aboutsummaryrefslogtreecommitdiff
path: root/drivers/mfd/aat2870-core.c
blob: 3aa36eb5c79bcf769616013cd3176ed04af500bc (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
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
/*
 * linux/drivers/mfd/aat2870-core.c
 *
 * Copyright (c) 2011, NVIDIA Corporation.
 * Author: Jin Park <jinyoungp@nvidia.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 * 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., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/debugfs.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/i2c.h>
#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/mfd/core.h>
#include <linux/mfd/aat2870.h>
#include <linux/regulator/machine.h>

static struct aat2870_register aat2870_regs[AAT2870_REG_NUM] = {
	/* readable, writeable, value */
	{ 0, 1, 0x00 },	/* 0x00 AAT2870_BL_CH_EN */
	{ 0, 1, 0x16 },	/* 0x01 AAT2870_BLM */
	{ 0, 1, 0x16 },	/* 0x02 AAT2870_BLS */
	{ 0, 1, 0x56 },	/* 0x03 AAT2870_BL1 */
	{ 0, 1, 0x56 },	/* 0x04 AAT2870_BL2 */
	{ 0, 1, 0x56 },	/* 0x05 AAT2870_BL3 */
	{ 0, 1, 0x56 },	/* 0x06 AAT2870_BL4 */
	{ 0, 1, 0x56 },	/* 0x07 AAT2870_BL5 */
	{ 0, 1, 0x56 },	/* 0x08 AAT2870_BL6 */
	{ 0, 1, 0x56 },	/* 0x09 AAT2870_BL7 */
	{ 0, 1, 0x56 },	/* 0x0A AAT2870_BL8 */
	{ 0, 1, 0x00 },	/* 0x0B AAT2870_FLR */
	{ 0, 1, 0x03 },	/* 0x0C AAT2870_FM */
	{ 0, 1, 0x03 },	/* 0x0D AAT2870_FS */
	{ 0, 1, 0x10 },	/* 0x0E AAT2870_ALS_CFG0 */
	{ 0, 1, 0x06 },	/* 0x0F AAT2870_ALS_CFG1 */
	{ 0, 1, 0x00 },	/* 0x10 AAT2870_ALS_CFG2 */
	{ 1, 0, 0x00 },	/* 0x11 AAT2870_AMB */
	{ 0, 1, 0x00 },	/* 0x12 AAT2870_ALS0 */
	{ 0, 1, 0x00 },	/* 0x13 AAT2870_ALS1 */
	{ 0, 1, 0x00 },	/* 0x14 AAT2870_ALS2 */
	{ 0, 1, 0x00 },	/* 0x15 AAT2870_ALS3 */
	{ 0, 1, 0x00 },	/* 0x16 AAT2870_ALS4 */
	{ 0, 1, 0x00 },	/* 0x17 AAT2870_ALS5 */
	{ 0, 1, 0x00 },	/* 0x18 AAT2870_ALS6 */
	{ 0, 1, 0x00 },	/* 0x19 AAT2870_ALS7 */
	{ 0, 1, 0x00 },	/* 0x1A AAT2870_ALS8 */
	{ 0, 1, 0x00 },	/* 0x1B AAT2870_ALS9 */
	{ 0, 1, 0x00 },	/* 0x1C AAT2870_ALSA */
	{ 0, 1, 0x00 },	/* 0x1D AAT2870_ALSB */
	{ 0, 1, 0x00 },	/* 0x1E AAT2870_ALSC */
	{ 0, 1, 0x00 },	/* 0x1F AAT2870_ALSD */
	{ 0, 1, 0x00 },	/* 0x20 AAT2870_ALSE */
	{ 0, 1, 0x00 },	/* 0x21 AAT2870_ALSF */
	{ 0, 1, 0x00 },	/* 0x22 AAT2870_SUB_SET */
	{ 0, 1, 0x00 },	/* 0x23 AAT2870_SUB_CTRL */
	{ 0, 1, 0x00 },	/* 0x24 AAT2870_LDO_AB */
	{ 0, 1, 0x00 },	/* 0x25 AAT2870_LDO_CD */
	{ 0, 1, 0x00 },	/* 0x26 AAT2870_LDO_EN */
};

static struct mfd_cell aat2870_devs[] = {
	{
		.name = "aat2870-backlight",
		.id = AAT2870_ID_BL,
		.pdata_size = sizeof(struct aat2870_bl_platform_data),
	},
	{
		.name = "aat2870-regulator",
		.id = AAT2870_ID_LDOA,
		.pdata_size = sizeof(struct regulator_init_data),
	},
	{
		.name = "aat2870-regulator",
		.id = AAT2870_ID_LDOB,
		.pdata_size = sizeof(struct regulator_init_data),
	},
	{
		.name = "aat2870-regulator",
		.id = AAT2870_ID_LDOC,
		.pdata_size = sizeof(struct regulator_init_data),
	},
	{
		.name = "aat2870-regulator",
		.id = AAT2870_ID_LDOD,
		.pdata_size = sizeof(struct regulator_init_data),
	},
};

static int __aat2870_read(struct aat2870_data *aat2870, u8 addr, u8 *val)
{
	int ret;

	if (addr >= AAT2870_REG_NUM) {
		dev_err(aat2870->dev, "Invalid address, 0x%02x\n", addr);
		return -EINVAL;
	}

	if (!aat2870->reg_cache[addr].readable) {
		*val = aat2870->reg_cache[addr].value;
		goto out;
	}

	ret = i2c_master_send(aat2870->client, &addr, 1);
	if (ret < 0)
		return ret;
	if (ret != 1)
		return -EIO;

	ret = i2c_master_recv(aat2870->client, val, 1);
	if (ret < 0)
		return ret;
	if (ret != 1)
		return -EIO;

out:
	dev_dbg(aat2870->dev, "read: addr=0x%02x, val=0x%02x\n", addr, *val);
	return 0;
}

static int __aat2870_write(struct aat2870_data *aat2870, u8 addr, u8 val)
{
	u8 msg[2];
	int ret;

	if (addr >= AAT2870_REG_NUM) {
		dev_err(aat2870->dev, "Invalid address, 0x%02x\n", addr);
		return -EINVAL;
	}

	if (!aat2870->reg_cache[addr].writeable) {
		dev_err(aat2870->dev, "Address 0x%02x is not writeable\n",
			addr);
		return -EINVAL;
	}

	msg[0] = addr;
	msg[1] = val;
	ret = i2c_master_send(aat2870->client, msg, 2);
	if (ret < 0)
		return ret;
	if (ret != 2)
		return -EIO;

	aat2870->reg_cache[addr].value = val;

	dev_dbg(aat2870->dev, "write: addr=0x%02x, val=0x%02x\n", addr, val);
	return 0;
}

static int aat2870_read(struct aat2870_data *aat2870, u8 addr, u8 *val)
{
	int ret;

	mutex_lock(&aat2870->io_lock);
	ret = __aat2870_read(aat2870, addr, val);
	mutex_unlock(&aat2870->io_lock);

	return ret;
}

static int aat2870_write(struct aat2870_data *aat2870, u8 addr, u8 val)
{
	int ret;

	mutex_lock(&aat2870->io_lock);
	ret = __aat2870_write(aat2870, addr, val);
	mutex_unlock(&aat2870->io_lock);

	return ret;
}

static int aat2870_update(struct aat2870_data *aat2870, u8 addr, u8 mask,
			  u8 val)
{
	int change;
	u8 old_val, new_val;
	int ret;

	mutex_lock(&aat2870->io_lock);

	ret = __aat2870_read(aat2870, addr, &old_val);
	if (ret)
		goto out_unlock;

	new_val = (old_val & ~mask) | (val & mask);
	change = old_val != new_val;
	if (change)
		ret = __aat2870_write(aat2870, addr, new_val);

out_unlock:
	mutex_unlock(&aat2870->io_lock);

	return ret;
}

static inline void aat2870_enable(struct aat2870_data *aat2870)
{
	if (aat2870->en_pin >= 0)
		gpio_set_value(aat2870->en_pin, 1);

	aat2870->is_enable = 1;
}

static inline void aat2870_disable(struct aat2870_data *aat2870)
{
	if (aat2870->en_pin >= 0)
		gpio_set_value(aat2870->en_pin, 0);

	aat2870->is_enable = 0;
}

#ifdef CONFIG_DEBUG_FS
static ssize_t aat2870_dump_reg(struct aat2870_data *aat2870, char *buf)
{
	u8 addr, val;
	ssize_t count = 0;
	int ret;

	count += sprintf(buf, "aat2870 registers\n");
	for (addr = 0; addr < AAT2870_REG_NUM; addr++) {
		count += sprintf(buf + count, "0x%02x: ", addr);
		if (count >= PAGE_SIZE - 1)
			break;

		ret = aat2870->read(aat2870, addr, &val);
		if (ret == 0)
			count += snprintf(buf + count, PAGE_SIZE - count,
					  "0x%02x", val);
		else
			count += snprintf(buf + count, PAGE_SIZE - count,
					  "<read fail: %d>", ret);

		if (count >= PAGE_SIZE - 1)
			break;

		count += snprintf(buf + count, PAGE_SIZE - count, "\n");
		if (count >= PAGE_SIZE - 1)
			break;
	}

	/* Truncate count; min() would cause a warning */
	if (count >= PAGE_SIZE)
		count = PAGE_SIZE - 1;

	return count;
}

static int aat2870_reg_open_file(struct inode *inode, struct file *file)
{
	file->private_data = inode->i_private;

	return 0;
}

static ssize_t aat2870_reg_read_file(struct file *file, char __user *user_buf,
				     size_t count, loff_t *ppos)
{
	struct aat2870_data *aat2870 = file->private_data;
	char *buf;
	ssize_t ret;

	buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
	if (!buf)
		return -ENOMEM;

	ret = aat2870_dump_reg(aat2870, buf);
	if (ret >= 0)
		ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);

	kfree(buf);

	return ret;
}

static ssize_t aat2870_reg_write_file(struct file *file,
				      const char __user *user_buf, size_t count,
				      loff_t *ppos)
{
	struct aat2870_data *aat2870 = file->private_data;
	char buf[32];
	ssize_t buf_size;
	char *start = buf;
	unsigned long addr, val;
	int ret;

	buf_size = min(count, (sizeof(buf)-1));
	if (copy_from_user(buf, user_buf, buf_size)) {
		dev_err(aat2870->dev, "Failed to copy from user\n");
		return -EFAULT;
	}
	buf[buf_size] = 0;

	while (*start == ' ')
		start++;

	addr = simple_strtoul(start, &start, 16);
	if (addr >= AAT2870_REG_NUM) {
		dev_err(aat2870->dev, "Invalid address, 0x%lx\n", addr);
		return -EINVAL;
	}

	while (*start == ' ')
		start++;

	if (strict_strtoul(start, 16, &val))
		return -EINVAL;

	ret = aat2870->write(aat2870, (u8)addr, (u8)val);
	if (ret)
		return ret;

	return buf_size;
}

static const struct file_operations aat2870_reg_fops = {
	.open = aat2870_reg_open_file,
	.read = aat2870_reg_read_file,
	.write = aat2870_reg_write_file,
};

static void aat2870_init_debugfs(struct aat2870_data *aat2870)
{
	aat2870->dentry_root = debugfs_create_dir("aat2870", NULL);
	if (!aat2870->dentry_root) {
		dev_warn(aat2870->dev,
			 "Failed to create debugfs root directory\n");
		return;
	}

	aat2870->dentry_reg = debugfs_create_file("regs", 0644,
						  aat2870->dentry_root,
						  aat2870, &aat2870_reg_fops);
	if (!aat2870->dentry_reg)
		dev_warn(aat2870->dev,
			 "Failed to create debugfs register file\n");
}

static void aat2870_uninit_debugfs(struct aat2870_data *aat2870)
{
	debugfs_remove_recursive(aat2870->dentry_root);
}
#else
static inline void aat2870_init_debugfs(struct aat2870_data *aat2870)
{
}

static inline void aat2870_uninit_debugfs(struct aat2870_data *aat2870)
{
}
#endif /* CONFIG_DEBUG_FS */

static int aat2870_i2c_probe(struct i2c_client *client,
			     const struct i2c_device_id *id)
{
	struct aat2870_platform_data *pdata = client->dev.platform_data;
	struct aat2870_data *aat2870;
	int i, j;
	int ret = 0;

	aat2870 = kzalloc(sizeof(struct aat2870_data), GFP_KERNEL);
	if (!aat2870) {
		dev_err(&client->dev,
			"Failed to allocate memory for aat2870\n");
		ret = -ENOMEM;
		goto out;
	}

	aat2870->dev = &client->dev;
	dev_set_drvdata(aat2870->dev, aat2870);

	aat2870->client = client;
	i2c_set_clientdata(client, aat2870);

	aat2870->reg_cache = aat2870_regs;

	if (pdata->en_pin < 0)
		aat2870->en_pin = -1;
	else
		aat2870->en_pin = pdata->en_pin;

	aat2870->init = pdata->init;
	aat2870->uninit = pdata->uninit;
	aat2870->read = aat2870_read;
	aat2870->write = aat2870_write;
	aat2870->update = aat2870_update;

	mutex_init(&aat2870->io_lock);

	if (aat2870->init)
		aat2870->init(aat2870);

	if (aat2870->en_pin >= 0) {
		ret = gpio_request_one(aat2870->en_pin, GPIOF_OUT_INIT_HIGH,
				       "aat2870-en");
		if (ret < 0) {
			dev_err(&client->dev,
				"Failed to request GPIO %d\n", aat2870->en_pin);
			goto out_kfree;
		}
	}

	aat2870_enable(aat2870);

	for (i = 0; i < pdata->num_subdevs; i++) {
		for (j = 0; j < ARRAY_SIZE(aat2870_devs); j++) {
			if ((pdata->subdevs[i].id == aat2870_devs[j].id) &&
					!strcmp(pdata->subdevs[i].name,
						aat2870_devs[j].name)) {
				aat2870_devs[j].platform_data =
					pdata->subdevs[i].platform_data;
				break;
			}
		}
	}

	ret = mfd_add_devices(aat2870->dev, 0, aat2870_devs,
			      ARRAY_SIZE(aat2870_devs), NULL, 0);
	if (ret != 0) {
		dev_err(aat2870->dev, "Failed to add subdev: %d\n", ret);
		goto out_disable;
	}

	aat2870_init_debugfs(aat2870);

	return 0;

out_disable:
	aat2870_disable(aat2870);
	if (aat2870->en_pin >= 0)
		gpio_free(aat2870->en_pin);
out_kfree:
	kfree(aat2870);
out:
	return ret;
}

static int aat2870_i2c_remove(struct i2c_client *client)
{
	struct aat2870_data *aat2870 = i2c_get_clientdata(client);

	aat2870_uninit_debugfs(aat2870);

	mfd_remove_devices(aat2870->dev);
	aat2870_disable(aat2870);
	if (aat2870->en_pin >= 0)
		gpio_free(aat2870->en_pin);
	if (aat2870->uninit)
		aat2870->uninit(aat2870);
	kfree(aat2870);

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int aat2870_i2c_suspend(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct aat2870_data *aat2870 = i2c_get_clientdata(client);

	aat2870_disable(aat2870);

	return 0;
}

static int aat2870_i2c_resume(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct aat2870_data *aat2870 = i2c_get_clientdata(client);
	struct aat2870_register *reg = NULL;
	int i;

	aat2870_enable(aat2870);

	/* restore registers */
	for (i = 0; i < AAT2870_REG_NUM; i++) {
		reg = &aat2870->reg_cache[i];
		if (reg->writeable)
			aat2870->write(aat2870, i, reg->value);
	}

	return 0;
}
#endif /* CONFIG_PM_SLEEP */

static SIMPLE_DEV_PM_OPS(aat2870_pm_ops, aat2870_i2c_suspend,
			 aat2870_i2c_resume);

static const struct i2c_device_id aat2870_i2c_id_table[] = {
	{ "aat2870", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, aat2870_i2c_id_table);

static struct i2c_driver aat2870_i2c_driver = {
	.driver = {
		.name	= "aat2870",
		.owner	= THIS_MODULE,
		.pm	= &aat2870_pm_ops,
	},
	.probe		= aat2870_i2c_probe,
	.remove		= aat2870_i2c_remove,
	.id_table	= aat2870_i2c_id_table,
};

static int __init aat2870_init(void)
{
	return i2c_add_driver(&aat2870_i2c_driver);
}
subsys_initcall(aat2870_init);

static void __exit aat2870_exit(void)
{
	i2c_del_driver(&aat2870_i2c_driver);
}
module_exit(aat2870_exit);

MODULE_DESCRIPTION("Core support for the AnalogicTech AAT2870");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jin Park <jinyoungp@nvidia.com>");