1 files changed, 281 insertions, 0 deletions

diff --git a/drivers/input/keyboard/w90p910_keypad.c b/drivers/input/keyboard/w90p910_keypad.c
new file mode 100644
index 000000000000..6032def03707
--- /dev/null
+++ b/drivers/input/keyboard/w90p910_keypad.c
@@ -0,0 +1,281 @@
+/*
+ * 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 W90P910_MAX_KEY_NUM     (8 * 8)
+#define W90P910_ROW_SHIFT       3
+
+struct w90p910_keypad {
+        const struct w90p910_keypad_platform_data *pdata;
+        struct clk *clk;
+        struct input_dev *input_dev;
+        void __iomem *mmio_base;
+        int irq;
+        unsigned short keymap[W90P910_MAX_KEY_NUM];
+};
+
+static void w90p910_keypad_scan_matrix(struct w90p910_keypad *keypad,
+                                                        unsigned int status)
+{
+        struct input_dev *input_dev = keypad->input_dev;
+        unsigned int row = KGET_RAW(status);
+        unsigned int col = KGET_COLUMN(status);
+        unsigned int code = MATRIX_SCAN_CODE(row, col, W90P910_ROW_SHIFT);
+        unsigned int key = keypad->keymap[code];
+
+        input_event(input_dev, EV_MSC, MSC_SCAN, code);
+        input_report_key(input_dev, key, 1);
+        input_sync(input_dev);
+
+        input_event(input_dev, EV_MSC, MSC_SCAN, code);
+        input_report_key(input_dev, key, 0);
+        input_sync(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);
+        const 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)
+{
+        const struct w90p910_keypad_platform_data *pdata =
+                                                pdev->dev.platform_data;
+        const struct matrix_keymap_data *keymap_data;
+        struct w90p910_keypad *keypad;
+        struct input_dev *input_dev;
+        struct resource *res;
+        int irq;
+        int error;
+
+        if (!pdata) {
+                dev_err(&pdev->dev, "no platform data defined\n");
+                return -EINVAL;
+        }
+
+        keymap_data = pdata->keymap_data;
+
+        irq = platform_get_irq(pdev, 0);
+        if (irq < 0) {
+                dev_err(&pdev->dev, "failed to get keypad irq\n");
+                return -ENXIO;
+        }
+
+        keypad = kzalloc(sizeof(struct w90p910_keypad), GFP_KERNEL);
+        input_dev = input_allocate_device();
+        if (!keypad || !input_dev) {
+                dev_err(&pdev->dev, "failed to allocate driver data\n");
+                error = -ENOMEM;
+                goto failed_free;
+        }
+
+        keypad->pdata = pdata;
+        keypad->input_dev = input_dev;
+        keypad->irq = irq;
+
+        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_res;
+        }
+
+        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;
+        }
+
+        /* 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->keymap;
+        input_dev->keycodesize = sizeof(keypad->keymap[0]);
+        input_dev->keycodemax = ARRAY_SIZE(keypad->keymap);
+
+        input_set_drvdata(input_dev, keypad);
+
+        input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
+        input_set_capability(input_dev, EV_MSC, MSC_SCAN);
+
+        matrix_keypad_build_keymap(keymap_data, W90P910_ROW_SHIFT,
+                                   input_dev->keycode, input_dev->keybit);
+
+        error = request_irq(keypad->irq, w90p910_keypad_irq_handler,
+                            IRQF_DISABLED, pdev->name, keypad);
+        if (error) {
+                dev_err(&pdev->dev, "failed to request IRQ\n");
+                goto failed_put_clk;
+        }
+
+        /* 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;
+        }
+
+        platform_set_drvdata(pdev, keypad);
+        return 0;
+
+failed_free_irq:
+        free_irq(irq, pdev);
+failed_put_clk:
+        clk_put(keypad->clk);
+failed_free_io:
+        iounmap(keypad->mmio_base);
+failed_free_res:
+        release_mem_region(res->start, resource_size(res));
+failed_free:
+        input_free_device(input_dev);
+        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   = "nuc900-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:nuc900-keypad");