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[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>
This commit is contained in:
Eric Miao 2008-09-07 11:30:06 +08:00 committed by Russell King
parent f72de6638b
commit ff7a4c7130
4 changed files with 90 additions and 28 deletions
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9
arch/arm/mach-pxa/corgi.c
View File

@ -444,12 +444,6 @@ static struct pxa2xx_spi_chip corgi_ads7846_chip = {
.cs_control = corgi_ads7846_cs,
};
static void corgi_notify_intensity(int intensity)
{
/* Bit 5 is via SCOOP */
gpio_set_value(CORGI_GPIO_BACKLIGHT_CONT, !!(intensity & 0x0020));
}
static void corgi_bl_kick_battery(void)
{
void (*kick_batt)(void);
@ -466,7 +460,8 @@ static struct corgi_lcd_platform_data corgi_lcdcon_info = {
.max_intensity = 0x2f,
.default_intensity = 0x1f,
.limit_mask = 0x0b,
.notify = corgi_notify_intensity,
.gpio_backlight_cont = CORGI_GPIO_BACKLIGHT_CONT,
.gpio_backlight_on = -1,
.kick_battery = corgi_bl_kick_battery,
};

23
arch/arm/mach-pxa/spitz.c
View File

@ -305,21 +305,6 @@ static struct pxa2xx_spi_chip spitz_ads7846_chip = {
.cs_control = spitz_ads7846_cs,
};
static void spitz_notify_intensity(int intensity)
{
if (machine_is_spitz() || machine_is_borzoi()) {
gpio_set_value(SPITZ_GPIO_BACKLIGHT_CONT, !(intensity & 0x20));
gpio_set_value(SPITZ_GPIO_BACKLIGHT_ON, intensity);
return;
}
if (machine_is_akita()) {
gpio_set_value(AKITA_GPIO_BACKLIGHT_CONT, !(intensity & 0x20));
gpio_set_value(AKITA_GPIO_BACKLIGHT_ON, intensity);
return;
}
}
static void spitz_bl_kick_battery(void)
{
void (*kick_batt)(void);
@ -336,7 +321,8 @@ static struct corgi_lcd_platform_data spitz_lcdcon_info = {
.max_intensity = 0x2f,
.default_intensity = 0x1f,
.limit_mask = 0x0b,
.notify = spitz_notify_intensity,
.gpio_backlight_cont = SPITZ_GPIO_BACKLIGHT_CONT,
.gpio_backlight_on = SPITZ_GPIO_BACKLIGHT_ON,
.kick_battery = spitz_bl_kick_battery,
};
@ -399,6 +385,11 @@ static void __init spitz_init_spi(void)
if (err)
goto err_free_2;
if (machine_is_akita()) {
spitz_lcdcon_info.gpio_backlight_cont = AKITA_GPIO_BACKLIGHT_CONT;
spitz_lcdcon_info.gpio_backlight_on = AKITA_GPIO_BACKLIGHT_ON;
}
pxa2xx_set_spi_info(2, &spitz_spi_info);
spi_register_board_info(ARRAY_AND_SIZE(spitz_spi_devices));
return;

83
drivers/video/backlight/corgi_lcd.c
View File

@ -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);

3
include/linux/spi/corgi_lcd.h
View File

@ -10,6 +10,9 @@ struct corgi_lcd_platform_data {
int default_intensity;
int limit_mask;
int gpio_backlight_on; /* -1 if n/a */
int gpio_backlight_cont; /* -1 if n/a */
void (*notify)(int intensity);
void (*kick_battery)(void);
};