Input: add support for OMAP4 keyboard controller

OMAP4 keyboard controller includes:
  - built-in scanning algorithm
  - debouncing feature

Driver implementation is based on matrix_keypad.c

Signed-off-by: Syed Rafiuddin <rafiuddin.syed@ti.com>
Signed-off-by: Abraham Arce <x0066660@ti.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

4 files changed, 313 insertions, 0 deletions

diff --git a/arch/arm/plat-omap/include/plat/omap4-keypad.h b/arch/arm/plat-omap/include/plat/omap4-keypad.h
new file mode 100644
index 000000000000..522a8ab5c5ff
--- /dev/null
+++ b/arch/arm/plat-omap/include/plat/omap4-keypad.h
@@ -0,0 +1,16 @@
+#ifndef ARCH_ARM_PLAT_OMAP4_KEYPAD_H
+#define ARCH_ARM_PLAT_OMAP4_KEYPAD_H
+
+#include <linux/input/matrix_keypad.h>
+
+struct omap4_keypad_platform_data {
+        const struct matrix_keymap_data *keymap_data;
+
+        u8 rows;
+        u8 cols;
+
+        u16 irq;
+        void __iomem *base;
+};
+
+#endif
diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
index 9cc488d21490..4f300488e1f3 100644
--- a/drivers/input/keyboard/Kconfig
+++ b/drivers/input/keyboard/Kconfig
@@ -424,6 +424,15 @@ config KEYBOARD_OMAP
           To compile this driver as a module, choose M here: the
           module will be called omap-keypad.
 
+config KEYBOARD_OMAP4
+        tristate "TI OMAP4 keypad support"
+        depends on ARCH_OMAP4
+        help
+          Say Y here if you want to use the OMAP4 keypad.
+
+          To compile this driver as a module, choose M here: the
+          module will be called omap4-keypad.
+
 config KEYBOARD_TWL4030
         tristate "TI TWL4030/TWL5030/TPS659x0 keypad support"
         depends on TWL4030_CORE
diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile
index 504b591be0cd..8ac01fb642c1 100644
--- a/drivers/input/keyboard/Makefile
+++ b/drivers/input/keyboard/Makefile
@@ -29,6 +29,7 @@ obj-$(CONFIG_KEYBOARD_MAX7359)		+= max7359_keypad.o
 obj-$(CONFIG_KEYBOARD_MCS)              += mcs_touchkey.o
 obj-$(CONFIG_KEYBOARD_NEWTON)           += newtonkbd.o
 obj-$(CONFIG_KEYBOARD_OMAP)             += omap-keypad.o
+obj-$(CONFIG_KEYBOARD_OMAP4)            += omap4-keypad.o
 obj-$(CONFIG_KEYBOARD_OPENCORES)        += opencores-kbd.o
 obj-$(CONFIG_KEYBOARD_PXA27x)           += pxa27x_keypad.o
 obj-$(CONFIG_KEYBOARD_PXA930_ROTARY)    += pxa930_rotary.o
diff --git a/drivers/input/keyboard/omap4-keypad.c b/drivers/input/keyboard/omap4-keypad.c
new file mode 100644
index 000000000000..975f8bbcc69b
--- /dev/null
+++ b/drivers/input/keyboard/omap4-keypad.c
@@ -0,0 +1,287 @@
+/*
+ * OMAP4 Keypad Driver
+ *
+ * Copyright (C) 2010 Texas Instruments
+ *
+ * Author: Abraham Arce <x0066660@ti.com>
+ * Initial Code: Syed Rafiuddin <rafiuddin.syed@ti.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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/errno.h>
+#include <linux/io.h>
+#include <linux/input.h>
+#include <linux/slab.h>
+
+#include <plat/omap4-keypad.h>
+
+/* OMAP4 registers */
+#define OMAP4_KBD_REVISION              0x00
+#define OMAP4_KBD_SYSCONFIG             0x10
+#define OMAP4_KBD_SYSSTATUS             0x14
+#define OMAP4_KBD_IRQSTATUS             0x18
+#define OMAP4_KBD_IRQENABLE             0x1C
+#define OMAP4_KBD_WAKEUPENABLE          0x20
+#define OMAP4_KBD_PENDING               0x24
+#define OMAP4_KBD_CTRL                  0x28
+#define OMAP4_KBD_DEBOUNCINGTIME        0x2C
+#define OMAP4_KBD_LONGKEYTIME           0x30
+#define OMAP4_KBD_TIMEOUT               0x34
+#define OMAP4_KBD_STATEMACHINE          0x38
+#define OMAP4_KBD_ROWINPUTS             0x3C
+#define OMAP4_KBD_COLUMNOUTPUTS         0x40
+#define OMAP4_KBD_FULLCODE31_0          0x44
+#define OMAP4_KBD_FULLCODE63_32         0x48
+
+/* OMAP4 bit definitions */
+#define OMAP4_DEF_SYSCONFIG_SOFTRST     (1 << 1)
+#define OMAP4_DEF_SYSCONFIG_ENAWKUP     (1 << 2)
+#define OMAP4_DEF_IRQENABLE_EVENTEN     (1 << 0)
+#define OMAP4_DEF_IRQENABLE_LONGKEY     (1 << 1)
+#define OMAP4_DEF_IRQENABLE_TIMEOUTEN   (1 << 2)
+#define OMAP4_DEF_CTRL_NOSOFTMODE       (1 << 1)
+#define OMAP4_DEF_CTRLPTVVALUE          (1 << 2)
+#define OMAP4_DEF_CTRLPTV               (1 << 1)
+#define OMAP4_DEF_IRQDISABLE            0x00
+
+/* OMAP4 values */
+#define OMAP4_VAL_DEBOUNCINGTIME        0x07
+#define OMAP4_VAL_FUNCTIONALCFG         0x1E
+
+#define OMAP4_MASK_IRQSTATUSDISABLE     0xFFFF
+
+struct omap4_keypad {
+        struct input_dev *input;
+
+        void __iomem *base;
+        int irq;
+
+        unsigned int rows;
+        unsigned int cols;
+        unsigned int row_shift;
+        unsigned char key_state[8];
+        unsigned short keymap[];
+};
+
+static void __devinit omap4_keypad_config(struct omap4_keypad *keypad_data)
+{
+        __raw_writel(OMAP4_DEF_SYSCONFIG_SOFTRST | OMAP4_DEF_SYSCONFIG_ENAWKUP,
+                        keypad_data->base + OMAP4_KBD_SYSCONFIG);
+        __raw_writel(OMAP4_VAL_FUNCTIONALCFG,
+                        keypad_data->base + OMAP4_KBD_CTRL);
+        __raw_writel(OMAP4_VAL_DEBOUNCINGTIME,
+                        keypad_data->base + OMAP4_KBD_DEBOUNCINGTIME);
+        __raw_writel(OMAP4_DEF_IRQDISABLE,
+                        keypad_data->base + OMAP4_KBD_IRQSTATUS);
+        __raw_writel(OMAP4_DEF_IRQENABLE_EVENTEN | OMAP4_DEF_IRQENABLE_LONGKEY,
+                        keypad_data->base + OMAP4_KBD_IRQENABLE);
+}
+
+/* Interrupt handler */
+static irqreturn_t omap4_keypad_interrupt(int irq, void *dev_id)
+{
+        struct omap4_keypad *keypad_data = dev_id;
+        struct input_dev *input_dev = keypad_data->input;
+        unsigned char key_state[ARRAY_SIZE(keypad_data->key_state)];
+        unsigned int col, row, code, changed;
+        u32 *new_state = (u32 *) key_state;
+
+        /* Disable interrupts */
+        __raw_writel(OMAP4_DEF_IRQDISABLE,
+                     keypad_data->base + OMAP4_KBD_IRQENABLE);
+
+        *new_state = __raw_readl(keypad_data->base + OMAP4_KBD_FULLCODE31_0);
+        *(new_state + 1) = __raw_readl(keypad_data->base + OMAP4_KBD_FULLCODE63_32);
+
+        for (row = 0; row < keypad_data->rows; row++) {
+                changed = key_state[row] ^ keypad_data->key_state[row];
+                if (!changed)
+                        continue;
+
+                for (col = 0; col < keypad_data->cols; col++) {
+                        if (changed & (1 << col)) {
+                                code = MATRIX_SCAN_CODE(row, col,
+                                                keypad_data->row_shift);
+                                input_event(input_dev, EV_MSC, MSC_SCAN, code);
+                                input_report_key(input_dev,
+                                                 keypad_data->keymap[code],
+                                                 key_state[row] & (1 << col));
+                        }
+                }
+        }
+
+        input_sync(input_dev);
+
+        memcpy(keypad_data->key_state, key_state,
+                sizeof(keypad_data->key_state));
+
+        /* clear pending interrupts */
+        __raw_writel(__raw_readl(keypad_data->base + OMAP4_KBD_IRQSTATUS),
+                        keypad_data->base + OMAP4_KBD_IRQSTATUS);
+
+        /* enable interrupts */
+        __raw_writel(OMAP4_DEF_IRQENABLE_EVENTEN | OMAP4_DEF_IRQENABLE_LONGKEY,
+                        keypad_data->base + OMAP4_KBD_IRQENABLE);
+
+        return IRQ_HANDLED;
+}
+
+static int __devinit omap4_keypad_probe(struct platform_device *pdev)
+{
+        const struct omap4_keypad_platform_data *pdata;
+        struct omap4_keypad *keypad_data;
+        struct input_dev *input_dev;
+        unsigned int row_shift, max_keys;
+        int error;
+
+        /* platform data */
+        pdata = pdev->dev.platform_data;
+        if (!pdata) {
+                dev_err(&pdev->dev, "no platform data defined\n");
+                return -EINVAL;
+        }
+
+        if (!pdata->base) {
+                dev_err(&pdev->dev, "no base address specified\n");
+                return -EINVAL;
+        }
+
+        if (!pdata->irq) {
+                dev_err(&pdev->dev, "no keyboard irq assigned\n");
+                return -EINVAL;
+        }
+
+        if (!pdata->keymap_data) {
+                dev_err(&pdev->dev, "no keymap data defined\n");
+                return -EINVAL;
+        }
+
+        row_shift = get_count_order(pdata->cols);
+        max_keys = pdata->rows << row_shift;
+
+        keypad_data = kzalloc(sizeof(struct omap4_keypad) +
+                                max_keys * sizeof(keypad_data->keymap[0]),
+                              GFP_KERNEL);
+        if (!keypad_data) {
+                dev_err(&pdev->dev, "keypad_data memory allocation failed\n");
+                return -ENOMEM;
+        }
+
+        keypad_data->base = pdata->base;
+        keypad_data->irq = pdata->irq;
+
+        keypad_data->row_shift = row_shift;
+        keypad_data->rows = pdata->rows;
+        keypad_data->cols = pdata->cols;
+
+        /* input device allocation */
+        keypad_data->input = input_dev = input_allocate_device();
+        if (!input_dev) {
+                error = -ENOMEM;
+                goto err_free_keypad;
+        }
+
+        input_dev->name = pdev->name;
+        input_dev->dev.parent = &pdev->dev;
+        input_dev->id.bustype = BUS_HOST;
+        input_dev->id.vendor = 0x0001;
+        input_dev->id.product = 0x0001;
+        input_dev->id.version = 0x0001;
+
+        input_dev->keycode      = keypad_data->keymap;
+        input_dev->keycodesize  = sizeof(keypad_data->keymap[0]);
+        input_dev->keycodemax   = max_keys;
+
+        __set_bit(EV_KEY, input_dev->evbit);
+        __set_bit(EV_REP, input_dev->evbit);
+
+        input_set_capability(input_dev, EV_MSC, MSC_SCAN);
+
+        input_set_drvdata(input_dev, keypad_data);
+
+        matrix_keypad_build_keymap(pdata->keymap_data, row_shift,
+                        input_dev->keycode, input_dev->keybit);
+
+        omap4_keypad_config(keypad_data);
+
+        error = request_irq(keypad_data->irq, omap4_keypad_interrupt,
+                             IRQF_TRIGGER_FALLING,
+                             "omap4-keypad", keypad_data);
+        if (error) {
+                dev_err(&pdev->dev, "failed to register interrupt\n");
+                goto err_free_input;
+        }
+
+        error = input_register_device(keypad_data->input);
+        if (error < 0) {
+                dev_err(&pdev->dev, "failed to register input device\n");
+                goto err_free_irq;
+        }
+
+
+        platform_set_drvdata(pdev, keypad_data);
+        return 0;
+
+err_free_irq:
+        free_irq(keypad_data->irq, keypad_data);
+err_free_input:
+        input_free_device(input_dev);
+err_free_keypad:
+        kfree(keypad_data);
+        return error;
+}
+
+static int __devexit omap4_keypad_remove(struct platform_device *pdev)
+{
+        struct omap4_keypad *keypad_data = platform_get_drvdata(pdev);
+
+        free_irq(keypad_data->irq, keypad_data);
+        input_unregister_device(keypad_data->input);
+        kfree(keypad_data);
+        platform_set_drvdata(pdev, NULL);
+
+        return 0;
+}
+
+static struct platform_driver omap4_keypad_driver = {
+        .probe          = omap4_keypad_probe,
+        .remove         = __devexit_p(omap4_keypad_remove),
+        .driver         = {
+                .name   = "omap4-keypad",
+                .owner  = THIS_MODULE,
+        },
+};
+
+static int __init omap4_keypad_init(void)
+{
+        return platform_driver_register(&omap4_keypad_driver);
+}
+module_init(omap4_keypad_init);
+
+static void __exit omap4_keypad_exit(void)
+{
+        platform_driver_unregister(&omap4_keypad_driver);
+}
+module_exit(omap4_keypad_exit);
+
+MODULE_AUTHOR("Texas Instruments");
+MODULE_DESCRIPTION("OMAP4 Keypad Driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:omap4-keypad");