--- /dev/null
+/*
+ * DaVinci Key Scan Driver for TI platforms
+ *
+ * Copyright (C) 2009 Texas Instruments, Inc
+ *
+ * Author: Miguel Aguilar <miguel.aguilar@ridgerun.com>
+ *
+ * Initial Code: Sandeep Paulraj <s-paulraj@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/types.h>
+#include <linux/input.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+
+#include <asm/irq.h>
+
+#include <mach/hardware.h>
+#include <mach/irqs.h>
+#include <linux/platform_data/keyscan-davinci.h>
+
+/* Key scan registers */
+#define DAVINCI_KEYSCAN_KEYCTRL 0x0000
+#define DAVINCI_KEYSCAN_INTENA 0x0004
+#define DAVINCI_KEYSCAN_INTFLAG 0x0008
+#define DAVINCI_KEYSCAN_INTCLR 0x000c
+#define DAVINCI_KEYSCAN_STRBWIDTH 0x0010
+#define DAVINCI_KEYSCAN_INTERVAL 0x0014
+#define DAVINCI_KEYSCAN_CONTTIME 0x0018
+#define DAVINCI_KEYSCAN_CURRENTST 0x001c
+#define DAVINCI_KEYSCAN_PREVSTATE 0x0020
+#define DAVINCI_KEYSCAN_EMUCTRL 0x0024
+#define DAVINCI_KEYSCAN_IODFTCTRL 0x002c
+
+/* Key Control Register (KEYCTRL) */
+#define DAVINCI_KEYSCAN_KEYEN 0x00000001
+#define DAVINCI_KEYSCAN_PREVMODE 0x00000002
+#define DAVINCI_KEYSCAN_CHATOFF 0x00000004
+#define DAVINCI_KEYSCAN_AUTODET 0x00000008
+#define DAVINCI_KEYSCAN_SCANMODE 0x00000010
+#define DAVINCI_KEYSCAN_OUTTYPE 0x00000020
+
+/* Masks for the interrupts */
+#define DAVINCI_KEYSCAN_INT_CONT 0x00000008
+#define DAVINCI_KEYSCAN_INT_OFF 0x00000004
+#define DAVINCI_KEYSCAN_INT_ON 0x00000002
+#define DAVINCI_KEYSCAN_INT_CHANGE 0x00000001
+#define DAVINCI_KEYSCAN_INT_ALL 0x0000000f
+
+struct davinci_ks {
+ struct input_dev *input;
+ struct davinci_ks_platform_data *pdata;
+ int irq;
+ void __iomem *base;
+ resource_size_t pbase;
+ size_t base_size;
+ unsigned short keymap[];
+};
+
+/* Initializing the kp Module */
+static int __init davinci_ks_initialize(struct davinci_ks *davinci_ks)
+{
+ struct device *dev = &davinci_ks->input->dev;
+ struct davinci_ks_platform_data *pdata = davinci_ks->pdata;
+ u32 matrix_ctrl;
+
+ /* Enable all interrupts */
+ __raw_writel(DAVINCI_KEYSCAN_INT_ALL,
+ davinci_ks->base + DAVINCI_KEYSCAN_INTENA);
+
+ /* Clear interrupts if any */
+ __raw_writel(DAVINCI_KEYSCAN_INT_ALL,
+ davinci_ks->base + DAVINCI_KEYSCAN_INTCLR);
+
+ /* Setup the scan period = strobe + interval */
+ __raw_writel(pdata->strobe,
+ davinci_ks->base + DAVINCI_KEYSCAN_STRBWIDTH);
+ __raw_writel(pdata->interval,
+ davinci_ks->base + DAVINCI_KEYSCAN_INTERVAL);
+ __raw_writel(0x01,
+ davinci_ks->base + DAVINCI_KEYSCAN_CONTTIME);
+
+ /* Define matrix type */
+ switch (pdata->matrix_type) {
+ case DAVINCI_KEYSCAN_MATRIX_4X4:
+ matrix_ctrl = 0;
+ break;
+ case DAVINCI_KEYSCAN_MATRIX_5X3:
+ matrix_ctrl = (1 << 6);
+ break;
+ default:
+ dev_err(dev->parent, "wrong matrix type\n");
+ return -EINVAL;
+ }
+
+ /* Enable key scan module and set matrix type */
+ __raw_writel(DAVINCI_KEYSCAN_AUTODET | DAVINCI_KEYSCAN_KEYEN |
+ matrix_ctrl, davinci_ks->base + DAVINCI_KEYSCAN_KEYCTRL);
+
+ return 0;
+}
+
+static irqreturn_t davinci_ks_interrupt(int irq, void *dev_id)
+{
+ struct davinci_ks *davinci_ks = dev_id;
+ struct device *dev = &davinci_ks->input->dev;
+ unsigned short *keymap = davinci_ks->keymap;
+ int keymapsize = davinci_ks->pdata->keymapsize;
+ u32 prev_status, new_status, changed;
+ bool release;
+ int keycode = KEY_UNKNOWN;
+ int i;
+
+ /* Disable interrupt */
+ __raw_writel(0x0, davinci_ks->base + DAVINCI_KEYSCAN_INTENA);
+
+ /* Reading previous and new status of the key scan */
+ prev_status = __raw_readl(davinci_ks->base + DAVINCI_KEYSCAN_PREVSTATE);
+ new_status = __raw_readl(davinci_ks->base + DAVINCI_KEYSCAN_CURRENTST);
+
+ changed = prev_status ^ new_status;
+
+ if (changed) {
+ /*
+ * It goes through all bits in 'changed' to ensure
+ * that no key changes are being missed
+ */
+ for (i = 0 ; i < keymapsize; i++) {
+ if ((changed>>i) & 0x1) {
+ keycode = keymap[i];
+ release = (new_status >> i) & 0x1;
+ dev_dbg(dev->parent, "key %d %s\n", keycode,
+ release ? "released" : "pressed");
+ input_report_key(davinci_ks->input, keycode,
+ !release);
+ input_sync(davinci_ks->input);
+ }
+ }
+ /* Clearing interrupt */
+ __raw_writel(DAVINCI_KEYSCAN_INT_ALL,
+ davinci_ks->base + DAVINCI_KEYSCAN_INTCLR);
+ }
+
+ /* Enable interrupts */
+ __raw_writel(0x1, davinci_ks->base + DAVINCI_KEYSCAN_INTENA);
+
+ return IRQ_HANDLED;
+}
+
+static int __init davinci_ks_probe(struct platform_device *pdev)
+{
+ struct davinci_ks *davinci_ks;
+ struct input_dev *key_dev;
+ struct resource *res, *mem;
+ struct device *dev = &pdev->dev;
+ struct davinci_ks_platform_data *pdata = dev_get_platdata(&pdev->dev);
+ int error, i;
+
+ if (pdata->device_enable) {
+ error = pdata->device_enable(dev);
+ if (error < 0) {
+ dev_dbg(dev, "device enable function failed\n");
+ return error;
+ }
+ }
+
+ if (!pdata->keymap) {
+ dev_dbg(dev, "no keymap from pdata\n");
+ return -EINVAL;
+ }
+
+ davinci_ks = kzalloc(sizeof(struct davinci_ks) +
+ sizeof(unsigned short) * pdata->keymapsize, GFP_KERNEL);
+ if (!davinci_ks) {
+ dev_dbg(dev, "could not allocate memory for private data\n");
+ return -ENOMEM;
+ }
+
+ memcpy(davinci_ks->keymap, pdata->keymap,
+ sizeof(unsigned short) * pdata->keymapsize);
+
+ key_dev = input_allocate_device();
+ if (!key_dev) {
+ dev_dbg(dev, "could not allocate input device\n");
+ error = -ENOMEM;
+ goto fail1;
+ }
+
+ davinci_ks->input = key_dev;
+
+ davinci_ks->irq = platform_get_irq(pdev, 0);
+ if (davinci_ks->irq < 0) {
+ dev_err(dev, "no key scan irq\n");
+ error = davinci_ks->irq;
+ goto fail2;
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(dev, "no mem resource\n");
+ error = -EINVAL;
+ goto fail2;
+ }
+
+ davinci_ks->pbase = res->start;
+ davinci_ks->base_size = resource_size(res);
+
+ mem = request_mem_region(davinci_ks->pbase, davinci_ks->base_size,
+ pdev->name);
+ if (!mem) {
+ dev_err(dev, "key scan registers at %08x are not free\n",
+ davinci_ks->pbase);
+ error = -EBUSY;
+ goto fail2;
+ }
+
+ davinci_ks->base = ioremap(davinci_ks->pbase, davinci_ks->base_size);
+ if (!davinci_ks->base) {
+ dev_err(dev, "can't ioremap MEM resource.\n");
+ error = -ENOMEM;
+ goto fail3;
+ }
+
+ /* Enable auto repeat feature of Linux input subsystem */
+ if (pdata->rep)
+ __set_bit(EV_REP, key_dev->evbit);
+
+ /* Setup input device */
+ __set_bit(EV_KEY, key_dev->evbit);
+
+ /* Setup the platform data */
+ davinci_ks->pdata = pdata;
+
+ for (i = 0; i < davinci_ks->pdata->keymapsize; i++)
+ __set_bit(davinci_ks->pdata->keymap[i], key_dev->keybit);
+
+ key_dev->name = "davinci_keyscan";
+ key_dev->phys = "davinci_keyscan/input0";
+ key_dev->dev.parent = &pdev->dev;
+ key_dev->id.bustype = BUS_HOST;
+ key_dev->id.vendor = 0x0001;
+ key_dev->id.product = 0x0001;
+ key_dev->id.version = 0x0001;
+ key_dev->keycode = davinci_ks->keymap;
+ key_dev->keycodesize = sizeof(davinci_ks->keymap[0]);
+ key_dev->keycodemax = davinci_ks->pdata->keymapsize;
+
+ error = input_register_device(davinci_ks->input);
+ if (error < 0) {
+ dev_err(dev, "unable to register davinci key scan device\n");
+ goto fail4;
+ }
+
+ error = request_irq(davinci_ks->irq, davinci_ks_interrupt,
+ 0, pdev->name, davinci_ks);
+ if (error < 0) {
+ dev_err(dev, "unable to register davinci key scan interrupt\n");
+ goto fail5;
+ }
+
+ error = davinci_ks_initialize(davinci_ks);
+ if (error < 0) {
+ dev_err(dev, "unable to initialize davinci key scan device\n");
+ goto fail6;
+ }
+
+ platform_set_drvdata(pdev, davinci_ks);
+ return 0;
+
+fail6:
+ free_irq(davinci_ks->irq, davinci_ks);
+fail5:
+ input_unregister_device(davinci_ks->input);
+ key_dev = NULL;
+fail4:
+ iounmap(davinci_ks->base);
+fail3:
+ release_mem_region(davinci_ks->pbase, davinci_ks->base_size);
+fail2:
+ input_free_device(key_dev);
+fail1:
+ kfree(davinci_ks);
+
+ return error;
+}
+
+static int davinci_ks_remove(struct platform_device *pdev)
+{
+ struct davinci_ks *davinci_ks = platform_get_drvdata(pdev);
+
+ free_irq(davinci_ks->irq, davinci_ks);
+
+ input_unregister_device(davinci_ks->input);
+
+ iounmap(davinci_ks->base);
+ release_mem_region(davinci_ks->pbase, davinci_ks->base_size);
+
+ kfree(davinci_ks);
+
+ return 0;
+}
+
+static struct platform_driver davinci_ks_driver = {
+ .driver = {
+ .name = "davinci_keyscan",
+ },
+ .remove = davinci_ks_remove,
+};
+
+module_platform_driver_probe(davinci_ks_driver, davinci_ks_probe);
+
+MODULE_AUTHOR("Miguel Aguilar");
+MODULE_DESCRIPTION("Texas Instruments DaVinci Key Scan Driver");
+MODULE_LICENSE("GPL");
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