--- /dev/null
+/*
+ * 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");
projects / karo-tx-linux.git / commitdiff