--- /dev/null
+/*
+ * 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/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 <linux/slab.h>
+#include <linux/gpio.h>
+#include <linux/platform_data/gpio-omap.h>
+#include <linux/platform_data/keypad-omap.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;
+ unsigned short keymap[];
+};
+
+static DECLARE_TASKLET_DISABLED(kp_tasklet, omap_kp_tasklet, 0);
+
+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++)
+ gpio_set_value(col_gpios[col], value & (1 << col));
+}
+
+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 (gpio_get_value(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)
+{
+ /* disable keyboard interrupt and schedule for handling */
+ omap_writew(1, OMAP1_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;
+
+ /* disable keyboard interrupt and schedule for handling */
+ omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
+
+ /* read the keypad status */
+ omap_writew(0xff, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC);
+ for (col = 0; col < omap_kp->cols; col++) {
+ omap_writew(~(1 << col) & 0xff,
+ OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC);
+
+ udelay(omap_kp->delay);
+
+ state[col] = ~omap_readw(OMAP1_MPUIO_BASE +
+ OMAP_MPUIO_KBR_LATCH) & 0xff;
+ }
+ omap_writew(0x00, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC);
+ udelay(2);
+}
+
+static void omap_kp_tasklet(unsigned long data)
+{
+ struct omap_kp *omap_kp_data = (struct omap_kp *) data;
+ unsigned short *keycodes = omap_kp_data->input->keycode;
+ unsigned int row_shift = get_count_order(omap_kp_data->cols);
+ 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 = keycodes[MATRIX_SCAN_CODE(row, col, row_shift)];
+ 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
+ }
+ }
+ input_sync(omap_kp_data->input);
+ 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 */
+ omap_writew(0, OMAP1_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)
+{
+ struct omap_kp *omap_kp = dev_get_drvdata(dev);
+ 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(omap_kp->irq);
+ else
+ disable_irq(omap_kp->irq);
+ 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 omap_kp_probe(struct platform_device *pdev)
+{
+ struct omap_kp *omap_kp;
+ struct input_dev *input_dev;
+ struct omap_kp_platform_data *pdata = dev_get_platdata(&pdev->dev);
+ int i, col_idx, row_idx, ret;
+ unsigned int row_shift, keycodemax;
+
+ if (!pdata->rows || !pdata->cols || !pdata->keymap_data) {
+ printk(KERN_ERR "No rows, cols or keymap_data from pdata\n");
+ return -EINVAL;
+ }
+
+ row_shift = get_count_order(pdata->cols);
+ keycodemax = pdata->rows << row_shift;
+
+ omap_kp = kzalloc(sizeof(struct omap_kp) +
+ keycodemax * sizeof(unsigned short), 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 */
+ omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
+
+ 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;
+
+ col_idx = 0;
+ row_idx = 0;
+
+ 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 */
+ input_dev->name = "omap-keypad";
+ input_dev->phys = "omap-keypad/input0";
+ 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 = 0x0100;
+
+ if (pdata->rep)
+ __set_bit(EV_REP, input_dev->evbit);
+
+ ret = matrix_keypad_build_keymap(pdata->keymap_data, NULL,
+ pdata->rows, pdata->cols,
+ omap_kp->keymap, input_dev);
+ if (ret < 0)
+ goto err3;
+
+ 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, OMAP1_MPUIO_BASE + OMAP_MPUIO_GPIO_DEBOUNCING);
+
+ /* scan current status and enable interrupt */
+ omap_kp_scan_keypad(omap_kp, keypad_state);
+ 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, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
+
+ return 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--)
+ gpio_free(row_gpios[i]);
+ for (i = col_idx - 1; i >= 0; i--)
+ gpio_free(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);
+ omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
+ free_irq(omap_kp->irq, omap_kp);
+
+ 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",
+ },
+};
+module_platform_driver(omap_kp_driver);
+
+MODULE_AUTHOR("Timo Teräs");
+MODULE_DESCRIPTION("OMAP Keypad Driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:omap-keypad");
Code Review / kvmfornfv.git / blobdiff