fan data */ | |
80 | #define PEM_FAN_ADJUSTMENT 0 | |
81 | #define PEM_FAN_FAN1 1 | |
82 | #define PEM_FAN_FAN2 2 | |
83 | #define PEM_FAN_FAN3 3 | |
84 | ||
85 | /* Status register bits */ | |
86 | #define STS1_OUTPUT_ON (1 << 0) | |
87 | #define STS1_LEDS_FLASHING (1 << 1) | |
88 | #define STS1_EXT_FAULT (1 << 2) | |
89 | #define STS1_SERVICE_LED_ON (1 << 3) | |
90 | #define STS1_SHUTDOWN_OCCURRED (1 << 4) | |
91 | #define STS1_INT_FAULT (1 << 5) | |
92 | #define STS1_ISOLATION_TEST_OK (1 << 6) | |
93 | ||
94 | #define STS2_ENABLE_PIN_HI (1 << 0) | |
95 | #define STS2_DATA_OUT_RANGE (1 << 1) | |
96 | #define STS2_RESTARTED_OK (1 << 1) | |
97 | #define STS2_ISOLATION_TEST_FAIL (1 << 3) | |
98 | #define STS2_HIGH_POWER_CAP (1 << 4) | |
99 | #define STS2_INVALID_INSTR (1 << 5) | |
100 | #define STS2_WILL_RESTART (1 << 6) | |
101 | #define STS2_PEC_ERR (1 << 7) | |
102 | ||
103 | /* Alarm register bits */ | |
104 | #define ALRM1_VIN_OUT_LIMIT (1 << 0) | |
105 | #define ALRM1_VOUT_OUT_LIMIT (1 << 1) | |
106 | #define ALRM1_OV_VOLT_SHUTDOWN (1 << 2) | |
107 | #define ALRM1_VIN_OVERCURRENT (1 << 3) | |
108 | #define ALRM1_TEMP_WARNING (1 << 4) | |
109 | #define ALRM1_TEMP_SHUTDOWN (1 << 5) | |
110 | #define ALRM1_PRIMARY_FAULT (1 << 6) | |
111 | #define ALRM1_POWER_LIMIT (1 << 7) | |
112 | ||
113 | #define ALRM2_5V_OUT_LIMIT (1 << 1) | |
114 | #define ALRM2_TEMP_FAULT (1 << 2) | |
115 | #define ALRM2_OV_LOW (1 << 3) | |
116 | #define ALRM2_DCDC_TEMP_HIGH (1 << 4) | |
117 | #define ALRM2_PRI_TEMP_HIGH (1 << 5) | |
118 | #define ALRM2_NO_PRIMARY (1 << 6) | |
119 | #define ALRM2_FAN_FAULT (1 << 7) | |
120 | ||
121 | #define FIRMWARE_REV_LEN 4 | |
122 | #define DATA_STRING_LEN 9 | |
123 | #define INPUT_STRING_LEN 5 /* 4 for most devices */ | |
124 | #define FAN_SPEED_LEN 5 | |
125 | ||
126 | struct pem_data { | |
127 | struct device *hwmon_dev; | |
128 | ||
129 | struct mutex update_lock; | |
130 | bool valid; | |
131 | bool fans_supported; | |
132 | int input_length; | |
133 | unsigned long last_updated; /* in jiffies */ | |
134 | ||
135 | u8 firmware_rev[FIRMWARE_REV_LEN]; | |
136 | u8 data_string[DATA_STRING_LEN]; | |
137 | u8 input_string[INPUT_STRING_LEN]; | |
138 | u8 fan_speed[FAN_SPEED_LEN]; | |
139 | }; | |
140 | ||
141 | static int pem_read_block(struct i2c_client *client, u8 command, u8 *data, | |
142 | int data_len) | |
143 | { | |
144 | u8 block_buffer[I2C_SMBUS_BLOCK_MAX]; | |
145 | int result; | |
146 | ||
147 | result = i2c_smbus_read_block_data(client, command, block_buffer); | |
148 | if (unlikely(result < 0)) | |
149 | goto abort; | |
150 | if (unlikely(result == 0xff || result != data_len)) { | |
151 | result = -EIO; | |
152 | goto abort; | |
153 | } | |
154 | memcpy(data, block_buffer, data_len); | |
155 | result = 0; | |
156 | abort: | |
157 | return result; | |
158 | } | |
159 | ||
160 | static struct pem_data *pem_update_device(struct device *dev) | |
161 | { | |
162 | struct i2c_client *client = to_i2c_client(dev); | |
163 | struct pem_data *data = i2c_get_clientdata(client); | |
164 | struct pem_data *ret = data; | |
165 | ||
166 | mutex_lock(&data->update_lock); | |
167 | ||
168 | if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { | |
169 | int result; | |
170 | ||
171 | /* Read data string */ | |
172 | result = pem_read_block(client, PEM_READ_DATA_STRING, | |
173 | data->data_string, | |
174 | sizeof(data->data_string)); | |
175 | if (unlikely(result < 0)) { | |
176 | ret = ERR_PTR(result); | |
177 | goto abort; | |
178 | } | |
179 | ||
180 | /* Read input string */ | |
181 | if (data->input_length) { | |
182 | result = pem_read_block(client, PEM_READ_INPUT_STRING, | |
183 | data->input_string, | |
184 | data->input_length); | |
185 | if (unlikely(result < 0)) { | |
186 | ret = ERR_PTR(result); | |
187 | goto abort; | |
188 | } | |
189 | } | |
190 | ||
191 | /* Read fan speeds */ | |
192 | if (data->fans_supported) { | |
193 | result = pem_read_block(client, PEM_READ_FAN_SPEED, | |
194 | data->fan_speed, | |
195 | sizeof(data->fan_speed)); | |
196 | if (unlikely(result < 0)) { | |
197 | ret = ERR_PTR(result); | |
198 | goto abort; | |
199 | } | |
200 | } | |
201 | ||
202 | i2c_smbus_write_byte(client, PEM_CLEAR_INFO_FLAGS); | |
203 | ||
204 | data->last_updated = jiffies; | |
205 | data->valid = 1; | |
206 | } | |
207 | abort: | |
208 | mutex_unlock(&data->update_lock); | |
209 | return ret; | |
210 | } | |
211 | ||
212 | static long pem_get_data(u8 *data, int len, int index) | |
213 | { | |
214 | long val; | |
215 | ||
216 | switch (index) { | |
217 | case PEM_DATA_VOUT_LSB: | |
218 | val = (data[index] + (data[index+1] << 8)) * 5 / 2; | |
219 | break; | |
220 | case PEM_DATA_CURRENT: | |
221 | val = data[index] * 200; | |
222 | break; | |
223 | case PEM_DATA_TEMP: | |
224 | val = data[index] * 1000; | |
225 | break; | |
226 | case PEM_DATA_TEMP_MAX: | |
227 | val = 97 * 1000; /* 97 degrees C per datasheet */ | |
228 | break; | |
229 | case PEM_DATA_TEMP_CRIT: | |
230 | val = 107 * 1000; /* 107 degrees C per datasheet */ | |
231 | break; | |
232 | default: | |
233 | WARN_ON_ONCE(1); | |
234 | val = 0; | |
235 | } | |
236 | return val; | |
237 | } | |
238 | ||
239 | static long pem_get_input(u8 *data, int len, int index) | |
240 | { | |
241 | long val; | |
242 | ||
243 | switch (index) { | |
244 | case PEM_INPUT_VOLTAGE: | |
245 | if (len == INPUT_STRING_LEN) | |
246 | val = (data[index] + (data[index+1] << 8) - 75) * 1000; | |
247 | else | |
248 | val = (data[index] - 75) * 1000; | |
249 | break; | |
250 | case PEM_INPUT_POWER_LSB: | |
251 | if (len == INPUT_STRING_LEN) | |
252 | index++; | |
253 | val = (data[index] + (data[index+1] << 8)) * 1000000L; | |
254 | break; | |
255 | default: | |
256 | WARN_ON_ONCE(1); | |
257 | val = 0; | |
258 | } | |
259 | return val; | |
260 | } | |
261 | ||
262 | static long pem_get_fan(u8 *data, int len, int index) | |
263 | { | |
264 | long val; | |
265 | ||
266 | switch (index) { | |
267 | case PEM_FAN_FAN1: | |
268 | case PEM_FAN_FAN2: | |
269 | case PEM_FAN_FAN3: | |
270 | val = data[index] * 100; | |
271 | break; | |
272 | default: | |
273 | WARN_ON_ONCE(1); | |
274 | val = 0; | |
275 | } | |
276 | return val; | |
277 | } | |
278 | ||
279 | /* | |
280 | * Show boolean, either a fault or an alarm. | |
281 | * .nr points to the register, .index is the bit mask to check | |
282 | */ | |
283 | static ssize_t pem_show_bool(struct device *dev, | |
284 | struct device_attribute *da, char *buf) | |
285 | { | |
286 | struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(da); | |
287 | struct pem_data *data = pem_update_device(dev); | |
288 | u8 status; | |
289 | ||
290 | if (IS_ERR(data)) | |
291 | return PTR_ERR(data); | |
292 | ||
293 | status = data->data_string[attr->nr] & attr->index; | |
294 | return snprintf(buf, PAGE_SIZE, "%d\n", !!status); | |
295 | } | |
296 | ||
297 | static ssize_t pem_show_data(struct device *dev, struct device_attribute *da, | |
298 | char *buf) | |
299 | { | |
300 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); | |
301 | struct pem_data *data = pem_update_device(dev); | |
302 | long value; | |
303 | ||
304 | if (IS_ERR(data)) | |
305 | return PTR_ERR(data); | |
306 | ||
307 | value = pem_get_data(data->data_string, sizeof(data->data_string), | |
308 | attr->index); | |
309 | ||
310 | return snprintf(buf, PAGE_SIZE, "%ld\n", value); | |
311 | } | |
312 | ||
313 | static ssize_t pem_show_input(struct device *dev, struct device_attribute *da, | |
314 | char *buf) | |
315 | { | |
316 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); | |
317 | struct pem_data *data = pem_update_device(dev); | |
318 | long value; | |
319 | ||
320 | if (IS_ERR(data)) | |
321 | return PTR_ERR(data); | |
322 | ||
323 | value = pem_get_input(data->input_string, sizeof(data->input_string), | |
324 | attr->index); | |
325 | ||
326 | return snprintf(buf, PAGE_SIZE, "%ld\n", value); | |
327 | } | |
328 | ||
329 | static ssize_t pem_show_fan(struct device *dev, struct device_attribute *da, | |
330 | char *buf) | |
331 | { | |
332 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); | |
333 | struct pem_data *data = pem_update_device(dev); | |
334 | long value; | |
335 | ||
336 | if (IS_ERR(data)) | |
337 | return PTR_ERR(data); | |
338 | ||
339 | value = pem_get_fan(data->fan_speed, sizeof(data->fan_speed), | |
340 | attr->index); | |
341 | ||
342 | return snprintf(buf, PAGE_SIZE, "%ld\n", value); | |
343 | } | |
344 | ||
345 | /* Voltages */ | |
346 | static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, pem_show_data, NULL, | |
347 | PEM_DATA_VOUT_LSB); | |
d668a8b0 | 348 | static SENSOR_DEVICE_ATTR_2(in1_alarm, S_IRUGO, pem_show_bool, NULL, |
502b5a01 GR |
349 | PEM_DATA_ALARM_1, ALRM1_VOUT_OUT_LIMIT); |
350 | static SENSOR_DEVICE_ATTR_2(in1_crit_alarm, S_IRUGO, pem_show_bool, NULL, | |
351 | PEM_DATA_ALARM_1, ALRM1_OV_VOLT_SHUTDOWN); | |
352 | static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, pem_show_input, NULL, | |
353 | PEM_INPUT_VOLTAGE); | |
354 | static SENSOR_DEVICE_ATTR_2(in2_alarm, S_IRUGO, pem_show_bool, NULL, | |
355 | PEM_DATA_ALARM_1, | |
356 | ALRM1_VIN_OUT_LIMIT | ALRM1_PRIMARY_FAULT); | |
357 | ||
358 | /* Currents */ | |
359 | static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, pem_show_data, NULL, | |
360 | PEM_DATA_CURRENT); | |
361 | static SENSOR_DEVICE_ATTR_2(curr1_alarm, S_IRUGO, pem_show_bool, NULL, | |
362 | PEM_DATA_ALARM_1, ALRM1_VIN_OVERCURRENT); | |
363 | ||
364 | /* Power */ | |
365 | static SENSOR_DEVICE_ATTR(power1_input, S_IRUGO, pem_show_input, NULL, | |
366 | PEM_INPUT_POWER_LSB); | |
367 | static SENSOR_DEVICE_ATTR_2(power1_alarm, S_IRUGO, pem_show_bool, NULL, | |
368 | PEM_DATA_ALARM_1, ALRM1_POWER_LIMIT); | |
369 | ||
370 | /* Fans */ | |
371 | static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, pem_show_fan, NULL, | |
372 | PEM_FAN_FAN1); | |
373 | static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, pem_show_fan, NULL, | |
374 | PEM_FAN_FAN2); | |
375 | static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, pem_show_fan, NULL, | |
376 | PEM_FAN_FAN3); | |
377 | static SENSOR_DEVICE_ATTR_2(fan1_alarm, S_IRUGO, pem_show_bool, NULL, | |
378 | PEM_DATA_ALARM_2, ALRM2_FAN_FAULT); | |
379 | ||
380 | /* Temperatures */ | |
381 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, pem_show_data, NULL, | |
382 | PEM_DATA_TEMP); | |
383 | static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, pem_show_data, NULL, | |
384 | PEM_DATA_TEMP_MAX); | |
385 | static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, pem_show_data, NULL, | |
386 | PEM_DATA_TEMP_CRIT); | |
387 | static SENSOR_DEVICE_ATTR_2(temp1_alarm, S_IRUGO, pem_show_bool, NULL, | |
388 | PEM_DATA_ALARM_1, ALRM1_TEMP_WARNING); | |
389 | static SENSOR_DEVICE_ATTR_2(temp1_crit_alarm, S_IRUGO, pem_show_bool, NULL, | |
390 | PEM_DATA_ALARM_1, ALRM1_TEMP_SHUTDOWN); | |
391 | static SENSOR_DEVICE_ATTR_2(temp1_fault, S_IRUGO, pem_show_bool, NULL, | |
392 | PEM_DATA_ALARM_2, ALRM2_TEMP_FAULT); | |
393 | ||
394 | static struct attribute *pem_attributes[] = { | |
395 | &sensor_dev_attr_in1_input.dev_attr.attr, | |
d668a8b0 | 396 | &sensor_dev_attr_in1_alarm.dev_attr.attr, |
502b5a01 GR |
397 | &sensor_dev_attr_in1_crit_alarm.dev_attr.attr, |
398 | &sensor_dev_attr_in2_alarm.dev_attr.attr, | |
399 | ||
400 | &sensor_dev_attr_curr1_alarm.dev_attr.attr, | |
401 | ||
402 | &sensor_dev_attr_power1_alarm.dev_attr.attr, | |
403 | ||
404 | &sensor_dev_attr_fan1_alarm.dev_attr.attr, | |
405 | ||
406 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
407 | &sensor_dev_attr_temp1_max.dev_attr.attr, | |
408 | &sensor_dev_attr_temp1_crit.dev_attr.attr, | |
409 | &sensor_dev_attr_temp1_alarm.dev_attr.attr, | |
410 | &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr, | |
411 | &sensor_dev_attr_temp1_fault.dev_attr.attr, | |
412 | ||
413 | NULL, | |
414 | }; | |
415 | ||
416 | static const struct attribute_group pem_group = { | |
417 | .attrs = pem_attributes, | |
418 | }; | |
419 | ||
420 | static struct attribute *pem_input_attributes[] = { | |
421 | &sensor_dev_attr_in2_input.dev_attr.attr, | |
422 | &sensor_dev_attr_curr1_input.dev_attr.attr, | |
423 | &sensor_dev_attr_power1_input.dev_attr.attr, | |
424 | }; | |
425 | ||
426 | static const struct attribute_group pem_input_group = { | |
427 | .attrs = pem_input_attributes, | |
428 | }; | |
429 | ||
430 | static struct attribute *pem_fan_attributes[] = { | |
431 | &sensor_dev_attr_fan1_input.dev_attr.attr, | |
432 | &sensor_dev_attr_fan2_input.dev_attr.attr, | |
433 | &sensor_dev_attr_fan3_input.dev_attr.attr, | |
434 | }; | |
435 | ||
436 | static const struct attribute_group pem_fan_group = { | |
437 | .attrs = pem_fan_attributes, | |
438 | }; | |
439 | ||
440 | static int pem_probe(struct i2c_client *client, | |
441 | const struct i2c_device_id *id) | |
442 | { | |
443 | struct i2c_adapter *adapter = client->adapter; | |
444 | struct pem_data *data; | |
445 | int ret; | |
446 | ||
447 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BLOCK_DATA | |
448 | | I2C_FUNC_SMBUS_WRITE_BYTE)) | |
449 | return -ENODEV; | |
450 | ||
451 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
452 | if (!data) | |
453 | return -ENOMEM; | |
454 | ||
455 | i2c_set_clientdata(client, data); | |
456 | mutex_init(&data->update_lock); | |
457 | ||
458 | /* | |
459 | * We use the next two commands to determine if the device is really | |
460 | * there. | |
461 | */ | |
462 | ret = pem_read_block(client, PEM_READ_FIRMWARE_REV, | |
463 | data->firmware_rev, sizeof(data->firmware_rev)); | |
464 | if (ret < 0) | |
465 | goto out_kfree; | |
466 | ||
467 | ret = i2c_smbus_write_byte(client, PEM_CLEAR_INFO_FLAGS); | |
468 | if (ret < 0) | |
469 | goto out_kfree; | |
470 | ||
471 | dev_info(&client->dev, "Firmware revision %d.%d.%d\n", | |
472 | data->firmware_rev[0], data->firmware_rev[1], | |
473 | data->firmware_rev[2]); | |
474 | ||
475 | /* Register sysfs hooks */ | |
476 | ret = sysfs_create_group(&client->dev.kobj, &pem_group); | |
477 | if (ret) | |
478 | goto out_kfree; | |
479 | ||
480 | /* | |
481 | * Check if input readings are supported. | |
482 | * This is the case if we can read input data, | |
483 | * and if the returned data is not all zeros. | |
484 | * Note that input alarms are always supported. | |
485 | */ | |
486 | ret = pem_read_block(client, PEM_READ_INPUT_STRING, | |
487 | data->input_string, | |
488 | sizeof(data->input_string) - 1); | |
489 | if (!ret && (data->input_string[0] || data->input_string[1] || | |
490 | data->input_string[2])) | |
491 | data->input_length = sizeof(data->input_string) - 1; | |
492 | else if (ret < 0) { | |
493 | /* Input string is one byte longer for some devices */ | |
494 | ret = pem_read_block(client, PEM_READ_INPUT_STRING, | |
495 | data->input_string, | |
496 | sizeof(data->input_string)); | |
497 | if (!ret && (data->input_string[0] || data->input_string[1] || | |
498 | data->input_string[2] || data->input_string[3])) | |
499 | data->input_length = sizeof(data->input_string); | |
500 | } | |
501 | ret = 0; | |
502 | if (data->input_length) { | |
503 | ret = sysfs_create_group(&client->dev.kobj, &pem_input_group); | |
504 | if (ret) | |
505 | goto out_remove_groups; | |
506 | } | |
507 | ||
508 | /* | |
509 | * Check if fan speed readings are supported. | |
510 | * This is the case if we can read fan speed data, | |
511 | * and if the returned data is not all zeros. | |
512 | * Note that the fan alarm is always supported. | |
513 | */ | |
514 | ret = pem_read_block(client, PEM_READ_FAN_SPEED, | |
515 | data->fan_speed, | |
516 | sizeof(data->fan_speed)); | |
517 | if (!ret && (data->fan_speed[0] || data->fan_speed[1] || | |
518 | data->fan_speed[2] || data->fan_speed[3])) { | |
519 | data->fans_supported = true; | |
520 | ret = sysfs_create_group(&client->dev.kobj, &pem_fan_group); | |
521 | if (ret) | |
522 | goto out_remove_groups; | |
523 | } | |
524 | ||
525 | data->hwmon_dev = hwmon_device_register(&client->dev); | |
526 | if (IS_ERR(data->hwmon_dev)) { | |
527 | ret = PTR_ERR(data->hwmon_dev); | |
528 | goto out_remove_groups; | |
529 | } | |
530 | ||
531 | return 0; | |
532 | ||
533 | out_remove_groups: | |
534 | sysfs_remove_group(&client->dev.kobj, &pem_input_group); | |
535 | sysfs_remove_group(&client->dev.kobj, &pem_fan_group); | |
536 | sysfs_remove_group(&client->dev.kobj, &pem_group); | |
537 | out_kfree: | |
538 | kfree(data); | |
539 | return ret; | |
540 | } | |
541 | ||
542 | static int pem_remove(struct i2c_client *client) | |
543 | { | |
544 | struct pem_data *data = i2c_get_clientdata(client); | |
545 | ||
546 | hwmon_device_unregister(data->hwmon_dev); | |
547 | ||
548 | sysfs_remove_group(&client->dev.kobj, &pem_input_group); | |
549 | sysfs_remove_group(&client->dev.kobj, &pem_fan_group); | |
550 | sysfs_remove_group(&client->dev.kobj, &pem_group); | |
551 | ||
552 | kfree(data); | |
553 | return 0; | |
554 | } | |
555 | ||
556 | static const struct i2c_device_id pem_id[] = { | |
557 | {"lineage_pem", 0}, | |
558 | {} | |
559 | }; | |
560 | MODULE_DEVICE_TABLE(i2c, pem_id); | |
561 | ||
562 | static struct i2c_driver pem_driver = { | |
563 | .driver = { | |
564 | .name = "lineage_pem", | |
565 | }, | |
566 | .probe = pem_probe, | |
567 | .remove = pem_remove, | |
568 | .id_table = pem_id, | |
569 | }; | |
570 | ||
571 | static int __init pem_init(void) | |
572 | { | |
573 | return i2c_add_driver(&pem_driver); | |
574 | } | |
575 | ||
576 | static void __exit pem_exit(void) | |
577 | { | |
578 | i2c_del_driver(&pem_driver); | |
579 | } | |
580 | ||
581 | MODULE_AUTHOR("Guenter Roeck <guenter.roeck@ericsson.com>"); | |
582 | MODULE_DESCRIPTION("Lineage CPL PEM hardware monitoring driver"); | |
583 | MODULE_LICENSE("GPL"); | |
584 | ||
585 | module_init(pem_init); | |
586 | module_exit(pem_exit); |