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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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de3a00ef21
Calling device_init_wakeup in the remove function is unnecessary since the device is going away, and thus won't be able to cause any wakeups under any circumstances. Besides, the driver cleanup code already handles the necessary cleanup. Similarly, disabling wakeup in the probe error path is unnecessary, as is disabling wakeup in the probe function in the first place. Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
577 lines
14 KiB
C
577 lines
14 KiB
C
/*
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* GPIO driven matrix keyboard driver
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*
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* Copyright (c) 2008 Marek Vasut <marek.vasut@gmail.com>
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*
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* Based on corgikbd.c
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/types.h>
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#include <linux/delay.h>
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#include <linux/platform_device.h>
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#include <linux/input.h>
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#include <linux/irq.h>
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#include <linux/interrupt.h>
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#include <linux/jiffies.h>
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#include <linux/module.h>
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#include <linux/gpio.h>
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#include <linux/input/matrix_keypad.h>
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#include <linux/slab.h>
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#include <linux/of.h>
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#include <linux/of_gpio.h>
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#include <linux/of_platform.h>
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struct matrix_keypad {
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const struct matrix_keypad_platform_data *pdata;
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struct input_dev *input_dev;
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unsigned int row_shift;
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DECLARE_BITMAP(disabled_gpios, MATRIX_MAX_ROWS);
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uint32_t last_key_state[MATRIX_MAX_COLS];
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struct delayed_work work;
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spinlock_t lock;
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bool scan_pending;
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bool stopped;
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bool gpio_all_disabled;
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};
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/*
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* NOTE: normally the GPIO has to be put into HiZ when de-activated to cause
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* minmal side effect when scanning other columns, here it is configured to
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* be input, and it should work on most platforms.
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*/
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static void __activate_col(const struct matrix_keypad_platform_data *pdata,
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int col, bool on)
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{
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bool level_on = !pdata->active_low;
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if (on) {
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gpio_direction_output(pdata->col_gpios[col], level_on);
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} else {
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gpio_set_value_cansleep(pdata->col_gpios[col], !level_on);
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gpio_direction_input(pdata->col_gpios[col]);
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}
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}
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static void activate_col(const struct matrix_keypad_platform_data *pdata,
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int col, bool on)
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{
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__activate_col(pdata, col, on);
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if (on && pdata->col_scan_delay_us)
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udelay(pdata->col_scan_delay_us);
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}
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static void activate_all_cols(const struct matrix_keypad_platform_data *pdata,
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bool on)
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{
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int col;
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for (col = 0; col < pdata->num_col_gpios; col++)
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__activate_col(pdata, col, on);
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}
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static bool row_asserted(const struct matrix_keypad_platform_data *pdata,
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int row)
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{
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return gpio_get_value_cansleep(pdata->row_gpios[row]) ?
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!pdata->active_low : pdata->active_low;
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}
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static void enable_row_irqs(struct matrix_keypad *keypad)
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{
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const struct matrix_keypad_platform_data *pdata = keypad->pdata;
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int i;
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if (pdata->clustered_irq > 0)
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enable_irq(pdata->clustered_irq);
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else {
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for (i = 0; i < pdata->num_row_gpios; i++)
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enable_irq(gpio_to_irq(pdata->row_gpios[i]));
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}
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}
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static void disable_row_irqs(struct matrix_keypad *keypad)
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{
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const struct matrix_keypad_platform_data *pdata = keypad->pdata;
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int i;
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if (pdata->clustered_irq > 0)
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disable_irq_nosync(pdata->clustered_irq);
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else {
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for (i = 0; i < pdata->num_row_gpios; i++)
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disable_irq_nosync(gpio_to_irq(pdata->row_gpios[i]));
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}
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}
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/*
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* This gets the keys from keyboard and reports it to input subsystem
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*/
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static void matrix_keypad_scan(struct work_struct *work)
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{
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struct matrix_keypad *keypad =
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container_of(work, struct matrix_keypad, work.work);
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struct input_dev *input_dev = keypad->input_dev;
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const unsigned short *keycodes = input_dev->keycode;
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const struct matrix_keypad_platform_data *pdata = keypad->pdata;
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uint32_t new_state[MATRIX_MAX_COLS];
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int row, col, code;
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/* de-activate all columns for scanning */
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activate_all_cols(pdata, false);
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memset(new_state, 0, sizeof(new_state));
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/* assert each column and read the row status out */
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for (col = 0; col < pdata->num_col_gpios; col++) {
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activate_col(pdata, col, true);
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for (row = 0; row < pdata->num_row_gpios; row++)
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new_state[col] |=
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row_asserted(pdata, row) ? (1 << row) : 0;
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activate_col(pdata, col, false);
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}
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for (col = 0; col < pdata->num_col_gpios; col++) {
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uint32_t bits_changed;
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bits_changed = keypad->last_key_state[col] ^ new_state[col];
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if (bits_changed == 0)
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continue;
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for (row = 0; row < pdata->num_row_gpios; row++) {
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if ((bits_changed & (1 << row)) == 0)
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continue;
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code = MATRIX_SCAN_CODE(row, col, keypad->row_shift);
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input_event(input_dev, EV_MSC, MSC_SCAN, code);
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input_report_key(input_dev,
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keycodes[code],
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new_state[col] & (1 << row));
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}
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}
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input_sync(input_dev);
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memcpy(keypad->last_key_state, new_state, sizeof(new_state));
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activate_all_cols(pdata, true);
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/* Enable IRQs again */
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spin_lock_irq(&keypad->lock);
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keypad->scan_pending = false;
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enable_row_irqs(keypad);
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spin_unlock_irq(&keypad->lock);
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}
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static irqreturn_t matrix_keypad_interrupt(int irq, void *id)
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{
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struct matrix_keypad *keypad = id;
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unsigned long flags;
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spin_lock_irqsave(&keypad->lock, flags);
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/*
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* See if another IRQ beaten us to it and scheduled the
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* scan already. In that case we should not try to
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* disable IRQs again.
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*/
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if (unlikely(keypad->scan_pending || keypad->stopped))
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goto out;
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disable_row_irqs(keypad);
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keypad->scan_pending = true;
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schedule_delayed_work(&keypad->work,
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msecs_to_jiffies(keypad->pdata->debounce_ms));
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out:
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spin_unlock_irqrestore(&keypad->lock, flags);
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return IRQ_HANDLED;
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}
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static int matrix_keypad_start(struct input_dev *dev)
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{
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struct matrix_keypad *keypad = input_get_drvdata(dev);
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keypad->stopped = false;
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mb();
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/*
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* Schedule an immediate key scan to capture current key state;
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* columns will be activated and IRQs be enabled after the scan.
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*/
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schedule_delayed_work(&keypad->work, 0);
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return 0;
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}
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static void matrix_keypad_stop(struct input_dev *dev)
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{
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struct matrix_keypad *keypad = input_get_drvdata(dev);
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keypad->stopped = true;
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mb();
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flush_work(&keypad->work.work);
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/*
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* matrix_keypad_scan() will leave IRQs enabled;
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* we should disable them now.
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*/
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disable_row_irqs(keypad);
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}
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#ifdef CONFIG_PM_SLEEP
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static void matrix_keypad_enable_wakeup(struct matrix_keypad *keypad)
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{
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const struct matrix_keypad_platform_data *pdata = keypad->pdata;
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unsigned int gpio;
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int i;
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if (pdata->clustered_irq > 0) {
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if (enable_irq_wake(pdata->clustered_irq) == 0)
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keypad->gpio_all_disabled = true;
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} else {
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for (i = 0; i < pdata->num_row_gpios; i++) {
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if (!test_bit(i, keypad->disabled_gpios)) {
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gpio = pdata->row_gpios[i];
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if (enable_irq_wake(gpio_to_irq(gpio)) == 0)
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__set_bit(i, keypad->disabled_gpios);
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}
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}
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}
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}
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static void matrix_keypad_disable_wakeup(struct matrix_keypad *keypad)
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{
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const struct matrix_keypad_platform_data *pdata = keypad->pdata;
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unsigned int gpio;
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int i;
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if (pdata->clustered_irq > 0) {
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if (keypad->gpio_all_disabled) {
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disable_irq_wake(pdata->clustered_irq);
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keypad->gpio_all_disabled = false;
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}
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} else {
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for (i = 0; i < pdata->num_row_gpios; i++) {
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if (test_and_clear_bit(i, keypad->disabled_gpios)) {
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gpio = pdata->row_gpios[i];
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disable_irq_wake(gpio_to_irq(gpio));
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}
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}
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}
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}
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static int matrix_keypad_suspend(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct matrix_keypad *keypad = platform_get_drvdata(pdev);
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matrix_keypad_stop(keypad->input_dev);
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if (device_may_wakeup(&pdev->dev))
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matrix_keypad_enable_wakeup(keypad);
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return 0;
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}
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static int matrix_keypad_resume(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct matrix_keypad *keypad = platform_get_drvdata(pdev);
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if (device_may_wakeup(&pdev->dev))
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matrix_keypad_disable_wakeup(keypad);
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matrix_keypad_start(keypad->input_dev);
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return 0;
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}
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#endif
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static SIMPLE_DEV_PM_OPS(matrix_keypad_pm_ops,
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matrix_keypad_suspend, matrix_keypad_resume);
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static int matrix_keypad_init_gpio(struct platform_device *pdev,
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struct matrix_keypad *keypad)
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{
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const struct matrix_keypad_platform_data *pdata = keypad->pdata;
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int i, err;
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/* initialized strobe lines as outputs, activated */
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for (i = 0; i < pdata->num_col_gpios; i++) {
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err = gpio_request(pdata->col_gpios[i], "matrix_kbd_col");
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if (err) {
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dev_err(&pdev->dev,
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"failed to request GPIO%d for COL%d\n",
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pdata->col_gpios[i], i);
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goto err_free_cols;
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}
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gpio_direction_output(pdata->col_gpios[i], !pdata->active_low);
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}
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for (i = 0; i < pdata->num_row_gpios; i++) {
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err = gpio_request(pdata->row_gpios[i], "matrix_kbd_row");
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if (err) {
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dev_err(&pdev->dev,
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"failed to request GPIO%d for ROW%d\n",
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pdata->row_gpios[i], i);
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goto err_free_rows;
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}
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gpio_direction_input(pdata->row_gpios[i]);
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}
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if (pdata->clustered_irq > 0) {
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err = request_any_context_irq(pdata->clustered_irq,
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matrix_keypad_interrupt,
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pdata->clustered_irq_flags,
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"matrix-keypad", keypad);
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if (err < 0) {
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dev_err(&pdev->dev,
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"Unable to acquire clustered interrupt\n");
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goto err_free_rows;
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}
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} else {
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for (i = 0; i < pdata->num_row_gpios; i++) {
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err = request_any_context_irq(
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gpio_to_irq(pdata->row_gpios[i]),
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matrix_keypad_interrupt,
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IRQF_TRIGGER_RISING |
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IRQF_TRIGGER_FALLING,
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"matrix-keypad", keypad);
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if (err < 0) {
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dev_err(&pdev->dev,
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"Unable to acquire interrupt for GPIO line %i\n",
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pdata->row_gpios[i]);
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goto err_free_irqs;
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}
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}
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}
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/* initialized as disabled - enabled by input->open */
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disable_row_irqs(keypad);
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return 0;
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err_free_irqs:
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while (--i >= 0)
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free_irq(gpio_to_irq(pdata->row_gpios[i]), keypad);
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i = pdata->num_row_gpios;
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err_free_rows:
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while (--i >= 0)
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gpio_free(pdata->row_gpios[i]);
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i = pdata->num_col_gpios;
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err_free_cols:
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while (--i >= 0)
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gpio_free(pdata->col_gpios[i]);
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return err;
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}
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static void matrix_keypad_free_gpio(struct matrix_keypad *keypad)
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{
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const struct matrix_keypad_platform_data *pdata = keypad->pdata;
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int i;
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if (pdata->clustered_irq > 0) {
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free_irq(pdata->clustered_irq, keypad);
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} else {
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for (i = 0; i < pdata->num_row_gpios; i++)
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free_irq(gpio_to_irq(pdata->row_gpios[i]), keypad);
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}
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for (i = 0; i < pdata->num_row_gpios; i++)
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gpio_free(pdata->row_gpios[i]);
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for (i = 0; i < pdata->num_col_gpios; i++)
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gpio_free(pdata->col_gpios[i]);
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}
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#ifdef CONFIG_OF
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static struct matrix_keypad_platform_data *
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matrix_keypad_parse_dt(struct device *dev)
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{
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struct matrix_keypad_platform_data *pdata;
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struct device_node *np = dev->of_node;
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unsigned int *gpios;
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int i, nrow, ncol;
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if (!np) {
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dev_err(dev, "device lacks DT data\n");
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return ERR_PTR(-ENODEV);
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}
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pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
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if (!pdata) {
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dev_err(dev, "could not allocate memory for platform data\n");
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return ERR_PTR(-ENOMEM);
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}
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pdata->num_row_gpios = nrow = of_gpio_named_count(np, "row-gpios");
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pdata->num_col_gpios = ncol = of_gpio_named_count(np, "col-gpios");
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if (nrow <= 0 || ncol <= 0) {
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dev_err(dev, "number of keypad rows/columns not specified\n");
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return ERR_PTR(-EINVAL);
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}
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if (of_get_property(np, "linux,no-autorepeat", NULL))
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pdata->no_autorepeat = true;
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pdata->wakeup = of_property_read_bool(np, "wakeup-source") ||
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of_property_read_bool(np, "linux,wakeup"); /* legacy */
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if (of_get_property(np, "gpio-activelow", NULL))
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pdata->active_low = true;
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of_property_read_u32(np, "debounce-delay-ms", &pdata->debounce_ms);
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of_property_read_u32(np, "col-scan-delay-us",
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&pdata->col_scan_delay_us);
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gpios = devm_kzalloc(dev,
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sizeof(unsigned int) *
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(pdata->num_row_gpios + pdata->num_col_gpios),
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GFP_KERNEL);
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if (!gpios) {
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dev_err(dev, "could not allocate memory for gpios\n");
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return ERR_PTR(-ENOMEM);
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}
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for (i = 0; i < pdata->num_row_gpios; i++)
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gpios[i] = of_get_named_gpio(np, "row-gpios", i);
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for (i = 0; i < pdata->num_col_gpios; i++)
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gpios[pdata->num_row_gpios + i] =
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of_get_named_gpio(np, "col-gpios", i);
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pdata->row_gpios = gpios;
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pdata->col_gpios = &gpios[pdata->num_row_gpios];
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return pdata;
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}
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#else
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static inline struct matrix_keypad_platform_data *
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matrix_keypad_parse_dt(struct device *dev)
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{
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dev_err(dev, "no platform data defined\n");
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return ERR_PTR(-EINVAL);
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}
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#endif
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static int matrix_keypad_probe(struct platform_device *pdev)
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{
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const struct matrix_keypad_platform_data *pdata;
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struct matrix_keypad *keypad;
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struct input_dev *input_dev;
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int err;
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pdata = dev_get_platdata(&pdev->dev);
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if (!pdata) {
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pdata = matrix_keypad_parse_dt(&pdev->dev);
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if (IS_ERR(pdata)) {
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dev_err(&pdev->dev, "no platform data defined\n");
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return PTR_ERR(pdata);
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}
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} else if (!pdata->keymap_data) {
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dev_err(&pdev->dev, "no keymap data defined\n");
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return -EINVAL;
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}
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keypad = kzalloc(sizeof(struct matrix_keypad), GFP_KERNEL);
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input_dev = input_allocate_device();
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if (!keypad || !input_dev) {
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err = -ENOMEM;
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goto err_free_mem;
|
|
}
|
|
|
|
keypad->input_dev = input_dev;
|
|
keypad->pdata = pdata;
|
|
keypad->row_shift = get_count_order(pdata->num_col_gpios);
|
|
keypad->stopped = true;
|
|
INIT_DELAYED_WORK(&keypad->work, matrix_keypad_scan);
|
|
spin_lock_init(&keypad->lock);
|
|
|
|
input_dev->name = pdev->name;
|
|
input_dev->id.bustype = BUS_HOST;
|
|
input_dev->dev.parent = &pdev->dev;
|
|
input_dev->open = matrix_keypad_start;
|
|
input_dev->close = matrix_keypad_stop;
|
|
|
|
err = matrix_keypad_build_keymap(pdata->keymap_data, NULL,
|
|
pdata->num_row_gpios,
|
|
pdata->num_col_gpios,
|
|
NULL, input_dev);
|
|
if (err) {
|
|
dev_err(&pdev->dev, "failed to build keymap\n");
|
|
goto err_free_mem;
|
|
}
|
|
|
|
if (!pdata->no_autorepeat)
|
|
__set_bit(EV_REP, input_dev->evbit);
|
|
input_set_capability(input_dev, EV_MSC, MSC_SCAN);
|
|
input_set_drvdata(input_dev, keypad);
|
|
|
|
err = matrix_keypad_init_gpio(pdev, keypad);
|
|
if (err)
|
|
goto err_free_mem;
|
|
|
|
err = input_register_device(keypad->input_dev);
|
|
if (err)
|
|
goto err_free_gpio;
|
|
|
|
device_init_wakeup(&pdev->dev, pdata->wakeup);
|
|
platform_set_drvdata(pdev, keypad);
|
|
|
|
return 0;
|
|
|
|
err_free_gpio:
|
|
matrix_keypad_free_gpio(keypad);
|
|
err_free_mem:
|
|
input_free_device(input_dev);
|
|
kfree(keypad);
|
|
return err;
|
|
}
|
|
|
|
static int matrix_keypad_remove(struct platform_device *pdev)
|
|
{
|
|
struct matrix_keypad *keypad = platform_get_drvdata(pdev);
|
|
|
|
matrix_keypad_free_gpio(keypad);
|
|
input_unregister_device(keypad->input_dev);
|
|
kfree(keypad);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_OF
|
|
static const struct of_device_id matrix_keypad_dt_match[] = {
|
|
{ .compatible = "gpio-matrix-keypad" },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, matrix_keypad_dt_match);
|
|
#endif
|
|
|
|
static struct platform_driver matrix_keypad_driver = {
|
|
.probe = matrix_keypad_probe,
|
|
.remove = matrix_keypad_remove,
|
|
.driver = {
|
|
.name = "matrix-keypad",
|
|
.pm = &matrix_keypad_pm_ops,
|
|
.of_match_table = of_match_ptr(matrix_keypad_dt_match),
|
|
},
|
|
};
|
|
module_platform_driver(matrix_keypad_driver);
|
|
|
|
MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
|
|
MODULE_DESCRIPTION("GPIO Driven Matrix Keypad Driver");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_ALIAS("platform:matrix-keypad");
|