aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/video/backlight/lms501kf03.c
blob: b43882abefaf3211a8555983d39a672208af6fa1 (plain) (blame)
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
/*
 * lms501kf03 TFT LCD panel driver.
 *
 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
 * Author: Jingoo Han  <jg1.han@samsung.com>
 *
 * 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.
 */

#include <linux/backlight.h>
#include <linux/delay.h>
#include <linux/fb.h>
#include <linux/gpio.h>
#include <linux/lcd.h>
#include <linux/module.h>
#include <linux/spi/spi.h>
#include <linux/wait.h>

#define COMMAND_ONLY		0x00
#define DATA_ONLY		0x01

struct lms501kf03 {
	struct device			*dev;
	struct spi_device		*spi;
	unsigned int			power;
	struct lcd_device		*ld;
	struct lcd_platform_data	*lcd_pd;
};

static const unsigned char seq_password[] = {
	0xb9, 0xff, 0x83, 0x69,
};

static const unsigned char seq_power[] = {
	0xb1, 0x01, 0x00, 0x34, 0x06, 0x00, 0x14, 0x14, 0x20, 0x28,
	0x12, 0x12, 0x17, 0x0a, 0x01, 0xe6, 0xe6, 0xe6, 0xe6, 0xe6,
};

static const unsigned char seq_display[] = {
	0xb2, 0x00, 0x2b, 0x03, 0x03, 0x70, 0x00, 0xff, 0x00, 0x00,
	0x00, 0x00, 0x03, 0x03, 0x00, 0x01,
};

static const unsigned char seq_rgb_if[] = {
	0xb3, 0x09,
};

static const unsigned char seq_display_inv[] = {
	0xb4, 0x01, 0x08, 0x77, 0x0e, 0x06,
};

static const unsigned char seq_vcom[] = {
	0xb6, 0x4c, 0x2e,
};

static const unsigned char seq_gate[] = {
	0xd5, 0x00, 0x05, 0x03, 0x29, 0x01, 0x07, 0x17, 0x68, 0x13,
	0x37, 0x20, 0x31, 0x8a, 0x46, 0x9b, 0x57, 0x13, 0x02, 0x75,
	0xb9, 0x64, 0xa8, 0x07, 0x0f, 0x04, 0x07,
};

static const unsigned char seq_panel[] = {
	0xcc, 0x02,
};

static const unsigned char seq_col_mod[] = {
	0x3a, 0x77,
};

static const unsigned char seq_w_gamma[] = {
	0xe0, 0x00, 0x04, 0x09, 0x0f, 0x1f, 0x3f, 0x1f, 0x2f, 0x0a,
	0x0f, 0x10, 0x16, 0x18, 0x16, 0x17, 0x0d, 0x15, 0x00, 0x04,
	0x09, 0x0f, 0x38, 0x3f, 0x20, 0x39, 0x0a, 0x0f, 0x10, 0x16,
	0x18, 0x16, 0x17, 0x0d, 0x15,
};

static const unsigned char seq_rgb_gamma[] = {
	0xc1, 0x01, 0x03, 0x07, 0x0f, 0x1a, 0x22, 0x2c, 0x33, 0x3c,
	0x46, 0x4f, 0x58, 0x60, 0x69, 0x71, 0x79, 0x82, 0x89, 0x92,
	0x9a, 0xa1, 0xa9, 0xb1, 0xb9, 0xc1, 0xc9, 0xcf, 0xd6, 0xde,
	0xe5, 0xec, 0xf3, 0xf9, 0xff, 0xdd, 0x39, 0x07, 0x1c, 0xcb,
	0xab, 0x5f, 0x49, 0x80, 0x03, 0x07, 0x0f, 0x19, 0x20, 0x2a,
	0x31, 0x39, 0x42, 0x4b, 0x53, 0x5b, 0x63, 0x6b, 0x73, 0x7b,
	0x83, 0x8a, 0x92, 0x9b, 0xa2, 0xaa, 0xb2, 0xba, 0xc2, 0xca,
	0xd0, 0xd8, 0xe1, 0xe8, 0xf0, 0xf8, 0xff, 0xf7, 0xd8, 0xbe,
	0xa7, 0x39, 0x40, 0x85, 0x8c, 0xc0, 0x04, 0x07, 0x0c, 0x17,
	0x1c, 0x23, 0x2b, 0x34, 0x3b, 0x43, 0x4c, 0x54, 0x5b, 0x63,
	0x6a, 0x73, 0x7a, 0x82, 0x8a, 0x91, 0x98, 0xa1, 0xa8, 0xb0,
	0xb7, 0xc1, 0xc9, 0xcf, 0xd9, 0xe3, 0xea, 0xf4, 0xff, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
};

static const unsigned char seq_up_dn[] = {
	0x36, 0x10,
};

static const unsigned char seq_sleep_in[] = {
	0x10,
};

static const unsigned char seq_sleep_out[] = {
	0x11,
};

static const unsigned char seq_display_on[] = {
	0x29,
};

static const unsigned char seq_display_off[] = {
	0x10,
};

static int lms501kf03_spi_write_byte(struct lms501kf03 *lcd, int addr, int data)
{
	u16 buf[1];
	struct spi_message msg;

	struct spi_transfer xfer = {
		.len		= 2,
		.tx_buf		= buf,
	};

	buf[0] = (addr << 8) | data;

	spi_message_init(&msg);
	spi_message_add_tail(&xfer, &msg);

	return spi_sync(lcd->spi, &msg);
}

static int lms501kf03_spi_write(struct lms501kf03 *lcd, unsigned char address,
				unsigned char command)
{
	return lms501kf03_spi_write_byte(lcd, address, command);
}

static int lms501kf03_panel_send_sequence(struct lms501kf03 *lcd,
					const unsigned char *wbuf,
					unsigned int len)
{
	int ret = 0, i = 0;

	while (i < len) {
		if (i == 0)
			ret = lms501kf03_spi_write(lcd, COMMAND_ONLY, wbuf[i]);
		else
			ret = lms501kf03_spi_write(lcd, DATA_ONLY, wbuf[i]);
		if (ret)
			break;
		i += 1;
	}

	return ret;
}

static int lms501kf03_ldi_init(struct lms501kf03 *lcd)
{
	int ret, i;
	static const unsigned char *init_seq[] = {
		seq_password,
		seq_power,
		seq_display,
		seq_rgb_if,
		seq_display_inv,
		seq_vcom,
		seq_gate,
		seq_panel,
		seq_col_mod,
		seq_w_gamma,
		seq_rgb_gamma,
		seq_sleep_out,
	};

	static const unsigned int size_seq[] = {
		ARRAY_SIZE(seq_password),
		ARRAY_SIZE(seq_power),
		ARRAY_SIZE(seq_display),
		ARRAY_SIZE(seq_rgb_if),
		ARRAY_SIZE(seq_display_inv),
		ARRAY_SIZE(seq_vcom),
		ARRAY_SIZE(seq_gate),
		ARRAY_SIZE(seq_panel),
		ARRAY_SIZE(seq_col_mod),
		ARRAY_SIZE(seq_w_gamma),
		ARRAY_SIZE(seq_rgb_gamma),
		ARRAY_SIZE(seq_sleep_out),
	};

	for (i = 0; i < ARRAY_SIZE(init_seq); i++) {
		ret = lms501kf03_panel_send_sequence(lcd, init_seq[i],
						size_seq[i]);
		if (ret)
			break;
	}
	/*
	 * According to the datasheet, 120ms delay time is required.
	 * After sleep out sequence, command is blocked for 120ms.
	 * Thus, LDI should wait for 120ms.
	 */
	msleep(120);

	return ret;
}

static int lms501kf03_ldi_enable(struct lms501kf03 *lcd)
{
	return lms501kf03_panel_send_sequence(lcd, seq_display_on,
					ARRAY_SIZE(seq_display_on));
}

static int lms501kf03_ldi_disable(struct lms501kf03 *lcd)
{
	return lms501kf03_panel_send_sequence(lcd, seq_display_off,
					ARRAY_SIZE(seq_display_off));
}

static int lms501kf03_power_is_on(int power)
{
	return (power) <= FB_BLANK_NORMAL;
}

static int lms501kf03_power_on(struct lms501kf03 *lcd)
{
	int ret = 0;
	struct lcd_platform_data *pd;

	pd = lcd->lcd_pd;

	if (!pd->power_on) {
		dev_err(lcd->dev, "power_on is NULL.\n");
		return -EINVAL;
	} else {
		pd->power_on(lcd->ld, 1);
		msleep(pd->power_on_delay);
	}

	if (!pd->reset) {
		dev_err(lcd->dev, "reset is NULL.\n");
		return -EINVAL;
	} else {
		pd->reset(lcd->ld);
		msleep(pd->reset_delay);
	}

	ret = lms501kf03_ldi_init(lcd);
	if (ret) {
		dev_err(lcd->dev, "failed to initialize ldi.\n");
		return ret;
	}

	ret = lms501kf03_ldi_enable(lcd);
	if (ret) {
		dev_err(lcd->dev, "failed to enable ldi.\n");
		return ret;
	}

	return 0;
}

static int lms501kf03_power_off(struct lms501kf03 *lcd)
{
	int ret = 0;
	struct lcd_platform_data *pd;

	pd = lcd->lcd_pd;

	ret = lms501kf03_ldi_disable(lcd);
	if (ret) {
		dev_err(lcd->dev, "lcd setting failed.\n");
		return -EIO;
	}

	msleep(pd->power_off_delay);

	pd->power_on(lcd->ld, 0);

	return 0;
}

static int lms501kf03_power(struct lms501kf03 *lcd, int power)
{
	int ret = 0;

	if (lms501kf03_power_is_on(power) &&
		!lms501kf03_power_is_on(lcd->power))
		ret = lms501kf03_power_on(lcd);
	else if (!lms501kf03_power_is_on(power) &&
		lms501kf03_power_is_on(lcd->power))
		ret = lms501kf03_power_off(lcd);

	if (!ret)
		lcd->power = power;

	return ret;
}

static int lms501kf03_get_power(struct lcd_device *ld)
{
	struct lms501kf03 *lcd = lcd_get_data(ld);

	return lcd->power;
}

static int lms501kf03_set_power(struct lcd_device *ld, int power)
{
	struct lms501kf03 *lcd = lcd_get_data(ld);

	if (power != FB_BLANK_UNBLANK && power != FB_BLANK_POWERDOWN &&
		power != FB_BLANK_NORMAL) {
		dev_err(lcd->dev, "power value should be 0, 1 or 4.\n");
		return -EINVAL;
	}

	return lms501kf03_power(lcd, power);
}

static struct lcd_ops lms501kf03_lcd_ops = {
	.get_power = lms501kf03_get_power,
	.set_power = lms501kf03_set_power,
};

static int lms501kf03_probe(struct spi_device *spi)
{
	struct lms501kf03 *lcd = NULL;
	struct lcd_device *ld = NULL;
	int ret = 0;

	lcd = devm_kzalloc(&spi->dev, sizeof(struct lms501kf03), GFP_KERNEL);
	if (!lcd)
		return -ENOMEM;

	/* lms501kf03 lcd panel uses 3-wire 9-bit SPI Mode. */
	spi->bits_per_word = 9;

	ret = spi_setup(spi);
	if (ret < 0) {
		dev_err(&spi->dev, "spi setup failed.\n");
		return ret;
	}

	lcd->spi = spi;
	lcd->dev = &spi->dev;

	lcd->lcd_pd = spi->dev.platform_data;
	if (!lcd->lcd_pd) {
		dev_err(&spi->dev, "platform data is NULL\n");
		return -EINVAL;
	}

	ld = lcd_device_register("lms501kf03", &spi->dev, lcd,
				&lms501kf03_lcd_ops);
	if (IS_ERR(ld))
		return PTR_ERR(ld);

	lcd->ld = ld;

	if (!lcd->lcd_pd->lcd_enabled) {
		/*
		 * if lcd panel was off from bootloader then
		 * current lcd status is powerdown and then
		 * it enables lcd panel.
		 */
		lcd->power = FB_BLANK_POWERDOWN;

		lms501kf03_power(lcd, FB_BLANK_UNBLANK);
	} else {
		lcd->power = FB_BLANK_UNBLANK;
	}

	spi_set_drvdata(spi, lcd);

	dev_info(&spi->dev, "lms501kf03 panel driver has been probed.\n");

	return 0;
}

static int lms501kf03_remove(struct spi_device *spi)
{
	struct lms501kf03 *lcd = spi_get_drvdata(spi);

	lms501kf03_power(lcd, FB_BLANK_POWERDOWN);
	lcd_device_unregister(lcd->ld);

	return 0;
}

#if defined(CONFIG_PM)

static int lms501kf03_suspend(struct spi_device *spi, pm_message_t mesg)
{
	struct lms501kf03 *lcd = spi_get_drvdata(spi);

	dev_dbg(&spi->dev, "lcd->power = %d\n", lcd->power);

	/*
	 * when lcd panel is suspend, lcd panel becomes off
	 * regardless of status.
	 */
	return lms501kf03_power(lcd, FB_BLANK_POWERDOWN);
}

static int lms501kf03_resume(struct spi_device *spi)
{
	struct lms501kf03 *lcd = spi_get_drvdata(spi);

	lcd->power = FB_BLANK_POWERDOWN;

	return lms501kf03_power(lcd, FB_BLANK_UNBLANK);
}
#else
#define lms501kf03_suspend	NULL
#define lms501kf03_resume	NULL
#endif

static void lms501kf03_shutdown(struct spi_device *spi)
{
	struct lms501kf03 *lcd = spi_get_drvdata(spi);

	lms501kf03_power(lcd, FB_BLANK_POWERDOWN);
}

static struct spi_driver lms501kf03_driver = {
	.driver = {
		.name	= "lms501kf03",
		.owner	= THIS_MODULE,
	},
	.probe		= lms501kf03_probe,
	.remove		= lms501kf03_remove,
	.shutdown	= lms501kf03_shutdown,
	.suspend	= lms501kf03_suspend,
	.resume		= lms501kf03_resume,
};

module_spi_driver(lms501kf03_driver);

MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
MODULE_DESCRIPTION("lms501kf03 LCD Driver");
MODULE_LICENSE("GPL");