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HID: cp2112: add IRQ chip handling
The GPIO part doesn't provide interrupts when GPIO are toggled. So use a polling mechanism if someone requests a GPIO as an IRQ. Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Benjamin Tissoires
Jiri Kosina
parent
e2b6535d47
commit
13de9cca51
@ -24,6 +24,7 @@
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* http://www.silabs.com/Support%20Documents/TechnicalDocs/AN495.pdf
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*/
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#include <linux/gpio.h>
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#include <linux/gpio/driver.h>
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#include <linux/hid.h>
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#include <linux/i2c.h>
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@ -168,6 +169,12 @@ struct cp2112_device {
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struct gpio_chip gc;
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u8 *in_out_buffer;
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spinlock_t lock;
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struct gpio_desc *desc[8];
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bool gpio_poll;
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struct delayed_work gpio_poll_worker;
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unsigned long irq_mask;
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u8 gpio_prev_state;
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};
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static int gpio_push_pull = 0xFF;
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@ -233,7 +240,7 @@ static void cp2112_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
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spin_unlock_irqrestore(&dev->lock, flags);
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}
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static int cp2112_gpio_get(struct gpio_chip *chip, unsigned offset)
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static int cp2112_gpio_get_all(struct gpio_chip *chip)
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{
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struct cp2112_device *dev = gpiochip_get_data(chip);
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struct hid_device *hdev = dev->hdev;
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@ -252,7 +259,7 @@ static int cp2112_gpio_get(struct gpio_chip *chip, unsigned offset)
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goto exit;
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}
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ret = (buf[1] >> offset) & 1;
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ret = buf[1];
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exit:
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spin_unlock_irqrestore(&dev->lock, flags);
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@ -260,6 +267,17 @@ exit:
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return ret;
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}
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static int cp2112_gpio_get(struct gpio_chip *chip, unsigned int offset)
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{
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int ret;
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ret = cp2112_gpio_get_all(chip);
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if (ret < 0)
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return ret;
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return (ret >> offset) & 1;
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}
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static int cp2112_gpio_direction_output(struct gpio_chip *chip,
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unsigned offset, int value)
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{
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@ -1041,6 +1059,166 @@ static void chmod_sysfs_attrs(struct hid_device *hdev)
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}
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}
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static void cp2112_gpio_irq_ack(struct irq_data *d)
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{
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}
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static void cp2112_gpio_irq_mask(struct irq_data *d)
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{
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struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
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struct cp2112_device *dev = gpiochip_get_data(gc);
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__clear_bit(d->hwirq, &dev->irq_mask);
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}
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static void cp2112_gpio_irq_unmask(struct irq_data *d)
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{
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struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
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struct cp2112_device *dev = gpiochip_get_data(gc);
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__set_bit(d->hwirq, &dev->irq_mask);
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}
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static void cp2112_gpio_poll_callback(struct work_struct *work)
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{
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struct cp2112_device *dev = container_of(work, struct cp2112_device,
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gpio_poll_worker.work);
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struct irq_data *d;
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u8 gpio_mask;
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u8 virqs = (u8)dev->irq_mask;
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u32 irq_type;
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int irq, virq, ret;
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ret = cp2112_gpio_get_all(&dev->gc);
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if (ret == -ENODEV) /* the hardware has been disconnected */
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return;
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if (ret < 0)
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goto exit;
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gpio_mask = ret;
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while (virqs) {
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virq = ffs(virqs) - 1;
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virqs &= ~BIT(virq);
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if (!dev->gc.to_irq)
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break;
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irq = dev->gc.to_irq(&dev->gc, virq);
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d = irq_get_irq_data(irq);
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if (!d)
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continue;
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irq_type = irqd_get_trigger_type(d);
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if (gpio_mask & BIT(virq)) {
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/* Level High */
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if (irq_type & IRQ_TYPE_LEVEL_HIGH)
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handle_nested_irq(irq);
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if ((irq_type & IRQ_TYPE_EDGE_RISING) &&
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!(dev->gpio_prev_state & BIT(virq)))
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handle_nested_irq(irq);
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} else {
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/* Level Low */
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if (irq_type & IRQ_TYPE_LEVEL_LOW)
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handle_nested_irq(irq);
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if ((irq_type & IRQ_TYPE_EDGE_FALLING) &&
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(dev->gpio_prev_state & BIT(virq)))
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handle_nested_irq(irq);
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}
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}
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dev->gpio_prev_state = gpio_mask;
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exit:
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if (dev->gpio_poll)
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schedule_delayed_work(&dev->gpio_poll_worker, 10);
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}
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static unsigned int cp2112_gpio_irq_startup(struct irq_data *d)
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{
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struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
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struct cp2112_device *dev = gpiochip_get_data(gc);
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INIT_DELAYED_WORK(&dev->gpio_poll_worker, cp2112_gpio_poll_callback);
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cp2112_gpio_direction_input(gc, d->hwirq);
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if (!dev->gpio_poll) {
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dev->gpio_poll = true;
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schedule_delayed_work(&dev->gpio_poll_worker, 0);
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}
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cp2112_gpio_irq_unmask(d);
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return 0;
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}
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static void cp2112_gpio_irq_shutdown(struct irq_data *d)
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{
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struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
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struct cp2112_device *dev = gpiochip_get_data(gc);
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cancel_delayed_work_sync(&dev->gpio_poll_worker);
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}
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static int cp2112_gpio_irq_type(struct irq_data *d, unsigned int type)
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{
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return 0;
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}
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static struct irq_chip cp2112_gpio_irqchip = {
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.name = "cp2112-gpio",
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.irq_startup = cp2112_gpio_irq_startup,
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.irq_shutdown = cp2112_gpio_irq_shutdown,
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.irq_ack = cp2112_gpio_irq_ack,
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.irq_mask = cp2112_gpio_irq_mask,
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.irq_unmask = cp2112_gpio_irq_unmask,
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.irq_set_type = cp2112_gpio_irq_type,
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};
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static int __maybe_unused cp2112_allocate_irq(struct cp2112_device *dev,
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int pin)
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{
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int ret;
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if (dev->desc[pin])
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return -EINVAL;
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dev->desc[pin] = gpiochip_request_own_desc(&dev->gc, pin,
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"HID/I2C:Event");
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if (IS_ERR(dev->desc[pin])) {
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dev_err(dev->gc.parent, "Failed to request GPIO\n");
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return PTR_ERR(dev->desc[pin]);
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}
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ret = gpiochip_lock_as_irq(&dev->gc, pin);
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if (ret) {
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dev_err(dev->gc.parent, "Failed to lock GPIO as interrupt\n");
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goto err_desc;
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}
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ret = gpiod_to_irq(dev->desc[pin]);
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if (ret < 0) {
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dev_err(dev->gc.parent, "Failed to translate GPIO to IRQ\n");
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goto err_lock;
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}
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return ret;
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err_lock:
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gpiochip_unlock_as_irq(&dev->gc, pin);
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err_desc:
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gpiochip_free_own_desc(dev->desc[pin]);
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dev->desc[pin] = NULL;
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return ret;
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}
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static int cp2112_probe(struct hid_device *hdev, const struct hid_device_id *id)
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{
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struct cp2112_device *dev;
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@ -1163,8 +1341,17 @@ static int cp2112_probe(struct hid_device *hdev, const struct hid_device_id *id)
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chmod_sysfs_attrs(hdev);
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hid_hw_power(hdev, PM_HINT_NORMAL);
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ret = gpiochip_irqchip_add(&dev->gc, &cp2112_gpio_irqchip, 0,
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handle_simple_irq, IRQ_TYPE_NONE);
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if (ret) {
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dev_err(dev->gc.parent, "failed to add IRQ chip\n");
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goto err_sysfs_remove;
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}
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return ret;
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err_sysfs_remove:
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sysfs_remove_group(&hdev->dev.kobj, &cp2112_attr_group);
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err_gpiochip_remove:
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gpiochip_remove(&dev->gc);
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err_free_i2c:
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@ -1181,10 +1368,22 @@ err_hid_stop:
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static void cp2112_remove(struct hid_device *hdev)
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{
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struct cp2112_device *dev = hid_get_drvdata(hdev);
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int i;
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sysfs_remove_group(&hdev->dev.kobj, &cp2112_attr_group);
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gpiochip_remove(&dev->gc);
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i2c_del_adapter(&dev->adap);
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if (dev->gpio_poll) {
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dev->gpio_poll = false;
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cancel_delayed_work_sync(&dev->gpio_poll_worker);
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}
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for (i = 0; i < ARRAY_SIZE(dev->desc); i++) {
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gpiochip_unlock_as_irq(&dev->gc, i);
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gpiochip_free_own_desc(dev->desc[i]);
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}
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gpiochip_remove(&dev->gc);
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/* i2c_del_adapter has finished removing all i2c devices from our
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* adapter. Well behaved devices should no longer call our cp2112_xfer
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* and should have waited for any pending calls to finish. It has also
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