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
52static const u16 SCH5627_REG_TEMP_MSB[SCH5627_NO_TEMPS] = {
53	0x2B, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x180, 0x181 };
54static const u16 SCH5627_REG_TEMP_LSN[SCH5627_NO_TEMPS] = {
55	0xE2, 0xE1, 0xE1, 0xE5, 0xE5, 0xE6, 0x182, 0x182 };
56static const u16 SCH5627_REG_TEMP_HIGH_NIBBLE[SCH5627_NO_TEMPS] = {
57	0, 0, 1, 1, 0, 0, 0, 1 };
58static const u16 SCH5627_REG_TEMP_HIGH[SCH5627_NO_TEMPS] = {
59	0x61, 0x57, 0x59, 0x5B, 0x5D, 0x5F, 0x184, 0x186 };
60static const u16 SCH5627_REG_TEMP_ABS[SCH5627_NO_TEMPS] = {
61	0x9B, 0x96, 0x97, 0x98, 0x99, 0x9A, 0x1A8, 0x1A9 };
62
63static const u16 SCH5627_REG_FAN[SCH5627_NO_FANS] = {
64	0x2C, 0x2E, 0x30, 0x32 };
65static const u16 SCH5627_REG_FAN_MIN[SCH5627_NO_FANS] = {
66	0x62, 0x64, 0x66, 0x68 };
67
68static const u16 SCH5627_REG_IN_MSB[SCH5627_NO_IN] = {
69	0x22, 0x23, 0x24, 0x25, 0x189 };
70static const u16 SCH5627_REG_IN_LSN[SCH5627_NO_IN] = {
71	0xE4, 0xE4, 0xE3, 0xE3, 0x18A };
72static const u16 SCH5627_REG_IN_HIGH_NIBBLE[SCH5627_NO_IN] = {
73	1, 0, 1, 0, 1 };
74static const u16 SCH5627_REG_IN_FACTOR[SCH5627_NO_IN] = {
75	10745, 3660, 9765, 10745, 3660 };
76static const char * const SCH5627_IN_LABELS[SCH5627_NO_IN] = {
77	"VCC", "VTT", "VBAT", "VTR", "V_IN" };
78
79struct 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
97static 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	}
151abort:
152	mutex_unlock(&data->update_lock);
153	return ret;
154}
155
156static 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
188static int reg_to_temp(u16 reg)
189{
190	return (reg * 625) / 10 - 64000;
191}
192
193static int reg_to_temp_limit(u8 reg)
194{
195	return (reg - 64) * 1000;
196}
197
198static 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
208static 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
214static 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
228static 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
240static 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
251static 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
262static 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
279static 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
292static 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
304static 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
320static 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
329static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
330static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
331static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
332static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
333static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3);
334static SENSOR_DEVICE_ATTR(temp5_input, S_IRUGO, show_temp, NULL, 4);
335static SENSOR_DEVICE_ATTR(temp6_input, S_IRUGO, show_temp, NULL, 5);
336static SENSOR_DEVICE_ATTR(temp7_input, S_IRUGO, show_temp, NULL, 6);
337static SENSOR_DEVICE_ATTR(temp8_input, S_IRUGO, show_temp, NULL, 7);
338static SENSOR_DEVICE_ATTR(temp1_fault, S_IRUGO, show_temp_fault, NULL, 0);
339static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_temp_fault, NULL, 1);
340static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_temp_fault, NULL, 2);
341static SENSOR_DEVICE_ATTR(temp4_fault, S_IRUGO, show_temp_fault, NULL, 3);
342static SENSOR_DEVICE_ATTR(temp5_fault, S_IRUGO, show_temp_fault, NULL, 4);
343static SENSOR_DEVICE_ATTR(temp6_fault, S_IRUGO, show_temp_fault, NULL, 5);
344static SENSOR_DEVICE_ATTR(temp7_fault, S_IRUGO, show_temp_fault, NULL, 6);
345static SENSOR_DEVICE_ATTR(temp8_fault, S_IRUGO, show_temp_fault, NULL, 7);
346static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_temp_max, NULL, 0);
347static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO, show_temp_max, NULL, 1);
348static SENSOR_DEVICE_ATTR(temp3_max, S_IRUGO, show_temp_max, NULL, 2);
349static SENSOR_DEVICE_ATTR(temp4_max, S_IRUGO, show_temp_max, NULL, 3);
350static SENSOR_DEVICE_ATTR(temp5_max, S_IRUGO, show_temp_max, NULL, 4);
351static SENSOR_DEVICE_ATTR(temp6_max, S_IRUGO, show_temp_max, NULL, 5);
352static SENSOR_DEVICE_ATTR(temp7_max, S_IRUGO, show_temp_max, NULL, 6);
353static SENSOR_DEVICE_ATTR(temp8_max, S_IRUGO, show_temp_max, NULL, 7);
354static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp_crit, NULL, 0);
355static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO, show_temp_crit, NULL, 1);
356static SENSOR_DEVICE_ATTR(temp3_crit, S_IRUGO, show_temp_crit, NULL, 2);
357static SENSOR_DEVICE_ATTR(temp4_crit, S_IRUGO, show_temp_crit, NULL, 3);
358static SENSOR_DEVICE_ATTR(temp5_crit, S_IRUGO, show_temp_crit, NULL, 4);
359static SENSOR_DEVICE_ATTR(temp6_crit, S_IRUGO, show_temp_crit, NULL, 5);
360static SENSOR_DEVICE_ATTR(temp7_crit, S_IRUGO, show_temp_crit, NULL, 6);
361static SENSOR_DEVICE_ATTR(temp8_crit, S_IRUGO, show_temp_crit, NULL, 7);
362
363static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0);
364static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1);
365static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, show_fan, NULL, 2);
366static SENSOR_DEVICE_ATTR(fan4_input, S_IRUGO, show_fan, NULL, 3);
367static SENSOR_DEVICE_ATTR(fan1_fault, S_IRUGO, show_fan_fault, NULL, 0);
368static SENSOR_DEVICE_ATTR(fan2_fault, S_IRUGO, show_fan_fault, NULL, 1);
369static SENSOR_DEVICE_ATTR(fan3_fault, S_IRUGO, show_fan_fault, NULL, 2);
370static SENSOR_DEVICE_ATTR(fan4_fault, S_IRUGO, show_fan_fault, NULL, 3);
371static SENSOR_DEVICE_ATTR(fan1_min, S_IRUGO, show_fan_min, NULL, 0);
372static SENSOR_DEVICE_ATTR(fan2_min, S_IRUGO, show_fan_min, NULL, 1);
373static SENSOR_DEVICE_ATTR(fan3_min, S_IRUGO, show_fan_min, NULL, 2);
374static SENSOR_DEVICE_ATTR(fan4_min, S_IRUGO, show_fan_min, NULL, 3);
375
376static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, show_in, NULL, 0);
377static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, show_in, NULL, 1);
378static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, show_in, NULL, 2);
379static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, show_in, NULL, 3);
380static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, show_in, NULL, 4);
381static SENSOR_DEVICE_ATTR(in0_label, S_IRUGO, show_in_label, NULL, 0);
382static SENSOR_DEVICE_ATTR(in1_label, S_IRUGO, show_in_label, NULL, 1);
383static SENSOR_DEVICE_ATTR(in2_label, S_IRUGO, show_in_label, NULL, 2);
384static SENSOR_DEVICE_ATTR(in3_label, S_IRUGO, show_in_label, NULL, 3);
385
386static 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
449static const struct attribute_group sch5627_group = {
450	.attrs = sch5627_attributes,
451};
452
453static 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
468static 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
587error:
588	sch5627_remove(pdev);
589	return err;
590}
591
592static struct platform_driver sch5627_driver = {
593	.driver = {
594		.name	= DRVNAME,
595	},
596	.probe		= sch5627_probe,
597	.remove		= sch5627_remove,
598};
599
600module_platform_driver(sch5627_driver);
601
602MODULE_DESCRIPTION("SMSC SCH5627 Hardware Monitoring Driver");
603MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
604MODULE_LICENSE("GPL");
605