[PATCH v6 3/3] input: samsung-keypad - Add samsung keypad driver
Joonyoung Shim
jy0922.shim at samsung.com
Mon Jun 28 07:33:44 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 | 491 +++++++++++++++++++++++++++++++
3 files changed, 501 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..e467195
--- /dev/null
+++ b/drivers/input/keyboard/samsung-keypad.c
@@ -0,0 +1,491 @@
+/*
+ * 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/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)
+
+/* 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;
+
+ 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);
+
+ 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(row_state) * SAMSUNG_MAX_COLS);
+
+ 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)
+{
+ 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;
+
+ 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);
+
+ 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)
+{
+ 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 at samsung.com>");
+MODULE_AUTHOR("Donghwa Lee <dh09.lee at samsung.com>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:samsung-keypad");
--
1.7.0.4
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