blob: f2b67dc81d80b92ef186d698737190ff1b4f3fb1 [file] [log] [blame]
/*
* 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");