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drivers/video/backlight/l4f00242t03.c: full implement fb power states for this lcd 

Complete the support of fb power states managing correctly the regulators
bound to this driver.

Signed-off-by: Alberto Panizzo <maramaopercheseimorto@gmail.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: Marek Vasut <marek.vasut@gmail.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alberto Panizzo 2011-01-12 16:59:22 -08:00 committed by Linus Torvalds
parent 5c2202f9c8
commit 95558ad15b
1 changed files with 73 additions and 20 deletions
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93
drivers/video/backlight/l4f00242t03.c
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@ -25,7 +25,7 @@
struct l4f00242t03_priv {
struct spi_device *spi;
struct lcd_device *ld;
unsigned int lcd_on:1;
int lcd_state;
struct regulator *io_reg;
struct regulator *core_reg;
};
@ -67,6 +67,29 @@ static void l4f00242t03_lcd_init(struct spi_device *spi)
spi_write(spi, (const u8 *)cmd, ARRAY_SIZE(cmd) * sizeof(u16));
}
static void l4f00242t03_lcd_powerdown(struct spi_device *spi)
{
struct l4f00242t03_pdata *pdata = spi->dev.platform_data;
struct l4f00242t03_priv *priv = dev_get_drvdata(&spi->dev);
dev_dbg(&spi->dev, "Powering down LCD\n");
gpio_set_value(pdata->data_enable_gpio, 0);
if (priv->io_reg)
regulator_disable(priv->io_reg);
if (priv->core_reg)
regulator_disable(priv->core_reg);
}
static int l4f00242t03_lcd_power_get(struct lcd_device *ld)
{
struct l4f00242t03_priv *priv = lcd_get_data(ld);
return priv->lcd_state;
}
static int l4f00242t03_lcd_power_set(struct lcd_device *ld, int power)
{
struct l4f00242t03_priv *priv = lcd_get_data(ld);
@ -79,35 +102,52 @@ static int l4f00242t03_lcd_power_set(struct lcd_device *ld, int power)
const u16 disoff = 0x28;
if (power <= FB_BLANK_NORMAL) {
if (priv->lcd_on)
return 0;
if (priv->lcd_state <= FB_BLANK_NORMAL) {
/* Do nothing, the LCD is running */
} else if (priv->lcd_state < FB_BLANK_POWERDOWN) {
dev_dbg(&spi->dev, "Resuming LCD\n");
dev_dbg(&spi->dev, "turning on LCD\n");
spi_write(spi, (const u8 *)&slpout, sizeof(u16));
msleep(60);
spi_write(spi, (const u8 *)&dison, sizeof(u16));
} else {
/* priv->lcd_state == FB_BLANK_POWERDOWN */
l4f00242t03_lcd_init(spi);
priv->lcd_state = FB_BLANK_VSYNC_SUSPEND;
l4f00242t03_lcd_power_set(priv->ld, power);
}
} else if (power < FB_BLANK_POWERDOWN) {
if (priv->lcd_state <= FB_BLANK_NORMAL) {
/* Send the display in standby */
dev_dbg(&spi->dev, "Standby the LCD\n");
spi_write(spi, (const u8 *)&slpout, sizeof(u16));
msleep(60);
spi_write(spi, (const u8 *)&dison, sizeof(u16));
priv->lcd_on = 1;
spi_write(spi, (const u8 *)&disoff, sizeof(u16));
msleep(60);
spi_write(spi, (const u8 *)&slpin, sizeof(u16));
} else if (priv->lcd_state < FB_BLANK_POWERDOWN) {
/* Do nothing, the LCD is already in standby */
} else {
/* priv->lcd_state == FB_BLANK_POWERDOWN */
l4f00242t03_lcd_init(spi);
priv->lcd_state = FB_BLANK_UNBLANK;
l4f00242t03_lcd_power_set(ld, power);
}
} else {
if (!priv->lcd_on)
return 0;
dev_dbg(&spi->dev, "turning off LCD\n");
/* power == FB_BLANK_POWERDOWN */
/* Clear the screen before shutting down */
spi_write(spi, (const u8 *)&disoff, sizeof(u16));
msleep(60);
spi_write(spi, (const u8 *)&slpin, sizeof(u16));
priv->lcd_on = 0;
l4f00242t03_lcd_powerdown(spi);
}
priv->lcd_state = power;
return 0;
}
static struct lcd_ops l4f_ops = {
.set_power = l4f00242t03_lcd_power_set,
.get_power = NULL,
.get_power = l4f00242t03_lcd_power_get,
};
static int __devinit l4f00242t03_probe(struct spi_device *spi)
@ -187,7 +227,8 @@ static int __devinit l4f00242t03_probe(struct spi_device *spi)
/* Init the LCD */
l4f00242t03_reset(pdata->reset_gpio);
l4f00242t03_lcd_init(spi);
l4f00242t03_lcd_power_set(priv->ld, 1);
priv->lcd_state = FB_BLANK_VSYNC_SUSPEND;
l4f00242t03_lcd_power_set(priv->ld, FB_BLANK_UNBLANK);
dev_info(&spi->dev, "Epson l4f00242t03 lcd probed.\n");
@ -214,9 +255,11 @@ static int __devexit l4f00242t03_remove(struct spi_device *spi)
struct l4f00242t03_priv *priv = dev_get_drvdata(&spi->dev);
struct l4f00242t03_pdata *pdata = priv->spi->dev.platform_data;
l4f00242t03_lcd_power_set(priv->ld, 0);
l4f00242t03_lcd_power_set(priv->ld, FB_BLANK_POWERDOWN);
lcd_device_unregister(priv->ld);
dev_set_drvdata(&spi->dev, NULL);
gpio_free(pdata->data_enable_gpio);
gpio_free(pdata->reset_gpio);
@ -230,6 +273,15 @@ static int __devexit l4f00242t03_remove(struct spi_device *spi)
return 0;
}
static void l4f00242t03_shutdown(struct spi_device *spi)
{
struct l4f00242t03_priv *priv = dev_get_drvdata(&spi->dev);
if (priv)
l4f00242t03_lcd_power_set(priv->ld, FB_BLANK_POWERDOWN);
}
static struct spi_driver l4f00242t03_driver = {
.driver = {
.name = "l4f00242t03",
@ -237,6 +289,7 @@ static struct spi_driver l4f00242t03_driver = {
},
.probe = l4f00242t03_probe,
.remove = __devexit_p(l4f00242t03_remove),
.shutdown = l4f00242t03_shutdown,
};
static __init int l4f00242t03_init(void)