diff options
| -rw-r--r-- | package/kernel/gpio-button-hotplug/src/gpio-button-hotplug.c | 270 |
1 files changed, 176 insertions, 94 deletions
diff --git a/package/kernel/gpio-button-hotplug/src/gpio-button-hotplug.c b/package/kernel/gpio-button-hotplug/src/gpio-button-hotplug.c index 19621d9..1a8b476 100644 --- a/package/kernel/gpio-button-hotplug/src/gpio-button-hotplug.c +++ b/package/kernel/gpio-button-hotplug/src/gpio-button-hotplug.c @@ -23,11 +23,12 @@ #include <linux/netlink.h> #include <linux/kobject.h> #include <linux/input.h> +#include <linux/interrupt.h> #include <linux/platform_device.h> #include <linux/of_gpio.h> #include <linux/gpio_keys.h> -#define DRV_NAME "gpio-keys-polled" +#define DRV_NAME "gpio-keys" #define BH_SKB_SIZE 2048 @@ -69,6 +70,7 @@ struct gpio_keys_button_data { int count; int threshold; int can_sleep; + struct gpio_keys_button *b; }; extern u64 uevent_next_seqnum(void); @@ -129,7 +131,6 @@ static int bh_event_add_var(struct bh_event *event, int argv, static int button_hotplug_fill_event(struct bh_event *event) { - char *s; int ret; ret = bh_event_add_var(event, 0, "HOME=%s", "/"); @@ -235,18 +236,18 @@ static int button_get_index(unsigned int code) } static void button_hotplug_event(struct gpio_keys_button_data *data, - unsigned int type, unsigned int code, int value) + unsigned int type, int value) { struct bh_priv *priv = &data->bh; unsigned long seen = jiffies; int btn; - BH_DBG("event type=%u, code=%u, value=%d\n", type, code, value); + BH_DBG("event type=%u, code=%u, value=%d\n", type, data->b->code, value); if ((type != EV_KEY) && (type != EV_SW)) return; - btn = button_get_index(code); + btn = button_get_index(data->b->code); if (btn < 0) return; @@ -256,12 +257,13 @@ static void button_hotplug_event(struct gpio_keys_button_data *data, } #else static void button_hotplug_event(struct gpio_keys_button_data *data, - unsigned int type, unsigned int code, int value) + unsigned int type, int value) { } #endif /* CONFIG_HOTPLUG */ -struct gpio_keys_polled_dev { +struct gpio_keys_button_dev { + int polled; struct delayed_work work; struct device *dev; @@ -269,26 +271,24 @@ struct gpio_keys_polled_dev { struct gpio_keys_button_data data[0]; }; -static int gpio_button_get_value(struct gpio_keys_button *button, - struct gpio_keys_button_data *bdata) +static int gpio_button_get_value(struct gpio_keys_button_data *bdata) { int val; if (bdata->can_sleep) - val = !!gpio_get_value_cansleep(button->gpio); + val = !!gpio_get_value_cansleep(bdata->b->gpio); else - val = !!gpio_get_value(button->gpio); + val = !!gpio_get_value(bdata->b->gpio); - return val ^ button->active_low; + return val ^ bdata->b->active_low; } -static void gpio_keys_polled_check_state(struct gpio_keys_button *button, - struct gpio_keys_button_data *bdata) +static void gpio_keys_polled_check_state(struct gpio_keys_button_data *bdata) { - int state = gpio_button_get_value(button, bdata); + int state = gpio_button_get_value(bdata); if (state != bdata->last_state) { - unsigned int type = button->type ?: EV_KEY; + unsigned int type = bdata->b->type ?: EV_KEY; if (bdata->count < bdata->threshold) { bdata->count++; @@ -296,7 +296,7 @@ static void gpio_keys_polled_check_state(struct gpio_keys_button *button, } if ((bdata->last_state != -1) || (type == EV_SW)) - button_hotplug_event(bdata, type, button->code, state); + button_hotplug_event(bdata, type, state); bdata->last_state = state; } @@ -304,55 +304,58 @@ static void gpio_keys_polled_check_state(struct gpio_keys_button *button, bdata->count = 0; } -static void gpio_keys_polled_queue_work(struct gpio_keys_polled_dev *bdev) +static void gpio_keys_polled_queue_work(struct gpio_keys_button_dev *bdev) { struct gpio_keys_platform_data *pdata = bdev->pdata; unsigned long delay = msecs_to_jiffies(pdata->poll_interval); if (delay >= HZ) - delay = round_jiffies_relative(delay); + delay = round_jiffies_relative(delay); schedule_delayed_work(&bdev->work, delay); } static void gpio_keys_polled_poll(struct work_struct *work) { - struct gpio_keys_polled_dev *bdev = - container_of(work, struct gpio_keys_polled_dev, work.work); - struct gpio_keys_platform_data *pdata = bdev->pdata; + struct gpio_keys_button_dev *bdev = + container_of(work, struct gpio_keys_button_dev, work.work); int i; for (i = 0; i < bdev->pdata->nbuttons; i++) { struct gpio_keys_button_data *bdata = &bdev->data[i]; - gpio_keys_polled_check_state(&pdata->buttons[i], bdata); + gpio_keys_polled_check_state(bdata); } gpio_keys_polled_queue_work(bdev); } -static void gpio_keys_polled_open(struct gpio_keys_polled_dev *bdev) +static void gpio_keys_polled_close(struct gpio_keys_button_dev *bdev) { struct gpio_keys_platform_data *pdata = bdev->pdata; - int i; - if (pdata->enable) - pdata->enable(bdev->dev); + cancel_delayed_work_sync(&bdev->work); - /* report initial state of the buttons */ - for (i = 0; i < pdata->nbuttons; i++) - gpio_keys_polled_check_state(&pdata->buttons[i], &bdev->data[i]); + if (pdata->disable) + pdata->disable(bdev->dev); +} - gpio_keys_polled_queue_work(bdev); +static irqreturn_t button_handle_irq(int irq, void *_bdata) +{ + struct gpio_keys_button_data *bdata = (struct gpio_keys_button_data *) _bdata; + + button_hotplug_event(bdata, bdata->b->type ?: EV_KEY, gpio_button_get_value(bdata)); + + return IRQ_HANDLED; } #ifdef CONFIG_OF static struct gpio_keys_platform_data * -gpio_keys_polled_get_devtree_pdata(struct device *dev) +gpio_keys_get_devtree_pdata(struct device *dev) { struct device_node *node, *pp; struct gpio_keys_platform_data *pdata; struct gpio_keys_button *button; int error; int nbuttons; - int i; + int i = 0; node = dev->of_node; if (!node) @@ -362,7 +365,7 @@ gpio_keys_polled_get_devtree_pdata(struct device *dev) if (nbuttons == 0) return NULL; - pdata = kzalloc(sizeof(*pdata) + nbuttons * (sizeof *button), + pdata = devm_kzalloc(dev, sizeof(*pdata) + nbuttons * (sizeof *button), GFP_KERNEL); if (!pdata) { error = -ENOMEM; @@ -375,7 +378,6 @@ gpio_keys_polled_get_devtree_pdata(struct device *dev) pdata->rep = !!of_get_property(node, "autorepeat", NULL); of_property_read_u32(node, "poll-interval", &pdata->poll_interval); - i = 0; for_each_child_of_node(node, pp) { enum of_gpio_flags flags; @@ -394,7 +396,7 @@ gpio_keys_polled_get_devtree_pdata(struct device *dev) dev_err(dev, "Button without keycode: 0x%x\n", button->gpio); error = -EINVAL; - goto err_free_pdata; + goto err_out; } button->desc = of_get_property(pp, "label", NULL); @@ -411,17 +413,21 @@ gpio_keys_polled_get_devtree_pdata(struct device *dev) if (pdata->nbuttons == 0) { error = -EINVAL; - goto err_free_pdata; + goto err_out; } return pdata; -err_free_pdata: - kfree(pdata); err_out: return ERR_PTR(error); } +static struct of_device_id gpio_keys_of_match[] = { + { .compatible = "gpio-keys", }, + { }, +}; +MODULE_DEVICE_TABLE(of, gpio_keys_of_match); + static struct of_device_id gpio_keys_polled_of_match[] = { { .compatible = "gpio-keys-polled", }, { }, @@ -431,47 +437,47 @@ MODULE_DEVICE_TABLE(of, gpio_keys_polled_of_match); #else static inline struct gpio_keys_platform_data * -gpio_keys_polled_get_devtree_pdata(struct device *dev) +gpio_keys_get_devtree_pdata(struct device *dev) { return NULL; } #endif -static void gpio_keys_polled_close(struct gpio_keys_polled_dev *bdev) -{ - struct gpio_keys_platform_data *pdata = bdev->pdata; - - cancel_delayed_work_sync(&bdev->work); - - if (pdata->disable) - pdata->disable(bdev->dev); -} - -static int gpio_keys_polled_probe(struct platform_device *pdev) +static int gpio_keys_button_probe(struct platform_device *pdev, + struct gpio_keys_button_dev **_bdev, int polled) { struct gpio_keys_platform_data *pdata = pdev->dev.platform_data; struct device *dev = &pdev->dev; - struct gpio_keys_polled_dev *bdev; + struct gpio_keys_button_dev *bdev; + struct gpio_keys_button *buttons; int error; int i; if (!pdata) { - pdata = gpio_keys_polled_get_devtree_pdata(dev); + pdata = gpio_keys_get_devtree_pdata(dev); if (IS_ERR(pdata)) return PTR_ERR(pdata); if (!pdata) { dev_err(dev, "missing platform data\n"); return -EINVAL; } + pdev->dev.platform_data = pdata; } - if (!pdata->poll_interval) { + if (polled && !pdata->poll_interval) { dev_err(dev, "missing poll_interval value\n"); - error = -EINVAL; - goto err_free_pdata; + return -EINVAL; } - bdev = kzalloc(sizeof(struct gpio_keys_polled_dev) + + buttons = devm_kzalloc(dev, pdata->nbuttons * sizeof(struct gpio_keys_button), + GFP_KERNEL); + if (!buttons) { + dev_err(dev, "no memory for button data\n"); + return -ENOMEM; + } + memcpy(buttons, pdata->buttons, pdata->nbuttons * sizeof(struct gpio_keys_button)); + + bdev = devm_kzalloc(dev, sizeof(struct gpio_keys_button_dev) + pdata->nbuttons * sizeof(struct gpio_keys_button_data), GFP_KERNEL); if (!bdev) { @@ -479,23 +485,24 @@ static int gpio_keys_polled_probe(struct platform_device *pdev) return -ENOMEM; } + bdev->polled = polled; + for (i = 0; i < pdata->nbuttons; i++) { - struct gpio_keys_button *button = &pdata->buttons[i]; + struct gpio_keys_button *button = &buttons[i]; struct gpio_keys_button_data *bdata = &bdev->data[i]; unsigned int gpio = button->gpio; if (button->wakeup) { - dev_err(dev, DRV_NAME " does not support wakeup\n"); - error = -EINVAL; - goto err_free_gpio; + dev_err(dev, DRV_NAME "does not support wakeup\n"); + return -EINVAL; } - error = gpio_request(gpio, + error = devm_gpio_request(dev, gpio, button->desc ? button->desc : DRV_NAME); if (error) { dev_err(dev, "unable to claim gpio %u, err=%d\n", gpio, error); - goto err_free_gpio; + return error; } error = gpio_direction_input(gpio); @@ -503,79 +510,154 @@ static int gpio_keys_polled_probe(struct platform_device *pdev) dev_err(dev, "unable to set direction on gpio %u, err=%d\n", gpio, error); - goto err_free_gpio; + return error; } bdata->can_sleep = gpio_cansleep(gpio); bdata->last_state = -1; - bdata->threshold = DIV_ROUND_UP(button->debounce_interval, + + if (bdev->polled) + bdata->threshold = DIV_ROUND_UP(button->debounce_interval, pdata->poll_interval); + else + bdata->threshold = 1; + + bdata->b = &pdata->buttons[i]; } bdev->dev = &pdev->dev; bdev->pdata = pdata; platform_set_drvdata(pdev, bdev); - INIT_DELAYED_WORK(&bdev->work, gpio_keys_polled_poll); - - gpio_keys_polled_open(bdev); + *_bdev = bdev; return 0; +} + +static int gpio_keys_probe(struct platform_device *pdev) +{ + struct gpio_keys_platform_data *pdata; + struct gpio_keys_button_dev *bdev; + int ret, i; -err_free_gpio: - while (--i >= 0) - gpio_free(pdata->buttons[i].gpio); - kfree(bdev); - platform_set_drvdata(pdev, NULL); + ret = gpio_keys_button_probe(pdev, &bdev, 0); -err_free_pdata: - /* If we have no platform_data, we allocated pdata dynamically. */ - if (!dev_get_platdata(&pdev->dev)) - kfree(pdata); + if (ret) + return ret; - return error; + pdata = pdev->dev.platform_data; + for (i = 0; i < pdata->nbuttons; i++) { + struct gpio_keys_button *button = &pdata->buttons[i]; + struct gpio_keys_button_data *bdata = &bdev->data[i]; + + if (bdata->can_sleep) { + dev_err(&pdev->dev, "skipping gpio:%d, it can sleep\n", button->gpio); + continue; + } + if (!button->irq) + button->irq = gpio_to_irq(button->gpio); + if (button->irq < 0) { + dev_err(&pdev->dev, "failed to get irq for gpio:%d\n", button->gpio); + continue; + } + ret = devm_request_irq(&pdev->dev, button->irq, button_handle_irq, + IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, + dev_name(&pdev->dev), bdata); + if (ret) + dev_err(&pdev->dev, "failed to request irq:%d for gpio:%d\n", button->irq, button->gpio); + else + dev_dbg(&pdev->dev, "gpio:%d has irq:%d\n", button->gpio, button->irq); + + if (bdata->b->type == EV_SW) + button_hotplug_event(bdata, EV_SW, gpio_button_get_value(bdata)); + } + + return 0; } -static int gpio_keys_polled_remove(struct platform_device *pdev) +static int gpio_keys_polled_probe(struct platform_device *pdev) { - struct gpio_keys_polled_dev *bdev = platform_get_drvdata(pdev); - struct gpio_keys_platform_data *pdata = bdev->pdata; - int i = pdata->nbuttons; + struct gpio_keys_platform_data *pdata; + struct gpio_keys_button_dev *bdev; + int ret; + int i; + + ret = gpio_keys_button_probe(pdev, &bdev, 1); + + if (ret) + return ret; + + INIT_DELAYED_WORK(&bdev->work, gpio_keys_polled_poll); - gpio_keys_polled_close(bdev); + pdata = bdev->pdata; - while (--i >= 0) - gpio_free(pdata->buttons[i].gpio); + if (pdata->enable) + pdata->enable(bdev->dev); + + for (i = 0; i < pdata->nbuttons; i++) + gpio_keys_polled_check_state(&bdev->data[i]); + + gpio_keys_polled_queue_work(bdev); + + return ret; +} + +static int gpio_keys_remove(struct platform_device *pdev) +{ + struct gpio_keys_button_dev *bdev = platform_get_drvdata(pdev); - kfree(bdev); platform_set_drvdata(pdev, NULL); - return 0; + if (bdev->polled) + gpio_keys_polled_close(bdev); + + return gpio_keys_remove(pdev); } +static struct platform_driver gpio_keys_driver = { + .probe = gpio_keys_probe, + .remove = gpio_keys_remove, + .driver = { + .name = "gpio-keys", + .owner = THIS_MODULE, + .of_match_table = of_match_ptr(gpio_keys_of_match), + }, +}; + static struct platform_driver gpio_keys_polled_driver = { .probe = gpio_keys_polled_probe, - .remove = gpio_keys_polled_remove, + .remove = gpio_keys_remove, .driver = { - .name = DRV_NAME, + .name = "gpio-keys-polled", .owner = THIS_MODULE, .of_match_table = of_match_ptr(gpio_keys_polled_of_match), }, }; -static int __init gpio_keys_polled_init(void) +static int __init gpio_button_init(void) { - return platform_driver_register(&gpio_keys_polled_driver); + int ret; + + ret = platform_driver_register(&gpio_keys_driver); + if (ret) + return ret; + + ret = platform_driver_register(&gpio_keys_polled_driver); + if (ret) + platform_driver_unregister(&gpio_keys_driver); + + return ret; } -static void __exit gpio_keys_polled_exit(void) +static void __exit gpio_button_exit(void) { + platform_driver_unregister(&gpio_keys_driver); platform_driver_unregister(&gpio_keys_polled_driver); } -module_init(gpio_keys_polled_init); -module_exit(gpio_keys_polled_exit); +module_init(gpio_button_init); +module_exit(gpio_button_exit); MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>"); MODULE_AUTHOR("Felix Fietkau <nbd@openwrt.org>"); |