diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/video/backlight/l4f00242t03.c | 97 |
1 files changed, 75 insertions, 22 deletions
diff --git a/drivers/video/backlight/l4f00242t03.c b/drivers/video/backlight/l4f00242t03.c index 6d9ba0e2b0c..5d25743bf8e 100644 --- a/drivers/video/backlight/l4f00242t03.c +++ b/drivers/video/backlight/l4f00242t03.c @@ -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; - - 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)); - - priv->lcd_on = 1; + 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"); + + 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 *)&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) |