gpio-button-hotplug: add irq mode to driver
Signed-off-by: John Crispin <blogic@openwrt.org> SVN-Revision: 39021
This commit is contained in:
John Crispin
parent
31a2912cd9
commit
bc76dec31f
1 changed files with 178 additions and 96 deletions
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@ -23,11 +23,12 @@
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#include <linux/netlink.h>
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#include <linux/kobject.h>
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#include <linux/input.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <linux/of_gpio.h>
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#include <linux/gpio_keys.h>
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#define DRV_NAME "gpio-keys-polled"
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#define DRV_NAME "gpio-keys"
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#define BH_SKB_SIZE 2048
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@ -69,6 +70,7 @@ struct gpio_keys_button_data {
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int count;
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int threshold;
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int can_sleep;
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struct gpio_keys_button *b;
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};
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extern u64 uevent_next_seqnum(void);
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@ -129,7 +131,6 @@ static int bh_event_add_var(struct bh_event *event, int argv,
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static int button_hotplug_fill_event(struct bh_event *event)
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{
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char *s;
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int ret;
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ret = bh_event_add_var(event, 0, "HOME=%s", "/");
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@ -235,18 +236,18 @@ static int button_get_index(unsigned int code)
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}
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static void button_hotplug_event(struct gpio_keys_button_data *data,
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unsigned int type, unsigned int code, int value)
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unsigned int type, int value)
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{
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struct bh_priv *priv = &data->bh;
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unsigned long seen = jiffies;
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int btn;
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BH_DBG("event type=%u, code=%u, value=%d\n", type, code, value);
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BH_DBG("event type=%u, code=%u, value=%d\n", type, data->b->code, value);
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if ((type != EV_KEY) && (type != EV_SW))
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return;
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btn = button_get_index(code);
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btn = button_get_index(data->b->code);
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if (btn < 0)
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return;
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@ -256,12 +257,13 @@ static void button_hotplug_event(struct gpio_keys_button_data *data,
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}
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#else
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static void button_hotplug_event(struct gpio_keys_button_data *data,
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unsigned int type, unsigned int code, int value)
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unsigned int type, int value)
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{
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}
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#endif /* CONFIG_HOTPLUG */
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struct gpio_keys_polled_dev {
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struct gpio_keys_button_dev {
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int polled;
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struct delayed_work work;
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struct device *dev;
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@ -269,26 +271,24 @@ struct gpio_keys_polled_dev {
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struct gpio_keys_button_data data[0];
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};
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static int gpio_button_get_value(struct gpio_keys_button *button,
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struct gpio_keys_button_data *bdata)
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static int gpio_button_get_value(struct gpio_keys_button_data *bdata)
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{
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int val;
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if (bdata->can_sleep)
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val = !!gpio_get_value_cansleep(button->gpio);
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val = !!gpio_get_value_cansleep(bdata->b->gpio);
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else
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val = !!gpio_get_value(button->gpio);
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val = !!gpio_get_value(bdata->b->gpio);
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return val ^ button->active_low;
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return val ^ bdata->b->active_low;
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}
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static void gpio_keys_polled_check_state(struct gpio_keys_button *button,
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struct gpio_keys_button_data *bdata)
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static void gpio_keys_polled_check_state(struct gpio_keys_button_data *bdata)
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{
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int state = gpio_button_get_value(button, bdata);
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int state = gpio_button_get_value(bdata);
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if (state != bdata->last_state) {
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unsigned int type = button->type ?: EV_KEY;
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unsigned int type = bdata->b->type ?: EV_KEY;
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if (bdata->count < bdata->threshold) {
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bdata->count++;
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@ -296,7 +296,7 @@ static void gpio_keys_polled_check_state(struct gpio_keys_button *button,
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}
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if ((bdata->last_state != -1) || (type == EV_SW))
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button_hotplug_event(bdata, type, button->code, state);
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button_hotplug_event(bdata, type, state);
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bdata->last_state = state;
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}
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@ -304,55 +304,58 @@ static void gpio_keys_polled_check_state(struct gpio_keys_button *button,
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bdata->count = 0;
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}
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static void gpio_keys_polled_queue_work(struct gpio_keys_polled_dev *bdev)
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static void gpio_keys_polled_queue_work(struct gpio_keys_button_dev *bdev)
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{
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struct gpio_keys_platform_data *pdata = bdev->pdata;
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unsigned long delay = msecs_to_jiffies(pdata->poll_interval);
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if (delay >= HZ)
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delay = round_jiffies_relative(delay);
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delay = round_jiffies_relative(delay);
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schedule_delayed_work(&bdev->work, delay);
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}
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static void gpio_keys_polled_poll(struct work_struct *work)
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{
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struct gpio_keys_polled_dev *bdev =
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container_of(work, struct gpio_keys_polled_dev, work.work);
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struct gpio_keys_platform_data *pdata = bdev->pdata;
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struct gpio_keys_button_dev *bdev =
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container_of(work, struct gpio_keys_button_dev, work.work);
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int i;
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for (i = 0; i < bdev->pdata->nbuttons; i++) {
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struct gpio_keys_button_data *bdata = &bdev->data[i];
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gpio_keys_polled_check_state(&pdata->buttons[i], bdata);
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gpio_keys_polled_check_state(bdata);
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}
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gpio_keys_polled_queue_work(bdev);
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}
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static void gpio_keys_polled_open(struct gpio_keys_polled_dev *bdev)
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static void gpio_keys_polled_close(struct gpio_keys_button_dev *bdev)
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{
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struct gpio_keys_platform_data *pdata = bdev->pdata;
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int i;
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if (pdata->enable)
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pdata->enable(bdev->dev);
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cancel_delayed_work_sync(&bdev->work);
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/* report initial state of the buttons */
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for (i = 0; i < pdata->nbuttons; i++)
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gpio_keys_polled_check_state(&pdata->buttons[i], &bdev->data[i]);
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if (pdata->disable)
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pdata->disable(bdev->dev);
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}
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gpio_keys_polled_queue_work(bdev);
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static irqreturn_t button_handle_irq(int irq, void *_bdata)
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{
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struct gpio_keys_button_data *bdata = (struct gpio_keys_button_data *) _bdata;
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button_hotplug_event(bdata, bdata->b->type ?: EV_KEY, gpio_button_get_value(bdata));
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return IRQ_HANDLED;
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}
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#ifdef CONFIG_OF
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static struct gpio_keys_platform_data *
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gpio_keys_polled_get_devtree_pdata(struct device *dev)
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gpio_keys_get_devtree_pdata(struct device *dev)
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{
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struct device_node *node, *pp;
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struct gpio_keys_platform_data *pdata;
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struct gpio_keys_button *button;
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int error;
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int nbuttons;
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int i;
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int i = 0;
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node = dev->of_node;
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if (!node)
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@ -362,7 +365,7 @@ gpio_keys_polled_get_devtree_pdata(struct device *dev)
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if (nbuttons == 0)
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return NULL;
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pdata = kzalloc(sizeof(*pdata) + nbuttons * (sizeof *button),
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pdata = devm_kzalloc(dev, sizeof(*pdata) + nbuttons * (sizeof *button),
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GFP_KERNEL);
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if (!pdata) {
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error = -ENOMEM;
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@ -375,7 +378,6 @@ gpio_keys_polled_get_devtree_pdata(struct device *dev)
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pdata->rep = !!of_get_property(node, "autorepeat", NULL);
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of_property_read_u32(node, "poll-interval", &pdata->poll_interval);
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i = 0;
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for_each_child_of_node(node, pp) {
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enum of_gpio_flags flags;
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@ -394,7 +396,7 @@ gpio_keys_polled_get_devtree_pdata(struct device *dev)
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dev_err(dev, "Button without keycode: 0x%x\n",
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button->gpio);
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error = -EINVAL;
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goto err_free_pdata;
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goto err_out;
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}
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button->desc = of_get_property(pp, "label", NULL);
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@ -411,17 +413,21 @@ gpio_keys_polled_get_devtree_pdata(struct device *dev)
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if (pdata->nbuttons == 0) {
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error = -EINVAL;
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goto err_free_pdata;
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goto err_out;
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}
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return pdata;
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err_free_pdata:
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kfree(pdata);
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err_out:
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return ERR_PTR(error);
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}
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static struct of_device_id gpio_keys_of_match[] = {
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{ .compatible = "gpio-keys", },
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{ },
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};
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MODULE_DEVICE_TABLE(of, gpio_keys_of_match);
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static struct of_device_id gpio_keys_polled_of_match[] = {
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{ .compatible = "gpio-keys-polled", },
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{ },
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@ -431,47 +437,47 @@ MODULE_DEVICE_TABLE(of, gpio_keys_polled_of_match);
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#else
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static inline struct gpio_keys_platform_data *
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gpio_keys_polled_get_devtree_pdata(struct device *dev)
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gpio_keys_get_devtree_pdata(struct device *dev)
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{
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return NULL;
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}
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#endif
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static void gpio_keys_polled_close(struct gpio_keys_polled_dev *bdev)
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{
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struct gpio_keys_platform_data *pdata = bdev->pdata;
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cancel_delayed_work_sync(&bdev->work);
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if (pdata->disable)
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pdata->disable(bdev->dev);
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}
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static int gpio_keys_polled_probe(struct platform_device *pdev)
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static int gpio_keys_button_probe(struct platform_device *pdev,
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struct gpio_keys_button_dev **_bdev, int polled)
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{
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struct gpio_keys_platform_data *pdata = pdev->dev.platform_data;
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struct device *dev = &pdev->dev;
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struct gpio_keys_polled_dev *bdev;
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struct gpio_keys_button_dev *bdev;
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struct gpio_keys_button *buttons;
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int error;
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int i;
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if (!pdata) {
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pdata = gpio_keys_polled_get_devtree_pdata(dev);
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pdata = gpio_keys_get_devtree_pdata(dev);
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if (IS_ERR(pdata))
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return PTR_ERR(pdata);
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if (!pdata) {
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dev_err(dev, "missing platform data\n");
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return -EINVAL;
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}
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pdev->dev.platform_data = pdata;
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}
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if (!pdata->poll_interval) {
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if (polled && !pdata->poll_interval) {
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dev_err(dev, "missing poll_interval value\n");
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error = -EINVAL;
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goto err_free_pdata;
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return -EINVAL;
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}
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bdev = kzalloc(sizeof(struct gpio_keys_polled_dev) +
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buttons = devm_kzalloc(dev, pdata->nbuttons * sizeof(struct gpio_keys_button),
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GFP_KERNEL);
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if (!buttons) {
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dev_err(dev, "no memory for button data\n");
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return -ENOMEM;
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}
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memcpy(buttons, pdata->buttons, pdata->nbuttons * sizeof(struct gpio_keys_button));
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bdev = devm_kzalloc(dev, sizeof(struct gpio_keys_button_dev) +
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pdata->nbuttons * sizeof(struct gpio_keys_button_data),
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GFP_KERNEL);
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if (!bdev) {
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@ -479,23 +485,24 @@ static int gpio_keys_polled_probe(struct platform_device *pdev)
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return -ENOMEM;
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}
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bdev->polled = polled;
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for (i = 0; i < pdata->nbuttons; i++) {
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struct gpio_keys_button *button = &pdata->buttons[i];
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struct gpio_keys_button *button = &buttons[i];
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struct gpio_keys_button_data *bdata = &bdev->data[i];
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unsigned int gpio = button->gpio;
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if (button->wakeup) {
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dev_err(dev, DRV_NAME " does not support wakeup\n");
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error = -EINVAL;
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goto err_free_gpio;
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dev_err(dev, DRV_NAME "does not support wakeup\n");
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return -EINVAL;
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}
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error = gpio_request(gpio,
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error = devm_gpio_request(dev, gpio,
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button->desc ? button->desc : DRV_NAME);
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if (error) {
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dev_err(dev, "unable to claim gpio %u, err=%d\n",
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gpio, error);
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goto err_free_gpio;
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return error;
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}
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error = gpio_direction_input(gpio);
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@ -503,79 +510,154 @@ static int gpio_keys_polled_probe(struct platform_device *pdev)
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dev_err(dev,
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"unable to set direction on gpio %u, err=%d\n",
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gpio, error);
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goto err_free_gpio;
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return error;
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}
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bdata->can_sleep = gpio_cansleep(gpio);
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bdata->last_state = -1;
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bdata->threshold = DIV_ROUND_UP(button->debounce_interval,
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if (bdev->polled)
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bdata->threshold = DIV_ROUND_UP(button->debounce_interval,
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pdata->poll_interval);
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else
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bdata->threshold = 1;
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bdata->b = &pdata->buttons[i];
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}
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bdev->dev = &pdev->dev;
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bdev->pdata = pdata;
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platform_set_drvdata(pdev, bdev);
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*_bdev = bdev;
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return 0;
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}
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static int gpio_keys_probe(struct platform_device *pdev)
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{
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struct gpio_keys_platform_data *pdata;
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struct gpio_keys_button_dev *bdev;
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int ret, i;
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ret = gpio_keys_button_probe(pdev, &bdev, 0);
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if (ret)
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return ret;
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pdata = pdev->dev.platform_data;
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for (i = 0; i < pdata->nbuttons; i++) {
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struct gpio_keys_button *button = &pdata->buttons[i];
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struct gpio_keys_button_data *bdata = &bdev->data[i];
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if (bdata->can_sleep) {
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dev_err(&pdev->dev, "skipping gpio:%d, it can sleep\n", button->gpio);
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continue;
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}
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if (!button->irq)
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button->irq = gpio_to_irq(button->gpio);
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if (button->irq < 0) {
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dev_err(&pdev->dev, "failed to get irq for gpio:%d\n", button->gpio);
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continue;
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}
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ret = devm_request_irq(&pdev->dev, button->irq, button_handle_irq,
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IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
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dev_name(&pdev->dev), bdata);
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if (ret)
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dev_err(&pdev->dev, "failed to request irq:%d for gpio:%d\n", button->irq, button->gpio);
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else
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dev_dbg(&pdev->dev, "gpio:%d has irq:%d\n", button->gpio, button->irq);
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if (bdata->b->type == EV_SW)
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button_hotplug_event(bdata, EV_SW, gpio_button_get_value(bdata));
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}
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return 0;
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}
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static int gpio_keys_polled_probe(struct platform_device *pdev)
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{
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struct gpio_keys_platform_data *pdata;
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struct gpio_keys_button_dev *bdev;
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int ret;
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int i;
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ret = gpio_keys_button_probe(pdev, &bdev, 1);
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if (ret)
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return ret;
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INIT_DELAYED_WORK(&bdev->work, gpio_keys_polled_poll);
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gpio_keys_polled_open(bdev);
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pdata = bdev->pdata;
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return 0;
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if (pdata->enable)
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pdata->enable(bdev->dev);
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err_free_gpio:
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while (--i >= 0)
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gpio_free(pdata->buttons[i].gpio);
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for (i = 0; i < pdata->nbuttons; i++)
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gpio_keys_polled_check_state(&bdev->data[i]);
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kfree(bdev);
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platform_set_drvdata(pdev, NULL);
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gpio_keys_polled_queue_work(bdev);
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err_free_pdata:
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/* If we have no platform_data, we allocated pdata dynamically. */
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if (!dev_get_platdata(&pdev->dev))
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kfree(pdata);
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return error;
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return ret;
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}
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static int gpio_keys_polled_remove(struct platform_device *pdev)
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static int gpio_keys_remove(struct platform_device *pdev)
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{
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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_button_dev *bdev = platform_get_drvdata(pdev);
|
||||
|
||||
gpio_keys_polled_close(bdev);
|
||||
|
||||
while (--i >= 0)
|
||||
gpio_free(pdata->buttons[i].gpio);
|
||||
|
||||
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>");
|
||||
|
|
|
|||
Loading…
Reference in a new issue