From dd219234d201431d0fc56a74e3a4a97ca3eb4589 Mon Sep 17 00:00:00 2001 From: Dmitry Torokhov Date: Thu, 24 Dec 2009 22:50:23 -0800 Subject: [PATCH] Input: matrix-keypad - handle cases when GPIOs can't be wakeup sources On certain boards not all GPIOs may be used as wakeup sources, in which case some of enable_irq_wake() calls will fail. On resume calling disable_irq_wake() will warn about unbalanced IRQ wake disable. Solve this by checking whether enable_irq_wake() succeeded or not and no not call disable_irq_wake() for these GPIOs/IRQs that have not been enabled. Reported-by: Pavel Machek Signed-off-by: Dmitry Torokhov --- drivers/input/keyboard/matrix_keypad.c | 29 +++++++++++++++++++------- 1 file changed, 22 insertions(+), 7 deletions(-) diff --git a/drivers/input/keyboard/matrix_keypad.c b/drivers/input/keyboard/matrix_keypad.c index 34f4a29d4973..d3c8b61a941d 100644 --- a/drivers/input/keyboard/matrix_keypad.c +++ b/drivers/input/keyboard/matrix_keypad.c @@ -29,11 +29,13 @@ struct matrix_keypad { unsigned short *keycodes; unsigned int row_shift; + DECLARE_BITMAP(disabled_gpios, MATRIX_MAX_ROWS); + uint32_t last_key_state[MATRIX_MAX_COLS]; struct delayed_work work; + spinlock_t lock; bool scan_pending; bool stopped; - spinlock_t lock; }; /* @@ -222,9 +224,16 @@ static int matrix_keypad_suspend(struct device *dev) matrix_keypad_stop(keypad->input_dev); - if (device_may_wakeup(&pdev->dev)) - for (i = 0; i < pdata->num_row_gpios; i++) - enable_irq_wake(gpio_to_irq(pdata->row_gpios[i])); + if (device_may_wakeup(&pdev->dev)) { + for (i = 0; i < pdata->num_row_gpios; i++) { + if (!test_bit(i, keypad->disabled_gpios)) { + unsigned int gpio = pdata->row_gpios[i]; + + if (enable_irq_wake(gpio_to_irq(gpio)) == 0) + __set_bit(i, keypad->disabled_gpios); + } + } + } return 0; } @@ -236,9 +245,15 @@ static int matrix_keypad_resume(struct device *dev) const struct matrix_keypad_platform_data *pdata = keypad->pdata; int i; - if (device_may_wakeup(&pdev->dev)) - for (i = 0; i < pdata->num_row_gpios; i++) - disable_irq_wake(gpio_to_irq(pdata->row_gpios[i])); + if (device_may_wakeup(&pdev->dev)) { + 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]; + + disable_irq_wake(gpio_to_irq(gpio)); + } + } + } matrix_keypad_start(keypad->input_dev); -- 2.20.1