diff options
Diffstat (limited to 'drivers/video/backlight/tosa_bl.c')
| -rw-r--r-- | drivers/video/backlight/tosa_bl.c | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/drivers/video/backlight/tosa_bl.c b/drivers/video/backlight/tosa_bl.c new file mode 100644 index 000000000000..43edbada12d1 --- /dev/null +++ b/drivers/video/backlight/tosa_bl.c @@ -0,0 +1,198 @@ +/* + * 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/fb.h> +#include <linux/backlight.h> + +#include <asm/mach/sharpsl_param.h> + +#include <mach/tosa.h> + +#define COMADJ_DEFAULT 97 + +#define DAC_CH1 0 +#define DAC_CH2 1 + +struct tosa_bl_data { + struct i2c_client *i2c; + struct backlight_device *bl; + + int comadj; +}; + +static void tosa_bl_set_backlight(struct tosa_bl_data *data, int brightness) +{ + struct spi_device *spi = data->i2c->dev.platform_data; + + i2c_smbus_write_byte_data(data->i2c, DAC_CH1, data->comadj); + + /* SetBacklightDuty */ + i2c_smbus_write_byte_data(data->i2c, DAC_CH2, (u8)(brightness & 0xff)); + + /* SetBacklightVR */ + gpio_set_value(TOSA_GPIO_BL_C20MA, brightness & 0x100); + + tosa_bl_enable(spi, brightness); +} + +static int tosa_bl_update_status(struct backlight_device *dev) +{ + struct backlight_properties *props = &dev->props; + struct tosa_bl_data *data = dev_get_drvdata(&dev->dev); + int power = max(props->power, props->fb_blank); + int brightness = props->brightness; + + if (power) + brightness = 0; + + tosa_bl_set_backlight(data, brightness); + + return 0; +} + +static int tosa_bl_get_brightness(struct backlight_device *dev) +{ + struct backlight_properties *props = &dev->props; + + return props->brightness; +} + +static struct backlight_ops bl_ops = { + .get_brightness = tosa_bl_get_brightness, + .update_status = tosa_bl_update_status, +}; + +static int __devinit tosa_bl_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct tosa_bl_data *data = kzalloc(sizeof(struct tosa_bl_data), GFP_KERNEL); + int ret = 0; + if (!data) + return -ENOMEM; + + data->comadj = sharpsl_param.comadj == -1 ? COMADJ_DEFAULT : sharpsl_param.comadj; + + ret = gpio_request(TOSA_GPIO_BL_C20MA, "backlight"); + if (ret) { + dev_dbg(&data->bl->dev, "Unable to request gpio!\n"); + goto err_gpio_bl; + } + ret = gpio_direction_output(TOSA_GPIO_BL_C20MA, 0); + if (ret) + goto err_gpio_dir; + + i2c_set_clientdata(client, data); + data->i2c = client; + + data->bl = backlight_device_register("tosa-bl", &client->dev, + data, &bl_ops); + if (IS_ERR(data->bl)) { + ret = PTR_ERR(data->bl); + goto err_reg; + } + + data->bl->props.brightness = 69; + data->bl->props.max_brightness = 512 - 1; + data->bl->props.power = FB_BLANK_UNBLANK; + + backlight_update_status(data->bl); + + return 0; + +err_reg: + data->bl = NULL; + i2c_set_clientdata(client, NULL); +err_gpio_dir: + gpio_free(TOSA_GPIO_BL_C20MA); +err_gpio_bl: + kfree(data); + return ret; +} + +static int __devexit tosa_bl_remove(struct i2c_client *client) +{ + struct tosa_bl_data *data = i2c_get_clientdata(client); + + backlight_device_unregister(data->bl); + data->bl = NULL; + i2c_set_clientdata(client, NULL); + + gpio_free(TOSA_GPIO_BL_C20MA); + + kfree(data); + + return 0; +} + +#ifdef CONFIG_PM +static int tosa_bl_suspend(struct i2c_client *client, pm_message_t pm) +{ + struct tosa_bl_data *data = i2c_get_clientdata(client); + + tosa_bl_set_backlight(data, 0); + + return 0; +} + +static int tosa_bl_resume(struct i2c_client *client) +{ + struct tosa_bl_data *data = i2c_get_clientdata(client); + + backlight_update_status(data->bl); + return 0; +} +#else +#define tosa_bl_suspend NULL +#define tosa_bl_resume NULL +#endif + +static const struct i2c_device_id tosa_bl_id[] = { + { "tosa-bl", 0 }, + { }, +}; + + +static struct i2c_driver tosa_bl_driver = { + .driver = { + .name = "tosa-bl", + .owner = THIS_MODULE, + }, + .probe = tosa_bl_probe, + .remove = __devexit_p(tosa_bl_remove), + .suspend = tosa_bl_suspend, + .resume = tosa_bl_resume, + .id_table = tosa_bl_id, +}; + +static int __init tosa_bl_init(void) +{ + return i2c_add_driver(&tosa_bl_driver); +} + +static void __exit tosa_bl_exit(void) +{ + i2c_del_driver(&tosa_bl_driver); +} + +module_init(tosa_bl_init); +module_exit(tosa_bl_exit); + +MODULE_AUTHOR("Dmitry Baryshkov"); +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("LCD/Backlight control for Sharp SL-6000 PDA"); + |