380 строки
9.0 KiB
C
380 строки
9.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Driver for the Cirrus EP93xx matrix keypad controller.
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*
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* Copyright (c) 2008 H Hartley Sweeten <hsweeten@visionengravers.com>
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*
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* Based on the pxa27x matrix keypad controller by Rodolfo Giometti.
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*
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* NOTE:
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*
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* The 3-key reset is triggered by pressing the 3 keys in
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* Row 0, Columns 2, 4, and 7 at the same time. This action can
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* be disabled by setting the EP93XX_KEYPAD_DISABLE_3_KEY flag.
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*
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* Normal operation for the matrix does not autorepeat the key press.
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* This action can be enabled by setting the EP93XX_KEYPAD_AUTOREPEAT
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* flag.
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*/
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/interrupt.h>
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#include <linux/clk.h>
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#include <linux/io.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/soc/cirrus/ep93xx.h>
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#include <linux/platform_data/keypad-ep93xx.h>
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/*
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* Keypad Interface Register offsets
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*/
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#define KEY_INIT 0x00 /* Key Scan Initialization register */
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#define KEY_DIAG 0x04 /* Key Scan Diagnostic register */
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#define KEY_REG 0x08 /* Key Value Capture register */
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/* Key Scan Initialization Register bit defines */
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#define KEY_INIT_DBNC_MASK (0x00ff0000)
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#define KEY_INIT_DBNC_SHIFT (16)
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#define KEY_INIT_DIS3KY (1<<15)
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#define KEY_INIT_DIAG (1<<14)
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#define KEY_INIT_BACK (1<<13)
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#define KEY_INIT_T2 (1<<12)
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#define KEY_INIT_PRSCL_MASK (0x000003ff)
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#define KEY_INIT_PRSCL_SHIFT (0)
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/* Key Scan Diagnostic Register bit defines */
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#define KEY_DIAG_MASK (0x0000003f)
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#define KEY_DIAG_SHIFT (0)
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/* Key Value Capture Register bit defines */
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#define KEY_REG_K (1<<15)
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#define KEY_REG_INT (1<<14)
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#define KEY_REG_2KEYS (1<<13)
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#define KEY_REG_1KEY (1<<12)
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#define KEY_REG_KEY2_MASK (0x00000fc0)
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#define KEY_REG_KEY2_SHIFT (6)
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#define KEY_REG_KEY1_MASK (0x0000003f)
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#define KEY_REG_KEY1_SHIFT (0)
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#define EP93XX_MATRIX_SIZE (EP93XX_MATRIX_ROWS * EP93XX_MATRIX_COLS)
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struct ep93xx_keypad {
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struct ep93xx_keypad_platform_data *pdata;
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struct input_dev *input_dev;
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struct clk *clk;
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void __iomem *mmio_base;
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unsigned short keycodes[EP93XX_MATRIX_SIZE];
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int key1;
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int key2;
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int irq;
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bool enabled;
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};
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static irqreturn_t ep93xx_keypad_irq_handler(int irq, void *dev_id)
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{
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struct ep93xx_keypad *keypad = dev_id;
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struct input_dev *input_dev = keypad->input_dev;
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unsigned int status;
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int keycode, key1, key2;
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status = __raw_readl(keypad->mmio_base + KEY_REG);
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keycode = (status & KEY_REG_KEY1_MASK) >> KEY_REG_KEY1_SHIFT;
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key1 = keypad->keycodes[keycode];
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keycode = (status & KEY_REG_KEY2_MASK) >> KEY_REG_KEY2_SHIFT;
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key2 = keypad->keycodes[keycode];
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if (status & KEY_REG_2KEYS) {
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if (keypad->key1 && key1 != keypad->key1 && key2 != keypad->key1)
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input_report_key(input_dev, keypad->key1, 0);
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if (keypad->key2 && key1 != keypad->key2 && key2 != keypad->key2)
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input_report_key(input_dev, keypad->key2, 0);
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input_report_key(input_dev, key1, 1);
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input_report_key(input_dev, key2, 1);
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keypad->key1 = key1;
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keypad->key2 = key2;
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} else if (status & KEY_REG_1KEY) {
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if (keypad->key1 && key1 != keypad->key1)
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input_report_key(input_dev, keypad->key1, 0);
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if (keypad->key2 && key1 != keypad->key2)
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input_report_key(input_dev, keypad->key2, 0);
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input_report_key(input_dev, key1, 1);
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keypad->key1 = key1;
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keypad->key2 = 0;
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} else {
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input_report_key(input_dev, keypad->key1, 0);
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input_report_key(input_dev, keypad->key2, 0);
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keypad->key1 = keypad->key2 = 0;
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}
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input_sync(input_dev);
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return IRQ_HANDLED;
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}
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static void ep93xx_keypad_config(struct ep93xx_keypad *keypad)
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{
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struct ep93xx_keypad_platform_data *pdata = keypad->pdata;
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unsigned int val = 0;
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clk_set_rate(keypad->clk, pdata->clk_rate);
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if (pdata->flags & EP93XX_KEYPAD_DISABLE_3_KEY)
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val |= KEY_INIT_DIS3KY;
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if (pdata->flags & EP93XX_KEYPAD_DIAG_MODE)
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val |= KEY_INIT_DIAG;
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if (pdata->flags & EP93XX_KEYPAD_BACK_DRIVE)
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val |= KEY_INIT_BACK;
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if (pdata->flags & EP93XX_KEYPAD_TEST_MODE)
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val |= KEY_INIT_T2;
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val |= ((pdata->debounce << KEY_INIT_DBNC_SHIFT) & KEY_INIT_DBNC_MASK);
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val |= ((pdata->prescale << KEY_INIT_PRSCL_SHIFT) & KEY_INIT_PRSCL_MASK);
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__raw_writel(val, keypad->mmio_base + KEY_INIT);
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}
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static int ep93xx_keypad_open(struct input_dev *pdev)
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{
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struct ep93xx_keypad *keypad = input_get_drvdata(pdev);
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if (!keypad->enabled) {
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ep93xx_keypad_config(keypad);
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clk_prepare_enable(keypad->clk);
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keypad->enabled = true;
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}
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return 0;
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}
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static void ep93xx_keypad_close(struct input_dev *pdev)
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{
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struct ep93xx_keypad *keypad = input_get_drvdata(pdev);
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if (keypad->enabled) {
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clk_disable_unprepare(keypad->clk);
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keypad->enabled = false;
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}
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}
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#ifdef CONFIG_PM_SLEEP
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static int ep93xx_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 ep93xx_keypad *keypad = platform_get_drvdata(pdev);
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struct input_dev *input_dev = keypad->input_dev;
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mutex_lock(&input_dev->mutex);
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if (keypad->enabled) {
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clk_disable(keypad->clk);
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keypad->enabled = false;
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}
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mutex_unlock(&input_dev->mutex);
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if (device_may_wakeup(&pdev->dev))
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enable_irq_wake(keypad->irq);
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return 0;
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}
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static int ep93xx_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 ep93xx_keypad *keypad = platform_get_drvdata(pdev);
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struct input_dev *input_dev = keypad->input_dev;
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if (device_may_wakeup(&pdev->dev))
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disable_irq_wake(keypad->irq);
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mutex_lock(&input_dev->mutex);
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if (input_device_enabled(input_dev)) {
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if (!keypad->enabled) {
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ep93xx_keypad_config(keypad);
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clk_enable(keypad->clk);
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keypad->enabled = true;
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}
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}
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mutex_unlock(&input_dev->mutex);
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return 0;
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}
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#endif
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static SIMPLE_DEV_PM_OPS(ep93xx_keypad_pm_ops,
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ep93xx_keypad_suspend, ep93xx_keypad_resume);
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static int ep93xx_keypad_probe(struct platform_device *pdev)
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{
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struct ep93xx_keypad *keypad;
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const struct matrix_keymap_data *keymap_data;
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struct input_dev *input_dev;
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struct resource *res;
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int err;
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keypad = kzalloc(sizeof(struct ep93xx_keypad), GFP_KERNEL);
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if (!keypad)
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return -ENOMEM;
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keypad->pdata = dev_get_platdata(&pdev->dev);
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if (!keypad->pdata) {
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err = -EINVAL;
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goto failed_free;
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}
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keymap_data = keypad->pdata->keymap_data;
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if (!keymap_data) {
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err = -EINVAL;
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goto failed_free;
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}
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keypad->irq = platform_get_irq(pdev, 0);
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if (keypad->irq < 0) {
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err = keypad->irq;
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goto failed_free;
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}
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res) {
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err = -ENXIO;
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goto failed_free;
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}
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res = request_mem_region(res->start, resource_size(res), pdev->name);
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if (!res) {
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err = -EBUSY;
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goto failed_free;
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}
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keypad->mmio_base = ioremap(res->start, resource_size(res));
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if (keypad->mmio_base == NULL) {
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err = -ENXIO;
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goto failed_free_mem;
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}
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err = ep93xx_keypad_acquire_gpio(pdev);
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if (err)
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goto failed_free_io;
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keypad->clk = clk_get(&pdev->dev, NULL);
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if (IS_ERR(keypad->clk)) {
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err = PTR_ERR(keypad->clk);
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goto failed_free_gpio;
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}
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input_dev = input_allocate_device();
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if (!input_dev) {
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err = -ENOMEM;
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goto failed_put_clk;
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}
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keypad->input_dev = input_dev;
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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->open = ep93xx_keypad_open;
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input_dev->close = ep93xx_keypad_close;
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input_dev->dev.parent = &pdev->dev;
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err = matrix_keypad_build_keymap(keymap_data, NULL,
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EP93XX_MATRIX_ROWS, EP93XX_MATRIX_COLS,
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keypad->keycodes, input_dev);
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if (err)
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goto failed_free_dev;
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if (keypad->pdata->flags & EP93XX_KEYPAD_AUTOREPEAT)
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__set_bit(EV_REP, input_dev->evbit);
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input_set_drvdata(input_dev, keypad);
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err = request_irq(keypad->irq, ep93xx_keypad_irq_handler,
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0, pdev->name, keypad);
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if (err)
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goto failed_free_dev;
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err = input_register_device(input_dev);
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if (err)
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goto failed_free_irq;
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platform_set_drvdata(pdev, keypad);
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device_init_wakeup(&pdev->dev, 1);
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return 0;
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failed_free_irq:
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free_irq(keypad->irq, keypad);
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failed_free_dev:
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input_free_device(input_dev);
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failed_put_clk:
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clk_put(keypad->clk);
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failed_free_gpio:
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ep93xx_keypad_release_gpio(pdev);
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failed_free_io:
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iounmap(keypad->mmio_base);
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failed_free_mem:
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release_mem_region(res->start, resource_size(res));
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failed_free:
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kfree(keypad);
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return err;
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}
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static int ep93xx_keypad_remove(struct platform_device *pdev)
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{
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struct ep93xx_keypad *keypad = platform_get_drvdata(pdev);
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struct resource *res;
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free_irq(keypad->irq, keypad);
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if (keypad->enabled)
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clk_disable(keypad->clk);
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clk_put(keypad->clk);
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input_unregister_device(keypad->input_dev);
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ep93xx_keypad_release_gpio(pdev);
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iounmap(keypad->mmio_base);
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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release_mem_region(res->start, resource_size(res));
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kfree(keypad);
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return 0;
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}
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static struct platform_driver ep93xx_keypad_driver = {
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.driver = {
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.name = "ep93xx-keypad",
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.pm = &ep93xx_keypad_pm_ops,
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},
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.probe = ep93xx_keypad_probe,
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.remove = ep93xx_keypad_remove,
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};
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module_platform_driver(ep93xx_keypad_driver);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("H Hartley Sweeten <hsweeten@visionengravers.com>");
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MODULE_DESCRIPTION("EP93xx Matrix Keypad Controller");
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MODULE_ALIAS("platform:ep93xx-keypad");
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