This keypad driver supports Samsung s3c based SoCs such as s3c6410.
This driver is written with input device compatibles.
Signed-off-by: Jinsung Yang <jsgood.yang@xxxxxxxxxxx>
Signed-off-by: Kyeongil Kim <ki0351.kim@xxxxxxxxxxx>
---
drivers/input/keyboard/s3c-keypad.c | 468 +++++++++++++++++++++++++++++++++++
1 files changed, 468 insertions(+), 0 deletions(-)
create mode 100644 drivers/input/keyboard/s3c-keypad.c
diff --git a/drivers/input/keyboard/s3c-keypad.c b/drivers/input/keyboard/s3c-keypad.c
new file mode 100644
index 0000000..73b9a90
--- /dev/null
+++ b/drivers/input/keyboard/s3c-keypad.c
@@ -0,0 +1,468 @@
+/*
+ * linux/drivers/input/keyboard/s3c_keypad.c
+ *
+ * Driver for Samsung SoC matrix keypad controller.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/input.h>
+#include <linux/platform_device.h>
+#include <linux/miscdevice.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+
+#include <mach/hardware.h>
+#include <asm/irq.h>
+
+#include <plat/keypad.h>
+#include <plat/regs-keypad.h>
+
+#undef DEBUG
+
+static const unsigned char s3c_keycode[] = {
+ 1, 2, KEY_1, KEY_Q, KEY_A, 6, 7, KEY_LEFT,
+ 9, 10, KEY_2, KEY_W, KEY_S, KEY_Z, KEY_RIGHT, 16,
+ 17, 18, KEY_3, KEY_E, KEY_D, KEY_X, 23, KEY_UP,
+ 25, 26, KEY_4, KEY_R, KEY_F, KEY_C, 31, 32,
+ 33, KEY_O, KEY_5, KEY_T, KEY_G, KEY_V, KEY_DOWN, KEY_BACKSPACE,
+ KEY_P, KEY_0, KEY_6, KEY_Y, KEY_H, KEY_SPACE, 47, 48,
+ KEY_M, KEY_L, KEY_7, KEY_U, KEY_J, KEY_N, 55, KEY_ENTER,
+ KEY_LEFTSHIFT, KEY_9, KEY_8, KEY_I, KEY_K, KEY_B, 63, KEY_COMMA,
+};
+
+struct s3c_keypad {
+ struct s3c_platform_keypad *pdata;
+ unsigned char keycodes[ARRAY_SIZE(s3c_keycode)];
+ struct input_dev *dev;
+ struct timer_list timer;
+ void __iomem *regs;
+ struct clk *clk;
+ int irq;
+ int timer_enabled;
+ unsigned int prevmask_low;
+ unsigned int prevmask_high;
+ unsigned int keyifcon;
+ unsigned int keyiffc;
+};
+
+static int s3c_keypad_scan(struct s3c_keypad *keypad, u32 *keymask_low,
+ u32 *keymask_high)
+{
+ struct s3c_platform_keypad *pdata = keypad->pdata;
+ int i, j = 0;
+ u32 cval, rval, cfg;
+
+ for (i = 0; i < pdata->nr_cols; i++) {
+ cval = readl(keypad->regs + S3C_KEYIFCOL);
+ cval |= S3C_KEYIF_COL_DMASK;
+ cval &= ~(1 << i);
+ writel(cval, keypad->regs + S3C_KEYIFCOL);
+ udelay(pdata->delay);
+
+ rval = ~(readl(keypad->regs + S3C_KEYIFROW)) &
+ S3C_KEYIF_ROW_DMASK;
+
+ if ((i * pdata->nr_rows) < pdata->max_masks)
+ *keymask_low |= (rval << (i * pdata->nr_rows));
+ else {
+ *keymask_high |= (rval << (j * pdata->nr_rows));
+ j++;
+ }
+ }
+
+ cfg = readl(keypad->regs + S3C_KEYIFCOL);
+ cfg &= ~S3C_KEYIF_COL_MASK_ALL;
+ writel(cfg, keypad->regs + S3C_KEYIFCOL);
+
+ return 0;
+}
+
+static void s3c_keypad_timer_handler(unsigned long data)
+{
+ struct s3c_keypad *keypad = (struct s3c_keypad *)data;
+ struct s3c_platform_keypad *pdata = keypad->pdata;
+ struct input_dev *input = keypad->dev;
+ u32 keymask_low = 0, keymask_high = 0;
+ u32 press_mask_low, press_mask_high;
+ u32 release_mask_low, release_mask_high, code, cfg;
+ int i;
+
+ s3c_keypad_scan(keypad, &keymask_low, &keymask_high);
+
+ if (keymask_low != keypad->prevmask_low) {
+ press_mask_low = ((keymask_low ^ keypad->prevmask_low) &
+ keymask_low);
+ release_mask_low = ((keymask_low ^ keypad->prevmask_low) &
+ keypad->prevmask_low);
+
+ i = 0;
+ while (press_mask_low) {
+ if (press_mask_low & 1) {
+ code = keypad->keycodes[i];
+ input_report_key(input, code, 1);
+ dev_dbg(&input->dev, "low pressed: %d\n", i);
+ }
+ press_mask_low >>= 1;
+ i++;
+ }
+
+ i = 0;
+ while (release_mask_low) {
+ if (release_mask_low & 1) {
+ code = keypad->keycodes[i];
+ input_report_key(input, code, 0);
+ dev_dbg(&input->dev, "low released : %d\n", i);
+ }
+ release_mask_low >>= 1;
+ i++;
+ }
+ keypad->prevmask_low = keymask_low;
+ }
+
+ if (keymask_high != keypad->prevmask_high) {
+ press_mask_high = ((keymask_high ^ keypad->prevmask_high) &
+ keymask_high);
+ release_mask_high = ((keymask_high ^ keypad->prevmask_high) &
+ keypad->prevmask_high);
+
+ i = 0;
+ while (press_mask_high) {
+ if (press_mask_high & 1) {
+ code = keypad->keycodes[i + pdata->max_masks];
+ input_report_key(input, code, 1);
+ dev_dbg(&input->dev, "high pressed: %d %d\n",
+ keypad->keycodes[i + pdata->max_masks],
+ i);
+ }
+ press_mask_high >>= 1;
+ i++;
+ }
+
+ i = 0;
+ while (release_mask_high) {
+ if (release_mask_high & 1) {
+ code = keypad->keycodes[i + pdata->max_masks];
+ input_report_key(input, code, 0);
+ dev_dbg(&input->dev, "high released: %d\n",
+ keypad->keycodes[i + pdata->max_masks]);
+ }
+ release_mask_high >>= 1;
+ i++;
+ }
+ keypad->prevmask_high = keymask_high;
+ }
+
+ if (keymask_low | keymask_high) {
+ mod_timer(&keypad->timer, jiffies + HZ / 10);
+ } else {
+ cfg = readl(keypad->regs + S3C_KEYIFCON);
+ cfg &= ~S3C_KEYIF_CON_MASK_ALL;
+ cfg |= (S3C_KEYIF_INT_F_EN | S3C_KEYIF_INT_R_EN |
+ S3C_KEYIF_DF_EN | S3C_KEYIF_FC_EN);
+ writel(cfg, keypad->regs + S3C_KEYIFCON);
+
+ keypad->timer_enabled = 0;
+ }
+}
+
+static irqreturn_t s3c_keypad_irq(int irq, void *dev_id)
+{
+ struct s3c_keypad *keypad = dev_id;
+ u32 cfg;
+
+ /* disable keypad interrupt and schedule for keypad timer handler */
+ cfg = readl(keypad->regs + S3C_KEYIFCON);
+ cfg &= ~(S3C_KEYIF_INT_F_EN | S3C_KEYIF_INT_R_EN);
+ writel(cfg, keypad->regs + S3C_KEYIFCON);
+
+ keypad->timer.expires = jiffies + (HZ / 100);
+ if (keypad->timer_enabled) {
+ mod_timer(&keypad->timer, keypad->timer.expires);
+ } else {
+ add_timer(&keypad->timer);
+ keypad->timer_enabled = 1;
+ }
+
+ /* clear the keypad interrupt status */
+ writel(S3C_KEYIF_STSCLR_CLEAR, keypad->regs + S3C_KEYIFSTSCLR);
+
+ return IRQ_HANDLED;
+}
+
+static int s3c_keypad_open(struct input_dev *dev)
+{
+ struct s3c_keypad *keypad = input_get_drvdata(dev);
+ u32 cfg;
+
+ clk_enable(keypad->clk);
+
+ /* init keypad h/w block */
+ cfg = readl(keypad->regs + S3C_KEYIFCON);
+ cfg &= ~S3C_KEYIF_CON_MASK_ALL;
+ cfg |= (S3C_KEYIF_INT_F_EN | S3C_KEYIF_INT_R_EN |
+ S3C_KEYIF_DF_EN | S3C_KEYIF_FC_EN);
+ writel(cfg, keypad->regs + S3C_KEYIFCON);
+
+ cfg = readl(keypad->regs + S3C_KEYIFFC);
+ cfg |= 0x1;
+ writel(cfg, keypad->regs + S3C_KEYIFFC);
+
+ cfg = readl(keypad->regs + S3C_KEYIFCOL);
+ cfg &= ~S3C_KEYIF_COL_MASK_ALL;
+ writel(cfg, keypad->regs + S3C_KEYIFCOL);
+
+ /* Scan timer init */
+ init_timer(&keypad->timer);
+ keypad->timer.function = s3c_keypad_timer_handler;
+ keypad->timer.data = (unsigned long)keypad;
+ keypad->timer.expires = jiffies + (HZ / 10);
+
+ if (keypad->timer_enabled) {
+ mod_timer(&keypad->timer, keypad->timer.expires);
+ } else {
+ add_timer(&keypad->timer);
+ keypad->timer_enabled = 1;
+ }
+
+ return 0;
+}
+
+static void s3c_keypad_close(struct input_dev *dev)
+{
+ struct s3c_keypad *keypad = input_get_drvdata(dev);
+
+ clk_disable(keypad->clk);
+}
+
+#define res_size(res) ((res)->end - (res)->start + 1)
+
+static int __devinit s3c_keypad_probe(struct platform_device *pdev)
+{
+ struct s3c_platform_keypad *pdata;
+ struct s3c_keypad *keypad;
+ struct input_dev *input;
+ struct resource *res;
+ int irq, error, i;
+
+ pdata = pdev->dev.platform_data;
+ if (pdata == NULL) {
+ dev_err(&pdev->dev, "no platform data\n");
+ return -EINVAL;
+ }
+
+ keypad = kzalloc(sizeof(struct s3c_keypad), GFP_KERNEL);
+ if (keypad == NULL) {
+ dev_err(&pdev->dev, "failed to allocate driver data\n");
+ return -ENOMEM;
+ }
+
+ keypad->pdata = pdata;
+ memcpy(keypad->keycodes, s3c_keycode, sizeof(keypad->keycodes));
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (res == NULL) {
+ dev_err(&pdev->dev, "failed to get I/O memory\n");
+ error = -ENXIO;
+ goto err_get_io;
+ }
+
+ res = request_mem_region(res->start, res_size(res), pdev->name);
+ if (res == NULL) {
+ dev_err(&pdev->dev, "failed to request I/O memory\n");
+ error = -EBUSY;
+ goto err_get_io;
+ }
+
+ keypad->regs = ioremap(res->start, res_size(res));
+ if (keypad->regs == NULL) {
+ dev_err(&pdev->dev, "failed to remap I/O memory\n");
+ error = -ENXIO;
+ goto err_map_io;
+ }
+
+ keypad->clk = clk_get(&pdev->dev, "keypad");
+ if (IS_ERR(keypad->clk)) {
+ dev_err(&pdev->dev, "failed to get keypad clock\n");
+ error = PTR_ERR(keypad->clk);
+ goto err_clk;
+ }
+
+ /* Create and register the input driver. */
+ input = input_allocate_device();
+ if (!input) {
+ dev_err(&pdev->dev, "failed to allocate input device\n");
+ error = -ENOMEM;
+ goto err_alloc_input;
+ }
+
+ input->name = pdev->name;
+ input->id.bustype = BUS_HOST;
+ input->open = s3c_keypad_open;
+ input->close = s3c_keypad_close;
+ input->dev.parent = &pdev->dev;
+ input->keycode = (void *)keypad->keycodes;
+ input->keycodesize = sizeof(keypad->keycodes[0]);
+ input->keycodemax = ARRAY_SIZE(keypad->keycodes);
+
+ keypad->dev = input;
+
+ input_set_drvdata(input, keypad);
+
+ __set_bit(EV_KEY, input->evbit);
+ __set_bit(EV_REP, input->evbit);
+
+ for (i = 0; i < pdata->max_keys; i++) {
+ keypad->keycodes[i] = s3c_keycode[i];
+ if (keypad->keycodes[i] <= 0)
+ continue;
+
+ __set_bit(keypad->keycodes[i] & KEY_MAX, input->keybit);
+ }
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
+ dev_err(&pdev->dev, "failed to get keypad irq\n");
+ error = -ENXIO;
+ goto err_get_irq;
+ }
+
+ platform_set_drvdata(pdev, keypad);
+
+ error = request_irq(irq, s3c_keypad_irq, IRQF_DISABLED,
+ pdev->name, keypad);
+ if (error) {
+ dev_err(&pdev->dev, "failed to request IRQ\n");
+ goto err_req_irq;
+ }
+
+ keypad->irq = irq;
+
+ /* Register the input device */
+ error = input_register_device(input);
+ if (error) {
+ dev_err(&pdev->dev, "failed to register input device\n");
+ goto err_reg_input;
+ }
+
+ device_init_wakeup(&pdev->dev, 1);
+ dev_info(&pdev->dev, "Samsung Keypad Interface driver\n");
+
+ return 0;
+
+err_reg_input:
+ free_irq(irq, pdev);
+
+err_req_irq:
+ platform_set_drvdata(pdev, NULL);
+
+err_get_irq:
+ input_free_device(input);
+
+err_alloc_input:
+ clk_put(keypad->clk);
+
+err_clk:
+ iounmap(keypad->regs);
+
+err_map_io:
+ release_mem_region(res->start, res_size(res));
+
+err_get_io:
+ kfree(keypad);
+
+ return error;
+}
+
+static int __devexit s3c_keypad_remove(struct platform_device *pdev)
+{
+ struct s3c_keypad *keypad = platform_get_drvdata(pdev);
+ struct resource *res;
+
+ free_irq(keypad->irq, pdev);
+
+ clk_disable(keypad->clk);
+ clk_put(keypad->clk);
+
+ input_unregister_device(keypad->dev);
+ input_free_device(keypad->dev);
+
+ iounmap(keypad->regs);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ release_mem_region(res->start, res_size(res));
+
+ platform_set_drvdata(pdev, NULL);
+ kfree(keypad);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int s3c_keypad_suspend(struct platform_device *dev, pm_message_t state)
+{
+ struct s3c_keypad *keypad = platform_get_drvdata(pdev);
+
+ keypad->keyifcon = readl(keypad->regs + S3C_KEYIFCON);
+ keypad->keyiffc = readl(keypad->regs + S3C_KEYIFFC);
+
+ disable_irq(IRQ_KEYPAD);
+ clk_disable(keypad->clk);
+
+ return 0;
+}
+
+static int s3c_keypad_resume(struct platform_device *dev)
+{
+ struct s3c_keypad *keypad = platform_get_drvdata(pdev);
+
+ clk_enable(keypad->clock);
+
+ writel(keypad->keyifcon, keypad->regs + S3C_KEYIFCON);
+ writel(keypad->keyiffc, keypad->regs + S3C_KEYIFFC);
+
+ enable_irq(IRQ_KEYPAD);
+
+ return 0;
+}
+#else
+#define s3c_keypad_suspend NULL
+#define s3c_keypad_resume NULL
+#endif /* CONFIG_PM */
+
+static struct platform_driver s3c_keypad_driver = {
+ .probe = s3c_keypad_probe,
+ .remove = s3c_keypad_remove,
+ .suspend = s3c_keypad_suspend,
+ .resume = s3c_keypad_resume,
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "s3c-keypad",
+ },
+};
+
+static int __init s3c_keypad_init(void)
+{
+ return platform_driver_register(&s3c_keypad_driver);
+}
+
+static void __exit s3c_keypad_exit(void)
+{
+ platform_driver_unregister(&s3c_keypad_driver);
+}
+
+module_init(s3c_keypad_init);
+module_exit(s3c_keypad_exit);
+
+MODULE_AUTHOR("Kyeongil, Kim <ki0351.kim@xxxxxxxxxxx>");
+MODULE_AUTHOR("Jinsung, Yang <jsgood.yang@xxxxxxxxxxx>");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Keypad interface for Samsung SoC");
+
--
1.6.2.5
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