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Date: Mon, 30 May 2022 10:11:09 +0000
From: "Hennerich, Michael" <Michael.Hennerich@...log.com>
To: Dmitry Torokhov <dmitry.torokhov@...il.com>
CC: Uwe Kleine-König
<u.kleine-koenig@...gutronix.de>,
"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 3/4] Input: adp5588-keys - switch to using managed
resources
> -----Original Message-----
> From: Dmitry Torokhov <dmitry.torokhov@...il.com>
> Sent: Samstag, 28. Mai 2022 06:57
> To: Hennerich, Michael <Michael.Hennerich@...log.com>
> Cc: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>; linux-
> input@...r.kernel.org; linux-kernel@...r.kernel.org
> Subject: [PATCH 3/4] Input: adp5588-keys - switch to using managed resources
>
>
> This simplifies error handling in probe() and reduces amount of explicit code in
> remove().
>
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
Acked-by: Michael Hennerich <michael.hennerich@...log.com>
> ---
> drivers/input/keyboard/adp5588-keys.c | 111 +++++++++++---------------
> 1 file changed, 45 insertions(+), 66 deletions(-)
>
> diff --git a/drivers/input/keyboard/adp5588-keys.c
> b/drivers/input/keyboard/adp5588-keys.c
> index ac21873ba1d7..df84a2998ed2 100644
> --- a/drivers/input/keyboard/adp5588-keys.c
> +++ b/drivers/input/keyboard/adp5588-keys.c
> @@ -182,6 +182,21 @@ static int adp5588_build_gpiomap(struct
> adp5588_kpad *kpad,
> return n_unused;
> }
>
> +static void adp5588_gpio_do_teardown(void *_kpad) {
> + struct adp5588_kpad *kpad = _kpad;
> + struct device *dev = &kpad->client->dev;
> + const struct adp5588_kpad_platform_data *pdata =
> dev_get_platdata(dev);
> + const struct adp5588_gpio_platform_data *gpio_data = pdata-
> >gpio_data;
> + int error;
> +
> + error = gpio_data->teardown(kpad->client,
> + kpad->gc.base, kpad->gc.ngpio,
> + gpio_data->context);
> + if (error)
> + dev_warn(&kpad->client->dev, "teardown failed %d\n", error);
> }
> +
> static int adp5588_gpio_add(struct adp5588_kpad *kpad) {
> struct device *dev = &kpad->client->dev; @@ -198,8 +213,6 @@ static
> int adp5588_gpio_add(struct adp5588_kpad *kpad)
> return 0;
> }
>
> - kpad->export_gpio = true;
> -
> kpad->gc.direction_input = adp5588_gpio_direction_input;
> kpad->gc.direction_output = adp5588_gpio_direction_output;
> kpad->gc.get = adp5588_gpio_get_value; @@ -213,9 +226,9 @@ static
> int adp5588_gpio_add(struct adp5588_kpad *kpad)
>
> mutex_init(&kpad->gpio_lock);
>
> - error = gpiochip_add_data(&kpad->gc, kpad);
> + error = devm_gpiochip_add_data(dev, &kpad->gc, kpad);
> if (error) {
> - dev_err(dev, "gpiochip_add failed, err: %d\n", error);
> + dev_err(dev, "gpiochip_add failed: %d\n", error);
> return error;
> }
>
> @@ -230,41 +243,24 @@ static int adp5588_gpio_add(struct adp5588_kpad
> *kpad)
> kpad->gc.base, kpad->gc.ngpio,
> gpio_data->context);
> if (error)
> - dev_warn(dev, "setup failed, %d\n", error);
> + dev_warn(dev, "setup failed: %d\n", error);
> }
>
> - return 0;
> -}
> -
> -static void adp5588_gpio_remove(struct adp5588_kpad *kpad) -{
> - struct device *dev = &kpad->client->dev;
> - const struct adp5588_kpad_platform_data *pdata =
> dev_get_platdata(dev);
> - const struct adp5588_gpio_platform_data *gpio_data = pdata-
> >gpio_data;
> - int error;
> -
> - if (!kpad->export_gpio)
> - return;
> -
> if (gpio_data->teardown) {
> - error = gpio_data->teardown(kpad->client,
> - kpad->gc.base, kpad->gc.ngpio,
> - gpio_data->context);
> + error = devm_add_action(dev, adp5588_gpio_do_teardown,
> kpad);
> if (error)
> - dev_warn(dev, "teardown failed %d\n", error);
> + dev_warn(dev, "failed to schedule teardown: %d\n",
> + error);
> }
>
> - gpiochip_remove(&kpad->gc);
> + return 0;
> }
> +
> #else
> static inline int adp5588_gpio_add(struct adp5588_kpad *kpad) {
> return 0;
> }
> -
> -static inline void adp5588_gpio_remove(struct adp5588_kpad *kpad) -{ -}
> #endif
>
> static void adp5588_report_events(struct adp5588_kpad *kpad, int ev_cnt)
> @@ -510,21 +506,20 @@ static int adp5588_probe(struct i2c_client *client,
> return -EINVAL;
> }
>
> - kpad = kzalloc(sizeof(*kpad), GFP_KERNEL);
> - input = input_allocate_device();
> - if (!kpad || !input) {
> - error = -ENOMEM;
> - goto err_free_mem;
> - }
> + kpad = devm_kzalloc(&client->dev, sizeof(*kpad), GFP_KERNEL);
> + if (!kpad)
> + return -ENOMEM;
> +
> + input = devm_input_allocate_device(&client->dev);
> + if (!input)
> + return -ENOMEM;
>
> kpad->client = client;
> kpad->input = input;
>
> ret = adp5588_read(client, DEV_ID);
> - if (ret < 0) {
> - error = ret;
> - goto err_free_mem;
> - }
> + if (ret < 0)
> + return ret;
>
> revid = (u8) ret & ADP5588_DEVICE_ID_MASK;
> if (WA_DELAYED_READOUT_REVID(revid))
> @@ -532,7 +527,6 @@ static int adp5588_probe(struct i2c_client *client,
>
> input->name = client->name;
> input->phys = "adp5588-keys/input0";
> - input->dev.parent = &client->dev;
>
> input_set_drvdata(input, kpad);
>
> @@ -569,58 +563,43 @@ static int adp5588_probe(struct i2c_client *client,
>
> error = input_register_device(input);
> if (error) {
> - dev_err(&client->dev, "unable to register input device\n");
> - goto err_free_mem;
> + dev_err(&client->dev, "unable to register input device: %d\n",
> + error);
> + return error;
> }
>
> - error = request_threaded_irq(client->irq,
> - adp5588_hard_irq, adp5588_thread_irq,
> - IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
> - client->dev.driver->name, kpad);
> + error = devm_request_threaded_irq(&client->dev, client->irq,
> + adp5588_hard_irq,
> adp5588_thread_irq,
> + IRQF_TRIGGER_FALLING |
> IRQF_ONESHOT,
> + client->dev.driver->name, kpad);
> if (error) {
> - dev_err(&client->dev, "irq %d busy?\n", client->irq);
> - goto err_unreg_dev;
> + dev_err(&client->dev, "failed to request irq %d: %d\n",
> + client->irq, error);
> + return error;
> }
>
> error = adp5588_setup(client);
> if (error)
> - goto err_free_irq;
> + return error;
>
> if (kpad->gpimapsize)
> adp5588_report_switch_state(kpad);
>
> error = adp5588_gpio_add(kpad);
> if (error)
> - goto err_free_irq;
> + return error;
>
> device_init_wakeup(&client->dev, 1);
> - i2c_set_clientdata(client, kpad);
>
> dev_info(&client->dev, "Rev.%d keypad, irq %d\n", revid, client->irq);
> return 0;
> -
> - err_free_irq:
> - free_irq(client->irq, kpad);
> - err_unreg_dev:
> - input_unregister_device(input);
> - input = NULL;
> - err_free_mem:
> - input_free_device(input);
> - kfree(kpad);
> -
> - return error;
> }
>
> static int adp5588_remove(struct i2c_client *client) {
> - struct adp5588_kpad *kpad = i2c_get_clientdata(client);
> -
> adp5588_write(client, CFG, 0);
> - free_irq(client->irq, kpad);
> - input_unregister_device(kpad->input);
> - adp5588_gpio_remove(kpad);
> - kfree(kpad);
>
> + /* all resources will be freed by devm */
> return 0;
> }
>
> --
> 2.36.1.124.g0e6072fb45-goog
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