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path: root/drivers/video/backlight/ld9040.c
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Diffstat (limited to 'drivers/video/backlight/ld9040.c')
-rw-r--r--drivers/video/backlight/ld9040.c71
1 files changed, 59 insertions, 12 deletions
diff --git a/drivers/video/backlight/ld9040.c b/drivers/video/backlight/ld9040.c
index da9a5ce0ccb8..78dafc0c8fc5 100644
--- a/drivers/video/backlight/ld9040.c
+++ b/drivers/video/backlight/ld9040.c
@@ -31,6 +31,7 @@
#include <linux/lcd.h>
#include <linux/backlight.h>
#include <linux/module.h>
+#include <linux/regulator/consumer.h>
#include "ld9040_gamma.h"
@@ -53,8 +54,51 @@ struct ld9040 {
struct lcd_device *ld;
struct backlight_device *bd;
struct lcd_platform_data *lcd_pd;
+
+ struct mutex lock;
+ bool enabled;
+};
+
+static struct regulator_bulk_data supplies[] = {
+ { .supply = "vdd3", },
+ { .supply = "vci", },
};
+static void ld9040_regulator_enable(struct ld9040 *lcd)
+{
+ int ret = 0;
+ struct lcd_platform_data *pd = NULL;
+
+ pd = lcd->lcd_pd;
+ mutex_lock(&lcd->lock);
+ if (!lcd->enabled) {
+ ret = regulator_bulk_enable(ARRAY_SIZE(supplies), supplies);
+ if (ret)
+ goto out;
+
+ lcd->enabled = true;
+ }
+ mdelay(pd->power_on_delay);
+out:
+ mutex_unlock(&lcd->lock);
+}
+
+static void ld9040_regulator_disable(struct ld9040 *lcd)
+{
+ int ret = 0;
+
+ mutex_lock(&lcd->lock);
+ if (lcd->enabled) {
+ ret = regulator_bulk_disable(ARRAY_SIZE(supplies), supplies);
+ if (ret)
+ goto out;
+
+ lcd->enabled = false;
+ }
+out:
+ mutex_unlock(&lcd->lock);
+}
+
static const unsigned short seq_swreset[] = {
0x01, COMMAND_ONLY,
ENDDEF, 0x00
@@ -532,13 +576,8 @@ static int ld9040_power_on(struct ld9040 *lcd)
return -EFAULT;
}
- if (!pd->power_on) {
- dev_err(lcd->dev, "power_on is NULL.\n");
- return -EFAULT;
- } else {
- pd->power_on(lcd->ld, 1);
- mdelay(pd->power_on_delay);
- }
+ /* lcd power on */
+ ld9040_regulator_enable(lcd);
if (!pd->reset) {
dev_err(lcd->dev, "reset is NULL.\n");
@@ -582,11 +621,8 @@ static int ld9040_power_off(struct ld9040 *lcd)
mdelay(pd->power_off_delay);
- if (!pd->power_on) {
- dev_err(lcd->dev, "power_on is NULL.\n");
- return -EFAULT;
- } else
- pd->power_on(lcd->ld, 0);
+ /* lcd power off */
+ ld9040_regulator_disable(lcd);
return 0;
}
@@ -693,6 +729,14 @@ static int ld9040_probe(struct spi_device *spi)
goto out_free_lcd;
}
+ mutex_init(&lcd->lock);
+
+ ret = regulator_bulk_get(lcd->dev, ARRAY_SIZE(supplies), supplies);
+ if (ret) {
+ dev_err(lcd->dev, "Failed to get regulators: %d\n", ret);
+ goto out_free_lcd;
+ }
+
ld = lcd_device_register("ld9040", &spi->dev, lcd, &ld9040_lcd_ops);
if (IS_ERR(ld)) {
ret = PTR_ERR(ld);
@@ -739,6 +783,8 @@ static int ld9040_probe(struct spi_device *spi)
out_unregister_lcd:
lcd_device_unregister(lcd->ld);
out_free_lcd:
+ regulator_bulk_free(ARRAY_SIZE(supplies), supplies);
+
kfree(lcd);
return ret;
}
@@ -750,6 +796,7 @@ static int __devexit ld9040_remove(struct spi_device *spi)
ld9040_power(lcd, FB_BLANK_POWERDOWN);
backlight_device_unregister(lcd->bd);
lcd_device_unregister(lcd->ld);
+ regulator_bulk_free(ARRAY_SIZE(supplies), supplies);
kfree(lcd);
return 0;