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pm2301-charger: Resolve I2C detection problem on ab9540

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Signed-off-by: Mustapha Ben Zoubeir <mustapha.ben.zoubeir-nonst@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>
Tested-by: Olivier CLERGEAUD <olivier.clergeaud@stericsson.com>
This commit is contained in:
Mustapha Ben Zoubeir 2012-06-27 15:40:58 +02:00 committed by Lee Jones
parent 54fbbb6242
commit 49fddeec9f
1 changed files with 26 additions and 9 deletions
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35
drivers/power/pm2301_charger.c
View file

@ -34,6 +34,8 @@
#define to_pm2xxx_charger_ac_device_info(x) container_of((x), \
struct pm2xxx_charger, ac_chg)
#define SLEEP_MIN 50
#define SLEEP_MAX 100
static int pm2xxx_interrupt_registers[] = {
PM2XXX_REG_INT1,
@ -113,17 +115,14 @@ static const struct i2c_device_id pm2xxx_ident[] = {
static void set_lpn_pin(struct pm2xxx_charger *pm2)
{
if (pm2->ac.charger_connected)
return;
gpio_set_value(pm2->lpn_pin, 1);
usleep_range(SLEEP_MIN, SLEEP_MAX);
return;
}
static void clear_lpn_pin(struct pm2xxx_charger *pm2)
{
if (pm2->ac.charger_connected)
return;
gpio_set_value(pm2->lpn_pin, 0);
return;
@ -139,7 +138,6 @@ static int pm2xxx_reg_read(struct pm2xxx_charger *pm2, int reg, u8 *val)
* and receive I2C "acknowledge" from PM2301.
*/
mutex_lock(&pm2->lock);
set_lpn_pin(pm2);
ret = i2c_smbus_read_i2c_block_data(pm2->config.pm2xxx_i2c, reg,
1, val);
@ -147,7 +145,6 @@ 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;
clear_lpn_pin(pm2);
mutex_unlock(&pm2->lock);
return ret;
@ -163,7 +160,6 @@ static int pm2xxx_reg_write(struct pm2xxx_charger *pm2, int reg, u8 val)
* and receive I2C "acknowledge" from PM2301.
*/
mutex_lock(&pm2->lock);
set_lpn_pin(pm2);
ret = i2c_smbus_write_i2c_block_data(pm2->config.pm2xxx_i2c, reg,
1, &val);
@ -171,7 +167,6 @@ 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;
clear_lpn_pin(pm2);
mutex_unlock(&pm2->lock);
return ret;
@ -478,7 +473,6 @@ static int pm2_int_reg5(void *pm2_data, int val)
struct pm2xxx_charger *pm2 = pm2_data;
int ret = 0;
if (val & (PM2XXX_INT6_ITVPWR2DROP | PM2XXX_INT6_ITVPWR1DROP)) {
dev_dbg(pm2->dev, "VMPWR drop to VBAT level\n");
}
@ -899,12 +893,34 @@ static struct pm2xxx_irq pm2xxx_charger_irq[] = {
static int pm2xxx_wall_charger_resume(struct i2c_client *i2c_client)
{
struct pm2xxx_charger *pm2;
pm2 = (struct pm2xxx_charger *)i2c_get_clientdata(i2c_client);
set_lpn_pin(pm2);
/* If we still have a HW failure, schedule a new check */
if (pm2->flags.ovv)
queue_delayed_work(pm2->charger_wq,
&pm2->check_hw_failure_work, 0);
return 0;
}
static int pm2xxx_wall_charger_suspend(struct i2c_client *i2c_client,
pm_message_t state)
{
struct pm2xxx_charger *pm2;
pm2 = (struct pm2xxx_charger *)i2c_get_clientdata(i2c_client);
clear_lpn_pin(pm2);
/* Cancel any pending HW failure check */
if (delayed_work_pending(&pm2->check_hw_failure_work))
cancel_delayed_work(&pm2->check_hw_failure_work);
flush_work(&pm2->ac_work);
flush_work(&pm2->check_main_thermal_prot_work);
return 0;
}
@ -1056,6 +1072,7 @@ static int pm2xxx_wall_charger_probe(struct i2c_client *i2c_client,
goto free_gpio;
}
set_lpn_pin(pm2);
ret = pm2xxx_charger_detection(pm2, &val);
if ((ret == 0) && val) {