Input: add keypad driver for w90p910
Add keypad driver for the 4x4 keypad on an evaluation board based
on w90p910.
Signed-off-by: Wan ZongShun <mcuos.com@gmail.com>
Reviewed-by: Trilok Soni <soni.trilok@gmail.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
diff --git a/drivers/input/keyboard/w90p910_keypad.c b/drivers/input/keyboard/w90p910_keypad.c
new file mode 100644
index 0000000..472c705
--- /dev/null
+++ b/drivers/input/keyboard/w90p910_keypad.c
@@ -0,0 +1,305 @@
+/*
+ * Copyright (c) 2008-2009 Nuvoton technology corporation.
+ *
+ * Wan ZongShun <mcuos.com@gmail.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;version 2 of the License.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/input.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/io.h>
+
+#include <mach/w90p910_keypad.h>
+
+/* Keypad Interface Control Registers */
+#define KPI_CONF 0x00
+#define KPI_3KCONF 0x04
+#define KPI_LPCONF 0x08
+#define KPI_STATUS 0x0C
+
+#define IS1KEY (0x01 << 16)
+#define INTTR (0x01 << 21)
+#define KEY0R (0x0f << 3)
+#define KEY0C 0x07
+#define DEBOUNCE_BIT 0x08
+#define KSIZE0 (0x01 << 16)
+#define KSIZE1 (0x01 << 17)
+#define KPSEL (0x01 << 19)
+#define ENKP (0x01 << 18)
+
+#define KGET_RAW(n) (((n) & KEY0R) >> 3)
+#define KGET_COLUMN(n) ((n) & KEY0C)
+
+#define MAX_MATRIX_KEY_NUM (8 * 8)
+
+struct w90p910_keypad {
+ struct w90p910_keypad_platform_data *pdata;
+ struct clk *clk;
+ struct input_dev *input_dev;
+ void __iomem *mmio_base;
+ int irq;
+ unsigned int matrix_keycodes[MAX_MATRIX_KEY_NUM];
+};
+
+static void w90p910_keypad_build_keycode(struct w90p910_keypad *keypad)
+{
+ struct w90p910_keypad_platform_data *pdata = keypad->pdata;
+ struct input_dev *input_dev = keypad->input_dev;
+ unsigned int *key;
+ int i;
+
+ key = &pdata->matrix_key_map[0];
+ for (i = 0; i < pdata->matrix_key_map_size; i++, key++) {
+ int row = KEY_ROW(*key);
+ int col = KEY_COL(*key);
+ int code = KEY_VAL(*key);
+
+ keypad->matrix_keycodes[(row << 3) + col] = code;
+ __set_bit(code, input_dev->keybit);
+ }
+}
+
+static inline unsigned int lookup_matrix_keycode(
+ struct w90p910_keypad *keypad, int row, int col)
+{
+ return keypad->matrix_keycodes[(row << 3) + col];
+}
+
+static void w90p910_keypad_scan_matrix(struct w90p910_keypad *keypad,
+ unsigned int status)
+{
+ unsigned int row, col, val;
+
+ row = KGET_RAW(status);
+ col = KGET_COLUMN(status);
+
+ val = lookup_matrix_keycode(keypad, row, col);
+
+ input_report_key(keypad->input_dev, val, 1);
+
+ input_sync(keypad->input_dev);
+
+ input_report_key(keypad->input_dev, val, 0);
+
+ input_sync(keypad->input_dev);
+}
+
+static irqreturn_t w90p910_keypad_irq_handler(int irq, void *dev_id)
+{
+ struct w90p910_keypad *keypad = dev_id;
+ unsigned int kstatus, val;
+
+ kstatus = __raw_readl(keypad->mmio_base + KPI_STATUS);
+
+ val = INTTR | IS1KEY;
+
+ if (kstatus & val)
+ w90p910_keypad_scan_matrix(keypad, kstatus);
+
+ return IRQ_HANDLED;
+}
+
+static int w90p910_keypad_open(struct input_dev *dev)
+{
+ struct w90p910_keypad *keypad = input_get_drvdata(dev);
+ struct w90p910_keypad_platform_data *pdata = keypad->pdata;
+ unsigned int val, config;
+
+ /* Enable unit clock */
+ clk_enable(keypad->clk);
+
+ val = __raw_readl(keypad->mmio_base + KPI_CONF);
+ val |= (KPSEL | ENKP);
+ val &= ~(KSIZE0 | KSIZE1);
+
+ config = pdata->prescale | (pdata->debounce << DEBOUNCE_BIT);
+
+ val |= config;
+
+ __raw_writel(val, keypad->mmio_base + KPI_CONF);
+
+ return 0;
+}
+
+static void w90p910_keypad_close(struct input_dev *dev)
+{
+ struct w90p910_keypad *keypad = input_get_drvdata(dev);
+
+ /* Disable clock unit */
+ clk_disable(keypad->clk);
+}
+
+static int __devinit w90p910_keypad_probe(struct platform_device *pdev)
+{
+ struct w90p910_keypad *keypad;
+ struct input_dev *input_dev;
+ struct resource *res;
+ int irq, error;
+
+ keypad = kzalloc(sizeof(struct w90p910_keypad), GFP_KERNEL);
+ if (keypad == NULL) {
+ dev_err(&pdev->dev, "failed to allocate driver data\n");
+ return -ENOMEM;
+ }
+
+ keypad->pdata = pdev->dev.platform_data;
+ if (keypad->pdata == NULL) {
+ dev_err(&pdev->dev, "no platform data defined\n");
+ error = -EINVAL;
+ goto failed_free;
+ }
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
+ dev_err(&pdev->dev, "failed to get keypad irq\n");
+ error = -ENXIO;
+ goto failed_free;
+ }
+
+ 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 failed_free;
+ }
+
+ res = request_mem_region(res->start, resource_size(res), pdev->name);
+ if (res == NULL) {
+ dev_err(&pdev->dev, "failed to request I/O memory\n");
+ error = -EBUSY;
+ goto failed_free;
+ }
+
+ keypad->mmio_base = ioremap(res->start, resource_size(res));
+ if (keypad->mmio_base == NULL) {
+ dev_err(&pdev->dev, "failed to remap I/O memory\n");
+ error = -ENXIO;
+ goto failed_free_mem;
+ }
+
+ keypad->clk = clk_get(&pdev->dev, NULL);
+ if (IS_ERR(keypad->clk)) {
+ dev_err(&pdev->dev, "failed to get keypad clock\n");
+ error = PTR_ERR(keypad->clk);
+ goto failed_free_io;
+ }
+
+ /* Create and register the input driver. */
+ input_dev = input_allocate_device();
+ if (!input_dev) {
+ dev_err(&pdev->dev, "failed to allocate input device\n");
+ error = -ENOMEM;
+ goto failed_put_clk;
+ }
+
+ /* set multi-function pin for w90p910 kpi. */
+ mfp_set_groupi(&pdev->dev);
+
+ input_dev->name = pdev->name;
+ input_dev->id.bustype = BUS_HOST;
+ input_dev->open = w90p910_keypad_open;
+ input_dev->close = w90p910_keypad_close;
+ input_dev->dev.parent = &pdev->dev;
+ input_dev->keycode = keypad->matrix_keycodes;
+ input_dev->keycodesize = sizeof(keypad->matrix_keycodes[0]);
+ input_dev->keycodemax = ARRAY_SIZE(keypad->matrix_keycodes);
+
+ keypad->input_dev = input_dev;
+ input_set_drvdata(input_dev, keypad);
+
+ input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
+ w90p910_keypad_build_keycode(keypad);
+ platform_set_drvdata(pdev, keypad);
+
+ error = request_irq(irq, w90p910_keypad_irq_handler, IRQF_DISABLED,
+ pdev->name, keypad);
+ if (error) {
+ dev_err(&pdev->dev, "failed to request IRQ\n");
+ goto failed_free_dev;
+ }
+
+ keypad->irq = irq;
+
+ /* Register the input device */
+ error = input_register_device(input_dev);
+ if (error) {
+ dev_err(&pdev->dev, "failed to register input device\n");
+ goto failed_free_irq;
+ }
+
+ return 0;
+
+failed_free_irq:
+ free_irq(irq, pdev);
+ platform_set_drvdata(pdev, NULL);
+failed_free_dev:
+ input_free_device(input_dev);
+failed_put_clk:
+ clk_put(keypad->clk);
+failed_free_io:
+ iounmap(keypad->mmio_base);
+failed_free_mem:
+ release_mem_region(res->start, resource_size(res));
+failed_free:
+ kfree(keypad);
+ return error;
+}
+
+static int __devexit w90p910_keypad_remove(struct platform_device *pdev)
+{
+ struct w90p910_keypad *keypad = platform_get_drvdata(pdev);
+ struct resource *res;
+
+ free_irq(keypad->irq, pdev);
+
+ clk_put(keypad->clk);
+
+ input_unregister_device(keypad->input_dev);
+
+ iounmap(keypad->mmio_base);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ release_mem_region(res->start, resource_size(res));
+
+ platform_set_drvdata(pdev, NULL);
+ kfree(keypad);
+ return 0;
+}
+
+static struct platform_driver w90p910_keypad_driver = {
+ .probe = w90p910_keypad_probe,
+ .remove = __devexit_p(w90p910_keypad_remove),
+ .driver = {
+ .name = "w90p910-keypad",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init w90p910_keypad_init(void)
+{
+ return platform_driver_register(&w90p910_keypad_driver);
+}
+
+static void __exit w90p910_keypad_exit(void)
+{
+ platform_driver_unregister(&w90p910_keypad_driver);
+}
+
+module_init(w90p910_keypad_init);
+module_exit(w90p910_keypad_exit);
+
+MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
+MODULE_DESCRIPTION("w90p910 keypad driver!");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:w90p910-keypad");
