282 строки
8.1 KiB
C
282 строки
8.1 KiB
C
/*
|
|
* 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/input/sparse-keymap.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 */
|
|
static const struct key_entry 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.)
|
|
*/
|
|
{ KE_KEY, 0x00d8, { KEY_OK } }, /* SW12 */
|
|
{ KE_KEY, 0x00b8, { KEY_UP } }, /* SW13 */
|
|
{ KE_KEY, 0x00e8, { KEY_DOWN } }, /* SW11 */
|
|
{ KE_KEY, 0x0078, { KEY_LEFT } }, /* SW14 */
|
|
{ KE_KEY, 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).
|
|
*/
|
|
{ KE_KEY, 0x300c, { KEY_POWER } }, /* NOTE: docs omit this */
|
|
{ KE_KEY, 0x3000, { KEY_NUMERIC_0 } },
|
|
{ KE_KEY, 0x3001, { KEY_NUMERIC_1 } },
|
|
{ KE_KEY, 0x3002, { KEY_NUMERIC_2 } },
|
|
{ KE_KEY, 0x3003, { KEY_NUMERIC_3 } },
|
|
{ KE_KEY, 0x3004, { KEY_NUMERIC_4 } },
|
|
{ KE_KEY, 0x3005, { KEY_NUMERIC_5 } },
|
|
{ KE_KEY, 0x3006, { KEY_NUMERIC_6 } },
|
|
{ KE_KEY, 0x3007, { KEY_NUMERIC_7 } },
|
|
{ KE_KEY, 0x3008, { KEY_NUMERIC_8 } },
|
|
{ KE_KEY, 0x3009, { KEY_NUMERIC_9 } },
|
|
{ KE_KEY, 0x3022, { KEY_ENTER } },
|
|
{ KE_KEY, 0x30ec, { KEY_MODE } }, /* "tv/vcr/..." */
|
|
{ KE_KEY, 0x300f, { KEY_SELECT } }, /* "info" */
|
|
{ KE_KEY, 0x3020, { KEY_CHANNELUP } }, /* "up" */
|
|
{ KE_KEY, 0x302e, { KEY_MENU } }, /* "in/out" */
|
|
{ KE_KEY, 0x3011, { KEY_VOLUMEDOWN } }, /* "left" */
|
|
{ KE_KEY, 0x300d, { KEY_MUTE } }, /* "ok" */
|
|
{ KE_KEY, 0x3010, { KEY_VOLUMEUP } }, /* "right" */
|
|
{ KE_KEY, 0x301e, { KEY_SUBTITLE } }, /* "cc" */
|
|
{ KE_KEY, 0x3021, { KEY_CHANNELDOWN } },/* "down" */
|
|
{ KE_KEY, 0x3022, { KEY_PREVIOUS } },
|
|
{ KE_KEY, 0x3026, { KEY_SLEEP } },
|
|
{ KE_KEY, 0x3172, { KEY_REWIND } }, /* NOTE: docs wrongly say 0x30ca */
|
|
{ KE_KEY, 0x3175, { KEY_PLAY } },
|
|
{ KE_KEY, 0x3174, { KEY_FASTFORWARD } },
|
|
{ KE_KEY, 0x3177, { KEY_RECORD } },
|
|
{ KE_KEY, 0x3176, { KEY_STOP } },
|
|
{ KE_KEY, 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)
|
|
{
|
|
static u16 last_event;
|
|
struct dm355evm_keys *keys = _keys;
|
|
const struct key_entry *ke;
|
|
unsigned int keycode;
|
|
int status;
|
|
u16 event;
|
|
|
|
/* For simplicity we ignore INPUT_COUNT and just read
|
|
* events until we get the "queue empty" indicator.
|
|
* Reading INPUT_LOW decrements the count.
|
|
*/
|
|
for (;;) {
|
|
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 report it as unknown */
|
|
ke = sparse_keymap_entry_from_scancode(keys->input, event);
|
|
keycode = ke ? ke->keycode : KEY_UNKNOWN;
|
|
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 __devinit dm355evm_keys_probe(struct platform_device *pdev)
|
|
{
|
|
struct dm355evm_keys *keys;
|
|
struct input_dev *input;
|
|
int status;
|
|
|
|
/* 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);
|
|
|
|
status = sparse_keymap_setup(input, dm355evm_keys, NULL);
|
|
if (status)
|
|
goto fail1;
|
|
|
|
/* 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 fail2;
|
|
|
|
/* register */
|
|
status = input_register_device(input);
|
|
if (status < 0)
|
|
goto fail3;
|
|
|
|
platform_set_drvdata(pdev, keys);
|
|
|
|
return 0;
|
|
|
|
fail3:
|
|
free_irq(keys->irq, keys);
|
|
fail2:
|
|
sparse_keymap_free(input);
|
|
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);
|
|
sparse_keymap_free(keys->input);
|
|
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");
|