[PATCH 5/5] input: samsung-keypad - Add samsung keypad driver
Joonyoung Shim
jy0922.shim at samsung.com
Sat May 29 21:58:51 EDT 2010
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..fe8fc7d
--- /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>
+#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
+ 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;
+
+ 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);
+ 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 *dev)
+{
+ 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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