From: Miguel Aguilar <miguel.aguilar@xxxxxxxxxxxx>
Adds the driver for enabling key scan support for DaVinci platforms.
DM365 is the only platform that uses this driver at the moment.
Signed-off-by: Miguel Aguilar <miguel.aguilar@xxxxxxxxxxxx>
---
arch/arm/mach-davinci/include/mach/keyscan.h | 35 +++
drivers/input/keyboard/Kconfig | 10 +
drivers/input/keyboard/Makefile | 1 +
drivers/input/keyboard/davinci_keyscan.c | 326 ++++++++++++++++++++++++++
4 files changed, 372 insertions(+), 0 deletions(-)
create mode 100644 arch/arm/mach-davinci/include/mach/keyscan.h
create mode 100644 drivers/input/keyboard/davinci_keyscan.c
diff --git a/arch/arm/mach-davinci/include/mach/keyscan.h b/arch/arm/mach-davinci/include/mach/keyscan.h
new file mode 100644
index 0000000..6d64198
--- /dev/null
+++ b/arch/arm/mach-davinci/include/mach/keyscan.h
@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2009 Texas Instruments, Inc
+ *
+ * Author: Miguel Aguilar <miguel.aguilar@xxxxxxxxxxxx>
+ *
+ * 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
+ */
+
+#ifndef DAVINCI_KEYSCAN_H
+#define DAVINCI_KEYSCAN_H
+
+#include <linux/io.h>
+
+struct davinci_ks_platform_data {
+ unsigned short *keymap;
+ u32 keymapsize;
+ u32 rep:1;
+ u32 strobe;
+ u32 interval;
+};
+
+#endif
+
diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
index a6b989a..72e560e 100644
--- a/drivers/input/keyboard/Kconfig
+++ b/drivers/input/keyboard/Kconfig
@@ -361,4 +361,14 @@ config KEYBOARD_XTKBD
To compile this driver as a module, choose M here: the
module will be called xtkbd.
+config KEYBOARD_DAVINCI
+ tristate "TI DaVinci Key Scan"
+ depends on ARCH_DAVINCI_DM365
+ help
+ Say Y to enable keypad module support for the TI DaVinci
+ platforms (DM365)
+
+ To compile this driver as a module, choose M here: the
+ module will be called davinci_keyscan.
+
endif
diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile
index b5b5eae..28e42b6 100644
--- a/drivers/input/keyboard/Makefile
+++ b/drivers/input/keyboard/Makefile
@@ -31,3 +31,4 @@ obj-$(CONFIG_KEYBOARD_STOWAWAY) += stowaway.o
obj-$(CONFIG_KEYBOARD_SUNKBD) += sunkbd.o
obj-$(CONFIG_KEYBOARD_TOSA) += tosakbd.o
obj-$(CONFIG_KEYBOARD_XTKBD) += xtkbd.o
+obj-$(CONFIG_KEYBOARD_DAVINCI) += davinci_keyscan.o
diff --git a/drivers/input/keyboard/davinci_keyscan.c b/drivers/input/keyboard/davinci_keyscan.c
new file mode 100644
index 0000000..074cf81
--- /dev/null
+++ b/drivers/input/keyboard/davinci_keyscan.c
@@ -0,0 +1,326 @@
+/*
+ * DaVinci Key Scan Driver for TI platforms
+ *
+ * Copyright (C) 2009 Texas Instruments, Inc
+ *
+ * Author: Miguel Aguilar <miguel.aguilar@xxxxxxxxxxxx>
+ *
+ * Intial Code: Sandeep Paulraj <s-paulraj@xxxxxx>
+ *
+ * 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 <asm/irq.h>
+
+#include <mach/hardware.h>
+#include <mach/irqs.h>
+#include <mach/keyscan.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
+#define DAVINCI_KEYSCAN_4X4 0x00000040
+
+/* 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[];
+};
+
+static void davinci_ks_write(struct davinci_ks *davinci_ks, u32 val, u32 addr)
+{
+ u32 base = (u32)davinci_ks->base;
+
+ __raw_writel(val,(u32 *)(base + addr));
+}
+
+static u32 davinci_ks_read(struct davinci_ks *davinci_ks, u32 addr)
+{
+ u32 base = (u32)davinci_ks->base;
+
+ return __raw_readl((u32 *)(base + addr));
+}
+
+/* Initializing the kp Module */
+static void davinci_ks_initialize(struct davinci_ks *davinci_ks)
+{
+ u32 strobe = davinci_ks->pdata->strobe;
+ u32 interval = davinci_ks->pdata->interval;
+
+ /* Enable all interrupts */
+ davinci_ks_write(davinci_ks, DAVINCI_KEYSCAN_INT_ALL, DAVINCI_KEYSCAN_INTENA);
+
+ /* Clear interrupts if any */
+ davinci_ks_write(davinci_ks, DAVINCI_KEYSCAN_INT_ALL, DAVINCI_KEYSCAN_INTCLR);
+
+ /* Setup the scan period = strobe + interval */
+ davinci_ks_write(davinci_ks, strobe, DAVINCI_KEYSCAN_STRBWIDTH);
+ davinci_ks_write(davinci_ks, interval, DAVINCI_KEYSCAN_INTERVAL);
+ davinci_ks_write(davinci_ks, 0x01, DAVINCI_KEYSCAN_CONTTIME);
+
+ /* Enable Keyscan module and enable */
+ davinci_ks_write(davinci_ks, DAVINCI_KEYSCAN_AUTODET | DAVINCI_KEYSCAN_KEYEN,
+ DAVINCI_KEYSCAN_KEYCTRL);
+}
+
+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 */
+ davinci_ks_write(davinci_ks, 0x0, DAVINCI_KEYSCAN_INTENA);
+
+ /* Reading previous and new status of the key scan */
+ prev_status = davinci_ks_read(davinci_ks, DAVINCI_KEYSCAN_PREVSTATE);
+ new_status = davinci_ks_read(davinci_ks, DAVINCI_KEYSCAN_CURRENTST);
+
+ changed = prev_status ^ new_status;
+
+ if(changed) {
+ /*
+ * It goes go 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_info(dev, "davinci_keyscan: key %d %s\n",
+ keycode, release ? "released" : "pressed");
+ input_report_key(davinci_ks->input, keycode,
+ !release);
+ input_sync(davinci_ks->input);
+ }
+ }
+ /* Clearing interrupt */
+ davinci_ks_write(davinci_ks, DAVINCI_KEYSCAN_INT_ALL,
+ DAVINCI_KEYSCAN_INTCLR);
+ }
+
+ /* Enable interrupts */
+ davinci_ks_write(davinci_ks, 0x1, 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 = pdev->dev.platform_data;
+ int ret, i;
+
+ dev_info(dev, "DaVinci Key Scan Driver\n");
+
+ 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;
+ }
+
+ if (!pdata->keymap) {
+ dev_dbg(dev, "no keymap from pdata\n");
+ return -EINVAL;
+ }
+
+ 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");
+ ret = -ENOMEM;
+ goto fail1;
+ }
+
+ platform_set_drvdata(pdev, davinci_ks);
+
+ 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");
+ ret = davinci_ks->irq;
+ goto fail2;
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(dev, "no mem resource\n");
+ ret = -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);
+ ret = -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");
+ ret = -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;
+
+ ret = input_register_device(davinci_ks->input);
+ if (ret < 0) {
+ dev_err(dev, "unable to register DaVinci keyscan device\n");
+ goto fail4;
+ }
+
+ ret = request_irq(davinci_ks->irq, davinci_ks_interrupt, IRQF_DISABLED,
+ "davinci_keyscan", davinci_ks);
+ if (ret < 0) {
+ dev_err(dev, "unable to register DaVinci keyscan Interrupt\n");
+ goto fail5;
+ }
+
+ davinci_ks_initialize(davinci_ks);
+
+ return 0;
+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 ret;
+}
+
+static int __devexit 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);
+
+ platform_set_drvdata(pdev, NULL);
+
+ kfree(davinci_ks);
+
+ return 0;
+}
+
+static struct platform_driver davinci_ks_driver = {
+ .driver = {
+ .name = "davinci_keyscan",
+ .owner = THIS_MODULE,
+ },
+ .remove = __devexit_p(davinci_ks_remove),
+};
+
+static int __init davinci_ks_init(void)
+{
+ return platform_driver_probe(&davinci_ks_driver, davinci_ks_probe);
+}
+module_init(davinci_ks_init);
+
+static void __exit davinci_ks_exit(void)
+{
+ platform_driver_unregister(&davinci_ks_driver);
+}
+module_exit(davinci_ks_exit);
+
+MODULE_AUTHOR("Miguel Aguilar");
+MODULE_DESCRIPTION("Texas Instruments DaVinci Key Scan Driver");
+MODULE_LICENSE("GPL");
--
1.6.0.4
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