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mfd: twl6040: Restructure power up and down code 

Rearrange the code path for power up and down sequence.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Peter Ujfalusi 2012-10-11 13:55:30 +02:00 committed by Samuel Ortiz
parent eae9a9c85b
commit f9be134357
1 changed files with 18 additions and 20 deletions
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38
drivers/mfd/twl6040-core.c
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@ -104,7 +104,7 @@ int twl6040_clear_bits(struct twl6040 *twl6040, unsigned int reg, u8 mask)
EXPORT_SYMBOL(twl6040_clear_bits);
/* twl6040 codec manual power-up sequence */
static int twl6040_power_up(struct twl6040 *twl6040)
static int twl6040_power_up_manual(struct twl6040 *twl6040)
{
u8 ldoctl, ncpctl, lppllctl;
int ret;
@ -158,11 +158,12 @@ ncp_err:
ldoctl &= ~(TWL6040_HSLDOENA | TWL6040_REFENA | TWL6040_OSCENA);
twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
dev_err(twl6040->dev, "manual power-up failed\n");
return ret;
}
/* twl6040 manual power-down sequence */
static void twl6040_power_down(struct twl6040 *twl6040)
static void twl6040_power_down_manual(struct twl6040 *twl6040)
{
u8 ncpctl, ldoctl, lppllctl;
@ -218,18 +219,22 @@ static irqreturn_t twl6040_naudint_handler(int irq, void *data)
return IRQ_HANDLED;
}
static int twl6040_power_up_completion(struct twl6040 *twl6040)
static int twl6040_power_up_automatic(struct twl6040 *twl6040)
{
int time_left;
u8 intid;
gpio_set_value(twl6040->audpwron, 1);
time_left = wait_for_completion_timeout(&twl6040->ready,
msecs_to_jiffies(144));
if (!time_left) {
u8 intid;
dev_warn(twl6040->dev, "timeout waiting for READYINT\n");
intid = twl6040_reg_read(twl6040, TWL6040_REG_INTID);
if (!(intid & TWL6040_READYINT)) {
dev_err(twl6040->dev,
"timeout waiting for READYINT\n");
dev_err(twl6040->dev, "automatic power-up failed\n");
gpio_set_value(twl6040->audpwron, 0);
return -ETIMEDOUT;
}
}
@ -239,7 +244,6 @@ static int twl6040_power_up_completion(struct twl6040 *twl6040)
int twl6040_power(struct twl6040 *twl6040, int on)
{
int audpwron = twl6040->audpwron;
int ret = 0;
mutex_lock(&twl6040->mutex);
@ -249,23 +253,17 @@ int twl6040_power(struct twl6040 *twl6040, int on)
if (twl6040->power_count++)
goto out;
if (gpio_is_valid(audpwron)) {
/* use AUDPWRON line */
gpio_set_value(audpwron, 1);
/* wait for power-up completion */
ret = twl6040_power_up_completion(twl6040);
if (gpio_is_valid(twl6040->audpwron)) {
/* use automatic power-up sequence */
ret = twl6040_power_up_automatic(twl6040);
if (ret) {
dev_err(twl6040->dev,
"automatic power-up failed\n");
twl6040->power_count = 0;
goto out;
}
} else {
/* use manual power-up sequence */
ret = twl6040_power_up(twl6040);
ret = twl6040_power_up_manual(twl6040);
if (ret) {
dev_err(twl6040->dev,
"manual power-up failed\n");
twl6040->power_count = 0;
goto out;
}
@ -286,15 +284,15 @@ int twl6040_power(struct twl6040 *twl6040, int on)
if (--twl6040->power_count)
goto out;
if (gpio_is_valid(audpwron)) {
if (gpio_is_valid(twl6040->audpwron)) {
/* use AUDPWRON line */
gpio_set_value(audpwron, 0);
gpio_set_value(twl6040->audpwron, 0);
/* power-down sequence latency */
usleep_range(500, 700);
} else {
/* use manual power-down sequence */
twl6040_power_down(twl6040);
twl6040_power_down_manual(twl6040);
}
twl6040->sysclk = 0;
twl6040->mclk = 0;