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leds: lp8550: restore register values on resume

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In some cases the lp8550 is resetting on resume and
we need to restore the default values of registers a1-a7

Change-Id: I42e20d646c077008eab2a7100a731ece2bf835d8
Signed-off-by: James Wylder <james.wylder@motorola.com>
This commit is contained in:
James Wylder 2011-01-28 18:50:32 -06:00 committed by Colin Cross
parent 08d79c253d
commit a648edef46
1 changed files with 15 additions and 3 deletions
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18
drivers/leds/leds-lp8550.c
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@ -209,6 +209,8 @@ static void lp8550_brightness_write(struct lp8550_data *led_data)
{
int error = 0;
int brightness = led_data->brightness;
unsigned i, reg_addr;
uint8_t value = 0;
if (lp8550_debug)
pr_info("%s: setting brightness to %i\n",
@ -228,11 +230,21 @@ static void lp8550_brightness_write(struct lp8550_data *led_data)
if (!IS_ERR_OR_NULL(led_data->regulator))
regulator_enable(led_data->regulator);
if (lp8550_write_reg(led_data, LP8550_DEVICE_CTRL,
led_data->led_pdata->dev_ctrl_config | 0x01))
led_data->led_pdata->dev_ctrl_config | 0x01)) {
pr_err("%s:writing failed while setting brightness:%d\n",
__func__, error);
else
atomic_set(&led_data->enabled, 1);
atomic_set(&led_data->enabled, 0);
}
/* restore values a1 to a8 in case they have been reset */
/* a0 will be set below with the brightness */
for (i = 1; i < led_data->led_pdata->eeprom_tbl_sz; i++) {
reg_addr = LP8550_EEPROM_A0 + i;
value = led_data->led_pdata->eeprom_table[i].eeprom_data;
if (lp8550_write_reg(led_data, reg_addr, value))
pr_err("%s: Register initialization failed\n",
__func__);
}
}
if (led_data->led_pdata->dev_ctrl_config ==