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Date: Wed, 26 May 2010 22:29:53 +0800
From: Eric Miao <eric.y.miao@...il.com>
To: Luotao Fu <l.fu@...gutronix.de>
Cc: Dmitry Torokhov <dmitry.torokhov@...il.com>,
Marek Vasut <marek.vasut@...il.com>,
linux-kernel@...r.kernel.org, linux-input@...r.kernel.org
Subject: Re: [PATCH] matrix_keypad: add support for clustered irq
On Wed, May 26, 2010 at 9:57 PM, Luotao Fu <l.fu@...gutronix.de> wrote:
> This one adds support of a combined irq source for the whole matrix keypad.
> This can be useful all rows and columns of the keypad is e.g. connected to
> a GPIO expander, which only has one interrupt line for all events on every
> single GPIO.
>
> Signed-off-by: Luotao Fu <l.fu@...gutronix.de>
> ---
> drivers/input/keyboard/matrix_keypad.c | 80 ++++++++++++++++++++++++++------
> include/linux/input/matrix_keypad.h | 5 ++
> 2 files changed, 70 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/input/keyboard/matrix_keypad.c b/drivers/input/keyboard/matrix_keypad.c
> index b443e08..260dcb0 100644
> --- a/drivers/input/keyboard/matrix_keypad.c
> +++ b/drivers/input/keyboard/matrix_keypad.c
> @@ -87,8 +87,12 @@ static void enable_row_irqs(struct matrix_keypad *keypad)
> const struct matrix_keypad_platform_data *pdata = keypad->pdata;
> int i;
>
> - for (i = 0; i < pdata->num_row_gpios; i++)
> - enable_irq(gpio_to_irq(pdata->row_gpios[i]));
> + if (pdata->clustered_irq > 0)
> + enable_irq(pdata->clustered_irq);
> + else {
> + for (i = 0; i < pdata->num_row_gpios; i++)
> + enable_irq(gpio_to_irq(pdata->row_gpios[i]));
> + }
> }
>
> static void disable_row_irqs(struct matrix_keypad *keypad)
> @@ -96,8 +100,12 @@ static void disable_row_irqs(struct matrix_keypad *keypad)
> const struct matrix_keypad_platform_data *pdata = keypad->pdata;
> int i;
>
> - for (i = 0; i < pdata->num_row_gpios; i++)
> - disable_irq_nosync(gpio_to_irq(pdata->row_gpios[i]));
> + if (pdata->clustered_irq > 0)
> + disable_irq_nosync(pdata->clustered_irq);
> + else {
> + for (i = 0; i < pdata->num_row_gpios; i++)
> + disable_irq_nosync(gpio_to_irq(pdata->row_gpios[i]));
> + }
> }
>
> /*
> @@ -226,6 +234,17 @@ static int matrix_keypad_suspend(struct device *dev)
> matrix_keypad_stop(keypad->input_dev);
>
> if (device_may_wakeup(&pdev->dev)) {
> + if (pdata->clustered_irq > 0) {
> + unsigned int cirq = pdata->clustered_irq;
> +
> + if (enable_irq_wake(cirq) == 0) {
> + for (i = 0; i < pdata->num_row_gpios; i++)
> + __set_bit(i, keypad->disabled_gpios);
> + }
> +
> + goto out;
> + }
> +
This might deserve a separate function, and what is the usage of disabled_gpios,
I seem to find nowhere (except in the resume routine).
> for (i = 0; i < pdata->num_row_gpios; i++) {
> if (!test_bit(i, keypad->disabled_gpios)) {
> unsigned int gpio = pdata->row_gpios[i];
> @@ -235,7 +254,7 @@ static int matrix_keypad_suspend(struct device *dev)
> }
> }
> }
> -
> +out:
> return 0;
> }
>
> @@ -247,6 +266,17 @@ static int matrix_keypad_resume(struct device *dev)
> int i;
>
> if (device_may_wakeup(&pdev->dev)) {
> + if (pdata->clustered_irq > 0) {
> + unsigned int cirq = pdata->clustered_irq;
> +
> + if (disable_irq_wake(cirq) == 0) {
> + for (i = 0; i < pdata->num_row_gpios; i++)
> + clear_bit(i, keypad->disabled_gpios);
> + }
> +
> + goto out;
> + }
> +
Better a separate routine.
> for (i = 0; i < pdata->num_row_gpios; i++) {
> if (test_and_clear_bit(i, keypad->disabled_gpios)) {
> unsigned int gpio = pdata->row_gpios[i];
> @@ -256,6 +286,7 @@ static int matrix_keypad_resume(struct device *dev)
> }
> }
>
> +out:
> matrix_keypad_start(keypad->input_dev);
>
> return 0;
> @@ -296,17 +327,31 @@ static int __devinit init_matrix_gpio(struct platform_device *pdev,
> gpio_direction_input(pdata->row_gpios[i]);
> }
>
> - for (i = 0; i < pdata->num_row_gpios; i++) {
> - err = request_irq(gpio_to_irq(pdata->row_gpios[i]),
> + if (pdata->clustered_irq > 0) {
> + err = request_irq(pdata->clustered_irq,
> matrix_keypad_interrupt,
> - IRQF_DISABLED |
> - IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
> + pdata->clustered_irq_flags,
> "matrix-keypad", keypad);
> if (err) {
> dev_err(&pdev->dev,
> - "Unable to acquire interrupt for GPIO line %i\n",
> - pdata->row_gpios[i]);
> - goto err_free_irqs;
> + "Unable to acquire clustered interrupt\n");
> + goto err_free_rows;
> + }
> + } else {
> + for (i = 0; i < pdata->num_row_gpios; i++) {
> + err = request_irq(gpio_to_irq(pdata->row_gpios[i]),
> + matrix_keypad_interrupt,
> + IRQF_DISABLED |
> + IRQF_TRIGGER_RISING |
> + IRQF_TRIGGER_FALLING,
> + "matrix-keypad", keypad);
> + if (err) {
> + dev_err(&pdev->dev,
> + "Unable to acquire interrupt "
> + "for GPIO line %i\n",
> + pdata->row_gpios[i]);
> + goto err_free_irqs;
> + }
Ditto.
> }
> }
>
> @@ -418,11 +463,16 @@ static int __devexit matrix_keypad_remove(struct platform_device *pdev)
>
> device_init_wakeup(&pdev->dev, 0);
>
> - for (i = 0; i < pdata->num_row_gpios; i++) {
> - free_irq(gpio_to_irq(pdata->row_gpios[i]), keypad);
> - gpio_free(pdata->row_gpios[i]);
> + if (pdata->clustered_irq > 0) {
> + free_irq(pdata->clustered_irq, keypad);
> + } else {
> + for (i = 0; i < pdata->num_row_gpios; i++)
> + free_irq(gpio_to_irq(pdata->row_gpios[i]), keypad);
> }
>
> + for (i = 0; i < pdata->num_row_gpios; i++)
> + gpio_free(pdata->row_gpios[i]);
> +
> for (i = 0; i < pdata->num_col_gpios; i++)
> gpio_free(pdata->col_gpios[i]);
>
> diff --git a/include/linux/input/matrix_keypad.h b/include/linux/input/matrix_keypad.h
> index c964cd7..8e8dc2e 100644
> --- a/include/linux/input/matrix_keypad.h
> +++ b/include/linux/input/matrix_keypad.h
> @@ -63,6 +63,11 @@ struct matrix_keypad_platform_data {
> /* key debounce interval in milli-second */
> unsigned int debounce_ms;
>
> + /* used if interrupts of all row/column GPIOs are bundled to one single
> + * irq */
> + unsigned int clustered_irq;
> + unsigned int clustered_irq_flags;
> +
> bool active_low;
> bool wakeup;
> bool no_autorepeat;
> --
> 1.7.0
>
>
Otherwise looks OK to me.
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