Input: add DaVinci Keypad Driver (bc09dcad) · Commits · e / devices / android_kernel_oneplus_sm7250

arch/arm/mach-davinci/include/mach/keyscan.h

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		/*
		* Copyright (C) 2009 Texas Instruments, Inc
		*
		* Author: Miguel Aguilar <miguel.aguilar@ridgerun.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
		*/

		#ifndef DAVINCI_KEYSCAN_H
		#define DAVINCI_KEYSCAN_H

		#include <linux/io.h>

		enum davinci_matrix_types {
		DAVINCI_KEYSCAN_MATRIX_4X4,
		DAVINCI_KEYSCAN_MATRIX_5X3,
		};

		struct davinci_ks_platform_data {
		unsigned short *keymap;
		u32 keymapsize;
		u8 rep:1;
		u8 strobe;
		u8 interval;
		u8 matrix_type;
		};

		#endif

drivers/input/keyboard/Kconfig

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		@@ -361,6 +361,16 @@ config KEYBOARD_SH_KEYSC
		To compile this driver as a module, choose M here: the
		module will be called sh_keysc.

		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.

		config KEYBOARD_OMAP
		tristate "TI OMAP keypad support"
		depends on (ARCH_OMAP1 \|\| ARCH_OMAP2)

drivers/input/keyboard/Makefile

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		@@ -11,6 +11,7 @@ obj-$(CONFIG_KEYBOARD_ATARI) += atakbd.o
		obj-$(CONFIG_KEYBOARD_ATKBD) += atkbd.o
		obj-$(CONFIG_KEYBOARD_BFIN) += bf54x-keys.o
		obj-$(CONFIG_KEYBOARD_CORGI) += corgikbd.o
		obj-$(CONFIG_KEYBOARD_DAVINCI) += davinci_keyscan.o
		obj-$(CONFIG_KEYBOARD_EP93XX) += ep93xx_keypad.o
		obj-$(CONFIG_KEYBOARD_GPIO) += gpio_keys.o
		obj-$(CONFIG_KEYBOARD_HIL) += hil_kbd.o

drivers/input/keyboard/davinci_keyscan.c

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		/*
		* DaVinci Key Scan Driver for TI platforms
		*
		* Copyright (C) 2009 Texas Instruments, Inc
		*
		* Author: Miguel Aguilar <miguel.aguilar@ridgerun.com>
		*
		* Intial 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 <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

		/* 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 = pdev->dev.platform_data;
		int error, i;

		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,
		IRQF_DISABLED, 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 __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");