diff options
author | Eric Miao <eric.miao@marvell.com> | 2008-09-07 03:30:06 (GMT) |
---|---|---|
committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2008-09-25 08:38:14 (GMT) |
commit | ff7a4c7130c0ad97d55f7ab3f0a35fbc1f41b376 (patch) | |
tree | e24ccea4bdb38720511e63f2f870e84b6fb2d7ac /drivers/video/backlight | |
parent | f72de6638b8e55283739de174b57c0ae4203c446 (diff) | |
download | linux-fsl-qoriq-ff7a4c7130c0ad97d55f7ab3f0a35fbc1f41b376.tar.xz |
[ARM] corgi_lcd: use GPIO API for BACKLIGHT_ON and BACKLIGHT_CONT
Signed-off-by: Eric Miao <eric.miao@marvell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'drivers/video/backlight')
-rw-r--r-- | drivers/video/backlight/corgi_lcd.c | 83 |
1 files changed, 78 insertions, 5 deletions
diff --git a/drivers/video/backlight/corgi_lcd.c b/drivers/video/backlight/corgi_lcd.c index 068f148..2afd47e 100644 --- a/drivers/video/backlight/corgi_lcd.c +++ b/drivers/video/backlight/corgi_lcd.c @@ -19,6 +19,7 @@ #include <linux/kernel.h> #include <linux/init.h> #include <linux/delay.h> +#include <linux/gpio.h> #include <linux/fb.h> #include <linux/lcd.h> #include <linux/spi/spi.h> @@ -92,7 +93,10 @@ struct corgi_lcd { int mode; char buf[2]; - void (*notify)(int intensity); + int gpio_backlight_on; + int gpio_backlight_cont; + int gpio_backlight_cont_inverted; + void (*kick_battery)(void); }; @@ -393,18 +397,26 @@ static int corgi_bl_get_intensity(struct backlight_device *bd) static int corgi_bl_set_intensity(struct corgi_lcd *lcd, int intensity) { + int cont; + if (intensity > 0x10) intensity += 0x10; corgi_ssp_lcdtg_send(lcd, DUTYCTRL_ADRS, intensity); - lcd->intensity = intensity; - if (lcd->notify) - lcd->notify(intensity); + /* Bit 5 via GPIO_BACKLIGHT_CONT */ + cont = !!(intensity & 0x20) ^ lcd->gpio_backlight_cont_inverted; + + if (gpio_is_valid(lcd->gpio_backlight_cont)) + gpio_set_value(lcd->gpio_backlight_cont, cont); + + if (gpio_is_valid(lcd->gpio_backlight_on)) + gpio_set_value(lcd->gpio_backlight_on, intensity); if (lcd->kick_battery) lcd->kick_battery(); + lcd->intensity = intensity; return 0; } @@ -468,6 +480,56 @@ static int corgi_lcd_resume(struct spi_device *spi) #define corgi_lcd_resume NULL #endif +static int setup_gpio_backlight(struct corgi_lcd *lcd, + struct corgi_lcd_platform_data *pdata) +{ + struct spi_device *spi = lcd->spi_dev; + int err; + + lcd->gpio_backlight_on = -1; + lcd->gpio_backlight_cont = -1; + + if (gpio_is_valid(pdata->gpio_backlight_on)) { + err = gpio_request(pdata->gpio_backlight_on, "BL_ON"); + if (err) { + dev_err(&spi->dev, "failed to request GPIO%d for " + "backlight_on\n", pdata->gpio_backlight_on); + return err; + } + + lcd->gpio_backlight_on = pdata->gpio_backlight_on; + gpio_direction_output(lcd->gpio_backlight_on, 0); + } + + if (gpio_is_valid(pdata->gpio_backlight_cont)) { + err = gpio_request(pdata->gpio_backlight_cont, "BL_CONT"); + if (err) { + dev_err(&spi->dev, "failed to request GPIO%d for " + "backlight_cont\n", pdata->gpio_backlight_cont); + goto err_free_backlight_on; + } + + lcd->gpio_backlight_cont = pdata->gpio_backlight_cont; + + /* spitz and akita use both GPIOs for backlight, and + * have inverted polarity of GPIO_BACKLIGHT_CONT + */ + if (gpio_is_valid(lcd->gpio_backlight_on)) { + lcd->gpio_backlight_cont_inverted = 1; + gpio_direction_output(lcd->gpio_backlight_cont, 1); + } else { + lcd->gpio_backlight_cont_inverted = 0; + gpio_direction_output(lcd->gpio_backlight_cont, 0); + } + } + return 0; + +err_free_backlight_on: + if (gpio_is_valid(lcd->gpio_backlight_on)) + gpio_free(lcd->gpio_backlight_on); + return err; +} + static int __devinit corgi_lcd_probe(struct spi_device *spi) { struct corgi_lcd_platform_data *pdata = spi->dev.platform_data; @@ -506,7 +568,10 @@ static int __devinit corgi_lcd_probe(struct spi_device *spi) lcd->bl_dev->props.brightness = pdata->default_intensity; lcd->bl_dev->props.power = FB_BLANK_UNBLANK; - lcd->notify = pdata->notify; + ret = setup_gpio_backlight(lcd, pdata); + if (ret) + goto err_unregister_bl; + lcd->kick_battery = pdata->kick_battery; dev_set_drvdata(&spi->dev, lcd); @@ -517,6 +582,8 @@ static int __devinit corgi_lcd_probe(struct spi_device *spi) the_corgi_lcd = lcd; return 0; +err_unregister_bl: + backlight_device_unregister(lcd->bl_dev); err_unregister_lcd: lcd_device_unregister(lcd->lcd_dev); err_free_lcd: @@ -533,6 +600,12 @@ static int __devexit corgi_lcd_remove(struct spi_device *spi) backlight_update_status(lcd->bl_dev); backlight_device_unregister(lcd->bl_dev); + if (gpio_is_valid(lcd->gpio_backlight_on)) + gpio_free(lcd->gpio_backlight_on); + + if (gpio_is_valid(lcd->gpio_backlight_cont)) + gpio_free(lcd->gpio_backlight_cont); + corgi_lcd_set_power(lcd->lcd_dev, FB_BLANK_POWERDOWN); lcd_device_unregister(lcd->lcd_dev); kfree(lcd); |