OK6410矩阵键盘驱动 linux2.6.36
OK6410矩阵键盘驱动 linux2.6.36
实现了4*4的矩阵键盘驱动,
参考文档
需要注明一点的是:
void samsung_keypad_cfg_gpio(unsigned int rows, unsigned int cols)函数的位置:
arch/arm/mach-s3c64xx/setup-keypad.c 修改方法如下:
- voidsamsung_keypad_cfg_gpio(unsigned int rows, unsigned int cols)
- {
- unsignedint gpio;
- unsignedint end;
- /*Set all the necessary GPK pins to special-function 3: KP_ROW[x] */
- end= S3C64XX_GPK(8 + rows);
此外,还需要修改一点,代码原先为2*8的矩阵键盘,需修改为4*4的矩阵键盘
在arch/arm/mach-s3c64xx/mach-smdk6410.c中,在380行中修改为如下:
- static struct samsung_keypad_platdata smdk6410_keypad_data _initdata={
- .keymap_data = & smdk6410_keymap_data,
- .rows = 4,
- .cols = 4,
- };
整个代码如下:
samsung-keypad,c :
- /*
- * Samsung keypad driver
- *
- * Copyright (C) 2010 Samsung Electronics Co.Ltd
- * Author: Joonyoung Shim <jy0922.shim@samsung.com>
- * Author: Donghwa Lee <dh09.lee@samsung.com>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2 of the License, or (at your
- * option) any later version.
- */
- #include <linux/clk.h>
- #include <linux/delay.h>
- #include <linux/err.h>
- #include <linux/init.h>
- #include <linux/input.h>
- #include <linux/interrupt.h>
- #include <linux/io.h>
- #include <linux/module.h>
- #include <linux/platform_device.h>
- #include <linux/slab.h>
- #include <linux/sched.h>
- #include <plat/keypad.h>
- #define SAMSUNG_KEYIFCON 0x00
- #define SAMSUNG_KEYIFSTSCLR 0x04
- #define SAMSUNG_KEYIFCOL 0x08
- #define SAMSUNG_KEYIFROW 0x0c
- #define SAMSUNG_KEYIFFC 0x10
- /* SAMSUNG_KEYIFCON */
- #define SAMSUNG_KEYIFCON_INT_F_EN (1 << 0)
- #define SAMSUNG_KEYIFCON_INT_R_EN (1 << 1)
- #define SAMSUNG_KEYIFCON_DF_EN (1 << 2)
- #define SAMSUNG_KEYIFCON_FC_EN (1 << 3)
- #define SAMSUNG_KEYIFCON_WAKEUPEN (1 << 4)
- /* SAMSUNG_KEYIFSTSCLR */
- #define SAMSUNG_KEYIFSTSCLR_P_INT_MASK (0xff << 0)
- #define SAMSUNG_KEYIFSTSCLR_R_INT_MASK (0xff << 8)
- #define SAMSUNG_KEYIFSTSCLR_R_INT_OFFSET 8
- #define S5PV210_KEYIFSTSCLR_P_INT_MASK (0x3fff << 0)
- #define S5PV210_KEYIFSTSCLR_R_INT_MASK (0x3fff << 16)
- #define S5PV210_KEYIFSTSCLR_R_INT_OFFSET 16
- /* SAMSUNG_KEYIFCOL */
- #define SAMSUNG_KEYIFCOL_MASK (0xff << 0)
- #define S5PV210_KEYIFCOLEN_MASK (0xff << 8)
- unsigned int keypad_keycode[] = {'1','2','3','4','5','6','7','8','9','A','B','C','D','E','F','G'};
- /* SAMSUNG_KEYIFROW */
- #define SAMSUNG_KEYIFROW_MASK (0xff << 0)
- #define S5PV210_KEYIFROW_MASK (0x3fff << 0)
- /* SAMSUNG_KEYIFFC */
- #define SAMSUNG_KEYIFFC_MASK (0x3ff << 0)
- enum samsung_keypad_type {
- KEYPAD_TYPE_SAMSUNG,
- KEYPAD_TYPE_S5PV210,
- };
- struct samsung_keypad {
- struct input_dev *input_dev;
- struct clk *clk;
- void __iomem *base;
- wait_queue_head_t wait;
- bool stopped;
- int irq;
- unsigned int row_shift;
- unsigned int rows;
- unsigned int cols;
- unsigned int row_state[SAMSUNG_MAX_COLS];
- unsigned short keycodes[];
- };
- static int samsung_keypad_is_s5pv210(struct device *dev)
- {
- struct platform_device *pdev = to_platform_device(dev);
- enum samsung_keypad_type type =
- platform_get_device_id(pdev)->driver_data;
- return type == KEYPAD_TYPE_S5PV210;
- }
- static void samsung_keypad_scan(struct samsung_keypad *keypad,
- unsigned int *row_state)
- {
- // struct device *dev = keypad->input_dev->dev.parent;
- unsigned int col;
- unsigned int val;
- // printk("<0>samsung_keypad_scan!\n");
- for (col = 0; col < keypad->cols; col++) {
- /*if (samsung_keypad_is_s5pv210(dev)) {
- val = S5PV210_KEYIFCOLEN_MASK;
- val &= ~(1 << col) << 8;
- } else {*/
- val = SAMSUNG_KEYIFCOL_MASK;
- val &= ~(1 << col);
- //}
- writel(val, keypad->base + SAMSUNG_KEYIFCOL);
- mdelay(1);
- val = readl(keypad->base + SAMSUNG_KEYIFROW);
- row_state[col] = ~val & ((1 << keypad->rows) - 1);
- }
- /* KEYIFCOL reg clear */
- writel(0, keypad->base + SAMSUNG_KEYIFCOL);
- }
- static bool samsung_keypad_report(struct samsung_keypad *keypad,
- unsigned int *row_state)
- {
- struct input_dev *input_dev = keypad->input_dev;
- unsigned int changed;
- unsigned int pressed;
- unsigned int key_down = 0;
- unsigned int val;
- unsigned int col, row;
- for (col = 0; col < keypad->cols; col++) {
- changed = row_state[col] ^ keypad->row_state[col];
- key_down |= row_state[col];
- if (!changed)
- continue;
- for (row = 0; row < keypad->rows; row++) {
- if (!(changed & (1 << row)))
- continue;
- pressed = row_state[col] & (1 << row);
- printk("\n<0>samsung_keypad key %s,row:%d,col:%d\n"
- ,(pressed ? "pressed":"released"),row,col );
- dev_dbg(&keypad->input_dev->dev,
- "key %s, row: %d, col: %d\n",
- pressed ? "pressed" : "released", row, col);
- val = MATRIX_SCAN_CODE(row, col, keypad->row_shift);
- input_event(input_dev, EV_MSC, MSC_SCAN, val);
- input_report_key(input_dev,
- keypad->keycodes[val], pressed);
- }
- input_sync(keypad->input_dev);
- }
- memcpy(keypad->row_state, row_state, sizeof(keypad->row_state));
- return key_down;
- }
- static irqreturn_t samsung_keypad_irq(int irq, void *dev_id)
- {
- struct samsung_keypad *keypad = dev_id;
- unsigned int row_state[SAMSUNG_MAX_COLS];
- unsigned int val;
- bool key_down;
- do {
- val = readl(keypad->base + SAMSUNG_KEYIFSTSCLR);
- /* Clear interrupt. */
- writel(~0x0, keypad->base + SAMSUNG_KEYIFSTSCLR);
- samsung_keypad_scan(keypad, row_state);
- key_down = samsung_keypad_report(keypad, row_state);
- if (key_down)
- wait_event_timeout(keypad->wait, keypad->stopped,
- msecs_to_jiffies(50));
- } while (key_down && !keypad->stopped);
- return IRQ_HANDLED;
- }
- static void samsung_keypad_start(struct samsung_keypad *keypad)
- {
- unsigned int val;
- /* Tell IRQ thread that it may poll the device. */
- keypad->stopped = false;
- clk_enable(keypad->clk);
- /* Enable interrupt bits. */
- val = readl(keypad->base + SAMSUNG_KEYIFCON);
- val |= SAMSUNG_KEYIFCON_INT_F_EN | SAMSUNG_KEYIFCON_INT_R_EN;
- writel(val, keypad->base + SAMSUNG_KEYIFCON);
- /* KEYIFCOL reg clear. */
- writel(0, keypad->base + SAMSUNG_KEYIFCOL);
- }
- static void samsung_keypad_stop(struct samsung_keypad *keypad)
- {
- unsigned int val;
- /* Signal IRQ thread to stop polling and disable the handler. */
- keypad->stopped = true;
- wake_up(&keypad->wait);
- disable_irq(keypad->irq);
- /* Clear interrupt. */
- writel(~0x0, keypad->base + SAMSUNG_KEYIFSTSCLR);
- /* Disable interrupt bits. */
- val = readl(keypad->base + SAMSUNG_KEYIFCON);
- val &= ~(SAMSUNG_KEYIFCON_INT_F_EN | SAMSUNG_KEYIFCON_INT_R_EN);
- writel(val, keypad->base + SAMSUNG_KEYIFCON);
- clk_disable(keypad->clk);
- /*
- * Now that chip should not generate interrupts we can safely
- * re-enable the handler.
- */
- enable_irq(keypad->irq);
- }
- static int samsung_keypad_open(struct input_dev *input_dev)
- {
- printk("<0>samsung_keypad_open!\n");
- struct samsung_keypad *keypad = input_get_drvdata(input_dev);
- samsung_keypad_start(keypad);
- return 0;
- }
- static void samsung_keypad_close(struct input_dev *input_dev)
- {
- struct samsung_keypad *keypad = input_get_drvdata(input_dev);
- samsung_keypad_stop(keypad);
- }
- static int __devinit samsung_keypad_probe(struct platform_device *pdev)
- {
- const struct samsung_keypad_platdata *pdata;
- const struct matrix_keymap_data *keymap_data;
- struct samsung_keypad *keypad;
- struct resource *res;
- struct input_dev *input_dev;
- unsigned int row_shift;
- unsigned int keymap_size;
- int error;
- unsigned int key=0;
- unsigned int keycodes_size=sizeof(keypad_keycode)/sizeof(keypad_keycode[0]);
- printk("<0>samsung_keypad_probe!\n");
- pdata = pdev->dev.platform_data;
- if (!pdata) {
- dev_err(&pdev->dev, "no platform data defined\n");
- return -EINVAL;
- }
- keymap_data = pdata->keymap_data;
- if (!keymap_data) {
- dev_err(&pdev->dev, "no keymap data defined\n");
- return -EINVAL;
- }
- if (!pdata->rows || pdata->rows > SAMSUNG_MAX_ROWS)
- return -EINVAL;
- if (!pdata->cols || pdata->cols > SAMSUNG_MAX_COLS)
- return -EINVAL;
- /* initialize the gpio */
- if (pdata->cfg_gpio)
- pdata->cfg_gpio(pdata->rows, pdata->cols);
- row_shift = get_count_order(pdata->cols);
- keymap_size = (pdata->rows << row_shift) * sizeof(keypad->keycodes[0]);
- keypad = kzalloc(sizeof(*keypad) + keymap_size, GFP_KERNEL);
- input_dev = input_allocate_device();
- if (!keypad || !input_dev) {
- error = -ENOMEM;
- goto err_free_mem;
- }
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!res) {
- error = -ENODEV;
- goto err_free_mem;
- }
- keypad->base = ioremap(res->start, resource_size(res));
- if (!keypad->base) {
- error = -EBUSY;
- goto err_free_mem;
- }
- keypad->clk = clk_get(&pdev->dev, "keypad");
- if (IS_ERR(keypad->clk)) {
- dev_err(&pdev->dev, "failed to get keypad clk\n");
- error = PTR_ERR(keypad->clk);
- goto err_unmap_base;
- }
- keypad->input_dev = input_dev;
- keypad->row_shift = row_shift;
- keypad->rows = pdata->rows;
- keypad->cols = pdata->cols;
- init_waitqueue_head(&keypad->wait);
- input_dev->name = pdev->name;
- input_dev->id.bustype = BUS_HOST;
- input_dev->dev.parent = &pdev->dev;
- input_set_drvdata(input_dev, keypad);
- input_dev->open = samsung_keypad_open;
- input_dev->close = samsung_keypad_close;
- input_dev->evbit[0] = BIT_MASK(EV_KEY);
- if (!pdata->no_autorepeat)
- input_dev->evbit[0] |= BIT_MASK(EV_REP);
- input_set_capability(input_dev, EV_MSC, MSC_SCAN);
- input_dev->keycode = keypad->keycodes;
- input_dev->keycodesize = sizeof(keypad->keycodes[0]);
- input_dev->keycodemax = pdata->rows << row_shift;
- /*matrix_keypad_build_keymap(keymap_data, row_shift,
- input_dev->keycode, input_dev->keybit);*/
- for(key=0;key<keycodes_size;key++){
- int code=keypad->keycodes[key]=keypad_keycode[key];
- if(code<=0)
- continue;
- __set_bit(code,input_dev->keybit);
- }
- __clear_bit(0,input_dev->keybit);
- keypad->irq = platform_get_irq(pdev, 0);
- if (keypad->irq < 0) {
- error = keypad->irq;
- goto err_put_clk;
- }
- error = request_threaded_irq(keypad->irq, NULL, samsung_keypad_irq,
- IRQF_ONESHOT, dev_name(&pdev->dev), keypad);
- if (error) {
- dev_err(&pdev->dev, "failed to register keypad interrupt\n");
- goto err_put_clk;
- }
- error = input_register_device(keypad->input_dev);
- if (error)
- goto err_free_irq;
- device_init_wakeup(&pdev->dev, pdata->wakeup);
- platform_set_drvdata(pdev, keypad);
- return 0;
- err_free_irq:
- free_irq(keypad->irq, keypad);
- err_put_clk:
- clk_put(keypad->clk);
- err_unmap_base:
- iounmap(keypad->base);
- err_free_mem:
- input_free_device(input_dev);
- kfree(keypad);
- return error;
- }
- static int __devexit samsung_keypad_remove(struct platform_device *pdev)
- {
- struct samsung_keypad *keypad = platform_get_drvdata(pdev);
- device_init_wakeup(&pdev->dev, 0);
- platform_set_drvdata(pdev, NULL);
- input_unregister_device(keypad->input_dev);
- /*
- * It is safe to free IRQ after unregistering device because
- * samsung_keypad_close will shut off interrupts.
- */
- free_irq(keypad->irq, keypad);
- clk_put(keypad->clk);
- iounmap(keypad->base);
- kfree(keypad);
- return 0;
- }
- #ifdef CONFIG_PM
- static void samsung_keypad_toggle_wakeup(struct samsung_keypad *keypad,
- bool enable)
- {
- struct device *dev = keypad->input_dev->dev.parent;
- unsigned int val;
- clk_enable(keypad->clk);
- val = readl(keypad->base + SAMSUNG_KEYIFCON);
- if (enable) {
- val |= SAMSUNG_KEYIFCON_WAKEUPEN;
- if (device_may_wakeup(dev))
- enable_irq_wake(keypad->irq);
- } else {
- val &= ~SAMSUNG_KEYIFCON_WAKEUPEN;
- if (device_may_wakeup(dev))
- disable_irq_wake(keypad->irq);
- }
- writel(val, keypad->base + SAMSUNG_KEYIFCON);
- clk_disable(keypad->clk);
- }
- static int samsung_keypad_suspend(struct device *dev)
- {
- struct platform_device *pdev = to_platform_device(dev);
- struct samsung_keypad *keypad = platform_get_drvdata(pdev);
- struct input_dev *input_dev = keypad->input_dev;
- mutex_lock(&input_dev->mutex);
- if (input_dev->users)
- samsung_keypad_stop(keypad);
- samsung_keypad_toggle_wakeup(keypad, true);
- mutex_unlock(&input_dev->mutex);
- return 0;
- }
- static int samsung_keypad_resume(struct device *dev)
- {
- struct platform_device *pdev = to_platform_device(dev);
- struct samsung_keypad *keypad = platform_get_drvdata(pdev);
- struct input_dev *input_dev = keypad->input_dev;
- mutex_lock(&input_dev->mutex);
- samsung_keypad_toggle_wakeup(keypad, false);
- if (input_dev->users)
- samsung_keypad_start(keypad);
- mutex_unlock(&input_dev->mutex);
- return 0;
- }
- static const struct dev_pm_ops samsung_keypad_pm_ops = {
- .suspend = samsung_keypad_suspend,
- .resume = samsung_keypad_resume,
- };
- #endif
- static struct platform_device_id samsung_keypad_driver_ids[] = {
- {
- .name = "samsung-keypad",
- .driver_data = KEYPAD_TYPE_SAMSUNG,
- }, {
- .name = "s5pv210-keypad",
- .driver_data = KEYPAD_TYPE_S5PV210,
- },
- { },
- };
- MODULE_DEVICE_TABLE(platform, samsung_keypad_driver_ids);
- static struct platform_driver samsung_keypad_driver = {
- .probe = samsung_keypad_probe,
- .remove = __devexit_p(samsung_keypad_remove),
- .driver = {
- .name = "samsung-keypad",
- .owner = THIS_MODULE,
- #ifdef CONFIG_PM
- .pm = &samsung_keypad_pm_ops,
- #endif
- },
- .id_table = samsung_keypad_driver_ids,
- };
- static int __init samsung_keypad_init(void)
- {
- printk("<0>adc_drv_open and adc_init()\n");
- return platform_driver_register(&samsung_keypad_driver);
- }
- module_init(samsung_keypad_init);
- static void __exit samsung_keypad_exit(void)
- {
- platform_driver_unregister(&samsung_keypad_driver);
- }
- module_exit(samsung_keypad_exit);
- MODULE_DESCRIPTION("Samsung keypad driver");
- MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
- MODULE_AUTHOR("Donghwa Lee <dh09.lee@samsung.com>");
- MODULE_LICENSE("GPL");
- MODULE_ALIAS("platform:samsung-keypad");
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