diff options
Diffstat (limited to 'drivers/video/backlight/tosa_lcd.c')
| -rw-r--r-- | drivers/video/backlight/tosa_lcd.c | 280 |
1 files changed, 280 insertions, 0 deletions
diff --git a/drivers/video/backlight/tosa_lcd.c b/drivers/video/backlight/tosa_lcd.c new file mode 100644 index 00000000000..57a26649f1a --- /dev/null +++ b/drivers/video/backlight/tosa_lcd.c @@ -0,0 +1,280 @@ +/* + * LCD / Backlight control code for Sharp SL-6000x (tosa) + * + * Copyright (c) 2005 Dirk Opfer + * Copyright (c) 2007,2008 Dmitry Baryshkov + * + * 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. + * + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/device.h> +#include <linux/spi/spi.h> +#include <linux/i2c.h> +#include <linux/gpio.h> +#include <linux/delay.h> +#include <linux/lcd.h> +#include <linux/fb.h> + +#include <asm/mach/sharpsl_param.h> + +#include <mach/tosa.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 + +#define DAC_BASE 0x4e + +struct tosa_lcd_data { + struct spi_device *spi; + struct lcd_device *lcd; + struct i2c_client *i2c; + + int lcd_power; +}; + +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 = 1, + .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 */ + gpio_set_value(TOSA_GPIO_TG_ON, 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; + const int value = TG_REG0_COLOR | TG_REG0_UD | TG_REG0_LR; + tosa_tg_send(spi, TG_PNLCTL, value | TG_REG0_VQV); /* this depends on mode */ + + /* 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 (!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 = { + .type = "tosa-bl", + .addr = DAC_BASE, + .platform_data = data->spi, + }; + data->i2c = i2c_new_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 */ + gpio_set_value(TOSA_GPIO_TG_ON, 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 struct lcd_ops tosa_lcd_ops = { + .set_power = tosa_lcd_set_power, + .get_power = tosa_lcd_get_power, +}; + +static int __devinit tosa_lcd_probe(struct spi_device *spi) +{ + int ret; + struct tosa_lcd_data *data; + + data = kzalloc(sizeof(struct tosa_lcd_data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + /* + * bits_per_word cannot be configured in platform data + */ + spi->bits_per_word = 8; + + ret = spi_setup(spi); + if (ret < 0) + goto err_spi; + + data->spi = spi; + dev_set_drvdata(&spi->dev, data); + + ret = gpio_request(TOSA_GPIO_TG_ON, "tg #pwr"); + if (ret < 0) + goto err_gpio_tg; + + mdelay(60); + + ret = gpio_direction_output(TOSA_GPIO_TG_ON, 0); + if (ret < 0) + goto err_gpio_dir; + + mdelay(60); + tosa_lcd_tg_init(data); + + tosa_lcd_tg_on(data); + + data->lcd = lcd_device_register("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); +err_gpio_dir: + gpio_free(TOSA_GPIO_TG_ON); +err_gpio_tg: + dev_set_drvdata(&spi->dev, NULL); +err_spi: + kfree(data); + return ret; +} + +static int __devexit tosa_lcd_remove(struct spi_device *spi) +{ + struct tosa_lcd_data *data = dev_get_drvdata(&spi->dev); + + lcd_device_unregister(data->lcd); + + if (data->i2c) + i2c_unregister_device(data->i2c); + + tosa_lcd_tg_off(data); + + gpio_free(TOSA_GPIO_TG_ON); + dev_set_drvdata(&spi->dev, NULL); + kfree(data); + + return 0; +} + +#ifdef CONFIG_PM +static int tosa_lcd_suspend(struct spi_device *spi, pm_message_t state) +{ + struct tosa_lcd_data *data = dev_get_drvdata(&spi->dev); + + tosa_lcd_tg_off(data); + + return 0; +} + +static int tosa_lcd_resume(struct spi_device *spi) +{ + struct tosa_lcd_data *data = dev_get_drvdata(&spi->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; +} +#else +#define tosa_lcd_suspend NULL +#define tosa_lcd_reume NULL +#endif + +static struct spi_driver tosa_lcd_driver = { + .driver = { + .name = "tosa-lcd", + .owner = THIS_MODULE, + }, + .probe = tosa_lcd_probe, + .remove = __devexit_p(tosa_lcd_remove), + .suspend = tosa_lcd_suspend, + .resume = tosa_lcd_resume, +}; + +static int __init tosa_lcd_init(void) +{ + return spi_register_driver(&tosa_lcd_driver); +} + +static void __exit tosa_lcd_exit(void) +{ + spi_unregister_driver(&tosa_lcd_driver); +} + +module_init(tosa_lcd_init); +module_exit(tosa_lcd_exit); + +MODULE_AUTHOR("Dmitry Baryshkov"); +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("LCD/Backlight control for Sharp SL-6000 PDA"); + |