2 * LCD / Backlight control code for Sharp SL-6000x (tosa)
4 * Copyright (c) 2005 Dirk Opfer
5 * Copyright (c) 2007,2008 Dmitry Baryshkov
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.
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/gpio.h>
19 #include <linux/delay.h>
20 #include <linux/lcd.h>
23 #include <asm/mach/sharpsl_param.h>
25 #include <mach/tosa.h>
27 #define POWER_IS_ON(pwr) ((pwr) <= FB_BLANK_NORMAL)
29 #define TG_REG0_VQV 0x0001
30 #define TG_REG0_COLOR 0x0002
31 #define TG_REG0_UD 0x0004
32 #define TG_REG0_LR 0x0008
36 struct tosa_lcd_data {
37 struct spi_device *spi;
38 struct lcd_device *lcd;
39 struct i2c_client *i2c;
45 static int tosa_tg_send(struct spi_device *spi, int adrs, uint8_t data)
48 struct spi_message msg;
49 struct spi_transfer xfer = {
55 buf[0] = ((adrs & 0x07) << 5) | (data & 0x1f);
56 spi_message_init(&msg);
57 spi_message_add_tail(&xfer, &msg);
59 return spi_sync(spi, &msg);
62 int tosa_bl_enable(struct spi_device *spi, int enable)
64 /* bl_enable GP04=1 otherwise GP04=0*/
65 return tosa_tg_send(spi, TG_GPODR2, enable? 0x01 : 0x00);
67 EXPORT_SYMBOL(tosa_bl_enable);
69 static void tosa_lcd_tg_init(struct tosa_lcd_data *data)
72 gpio_set_value(TOSA_GPIO_TG_ON, 0);
76 /* delayed 0clk TCTL signal for VGA */
77 tosa_tg_send(data->spi, TG_TPOSCTL, 0x00);
78 /* GPOS0=powercontrol, GPOS1=GPIO, GPOS2=TCTL */
79 tosa_tg_send(data->spi, TG_GPOSR, 0x02);
82 static void tosa_lcd_tg_on(struct tosa_lcd_data *data)
84 struct spi_device *spi = data->spi;
85 int value = TG_REG0_COLOR | TG_REG0_UD | TG_REG0_LR;
90 tosa_tg_send(spi, TG_PNLCTL, value);
92 /* TG LCD pannel power up */
93 tosa_tg_send(spi, TG_PINICTL,0x4);
97 tosa_tg_send(spi, TG_PINICTL,0x0);
100 /* after the pannel is powered up the first time, we can access the i2c bus */
101 /* so probe for the DAC */
102 struct i2c_adapter *adap = i2c_get_adapter(0);
103 struct i2c_board_info info = {
106 .platform_data = data->spi,
108 data->i2c = i2c_new_device(adap, &info);
112 static void tosa_lcd_tg_off(struct tosa_lcd_data *data)
114 struct spi_device *spi = data->spi;
116 /* TG LCD VHSA off */
117 tosa_tg_send(spi, TG_PINICTL,0x4);
120 /* TG LCD signal off */
121 tosa_tg_send(spi, TG_PINICTL,0x6);
125 gpio_set_value(TOSA_GPIO_TG_ON, 1);
129 int tosa_lcd_set_power(struct lcd_device *lcd, int power)
131 struct tosa_lcd_data *data = lcd_get_data(lcd);
133 if (POWER_IS_ON(power) && !POWER_IS_ON(data->lcd_power))
134 tosa_lcd_tg_on(data);
136 if (!POWER_IS_ON(power) && POWER_IS_ON(data->lcd_power))
137 tosa_lcd_tg_off(data);
139 data->lcd_power = power;
143 static int tosa_lcd_get_power(struct lcd_device *lcd)
145 struct tosa_lcd_data *data = lcd_get_data(lcd);
147 return data->lcd_power;
150 static int tosa_lcd_set_mode(struct lcd_device *lcd, struct fb_videomode *mode)
152 struct tosa_lcd_data *data = lcd_get_data(lcd);
154 if (mode->xres == 320 || mode->yres == 320)
155 data->is_vga = false;
159 if (POWER_IS_ON(data->lcd_power))
160 tosa_lcd_tg_on(data);
165 static struct lcd_ops tosa_lcd_ops = {
166 .set_power = tosa_lcd_set_power,
167 .get_power = tosa_lcd_get_power,
168 .set_mode = tosa_lcd_set_mode,
171 static int __devinit tosa_lcd_probe(struct spi_device *spi)
174 struct tosa_lcd_data *data;
176 data = kzalloc(sizeof(struct tosa_lcd_data), GFP_KERNEL);
180 data->is_vga = true; /* defaut to VGA mode */
183 * bits_per_word cannot be configured in platform data
185 spi->bits_per_word = 8;
187 ret = spi_setup(spi);
192 dev_set_drvdata(&spi->dev, data);
194 ret = gpio_request(TOSA_GPIO_TG_ON, "tg #pwr");
200 ret = gpio_direction_output(TOSA_GPIO_TG_ON, 0);
205 tosa_lcd_tg_init(data);
207 tosa_lcd_tg_on(data);
209 data->lcd = lcd_device_register("tosa-lcd", &spi->dev, data,
212 if (IS_ERR(data->lcd)) {
213 ret = PTR_ERR(data->lcd);
221 tosa_lcd_tg_off(data);
223 gpio_free(TOSA_GPIO_TG_ON);
225 dev_set_drvdata(&spi->dev, NULL);
231 static int __devexit tosa_lcd_remove(struct spi_device *spi)
233 struct tosa_lcd_data *data = dev_get_drvdata(&spi->dev);
235 lcd_device_unregister(data->lcd);
238 i2c_unregister_device(data->i2c);
240 tosa_lcd_tg_off(data);
242 gpio_free(TOSA_GPIO_TG_ON);
243 dev_set_drvdata(&spi->dev, NULL);
250 static int tosa_lcd_suspend(struct spi_device *spi, pm_message_t state)
252 struct tosa_lcd_data *data = dev_get_drvdata(&spi->dev);
254 tosa_lcd_tg_off(data);
259 static int tosa_lcd_resume(struct spi_device *spi)
261 struct tosa_lcd_data *data = dev_get_drvdata(&spi->dev);
263 tosa_lcd_tg_init(data);
264 if (POWER_IS_ON(data->lcd_power))
265 tosa_lcd_tg_on(data);
267 tosa_lcd_tg_off(data);
272 #define tosa_lcd_suspend NULL
273 #define tosa_lcd_reume NULL
276 static struct spi_driver tosa_lcd_driver = {
279 .owner = THIS_MODULE,
281 .probe = tosa_lcd_probe,
282 .remove = __devexit_p(tosa_lcd_remove),
283 .suspend = tosa_lcd_suspend,
284 .resume = tosa_lcd_resume,
287 static int __init tosa_lcd_init(void)
289 return spi_register_driver(&tosa_lcd_driver);
292 static void __exit tosa_lcd_exit(void)
294 spi_unregister_driver(&tosa_lcd_driver);
297 module_init(tosa_lcd_init);
298 module_exit(tosa_lcd_exit);
300 MODULE_AUTHOR("Dmitry Baryshkov");
301 MODULE_LICENSE("GPL v2");
302 MODULE_DESCRIPTION("LCD/Backlight control for Sharp SL-6000 PDA");