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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 { | |
128 | struct device *hwmon_dev; | |
129 | ||
130 | struct mutex update_lock; | |
131 | bool valid; | |
132 | bool fans_supported; | |
133 | int input_length; | |
134 | unsigned long last_updated; /* in jiffies */ | |
135 | ||
136 | u8 firmware_rev[FIRMWARE_REV_LEN]; | |
137 | u8 data_string[DATA_STRING_LEN]; | |
138 | u8 input_string[INPUT_STRING_LEN]; | |
139 | u8 fan_speed[FAN_SPEED_LEN]; | |
140 | }; | |
141 | ||
142 | static int pem_read_block(struct i2c_client *client, u8 command, u8 *data, | |
143 | int data_len) | |
144 | { | |
145 | u8 block_buffer[I2C_SMBUS_BLOCK_MAX]; | |
146 | int result; | |
147 | ||
148 | result = i2c_smbus_read_block_data(client, command, block_buffer); | |
149 | if (unlikely(result < 0)) | |
150 | goto abort; | |
151 | if (unlikely(result == 0xff || result != data_len)) { | |
152 | result = -EIO; | |
153 | goto abort; | |
154 | } | |
155 | memcpy(data, block_buffer, data_len); | |
156 | result = 0; | |
157 | abort: | |
158 | return result; | |
159 | } | |
160 | ||
161 | static struct pem_data *pem_update_device(struct device *dev) | |
162 | { | |
163 | struct i2c_client *client = to_i2c_client(dev); | |
164 | struct pem_data *data = i2c_get_clientdata(client); | |
165 | struct pem_data *ret = data; | |
166 | ||
167 | mutex_lock(&data->update_lock); | |
168 | ||
169 | if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { | |
170 | int result; | |
171 | ||
172 | /* Read data string */ | |
173 | result = pem_read_block(client, PEM_READ_DATA_STRING, | |
174 | data->data_string, | |
175 | sizeof(data->data_string)); | |
176 | if (unlikely(result < 0)) { | |
177 | ret = ERR_PTR(result); | |
178 | goto abort; | |
179 | } | |
180 | ||
181 | /* Read input string */ | |
182 | if (data->input_length) { | |
183 | result = pem_read_block(client, PEM_READ_INPUT_STRING, | |
184 | data->input_string, | |
185 | data->input_length); | |
186 | if (unlikely(result < 0)) { | |
187 | ret = ERR_PTR(result); | |
188 | goto abort; | |
189 | } | |
190 | } | |
191 | ||
192 | /* Read fan speeds */ | |
193 | if (data->fans_supported) { | |
194 | result = pem_read_block(client, PEM_READ_FAN_SPEED, | |
195 | data->fan_speed, | |
196 | sizeof(data->fan_speed)); | |
197 | if (unlikely(result < 0)) { | |
198 | ret = ERR_PTR(result); | |
199 | goto abort; | |
200 | } | |
201 | } | |
202 | ||
203 | i2c_smbus_write_byte(client, PEM_CLEAR_INFO_FLAGS); | |
204 | ||
205 | data->last_updated = jiffies; | |
206 | data->valid = 1; | |
207 | } | |
208 | abort: | |
209 | mutex_unlock(&data->update_lock); | |
210 | return ret; | |
211 | } | |
212 | ||
213 | static long pem_get_data(u8 *data, int len, int index) | |
214 | { | |
215 | long val; | |
216 | ||
217 | switch (index) { | |
218 | case PEM_DATA_VOUT_LSB: | |
219 | val = (data[index] + (data[index+1] << 8)) * 5 / 2; | |
220 | break; | |
221 | case PEM_DATA_CURRENT: | |
222 | val = data[index] * 200; | |
223 | break; | |
224 | case PEM_DATA_TEMP: | |
225 | val = data[index] * 1000; | |
226 | break; | |
227 | case PEM_DATA_TEMP_MAX: | |
228 | val = 97 * 1000; /* 97 degrees C per datasheet */ | |
229 | break; | |
230 | case PEM_DATA_TEMP_CRIT: | |
231 | val = 107 * 1000; /* 107 degrees C per datasheet */ | |
232 | break; | |
233 | default: | |
234 | WARN_ON_ONCE(1); | |
235 | val = 0; | |
236 | } | |
237 | return val; | |
238 | } | |
239 | ||
240 | static long pem_get_input(u8 *data, int len, int index) | |
241 | { | |
242 | long val; | |
243 | ||
244 | switch (index) { | |
245 | case PEM_INPUT_VOLTAGE: | |
246 | if (len == INPUT_STRING_LEN) | |
247 | val = (data[index] + (data[index+1] << 8) - 75) * 1000; | |
248 | else | |
249 | val = (data[index] - 75) * 1000; | |
250 | break; | |
251 | case PEM_INPUT_POWER_LSB: | |
252 | if (len == INPUT_STRING_LEN) | |
253 | index++; | |
254 | val = (data[index] + (data[index+1] << 8)) * 1000000L; | |
255 | break; | |
256 | default: | |
257 | WARN_ON_ONCE(1); | |
258 | val = 0; | |
259 | } | |
260 | return val; | |
261 | } | |
262 | ||
263 | static long pem_get_fan(u8 *data, int len, int index) | |
264 | { | |
265 | long val; | |
266 | ||
267 | switch (index) { | |
268 | case PEM_FAN_FAN1: | |
269 | case PEM_FAN_FAN2: | |
270 | case PEM_FAN_FAN3: | |
271 | val = data[index] * 100; | |
272 | break; | |
273 | default: | |
274 | WARN_ON_ONCE(1); | |
275 | val = 0; | |
276 | } | |
277 | return val; | |
278 | } | |
279 | ||
280 | /* | |
281 | * Show boolean, either a fault or an alarm. | |
282 | * .nr points to the register, .index is the bit mask to check | |
283 | */ | |
284 | static ssize_t pem_show_bool(struct device *dev, | |
285 | struct device_attribute *da, char *buf) | |
286 | { | |
287 | struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(da); | |
288 | struct pem_data *data = pem_update_device(dev); | |
289 | u8 status; | |
290 | ||
291 | if (IS_ERR(data)) | |
292 | return PTR_ERR(data); | |
293 | ||
294 | status = data->data_string[attr->nr] & attr->index; | |
295 | return snprintf(buf, PAGE_SIZE, "%d\n", !!status); | |
296 | } | |
297 | ||
298 | static ssize_t pem_show_data(struct device *dev, struct device_attribute *da, | |
299 | char *buf) | |
300 | { | |
301 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); | |
302 | struct pem_data *data = pem_update_device(dev); | |
303 | long value; | |
304 | ||
305 | if (IS_ERR(data)) | |
306 | return PTR_ERR(data); | |
307 | ||
308 | value = pem_get_data(data->data_string, sizeof(data->data_string), | |
309 | attr->index); | |
310 | ||
311 | return snprintf(buf, PAGE_SIZE, "%ld\n", value); | |
312 | } | |
313 | ||
314 | static ssize_t pem_show_input(struct device *dev, struct device_attribute *da, | |
315 | char *buf) | |
316 | { | |
317 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); | |
318 | struct pem_data *data = pem_update_device(dev); | |
319 | long value; | |
320 | ||
321 | if (IS_ERR(data)) | |
322 | return PTR_ERR(data); | |
323 | ||
324 | value = pem_get_input(data->input_string, sizeof(data->input_string), | |
325 | attr->index); | |
326 | ||
327 | return snprintf(buf, PAGE_SIZE, "%ld\n", value); | |
328 | } | |
329 | ||
330 | static ssize_t pem_show_fan(struct device *dev, struct device_attribute *da, | |
331 | char *buf) | |
332 | { | |
333 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); | |
334 | struct pem_data *data = pem_update_device(dev); | |
335 | long value; | |
336 | ||
337 | if (IS_ERR(data)) | |
338 | return PTR_ERR(data); | |
339 | ||
340 | value = pem_get_fan(data->fan_speed, sizeof(data->fan_speed), | |
341 | attr->index); | |
342 | ||
343 | return snprintf(buf, PAGE_SIZE, "%ld\n", value); | |
344 | } | |
345 | ||
346 | /* Voltages */ | |
347 | static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, pem_show_data, NULL, | |
348 | PEM_DATA_VOUT_LSB); | |
d668a8b0 | 349 | static SENSOR_DEVICE_ATTR_2(in1_alarm, S_IRUGO, pem_show_bool, NULL, |
502b5a01 GR |
350 | PEM_DATA_ALARM_1, ALRM1_VOUT_OUT_LIMIT); |
351 | static SENSOR_DEVICE_ATTR_2(in1_crit_alarm, S_IRUGO, pem_show_bool, NULL, | |
352 | PEM_DATA_ALARM_1, ALRM1_OV_VOLT_SHUTDOWN); | |
353 | static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, pem_show_input, NULL, | |
354 | PEM_INPUT_VOLTAGE); | |
355 | static SENSOR_DEVICE_ATTR_2(in2_alarm, S_IRUGO, pem_show_bool, NULL, | |
356 | PEM_DATA_ALARM_1, | |
357 | ALRM1_VIN_OUT_LIMIT | ALRM1_PRIMARY_FAULT); | |
358 | ||
359 | /* Currents */ | |
360 | static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, pem_show_data, NULL, | |
361 | PEM_DATA_CURRENT); | |
362 | static SENSOR_DEVICE_ATTR_2(curr1_alarm, S_IRUGO, pem_show_bool, NULL, | |
363 | PEM_DATA_ALARM_1, ALRM1_VIN_OVERCURRENT); | |
364 | ||
365 | /* Power */ | |
366 | static SENSOR_DEVICE_ATTR(power1_input, S_IRUGO, pem_show_input, NULL, | |
367 | PEM_INPUT_POWER_LSB); | |
368 | static SENSOR_DEVICE_ATTR_2(power1_alarm, S_IRUGO, pem_show_bool, NULL, | |
369 | PEM_DATA_ALARM_1, ALRM1_POWER_LIMIT); | |
370 | ||
371 | /* Fans */ | |
372 | static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, pem_show_fan, NULL, | |
373 | PEM_FAN_FAN1); | |
374 | static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, pem_show_fan, NULL, | |
375 | PEM_FAN_FAN2); | |
376 | static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, pem_show_fan, NULL, | |
377 | PEM_FAN_FAN3); | |
378 | static SENSOR_DEVICE_ATTR_2(fan1_alarm, S_IRUGO, pem_show_bool, NULL, | |
379 | PEM_DATA_ALARM_2, ALRM2_FAN_FAULT); | |
380 | ||
381 | /* Temperatures */ | |
382 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, pem_show_data, NULL, | |
383 | PEM_DATA_TEMP); | |
384 | static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, pem_show_data, NULL, | |
385 | PEM_DATA_TEMP_MAX); | |
386 | static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, pem_show_data, NULL, | |
387 | PEM_DATA_TEMP_CRIT); | |
388 | static SENSOR_DEVICE_ATTR_2(temp1_alarm, S_IRUGO, pem_show_bool, NULL, | |
389 | PEM_DATA_ALARM_1, ALRM1_TEMP_WARNING); | |
390 | static SENSOR_DEVICE_ATTR_2(temp1_crit_alarm, S_IRUGO, pem_show_bool, NULL, | |
391 | PEM_DATA_ALARM_1, ALRM1_TEMP_SHUTDOWN); | |
392 | static SENSOR_DEVICE_ATTR_2(temp1_fault, S_IRUGO, pem_show_bool, NULL, | |
393 | PEM_DATA_ALARM_2, ALRM2_TEMP_FAULT); | |
394 | ||
395 | static struct attribute *pem_attributes[] = { | |
396 | &sensor_dev_attr_in1_input.dev_attr.attr, | |
d668a8b0 | 397 | &sensor_dev_attr_in1_alarm.dev_attr.attr, |
502b5a01 GR |
398 | &sensor_dev_attr_in1_crit_alarm.dev_attr.attr, |
399 | &sensor_dev_attr_in2_alarm.dev_attr.attr, | |
400 | ||
401 | &sensor_dev_attr_curr1_alarm.dev_attr.attr, | |
402 | ||
403 | &sensor_dev_attr_power1_alarm.dev_attr.attr, | |
404 | ||
405 | &sensor_dev_attr_fan1_alarm.dev_attr.attr, | |
406 | ||
407 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
408 | &sensor_dev_attr_temp1_max.dev_attr.attr, | |
409 | &sensor_dev_attr_temp1_crit.dev_attr.attr, | |
410 | &sensor_dev_attr_temp1_alarm.dev_attr.attr, | |
411 | &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr, | |
412 | &sensor_dev_attr_temp1_fault.dev_attr.attr, | |
413 | ||
414 | NULL, | |
415 | }; | |
416 | ||
417 | static const struct attribute_group pem_group = { | |
418 | .attrs = pem_attributes, | |
419 | }; | |
420 | ||
421 | static struct attribute *pem_input_attributes[] = { | |
422 | &sensor_dev_attr_in2_input.dev_attr.attr, | |
423 | &sensor_dev_attr_curr1_input.dev_attr.attr, | |
424 | &sensor_dev_attr_power1_input.dev_attr.attr, | |
df069079 | 425 | NULL |
502b5a01 GR |
426 | }; |
427 | ||
428 | static const struct attribute_group pem_input_group = { | |
429 | .attrs = pem_input_attributes, | |
430 | }; | |
431 | ||
432 | static struct attribute *pem_fan_attributes[] = { | |
433 | &sensor_dev_attr_fan1_input.dev_attr.attr, | |
434 | &sensor_dev_attr_fan2_input.dev_attr.attr, | |
435 | &sensor_dev_attr_fan3_input.dev_attr.attr, | |
df069079 | 436 | NULL |
502b5a01 GR |
437 | }; |
438 | ||
439 | static const struct attribute_group pem_fan_group = { | |
440 | .attrs = pem_fan_attributes, | |
441 | }; | |
442 | ||
443 | static int pem_probe(struct i2c_client *client, | |
444 | const struct i2c_device_id *id) | |
445 | { | |
446 | struct i2c_adapter *adapter = client->adapter; | |
447 | struct pem_data *data; | |
448 | int ret; | |
449 | ||
450 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BLOCK_DATA | |
451 | | I2C_FUNC_SMBUS_WRITE_BYTE)) | |
452 | return -ENODEV; | |
453 | ||
07404aab | 454 | data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL); |
502b5a01 GR |
455 | if (!data) |
456 | return -ENOMEM; | |
457 | ||
458 | i2c_set_clientdata(client, data); | |
459 | mutex_init(&data->update_lock); | |
460 | ||
461 | /* | |
462 | * We use the next two commands to determine if the device is really | |
463 | * there. | |
464 | */ | |
465 | ret = pem_read_block(client, PEM_READ_FIRMWARE_REV, | |
466 | data->firmware_rev, sizeof(data->firmware_rev)); | |
467 | if (ret < 0) | |
07404aab | 468 | return ret; |
502b5a01 GR |
469 | |
470 | ret = i2c_smbus_write_byte(client, PEM_CLEAR_INFO_FLAGS); | |
471 | if (ret < 0) | |
07404aab | 472 | return ret; |
502b5a01 GR |
473 | |
474 | dev_info(&client->dev, "Firmware revision %d.%d.%d\n", | |
475 | data->firmware_rev[0], data->firmware_rev[1], | |
476 | data->firmware_rev[2]); | |
477 | ||
478 | /* Register sysfs hooks */ | |
479 | ret = sysfs_create_group(&client->dev.kobj, &pem_group); | |
480 | if (ret) | |
07404aab | 481 | return ret; |
502b5a01 GR |
482 | |
483 | /* | |
484 | * Check if input readings are supported. | |
485 | * This is the case if we can read input data, | |
486 | * and if the returned data is not all zeros. | |
487 | * Note that input alarms are always supported. | |
488 | */ | |
489 | ret = pem_read_block(client, PEM_READ_INPUT_STRING, | |
490 | data->input_string, | |
491 | sizeof(data->input_string) - 1); | |
492 | if (!ret && (data->input_string[0] || data->input_string[1] || | |
493 | data->input_string[2])) | |
494 | data->input_length = sizeof(data->input_string) - 1; | |
495 | else if (ret < 0) { | |
496 | /* Input string is one byte longer for some devices */ | |
497 | ret = pem_read_block(client, PEM_READ_INPUT_STRING, | |
498 | data->input_string, | |
499 | sizeof(data->input_string)); | |
500 | if (!ret && (data->input_string[0] || data->input_string[1] || | |
501 | data->input_string[2] || data->input_string[3])) | |
502 | data->input_length = sizeof(data->input_string); | |
503 | } | |
504 | ret = 0; | |
505 | if (data->input_length) { | |
506 | ret = sysfs_create_group(&client->dev.kobj, &pem_input_group); | |
507 | if (ret) | |
508 | goto out_remove_groups; | |
509 | } | |
510 | ||
511 | /* | |
512 | * Check if fan speed readings are supported. | |
513 | * This is the case if we can read fan speed data, | |
514 | * and if the returned data is not all zeros. | |
515 | * Note that the fan alarm is always supported. | |
516 | */ | |
517 | ret = pem_read_block(client, PEM_READ_FAN_SPEED, | |
518 | data->fan_speed, | |
519 | sizeof(data->fan_speed)); | |
520 | if (!ret && (data->fan_speed[0] || data->fan_speed[1] || | |
521 | data->fan_speed[2] || data->fan_speed[3])) { | |
522 | data->fans_supported = true; | |
523 | ret = sysfs_create_group(&client->dev.kobj, &pem_fan_group); | |
524 | if (ret) | |
525 | goto out_remove_groups; | |
526 | } | |
527 | ||
528 | data->hwmon_dev = hwmon_device_register(&client->dev); | |
529 | if (IS_ERR(data->hwmon_dev)) { | |
530 | ret = PTR_ERR(data->hwmon_dev); | |
531 | goto out_remove_groups; | |
532 | } | |
533 | ||
534 | return 0; | |
535 | ||
536 | out_remove_groups: | |
537 | sysfs_remove_group(&client->dev.kobj, &pem_input_group); | |
538 | sysfs_remove_group(&client->dev.kobj, &pem_fan_group); | |
539 | sysfs_remove_group(&client->dev.kobj, &pem_group); | |
502b5a01 GR |
540 | return ret; |
541 | } | |
542 | ||
543 | static int pem_remove(struct i2c_client *client) | |
544 | { | |
545 | struct pem_data *data = i2c_get_clientdata(client); | |
546 | ||
547 | hwmon_device_unregister(data->hwmon_dev); | |
548 | ||
549 | sysfs_remove_group(&client->dev.kobj, &pem_input_group); | |
550 | sysfs_remove_group(&client->dev.kobj, &pem_fan_group); | |
551 | sysfs_remove_group(&client->dev.kobj, &pem_group); | |
552 | ||
502b5a01 GR |
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 | ||
f0967eea | 571 | module_i2c_driver(pem_driver); |
502b5a01 | 572 | |
bb9a80e5 | 573 | MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>"); |
502b5a01 GR |
574 | MODULE_DESCRIPTION("Lineage CPL PEM hardware monitoring driver"); |
575 | MODULE_LICENSE("GPL"); |