Input: add support for OMAP4 keyboard controller
Abraham Arce [Wed, 1 Sep 2010 00:05:27 +0000 (17:05 -0700)]
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>

arch/arm/plat-omap/include/plat/omap4-keypad.h [new file with mode: 0644]
drivers/input/keyboard/Kconfig
drivers/input/keyboard/Makefile
drivers/input/keyboard/omap4-keypad.c [new file with mode: 0644]

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 (file)
index 0000000..522a8ab
--- /dev/null
@@ -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
index 9cc488d..4f30048 100644 (file)
@@ -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
index 504b591..8ac01fb 100644 (file)
@@ -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 (file)
index 0000000..975f8bb
--- /dev/null
@@ -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");