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Input: wacom_i2c - do not use irq_to_gpio 

Because irq_to_gpio() is not available on many platforms let's switch
to level-triggered one-shot IRQs that will stay active as long as
there is data to be read.

Tested-by: Tobita Tatsunosuke <tobita.tatsunosuke@wacom.co.jp>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Dmitry Torokhov 2012-04-10 00:21:09 -07:00
parent 98a8413192
commit d568778298
1 changed files with 4 additions and 37 deletions
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41
drivers/input/touchscreen/wacom_i2c.c
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@ -39,7 +39,6 @@ struct wacom_features {
struct wacom_i2c {
struct i2c_client *client;
struct input_dev *input;
unsigned int gpio;
u8 data[WACOM_QUERY_SIZE];
};
@ -91,23 +90,6 @@ static int wacom_query_device(struct i2c_client *client,
return 0;
}
static int wacom_i2c_fetch_data(struct wacom_i2c *wac_i2c)
{
int retries = 0;
int ret;
do {
ret = i2c_master_recv(wac_i2c->client,
wac_i2c->data, sizeof(wac_i2c->data));
} while (gpio_get_value(wac_i2c->gpio) == 0 &&
retries++ < WACOM_RETRY_CNT);
if (retries >= WACOM_RETRY_CNT)
ret = -EIO;
return ret < 0 ? ret : 0;
}
static irqreturn_t wacom_i2c_irq(int irq, void *dev_id)
{
struct wacom_i2c *wac_i2c = dev_id;
@ -117,8 +99,9 @@ static irqreturn_t wacom_i2c_irq(int irq, void *dev_id)
unsigned char tsw, f1, f2, ers;
int error;
error = wacom_i2c_fetch_data(wac_i2c);
if (error)
error = i2c_master_recv(wac_i2c->client,
wac_i2c->data, sizeof(wac_i2c->data));
if (error < 0)
goto out;
tsw = data[3] & 0x01;
@ -147,12 +130,6 @@ static int wacom_i2c_open(struct input_dev *dev)
{
struct wacom_i2c *wac_i2c = input_get_drvdata(dev);
struct i2c_client *client = wac_i2c->client;
int error;
/* Clear the device buffer */
error = wacom_i2c_fetch_data(wac_i2c);
if (error)
return error;
enable_irq(client->irq);
@ -173,7 +150,6 @@ static int __devinit wacom_i2c_probe(struct i2c_client *client,
struct wacom_i2c *wac_i2c;
struct input_dev *input;
struct wacom_features features;
int gpio;
int error;
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
@ -181,14 +157,6 @@ static int __devinit wacom_i2c_probe(struct i2c_client *client,
return -EIO;
}
gpio = irq_to_gpio(client->irq);
if (gpio < 0) {
error = gpio;
dev_err(&client->dev,
"irq_to_gpio() failed, error: %d\n", error);
return error;
}
error = wacom_query_device(client, &features);
if (error)
return error;
@ -202,7 +170,6 @@ static int __devinit wacom_i2c_probe(struct i2c_client *client,
wac_i2c->client = client;
wac_i2c->input = input;
wac_i2c->gpio = gpio;
input->name = "Wacom I2C Digitizer";
input->id.bustype = BUS_I2C;
@ -228,7 +195,7 @@ static int __devinit wacom_i2c_probe(struct i2c_client *client,
input_set_drvdata(input, wac_i2c);
error = request_threaded_irq(client->irq, NULL, wacom_i2c_irq,
IRQF_TRIGGER_FALLING,
IRQF_TRIGGER_LOW | IRQF_ONESHOT,
"wacom_i2c", wac_i2c);
if (error) {
dev_err(&client->dev,