239 lines
7.1 KiB
C
239 lines
7.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* dm355evm_keys.c - support buttons and IR remote on DM355 EVM board
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*
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* Copyright (c) 2008 by David Brownell
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/input.h>
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#include <linux/input/sparse-keymap.h>
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#include <linux/platform_device.h>
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#include <linux/interrupt.h>
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#include <linux/mfd/dm355evm_msp.h>
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#include <linux/module.h>
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/*
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* The MSP430 firmware on the DM355 EVM monitors on-board pushbuttons
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* and an IR receptor used for the remote control. When any key is
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* pressed, or its autorepeat kicks in, an event is sent. This driver
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* read those events from the small (32 event) queue and reports them.
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*
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* Note that physically there can only be one of these devices.
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*
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* This driver was tested with firmware revision A4.
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*/
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struct dm355evm_keys {
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struct input_dev *input;
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struct device *dev;
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};
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/* These initial keycodes can be remapped */
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static const struct key_entry dm355evm_keys[] = {
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/*
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* Pushbuttons on the EVM board ... note that the labels for these
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* are SW10/SW11/etc on the PC board. The left/right orientation
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* comes only from the firmware's documentation, and presumes the
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* power connector is immediately in front of you and the IR sensor
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* is to the right. (That is, rotate the board counter-clockwise
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* by 90 degrees from the SW10/etc and "DM355 EVM" labels.)
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*/
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{ KE_KEY, 0x00d8, { KEY_OK } }, /* SW12 */
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{ KE_KEY, 0x00b8, { KEY_UP } }, /* SW13 */
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{ KE_KEY, 0x00e8, { KEY_DOWN } }, /* SW11 */
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{ KE_KEY, 0x0078, { KEY_LEFT } }, /* SW14 */
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{ KE_KEY, 0x00f0, { KEY_RIGHT } }, /* SW10 */
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/*
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* IR buttons ... codes assigned to match the universal remote
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* provided with the EVM (Philips PM4S) using DVD code 0020.
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*
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* These event codes match firmware documentation, but other
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* remote controls could easily send more RC5-encoded events.
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* The PM4S manual was used in several cases to help select
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* a keycode reflecting the intended usage.
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*
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* RC5 codes are 14 bits, with two start bits (0x3 prefix)
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* and a toggle bit (masked out below).
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*/
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{ KE_KEY, 0x300c, { KEY_POWER } }, /* NOTE: docs omit this */
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{ KE_KEY, 0x3000, { KEY_NUMERIC_0 } },
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{ KE_KEY, 0x3001, { KEY_NUMERIC_1 } },
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{ KE_KEY, 0x3002, { KEY_NUMERIC_2 } },
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{ KE_KEY, 0x3003, { KEY_NUMERIC_3 } },
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{ KE_KEY, 0x3004, { KEY_NUMERIC_4 } },
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{ KE_KEY, 0x3005, { KEY_NUMERIC_5 } },
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{ KE_KEY, 0x3006, { KEY_NUMERIC_6 } },
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{ KE_KEY, 0x3007, { KEY_NUMERIC_7 } },
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{ KE_KEY, 0x3008, { KEY_NUMERIC_8 } },
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{ KE_KEY, 0x3009, { KEY_NUMERIC_9 } },
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{ KE_KEY, 0x3022, { KEY_ENTER } },
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{ KE_KEY, 0x30ec, { KEY_MODE } }, /* "tv/vcr/..." */
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{ KE_KEY, 0x300f, { KEY_SELECT } }, /* "info" */
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{ KE_KEY, 0x3020, { KEY_CHANNELUP } }, /* "up" */
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{ KE_KEY, 0x302e, { KEY_MENU } }, /* "in/out" */
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{ KE_KEY, 0x3011, { KEY_VOLUMEDOWN } }, /* "left" */
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{ KE_KEY, 0x300d, { KEY_MUTE } }, /* "ok" */
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{ KE_KEY, 0x3010, { KEY_VOLUMEUP } }, /* "right" */
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{ KE_KEY, 0x301e, { KEY_SUBTITLE } }, /* "cc" */
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{ KE_KEY, 0x3021, { KEY_CHANNELDOWN } },/* "down" */
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{ KE_KEY, 0x3022, { KEY_PREVIOUS } },
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{ KE_KEY, 0x3026, { KEY_SLEEP } },
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{ KE_KEY, 0x3172, { KEY_REWIND } }, /* NOTE: docs wrongly say 0x30ca */
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{ KE_KEY, 0x3175, { KEY_PLAY } },
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{ KE_KEY, 0x3174, { KEY_FASTFORWARD } },
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{ KE_KEY, 0x3177, { KEY_RECORD } },
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{ KE_KEY, 0x3176, { KEY_STOP } },
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{ KE_KEY, 0x3169, { KEY_PAUSE } },
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};
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/*
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* Because we communicate with the MSP430 using I2C, and all I2C calls
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* in Linux sleep, we use a threaded IRQ handler. The IRQ itself is
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* active low, but we go through the GPIO controller so we can trigger
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* on falling edges and not worry about enabling/disabling the IRQ in
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* the keypress handling path.
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*/
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static irqreturn_t dm355evm_keys_irq(int irq, void *_keys)
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{
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static u16 last_event;
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struct dm355evm_keys *keys = _keys;
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const struct key_entry *ke;
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unsigned int keycode;
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int status;
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u16 event;
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/* For simplicity we ignore INPUT_COUNT and just read
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* events until we get the "queue empty" indicator.
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* Reading INPUT_LOW decrements the count.
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*/
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for (;;) {
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status = dm355evm_msp_read(DM355EVM_MSP_INPUT_HIGH);
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if (status < 0) {
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dev_dbg(keys->dev, "input high err %d\n",
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status);
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break;
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}
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event = status << 8;
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status = dm355evm_msp_read(DM355EVM_MSP_INPUT_LOW);
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if (status < 0) {
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dev_dbg(keys->dev, "input low err %d\n",
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status);
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break;
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}
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event |= status;
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if (event == 0xdead)
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break;
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/* Press and release a button: two events, same code.
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* Press and hold (autorepeat), then release: N events
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* (N > 2), same code. For RC5 buttons the toggle bits
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* distinguish (for example) "1-autorepeat" from "1 1";
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* but PCB buttons don't support that bit.
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*
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* So we must synthesize release events. We do that by
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* mapping events to a press/release event pair; then
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* to avoid adding extra events, skip the second event
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* of each pair.
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*/
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if (event == last_event) {
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last_event = 0;
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continue;
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}
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last_event = event;
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/* ignore the RC5 toggle bit */
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event &= ~0x0800;
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/* find the key, or report it as unknown */
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ke = sparse_keymap_entry_from_scancode(keys->input, event);
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keycode = ke ? ke->keycode : KEY_UNKNOWN;
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dev_dbg(keys->dev,
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"input event 0x%04x--> keycode %d\n",
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event, keycode);
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/* report press + release */
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input_report_key(keys->input, keycode, 1);
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input_sync(keys->input);
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input_report_key(keys->input, keycode, 0);
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input_sync(keys->input);
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}
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return IRQ_HANDLED;
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}
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/*----------------------------------------------------------------------*/
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static int dm355evm_keys_probe(struct platform_device *pdev)
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{
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struct dm355evm_keys *keys;
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struct input_dev *input;
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int irq;
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int error;
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keys = devm_kzalloc(&pdev->dev, sizeof (*keys), GFP_KERNEL);
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if (!keys)
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return -ENOMEM;
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input = devm_input_allocate_device(&pdev->dev);
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if (!input)
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return -ENOMEM;
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keys->dev = &pdev->dev;
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keys->input = input;
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input->name = "DM355 EVM Controls";
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input->phys = "dm355evm/input0";
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input->id.bustype = BUS_I2C;
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input->id.product = 0x0355;
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input->id.version = dm355evm_msp_read(DM355EVM_MSP_FIRMREV);
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error = sparse_keymap_setup(input, dm355evm_keys, NULL);
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if (error)
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return error;
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/* REVISIT: flush the event queue? */
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/* set up "threaded IRQ handler" */
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irq = platform_get_irq(pdev, 0);
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if (irq < 0)
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return irq;
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error = devm_request_threaded_irq(&pdev->dev, irq,
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NULL, dm355evm_keys_irq,
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IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
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dev_name(&pdev->dev), keys);
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if (error)
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return error;
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/* register */
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error = input_register_device(input);
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if (error)
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return error;
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return 0;
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}
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/* REVISIT: add suspend/resume when DaVinci supports it. The IRQ should
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* be able to wake up the system. When device_may_wakeup(&pdev->dev), call
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* enable_irq_wake() on suspend, and disable_irq_wake() on resume.
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*/
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/*
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* I2C is used to talk to the MSP430, but this platform device is
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* exposed by an MFD driver that manages I2C communications.
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*/
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static struct platform_driver dm355evm_keys_driver = {
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.probe = dm355evm_keys_probe,
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.driver = {
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.name = "dm355evm_keys",
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},
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};
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module_platform_driver(dm355evm_keys_driver);
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MODULE_LICENSE("GPL");
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