Hi Chris,
On Mon, Dec 23, 2013 at 06:44:19PM -0800, Christopher Heiny wrote:
> This patch fixes some bugs in handling of the RMI4 attention line GPIO.
>
> 1) in enable_sensor(), eliminate the complicated check on ATTN and just
> call process_interrupt_requests(). This will have minimal overhead if ATTN
> is not asserted, and clears the state of the RMI4 device in any case.
>
> 2) Correctly free the GPIO in rmi_driver_remove().
>
> 3) in rmi_driver_probe()
> - declare the name of the attention gpio (GPIO_LABEL)
> - use gpio_request_one() to get the gpio and export it.
> - simplify conditional gpio acquisition logic and combine with interrupt
> setup
>
> 4) use gpio_is_valid() instead of comparing to 0.
>
> Signed-off-by: Christopher Heiny <[email protected]>
> Cc: Dmitry Torokhov <[email protected]>
> Cc: Benjamin Tissoires <[email protected]>
>
> ---
>
> drivers/input/rmi4/rmi_driver.c | 43
> ++++++++++++++++++++++-------------------
> 1 file changed, 23 insertions(+), 20 deletions(-)
>
> diff --git a/drivers/input/rmi4/rmi_driver.c b/drivers/input/rmi4/rmi_driver.c
> index a30c7d3..9b02358 100644
> --- a/drivers/input/rmi4/rmi_driver.c
> +++ b/drivers/input/rmi4/rmi_driver.c
> @@ -140,7 +140,6 @@ static int enable_sensor(struct rmi_device *rmi_dev)
> struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev);
> struct rmi_phys_device *rmi_phys;
> int retval = 0;
> - struct rmi_device_platform_data *pdata = to_rmi_platform_data(rmi_dev);
>
> if (data->enabled)
> return 0;
> @@ -169,11 +168,7 @@ static int enable_sensor(struct rmi_device *rmi_dev)
>
> data->enabled = true;
>
> - if (!pdata->level_triggered &&
> - gpio_get_value(pdata->attn_gpio) == pdata->attn_polarity)
> - retval = process_interrupt_requests(rmi_dev);
> -
> - return retval;
> + return process_interrupt_requests(rmi_dev);
> }
>
> static void rmi_free_function_list(struct rmi_device *rmi_dev)
> @@ -800,13 +795,20 @@ static SIMPLE_DEV_PM_OPS(rmi_driver_pm,
> rmi_driver_suspend, rmi_driver_resume);
> static int rmi_driver_remove(struct device *dev)
> {
> struct rmi_device *rmi_dev = to_rmi_device(dev);
> + const struct rmi_device_platform_data *pdata =
> + to_rmi_platform_data(rmi_dev);
>
> disable_sensor(rmi_dev);
> rmi_free_function_list(rmi_dev);
>
> + if (gpio_is_valid(pdata->attn_gpio))
> + gpio_free(pdata->attn_gpio);
It looks like you let driver registration to continue even if GPIO
request fails. You probably need to introduce a flag indicating whether
you successfully requested gpio or not. Or you can treat failure to
acquire gpio as fatal.
> +
> return 0;
> }
>
> +static const char GPIO_LABEL[] = "attn";
> +
> static int rmi_driver_probe(struct device *dev)
> {
> struct rmi_driver *rmi_driver;
> @@ -937,7 +939,7 @@ static int rmi_driver_probe(struct device *dev)
> mutex_init(&data->suspend_mutex);
> }
>
> - if (pdata->attn_gpio) {
> + if (gpio_is_valid(pdata->attn_gpio)) {
> data->irq = gpio_to_irq(pdata->attn_gpio);
> if (pdata->level_triggered) {
> data->irq_flags = IRQF_ONESHOT |
> @@ -948,24 +950,17 @@ static int rmi_driver_probe(struct device *dev)
> (pdata->attn_polarity == RMI_ATTN_ACTIVE_HIGH)
> ? IRQF_TRIGGER_RISING : IRQF_TRIGGER_FALLING;
> }
> - } else
> - data->poll_interval = ktime_set(0,
> - (pdata->poll_interval_ms ? pdata->poll_interval_ms :
> - DEFAULT_POLL_INTERVAL_MS) * 1000 * 1000);
> -
> - if (data->f01_container->dev.driver) {
> - /* Driver already bound, so enable ATTN now. */
> - enable_sensor(rmi_dev);
> - }
>
> - if (IS_ENABLED(CONFIG_RMI4_DEV) && pdata->attn_gpio) {
Do you really need to export gpio if you do not have RMI4_DEV option?
> - retval = gpio_export(pdata->attn_gpio, false);
> + retval = gpio_request_one(pdata->attn_gpio,
> + GPIOF_EXPORT | GPIOF_DIR_IN,
> + GPIO_LABEL);
> if (retval) {
> - dev_warn(dev, "WARNING: Failed to export ATTN gpio!\n");
> + dev_warn(dev, "WARNING: Failed to request ATTN gpio %d,
> code=%d.\n",
> + pdata->attn_gpio, retval);
> retval = 0;
> } else {
> retval = gpio_export_link(dev,
> - "attn", pdata->attn_gpio);
> + GPIO_LABEL, pdata->attn_gpio);
> if (retval) {
> dev_warn(dev,
> "WARNING: Failed to symlink ATTN
> gpio!\n");
> @@ -975,6 +970,14 @@ static int rmi_driver_probe(struct device *dev)
> pdata->attn_gpio);
> }
> }
> + } else
> + data->poll_interval = ktime_set(0,
> + (pdata->poll_interval_ms ? pdata->poll_interval_ms :
> + DEFAULT_POLL_INTERVAL_MS) * 1000 * 1000);
> +
> + if (data->f01_container->dev.driver) {
> + /* Driver already bound, so enable ATTN now. */
> + enable_sensor(rmi_dev);
> }
>
> return 0;
Thanks.
--
Dmitry
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