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authorRussell King <rmk+kernel@arm.linux.org.uk>2012-01-21 18:13:20 +0000
committerRussell King <rmk+kernel@arm.linux.org.uk>2012-02-18 23:15:38 +0000
commited442b6798eb39eda3bcea92ef9403280b603818 (patch)
tree4e9d701e751169e5eda8ef7ee985c29b55f16d9e /drivers/mfd/ucb1x00-core.c
parent65b539bb900f64b9a3f9b761bf0f735dc84e6b70 (diff)
MFD: ucb1x00-core: add missing ucb1x00_enable()/ucb1x00_disable()
ucb1x00_enable() and ucb1x00_disable() are used for power saving on the SIB interface, allowing the host supplied clock to be disabled when not required. We require drivers which access the ucb1x00 to ensure that they have enabled the clock prior to accessing the device, and they should disable it once they're done. As we don't expect gpiolib users to be aware of this detail, we must make these calls in the gpiolib interfaces. Add them. Also add them to the resume method, which needs to re-establish the GPIO pin settings. Acked-by: Jochen Friedrich <jochen@scram.de> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'drivers/mfd/ucb1x00-core.c')
-rw-r--r--drivers/mfd/ucb1x00-core.c16
1 files changed, 15 insertions, 1 deletions
diff --git a/drivers/mfd/ucb1x00-core.c b/drivers/mfd/ucb1x00-core.c
index 162496de1b3..9f8ea52f0ca 100644
--- a/drivers/mfd/ucb1x00-core.c
+++ b/drivers/mfd/ucb1x00-core.c
@@ -116,14 +116,22 @@ static void ucb1x00_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
else
ucb->io_out &= ~(1 << offset);
+ ucb1x00_enable(ucb);
ucb1x00_reg_write(ucb, UCB_IO_DATA, ucb->io_out);
+ ucb1x00_disable(ucb);
spin_unlock_irqrestore(&ucb->io_lock, flags);
}
static int ucb1x00_gpio_get(struct gpio_chip *chip, unsigned offset)
{
struct ucb1x00 *ucb = container_of(chip, struct ucb1x00, gpio);
- return ucb1x00_reg_read(ucb, UCB_IO_DATA) & (1 << offset);
+ unsigned val;
+
+ ucb1x00_enable(ucb);
+ val = ucb1x00_reg_read(ucb, UCB_IO_DATA);
+ ucb1x00_disable(ucb);
+
+ return val & (1 << offset);
}
static int ucb1x00_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
@@ -133,7 +141,9 @@ static int ucb1x00_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
spin_lock_irqsave(&ucb->io_lock, flags);
ucb->io_dir &= ~(1 << offset);
+ ucb1x00_enable(ucb);
ucb1x00_reg_write(ucb, UCB_IO_DIR, ucb->io_dir);
+ ucb1x00_disable(ucb);
spin_unlock_irqrestore(&ucb->io_lock, flags);
return 0;
@@ -153,6 +163,7 @@ static int ucb1x00_gpio_direction_output(struct gpio_chip *chip, unsigned offset
else
ucb->io_out &= ~mask;
+ ucb1x00_enable(ucb);
if (old != ucb->io_out)
ucb1x00_reg_write(ucb, UCB_IO_DATA, ucb->io_out);
@@ -160,6 +171,7 @@ static int ucb1x00_gpio_direction_output(struct gpio_chip *chip, unsigned offset
ucb->io_dir |= mask;
ucb1x00_reg_write(ucb, UCB_IO_DIR, ucb->io_dir);
}
+ ucb1x00_disable(ucb);
spin_unlock_irqrestore(&ucb->io_lock, flags);
return 0;
@@ -703,8 +715,10 @@ static int ucb1x00_resume(struct mcp *mcp)
struct ucb1x00 *ucb = mcp_get_drvdata(mcp);
struct ucb1x00_dev *dev;
+ ucb1x00_enable(ucb);
ucb1x00_reg_write(ucb, UCB_IO_DATA, ucb->io_out);
ucb1x00_reg_write(ucb, UCB_IO_DIR, ucb->io_dir);
+ ucb1x00_disable(ucb);
mutex_lock(&ucb1x00_mutex);
list_for_each_entry(dev, &ucb->devs, dev_node) {
if (dev->drv->resume)