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pm2301-charger: Wake device on register access

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When USB  Dedicated or Standard host chargers are plugged into
the device, chargealg attempts to disable the PM2301 AC charger,
However, disabling PM2301 was failing because of it being in
runtime suepend mode & LPN pin being low.

Signed-off-by: Rupesh Kumar <rupesh.kumar@stericsson.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Reviewed-by: Marcus COOPER <marcus.xm.cooper@stericsson.com>
Reviewed-by: Philippe LANGLAIS <philippe.langlais@stericsson.com>
This commit is contained in:
Rupesh Kumar 2012-12-05 14:14:13 +05:30 committed by Lee Jones
parent 7a2cf9bacf
commit b64f51c4ad
1 changed files with 6 additions and 16 deletions
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22
drivers/power/pm2301_charger.c
View file

@ -128,13 +128,9 @@ static void clear_lpn_pin(struct pm2xxx_charger *pm2)
static int pm2xxx_reg_read(struct pm2xxx_charger *pm2, int reg, u8 *val)
{
int ret;
/*
* When AC adaptor is unplugged, the host
* must put LPN high to be able to
* communicate by I2C with PM2301
* and receive I2C "acknowledge" from PM2301.
*/
mutex_lock(&pm2->lock);
/* wake up the device */
pm_runtime_get_sync(pm2->dev);
ret = i2c_smbus_read_i2c_block_data(pm2->config.pm2xxx_i2c, reg,
1, val);
@ -142,7 +138,6 @@ static int pm2xxx_reg_read(struct pm2xxx_charger *pm2, int reg, u8 *val)
dev_err(pm2->dev, "Error reading register at 0x%x\n", reg);
else
ret = 0;
mutex_unlock(&pm2->lock);
return ret;
}
@ -150,13 +145,9 @@ static int pm2xxx_reg_read(struct pm2xxx_charger *pm2, int reg, u8 *val)
static int pm2xxx_reg_write(struct pm2xxx_charger *pm2, int reg, u8 val)
{
int ret;
/*
* When AC adaptor is unplugged, the host
* must put LPN high to be able to
* communicate by I2C with PM2301
* and receive I2C "acknowledge" from PM2301.
*/
mutex_lock(&pm2->lock);
/* wake up the device */
pm_runtime_get_sync(pm2->dev);
ret = i2c_smbus_write_i2c_block_data(pm2->config.pm2xxx_i2c, reg,
1, &val);
@ -164,7 +155,6 @@ static int pm2xxx_reg_write(struct pm2xxx_charger *pm2, int reg, u8 val)
dev_err(pm2->dev, "Error writing register at 0x%x\n", reg);
else
ret = 0;
mutex_unlock(&pm2->lock);
return ret;
}