diff options
author | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2012-04-10 11:21:09 +0400 |
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committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2012-04-10 11:42:15 +0400 |
commit | d568778298f58330bcc8cc23845676d1143c8d33 (patch) | |
tree | 962ea1b760596b54a88e0604855c548a23d6bd05 /drivers/input | |
parent | 98a84131926ebafe868c65631b69d4912922211e (diff) | |
download | linux-d568778298f58330bcc8cc23845676d1143c8d33.tar.xz |
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>
Diffstat (limited to 'drivers/input')
-rw-r--r-- | drivers/input/touchscreen/wacom_i2c.c | 41 |
1 files changed, 4 insertions, 37 deletions
diff --git a/drivers/input/touchscreen/wacom_i2c.c b/drivers/input/touchscreen/wacom_i2c.c index b8ca4a6bc91a..35572575d34a 100644 --- a/drivers/input/touchscreen/wacom_i2c.c +++ b/drivers/input/touchscreen/wacom_i2c.c @@ -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, |