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@@ -0,0 +1,453 @@
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+/*
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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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+
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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/init.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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+
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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 short *keycodes;
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+
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+ uint32_t last_key_state[MATRIX_MAX_COLS];
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+ struct delayed_work work;
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+ bool scan_pending;
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+ bool stopped;
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+ spinlock_t lock;
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+};
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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 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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+
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+ /* de-activate all columns for scanning */
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+ activate_all_cols(pdata, false);
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+
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+ memset(new_state, 0, sizeof(new_state));
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+
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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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+
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+ activate_col(pdata, col, true);
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+
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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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+
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+ activate_col(pdata, col, false);
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+ }
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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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+
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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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+
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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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+
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+ code = (row << 4) + col;
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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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+ keypad->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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+
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+ memcpy(keypad->last_key_state, new_state, sizeof(new_state));
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+
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+ activate_all_cols(pdata, true);
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+
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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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+
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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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+
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+ spin_lock_irqsave(&keypad->lock, flags);
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+
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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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+
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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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+
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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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+
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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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+
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+ keypad->stopped = false;
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+ mb();
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+
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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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+
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+ return 0;
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+}
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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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+
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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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+
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+#ifdef CONFIG_PM
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+static int matrix_keypad_suspend(struct platform_device *pdev, pm_message_t state)
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+{
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+ struct matrix_keypad *keypad = platform_get_drvdata(pdev);
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+ const struct matrix_keypad_platform_data *pdata = keypad->pdata;
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+ int i;
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+
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+ matrix_keypad_stop(keypad->input_dev);
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+
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+ if (device_may_wakeup(&pdev->dev))
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+ for (i = 0; i < pdata->num_row_gpios; i++)
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+ enable_irq_wake(gpio_to_irq(pdata->row_gpios[i]));
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+
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+ return 0;
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+}
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+
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+static int matrix_keypad_resume(struct platform_device *pdev)
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+{
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+ struct matrix_keypad *keypad = platform_get_drvdata(pdev);
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+ const struct matrix_keypad_platform_data *pdata = keypad->pdata;
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+ int i;
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+
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+ if (device_may_wakeup(&pdev->dev))
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+ for (i = 0; i < pdata->num_row_gpios; i++)
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+ disable_irq_wake(gpio_to_irq(pdata->row_gpios[i]));
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+
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+ matrix_keypad_start(keypad->input_dev);
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+
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+ return 0;
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+}
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+#else
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+#define matrix_keypad_suspend NULL
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+#define matrix_keypad_resume NULL
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+#endif
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+
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+static int __devinit init_matrix_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 = -EINVAL;
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+
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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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+
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+ gpio_direction_output(pdata->col_gpios[i], !pdata->active_low);
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+ }
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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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+
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+ gpio_direction_input(pdata->row_gpios[i]);
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+ }
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+
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+ for (i = 0; i < pdata->num_row_gpios; i++) {
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+ err = request_irq(gpio_to_irq(pdata->row_gpios[i]),
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+ matrix_keypad_interrupt,
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+ IRQF_DISABLED |
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+ IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
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+ "matrix-keypad", keypad);
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+ if (err) {
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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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+
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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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+
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+ return err;
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+}
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+
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+static int __devinit 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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+ const struct matrix_keymap_data *keymap_data;
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+ struct matrix_keypad *keypad;
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+ struct input_dev *input_dev;
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+ unsigned short *keycodes;
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+ int i;
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+ int err;
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+
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+ pdata = pdev->dev.platform_data;
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+ if (!pdata) {
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+ dev_err(&pdev->dev, "no platform data defined\n");
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+ return -EINVAL;
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+ }
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+
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+ keymap_data = pdata->keymap_data;
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+ if (!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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+
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+ if (!keymap_data->max_keymap_size) {
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+ dev_err(&pdev->dev, "invalid keymap data supplied\n");
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+ return -EINVAL;
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+ }
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+
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+ keypad = kzalloc(sizeof(struct matrix_keypad), GFP_KERNEL);
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+ keycodes = kzalloc(keymap_data->max_keymap_size *
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+ sizeof(keypad->keycodes),
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+ GFP_KERNEL);
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+ input_dev = input_allocate_device();
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+ if (!keypad || !keycodes || !input_dev) {
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+ err = -ENOMEM;
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+ goto err_free_mem;
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+ }
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+
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+ keypad->input_dev = input_dev;
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+ keypad->pdata = pdata;
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+ keypad->keycodes = keycodes;
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+ keypad->stopped = true;
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+ INIT_DELAYED_WORK(&keypad->work, matrix_keypad_scan);
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+ spin_lock_init(&keypad->lock);
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+
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+ input_dev->name = pdev->name;
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+ input_dev->id.bustype = BUS_HOST;
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+ input_dev->dev.parent = &pdev->dev;
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+ input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
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+ input_dev->open = matrix_keypad_start;
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+ input_dev->close = matrix_keypad_stop;
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+
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+ input_dev->keycode = keycodes;
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+ input_dev->keycodesize = sizeof(*keycodes);
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+ input_dev->keycodemax = keymap_data->max_keymap_size;
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+
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+ for (i = 0; i < keymap_data->keymap_size; i++) {
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+ unsigned int key = keymap_data->keymap[i];
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+ unsigned int row = KEY_ROW(key);
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+ unsigned int col = KEY_COL(key);
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+ unsigned short code = KEY_VAL(key);
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+
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+ keycodes[(row << 4) + col] = code;
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+ __set_bit(code, input_dev->keybit);
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+ }
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+ __clear_bit(KEY_RESERVED, input_dev->keybit);
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+
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+ input_set_capability(input_dev, EV_MSC, MSC_SCAN);
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+ input_set_drvdata(input_dev, keypad);
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+
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+ err = init_matrix_gpio(pdev, keypad);
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+ if (err)
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+ goto err_free_mem;
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+
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+ err = input_register_device(keypad->input_dev);
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+ if (err)
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+ goto err_free_mem;
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+
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+ device_init_wakeup(&pdev->dev, pdata->wakeup);
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+ platform_set_drvdata(pdev, keypad);
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+
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+ return 0;
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+
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+err_free_mem:
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+ input_free_device(input_dev);
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+ kfree(keycodes);
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+ kfree(keypad);
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+ return err;
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+}
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+
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+static int __devexit matrix_keypad_remove(struct platform_device *pdev)
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+{
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+ struct matrix_keypad *keypad = platform_get_drvdata(pdev);
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+ const struct matrix_keypad_platform_data *pdata = keypad->pdata;
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+ int i;
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+
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+ device_init_wakeup(&pdev->dev, 0);
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+
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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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+ gpio_free(pdata->row_gpios[i]);
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+ }
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+
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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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+ input_unregister_device(keypad->input_dev);
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+ platform_set_drvdata(pdev, NULL);
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+ kfree(keypad->keycodes);
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+ kfree(keypad);
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+
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+ return 0;
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+}
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+
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+static struct platform_driver matrix_keypad_driver = {
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+ .probe = matrix_keypad_probe,
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+ .remove = __devexit_p(matrix_keypad_remove),
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+ .suspend = matrix_keypad_suspend,
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+ .resume = matrix_keypad_resume,
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+ .driver = {
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+ .name = "matrix-keypad",
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+ .owner = THIS_MODULE,
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+ },
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+};
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+
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+static int __init matrix_keypad_init(void)
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+{
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+ return platform_driver_register(&matrix_keypad_driver);
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+}
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+
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+static void __exit matrix_keypad_exit(void)
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+{
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+ platform_driver_unregister(&matrix_keypad_driver);
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+}
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+
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+module_init(matrix_keypad_init);
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+module_exit(matrix_keypad_exit);
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+
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+MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
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+MODULE_DESCRIPTION("GPIO Driven Matrix Keypad Driver");
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+MODULE_LICENSE("GPL v2");
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+MODULE_ALIAS("platform:matrix-keypad");
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Linus Torvalds