| Message ID | 20210308215508.399362-1-andy.shevchenko@gmail.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | [v2,1/2] Input: tsc2007 - convert to GPIO descriptors | expand |
On Mon, Mar 08, 2021 at 11:55:07PM +0200, Andy Shevchenko wrote: > This converts the driver to use GPIO descriptors. > > Note that it now uses logical polarity and thus nagation has been dropped. > > Signed-off-by: Andy Shevchenko <andy.shevchenko@gmail.com> > --- > v2: dropped negation (Dmitry) > drivers/input/touchscreen/tsc2007.h | 4 +++- > drivers/input/touchscreen/tsc2007_core.c | 17 ++++++++--------- > 2 files changed, 11 insertions(+), 10 deletions(-) > > diff --git a/drivers/input/touchscreen/tsc2007.h b/drivers/input/touchscreen/tsc2007.h > index 91c60bf6dcaf..69b08dd6c8df 100644 > --- a/drivers/input/touchscreen/tsc2007.h > +++ b/drivers/input/touchscreen/tsc2007.h > @@ -19,6 +19,8 @@ > #ifndef _TSC2007_H > #define _TSC2007_H > > +struct gpio_desc; > + > #define TSC2007_MEASURE_TEMP0 (0x0 << 4) > #define TSC2007_MEASURE_AUX (0x2 << 4) > #define TSC2007_MEASURE_TEMP1 (0x4 << 4) > @@ -69,7 +71,7 @@ struct tsc2007 { > int fuzzy; > int fuzzz; > > - unsigned int gpio; > + struct gpio_desc *gpiod; > int irq; > > wait_queue_head_t wait; > diff --git a/drivers/input/touchscreen/tsc2007_core.c b/drivers/input/touchscreen/tsc2007_core.c > index 3b80abfc1eca..eecd10effb56 100644 > --- a/drivers/input/touchscreen/tsc2007_core.c > +++ b/drivers/input/touchscreen/tsc2007_core.c > @@ -19,11 +19,11 @@ > > #include <linux/module.h> > #include <linux/slab.h> > +#include <linux/gpio/consumer.h> > #include <linux/input.h> > #include <linux/interrupt.h> > #include <linux/i2c.h> > #include <linux/of_device.h> > -#include <linux/of_gpio.h> > #include <linux/platform_data/tsc2007.h> > #include "tsc2007.h" > > @@ -226,11 +226,12 @@ static int tsc2007_get_pendown_state_gpio(struct device *dev) > struct i2c_client *client = to_i2c_client(dev); > struct tsc2007 *ts = i2c_get_clientdata(client); > > - return !gpio_get_value(ts->gpio); > + return gpiod_get_value(ts->gpiod); > } > > static int tsc2007_probe_dt(struct i2c_client *client, struct tsc2007 *ts) > { > + struct device *dev = &client->dev; > struct device_node *np = client->dev.of_node; > u32 val32; > u64 val64; > @@ -266,13 +267,11 @@ static int tsc2007_probe_dt(struct i2c_client *client, struct tsc2007 *ts) > return -EINVAL; > } > > - ts->gpio = of_get_gpio(np, 0); > - if (gpio_is_valid(ts->gpio)) > - ts->get_pendown_state = tsc2007_get_pendown_state_gpio; > - else > - dev_warn(&client->dev, > - "GPIO not specified in DT (of_get_gpio returned %d)\n", > - ts->gpio); > + ts->gpiod = devm_gpiod_get_optional(dev, NULL, GPIOD_IN); > + if (IS_ERR(ts->gpiod)) > + return PTR_ERR(ts->gpiod); > + > + ts->get_pendown_state = tsc2007_get_pendown_state_gpio; OK, I know what my concern was here. You are now assigning ts->get_pendown_state unconditionally, and with ts->gpiod being NULL it will always return false, whereas the old code would skip setting ts->get_pendown_state when GPIO is not available, and the driver would assume that on interrupt the pen is actually down. Thanks.
On Tue, Mar 9, 2021 at 12:27 AM Dmitry Torokhov <dmitry.torokhov@gmail.com> wrote: > On Mon, Mar 08, 2021 at 11:55:07PM +0200, Andy Shevchenko wrote: ... > > + ts->get_pendown_state = tsc2007_get_pendown_state_gpio; > > OK, I know what my concern was here. You are now assigning > ts->get_pendown_state unconditionally, and with ts->gpiod being NULL it > will always return false, whereas the old code would skip setting > ts->get_pendown_state when GPIO is not available, and the driver would > assume that on interrupt the pen is actually down. Good catch! I fixed this in v3 (left original conditional, if we want to drop the warning, then we may do it in a separate change).
diff --git a/drivers/input/touchscreen/tsc2007.h b/drivers/input/touchscreen/tsc2007.h index 91c60bf6dcaf..69b08dd6c8df 100644 --- a/drivers/input/touchscreen/tsc2007.h +++ b/drivers/input/touchscreen/tsc2007.h @@ -19,6 +19,8 @@ #ifndef _TSC2007_H #define _TSC2007_H +struct gpio_desc; + #define TSC2007_MEASURE_TEMP0 (0x0 << 4) #define TSC2007_MEASURE_AUX (0x2 << 4) #define TSC2007_MEASURE_TEMP1 (0x4 << 4) @@ -69,7 +71,7 @@ struct tsc2007 { int fuzzy; int fuzzz; - unsigned int gpio; + struct gpio_desc *gpiod; int irq; wait_queue_head_t wait; diff --git a/drivers/input/touchscreen/tsc2007_core.c b/drivers/input/touchscreen/tsc2007_core.c index 3b80abfc1eca..eecd10effb56 100644 --- a/drivers/input/touchscreen/tsc2007_core.c +++ b/drivers/input/touchscreen/tsc2007_core.c @@ -19,11 +19,11 @@ #include <linux/module.h> #include <linux/slab.h> +#include <linux/gpio/consumer.h> #include <linux/input.h> #include <linux/interrupt.h> #include <linux/i2c.h> #include <linux/of_device.h> -#include <linux/of_gpio.h> #include <linux/platform_data/tsc2007.h> #include "tsc2007.h" @@ -226,11 +226,12 @@ static int tsc2007_get_pendown_state_gpio(struct device *dev) struct i2c_client *client = to_i2c_client(dev); struct tsc2007 *ts = i2c_get_clientdata(client); - return !gpio_get_value(ts->gpio); + return gpiod_get_value(ts->gpiod); } static int tsc2007_probe_dt(struct i2c_client *client, struct tsc2007 *ts) { + struct device *dev = &client->dev; struct device_node *np = client->dev.of_node; u32 val32; u64 val64; @@ -266,13 +267,11 @@ static int tsc2007_probe_dt(struct i2c_client *client, struct tsc2007 *ts) return -EINVAL; } - ts->gpio = of_get_gpio(np, 0); - if (gpio_is_valid(ts->gpio)) - ts->get_pendown_state = tsc2007_get_pendown_state_gpio; - else - dev_warn(&client->dev, - "GPIO not specified in DT (of_get_gpio returned %d)\n", - ts->gpio); + ts->gpiod = devm_gpiod_get_optional(dev, NULL, GPIOD_IN); + if (IS_ERR(ts->gpiod)) + return PTR_ERR(ts->gpiod); + + ts->get_pendown_state = tsc2007_get_pendown_state_gpio; return 0; }
This converts the driver to use GPIO descriptors. Note that it now uses logical polarity and thus nagation has been dropped. Signed-off-by: Andy Shevchenko <andy.shevchenko@gmail.com> --- v2: dropped negation (Dmitry) drivers/input/touchscreen/tsc2007.h | 4 +++- drivers/input/touchscreen/tsc2007_core.c | 17 ++++++++--------- 2 files changed, 11 insertions(+), 10 deletions(-)