1 /***************************************************************************
2 * Copyright (C) 2010-2012 Hans de Goede <hdegoede@redhat.com> *
3 * *
4 * This program is free software; you can redistribute it and/or modify *
5 * it under the terms of the GNU General Public License as published by *
6 * the Free Software Foundation; either version 2 of the License, or *
7 * (at your option) any later version. *
8 * *
9 * This program is distributed in the hope that it will be useful, *
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
12 * GNU General Public License for more details. *
13 * *
14 * You should have received a copy of the GNU General Public License *
15 * along with this program; if not, write to the *
16 * Free Software Foundation, Inc., *
17 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
18 ***************************************************************************/
19
20 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
21
22 #include <linux/module.h>
23 #include <linux/init.h>
24 #include <linux/slab.h>
25 #include <linux/jiffies.h>
26 #include <linux/platform_device.h>
27 #include <linux/hwmon.h>
28 #include <linux/hwmon-sysfs.h>
29 #include <linux/err.h>
30 #include <linux/mutex.h>
31 #include "sch56xx-common.h"
32
33 #define DRVNAME "sch5627"
34 #define DEVNAME DRVNAME /* We only support one model */
35
36 #define SCH5627_HWMON_ID 0xa5
37 #define SCH5627_COMPANY_ID 0x5c
38 #define SCH5627_PRIMARY_ID 0xa0
39
40 #define SCH5627_REG_BUILD_CODE 0x39
41 #define SCH5627_REG_BUILD_ID 0x3a
42 #define SCH5627_REG_HWMON_ID 0x3c
43 #define SCH5627_REG_HWMON_REV 0x3d
44 #define SCH5627_REG_COMPANY_ID 0x3e
45 #define SCH5627_REG_PRIMARY_ID 0x3f
46 #define SCH5627_REG_CTRL 0x40
47
48 #define SCH5627_NO_TEMPS 8
49 #define SCH5627_NO_FANS 4
50 #define SCH5627_NO_IN 5
51
52 static const u16 SCH5627_REG_TEMP_MSB[SCH5627_NO_TEMPS] = {
53 0x2B, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x180, 0x181 };
54 static const u16 SCH5627_REG_TEMP_LSN[SCH5627_NO_TEMPS] = {
55 0xE2, 0xE1, 0xE1, 0xE5, 0xE5, 0xE6, 0x182, 0x182 };
56 static const u16 SCH5627_REG_TEMP_HIGH_NIBBLE[SCH5627_NO_TEMPS] = {
57 0, 0, 1, 1, 0, 0, 0, 1 };
58 static const u16 SCH5627_REG_TEMP_HIGH[SCH5627_NO_TEMPS] = {
59 0x61, 0x57, 0x59, 0x5B, 0x5D, 0x5F, 0x184, 0x186 };
60 static const u16 SCH5627_REG_TEMP_ABS[SCH5627_NO_TEMPS] = {
61 0x9B, 0x96, 0x97, 0x98, 0x99, 0x9A, 0x1A8, 0x1A9 };
62
63 static const u16 SCH5627_REG_FAN[SCH5627_NO_FANS] = {
64 0x2C, 0x2E, 0x30, 0x32 };
65 static const u16 SCH5627_REG_FAN_MIN[SCH5627_NO_FANS] = {
66 0x62, 0x64, 0x66, 0x68 };
67
68 static const u16 SCH5627_REG_IN_MSB[SCH5627_NO_IN] = {
69 0x22, 0x23, 0x24, 0x25, 0x189 };
70 static const u16 SCH5627_REG_IN_LSN[SCH5627_NO_IN] = {
71 0xE4, 0xE4, 0xE3, 0xE3, 0x18A };
72 static const u16 SCH5627_REG_IN_HIGH_NIBBLE[SCH5627_NO_IN] = {
73 1, 0, 1, 0, 1 };
74 static const u16 SCH5627_REG_IN_FACTOR[SCH5627_NO_IN] = {
75 10745, 3660, 9765, 10745, 3660 };
76 static const char * const SCH5627_IN_LABELS[SCH5627_NO_IN] = {
77 "VCC", "VTT", "VBAT", "VTR", "V_IN" };
78
79 struct sch5627_data {
80 unsigned short addr;
81 struct device *hwmon_dev;
82 struct sch56xx_watchdog_data *watchdog;
83 u8 control;
84 u8 temp_max[SCH5627_NO_TEMPS];
85 u8 temp_crit[SCH5627_NO_TEMPS];
86 u16 fan_min[SCH5627_NO_FANS];
87
88 struct mutex update_lock;
89 unsigned long last_battery; /* In jiffies */
90 char valid; /* !=0 if following fields are valid */
91 unsigned long last_updated; /* In jiffies */
92 u16 temp[SCH5627_NO_TEMPS];
93 u16 fan[SCH5627_NO_FANS];
94 u16 in[SCH5627_NO_IN];
95 };
96
sch5627_update_device(struct device * dev)97 static struct sch5627_data *sch5627_update_device(struct device *dev)
98 {
99 struct sch5627_data *data = dev_get_drvdata(dev);
100 struct sch5627_data *ret = data;
101 int i, val;
102
103 mutex_lock(&data->update_lock);
104
105 /* Trigger a Vbat voltage measurement every 5 minutes */
106 if (time_after(jiffies, data->last_battery + 300 * HZ)) {
107 sch56xx_write_virtual_reg(data->addr, SCH5627_REG_CTRL,
108 data->control | 0x10);
109 data->last_battery = jiffies;
110 }
111
112 /* Cache the values for 1 second */
113 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
114 for (i = 0; i < SCH5627_NO_TEMPS; i++) {
115 val = sch56xx_read_virtual_reg12(data->addr,
116 SCH5627_REG_TEMP_MSB[i],
117 SCH5627_REG_TEMP_LSN[i],
118 SCH5627_REG_TEMP_HIGH_NIBBLE[i]);
119 if (unlikely(val < 0)) {
120 ret = ERR_PTR(val);
121 goto abort;
122 }
123 data->temp[i] = val;
124 }
125
126 for (i = 0; i < SCH5627_NO_FANS; i++) {
127 val = sch56xx_read_virtual_reg16(data->addr,
128 SCH5627_REG_FAN[i]);
129 if (unlikely(val < 0)) {
130 ret = ERR_PTR(val);
131 goto abort;
132 }
133 data->fan[i] = val;
134 }
135
136 for (i = 0; i < SCH5627_NO_IN; i++) {
137 val = sch56xx_read_virtual_reg12(data->addr,
138 SCH5627_REG_IN_MSB[i],
139 SCH5627_REG_IN_LSN[i],
140 SCH5627_REG_IN_HIGH_NIBBLE[i]);
141 if (unlikely(val < 0)) {
142 ret = ERR_PTR(val);
143 goto abort;
144 }
145 data->in[i] = val;
146 }
147
148 data->last_updated = jiffies;
149 data->valid = 1;
150 }
151 abort:
152 mutex_unlock(&data->update_lock);
153 return ret;
154 }
155
sch5627_read_limits(struct sch5627_data * data)156 static int sch5627_read_limits(struct sch5627_data *data)
157 {
158 int i, val;
159
160 for (i = 0; i < SCH5627_NO_TEMPS; i++) {
161 /*
162 * Note what SMSC calls ABS, is what lm_sensors calls max
163 * (aka high), and HIGH is what lm_sensors calls crit.
164 */
165 val = sch56xx_read_virtual_reg(data->addr,
166 SCH5627_REG_TEMP_ABS[i]);
167 if (val < 0)
168 return val;
169 data->temp_max[i] = val;
170
171 val = sch56xx_read_virtual_reg(data->addr,
172 SCH5627_REG_TEMP_HIGH[i]);
173 if (val < 0)
174 return val;
175 data->temp_crit[i] = val;
176 }
177 for (i = 0; i < SCH5627_NO_FANS; i++) {
178 val = sch56xx_read_virtual_reg16(data->addr,
179 SCH5627_REG_FAN_MIN[i]);
180 if (val < 0)
181 return val;
182 data->fan_min[i] = val;
183 }
184
185 return 0;
186 }
187
reg_to_temp(u16 reg)188 static int reg_to_temp(u16 reg)
189 {
190 return (reg * 625) / 10 - 64000;
191 }
192
reg_to_temp_limit(u8 reg)193 static int reg_to_temp_limit(u8 reg)
194 {
195 return (reg - 64) * 1000;
196 }
197
reg_to_rpm(u16 reg)198 static int reg_to_rpm(u16 reg)
199 {
200 if (reg == 0)
201 return -EIO;
202 if (reg == 0xffff)
203 return 0;
204
205 return 5400540 / reg;
206 }
207
show_name(struct device * dev,struct device_attribute * devattr,char * buf)208 static ssize_t show_name(struct device *dev, struct device_attribute *devattr,
209 char *buf)
210 {
211 return snprintf(buf, PAGE_SIZE, "%s\n", DEVNAME);
212 }
213
show_temp(struct device * dev,struct device_attribute * devattr,char * buf)214 static ssize_t show_temp(struct device *dev, struct device_attribute
215 *devattr, char *buf)
216 {
217 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
218 struct sch5627_data *data = sch5627_update_device(dev);
219 int val;
220
221 if (IS_ERR(data))
222 return PTR_ERR(data);
223
224 val = reg_to_temp(data->temp[attr->index]);
225 return snprintf(buf, PAGE_SIZE, "%d\n", val);
226 }
227
show_temp_fault(struct device * dev,struct device_attribute * devattr,char * buf)228 static ssize_t show_temp_fault(struct device *dev, struct device_attribute
229 *devattr, char *buf)
230 {
231 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
232 struct sch5627_data *data = sch5627_update_device(dev);
233
234 if (IS_ERR(data))
235 return PTR_ERR(data);
236
237 return snprintf(buf, PAGE_SIZE, "%d\n", data->temp[attr->index] == 0);
238 }
239
show_temp_max(struct device * dev,struct device_attribute * devattr,char * buf)240 static ssize_t show_temp_max(struct device *dev, struct device_attribute
241 *devattr, char *buf)
242 {
243 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
244 struct sch5627_data *data = dev_get_drvdata(dev);
245 int val;
246
247 val = reg_to_temp_limit(data->temp_max[attr->index]);
248 return snprintf(buf, PAGE_SIZE, "%d\n", val);
249 }
250
show_temp_crit(struct device * dev,struct device_attribute * devattr,char * buf)251 static ssize_t show_temp_crit(struct device *dev, struct device_attribute
252 *devattr, char *buf)
253 {
254 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
255 struct sch5627_data *data = dev_get_drvdata(dev);
256 int val;
257
258 val = reg_to_temp_limit(data->temp_crit[attr->index]);
259 return snprintf(buf, PAGE_SIZE, "%d\n", val);
260 }
261
show_fan(struct device * dev,struct device_attribute * devattr,char * buf)262 static ssize_t show_fan(struct device *dev, struct device_attribute
263 *devattr, char *buf)
264 {
265 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
266 struct sch5627_data *data = sch5627_update_device(dev);
267 int val;
268
269 if (IS_ERR(data))
270 return PTR_ERR(data);
271
272 val = reg_to_rpm(data->fan[attr->index]);
273 if (val < 0)
274 return val;
275
276 return snprintf(buf, PAGE_SIZE, "%d\n", val);
277 }
278
show_fan_fault(struct device * dev,struct device_attribute * devattr,char * buf)279 static ssize_t show_fan_fault(struct device *dev, struct device_attribute
280 *devattr, char *buf)
281 {
282 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
283 struct sch5627_data *data = sch5627_update_device(dev);
284
285 if (IS_ERR(data))
286 return PTR_ERR(data);
287
288 return snprintf(buf, PAGE_SIZE, "%d\n",
289 data->fan[attr->index] == 0xffff);
290 }
291
show_fan_min(struct device * dev,struct device_attribute * devattr,char * buf)292 static ssize_t show_fan_min(struct device *dev, struct device_attribute
293 *devattr, char *buf)
294 {
295 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
296 struct sch5627_data *data = dev_get_drvdata(dev);
297 int val = reg_to_rpm(data->fan_min[attr->index]);
298 if (val < 0)
299 return val;
300
301 return snprintf(buf, PAGE_SIZE, "%d\n", val);
302 }
303
show_in(struct device * dev,struct device_attribute * devattr,char * buf)304 static ssize_t show_in(struct device *dev, struct device_attribute
305 *devattr, char *buf)
306 {
307 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
308 struct sch5627_data *data = sch5627_update_device(dev);
309 int val;
310
311 if (IS_ERR(data))
312 return PTR_ERR(data);
313
314 val = DIV_ROUND_CLOSEST(
315 data->in[attr->index] * SCH5627_REG_IN_FACTOR[attr->index],
316 10000);
317 return snprintf(buf, PAGE_SIZE, "%d\n", val);
318 }
319
show_in_label(struct device * dev,struct device_attribute * devattr,char * buf)320 static ssize_t show_in_label(struct device *dev, struct device_attribute
321 *devattr, char *buf)
322 {
323 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
324
325 return snprintf(buf, PAGE_SIZE, "%s\n",
326 SCH5627_IN_LABELS[attr->index]);
327 }
328
329 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
330 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
331 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
332 static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
333 static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3);
334 static SENSOR_DEVICE_ATTR(temp5_input, S_IRUGO, show_temp, NULL, 4);
335 static SENSOR_DEVICE_ATTR(temp6_input, S_IRUGO, show_temp, NULL, 5);
336 static SENSOR_DEVICE_ATTR(temp7_input, S_IRUGO, show_temp, NULL, 6);
337 static SENSOR_DEVICE_ATTR(temp8_input, S_IRUGO, show_temp, NULL, 7);
338 static SENSOR_DEVICE_ATTR(temp1_fault, S_IRUGO, show_temp_fault, NULL, 0);
339 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_temp_fault, NULL, 1);
340 static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_temp_fault, NULL, 2);
341 static SENSOR_DEVICE_ATTR(temp4_fault, S_IRUGO, show_temp_fault, NULL, 3);
342 static SENSOR_DEVICE_ATTR(temp5_fault, S_IRUGO, show_temp_fault, NULL, 4);
343 static SENSOR_DEVICE_ATTR(temp6_fault, S_IRUGO, show_temp_fault, NULL, 5);
344 static SENSOR_DEVICE_ATTR(temp7_fault, S_IRUGO, show_temp_fault, NULL, 6);
345 static SENSOR_DEVICE_ATTR(temp8_fault, S_IRUGO, show_temp_fault, NULL, 7);
346 static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_temp_max, NULL, 0);
347 static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO, show_temp_max, NULL, 1);
348 static SENSOR_DEVICE_ATTR(temp3_max, S_IRUGO, show_temp_max, NULL, 2);
349 static SENSOR_DEVICE_ATTR(temp4_max, S_IRUGO, show_temp_max, NULL, 3);
350 static SENSOR_DEVICE_ATTR(temp5_max, S_IRUGO, show_temp_max, NULL, 4);
351 static SENSOR_DEVICE_ATTR(temp6_max, S_IRUGO, show_temp_max, NULL, 5);
352 static SENSOR_DEVICE_ATTR(temp7_max, S_IRUGO, show_temp_max, NULL, 6);
353 static SENSOR_DEVICE_ATTR(temp8_max, S_IRUGO, show_temp_max, NULL, 7);
354 static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp_crit, NULL, 0);
355 static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO, show_temp_crit, NULL, 1);
356 static SENSOR_DEVICE_ATTR(temp3_crit, S_IRUGO, show_temp_crit, NULL, 2);
357 static SENSOR_DEVICE_ATTR(temp4_crit, S_IRUGO, show_temp_crit, NULL, 3);
358 static SENSOR_DEVICE_ATTR(temp5_crit, S_IRUGO, show_temp_crit, NULL, 4);
359 static SENSOR_DEVICE_ATTR(temp6_crit, S_IRUGO, show_temp_crit, NULL, 5);
360 static SENSOR_DEVICE_ATTR(temp7_crit, S_IRUGO, show_temp_crit, NULL, 6);
361 static SENSOR_DEVICE_ATTR(temp8_crit, S_IRUGO, show_temp_crit, NULL, 7);
362
363 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0);
364 static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1);
365 static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, show_fan, NULL, 2);
366 static SENSOR_DEVICE_ATTR(fan4_input, S_IRUGO, show_fan, NULL, 3);
367 static SENSOR_DEVICE_ATTR(fan1_fault, S_IRUGO, show_fan_fault, NULL, 0);
368 static SENSOR_DEVICE_ATTR(fan2_fault, S_IRUGO, show_fan_fault, NULL, 1);
369 static SENSOR_DEVICE_ATTR(fan3_fault, S_IRUGO, show_fan_fault, NULL, 2);
370 static SENSOR_DEVICE_ATTR(fan4_fault, S_IRUGO, show_fan_fault, NULL, 3);
371 static SENSOR_DEVICE_ATTR(fan1_min, S_IRUGO, show_fan_min, NULL, 0);
372 static SENSOR_DEVICE_ATTR(fan2_min, S_IRUGO, show_fan_min, NULL, 1);
373 static SENSOR_DEVICE_ATTR(fan3_min, S_IRUGO, show_fan_min, NULL, 2);
374 static SENSOR_DEVICE_ATTR(fan4_min, S_IRUGO, show_fan_min, NULL, 3);
375
376 static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, show_in, NULL, 0);
377 static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, show_in, NULL, 1);
378 static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, show_in, NULL, 2);
379 static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, show_in, NULL, 3);
380 static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, show_in, NULL, 4);
381 static SENSOR_DEVICE_ATTR(in0_label, S_IRUGO, show_in_label, NULL, 0);
382 static SENSOR_DEVICE_ATTR(in1_label, S_IRUGO, show_in_label, NULL, 1);
383 static SENSOR_DEVICE_ATTR(in2_label, S_IRUGO, show_in_label, NULL, 2);
384 static SENSOR_DEVICE_ATTR(in3_label, S_IRUGO, show_in_label, NULL, 3);
385
386 static struct attribute *sch5627_attributes[] = {
387 &dev_attr_name.attr,
388
389 &sensor_dev_attr_temp1_input.dev_attr.attr,
390 &sensor_dev_attr_temp2_input.dev_attr.attr,
391 &sensor_dev_attr_temp3_input.dev_attr.attr,
392 &sensor_dev_attr_temp4_input.dev_attr.attr,
393 &sensor_dev_attr_temp5_input.dev_attr.attr,
394 &sensor_dev_attr_temp6_input.dev_attr.attr,
395 &sensor_dev_attr_temp7_input.dev_attr.attr,
396 &sensor_dev_attr_temp8_input.dev_attr.attr,
397 &sensor_dev_attr_temp1_fault.dev_attr.attr,
398 &sensor_dev_attr_temp2_fault.dev_attr.attr,
399 &sensor_dev_attr_temp3_fault.dev_attr.attr,
400 &sensor_dev_attr_temp4_fault.dev_attr.attr,
401 &sensor_dev_attr_temp5_fault.dev_attr.attr,
402 &sensor_dev_attr_temp6_fault.dev_attr.attr,
403 &sensor_dev_attr_temp7_fault.dev_attr.attr,
404 &sensor_dev_attr_temp8_fault.dev_attr.attr,
405 &sensor_dev_attr_temp1_max.dev_attr.attr,
406 &sensor_dev_attr_temp2_max.dev_attr.attr,
407 &sensor_dev_attr_temp3_max.dev_attr.attr,
408 &sensor_dev_attr_temp4_max.dev_attr.attr,
409 &sensor_dev_attr_temp5_max.dev_attr.attr,
410 &sensor_dev_attr_temp6_max.dev_attr.attr,
411 &sensor_dev_attr_temp7_max.dev_attr.attr,
412 &sensor_dev_attr_temp8_max.dev_attr.attr,
413 &sensor_dev_attr_temp1_crit.dev_attr.attr,
414 &sensor_dev_attr_temp2_crit.dev_attr.attr,
415 &sensor_dev_attr_temp3_crit.dev_attr.attr,
416 &sensor_dev_attr_temp4_crit.dev_attr.attr,
417 &sensor_dev_attr_temp5_crit.dev_attr.attr,
418 &sensor_dev_attr_temp6_crit.dev_attr.attr,
419 &sensor_dev_attr_temp7_crit.dev_attr.attr,
420 &sensor_dev_attr_temp8_crit.dev_attr.attr,
421
422 &sensor_dev_attr_fan1_input.dev_attr.attr,
423 &sensor_dev_attr_fan2_input.dev_attr.attr,
424 &sensor_dev_attr_fan3_input.dev_attr.attr,
425 &sensor_dev_attr_fan4_input.dev_attr.attr,
426 &sensor_dev_attr_fan1_fault.dev_attr.attr,
427 &sensor_dev_attr_fan2_fault.dev_attr.attr,
428 &sensor_dev_attr_fan3_fault.dev_attr.attr,
429 &sensor_dev_attr_fan4_fault.dev_attr.attr,
430 &sensor_dev_attr_fan1_min.dev_attr.attr,
431 &sensor_dev_attr_fan2_min.dev_attr.attr,
432 &sensor_dev_attr_fan3_min.dev_attr.attr,
433 &sensor_dev_attr_fan4_min.dev_attr.attr,
434
435 &sensor_dev_attr_in0_input.dev_attr.attr,
436 &sensor_dev_attr_in1_input.dev_attr.attr,
437 &sensor_dev_attr_in2_input.dev_attr.attr,
438 &sensor_dev_attr_in3_input.dev_attr.attr,
439 &sensor_dev_attr_in4_input.dev_attr.attr,
440 &sensor_dev_attr_in0_label.dev_attr.attr,
441 &sensor_dev_attr_in1_label.dev_attr.attr,
442 &sensor_dev_attr_in2_label.dev_attr.attr,
443 &sensor_dev_attr_in3_label.dev_attr.attr,
444 /* No in4_label as in4 is a generic input pin */
445
446 NULL
447 };
448
449 static const struct attribute_group sch5627_group = {
450 .attrs = sch5627_attributes,
451 };
452
sch5627_remove(struct platform_device * pdev)453 static int sch5627_remove(struct platform_device *pdev)
454 {
455 struct sch5627_data *data = platform_get_drvdata(pdev);
456
457 if (data->watchdog)
458 sch56xx_watchdog_unregister(data->watchdog);
459
460 if (data->hwmon_dev)
461 hwmon_device_unregister(data->hwmon_dev);
462
463 sysfs_remove_group(&pdev->dev.kobj, &sch5627_group);
464
465 return 0;
466 }
467
sch5627_probe(struct platform_device * pdev)468 static int sch5627_probe(struct platform_device *pdev)
469 {
470 struct sch5627_data *data;
471 int err, build_code, build_id, hwmon_rev, val;
472
473 data = devm_kzalloc(&pdev->dev, sizeof(struct sch5627_data),
474 GFP_KERNEL);
475 if (!data)
476 return -ENOMEM;
477
478 data->addr = platform_get_resource(pdev, IORESOURCE_IO, 0)->start;
479 mutex_init(&data->update_lock);
480 platform_set_drvdata(pdev, data);
481
482 val = sch56xx_read_virtual_reg(data->addr, SCH5627_REG_HWMON_ID);
483 if (val < 0) {
484 err = val;
485 goto error;
486 }
487 if (val != SCH5627_HWMON_ID) {
488 pr_err("invalid %s id: 0x%02X (expected 0x%02X)\n", "hwmon",
489 val, SCH5627_HWMON_ID);
490 err = -ENODEV;
491 goto error;
492 }
493
494 val = sch56xx_read_virtual_reg(data->addr, SCH5627_REG_COMPANY_ID);
495 if (val < 0) {
496 err = val;
497 goto error;
498 }
499 if (val != SCH5627_COMPANY_ID) {
500 pr_err("invalid %s id: 0x%02X (expected 0x%02X)\n", "company",
501 val, SCH5627_COMPANY_ID);
502 err = -ENODEV;
503 goto error;
504 }
505
506 val = sch56xx_read_virtual_reg(data->addr, SCH5627_REG_PRIMARY_ID);
507 if (val < 0) {
508 err = val;
509 goto error;
510 }
511 if (val != SCH5627_PRIMARY_ID) {
512 pr_err("invalid %s id: 0x%02X (expected 0x%02X)\n", "primary",
513 val, SCH5627_PRIMARY_ID);
514 err = -ENODEV;
515 goto error;
516 }
517
518 build_code = sch56xx_read_virtual_reg(data->addr,
519 SCH5627_REG_BUILD_CODE);
520 if (build_code < 0) {
521 err = build_code;
522 goto error;
523 }
524
525 build_id = sch56xx_read_virtual_reg16(data->addr,
526 SCH5627_REG_BUILD_ID);
527 if (build_id < 0) {
528 err = build_id;
529 goto error;
530 }
531
532 hwmon_rev = sch56xx_read_virtual_reg(data->addr,
533 SCH5627_REG_HWMON_REV);
534 if (hwmon_rev < 0) {
535 err = hwmon_rev;
536 goto error;
537 }
538
539 val = sch56xx_read_virtual_reg(data->addr, SCH5627_REG_CTRL);
540 if (val < 0) {
541 err = val;
542 goto error;
543 }
544 data->control = val;
545 if (!(data->control & 0x01)) {
546 pr_err("hardware monitoring not enabled\n");
547 err = -ENODEV;
548 goto error;
549 }
550 /* Trigger a Vbat voltage measurement, so that we get a valid reading
551 the first time we read Vbat */
552 sch56xx_write_virtual_reg(data->addr, SCH5627_REG_CTRL,
553 data->control | 0x10);
554 data->last_battery = jiffies;
555
556 /*
557 * Read limits, we do this only once as reading a register on
558 * the sch5627 is quite expensive (and they don't change).
559 */
560 err = sch5627_read_limits(data);
561 if (err)
562 goto error;
563
564 pr_info("found %s chip at %#hx\n", DEVNAME, data->addr);
565 pr_info("firmware build: code 0x%02X, id 0x%04X, hwmon: rev 0x%02X\n",
566 build_code, build_id, hwmon_rev);
567
568 /* Register sysfs interface files */
569 err = sysfs_create_group(&pdev->dev.kobj, &sch5627_group);
570 if (err)
571 goto error;
572
573 data->hwmon_dev = hwmon_device_register(&pdev->dev);
574 if (IS_ERR(data->hwmon_dev)) {
575 err = PTR_ERR(data->hwmon_dev);
576 data->hwmon_dev = NULL;
577 goto error;
578 }
579
580 /* Note failing to register the watchdog is not a fatal error */
581 data->watchdog = sch56xx_watchdog_register(&pdev->dev, data->addr,
582 (build_code << 24) | (build_id << 8) | hwmon_rev,
583 &data->update_lock, 1);
584
585 return 0;
586
587 error:
588 sch5627_remove(pdev);
589 return err;
590 }
591
592 static struct platform_driver sch5627_driver = {
593 .driver = {
594 .owner = THIS_MODULE,
595 .name = DRVNAME,
596 },
597 .probe = sch5627_probe,
598 .remove = sch5627_remove,
599 };
600
601 module_platform_driver(sch5627_driver);
602
603 MODULE_DESCRIPTION("SMSC SCH5627 Hardware Monitoring Driver");
604 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
605 MODULE_LICENSE("GPL");
606