aboutsummaryrefslogtreecommitdiff
path: root/drivers/hwmon/smsc47b397.c
blob: 9100a2748850b854d389e1e6a46932174c1ebc5b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
/*
 * smsc47b397.c - Part of lm_sensors, Linux kernel modules
 * for hardware monitoring
 *
 * Supports the SMSC LPC47B397-NC Super-I/O chip.
 *
 * Author/Maintainer: Mark M. Hoffman <mhoffman@lightlink.com>
 * Copyright (C) 2004 Utilitek Systems, Inc.
 *
 * derived in part from smsc47m1.c:
 * Copyright (C) 2002 Mark D. Studebaker <mdsxyz123@yahoo.com>
 * Copyright (C) 2004 Jean Delvare <khali@linux-fr.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/ioport.h>
#include <linux/jiffies.h>
#include <linux/platform_device.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/mutex.h>
#include <linux/acpi.h>
#include <linux/io.h>

static unsigned short force_id;
module_param(force_id, ushort, 0);
MODULE_PARM_DESC(force_id, "Override the detected device ID");

static struct platform_device *pdev;

#define DRVNAME "smsc47b397"

/* Super-I/0 registers and commands */

#define	REG	0x2e	/* The register to read/write */
#define	VAL	0x2f	/* The value to read/write */

static inline void superio_outb(int reg, int val)
{
	outb(reg, REG);
	outb(val, VAL);
}

static inline int superio_inb(int reg)
{
	outb(reg, REG);
	return inb(VAL);
}

/* select superio logical device */
static inline void superio_select(int ld)
{
	superio_outb(0x07, ld);
}

static inline void superio_enter(void)
{
	outb(0x55, REG);
}

static inline void superio_exit(void)
{
	outb(0xAA, REG);
}

#define SUPERIO_REG_DEVID	0x20
#define SUPERIO_REG_DEVREV	0x21
#define SUPERIO_REG_BASE_MSB	0x60
#define SUPERIO_REG_BASE_LSB	0x61
#define SUPERIO_REG_LD8		0x08

#define SMSC_EXTENT		0x02

/* 0 <= nr <= 3 */
static u8 smsc47b397_reg_temp[] = {0x25, 0x26, 0x27, 0x80};
#define SMSC47B397_REG_TEMP(nr)	(smsc47b397_reg_temp[(nr)])

/* 0 <= nr <= 3 */
#define SMSC47B397_REG_FAN_LSB(nr) (0x28 + 2 * (nr))
#define SMSC47B397_REG_FAN_MSB(nr) (0x29 + 2 * (nr))

struct smsc47b397_data {
	unsigned short addr;
	const char *name;
	struct device *hwmon_dev;
	struct mutex lock;

	struct mutex update_lock;
	unsigned long last_updated; /* in jiffies */
	int valid;

	/* register values */
	u16 fan[4];
	u8 temp[4];
};

static int smsc47b397_read_value(struct smsc47b397_data *data, u8 reg)
{
	int res;

	mutex_lock(&data->lock);
	outb(reg, data->addr);
	res = inb_p(data->addr + 1);
	mutex_unlock(&data->lock);
	return res;
}

static struct smsc47b397_data *smsc47b397_update_device(struct device *dev)
{
	struct smsc47b397_data *data = dev_get_drvdata(dev);
	int i;

	mutex_lock(&data->update_lock);

	if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
		dev_dbg(dev, "starting device update...\n");

		/* 4 temperature inputs, 4 fan inputs */
		for (i = 0; i < 4; i++) {
			data->temp[i] = smsc47b397_read_value(data,
					SMSC47B397_REG_TEMP(i));

			/* must read LSB first */
			data->fan[i]  = smsc47b397_read_value(data,
					SMSC47B397_REG_FAN_LSB(i));
			data->fan[i] |= smsc47b397_read_value(data,
					SMSC47B397_REG_FAN_MSB(i)) << 8;
		}

		data->last_updated = jiffies;
		data->valid = 1;

		dev_dbg(dev, "... device update complete\n");
	}

	mutex_unlock(&data->update_lock);

	return data;
}

/*
 * TEMP: 0.001C/bit (-128C to +127C)
 * REG: 1C/bit, two's complement
 */
static int temp_from_reg(u8 reg)
{
	return (s8)reg * 1000;
}

static ssize_t show_temp(struct device *dev, struct device_attribute
			 *devattr, char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct smsc47b397_data *data = smsc47b397_update_device(dev);
	return sprintf(buf, "%d\n", temp_from_reg(data->temp[attr->index]));
}

static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3);

/*
 * FAN: 1 RPM/bit
 * REG: count of 90kHz pulses / revolution
 */
static int fan_from_reg(u16 reg)
{
	if (reg == 0 || reg == 0xffff)
		return 0;
	return 90000 * 60 / reg;
}

static ssize_t show_fan(struct device *dev, struct device_attribute
			*devattr, char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct smsc47b397_data *data = smsc47b397_update_device(dev);
	return sprintf(buf, "%d\n", fan_from_reg(data->fan[attr->index]));
}
static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0);
static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1);
static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, show_fan, NULL, 2);
static SENSOR_DEVICE_ATTR(fan4_input, S_IRUGO, show_fan, NULL, 3);

static ssize_t show_name(struct device *dev, struct device_attribute
			 *devattr, char *buf)
{
	struct smsc47b397_data *data = dev_get_drvdata(dev);
	return sprintf(buf, "%s\n", data->name);
}
static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);

static struct attribute *smsc47b397_attributes[] = {
	&sensor_dev_attr_temp1_input.dev_attr.attr,
	&sensor_dev_attr_temp2_input.dev_attr.attr,
	&sensor_dev_attr_temp3_input.dev_attr.attr,
	&sensor_dev_attr_temp4_input.dev_attr.attr,
	&sensor_dev_attr_fan1_input.dev_attr.attr,
	&sensor_dev_attr_fan2_input.dev_attr.attr,
	&sensor_dev_attr_fan3_input.dev_attr.attr,
	&sensor_dev_attr_fan4_input.dev_attr.attr,

	&dev_attr_name.attr,
	NULL
};

static const struct attribute_group smsc47b397_group = {
	.attrs = smsc47b397_attributes,
};

static int __devexit smsc47b397_remove(struct platform_device *pdev)
{
	struct smsc47b397_data *data = platform_get_drvdata(pdev);

	hwmon_device_unregister(data->hwmon_dev);
	sysfs_remove_group(&pdev->dev.kobj, &smsc47b397_group);

	return 0;
}

static int smsc47b397_probe(struct platform_device *pdev);

static struct platform_driver smsc47b397_driver = {
	.driver = {
		.owner	= THIS_MODULE,
		.name	= DRVNAME,
	},
	.probe		= smsc47b397_probe,
	.remove		= smsc47b397_remove,
};

static int smsc47b397_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct smsc47b397_data *data;
	struct resource *res;
	int err = 0;

	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
	if (!devm_request_region(dev, res->start, SMSC_EXTENT,
				 smsc47b397_driver.driver.name)) {
		dev_err(dev, "Region 0x%lx-0x%lx already in use!\n",
			(unsigned long)res->start,
			(unsigned long)res->start + SMSC_EXTENT - 1);
		return -EBUSY;
	}

	data = devm_kzalloc(dev, sizeof(struct smsc47b397_data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	data->addr = res->start;
	data->name = "smsc47b397";
	mutex_init(&data->lock);
	mutex_init(&data->update_lock);
	platform_set_drvdata(pdev, data);

	err = sysfs_create_group(&dev->kobj, &smsc47b397_group);
	if (err)
		return err;

	data->hwmon_dev = hwmon_device_register(dev);
	if (IS_ERR(data->hwmon_dev)) {
		err = PTR_ERR(data->hwmon_dev);
		goto error_remove;
	}

	return 0;

error_remove:
	sysfs_remove_group(&dev->kobj, &smsc47b397_group);
	return err;
}

static int __init smsc47b397_device_add(unsigned short address)
{
	struct resource res = {
		.start	= address,
		.end	= address + SMSC_EXTENT - 1,
		.name	= DRVNAME,
		.flags	= IORESOURCE_IO,
	};
	int err;

	err = acpi_check_resource_conflict(&res);
	if (err)
		goto exit;

	pdev = platform_device_alloc(DRVNAME, address);
	if (!pdev) {
		err = -ENOMEM;
		pr_err("Device allocation failed\n");
		goto exit;
	}

	err = platform_device_add_resources(pdev, &res, 1);
	if (err) {
		pr_err("Device resource addition failed (%d)\n", err);
		goto exit_device_put;
	}

	err = platform_device_add(pdev);
	if (err) {
		pr_err("Device addition failed (%d)\n", err);
		goto exit_device_put;
	}

	return 0;

exit_device_put:
	platform_device_put(pdev);
exit:
	return err;
}

static int __init smsc47b397_find(void)
{
	u8 id, rev;
	char *name;
	unsigned short addr;

	superio_enter();
	id = force_id ? force_id : superio_inb(SUPERIO_REG_DEVID);

	switch (id) {
	case 0x81:
		name = "SCH5307-NS";
		break;
	case 0x6f:
		name = "LPC47B397-NC";
		break;
	case 0x85:
	case 0x8c:
		name = "SCH5317";
		break;
	default:
		superio_exit();
		return -ENODEV;
	}

	rev = superio_inb(SUPERIO_REG_DEVREV);

	superio_select(SUPERIO_REG_LD8);
	addr = (superio_inb(SUPERIO_REG_BASE_MSB) << 8)
		 |  superio_inb(SUPERIO_REG_BASE_LSB);

	pr_info("found SMSC %s (base address 0x%04x, revision %u)\n",
		name, addr, rev);

	superio_exit();
	return addr;
}

static int __init smsc47b397_init(void)
{
	unsigned short address;
	int ret;

	ret = smsc47b397_find();
	if (ret < 0)
		return ret;
	address = ret;

	ret = platform_driver_register(&smsc47b397_driver);
	if (ret)
		goto exit;

	/* Sets global pdev as a side effect */
	ret = smsc47b397_device_add(address);
	if (ret)
		goto exit_driver;

	return 0;

exit_driver:
	platform_driver_unregister(&smsc47b397_driver);
exit:
	return ret;
}

static void __exit smsc47b397_exit(void)
{
	platform_device_unregister(pdev);
	platform_driver_unregister(&smsc47b397_driver);
}

MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
MODULE_DESCRIPTION("SMSC LPC47B397 driver");
MODULE_LICENSE("GPL");

module_init(smsc47b397_init);
module_exit(smsc47b397_exit);