[PATCH] OMAP: Add keypad driver

This patch adds support for keypad driver running on different TI
OMAP(http://www.ti.com/omap) processor based boards like OSK, H2, H3, H4,
Persuas and Nokia 770.

Signed-off-by: Komal Shah <komal_shah802003@yahoo.com>
Acked-by: Dmitry Torokhov <dtor@mail.ru>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 492 insertions, 0 deletions

diff --git a/drivers/input/keyboard/omap-keypad.c b/drivers/input/keyboard/omap-keypad.c
new file mode 100644
index 000000000000..d436287d1d2e
--- /dev/null
+++ b/drivers/input/keyboard/omap-keypad.c
@@ -0,0 +1,492 @@
+/*
+ * linux/drivers/input/keyboard/omap-keypad.c
+ *
+ * OMAP Keypad Driver
+ *
+ * Copyright (C) 2003 Nokia Corporation
+ * Written by Timo Teräs <ext-timo.teras@nokia.com>
+ *
+ * Added support for H2 & H3 Keypad
+ * Copyright (C) 2004 Texas Instruments
+ *
+ * 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/types.h>
+#include <linux/input.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <linux/mutex.h>
+#include <linux/errno.h>
+#include <asm/arch/gpio.h>
+#include <asm/arch/keypad.h>
+#include <asm/arch/menelaus.h>
+#include <asm/irq.h>
+#include <asm/hardware.h>
+#include <asm/io.h>
+#include <asm/mach-types.h>
+#include <asm/arch/mux.h>
+
+#undef NEW_BOARD_LEARNING_MODE
+
+static void omap_kp_tasklet(unsigned long);
+static void omap_kp_timer(unsigned long);
+
+static unsigned char keypad_state[8];
+static DEFINE_MUTEX(kp_enable_mutex);
+static int kp_enable = 1;
+static int kp_cur_group = -1;
+
+struct omap_kp {
+        struct input_dev *input;
+        struct timer_list timer;
+        int irq;
+        unsigned int rows;
+        unsigned int cols;
+        unsigned long delay;
+        unsigned int debounce;
+};
+
+DECLARE_TASKLET_DISABLED(kp_tasklet, omap_kp_tasklet, 0);
+
+static int *keymap;
+static unsigned int *row_gpios;
+static unsigned int *col_gpios;
+
+#ifdef CONFIG_ARCH_OMAP2
+static void set_col_gpio_val(struct omap_kp *omap_kp, u8 value)
+{
+        int col;
+        for (col = 0; col < omap_kp->cols; col++) {
+                if (value & (1 << col))
+                        omap_set_gpio_dataout(col_gpios[col], 1);
+                else
+                        omap_set_gpio_dataout(col_gpios[col], 0);
+        }
+}
+
+static u8 get_row_gpio_val(struct omap_kp *omap_kp)
+{
+        int row;
+        u8 value = 0;
+
+        for (row = 0; row < omap_kp->rows; row++) {
+                if (omap_get_gpio_datain(row_gpios[row]))
+                        value |= (1 << row);
+        }
+        return value;
+}
+#else
+#define         set_col_gpio_val(x, y)  do {} while (0)
+#define         get_row_gpio_val(x)     0
+#endif
+
+static irqreturn_t omap_kp_interrupt(int irq, void *dev_id,
+                                     struct pt_regs *regs)
+{
+        struct omap_kp *omap_kp = dev_id;
+
+        /* disable keyboard interrupt and schedule for handling */
+        if (cpu_is_omap24xx()) {
+                int i;
+                for (i = 0; i < omap_kp->rows; i++)
+                        disable_irq(OMAP_GPIO_IRQ(row_gpios[i]));
+        } else
+                /* disable keyboard interrupt and schedule for handling */
+                omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
+
+        tasklet_schedule(&kp_tasklet);
+
+        return IRQ_HANDLED;
+}
+
+static void omap_kp_timer(unsigned long data)
+{
+        tasklet_schedule(&kp_tasklet);
+}
+
+static void omap_kp_scan_keypad(struct omap_kp *omap_kp, unsigned char *state)
+{
+        int col = 0;
+
+        /* read the keypad status */
+        if (cpu_is_omap24xx()) {
+                int i;
+                for (i = 0; i < omap_kp->rows; i++)
+                        disable_irq(OMAP_GPIO_IRQ(row_gpios[i]));
+
+                /* read the keypad status */
+                for (col = 0; col < omap_kp->cols; col++) {
+                        set_col_gpio_val(omap_kp, ~(1 << col));
+                        state[col] = ~(get_row_gpio_val(omap_kp)) & 0x3f;
+                }
+                set_col_gpio_val(omap_kp, 0);
+
+        } else {
+                /* disable keyboard interrupt and schedule for handling */
+                omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
+
+                /* read the keypad status */
+                omap_writew(0xff, OMAP_MPUIO_BASE + OMAP_MPUIO_KBC);
+                for (col = 0; col < omap_kp->cols; col++) {
+                        omap_writew(~(1 << col) & 0xff,
+                                    OMAP_MPUIO_BASE + OMAP_MPUIO_KBC);
+
+                        udelay(omap_kp->delay);
+
+                        state[col] = ~omap_readw(OMAP_MPUIO_BASE +
+                                                 OMAP_MPUIO_KBR_LATCH) & 0xff;
+                }
+                omap_writew(0x00, OMAP_MPUIO_BASE + OMAP_MPUIO_KBC);
+                udelay(2);
+        }
+}
+
+static inline int omap_kp_find_key(int col, int row)
+{
+        int i, key;
+
+        key = KEY(col, row, 0);
+        for (i = 0; keymap[i] != 0; i++)
+                if ((keymap[i] & 0xff000000) == key)
+                        return keymap[i] & 0x00ffffff;
+        return -1;
+}
+
+static void omap_kp_tasklet(unsigned long data)
+{
+        struct omap_kp *omap_kp_data = (struct omap_kp *) data;
+        unsigned char new_state[8], changed, key_down = 0;
+        int col, row;
+        int spurious = 0;
+
+        /* check for any changes */
+        omap_kp_scan_keypad(omap_kp_data, new_state);
+
+        /* check for changes and print those */
+        for (col = 0; col < omap_kp_data->cols; col++) {
+                changed = new_state[col] ^ keypad_state[col];
+                key_down |= new_state[col];
+                if (changed == 0)
+                        continue;
+
+                for (row = 0; row < omap_kp_data->rows; row++) {
+                        int key;
+                        if (!(changed & (1 << row)))
+                                continue;
+#ifdef NEW_BOARD_LEARNING_MODE
+                        printk(KERN_INFO "omap-keypad: key %d-%d %s\n", col,
+                               row, (new_state[col] & (1 << row)) ?
+                               "pressed" : "released");
+#else
+                        key = omap_kp_find_key(col, row);
+                        if (key < 0) {
+                                printk(KERN_WARNING
+                                      "omap-keypad: Spurious key event %d-%d\n",
+                                       col, row);
+                                /* We scan again after a couple of seconds */
+                                spurious = 1;
+                                continue;
+                        }
+
+                        if (!(kp_cur_group == (key & GROUP_MASK) ||
+                              kp_cur_group == -1))
+                                continue;
+
+                        kp_cur_group = key & GROUP_MASK;
+                        input_report_key(omap_kp_data->input, key & ~GROUP_MASK,
+                                         new_state[col] & (1 << row));
+#endif
+                }
+        }
+        memcpy(keypad_state, new_state, sizeof(keypad_state));
+
+        if (key_down) {
+                int delay = HZ / 20;
+                /* some key is pressed - keep irq disabled and use timer
+                 * to poll the keypad */
+                if (spurious)
+                        delay = 2 * HZ;
+                mod_timer(&omap_kp_data->timer, jiffies + delay);
+        } else {
+                /* enable interrupts */
+                if (cpu_is_omap24xx()) {
+                        int i;
+                        for (i = 0; i < omap_kp_data->rows; i++)
+                                enable_irq(OMAP_GPIO_IRQ(row_gpios[i]));
+                } else {
+                        omap_writew(0, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
+                        kp_cur_group = -1;
+                }
+        }
+}
+
+static ssize_t omap_kp_enable_show(struct device *dev,
+                                   struct device_attribute *attr, char *buf)
+{
+        return sprintf(buf, "%u\n", kp_enable);
+}
+
+static ssize_t omap_kp_enable_store(struct device *dev, struct device_attribute *attr,
+                                    const char *buf, size_t count)
+{
+        int state;
+
+        if (sscanf(buf, "%u", &state) != 1)
+                return -EINVAL;
+
+        if ((state != 1) && (state != 0))
+                return -EINVAL;
+
+        mutex_lock(&kp_enable_mutex);
+        if (state != kp_enable) {
+                if (state)
+                        enable_irq(INT_KEYBOARD);
+                else
+                        disable_irq(INT_KEYBOARD);
+                kp_enable = state;
+        }
+        mutex_unlock(&kp_enable_mutex);
+
+        return strnlen(buf, count);
+}
+
+static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, omap_kp_enable_show, omap_kp_enable_store);
+
+#ifdef CONFIG_PM
+static int omap_kp_suspend(struct platform_device *dev, pm_message_t state)
+{
+        /* Nothing yet */
+
+        return 0;
+}
+
+static int omap_kp_resume(struct platform_device *dev)
+{
+        /* Nothing yet */
+
+        return 0;
+}
+#else
+#define omap_kp_suspend NULL
+#define omap_kp_resume  NULL
+#endif
+
+static int __init omap_kp_probe(struct platform_device *pdev)
+{
+        struct omap_kp *omap_kp;
+        struct input_dev *input_dev;
+        struct omap_kp_platform_data *pdata =  pdev->dev.platform_data;
+        int i, col_idx, row_idx, irq_idx, ret;
+
+        if (!pdata->rows || !pdata->cols || !pdata->keymap) {
+                printk(KERN_ERR "No rows, cols or keymap from pdata\n");
+                return -EINVAL;
+        }
+
+        omap_kp = kzalloc(sizeof(struct omap_kp), GFP_KERNEL);
+        input_dev = input_allocate_device();
+        if (!omap_kp || !input_dev) {
+                kfree(omap_kp);
+                input_free_device(input_dev);
+                return -ENOMEM;
+        }
+
+        platform_set_drvdata(pdev, omap_kp);
+
+        omap_kp->input = input_dev;
+
+        /* Disable the interrupt for the MPUIO keyboard */
+        if (!cpu_is_omap24xx())
+                omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
+
+        keymap = pdata->keymap;
+
+        if (pdata->rep)
+                set_bit(EV_REP, input_dev->evbit);
+
+        if (pdata->delay)
+                omap_kp->delay = pdata->delay;
+
+        if (pdata->row_gpios && pdata->col_gpios) {
+                row_gpios = pdata->row_gpios;
+                col_gpios = pdata->col_gpios;
+        }
+
+        omap_kp->rows = pdata->rows;
+        omap_kp->cols = pdata->cols;
+
+        if (cpu_is_omap24xx()) {
+                /* Cols: outputs */
+                for (col_idx = 0; col_idx < omap_kp->cols; col_idx++) {
+                        if (omap_request_gpio(col_gpios[col_idx]) < 0) {
+                                printk(KERN_ERR "Failed to request"
+                                       "GPIO%d for keypad\n",
+                                       col_gpios[col_idx]);
+                                goto err1;
+                        }
+                        omap_set_gpio_direction(col_gpios[col_idx], 0);
+                }
+                /* Rows: inputs */
+                for (row_idx = 0; row_idx < omap_kp->rows; row_idx++) {
+                        if (omap_request_gpio(row_gpios[row_idx]) < 0) {
+                                printk(KERN_ERR "Failed to request"
+                                       "GPIO%d for keypad\n",
+                                       row_gpios[row_idx]);
+                                goto err2;
+                        }
+                        omap_set_gpio_direction(row_gpios[row_idx], 1);
+                }
+        }
+
+        setup_timer(&omap_kp->timer, omap_kp_timer, (unsigned long)omap_kp);
+
+        /* get the irq and init timer*/
+        tasklet_enable(&kp_tasklet);
+        kp_tasklet.data = (unsigned long) omap_kp;
+
+        ret = device_create_file(&pdev->dev, &dev_attr_enable);
+        if (ret < 0)
+                goto err2;
+
+        /* setup input device */
+        set_bit(EV_KEY, input_dev->evbit);
+        for (i = 0; keymap[i] != 0; i++)
+                set_bit(keymap[i] & KEY_MAX, input_dev->keybit);
+        input_dev->name = "omap-keypad";
+        input_dev->phys = "omap-keypad/input0";
+        input_dev->cdev.dev = &pdev->dev;
+        input_dev->private = omap_kp;
+
+        input_dev->id.bustype = BUS_HOST;
+        input_dev->id.vendor = 0x0001;
+        input_dev->id.product = 0x0001;
+        input_dev->id.version = 0x0100;
+
+        input_dev->keycode = keymap;
+        input_dev->keycodesize = sizeof(unsigned int);
+        input_dev->keycodemax = pdata->keymapsize;
+
+        ret = input_register_device(omap_kp->input);
+        if (ret < 0) {
+                printk(KERN_ERR "Unable to register omap-keypad input device\n");
+                goto err3;
+        }
+
+        if (pdata->dbounce)
+                omap_writew(0xff, OMAP_MPUIO_BASE + OMAP_MPUIO_GPIO_DEBOUNCING);
+
+        /* scan current status and enable interrupt */
+        omap_kp_scan_keypad(omap_kp, keypad_state);
+        if (!cpu_is_omap24xx()) {
+                omap_kp->irq = platform_get_irq(pdev, 0);
+                if (omap_kp->irq >= 0) {
+                        if (request_irq(omap_kp->irq, omap_kp_interrupt, 0,
+                                        "omap-keypad", omap_kp) < 0)
+                                goto err4;
+                }
+                omap_writew(0, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
+        } else {
+                for (irq_idx = 0; irq_idx < omap_kp->rows; irq_idx++) {
+                        if (request_irq(OMAP_GPIO_IRQ(row_gpios[irq_idx]),
+                                        omap_kp_interrupt,
+                                        IRQF_TRIGGER_FALLING,
+                                        "omap-keypad", omap_kp) < 0)
+                                goto err5;
+                }
+        }
+        return 0;
+err5:
+        for (i = irq_idx-1; i >=0; i--)
+                free_irq(row_gpios[i], 0);
+err4:
+        input_unregister_device(omap_kp->input);
+        input_dev = NULL;
+err3:
+        device_remove_file(&pdev->dev, &dev_attr_enable);
+err2:
+        for (i = row_idx-1; i >=0; i--)
+                omap_free_gpio(row_gpios[i]);
+err1:
+        for (i = col_idx-1; i >=0; i--)
+                omap_free_gpio(col_gpios[i]);
+
+        kfree(omap_kp);
+        input_free_device(input_dev);
+
+        return -EINVAL;
+}
+
+static int omap_kp_remove(struct platform_device *pdev)
+{
+        struct omap_kp *omap_kp = platform_get_drvdata(pdev);
+
+        /* disable keypad interrupt handling */
+        tasklet_disable(&kp_tasklet);
+        if (cpu_is_omap24xx()) {
+                int i;
+                for (i = 0; i < omap_kp->cols; i++)
+                        omap_free_gpio(col_gpios[i]);
+                for (i = 0; i < omap_kp->rows; i++) {
+                        omap_free_gpio(row_gpios[i]);
+                        free_irq(OMAP_GPIO_IRQ(row_gpios[i]), 0);
+                }
+        } else {
+                omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
+                free_irq(omap_kp->irq, 0);
+        }
+
+        del_timer_sync(&omap_kp->timer);
+        tasklet_kill(&kp_tasklet);
+
+        /* unregister everything */
+        input_unregister_device(omap_kp->input);
+
+        kfree(omap_kp);
+
+        return 0;
+}
+
+static struct platform_driver omap_kp_driver = {
+        .probe          = omap_kp_probe,
+        .remove         = omap_kp_remove,
+        .suspend        = omap_kp_suspend,
+        .resume         = omap_kp_resume,
+        .driver         = {
+                .name   = "omap-keypad",
+        },
+};
+
+static int __devinit omap_kp_init(void)
+{
+        printk(KERN_INFO "OMAP Keypad Driver\n");
+        return platform_driver_register(&omap_kp_driver);
+}
+
+static void __exit omap_kp_exit(void)
+{
+        platform_driver_unregister(&omap_kp_driver);
+}
+
+module_init(omap_kp_init);
+module_exit(omap_kp_exit);
+
+MODULE_AUTHOR("Timo Teräs");
+MODULE_DESCRIPTION("OMAP Keypad Driver");
+MODULE_LICENSE("GPL");