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authorChris Blair <chris.blair@stericsson.com>2012-01-26 22:17:15 +0100
committerSamuel Ortiz <sameo@linux.intel.com>2012-03-06 18:46:38 +0100
commit38040c858cbd4c06080e7d1e79e9ff4c74c33d2c (patch)
tree12d6a0ca7cf6cfbd2781c11d685e9aeb152c1d83 /drivers/gpio
parente31f9b826486c48f20e4f1066aa3e23e111c3a4e (diff)
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gpio: Support no-irq stmpe mode
Adds support for boards which have an STMPE GPIO device without the interrupt pin connected. This means that no interrupt can be received but the GPIO pins can still be driven and read. Cc: Grant Likely <grant.likely@secretlab.ca> Acked-by: Viresh Kumar <viresh.kumar@st.com> Tested-by: Michel Jaouen <michel.jaouen@stericsson.com> Signed-off-by: Chris Blair <chris.blair@stericsson.com> Acked-by: Viresh Kumar <viresh.kumar@st.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Diffstat (limited to 'drivers/gpio')
-rw-r--r--drivers/gpio/gpio-stmpe.c41
1 files changed, 25 insertions, 16 deletions
diff --git a/drivers/gpio/gpio-stmpe.c b/drivers/gpio/gpio-stmpe.c
index 87a68a896abf..094c5c4fd7f2 100644
--- a/drivers/gpio/gpio-stmpe.c
+++ b/drivers/gpio/gpio-stmpe.c
@@ -307,13 +307,11 @@ static int __devinit stmpe_gpio_probe(struct platform_device *pdev)
struct stmpe_gpio_platform_data *pdata;
struct stmpe_gpio *stmpe_gpio;
int ret;
- int irq;
+ int irq = 0;
pdata = stmpe->pdata->gpio;
irq = platform_get_irq(pdev, 0);
- if (irq < 0)
- return irq;
stmpe_gpio = kzalloc(sizeof(struct stmpe_gpio), GFP_KERNEL);
if (!stmpe_gpio)
@@ -330,21 +328,28 @@ static int __devinit stmpe_gpio_probe(struct platform_device *pdev)
stmpe_gpio->chip.dev = &pdev->dev;
stmpe_gpio->chip.base = pdata ? pdata->gpio_base : -1;
- stmpe_gpio->irq_base = stmpe->irq_base + STMPE_INT_GPIO(0);
+ if (irq >= 0)
+ stmpe_gpio->irq_base = stmpe->irq_base + STMPE_INT_GPIO(0);
+ else
+ dev_info(&pdev->dev,
+ "device configured in no-irq mode; "
+ "irqs are not available\n");
ret = stmpe_enable(stmpe, STMPE_BLOCK_GPIO);
if (ret)
goto out_free;
- ret = stmpe_gpio_irq_init(stmpe_gpio);
- if (ret)
- goto out_disable;
+ if (irq >= 0) {
+ ret = stmpe_gpio_irq_init(stmpe_gpio);
+ if (ret)
+ goto out_disable;
- ret = request_threaded_irq(irq, NULL, stmpe_gpio_irq, IRQF_ONESHOT,
- "stmpe-gpio", stmpe_gpio);
- if (ret) {
- dev_err(&pdev->dev, "unable to get irq: %d\n", ret);
- goto out_removeirq;
+ ret = request_threaded_irq(irq, NULL, stmpe_gpio_irq,
+ IRQF_ONESHOT, "stmpe-gpio", stmpe_gpio);
+ if (ret) {
+ dev_err(&pdev->dev, "unable to get irq: %d\n", ret);
+ goto out_removeirq;
+ }
}
ret = gpiochip_add(&stmpe_gpio->chip);
@@ -361,9 +366,11 @@ static int __devinit stmpe_gpio_probe(struct platform_device *pdev)
return 0;
out_freeirq:
- free_irq(irq, stmpe_gpio);
+ if (irq >= 0)
+ free_irq(irq, stmpe_gpio);
out_removeirq:
- stmpe_gpio_irq_remove(stmpe_gpio);
+ if (irq >= 0)
+ stmpe_gpio_irq_remove(stmpe_gpio);
out_disable:
stmpe_disable(stmpe, STMPE_BLOCK_GPIO);
out_free:
@@ -391,8 +398,10 @@ static int __devexit stmpe_gpio_remove(struct platform_device *pdev)
stmpe_disable(stmpe, STMPE_BLOCK_GPIO);
- free_irq(irq, stmpe_gpio);
- stmpe_gpio_irq_remove(stmpe_gpio);
+ if (irq >= 0) {
+ free_irq(irq, stmpe_gpio);
+ stmpe_gpio_irq_remove(stmpe_gpio);
+ }
platform_set_drvdata(pdev, NULL);
kfree(stmpe_gpio);