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authorViresh Kumar <viresh.kumar@st.com>2011-11-08 09:44:06 +0530
committerSamuel Ortiz <sameo@linux.intel.com>2012-01-09 00:37:29 +0100
commit73de16db43f8dcb833ab032ed274b60b23676680 (patch)
tree235da8693adb626d93c59634c3543742d5c63907
parent42ab84fb0a3db786567158bf0006a35131714eb5 (diff)
mfd: Add support for irq over gpio pin to stmpe
On many boards, stmpe is present as an separate device (not as part of SoC). Here gpio lines are mostly used for getting interrupts. This patch adds in support to handle irq over gpio pin. Signed-off-by: Viresh Kumar <viresh.kumar@st.com> Acked-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
-rw-r--r--drivers/mfd/stmpe.c36
-rw-r--r--include/linux/mfd/stmpe.h7
2 files changed, 36 insertions, 7 deletions
diff --git a/drivers/mfd/stmpe.c b/drivers/mfd/stmpe.c
index 2963689cf45..39efa629a19 100644
--- a/drivers/mfd/stmpe.c
+++ b/drivers/mfd/stmpe.c
@@ -5,6 +5,7 @@
* Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
*/
+#include <linux/gpio.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/interrupt.h>
@@ -877,9 +878,10 @@ static int __devinit stmpe_devices_init(struct stmpe *stmpe)
static int stmpe_suspend(struct device *dev)
{
struct i2c_client *i2c = to_i2c_client(dev);
+ struct stmpe *stmpe = i2c_get_clientdata(i2c);
if (device_may_wakeup(&i2c->dev))
- enable_irq_wake(i2c->irq);
+ enable_irq_wake(stmpe->irq);
return 0;
}
@@ -887,9 +889,10 @@ static int stmpe_suspend(struct device *dev)
static int stmpe_resume(struct device *dev)
{
struct i2c_client *i2c = to_i2c_client(dev);
+ struct stmpe *stmpe = i2c_get_clientdata(i2c);
if (device_may_wakeup(&i2c->dev))
- disable_irq_wake(i2c->irq);
+ disable_irq_wake(stmpe->irq);
return 0;
}
@@ -925,15 +928,28 @@ static int __devinit stmpe_probe(struct i2c_client *i2c,
i2c_set_clientdata(i2c, stmpe);
+ if (pdata->irq_over_gpio) {
+ ret = gpio_request_one(pdata->irq_gpio, GPIOF_DIR_IN, "stmpe");
+ if (ret) {
+ dev_err(stmpe->dev, "failed to request IRQ GPIO: %d\n",
+ ret);
+ goto out_free;
+ }
+
+ stmpe->irq = gpio_to_irq(pdata->irq_gpio);
+ } else {
+ stmpe->irq = i2c->irq;
+ }
+
ret = stmpe_chip_init(stmpe);
if (ret)
- goto out_free;
+ goto free_gpio;
ret = stmpe_irq_init(stmpe);
if (ret)
- goto out_free;
+ goto free_gpio;
- ret = request_threaded_irq(stmpe->i2c->irq, NULL, stmpe_irq,
+ ret = request_threaded_irq(stmpe->irq, NULL, stmpe_irq,
pdata->irq_trigger | IRQF_ONESHOT,
"stmpe", stmpe);
if (ret) {
@@ -951,9 +967,12 @@ static int __devinit stmpe_probe(struct i2c_client *i2c,
out_removedevs:
mfd_remove_devices(stmpe->dev);
- free_irq(stmpe->i2c->irq, stmpe);
+ free_irq(stmpe->irq, stmpe);
out_removeirq:
stmpe_irq_remove(stmpe);
+free_gpio:
+ if (pdata->irq_over_gpio)
+ gpio_free(pdata->irq_gpio);
out_free:
kfree(stmpe);
return ret;
@@ -965,9 +984,12 @@ static int __devexit stmpe_remove(struct i2c_client *client)
mfd_remove_devices(stmpe->dev);
- free_irq(stmpe->i2c->irq, stmpe);
+ free_irq(stmpe->irq, stmpe);
stmpe_irq_remove(stmpe);
+ if (stmpe->pdata->irq_over_gpio)
+ gpio_free(stmpe->pdata->irq_gpio);
+
kfree(stmpe);
return 0;
diff --git a/include/linux/mfd/stmpe.h b/include/linux/mfd/stmpe.h
index be1af7c42e5..270d6613aad 100644
--- a/include/linux/mfd/stmpe.h
+++ b/include/linux/mfd/stmpe.h
@@ -61,6 +61,7 @@ struct stmpe_variant_info;
* @variant: the detected STMPE model number
* @regs: list of addresses of registers which are at different addresses on
* different variants. Indexed by one of STMPE_IDX_*.
+ * @irq: irq number for stmpe
* @irq_base: starting IRQ number for internal IRQs
* @num_gpios: number of gpios, differs for variants
* @ier: cache of IER registers for bus_lock
@@ -76,6 +77,7 @@ struct stmpe {
struct stmpe_variant_info *variant;
const u8 *regs;
+ int irq;
int irq_base;
int num_gpios;
u8 ier[2];
@@ -183,6 +185,9 @@ struct stmpe_ts_platform_data {
* @autosleep_timeout: inactivity timeout in milliseconds for autosleep
* @irq_base: base IRQ number. %STMPE_NR_IRQS irqs will be used, or
* %STMPE_NR_INTERNAL_IRQS if the GPIO driver is not used.
+ * @irq_over_gpio: true if gpio is used to get irq
+ * @irq_gpio: gpio number over which irq will be requested (significant only if
+ * irq_over_gpio is true)
* @gpio: GPIO-specific platform data
* @keypad: keypad-specific platform data
* @ts: touchscreen-specific platform data
@@ -194,6 +199,8 @@ struct stmpe_platform_data {
unsigned int irq_trigger;
bool irq_invert_polarity;
bool autosleep;
+ bool irq_over_gpio;
+ int irq_gpio;
int autosleep_timeout;
struct stmpe_gpio_platform_data *gpio;