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linux/drivers/hid/hid-appleir.c
Dmitry Torokhov 9154301a47 HID: hid-input: allow input_configured callback return errors 
When configuring input device via input_configured callback we may
encounter errors (for example input_mt_init_slots() may fail). Instead
of continuing with half-initialized input device let's allow driver
indicate failures.

Signed-off-by: Jaikumar Ganesh <jaikumarg@android.com>
Signed-off-by: Arve Hjønnevåg <arve@android.com>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Reviewed-by: David Herrmann <dh.herrmann@gmail.com>
Acked-by: Nikolai Kondrashov <Nikolai.Kondrashov@redhat.com>
Acked-by: Andrew Duggan <aduggan@synaptics.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2015-11-05 09:51:50 -08:00

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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?\n");
}
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 int 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);
return 0;
}
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\n");
goto fail;
}
ret = hid_hw_start(hid, HID_CONNECT_DEFAULT | HID_CONNECT_HIDDEV_FORCE);
if (ret) {
hid_err(hid, "hw start failed\n");
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);
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