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1/*
2 *  LCD / Backlight control code for Sharp SL-6000x (tosa)
3 *
4 *  Copyright (c) 2005		Dirk Opfer
5 *  Copyright (c) 2007,2008	Dmitry Baryshkov
6 *
7 *  This program is free software; you can redistribute it and/or modify
8 *  it under the terms of the GNU General Public License version 2 as
9 *  published by the Free Software Foundation.
10 *
11 */
12
13#include <linux/kernel.h>
14#include <linux/module.h>
15#include <linux/device.h>
16#include <linux/spi/spi.h>
17#include <linux/i2c.h>
18#include <linux/slab.h>
19#include <linux/gpio.h>
20#include <linux/delay.h>
21#include <linux/lcd.h>
22#include <linux/fb.h>
23
24#include <asm/mach/sharpsl_param.h>
25
26#include <mach/tosa.h>
27
28#define POWER_IS_ON(pwr)	((pwr) <= FB_BLANK_NORMAL)
29
30#define TG_REG0_VQV	0x0001
31#define TG_REG0_COLOR	0x0002
32#define TG_REG0_UD	0x0004
33#define TG_REG0_LR	0x0008
34
35#define	DAC_BASE	0x4e
36
37struct tosa_lcd_data {
38	struct spi_device *spi;
39	struct lcd_device *lcd;
40	struct i2c_client *i2c;
41
42	int lcd_power;
43	bool is_vga;
44};
45
46static int tosa_tg_send(struct spi_device *spi, int adrs, uint8_t data)
47{
48	u8 buf[1];
49	struct spi_message msg;
50	struct spi_transfer xfer = {
51		.len		= 1,
52		.cs_change	= 1,
53		.tx_buf		= buf,
54	};
55
56	buf[0] = ((adrs & 0x07) << 5) | (data & 0x1f);
57	spi_message_init(&msg);
58	spi_message_add_tail(&xfer, &msg);
59
60	return spi_sync(spi, &msg);
61}
62
63int tosa_bl_enable(struct spi_device *spi, int enable)
64{
65	/* bl_enable GP04=1 otherwise GP04=0*/
66	return tosa_tg_send(spi, TG_GPODR2, enable ? 0x01 : 0x00);
67}
68EXPORT_SYMBOL(tosa_bl_enable);
69
70static void tosa_lcd_tg_init(struct tosa_lcd_data *data)
71{
72	/* TG on */
73	gpio_set_value(TOSA_GPIO_TG_ON, 0);
74
75	mdelay(60);
76
77	/* delayed 0clk TCTL signal for VGA */
78	tosa_tg_send(data->spi, TG_TPOSCTL, 0x00);
79	/* GPOS0=powercontrol, GPOS1=GPIO, GPOS2=TCTL */
80	tosa_tg_send(data->spi, TG_GPOSR, 0x02);
81}
82
83static void tosa_lcd_tg_on(struct tosa_lcd_data *data)
84{
85	struct spi_device *spi = data->spi;
86	int value = TG_REG0_COLOR | TG_REG0_UD | TG_REG0_LR;
87
88	if (data->is_vga)
89		value |= TG_REG0_VQV;
90
91	tosa_tg_send(spi, TG_PNLCTL, value);
92
93	/* TG LCD pannel power up */
94	tosa_tg_send(spi, TG_PINICTL, 0x4);
95	mdelay(50);
96
97	/* TG LCD GVSS */
98	tosa_tg_send(spi, TG_PINICTL, 0x0);
99
100	if (!data->i2c) {
101		/*
102		 * after the pannel is powered up the first time,
103		 * we can access the i2c bus so probe for the DAC
104		 */
105		struct i2c_adapter *adap = i2c_get_adapter(0);
106		struct i2c_board_info info = {
107			.type	= "tosa-bl",
108			.addr	= DAC_BASE,
109			.platform_data = data->spi,
110		};
111		data->i2c = i2c_new_device(adap, &info);
112	}
113}
114
115static void tosa_lcd_tg_off(struct tosa_lcd_data *data)
116{
117	struct spi_device *spi = data->spi;
118
119	/* TG LCD VHSA off */
120	tosa_tg_send(spi, TG_PINICTL, 0x4);
121	mdelay(50);
122
123	/* TG LCD signal off */
124	tosa_tg_send(spi, TG_PINICTL, 0x6);
125	mdelay(50);
126
127	/* TG Off */
128	gpio_set_value(TOSA_GPIO_TG_ON, 1);
129	mdelay(100);
130}
131
132int tosa_lcd_set_power(struct lcd_device *lcd, int power)
133{
134	struct tosa_lcd_data *data = lcd_get_data(lcd);
135
136	if (POWER_IS_ON(power) && !POWER_IS_ON(data->lcd_power))
137		tosa_lcd_tg_on(data);
138
139	if (!POWER_IS_ON(power) && POWER_IS_ON(data->lcd_power))
140		tosa_lcd_tg_off(data);
141
142	data->lcd_power = power;
143	return 0;
144}
145
146static int tosa_lcd_get_power(struct lcd_device *lcd)
147{
148	struct tosa_lcd_data *data = lcd_get_data(lcd);
149
150	return data->lcd_power;
151}
152
153static int tosa_lcd_set_mode(struct lcd_device *lcd, struct fb_videomode *mode)
154{
155	struct tosa_lcd_data *data = lcd_get_data(lcd);
156
157	if (mode->xres == 320 || mode->yres == 320)
158		data->is_vga = false;
159	else
160		data->is_vga = true;
161
162	if (POWER_IS_ON(data->lcd_power))
163		tosa_lcd_tg_on(data);
164
165	return 0;
166}
167
168static struct lcd_ops tosa_lcd_ops = {
169	.set_power = tosa_lcd_set_power,
170	.get_power = tosa_lcd_get_power,
171	.set_mode = tosa_lcd_set_mode,
172};
173
174static int tosa_lcd_probe(struct spi_device *spi)
175{
176	int ret;
177	struct tosa_lcd_data *data;
178
179	data = devm_kzalloc(&spi->dev, sizeof(struct tosa_lcd_data),
180				GFP_KERNEL);
181	if (!data)
182		return -ENOMEM;
183
184	data->is_vga = true; /* default to VGA mode */
185
186	/*
187	 * bits_per_word cannot be configured in platform data
188	 */
189	spi->bits_per_word = 8;
190
191	ret = spi_setup(spi);
192	if (ret < 0)
193		return ret;
194
195	data->spi = spi;
196	spi_set_drvdata(spi, data);
197
198	ret = devm_gpio_request_one(&spi->dev, TOSA_GPIO_TG_ON,
199				GPIOF_OUT_INIT_LOW, "tg #pwr");
200	if (ret < 0)
201		return ret;
202
203	mdelay(60);
204
205	tosa_lcd_tg_init(data);
206
207	tosa_lcd_tg_on(data);
208
209	data->lcd = devm_lcd_device_register(&spi->dev, "tosa-lcd", &spi->dev,
210					data, &tosa_lcd_ops);
211
212	if (IS_ERR(data->lcd)) {
213		ret = PTR_ERR(data->lcd);
214		data->lcd = NULL;
215		goto err_register;
216	}
217
218	return 0;
219
220err_register:
221	tosa_lcd_tg_off(data);
222	return ret;
223}
224
225static int tosa_lcd_remove(struct spi_device *spi)
226{
227	struct tosa_lcd_data *data = spi_get_drvdata(spi);
228
229	if (data->i2c)
230		i2c_unregister_device(data->i2c);
231
232	tosa_lcd_tg_off(data);
233
234	return 0;
235}
236
237#ifdef CONFIG_PM_SLEEP
238static int tosa_lcd_suspend(struct device *dev)
239{
240	struct tosa_lcd_data *data = dev_get_drvdata(dev);
241
242	tosa_lcd_tg_off(data);
243
244	return 0;
245}
246
247static int tosa_lcd_resume(struct device *dev)
248{
249	struct tosa_lcd_data *data = dev_get_drvdata(dev);
250
251	tosa_lcd_tg_init(data);
252	if (POWER_IS_ON(data->lcd_power))
253		tosa_lcd_tg_on(data);
254	else
255		tosa_lcd_tg_off(data);
256
257	return 0;
258}
259#endif
260
261static SIMPLE_DEV_PM_OPS(tosa_lcd_pm_ops, tosa_lcd_suspend, tosa_lcd_resume);
262
263static struct spi_driver tosa_lcd_driver = {
264	.driver = {
265		.name		= "tosa-lcd",
266		.owner		= THIS_MODULE,
267		.pm		= &tosa_lcd_pm_ops,
268	},
269	.probe		= tosa_lcd_probe,
270	.remove		= tosa_lcd_remove,
271};
272
273module_spi_driver(tosa_lcd_driver);
274
275MODULE_AUTHOR("Dmitry Baryshkov");
276MODULE_LICENSE("GPL v2");
277MODULE_DESCRIPTION("LCD/Backlight control for Sharp SL-6000 PDA");
278MODULE_ALIAS("spi:tosa-lcd");
279