From: David Brownell <[email protected]> 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: David Brownell <[email protected]> --- NOTE: IRQ support needs the patch for non-banked GPIO IRQs. And there's a FIXME left in this code; easy enough to work around, but deserves fixing before this goes upstream. arch/arm/mach-davinci/board-dm365-evm.c | 3 drivers/input/misc/Kconfig | 10 drivers/input/misc/Makefile | 1 drivers/input/misc/dm365evm_keys.c | 323 ++++++++++++++++++++++++++++++ 4 files changed, 337 insertions(+) --- a/arch/arm/mach-davinci/board-dm365-evm.c +++ b/arch/arm/mach-davinci/board-dm365-evm.c @@ -179,6 +179,9 @@ static struct at24_platform_data eeprom_ static struct i2c_board_info i2c_info[] = { { + I2C_BOARD_INFO("dm365evm_keys", 0x25), + }, + { I2C_BOARD_INFO("24c256", 0x50), .platform_data = &eeprom_info, }, --- a/drivers/input/misc/Kconfig +++ b/drivers/input/misc/Kconfig @@ -259,4 +259,14 @@ config INPUT_DM355EVM To compile this driver as a module, choose M here: the 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. + endif --- a/drivers/input/misc/Makefile +++ b/drivers/input/misc/Makefile @@ -11,6 +11,7 @@ obj-$(CONFIG_INPUT_ATLAS_BTNS) += atlas obj-$(CONFIG_INPUT_CM109) += cm109.o obj-$(CONFIG_INPUT_COBALT_BTNS) += cobalt_btns.o obj-$(CONFIG_INPUT_DM355EVM) += dm355evm_keys.o +obj-$(CONFIG_INPUT_DM365EVM) += dm365evm_keys.o obj-$(CONFIG_HP_SDC_RTC) += hp_sdc_rtc.o obj-$(CONFIG_INPUT_IXP4XX_BEEPER) += ixp4xx-beeper.o obj-$(CONFIG_INPUT_KEYSPAN_REMOTE) += keyspan_remote.o --- /dev/null +++ b/drivers/input/misc/dm365evm_keys.c @@ -0,0 +1,323 @@ +/* + * 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> + + +/* + * 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"); _______________________________________________ Davinci-linux-open-source mailing list [email protected] http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source
