From 0f78ba96bbcf30a78224fe56f8fd72f87915afdd Mon Sep 17 00:00:00 2001 From: Dmitry Torokhov Date: Tue, 23 Feb 2016 15:32:14 -0800 Subject: [PATCH] Input: gpio_keys_polled - keep button data constant Commit 633a21d80b4a ("input: gpio_keys_polled: Add support for GPIO descriptors") placed gpio descriptor into gpio_keys_button structure, which is supposed to be part of platform data and not modifiable by the driver. To keep the data constant, let's move the descriptor to gpio_keys_button_data structure instead. Tested-by: Mika Westerberg Signed-off-by: Dmitry Torokhov --- drivers/input/keyboard/gpio_keys.c | 10 +-- drivers/input/keyboard/gpio_keys_polled.c | 105 ++++++++++++---------- include/linux/gpio_keys.h | 5 +- 3 files changed, 64 insertions(+), 56 deletions(-) diff --git a/drivers/input/keyboard/gpio_keys.c b/drivers/input/keyboard/gpio_keys.c index 29093657f2ef..890eb397d987 100644 --- a/drivers/input/keyboard/gpio_keys.c +++ b/drivers/input/keyboard/gpio_keys.c @@ -624,7 +624,6 @@ gpio_keys_get_devtree_pdata(struct device *dev) struct gpio_keys_button *button; int error; int nbuttons; - int i; node = dev->of_node; if (!node) @@ -640,19 +639,18 @@ gpio_keys_get_devtree_pdata(struct device *dev) if (!pdata) return ERR_PTR(-ENOMEM); - pdata->buttons = (struct gpio_keys_button *)(pdata + 1); + button = (struct gpio_keys_button *)(pdata + 1); + + pdata->buttons = button; pdata->nbuttons = nbuttons; pdata->rep = !!of_get_property(node, "autorepeat", NULL); of_property_read_string(node, "label", &pdata->name); - i = 0; for_each_available_child_of_node(node, pp) { enum of_gpio_flags flags; - button = &pdata->buttons[i++]; - button->gpio = of_get_gpio_flags(pp, 0, &flags); if (button->gpio < 0) { error = button->gpio; @@ -694,6 +692,8 @@ gpio_keys_get_devtree_pdata(struct device *dev) if (of_property_read_u32(pp, "debounce-interval", &button->debounce_interval)) button->debounce_interval = 5; + + button++; } if (pdata->nbuttons == 0) diff --git a/drivers/input/keyboard/gpio_keys_polled.c b/drivers/input/keyboard/gpio_keys_polled.c index 62bdb1d48c49..2cf407831f06 100644 --- a/drivers/input/keyboard/gpio_keys_polled.c +++ b/drivers/input/keyboard/gpio_keys_polled.c @@ -30,6 +30,7 @@ #define DRV_NAME "gpio-keys-polled" struct gpio_keys_button_data { + struct gpio_desc *gpiod; int last_state; int count; int threshold; @@ -46,7 +47,7 @@ struct gpio_keys_polled_dev { }; static void gpio_keys_button_event(struct input_polled_dev *dev, - struct gpio_keys_button *button, + const struct gpio_keys_button *button, int state) { struct gpio_keys_polled_dev *bdev = dev->private; @@ -70,15 +71,15 @@ static void gpio_keys_button_event(struct input_polled_dev *dev, } static void gpio_keys_polled_check_state(struct input_polled_dev *dev, - struct gpio_keys_button *button, + const struct gpio_keys_button *button, struct gpio_keys_button_data *bdata) { int state; if (bdata->can_sleep) - state = !!gpiod_get_value_cansleep(button->gpiod); + state = !!gpiod_get_value_cansleep(bdata->gpiod); else - state = !!gpiod_get_value(button->gpiod); + state = !!gpiod_get_value(bdata->gpiod); gpio_keys_button_event(dev, button, state); @@ -142,48 +143,35 @@ static void gpio_keys_polled_close(struct input_polled_dev *dev) pdata->disable(bdev->dev); } -static struct gpio_keys_platform_data *gpio_keys_polled_get_devtree_pdata(struct device *dev) +static struct gpio_keys_platform_data * +gpio_keys_polled_get_devtree_pdata(struct device *dev) { struct gpio_keys_platform_data *pdata; struct gpio_keys_button *button; struct fwnode_handle *child; - int error; int nbuttons; nbuttons = device_get_child_node_count(dev); if (nbuttons == 0) - return NULL; + return ERR_PTR(-EINVAL); pdata = devm_kzalloc(dev, sizeof(*pdata) + nbuttons * sizeof(*button), GFP_KERNEL); if (!pdata) return ERR_PTR(-ENOMEM); - pdata->buttons = (struct gpio_keys_button *)(pdata + 1); + button = (struct gpio_keys_button *)(pdata + 1); + + pdata->buttons = button; + pdata->nbuttons = nbuttons; pdata->rep = device_property_present(dev, "autorepeat"); device_property_read_u32(dev, "poll-interval", &pdata->poll_interval); device_for_each_child_node(dev, child) { - struct gpio_desc *desc; - - desc = devm_get_gpiod_from_child(dev, NULL, child); - if (IS_ERR(desc)) { - error = PTR_ERR(desc); - if (error != -EPROBE_DEFER) - dev_err(dev, - "Failed to get gpio flags, error: %d\n", - error); - fwnode_handle_put(child); - return ERR_PTR(error); - } - - button = &pdata->buttons[pdata->nbuttons++]; - button->gpiod = desc; - - if (fwnode_property_read_u32(child, "linux,code", &button->code)) { - dev_err(dev, "Button without keycode: %d\n", - pdata->nbuttons - 1); + if (fwnode_property_read_u32(child, "linux,code", + &button->code)) { + dev_err(dev, "button without keycode\n"); fwnode_handle_put(child); return ERR_PTR(-EINVAL); } @@ -206,10 +194,9 @@ static struct gpio_keys_platform_data *gpio_keys_polled_get_devtree_pdata(struct if (fwnode_property_read_u32(child, "debounce-interval", &button->debounce_interval)) button->debounce_interval = 5; - } - if (pdata->nbuttons == 0) - return ERR_PTR(-EINVAL); + button++; + } return pdata; } @@ -220,7 +207,7 @@ static void gpio_keys_polled_set_abs_params(struct input_dev *input, int i, min = 0, max = 0; for (i = 0; i < pdata->nbuttons; i++) { - struct gpio_keys_button *button = &pdata->buttons[i]; + const struct gpio_keys_button *button = &pdata->buttons[i]; if (button->type != EV_ABS || button->code != code) continue; @@ -230,6 +217,7 @@ static void gpio_keys_polled_set_abs_params(struct input_dev *input, if (button->value > max) max = button->value; } + input_set_abs_params(input, code, min, max, 0, 0); } @@ -242,6 +230,7 @@ MODULE_DEVICE_TABLE(of, gpio_keys_polled_of_match); static int gpio_keys_polled_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; + struct fwnode_handle *child = NULL; const struct gpio_keys_platform_data *pdata = dev_get_platdata(dev); struct gpio_keys_polled_dev *bdev; struct input_polled_dev *poll_dev; @@ -254,10 +243,6 @@ static int gpio_keys_polled_probe(struct platform_device *pdev) pdata = gpio_keys_polled_get_devtree_pdata(dev); if (IS_ERR(pdata)) return PTR_ERR(pdata); - if (!pdata) { - dev_err(dev, "missing platform data\n"); - return -EINVAL; - } } if (!pdata->poll_interval) { @@ -300,20 +285,40 @@ static int gpio_keys_polled_probe(struct platform_device *pdev) __set_bit(EV_REP, input->evbit); for (i = 0; i < pdata->nbuttons; i++) { - struct gpio_keys_button *button = &pdata->buttons[i]; + const struct gpio_keys_button *button = &pdata->buttons[i]; struct gpio_keys_button_data *bdata = &bdev->data[i]; unsigned int type = button->type ?: EV_KEY; if (button->wakeup) { dev_err(dev, DRV_NAME " does not support wakeup\n"); + fwnode_handle_put(child); return -EINVAL; } - /* - * Legacy GPIO number so request the GPIO here and - * convert it to descriptor. - */ - if (!button->gpiod && gpio_is_valid(button->gpio)) { + if (!dev_get_platdata(dev)) { + /* No legacy static platform data */ + child = device_get_next_child_node(dev, child); + if (!child) { + dev_err(dev, "missing child device node\n"); + return -EINVAL; + } + + bdata->gpiod = devm_get_gpiod_from_child(dev, NULL, + child); + if (IS_ERR(bdata->gpiod)) { + error = PTR_ERR(bdata->gpiod); + if (error != -EPROBE_DEFER) + dev_err(dev, + "failed to get gpio: %d\n", + error); + fwnode_handle_put(child); + return error; + } + } else if (gpio_is_valid(button->gpio)) { + /* + * Legacy GPIO number so request the GPIO here and + * convert it to descriptor. + */ unsigned flags = GPIOF_IN; if (button->active_low) @@ -322,18 +327,22 @@ static int gpio_keys_polled_probe(struct platform_device *pdev) error = devm_gpio_request_one(&pdev->dev, button->gpio, flags, button->desc ? : DRV_NAME); if (error) { - dev_err(dev, "unable to claim gpio %u, err=%d\n", + dev_err(dev, + "unable to claim gpio %u, err=%d\n", button->gpio, error); return error; } - button->gpiod = gpio_to_desc(button->gpio); + bdata->gpiod = gpio_to_desc(button->gpio); + if (!bdata->gpiod) { + dev_err(dev, + "unable to convert gpio %u to descriptor\n", + button->gpio); + return -EINVAL; + } } - if (IS_ERR(button->gpiod)) - return PTR_ERR(button->gpiod); - - bdata->can_sleep = gpiod_cansleep(button->gpiod); + bdata->can_sleep = gpiod_cansleep(bdata->gpiod); bdata->last_state = -1; bdata->threshold = DIV_ROUND_UP(button->debounce_interval, pdata->poll_interval); @@ -344,6 +353,8 @@ static int gpio_keys_polled_probe(struct platform_device *pdev) button->code); } + fwnode_handle_put(child); + bdev->poll_dev = poll_dev; bdev->dev = dev; bdev->pdata = pdata; diff --git a/include/linux/gpio_keys.h b/include/linux/gpio_keys.h index ee2d8c6f9130..0b71024c082c 100644 --- a/include/linux/gpio_keys.h +++ b/include/linux/gpio_keys.h @@ -2,7 +2,6 @@ #define _GPIO_KEYS_H struct device; -struct gpio_desc; /** * struct gpio_keys_button - configuration parameters @@ -18,7 +17,6 @@ struct gpio_desc; * disable button via sysfs * @value: axis value for %EV_ABS * @irq: Irq number in case of interrupt keys - * @gpiod: GPIO descriptor */ struct gpio_keys_button { unsigned int code; @@ -31,7 +29,6 @@ struct gpio_keys_button { bool can_disable; int value; unsigned int irq; - struct gpio_desc *gpiod; }; /** @@ -46,7 +43,7 @@ struct gpio_keys_button { * @name: input device name */ struct gpio_keys_platform_data { - struct gpio_keys_button *buttons; + const struct gpio_keys_button *buttons; int nbuttons; unsigned int poll_interval; unsigned int rep:1; -- 2.39.5