drivers/input/misc/dm355evm_keys.c - kernel/prism - Git at Google

 /*
  * dm355evm_keys.c - support buttons and IR remote on DM355 EVM board
  *
  * Copyright (c) 2008 by David Brownell
  *
  * 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.
  */
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/input.h>
 #include <linux/platform_device.h>
 #include <linux/interrupt.h>

 #include <linux/i2c/dm355evm_msp.h>


 /*
  * The MSP430 firmware on the DM355 EVM monitors on-board pushbuttons
  * and an IR receptor used for the remote control.  When any key is
  * pressed, or its autorepeat kicks in, an event is sent.  This driver
  * read those events from the small (32 event) queue and reports them.
  *
  * Note that physically there can only be one of these devices.
  *
  * This driver was tested with firmware revision A4.
  */
 struct dm355evm_keys {
 	struct input_dev	*input;
 	struct device		*dev;
 	int			irq;
 };

 /* These initial keycodes can be remapped by dm355evm_setkeycode(). */
 static struct {
 	u16	event;
 	u16	keycode;
 } dm355evm_keys[] = {

 	/*
 	 * Pushbuttons on the EVM board ... note that the labels for these
 	 * are SW10/SW11/etc on the PC board.  The left/right orientation
 	 * comes only from the firmware's documentation, and presumes the
 	 * power connector is immediately in front of you and the IR sensor
 	 * is to the right.  (That is, rotate the board counter-clockwise
 	 * by 90 degrees from the SW10/etc and "DM355 EVM" labels.)
 	 */
 	{ 0x00d8, KEY_OK, },		/* SW12 */
 	{ 0x00b8, KEY_UP, },		/* SW13 */
 	{ 0x00e8, KEY_DOWN, },		/* SW11 */
 	{ 0x0078, KEY_LEFT, },		/* SW14 */
 	{ 0x00f0, KEY_RIGHT, },		/* SW10 */

 	/*
 	 * IR buttons ... codes assigned to match the universal remote
 	 * provided with the EVM (Philips PM4S) using DVD code 0020.
 	 *
 	 * These event codes match firmware documentation, but other
 	 * remote controls could easily send more RC5-encoded events.
 	 * The PM4S manual was used in several cases to help select
 	 * a keycode reflecting the intended usage.
 	 *
 	 * RC5 codes are 14 bits, with two start bits (0x3 prefix)
 	 * and a toggle bit (masked out below).
 	 */
 	{ 0x300c, KEY_POWER, },		/* NOTE: docs omit this */
 	{ 0x3000, KEY_NUMERIC_0, },
 	{ 0x3001, KEY_NUMERIC_1, },
 	{ 0x3002, KEY_NUMERIC_2, },
 	{ 0x3003, KEY_NUMERIC_3, },
 	{ 0x3004, KEY_NUMERIC_4, },
 	{ 0x3005, KEY_NUMERIC_5, },
 	{ 0x3006, KEY_NUMERIC_6, },
 	{ 0x3007, KEY_NUMERIC_7, },
 	{ 0x3008, KEY_NUMERIC_8, },
 	{ 0x3009, KEY_NUMERIC_9, },
 	{ 0x3022, KEY_ENTER, },
 	{ 0x30ec, KEY_MODE, },		/* "tv/vcr/..." */
 	{ 0x300f, KEY_SELECT, },	/* "info" */
 	{ 0x3020, KEY_CHANNELUP, },	/* "up" */
 	{ 0x302e, KEY_MENU, },		/* "in/out" */
 	{ 0x3011, KEY_VOLUMEDOWN, },	/* "left" */
 	{ 0x300d, KEY_MUTE, },		/* "ok" */
 	{ 0x3010, KEY_VOLUMEUP, },	/* "right" */
 	{ 0x301e, KEY_SUBTITLE, },	/* "cc" */
 	{ 0x3021, KEY_CHANNELDOWN, },	/* "down" */
 	{ 0x3022, KEY_PREVIOUS, },
 	{ 0x3026, KEY_SLEEP, },
 	{ 0x3172, KEY_REWIND, },	/* NOTE: docs wrongly say 0x30ca */
 	{ 0x3175, KEY_PLAY, },
 	{ 0x3174, KEY_FASTFORWARD, },
 	{ 0x3177, KEY_RECORD, },
 	{ 0x3176, KEY_STOP, },
 	{ 0x3169, KEY_PAUSE, },
 };

 /*
  * Because we communicate with the MSP430 using I2C, and all I2C calls
  * in Linux sleep, we use a threaded IRQ handler.  The IRQ itself is
  * active low, but we go through the GPIO controller so we can trigger
  * on falling edges and not worry about enabling/disabling the IRQ in
  * the keypress handling path.
  */
 static irqreturn_t dm355evm_keys_irq(int irq, void *_keys)
 {
 	struct dm355evm_keys	*keys = _keys;
 	int			status;

 	/* For simplicity we ignore INPUT_COUNT and just read
 	 * events until we get the "queue empty" indicator.
 	 * Reading INPUT_LOW decrements the count.
 	 */
 	for (;;) {
 		static u16	last_event;
 		u16		event;
 		int		keycode;
 		int		i;

 		status = dm355evm_msp_read(DM355EVM_MSP_INPUT_HIGH);
 		if (status < 0) {
 			dev_dbg(keys->dev, "input high err %d\n",
 					status);
 			break;
 		}
 		event = status << 8;

 		status = dm355evm_msp_read(DM355EVM_MSP_INPUT_LOW);
 		if (status < 0) {
 			dev_dbg(keys->dev, "input low err %d\n",
 					status);
 			break;
 		}
 		event |= status;
 		if (event == 0xdead)
 			break;

 		/* Press and release a button:  two events, same code.
 		 * Press and hold (autorepeat), then release: N events
 		 * (N > 2), same code.  For RC5 buttons the toggle bits
 		 * distinguish (for example) "1-autorepeat" from "1 1";
 		 * but PCB buttons don't support that bit.
 		 *
 		 * So we must synthesize release events.  We do that by
 		 * mapping events to a press/release event pair; then
 		 * to avoid adding extra events, skip the second event
 		 * of each pair.
 		 */
 		if (event == last_event) {
 			last_event = 0;
 			continue;
 		}
 		last_event = event;

 		/* ignore the RC5 toggle bit */
 		event &= ~0x0800;

 		/* find the key, or leave it as unknown */
 		keycode = KEY_UNKNOWN;
 		for (i = 0; i < ARRAY_SIZE(dm355evm_keys); i++) {
 			if (dm355evm_keys[i].event != event)
 				continue;
 			keycode = dm355evm_keys[i].keycode;
 			break;
 		}
 		dev_dbg(keys->dev,
 			"input event 0x%04x--> keycode %d\n",
 			event, keycode);

 		/* report press + release */
 		input_report_key(keys->input, keycode, 1);
 		input_sync(keys->input);
 		input_report_key(keys->input, keycode, 0);
 		input_sync(keys->input);
 	}
 	return IRQ_HANDLED;
 }

 static int dm355evm_setkeycode(struct input_dev *dev, int index, int keycode)
 {
 	u16		old_keycode;
 	unsigned	i;

 	if (((unsigned)index) >= ARRAY_SIZE(dm355evm_keys))
 		return -EINVAL;

 	old_keycode = dm355evm_keys[index].keycode;
 	dm355evm_keys[index].keycode = keycode;
 	set_bit(keycode, dev->keybit);

 	for (i = 0; i < ARRAY_SIZE(dm355evm_keys); i++) {
 		if (dm355evm_keys[index].keycode == old_keycode)
 			goto done;
 	}
 	clear_bit(old_keycode, dev->keybit);
 done:
 	return 0;
 }

 static int dm355evm_getkeycode(struct input_dev *dev, int index, int *keycode)
 {
 	if (((unsigned)index) >= ARRAY_SIZE(dm355evm_keys))
 		return -EINVAL;

 	return dm355evm_keys[index].keycode;
 }

 /*----------------------------------------------------------------------*/

 static int __devinit dm355evm_keys_probe(struct platform_device *pdev)
 {
 	struct dm355evm_keys	*keys;
 	struct input_dev	*input;
 	int			status;
 	int			i;

 	/* allocate instance struct and input dev */
 	keys = kzalloc(sizeof *keys, GFP_KERNEL);
 	input = input_allocate_device();
 	if (!keys || !input) {
 		status = -ENOMEM;
 		goto fail1;
 	}

 	keys->dev = &pdev->dev;
 	keys->input = input;

 	/* set up "threaded IRQ handler" */
 	status = platform_get_irq(pdev, 0);
 	if (status < 0)
 		goto fail1;
 	keys->irq = status;

 	input_set_drvdata(input, keys);

 	input->name = "DM355 EVM Controls";
 	input->phys = "dm355evm/input0";
 	input->dev.parent = &pdev->dev;

 	input->id.bustype = BUS_I2C;
 	input->id.product = 0x0355;
 	input->id.version = dm355evm_msp_read(DM355EVM_MSP_FIRMREV);

 	input->evbit[0] = BIT(EV_KEY);
 	for (i = 0; i < ARRAY_SIZE(dm355evm_keys); i++)
 		__set_bit(dm355evm_keys[i].keycode, input->keybit);

 	input->setkeycode = dm355evm_setkeycode;
 	input->getkeycode = dm355evm_getkeycode;

 	/* REVISIT:  flush the event queue? */

 	status = request_threaded_irq(keys->irq, NULL, dm355evm_keys_irq,
 			IRQF_TRIGGER_FALLING, dev_name(&pdev->dev), keys);
 	if (status < 0)
 		goto fail1;

 	/* register */
 	status = input_register_device(input);
 	if (status < 0)
 		goto fail2;

 	platform_set_drvdata(pdev, keys);

 	return 0;

 fail2:
 	free_irq(keys->irq, keys);
 fail1:
 	input_free_device(input);
 	kfree(keys);
 	dev_err(&pdev->dev, "can't register, err %d\n", status);

 	return status;
 }

 static int __devexit dm355evm_keys_remove(struct platform_device *pdev)
 {
 	struct dm355evm_keys	*keys = platform_get_drvdata(pdev);

 	free_irq(keys->irq, keys);
 	input_unregister_device(keys->input);
 	kfree(keys);

 	return 0;
 }

 /* REVISIT:  add suspend/resume when DaVinci supports it.  The IRQ should
  * be able to wake up the system.  When device_may_wakeup(&pdev->dev), call
  * enable_irq_wake() on suspend, and disable_irq_wake() on resume.
  */

 /*
  * I2C is used to talk to the MSP430, but this platform device is
  * exposed by an MFD driver that manages I2C communications.
  */
 static struct platform_driver dm355evm_keys_driver = {
 	.probe		= dm355evm_keys_probe,
 	.remove		= __devexit_p(dm355evm_keys_remove),
 	.driver		= {
 		.owner	= THIS_MODULE,
 		.name	= "dm355evm_keys",
 	},
 };

 static int __init dm355evm_keys_init(void)
 {
 	return platform_driver_register(&dm355evm_keys_driver);
 }
 module_init(dm355evm_keys_init);

 static void __exit dm355evm_keys_exit(void)
 {
 	platform_driver_unregister(&dm355evm_keys_driver);
 }
 module_exit(dm355evm_keys_exit);

 MODULE_LICENSE("GPL");
	/*
	* dm355evm_keys.c - support buttons and IR remote on DM355 EVM board
	*
	* Copyright (c) 2008 by David Brownell
	*
	* 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.
	*/
	#include <linux/kernel.h>
	#include <linux/init.h>
	#include <linux/input.h>
	#include <linux/platform_device.h>
	#include <linux/interrupt.h>

	#include <linux/i2c/dm355evm_msp.h>


	/*
	* The MSP430 firmware on the DM355 EVM monitors on-board pushbuttons
	* and an IR receptor used for the remote control. When any key is
	* pressed, or its autorepeat kicks in, an event is sent. This driver
	* read those events from the small (32 event) queue and reports them.
	*
	* Note that physically there can only be one of these devices.
	*
	* This driver was tested with firmware revision A4.
	*/
	struct dm355evm_keys {
	struct input_dev *input;
	struct device *dev;
	int irq;
	};

	/* These initial keycodes can be remapped by dm355evm_setkeycode(). */
	static struct {
	u16 event;
	u16 keycode;
	} dm355evm_keys[] = {

	/*
	* Pushbuttons on the EVM board ... note that the labels for these
	* are SW10/SW11/etc on the PC board. The left/right orientation
	* comes only from the firmware's documentation, and presumes the
	* power connector is immediately in front of you and the IR sensor
	* is to the right. (That is, rotate the board counter-clockwise
	* by 90 degrees from the SW10/etc and "DM355 EVM" labels.)
	*/
	{ 0x00d8, KEY_OK, }, /* SW12 */
	{ 0x00b8, KEY_UP, }, /* SW13 */
	{ 0x00e8, KEY_DOWN, }, /* SW11 */
	{ 0x0078, KEY_LEFT, }, /* SW14 */
	{ 0x00f0, KEY_RIGHT, }, /* SW10 */

	/*
	* IR buttons ... codes assigned to match the universal remote
	* provided with the EVM (Philips PM4S) using DVD code 0020.
	*
	* These event codes match firmware documentation, but other
	* remote controls could easily send more RC5-encoded events.
	* The PM4S manual was used in several cases to help select
	* a keycode reflecting the intended usage.
	*
	* RC5 codes are 14 bits, with two start bits (0x3 prefix)
	* and a toggle bit (masked out below).
	*/
	{ 0x300c, KEY_POWER, }, /* NOTE: docs omit this */
	{ 0x3000, KEY_NUMERIC_0, },
	{ 0x3001, KEY_NUMERIC_1, },
	{ 0x3002, KEY_NUMERIC_2, },
	{ 0x3003, KEY_NUMERIC_3, },
	{ 0x3004, KEY_NUMERIC_4, },
	{ 0x3005, KEY_NUMERIC_5, },
	{ 0x3006, KEY_NUMERIC_6, },
	{ 0x3007, KEY_NUMERIC_7, },
	{ 0x3008, KEY_NUMERIC_8, },
	{ 0x3009, KEY_NUMERIC_9, },
	{ 0x3022, KEY_ENTER, },
	{ 0x30ec, KEY_MODE, }, /* "tv/vcr/..." */
	{ 0x300f, KEY_SELECT, }, /* "info" */
	{ 0x3020, KEY_CHANNELUP, }, /* "up" */
	{ 0x302e, KEY_MENU, }, /* "in/out" */
	{ 0x3011, KEY_VOLUMEDOWN, }, /* "left" */
	{ 0x300d, KEY_MUTE, }, /* "ok" */
	{ 0x3010, KEY_VOLUMEUP, }, /* "right" */
	{ 0x301e, KEY_SUBTITLE, }, /* "cc" */
	{ 0x3021, KEY_CHANNELDOWN, }, /* "down" */
	{ 0x3022, KEY_PREVIOUS, },
	{ 0x3026, KEY_SLEEP, },
	{ 0x3172, KEY_REWIND, }, /* NOTE: docs wrongly say 0x30ca */
	{ 0x3175, KEY_PLAY, },
	{ 0x3174, KEY_FASTFORWARD, },
	{ 0x3177, KEY_RECORD, },
	{ 0x3176, KEY_STOP, },
	{ 0x3169, KEY_PAUSE, },
	};

	/*
	* Because we communicate with the MSP430 using I2C, and all I2C calls
	* in Linux sleep, we use a threaded IRQ handler. The IRQ itself is
	* active low, but we go through the GPIO controller so we can trigger
	* on falling edges and not worry about enabling/disabling the IRQ in
	* the keypress handling path.
	*/
	static irqreturn_t dm355evm_keys_irq(int irq, void *_keys)
	{
	struct dm355evm_keys *keys = _keys;
	int status;

	/* For simplicity we ignore INPUT_COUNT and just read
	* events until we get the "queue empty" indicator.
	* Reading INPUT_LOW decrements the count.
	*/
	for (;;) {
	static u16 last_event;
	u16 event;
	int keycode;
	int i;

	status = dm355evm_msp_read(DM355EVM_MSP_INPUT_HIGH);
	if (status < 0) {
	dev_dbg(keys->dev, "input high err %d\n",
	status);
	break;
	}
	event = status << 8;

	status = dm355evm_msp_read(DM355EVM_MSP_INPUT_LOW);
	if (status < 0) {
	dev_dbg(keys->dev, "input low err %d\n",
	status);
	break;
	}
	event \|= status;
	if (event == 0xdead)
	break;

	/* Press and release a button: two events, same code.
	* Press and hold (autorepeat), then release: N events
	* (N > 2), same code. For RC5 buttons the toggle bits
	* distinguish (for example) "1-autorepeat" from "1 1";
	* but PCB buttons don't support that bit.
	*
	* So we must synthesize release events. We do that by
	* mapping events to a press/release event pair; then
	* to avoid adding extra events, skip the second event
	* of each pair.
	*/
	if (event == last_event) {
	last_event = 0;
	continue;
	}
	last_event = event;

	/* ignore the RC5 toggle bit */
	event &= ~0x0800;

	/* find the key, or leave it as unknown */
	keycode = KEY_UNKNOWN;
	for (i = 0; i < ARRAY_SIZE(dm355evm_keys); i++) {
	if (dm355evm_keys[i].event != event)
	continue;
	keycode = dm355evm_keys[i].keycode;
	break;
	}
	dev_dbg(keys->dev,
	"input event 0x%04x--> keycode %d\n",
	event, keycode);

	/* report press + release */
	input_report_key(keys->input, keycode, 1);
	input_sync(keys->input);
	input_report_key(keys->input, keycode, 0);
	input_sync(keys->input);
	}
	return IRQ_HANDLED;
	}

	static int dm355evm_setkeycode(struct input_dev *dev, int index, int keycode)
	{
	u16 old_keycode;
	unsigned i;

	if (((unsigned)index) >= ARRAY_SIZE(dm355evm_keys))
	return -EINVAL;

	old_keycode = dm355evm_keys[index].keycode;
	dm355evm_keys[index].keycode = keycode;
	set_bit(keycode, dev->keybit);

	for (i = 0; i < ARRAY_SIZE(dm355evm_keys); i++) {
	if (dm355evm_keys[index].keycode == old_keycode)
	goto done;
	}
	clear_bit(old_keycode, dev->keybit);
	done:
	return 0;
	}

	static int dm355evm_getkeycode(struct input_dev dev, int index, int keycode)
	{
	if (((unsigned)index) >= ARRAY_SIZE(dm355evm_keys))
	return -EINVAL;

	return dm355evm_keys[index].keycode;
	}

	/----------------------------------------------------------------------/

	static int __devinit dm355evm_keys_probe(struct platform_device *pdev)
	{
	struct dm355evm_keys *keys;
	struct input_dev *input;
	int status;
	int i;

	/* allocate instance struct and input dev */
	keys = kzalloc(sizeof *keys, GFP_KERNEL);
	input = input_allocate_device();
	if (!keys \|\| !input) {
	status = -ENOMEM;
	goto fail1;
	}

	keys->dev = &pdev->dev;
	keys->input = input;

	/* set up "threaded IRQ handler" */
	status = platform_get_irq(pdev, 0);
	if (status < 0)
	goto fail1;
	keys->irq = status;

	input_set_drvdata(input, keys);

	input->name = "DM355 EVM Controls";
	input->phys = "dm355evm/input0";
	input->dev.parent = &pdev->dev;

	input->id.bustype = BUS_I2C;
	input->id.product = 0x0355;
	input->id.version = dm355evm_msp_read(DM355EVM_MSP_FIRMREV);

	input->evbit[0] = BIT(EV_KEY);
	for (i = 0; i < ARRAY_SIZE(dm355evm_keys); i++)
	__set_bit(dm355evm_keys[i].keycode, input->keybit);

	input->setkeycode = dm355evm_setkeycode;
	input->getkeycode = dm355evm_getkeycode;

	/* REVISIT: flush the event queue? */

	status = request_threaded_irq(keys->irq, NULL, dm355evm_keys_irq,
	IRQF_TRIGGER_FALLING, dev_name(&pdev->dev), keys);
	if (status < 0)
	goto fail1;

	/* register */
	status = input_register_device(input);
	if (status < 0)
	goto fail2;

	platform_set_drvdata(pdev, keys);

	return 0;

	fail2:
	free_irq(keys->irq, keys);
	fail1:
	input_free_device(input);
	kfree(keys);
	dev_err(&pdev->dev, "can't register, err %d\n", status);

	return status;
	}

	static int __devexit dm355evm_keys_remove(struct platform_device *pdev)
	{
	struct dm355evm_keys *keys = platform_get_drvdata(pdev);

	free_irq(keys->irq, keys);
	input_unregister_device(keys->input);
	kfree(keys);

	return 0;
	}

	/* REVISIT: add suspend/resume when DaVinci supports it. The IRQ should
	* be able to wake up the system. When device_may_wakeup(&pdev->dev), call
	* enable_irq_wake() on suspend, and disable_irq_wake() on resume.
	*/

	/*
	* I2C is used to talk to the MSP430, but this platform device is
	* exposed by an MFD driver that manages I2C communications.
	*/
	static struct platform_driver dm355evm_keys_driver = {
	.probe = dm355evm_keys_probe,
	.remove = __devexit_p(dm355evm_keys_remove),
	.driver = {
	.owner = THIS_MODULE,
	.name = "dm355evm_keys",
	},
	};

	static int __init dm355evm_keys_init(void)
	{
	return platform_driver_register(&dm355evm_keys_driver);
	}
	module_init(dm355evm_keys_init);

	static void __exit dm355evm_keys_exit(void)
	{
	platform_driver_unregister(&dm355evm_keys_driver);
	}
	module_exit(dm355evm_keys_exit);

	MODULE_LICENSE("GPL");