summaryrefslogtreecommitdiffstats
path: root/drivers/video/backlight/tosa_lcd.c
blob: 38765544345b8d76f07aacfd6038f1855ad082e2 (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
// SPDX-License-Identifier: GPL-2.0-only
/*
 *  LCD / Backlight control code for Sharp SL-6000x (tosa)
 *
 *  Copyright (c) 2005		Dirk Opfer
 *  Copyright (c) 2007,2008	Dmitry Baryshkov
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/spi/spi.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/gpio/consumer.h>
#include <linux/delay.h>
#include <linux/lcd.h>
#include <linux/fb.h>

#include <asm/mach/sharpsl_param.h>

#include "tosa_bl.h"

#define POWER_IS_ON(pwr)	((pwr) <= FB_BLANK_NORMAL)

#define TG_REG0_VQV	0x0001
#define TG_REG0_COLOR	0x0002
#define TG_REG0_UD	0x0004
#define TG_REG0_LR	0x0008

/*
 * Timing Generator
 */
#define TG_PNLCTL 	0x00
#define TG_TPOSCTL 	0x01
#define TG_DUTYCTL 	0x02
#define TG_GPOSR 	0x03
#define TG_GPODR1 	0x04
#define TG_GPODR2 	0x05
#define TG_PINICTL 	0x06
#define TG_HPOSCTL 	0x07


#define	DAC_BASE	0x4e

struct tosa_lcd_data {
	struct spi_device *spi;
	struct lcd_device *lcd;
	struct i2c_client *i2c;
	struct gpio_desc *gpiod_tg;

	int lcd_power;
	bool is_vga;
};

static int tosa_tg_send(struct spi_device *spi, int adrs, uint8_t data)
{
	u8 buf[1];
	struct spi_message msg;
	struct spi_transfer xfer = {
		.len		= 1,
		.cs_change	= 0,
		.tx_buf		= buf,
	};

	buf[0] = ((adrs & 0x07) << 5) | (data & 0x1f);
	spi_message_init(&msg);
	spi_message_add_tail(&xfer, &msg);

	return spi_sync(spi, &msg);
}

int tosa_bl_enable(struct spi_device *spi, int enable)
{
	/* bl_enable GP04=1 otherwise GP04=0*/
	return tosa_tg_send(spi, TG_GPODR2, enable ? 0x01 : 0x00);
}
EXPORT_SYMBOL(tosa_bl_enable);

static void tosa_lcd_tg_init(struct tosa_lcd_data *data)
{
	/* TG on */
	gpiod_set_value(data->gpiod_tg, 0);

	mdelay(60);

	/* delayed 0clk TCTL signal for VGA */
	tosa_tg_send(data->spi, TG_TPOSCTL, 0x00);
	/* GPOS0=powercontrol, GPOS1=GPIO, GPOS2=TCTL */
	tosa_tg_send(data->spi, TG_GPOSR, 0x02);
}

static void tosa_lcd_tg_on(struct tosa_lcd_data *data)
{
	struct spi_device *spi = data->spi;
	int value = TG_REG0_COLOR | TG_REG0_UD | TG_REG0_LR;

	if (data->is_vga)
		value |= TG_REG0_VQV;

	tosa_tg_send(spi, TG_PNLCTL, value);

	/* TG LCD pannel power up */
	tosa_tg_send(spi, TG_PINICTL, 0x4);
	mdelay(50);

	/* TG LCD GVSS */
	tosa_tg_send(spi, TG_PINICTL, 0x0);

	if (IS_ERR_OR_NULL(data->i2c)) {
		/*
		 * after the pannel is powered up the first time,
		 * we can access the i2c bus so probe for the DAC
		 */
		struct i2c_adapter *adap = i2c_get_adapter(0);
		struct i2c_board_info info = {
			.dev_name = "tosa-bl",
			.type	= "tosa-bl",
			.addr	= DAC_BASE,
			.platform_data = data->spi,
		};
		data->i2c = i2c_new_client_device(adap, &info);
	}
}

static void tosa_lcd_tg_off(struct tosa_lcd_data *data)
{
	struct spi_device *spi = data->spi;

	/* TG LCD VHSA off */
	tosa_tg_send(spi, TG_PINICTL, 0x4);
	mdelay(50);

	/* TG LCD signal off */
	tosa_tg_send(spi, TG_PINICTL, 0x6);
	mdelay(50);

	/* TG Off */
	gpiod_set_value(data->gpiod_tg, 1);
	mdelay(100);
}

int tosa_lcd_set_power(struct lcd_device *lcd, int power)
{
	struct tosa_lcd_data *data = lcd_get_data(lcd);

	if (POWER_IS_ON(power) && !POWER_IS_ON(data->lcd_power))
		tosa_lcd_tg_on(data);

	if (!POWER_IS_ON(power) && POWER_IS_ON(data->lcd_power))
		tosa_lcd_tg_off(data);

	data->lcd_power = power;
	return 0;
}

static int tosa_lcd_get_power(struct lcd_device *lcd)
{
	struct tosa_lcd_data *data = lcd_get_data(lcd);

	return data->lcd_power;
}

static int tosa_lcd_set_mode(struct lcd_device *lcd, struct fb_videomode *mode)
{
	struct tosa_lcd_data *data = lcd_get_data(lcd);

	if (mode->xres == 320 || mode->yres == 320)
		data->is_vga = false;
	else
		data->is_vga = true;

	if (POWER_IS_ON(data->lcd_power))
		tosa_lcd_tg_on(data);

	return 0;
}

static struct lcd_ops tosa_lcd_ops = {
	.set_power = tosa_lcd_set_power,
	.get_power = tosa_lcd_get_power,
	.set_mode = tosa_lcd_set_mode,
};

static int tosa_lcd_probe(struct spi_device *spi)
{
	int ret;
	struct tosa_lcd_data *data;

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

	data->is_vga = true; /* default to VGA mode */

	/*
	 * bits_per_word cannot be configured in platform data
	 */
	spi->bits_per_word = 8;

	ret = spi_setup(spi);
	if (ret < 0)
		return ret;

	data->spi = spi;
	spi_set_drvdata(spi, data);

	data->gpiod_tg = devm_gpiod_get(&spi->dev, "tg #pwr", GPIOD_OUT_LOW);
	if (IS_ERR(data->gpiod_tg))
		return PTR_ERR(data->gpiod_tg);

	mdelay(60);

	tosa_lcd_tg_init(data);

	tosa_lcd_tg_on(data);

	data->lcd = devm_lcd_device_register(&spi->dev, "tosa-lcd", &spi->dev,
					data, &tosa_lcd_ops);

	if (IS_ERR(data->lcd)) {
		ret = PTR_ERR(data->lcd);
		data->lcd = NULL;
		goto err_register;
	}

	return 0;

err_register:
	tosa_lcd_tg_off(data);
	return ret;
}

static int tosa_lcd_remove(struct spi_device *spi)
{
	struct tosa_lcd_data *data = spi_get_drvdata(spi);

	i2c_unregister_device(data->i2c);

	tosa_lcd_tg_off(data);

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int tosa_lcd_suspend(struct device *dev)
{
	struct tosa_lcd_data *data = dev_get_drvdata(dev);

	tosa_lcd_tg_off(data);

	return 0;
}

static int tosa_lcd_resume(struct device *dev)
{
	struct tosa_lcd_data *data = dev_get_drvdata(dev);

	tosa_lcd_tg_init(data);
	if (POWER_IS_ON(data->lcd_power))
		tosa_lcd_tg_on(data);
	else
		tosa_lcd_tg_off(data);

	return 0;
}
#endif

static SIMPLE_DEV_PM_OPS(tosa_lcd_pm_ops, tosa_lcd_suspend, tosa_lcd_resume);

static struct spi_driver tosa_lcd_driver = {
	.driver = {
		.name		= "tosa-lcd",
		.pm		= &tosa_lcd_pm_ops,
	},
	.probe		= tosa_lcd_probe,
	.remove		= tosa_lcd_remove,
};

module_spi_driver(tosa_lcd_driver);

MODULE_AUTHOR("Dmitry Baryshkov");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("LCD/Backlight control for Sharp SL-6000 PDA");
MODULE_ALIAS("spi:tosa-lcd");