[PATCH v2 5/5] input: samsung-keypad - Add samsung keypad driver
Joonyoung Shim
jy0922.shim at samsung.com
Sun May 30 00:35:58 EDT 2010
On 5/30/2010 12:42 PM, Ben Dooks wrote:
> On Sun, May 30, 2010 at 12:06:24PM +0900, Joonyoung Shim wrote:
>> This patch adds support for keypad driver running on Samsung cpus. This
>> driver is tested on GONI and Aquila board using S5PC110 cpu.
>>
>> Signed-off-by: Joonyoung Shim <jy0922.shim at samsung.com>
>> Signed-off-by: Kyungmin Park <kyungmin.park at samsung.com>
>> ---
>> drivers/input/keyboard/Kconfig | 9 +
>> drivers/input/keyboard/Makefile | 1 +
>> drivers/input/keyboard/samsung-keypad.c | 364 +++++++++++++++++++++++++++++++
>> 3 files changed, 374 insertions(+), 0 deletions(-)
>> create mode 100644 drivers/input/keyboard/samsung-keypad.c
>>
>> diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
>> index d8fa5d7..bf6a50f 100644
>> --- a/drivers/input/keyboard/Kconfig
>> +++ b/drivers/input/keyboard/Kconfig
>> @@ -342,6 +342,15 @@ config KEYBOARD_PXA930_ROTARY
>> To compile this driver as a module, choose M here: the
>> module will be called pxa930_rotary.
>>
>> +config KEYBOARD_SAMSUNG
>> + tristate "Samsung keypad support"
>> + depends on SAMSUNG_DEV_KEYPAD
>> + help
>> + Say Y here if you want to use the Samsung keypad.
>> +
>> + To compile this driver as a module, choose M here: the
>> + module will be called samsung-keypad.
>> +
>> config KEYBOARD_STOWAWAY
>> tristate "Stowaway keyboard"
>> select SERIO
>> diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile
>> index 4596d0c..8f973ed 100644
>> --- a/drivers/input/keyboard/Makefile
>> +++ b/drivers/input/keyboard/Makefile
>> @@ -32,6 +32,7 @@ obj-$(CONFIG_KEYBOARD_OPENCORES) += opencores-kbd.o
>> obj-$(CONFIG_KEYBOARD_PXA27x) += pxa27x_keypad.o
>> obj-$(CONFIG_KEYBOARD_PXA930_ROTARY) += pxa930_rotary.o
>> obj-$(CONFIG_KEYBOARD_QT2160) += qt2160.o
>> +obj-$(CONFIG_KEYBOARD_SAMSUNG) += samsung-keypad.o
>> obj-$(CONFIG_KEYBOARD_SH_KEYSC) += sh_keysc.o
>> obj-$(CONFIG_KEYBOARD_STOWAWAY) += stowaway.o
>> obj-$(CONFIG_KEYBOARD_SUNKBD) += sunkbd.o
>> diff --git a/drivers/input/keyboard/samsung-keypad.c b/drivers/input/keyboard/samsung-keypad.c
>> new file mode 100644
>> index 0000000..f4bcf97
>> --- /dev/null
>> +++ b/drivers/input/keyboard/samsung-keypad.c
>> @@ -0,0 +1,364 @@
>> +/*
>> + * samsung-keypad.c -- Samsung keypad driver
>> + *
>> + * Copyright (C) 2010 Samsung Electronics Co.Ltd
>> + * Author: Joonyoung Shim <jy0922.shim at samsung.com>
>> + * Author: Donghwa Lee <dh09.lee at 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 <plat/cpu.h>
>
> you should _not_ be including <plat/cpu.h> here. and it looks form
> the rest of the file that there's nothing from it being used.
>
Yes, i will remove it.
>> +#include <plat/keypad.h>
>> +#include <plat/regs-keypad.h>
>> +
>> +struct samsung_kp {
>> + struct input_dev *input_dev;
>> + struct timer_list timer;
>> + struct clk *clk;
>> + struct work_struct work;
>> + void __iomem *base;
>> + unsigned short *keycodes;
>> + unsigned int row_shift;
>> + unsigned int rows;
>> + unsigned int cols;
>> + unsigned int row_state[SAMSUNG_MAX_COLS];
>> + int irq;
>> +};
>> +
>> +static void samsung_kp_scan(struct samsung_kp *keypad, unsigned int *row_state)
>> +{
>> + unsigned int col;
>> + unsigned int val;
>> +
>> + for (col = 0; col < keypad->cols; col++) {
>> +#if CONFIG_ARCH_S5PV210
>> + val = S5PV210_KEYIFCOLEN_MASK;
>> + val &= ~(1 << col) << 8;
>> +#else
>> + val = SAMSUNG_KEYIFCOL_MASK;
>> + val &= ~(1 << col);
>> +#endif
>
> no platform specific #ifdefs
>
OK, i will find other ways.
>> + 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 void samsung_kp_worker(struct work_struct *work)
>> +{
>> + struct samsung_kp *keypad = container_of(work, struct samsung_kp, work);
>> + unsigned int row_state[SAMSUNG_MAX_COLS];
>> + unsigned int val;
>> + unsigned int changed;
>> + unsigned int pressed;
>> + unsigned int key_down = 0;
>> + int col, row;
>> +
>> + clk_enable(keypad->clk);
>> +
>> + val = readl(keypad->base + SAMSUNG_KEYIFSTSCLR);
>> +
>> + /* interrupt clear */
>> + writel(~0x0, keypad->base + SAMSUNG_KEYIFSTSCLR);
>> +
>> + val = readl(keypad->base + SAMSUNG_KEYIFCON);
>> + val &= ~(SAMSUNG_INT_F_EN | SAMSUNG_INT_R_EN);
>> + writel(val, keypad->base + SAMSUNG_KEYIFCON);
>> +
>> + samsung_kp_scan(keypad, row_state);
>> +
>> + 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);
>> +
>> + 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_report_key(keypad->input_dev,
>> + keypad->keycodes[val], pressed);
>> + input_sync(keypad->input_dev);
>> + }
>> + }
>> + memcpy(keypad->row_state, row_state, sizeof(row_state));
>> +
>> + if (key_down)
>> + mod_timer(&keypad->timer, jiffies + HZ / 20);
>> + else {
>> + /* enable interrupt bit */
>> + val = readl(keypad->base + SAMSUNG_KEYIFCON);
>> + val |= (SAMSUNG_INT_F_EN | SAMSUNG_INT_R_EN);
>> + writel(val, keypad->base + SAMSUNG_KEYIFCON);
>> + enable_irq(keypad->irq);
>> + }
>> + clk_disable(keypad->clk);
>> +}
>> +
>> +static irqreturn_t samsung_kp_interrupt(int irq, void *dev_id)
>> +{
>> + struct samsung_kp *keypad = dev_id;
>> +
>> + if (!work_pending(&keypad->work)) {
>> + disable_irq_nosync(keypad->irq);
>> + schedule_work(&keypad->work);
>> + }
>> +
>> + return IRQ_HANDLED;
>> +}
>> +
>> +static void samsung_kp_timer(unsigned long data)
>> +{
>> + struct samsung_kp *keypad = (struct samsung_kp *)data;
>> +
>> + schedule_work(&keypad->work);
>> +}
>> +
>> +static int __devinit samsung_kp_probe(struct platform_device *pdev)
>> +{
>> + const struct samsung_kp_platdata *pdata;
>> + const struct matrix_keymap_data *keymap_data;
>> + struct samsung_kp *keypad;
>> + struct resource *res;
>> + struct input_dev *input_dev;
>> + unsigned short *keycodes;
>> + unsigned int row_shift;
>> + unsigned int val;
>> + int ret;
>> +
>> + 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 <= 0) || (pdata->rows > SAMSUNG_MAX_ROWS))
>> + return -EINVAL;
>
>
> how about making pdata->rows unsigned then if -ve values are illegal
>
Ah, pdata->rows is unsigned. This is unnecessary checking.
>> + if ((pdata->cols <= 0) || (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);
>> + keypad = kzalloc(sizeof(*keypad), GFP_KERNEL);
>> + keycodes = kzalloc((pdata->rows << row_shift) * sizeof(*keycodes),
>> + GFP_KERNEL);
>
> you could allocate this in one go.
>
Hmm, how i do it? Do you mean to allocate keypad and keycodes together?
>> + input_dev = input_allocate_device();
>> + if (!keypad || !keycodes || !input_dev) {
>> + ret = -ENOMEM;
>> + goto err_free_mem;
>> + }
>> +
>> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> + if (!res) {
>> + ret = -ENODEV;
>> + goto err_free_mem;
>> + }
>> +
>> + keypad->base = ioremap(res->start, resource_size(res));
>> + if (!keypad->base) {
>> + ret = -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");
>> + ret = PTR_ERR(keypad->clk);
>> + goto err_unmap_base;
>> + }
>> + clk_enable(keypad->clk);
>> +
>> + keypad->input_dev = input_dev;
>> + keypad->keycodes = keycodes;
>> + keypad->row_shift = row_shift;
>> + keypad->rows = pdata->rows;
>> + keypad->cols = pdata->cols;
>> +
>> + INIT_WORK(&keypad->work, samsung_kp_worker);
>> +
>> + setup_timer(&keypad->timer, samsung_kp_timer, (unsigned long)keypad);
>> +
>> + /* enable interrupt and wakeup bit */
>> + val = SAMSUNG_INT_F_EN | SAMSUNG_INT_R_EN | SAMSUNG_WAKEUPEN;
>> + writel(val, keypad->base + SAMSUNG_KEYIFCON);
>> +
>> + /* KEYIFCOL reg clear */
>> + writel(0, keypad->base + SAMSUNG_KEYIFCOL);
>> +
>> + keypad->irq = platform_get_irq(pdev, 0);
>> + if (keypad->irq < 0) {
>> + ret = keypad->irq;
>> + goto err_disable_clk;
>> + }
>> +
>> + ret = request_irq(keypad->irq, samsung_kp_interrupt, 0,
>> + dev_name(&pdev->dev), keypad);
>> +
>> + if (ret)
>> + goto err_disable_clk;
>> +
>> + input_dev->name = pdev->name;
>> + input_dev->id.bustype = BUS_HOST;
>> + input_dev->dev.parent = &pdev->dev;
>> +
>> + input_dev->evbit[0] = BIT_MASK(EV_KEY);
>> + if (pdata->rep)
>> + input_dev->evbit[0] |= BIT_MASK(EV_REP);
>> +
>> + input_dev->keycode = keycodes;
>> + input_dev->keycodesize = sizeof(*keycodes);
>> + input_dev->keycodemax = pdata->rows << row_shift;
>> +
>> + matrix_keypad_build_keymap(keymap_data, row_shift,
>> + input_dev->keycode, input_dev->keybit);
>> +
>> + ret = input_register_device(keypad->input_dev);
>> + if (ret)
>> + goto err_free_irq;
>> +
>> + platform_set_drvdata(pdev, keypad);
>> + clk_disable(keypad->clk);
>> +
>> + return 0;
>> +
>> +err_free_irq:
>> + free_irq(keypad->irq, keypad);
>> +err_disable_clk:
>> + clk_disable(keypad->clk);
>> + clk_put(keypad->clk);
>> +err_unmap_base:
>> + iounmap(keypad->base);
>> +err_free_mem:
>> + input_free_device(input_dev);
>> + kfree(keycodes);
>> + kfree(keypad);
>> +
>> + return ret;
>> +}
>> +
>> +static int __devexit samsung_kp_remove(struct platform_device *pdev)
>> +{
>> + struct samsung_kp *keypad = platform_get_drvdata(pdev);
>> +
>> + free_irq(keypad->irq, keypad);
>> + cancel_work_sync(&keypad->work);
>> + del_timer_sync(&keypad->timer);
>> +
>> + platform_set_drvdata(pdev, NULL);
>> + input_unregister_device(keypad->input_dev);
>> +
>> + clk_disable(keypad->clk);
>> + clk_put(keypad->clk);
>> +
>> + iounmap(keypad->base);
>> + kfree(keypad->keycodes);
>> + kfree(keypad);
>> +
>> + return 0;
>> +}
>> +
>> +#ifdef CONFIG_PM
>> +static int samsung_kp_suspend(struct device *dev)
>> +{
>> + struct platform_device *pdev = to_platform_device(dev);
>> + struct samsung_kp *keypad = platform_get_drvdata(pdev);
>> +
>> + disable_irq(keypad->irq);
>> +
>> + return 0;
>> +}
>> +
>> +static int samsung_kp_resume(struct device pdev)
>> +{
>> + struct platform_device *pdev = to_platform_device(dev);
>> + struct samsung_kp *keypad = platform_get_drvdata(pdev);
>> + unsigned int val;
>> +
>> + clk_enable(keypad->clk);
>> +
>> + /* enable interrupt and wakeup bit */
>> + val = SAMSUNG_INT_F_EN | SAMSUNG_INT_R_EN | SAMSUNG_WAKEUPEN;
>> + writel(val, keypad->base + SAMSUNG_KEYIFCON);
>> +
>> + /* KEYIFCOL reg clear */
>> + writel(0, keypad->base + SAMSUNG_KEYIFCOL);
>> +
>> + enable_irq(keypad->irq);
>> + clk_disable(keypad->clk);
>> +
>> + return 0;
>> +}
>> +
>> +static const struct dev_pm_ops samsung_kp_pm_ops = {
>> + .suspend = samsung_kp_suspend,
>> + .resume = samsung_kp_resume,
>> +};
>> +#endif
>> +
>> +static struct platform_driver samsung_kp_driver = {
>> + .probe = samsung_kp_probe,
>> + .remove = __devexit_p(samsung_kp_remove),
>> + .driver = {
>> + .name = "samsung-keypad",
>> + .owner = THIS_MODULE,
>> +#ifdef CONFIG_PM
>> + .pm = &samsung_kp_pm_ops,
>> +#endif
>> + },
>> +};
>> +
>> +static int __init samsung_kp_init(void)
>> +{
>> + return platform_driver_register(&samsung_kp_driver);
>> +}
>> +
>> +static void __exit samsung_kp_exit(void)
>> +{
>> + platform_driver_unregister(&samsung_kp_driver);
>> +}
>> +
>> +module_init(samsung_kp_init);
>> +module_exit(samsung_kp_exit);
>> +
>> +MODULE_DESCRIPTION("Samsung keypad driver");
>> +MODULE_AUTHOR("Joonyoung Shim <jy0922.shim at samsung.com>");
>> +MODULE_AUTHOR("Donghwa Lee <dh09.lee at samsung.com>");
>> +MODULE_LICENSE("GPL");
>> --
>> 1.7.0.4
>>
>>
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