aboutsummaryrefslogtreecommitdiff
path: root/drivers/misc/ics932s401.c
blob: 0f9ea75b0b18976d0807e05c95c342639e2bf55d (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
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * A driver for the Integrated Circuits ICS932S401
 * Copyright (C) 2008 IBM
 *
 * Author: Darrick J. Wong <darrick.wong@oracle.com>
 */

#include <linux/module.h>
#include <linux/jiffies.h>
#include <linux/i2c.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/delay.h>
#include <linux/log2.h>
#include <linux/slab.h>

/* Addresses to scan */
static const unsigned short normal_i2c[] = { 0x69, I2C_CLIENT_END };

/* ICS932S401 registers */
#define ICS932S401_REG_CFG2			0x01
#define		ICS932S401_CFG1_SPREAD		0x01
#define ICS932S401_REG_CFG7			0x06
#define		ICS932S401_FS_MASK		0x07
#define	ICS932S401_REG_VENDOR_REV		0x07
#define		ICS932S401_VENDOR		1
#define		ICS932S401_VENDOR_MASK		0x0F
#define		ICS932S401_REV			4
#define		ICS932S401_REV_SHIFT		4
#define ICS932S401_REG_DEVICE			0x09
#define		ICS932S401_DEVICE		11
#define	ICS932S401_REG_CTRL			0x0A
#define		ICS932S401_MN_ENABLED		0x80
#define		ICS932S401_CPU_ALT		0x04
#define		ICS932S401_SRC_ALT		0x08
#define ICS932S401_REG_CPU_M_CTRL		0x0B
#define		ICS932S401_M_MASK		0x3F
#define	ICS932S401_REG_CPU_N_CTRL		0x0C
#define	ICS932S401_REG_CPU_SPREAD1		0x0D
#define ICS932S401_REG_CPU_SPREAD2		0x0E
#define		ICS932S401_SPREAD_MASK		0x7FFF
#define ICS932S401_REG_SRC_M_CTRL		0x0F
#define ICS932S401_REG_SRC_N_CTRL		0x10
#define	ICS932S401_REG_SRC_SPREAD1		0x11
#define ICS932S401_REG_SRC_SPREAD2		0x12
#define ICS932S401_REG_CPU_DIVISOR		0x13
#define		ICS932S401_CPU_DIVISOR_SHIFT	4
#define ICS932S401_REG_PCISRC_DIVISOR		0x14
#define		ICS932S401_SRC_DIVISOR_MASK	0x0F
#define		ICS932S401_PCI_DIVISOR_SHIFT	4

/* Base clock is 14.318MHz */
#define BASE_CLOCK				14318

#define NUM_REGS				21
#define NUM_MIRRORED_REGS			15

static int regs_to_copy[NUM_MIRRORED_REGS] = {
	ICS932S401_REG_CFG2,
	ICS932S401_REG_CFG7,
	ICS932S401_REG_VENDOR_REV,
	ICS932S401_REG_DEVICE,
	ICS932S401_REG_CTRL,
	ICS932S401_REG_CPU_M_CTRL,
	ICS932S401_REG_CPU_N_CTRL,
	ICS932S401_REG_CPU_SPREAD1,
	ICS932S401_REG_CPU_SPREAD2,
	ICS932S401_REG_SRC_M_CTRL,
	ICS932S401_REG_SRC_N_CTRL,
	ICS932S401_REG_SRC_SPREAD1,
	ICS932S401_REG_SRC_SPREAD2,
	ICS932S401_REG_CPU_DIVISOR,
	ICS932S401_REG_PCISRC_DIVISOR,
};

/* How often do we reread sensors values? (In jiffies) */
#define SENSOR_REFRESH_INTERVAL	(2 * HZ)

/* How often do we reread sensor limit values? (In jiffies) */
#define LIMIT_REFRESH_INTERVAL	(60 * HZ)

struct ics932s401_data {
	struct attribute_group	attrs;
	struct mutex		lock;
	char			sensors_valid;
	unsigned long		sensors_last_updated;	/* In jiffies */

	u8			regs[NUM_REGS];
};

static int ics932s401_probe(struct i2c_client *client,
			 const struct i2c_device_id *id);
static int ics932s401_detect(struct i2c_client *client,
			  struct i2c_board_info *info);
static int ics932s401_remove(struct i2c_client *client);

static const struct i2c_device_id ics932s401_id[] = {
	{ "ics932s401", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, ics932s401_id);

static struct i2c_driver ics932s401_driver = {
	.class		= I2C_CLASS_HWMON,
	.driver = {
		.name	= "ics932s401",
	},
	.probe		= ics932s401_probe,
	.remove		= ics932s401_remove,
	.id_table	= ics932s401_id,
	.detect		= ics932s401_detect,
	.address_list	= normal_i2c,
};

static struct ics932s401_data *ics932s401_update_device(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct ics932s401_data *data = i2c_get_clientdata(client);
	unsigned long local_jiffies = jiffies;
	int i, temp;

	mutex_lock(&data->lock);
	if (time_before(local_jiffies, data->sensors_last_updated +
		SENSOR_REFRESH_INTERVAL)
		&& data->sensors_valid)
		goto out;

	/*
	 * Each register must be read as a word and then right shifted 8 bits.
	 * Not really sure why this is; setting the "byte count programming"
	 * register to 1 does not fix this problem.
	 */
	for (i = 0; i < NUM_MIRRORED_REGS; i++) {
		temp = i2c_smbus_read_word_data(client, regs_to_copy[i]);
		if (temp < 0)
			temp = 0;
		data->regs[regs_to_copy[i]] = temp >> 8;
	}

	data->sensors_last_updated = local_jiffies;
	data->sensors_valid = 1;

out:
	mutex_unlock(&data->lock);
	return data;
}

static ssize_t show_spread_enabled(struct device *dev,
				   struct device_attribute *devattr,
				   char *buf)
{
	struct ics932s401_data *data = ics932s401_update_device(dev);

	if (data->regs[ICS932S401_REG_CFG2] & ICS932S401_CFG1_SPREAD)
		return sprintf(buf, "1\n");

	return sprintf(buf, "0\n");
}

/* bit to cpu khz map */
static const int fs_speeds[] = {
	266666,
	133333,
	200000,
	166666,
	333333,
	100000,
	400000,
	0,
};

/* clock divisor map */
static const int divisors[] = {2, 3, 5, 15, 4, 6, 10, 30, 8, 12, 20, 60, 16,
			       24, 40, 120};

/* Calculate CPU frequency from the M/N registers. */
static int calculate_cpu_freq(struct ics932s401_data *data)
{
	int m, n, freq;

	m = data->regs[ICS932S401_REG_CPU_M_CTRL] & ICS932S401_M_MASK;
	n = data->regs[ICS932S401_REG_CPU_N_CTRL];

	/* Pull in bits 8 & 9 from the M register */
	n |= ((int)data->regs[ICS932S401_REG_CPU_M_CTRL] & 0x80) << 1;
	n |= ((int)data->regs[ICS932S401_REG_CPU_M_CTRL] & 0x40) << 3;

	freq = BASE_CLOCK * (n + 8) / (m + 2);
	freq /= divisors[data->regs[ICS932S401_REG_CPU_DIVISOR] >>
			 ICS932S401_CPU_DIVISOR_SHIFT];

	return freq;
}

static ssize_t show_cpu_clock(struct device *dev,
			      struct device_attribute *devattr,
			      char *buf)
{
	struct ics932s401_data *data = ics932s401_update_device(dev);

	return sprintf(buf, "%d\n", calculate_cpu_freq(data));
}

static ssize_t show_cpu_clock_sel(struct device *dev,
				  struct device_attribute *devattr,
				  char *buf)
{
	struct ics932s401_data *data = ics932s401_update_device(dev);
	int freq;

	if (data->regs[ICS932S401_REG_CTRL] & ICS932S401_MN_ENABLED)
		freq = calculate_cpu_freq(data);
	else {
		/* Freq is neatly wrapped up for us */
		int fid = data->regs[ICS932S401_REG_CFG7] & ICS932S401_FS_MASK;

		freq = fs_speeds[fid];
		if (data->regs[ICS932S401_REG_CTRL] & ICS932S401_CPU_ALT) {
			switch (freq) {
			case 166666:
				freq = 160000;
				break;
			case 333333:
				freq = 320000;
				break;
			}
		}
	}

	return sprintf(buf, "%d\n", freq);
}

/* Calculate SRC frequency from the M/N registers. */
static int calculate_src_freq(struct ics932s401_data *data)
{
	int m, n, freq;

	m = data->regs[ICS932S401_REG_SRC_M_CTRL] & ICS932S401_M_MASK;
	n = data->regs[ICS932S401_REG_SRC_N_CTRL];

	/* Pull in bits 8 & 9 from the M register */
	n |= ((int)data->regs[ICS932S401_REG_SRC_M_CTRL] & 0x80) << 1;
	n |= ((int)data->regs[ICS932S401_REG_SRC_M_CTRL] & 0x40) << 3;

	freq = BASE_CLOCK * (n + 8) / (m + 2);
	freq /= divisors[data->regs[ICS932S401_REG_PCISRC_DIVISOR] &
			 ICS932S401_SRC_DIVISOR_MASK];

	return freq;
}

static ssize_t show_src_clock(struct device *dev,
			      struct device_attribute *devattr,
			      char *buf)
{
	struct ics932s401_data *data = ics932s401_update_device(dev);

	return sprintf(buf, "%d\n", calculate_src_freq(data));
}

static ssize_t show_src_clock_sel(struct device *dev,
				  struct device_attribute *devattr,
				  char *buf)
{
	struct ics932s401_data *data = ics932s401_update_device(dev);
	int freq;

	if (data->regs[ICS932S401_REG_CTRL] & ICS932S401_MN_ENABLED)
		freq = calculate_src_freq(data);
	else
		/* Freq is neatly wrapped up for us */
		if (data->regs[ICS932S401_REG_CTRL] & ICS932S401_CPU_ALT &&
		    data->regs[ICS932S401_REG_CTRL] & ICS932S401_SRC_ALT)
			freq = 96000;
		else
			freq = 100000;

	return sprintf(buf, "%d\n", freq);
}

/* Calculate PCI frequency from the SRC M/N registers. */
static int calculate_pci_freq(struct ics932s401_data *data)
{
	int m, n, freq;

	m = data->regs[ICS932S401_REG_SRC_M_CTRL] & ICS932S401_M_MASK;
	n = data->regs[ICS932S401_REG_SRC_N_CTRL];

	/* Pull in bits 8 & 9 from the M register */
	n |= ((int)data->regs[ICS932S401_REG_SRC_M_CTRL] & 0x80) << 1;
	n |= ((int)data->regs[ICS932S401_REG_SRC_M_CTRL] & 0x40) << 3;

	freq = BASE_CLOCK * (n + 8) / (m + 2);
	freq /= divisors[data->regs[ICS932S401_REG_PCISRC_DIVISOR] >>
			 ICS932S401_PCI_DIVISOR_SHIFT];

	return freq;
}

static ssize_t show_pci_clock(struct device *dev,
			      struct device_attribute *devattr,
			      char *buf)
{
	struct ics932s401_data *data = ics932s401_update_device(dev);

	return sprintf(buf, "%d\n", calculate_pci_freq(data));
}

static ssize_t show_pci_clock_sel(struct device *dev,
				  struct device_attribute *devattr,
				  char *buf)
{
	struct ics932s401_data *data = ics932s401_update_device(dev);
	int freq;

	if (data->regs[ICS932S401_REG_CTRL] & ICS932S401_MN_ENABLED)
		freq = calculate_pci_freq(data);
	else
		freq = 33333;

	return sprintf(buf, "%d\n", freq);
}

static ssize_t show_value(struct device *dev,
			  struct device_attribute *devattr,
			  char *buf);

static ssize_t show_spread(struct device *dev,
			   struct device_attribute *devattr,
			   char *buf);

static DEVICE_ATTR(spread_enabled, S_IRUGO, show_spread_enabled, NULL);
static DEVICE_ATTR(cpu_clock_selection, S_IRUGO, show_cpu_clock_sel, NULL);
static DEVICE_ATTR(cpu_clock, S_IRUGO, show_cpu_clock, NULL);
static DEVICE_ATTR(src_clock_selection, S_IRUGO, show_src_clock_sel, NULL);
static DEVICE_ATTR(src_clock, S_IRUGO, show_src_clock, NULL);
static DEVICE_ATTR(pci_clock_selection, S_IRUGO, show_pci_clock_sel, NULL);
static DEVICE_ATTR(pci_clock, S_IRUGO, show_pci_clock, NULL);
static DEVICE_ATTR(usb_clock, S_IRUGO, show_value, NULL);
static DEVICE_ATTR(ref_clock, S_IRUGO, show_value, NULL);
static DEVICE_ATTR(cpu_spread, S_IRUGO, show_spread, NULL);
static DEVICE_ATTR(src_spread, S_IRUGO, show_spread, NULL);

static struct attribute *ics932s401_attr[] = {
	&dev_attr_spread_enabled.attr,
	&dev_attr_cpu_clock_selection.attr,
	&dev_attr_cpu_clock.attr,
	&dev_attr_src_clock_selection.attr,
	&dev_attr_src_clock.attr,
	&dev_attr_pci_clock_selection.attr,
	&dev_attr_pci_clock.attr,
	&dev_attr_usb_clock.attr,
	&dev_attr_ref_clock.attr,
	&dev_attr_cpu_spread.attr,
	&dev_attr_src_spread.attr,
	NULL
};

static ssize_t show_value(struct device *dev,
			  struct device_attribute *devattr,
			  char *buf)
{
	int x;

	if (devattr == &dev_attr_usb_clock)
		x = 48000;
	else if (devattr == &dev_attr_ref_clock)
		x = BASE_CLOCK;
	else
		BUG();

	return sprintf(buf, "%d\n", x);
}

static ssize_t show_spread(struct device *dev,
			   struct device_attribute *devattr,
			   char *buf)
{
	struct ics932s401_data *data = ics932s401_update_device(dev);
	int reg;
	unsigned long val;

	if (!(data->regs[ICS932S401_REG_CFG2] & ICS932S401_CFG1_SPREAD))
		return sprintf(buf, "0%%\n");

	if (devattr == &dev_attr_src_spread)
		reg = ICS932S401_REG_SRC_SPREAD1;
	else if (devattr == &dev_attr_cpu_spread)
		reg = ICS932S401_REG_CPU_SPREAD1;
	else
		BUG();

	val = data->regs[reg] | (data->regs[reg + 1] << 8);
	val &= ICS932S401_SPREAD_MASK;

	/* Scale 0..2^14 to -0.5. */
	val = 500000 * val / 16384;
	return sprintf(buf, "-0.%lu%%\n", val);
}

/* Return 0 if detection is successful, -ENODEV otherwise */
static int ics932s401_detect(struct i2c_client *client,
			  struct i2c_board_info *info)
{
	struct i2c_adapter *adapter = client->adapter;
	int vendor, device, revision;

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
		return -ENODEV;

	vendor = i2c_smbus_read_word_data(client, ICS932S401_REG_VENDOR_REV);
	vendor >>= 8;
	revision = vendor >> ICS932S401_REV_SHIFT;
	vendor &= ICS932S401_VENDOR_MASK;
	if (vendor != ICS932S401_VENDOR)
		return -ENODEV;

	device = i2c_smbus_read_word_data(client, ICS932S401_REG_DEVICE);
	device >>= 8;
	if (device != ICS932S401_DEVICE)
		return -ENODEV;

	if (revision != ICS932S401_REV)
		dev_info(&adapter->dev, "Unknown revision %d\n", revision);

	strlcpy(info->type, "ics932s401", I2C_NAME_SIZE);

	return 0;
}

static int ics932s401_probe(struct i2c_client *client,
			 const struct i2c_device_id *id)
{
	struct ics932s401_data *data;
	int err;

	data = kzalloc(sizeof(struct ics932s401_data), GFP_KERNEL);
	if (!data) {
		err = -ENOMEM;
		goto exit;
	}

	i2c_set_clientdata(client, data);
	mutex_init(&data->lock);

	dev_info(&client->dev, "%s chip found\n", client->name);

	/* Register sysfs hooks */
	data->attrs.attrs = ics932s401_attr;
	err = sysfs_create_group(&client->dev.kobj, &data->attrs);
	if (err)
		goto exit_free;

	return 0;

exit_free:
	kfree(data);
exit:
	return err;
}

static int ics932s401_remove(struct i2c_client *client)
{
	struct ics932s401_data *data = i2c_get_clientdata(client);

	sysfs_remove_group(&client->dev.kobj, &data->attrs);
	kfree(data);
	return 0;
}

module_i2c_driver(ics932s401_driver);

MODULE_AUTHOR("Darrick J. Wong <darrick.wong@oracle.com>");
MODULE_DESCRIPTION("ICS932S401 driver");
MODULE_LICENSE("GPL");

/* IBM IntelliStation Z30 */
MODULE_ALIAS("dmi:bvnIBM:*:rn9228:*");
MODULE_ALIAS("dmi:bvnIBM:*:rn9232:*");

/* IBM x3650/x3550 */
MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3650*");
MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3550*");