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pca953x: pca953x driver fixes for x86 mrst 

Our Moorestown platform has two max7315 chips which is covered by pca953x
i2c gpio driver.

A while ago this driver got updated with nested irq thread support, and it
broke the compatibity with "request_irq".  For example, the gpio_keys.c
driver can not work with this driver now.  This patch fixes the issue by
switching to generic_handle_irq.

Also fix the irq_base issue: irq_base == 0 is valid, and a "-1" value
should mean invalid. IRQ 0 is not a valid IRQ, irq_base of 0 is valid.

Signed-off-by: Alek Du <alek.du@intel.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alek Du 2010-10-26 14:22:41 -07:00 коммит произвёл Linus Torvalds
Родитель 2e85c4ddd3
Коммит 8a233f01b7
1 изменённых файлов: 7 добавлений и 6 удалений
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13
drivers/gpio/pca953x.c
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@ -345,7 +345,7 @@ static irqreturn_t pca953x_irq_handler(int irq, void *devid)
do {
level = __ffs(pending);
handle_nested_irq(level + chip->irq_base);
generic_handle_irq(level + chip->irq_base);
pending &= ~(1 << level);
} while (pending);
@ -360,7 +360,8 @@ static int pca953x_irq_setup(struct pca953x_chip *chip,
struct pca953x_platform_data *pdata = client->dev.platform_data;
int ret;
if (pdata->irq_base && (id->driver_data & PCA953X_INT)) {
if (pdata->irq_base != -1
&& (id->driver_data & PCA953X_INT)) {
int lvl;
ret = pca953x_read_reg(chip, PCA953X_INPUT,
@ -383,7 +384,6 @@ static int pca953x_irq_setup(struct pca953x_chip *chip,
set_irq_chip_data(irq, chip);
set_irq_chip_and_handler(irq, &pca953x_irq_chip,
handle_edge_irq);
set_irq_nested_thread(irq, 1);
#ifdef CONFIG_ARM
set_irq_flags(irq, IRQF_VALID);
#else
@ -394,6 +394,7 @@ static int pca953x_irq_setup(struct pca953x_chip *chip,
ret = request_threaded_irq(client->irq,
NULL,
pca953x_irq_handler,
IRQF_TRIGGER_RISING |
IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
dev_name(&client->dev), chip);
if (ret) {
@ -408,13 +409,13 @@ static int pca953x_irq_setup(struct pca953x_chip *chip,
return 0;
out_failed:
chip->irq_base = 0;
chip->irq_base = -1;
return ret;
}
static void pca953x_irq_teardown(struct pca953x_chip *chip)
{
if (chip->irq_base)
if (chip->irq_base != -1)
free_irq(chip->client->irq, chip);
}
#else /* CONFIG_GPIO_PCA953X_IRQ */
@ -424,7 +425,7 @@ static int pca953x_irq_setup(struct pca953x_chip *chip,
struct i2c_client *client = chip->client;
struct pca953x_platform_data *pdata = client->dev.platform_data;
if (pdata->irq_base && (id->driver_data & PCA953X_INT))
if (pdata->irq_base != -1 && (id->driver_data & PCA953X_INT))
dev_warn(&client->dev, "interrupt support not compiled in\n");
return 0;