Commit ff99aab4 authored by David Brownell's avatar David Brownell Committed by Kevin Hilman

davinci: dm365evm_keys driver

Add basic driver for the MSP430 on the DM 365 EVM; it's used
only to report commands from an IR remote.  (This assumes the
same remote used with other DaVinci EVM boards.)
Signed-off-by: default avatarDavid Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: default avatarKevin Hilman <khilman@deeprootsystems.com>
parent e40152ee
...@@ -183,6 +183,9 @@ static struct at24_platform_data eeprom_info = { ...@@ -183,6 +183,9 @@ static struct at24_platform_data eeprom_info = {
static struct snd_platform_data dm365_evm_snd_data; static struct snd_platform_data dm365_evm_snd_data;
static struct i2c_board_info i2c_info[] = { static struct i2c_board_info i2c_info[] = {
{
I2C_BOARD_INFO("dm365evm_keys", 0x25),
},
{ {
I2C_BOARD_INFO("24c256", 0x50), I2C_BOARD_INFO("24c256", 0x50),
.platform_data = &eeprom_info, .platform_data = &eeprom_info,
......
...@@ -311,6 +311,15 @@ config INPUT_DM355EVM ...@@ -311,6 +311,15 @@ config INPUT_DM355EVM
To compile this driver as a module, choose M here: the To compile this driver as a module, choose M here: the
module will be called dm355evm_keys. module will be called dm355evm_keys.
config INPUT_DM365EVM
tristate "TI DaVinci DM365 EVM IR Remote"
depends on MACH_DAVINCI_DM365_EVM
help
Supports the IR remote used with the DM365 EVM board.
To compile this driver as a module, choose M here: the
module will be called dm365evm_keys.
config INPUT_BFIN_ROTARY config INPUT_BFIN_ROTARY
tristate "Blackfin Rotary support" tristate "Blackfin Rotary support"
depends on BF54x || BF52x depends on BF54x || BF52x
......
...@@ -13,6 +13,7 @@ obj-$(CONFIG_INPUT_BFIN_ROTARY) += bfin_rotary.o ...@@ -13,6 +13,7 @@ obj-$(CONFIG_INPUT_BFIN_ROTARY) += bfin_rotary.o
obj-$(CONFIG_INPUT_CM109) += cm109.o obj-$(CONFIG_INPUT_CM109) += cm109.o
obj-$(CONFIG_INPUT_COBALT_BTNS) += cobalt_btns.o obj-$(CONFIG_INPUT_COBALT_BTNS) += cobalt_btns.o
obj-$(CONFIG_INPUT_DM355EVM) += dm355evm_keys.o obj-$(CONFIG_INPUT_DM355EVM) += dm355evm_keys.o
obj-$(CONFIG_INPUT_DM365EVM) += dm365evm_keys.o
obj-$(CONFIG_HP_SDC_RTC) += hp_sdc_rtc.o obj-$(CONFIG_HP_SDC_RTC) += hp_sdc_rtc.o
obj-$(CONFIG_INPUT_IXP4XX_BEEPER) += ixp4xx-beeper.o obj-$(CONFIG_INPUT_IXP4XX_BEEPER) += ixp4xx-beeper.o
obj-$(CONFIG_INPUT_KEYSPAN_REMOTE) += keyspan_remote.o obj-$(CONFIG_INPUT_KEYSPAN_REMOTE) += keyspan_remote.o
......
/*
* dm365evm_keys.c - support IR remote on DM365 EVM board
*
* Copyright (c) 2009 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/i2c.h>
#include <linux/interrupt.h>
#include <linux/gpio.h>
#include <linux/slab.h>
/*
* The MSP430 firmware on the DM365 EVM monitors 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
* event queue and reports them.
*
* Compared to the DM355 EVM: the MSP firmware does *only* IR. So this
* driver is simpler, and doesn't even need to use the MFD model.
*
* Note that physically there can only be one of these devices.
*
* This driver was tested with firmware revision 0xA1 (beta board).
*/
struct dm365evm_keys {
struct input_dev *input;
struct i2c_client *i2c;
};
#define DM365EVM_MSP_FIRMREV 0
#define DM365EVM_MSP_INPUT_LOW 1
#define DM365EVM_MSP_INPUT_HIGH 2
#define DM365EVM_MSP_INPUT_COUNT 3
#define DM365EVM_MSP_0x43 4
#define MSP430_GPIO 0
/* These initial keycodes can be remapped by dm365evm_setkeycode(). */
static struct {
u16 event;
u16 keycode;
} dm365evm_keys[] = {
/*
* 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, },
{ 0x3175, KEY_PLAY, },
{ 0x3174, KEY_FASTFORWARD, },
{ 0x3177, KEY_RECORD, },
{ 0x3176, KEY_STOP, },
{ 0x3169, KEY_PAUSE, },
/* NOTE: SW22, a pushbutton next to the IR sensor, is also
* wired to the MSP430 but is currently ignored; some other
* I/O pins are likewise wired but ignored.
*/
};
static irqreturn_t dm365evm_keys_irq(int irq, void *_keys)
{
struct dm365evm_keys *keys = _keys;
/* For simplicity we ignore INPUT_COUNT and just read
* events until the GPIO stops signaling data ready.
*/
while (gpio_get_value(MSP430_GPIO) == 0) {
static u16 last_event;
u16 event;
int keycode;
int i;
/* Read low, then high bytes; reading the high byte
* removes an entry from the input buffer.
*/
event = i2c_smbus_read_word_data(keys->i2c,
DM365EVM_MSP_INPUT_LOW);
if (event < 0) {
dev_dbg(&keys->i2c->dev, "input err %d\n", event);
break;
}
event = event;
/* 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(dm365evm_keys); i++) {
if (dm365evm_keys[i].event != event)
continue;
keycode = dm365evm_keys[i].keycode;
break;
}
dev_dbg(&keys->i2c->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;
}
/*
* Since we talk to the MSP using I2C, we need to delegate all real
* IRQ handling work to some task context. We'll use an IRQ thread.
*/
static irqreturn_t dm365evm_keys_hardirq(int irq, void *_keys)
{
return IRQ_WAKE_THREAD;
}
static int dm365evm_setkeycode(struct input_dev *dev, int index, int keycode)
{
u16 old_keycode;
unsigned i;
if (((unsigned)index) >= ARRAY_SIZE(dm365evm_keys))
return -EINVAL;
old_keycode = dm365evm_keys[index].keycode;
dm365evm_keys[index].keycode = keycode;
set_bit(keycode, dev->keybit);
for (i = 0; i < ARRAY_SIZE(dm365evm_keys); i++) {
if (dm365evm_keys[index].keycode == old_keycode)
goto done;
}
clear_bit(old_keycode, dev->keybit);
done:
return 0;
}
static int dm365evm_getkeycode(struct input_dev *dev, int index, int *keycode)
{
if (((unsigned)index) >= ARRAY_SIZE(dm365evm_keys))
return -EINVAL;
return dm365evm_keys[index].keycode;
}
/*----------------------------------------------------------------------*/
static int __devinit
dm365evm_keys_probe(struct i2c_client *i2c, const struct i2c_device_id *id)
{
struct dm365evm_keys *keys;
struct input_dev *input;
int status;
int i;
status = gpio_request(MSP430_GPIO, id->name);
if (status < 0)
return status;
status = gpio_direction_input(MSP430_GPIO);
if (status < 0) {
gpio_free(MSP430_GPIO);
return 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->i2c = i2c;
keys->input = input;
input_set_drvdata(input, keys);
input->name = "DM365 EVM Controls";
input->phys = "dm365evm/input0";
input->dev.parent = &i2c->dev;
input->id.bustype = BUS_I2C;
input->id.product = 0x0365;
input->id.version = i2c_smbus_read_byte_data(i2c,
DM365EVM_MSP_FIRMREV);
input->evbit[0] = BIT(EV_KEY);
for (i = 0; i < ARRAY_SIZE(dm365evm_keys); i++)
__set_bit(dm365evm_keys[i].keycode, input->keybit);
input->setkeycode = dm365evm_setkeycode;
input->getkeycode = dm365evm_getkeycode;
/* FIXME: flush the event queue */
status = request_threaded_irq(gpio_to_irq(MSP430_GPIO),
dm365evm_keys_hardirq, dm365evm_keys_irq,
IRQF_TRIGGER_FALLING,
id->name, keys);
if (status < 0)
goto fail1;
/* register */
status = input_register_device(input);
if (status < 0)
goto fail2;
i2c_set_clientdata(i2c, keys);
return 0;
fail2:
free_irq(gpio_to_irq(MSP430_GPIO), keys);
fail1:
input_free_device(input);
kfree(keys);
gpio_free(MSP430_GPIO);
dev_err(&i2c->dev, "can't register, err %d\n", status);
return status;
}
static int __devexit dm365evm_keys_remove(struct i2c_client *i2c)
{
struct dm365evm_keys *keys = i2c_get_clientdata(i2c);
free_irq(gpio_to_irq(MSP430_GPIO), keys);
input_unregister_device(keys->input);
kfree(keys);
gpio_free(MSP430_GPIO);
return 0;
}
/* REVISIT: add suspend/resume when DaVinci supports it. The IRQ should
* be able to wake up the system. When device_may_wakeup(&i2c->dev), call
* enable_irq_wake() on suspend, and disable_irq_wake() on resume.
*/
static const struct i2c_device_id ids[] = {
{ .name = "dm365evm_keys", },
{ },
};
MODULE_DEVICE_TABLE(i2c, ids);
static struct i2c_driver dm365evm_keys_driver = {
.driver.name = "dm365evm_keys",
.id_table = ids,
.probe = dm365evm_keys_probe,
.remove = __devexit_p(dm365evm_keys_remove),
};
static int __init dm365evm_keys_init(void)
{
return i2c_add_driver(&dm365evm_keys_driver);
}
module_init(dm365evm_keys_init);
static void __exit dm365evm_keys_exit(void)
{
i2c_del_driver(&dm365evm_keys_driver);
}
module_exit(dm365evm_keys_exit);
MODULE_LICENSE("GPL");
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