1 files changed, 322 insertions, 0 deletions
diff --git a/drivers/input/keyboard/omap-keypad.c b/drivers/input/keyboard/omap-keypad.c
new file mode 100644
index 000000000..57447d6c9
--- /dev/null
+++ b/drivers/input/keyboard/omap-keypad.c
@@ -0,0 +1,322 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * 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
+ */
+
+#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>
+#include <linux/soc/ti/omap1-io.h>
+
+#undef NEW_BOARD_LEARNING_MODE
+
+static void omap_kp_tasklet(unsigned long);
+static void omap_kp_timer(struct timer_list *);
+
+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_OLD(kp_tasklet, omap_kp_tasklet);
+
+static unsigned int *row_gpios;
+static unsigned int *col_gpios;
+
+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(struct timer_list *unused)
+{
+	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;
+
+	/* 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 (!(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) {
+		/* some key is pressed - keep irq disabled and use timer
+		 * to poll the keypad */
+		mod_timer(&omap_kp_data->timer, jiffies + HZ / 20);
+	} 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);
+
+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(struct_size(omap_kp, keymap, keycodemax), 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;
+
+	timer_setup(&omap_kp->timer, omap_kp_timer, 0);
+
+	/* get the irq and init timer*/
+	kp_tasklet.data = (unsigned long) omap_kp;
+	tasklet_enable(&kp_tasklet);
+
+	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,
+	.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");