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kernel/linux-imx6_3.14.28/drivers/hid/hid-appleir.c 9.47 KB
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  /*
   * HID driver for the apple ir device
   *
   * Original driver written by James McKenzie
   * Ported to recent 2.6 kernel versions by Greg Kroah-Hartman <gregkh@suse.de>
   * Updated to support newer remotes by Bastien Nocera <hadess@hadess.net>
   * Ported to HID subsystem by Benjamin Tissoires <benjamin.tissoires@gmail.com>
   *
   * Copyright (C) 2006 James McKenzie
   * Copyright (C) 2008 Greg Kroah-Hartman <greg@kroah.com>
   * Copyright (C) 2008 Novell Inc.
   * Copyright (C) 2010, 2012 Bastien Nocera <hadess@hadess.net>
   * Copyright (C) 2013 Benjamin Tissoires <benjamin.tissoires@gmail.com>
   * Copyright (C) 2013 Red Hat Inc. All Rights Reserved
   *
   * This software is licensed under the terms of the GNU General Public
   * License version 2, as published by the Free Software Foundation, and
   * may be copied, distributed, and modified under those terms.
   *
   * 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.
   */
  
  #include <linux/device.h>
  #include <linux/hid.h>
  #include <linux/module.h>
  #include "hid-ids.h"
  
  MODULE_AUTHOR("James McKenzie");
  MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@redhat.com>");
  MODULE_DESCRIPTION("HID Apple IR remote controls");
  MODULE_LICENSE("GPL");
  
  #define KEY_MASK		0x0F
  #define TWO_PACKETS_MASK	0x40
  
  /*
   * James McKenzie has two devices both of which report the following
   * 25 87 ee 83 0a	+
   * 25 87 ee 83 0c	-
   * 25 87 ee 83 09	<<
   * 25 87 ee 83 06	>>
   * 25 87 ee 83 05	>"
   * 25 87 ee 83 03	menu
   * 26 00 00 00 00	for key repeat
   */
  
  /*
   * Thomas Glanzmann reports the following responses
   * 25 87 ee ca 0b	+
   * 25 87 ee ca 0d	-
   * 25 87 ee ca 08	<<
   * 25 87 ee ca 07	>>
   * 25 87 ee ca 04	>"
   * 25 87 ee ca 02	menu
   * 26 00 00 00 00       for key repeat
   *
   * He also observes the following event sometimes
   * sent after a key is release, which I interpret
   * as a flat battery message
   * 25 87 e0 ca 06	flat battery
   */
  
  /*
   * Alexandre Karpenko reports the following responses for Device ID 0x8242
   * 25 87 ee 47 0b	+
   * 25 87 ee 47 0d	-
   * 25 87 ee 47 08	<<
   * 25 87 ee 47 07	>>
   * 25 87 ee 47 04	>"
   * 25 87 ee 47 02	menu
   * 26 87 ee 47 **	for key repeat (** is the code of the key being held)
   */
  
  /*
   * Bastien Nocera's remote
   * 25 87 ee 91 5f	followed by
   * 25 87 ee 91 05	gives you >"
   *
   * 25 87 ee 91 5c	followed by
   * 25 87 ee 91 05	gives you the middle button
   */
  
  /*
   * Fabien Andre's remote
   * 25 87 ee a3 5e	followed by
   * 25 87 ee a3 04	gives you >"
   *
   * 25 87 ee a3 5d	followed by
   * 25 87 ee a3 04	gives you the middle button
   */
  
  static const unsigned short appleir_key_table[] = {
  	KEY_RESERVED,
  	KEY_MENU,
  	KEY_PLAYPAUSE,
  	KEY_FORWARD,
  	KEY_BACK,
  	KEY_VOLUMEUP,
  	KEY_VOLUMEDOWN,
  	KEY_RESERVED,
  	KEY_RESERVED,
  	KEY_RESERVED,
  	KEY_RESERVED,
  	KEY_RESERVED,
  	KEY_RESERVED,
  	KEY_RESERVED,
  	KEY_ENTER,
  	KEY_PLAYPAUSE,
  	KEY_RESERVED,
  };
  
  struct appleir {
  	struct input_dev *input_dev;
  	struct hid_device *hid;
  	unsigned short keymap[ARRAY_SIZE(appleir_key_table)];
  	struct timer_list key_up_timer;	/* timer for key up */
  	spinlock_t lock;		/* protects .current_key */
  	int current_key;		/* the currently pressed key */
  	int prev_key_idx;		/* key index in a 2 packets message */
  };
  
  static int get_key(int data)
  {
  	/*
  	 * The key is coded accross bits 2..9:
  	 *
  	 * 0x00 or 0x01 (        )	key:  0		-> KEY_RESERVED
  	 * 0x02 or 0x03 (  menu  )	key:  1		-> KEY_MENU
  	 * 0x04 or 0x05 (   >"   )	key:  2		-> KEY_PLAYPAUSE
  	 * 0x06 or 0x07 (   >>   )	key:  3		-> KEY_FORWARD
  	 * 0x08 or 0x09 (   <<   )	key:  4		-> KEY_BACK
  	 * 0x0a or 0x0b (    +   )	key:  5		-> KEY_VOLUMEUP
  	 * 0x0c or 0x0d (    -   )	key:  6		-> KEY_VOLUMEDOWN
  	 * 0x0e or 0x0f (        )	key:  7		-> KEY_RESERVED
  	 * 0x50 or 0x51 (        )	key:  8		-> KEY_RESERVED
  	 * 0x52 or 0x53 (        )	key:  9		-> KEY_RESERVED
  	 * 0x54 or 0x55 (        )	key: 10		-> KEY_RESERVED
  	 * 0x56 or 0x57 (        )	key: 11		-> KEY_RESERVED
  	 * 0x58 or 0x59 (        )	key: 12		-> KEY_RESERVED
  	 * 0x5a or 0x5b (        )	key: 13		-> KEY_RESERVED
  	 * 0x5c or 0x5d ( middle )	key: 14		-> KEY_ENTER
  	 * 0x5e or 0x5f (   >"   )	key: 15		-> KEY_PLAYPAUSE
  	 *
  	 * Packets starting with 0x5 are part of a two-packets message,
  	 * we notify the caller by sending a negative value.
  	 */
  	int key = (data >> 1) & KEY_MASK;
  
  	if ((data & TWO_PACKETS_MASK))
  		/* Part of a 2 packets-command */
  		key = -key;
  
  	return key;
  }
  
  static void key_up(struct hid_device *hid, struct appleir *appleir, int key)
  {
  	input_report_key(appleir->input_dev, key, 0);
  	input_sync(appleir->input_dev);
  }
  
  static void key_down(struct hid_device *hid, struct appleir *appleir, int key)
  {
  	input_report_key(appleir->input_dev, key, 1);
  	input_sync(appleir->input_dev);
  }
  
  static void battery_flat(struct appleir *appleir)
  {
  	dev_err(&appleir->input_dev->dev, "possible flat battery?
  ");
  }
  
  static void key_up_tick(unsigned long data)
  {
  	struct appleir *appleir = (struct appleir *)data;
  	struct hid_device *hid = appleir->hid;
  	unsigned long flags;
  
  	spin_lock_irqsave(&appleir->lock, flags);
  	if (appleir->current_key) {
  		key_up(hid, appleir, appleir->current_key);
  		appleir->current_key = 0;
  	}
  	spin_unlock_irqrestore(&appleir->lock, flags);
  }
  
  static int appleir_raw_event(struct hid_device *hid, struct hid_report *report,
  	 u8 *data, int len)
  {
  	struct appleir *appleir = hid_get_drvdata(hid);
  	static const u8 keydown[] = { 0x25, 0x87, 0xee };
  	static const u8 keyrepeat[] = { 0x26, };
  	static const u8 flatbattery[] = { 0x25, 0x87, 0xe0 };
  	unsigned long flags;
  
  	if (len != 5)
  		goto out;
  
  	if (!memcmp(data, keydown, sizeof(keydown))) {
  		int index;
  
  		spin_lock_irqsave(&appleir->lock, flags);
  		/*
  		 * If we already have a key down, take it up before marking
  		 * this one down
  		 */
  		if (appleir->current_key)
  			key_up(hid, appleir, appleir->current_key);
  
  		/* Handle dual packet commands */
  		if (appleir->prev_key_idx > 0)
  			index = appleir->prev_key_idx;
  		else
  			index = get_key(data[4]);
  
  		if (index >= 0) {
  			appleir->current_key = appleir->keymap[index];
  
  			key_down(hid, appleir, appleir->current_key);
  			/*
  			 * Remote doesn't do key up, either pull them up, in
  			 * the test above, or here set a timer which pulls
  			 * them up after 1/8 s
  			 */
  			mod_timer(&appleir->key_up_timer, jiffies + HZ / 8);
  			appleir->prev_key_idx = 0;
  		} else
  			/* Remember key for next packet */
  			appleir->prev_key_idx = -index;
  		spin_unlock_irqrestore(&appleir->lock, flags);
  		goto out;
  	}
  
  	appleir->prev_key_idx = 0;
  
  	if (!memcmp(data, keyrepeat, sizeof(keyrepeat))) {
  		key_down(hid, appleir, appleir->current_key);
  		/*
  		 * Remote doesn't do key up, either pull them up, in the test
  		 * above, or here set a timer which pulls them up after 1/8 s
  		 */
  		mod_timer(&appleir->key_up_timer, jiffies + HZ / 8);
  		goto out;
  	}
  
  	if (!memcmp(data, flatbattery, sizeof(flatbattery))) {
  		battery_flat(appleir);
  		/* Fall through */
  	}
  
  out:
  	/* let hidraw and hiddev handle the report */
  	return 0;
  }
  
  static void appleir_input_configured(struct hid_device *hid,
  		struct hid_input *hidinput)
  {
  	struct input_dev *input_dev = hidinput->input;
  	struct appleir *appleir = hid_get_drvdata(hid);
  	int i;
  
  	appleir->input_dev = input_dev;
  
  	input_dev->keycode = appleir->keymap;
  	input_dev->keycodesize = sizeof(unsigned short);
  	input_dev->keycodemax = ARRAY_SIZE(appleir->keymap);
  
  	input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_REP);
  
  	memcpy(appleir->keymap, appleir_key_table, sizeof(appleir->keymap));
  	for (i = 0; i < ARRAY_SIZE(appleir_key_table); i++)
  		set_bit(appleir->keymap[i], input_dev->keybit);
  	clear_bit(KEY_RESERVED, input_dev->keybit);
  }
  
  static int appleir_input_mapping(struct hid_device *hid,
  		struct hid_input *hi, struct hid_field *field,
  		struct hid_usage *usage, unsigned long **bit, int *max)
  {
  	return -1;
  }
  
  static int appleir_probe(struct hid_device *hid, const struct hid_device_id *id)
  {
  	int ret;
  	struct appleir *appleir;
  
  	appleir = kzalloc(sizeof(struct appleir), GFP_KERNEL);
  	if (!appleir) {
  		ret = -ENOMEM;
  		goto allocfail;
  	}
  
  	appleir->hid = hid;
  
  	/* force input as some remotes bypass the input registration */
  	hid->quirks |= HID_QUIRK_HIDINPUT_FORCE;
  
  	spin_lock_init(&appleir->lock);
  	setup_timer(&appleir->key_up_timer,
  		    key_up_tick, (unsigned long) appleir);
  
  	hid_set_drvdata(hid, appleir);
  
  	ret = hid_parse(hid);
  	if (ret) {
  		hid_err(hid, "parse failed
  ");
  		goto fail;
  	}
  
  	ret = hid_hw_start(hid, HID_CONNECT_DEFAULT | HID_CONNECT_HIDDEV_FORCE);
  	if (ret) {
  		hid_err(hid, "hw start failed
  ");
  		goto fail;
  	}
  
  	return 0;
  fail:
  	kfree(appleir);
  allocfail:
  	return ret;
  }
  
  static void appleir_remove(struct hid_device *hid)
  {
  	struct appleir *appleir = hid_get_drvdata(hid);
  	hid_hw_stop(hid);
  	del_timer_sync(&appleir->key_up_timer);
  	kfree(appleir);
  }
  
  static const struct hid_device_id appleir_devices[] = {
  	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_IRCONTROL) },
  	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_IRCONTROL2) },
  	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_IRCONTROL3) },
  	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_IRCONTROL4) },
  	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_IRCONTROL5) },
  	{ }
  };
  MODULE_DEVICE_TABLE(hid, appleir_devices);
  
  static struct hid_driver appleir_driver = {
  	.name = "appleir",
  	.id_table = appleir_devices,
  	.raw_event = appleir_raw_event,
  	.input_configured = appleir_input_configured,
  	.probe = appleir_probe,
  	.remove = appleir_remove,
  	.input_mapping = appleir_input_mapping,
  };
  module_hid_driver(appleir_driver);