// SPDX-License-Identifier: GPL-2.0
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/*
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* nvec_kbd: keyboard driver for a NVIDIA compliant embedded controller
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*
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* Copyright (C) 2011 The AC100 Kernel Team <ac100@lists.launchpad.net>
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*
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* Authors: Pierre-Hugues Husson <phhusson@free.fr>
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* Marc Dietrich <marvin24@gmx.de>
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/input.h>
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#include <linux/delay.h>
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#include <linux/platform_device.h>
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#include "nvec-keytable.h"
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#include "nvec.h"
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enum kbd_subcmds {
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CNFG_WAKE = 3,
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CNFG_WAKE_KEY_REPORTING,
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SET_LEDS = 0xed,
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ENABLE_KBD = 0xf4,
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DISABLE_KBD,
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};
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static unsigned char keycodes[ARRAY_SIZE(code_tab_102us)
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+ ARRAY_SIZE(extcode_tab_us102)];
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struct nvec_keys {
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struct input_dev *input;
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struct notifier_block notifier;
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struct nvec_chip *nvec;
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bool caps_lock;
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};
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static struct nvec_keys keys_dev;
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static void nvec_kbd_toggle_led(void)
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{
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char buf[] = { NVEC_KBD, SET_LEDS, 0 };
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keys_dev.caps_lock = !keys_dev.caps_lock;
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if (keys_dev.caps_lock)
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/* should be BIT(0) only, firmware bug? */
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buf[2] = BIT(0) | BIT(1) | BIT(2);
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nvec_write_async(keys_dev.nvec, buf, sizeof(buf));
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}
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static int nvec_keys_notifier(struct notifier_block *nb,
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unsigned long event_type, void *data)
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{
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int code, state;
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unsigned char *msg = data;
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if (event_type == NVEC_KB_EVT) {
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int _size = (msg[0] & (3 << 5)) >> 5;
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/* power on/off button */
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if (_size == NVEC_VAR_SIZE)
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return NOTIFY_STOP;
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if (_size == NVEC_3BYTES)
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msg++;
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code = msg[1] & 0x7f;
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state = msg[1] & 0x80;
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if (code_tabs[_size][code] == KEY_CAPSLOCK && state)
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nvec_kbd_toggle_led();
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input_report_key(keys_dev.input, code_tabs[_size][code],
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!state);
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input_sync(keys_dev.input);
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return NOTIFY_STOP;
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}
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return NOTIFY_DONE;
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}
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static int nvec_kbd_event(struct input_dev *dev, unsigned int type,
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unsigned int code, int value)
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{
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struct nvec_chip *nvec = keys_dev.nvec;
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char buf[] = { NVEC_KBD, SET_LEDS, 0 };
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if (type == EV_REP)
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return 0;
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if (type != EV_LED)
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return -1;
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if (code != LED_CAPSL)
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return -1;
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buf[2] = !!value;
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nvec_write_async(nvec, buf, sizeof(buf));
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return 0;
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}
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static int nvec_kbd_probe(struct platform_device *pdev)
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{
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struct nvec_chip *nvec = dev_get_drvdata(pdev->dev.parent);
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int i, j, err;
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struct input_dev *idev;
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char clear_leds[] = { NVEC_KBD, SET_LEDS, 0 },
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enable_kbd[] = { NVEC_KBD, ENABLE_KBD },
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cnfg_wake[] = { NVEC_KBD, CNFG_WAKE, true, true },
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cnfg_wake_key_reporting[] = { NVEC_KBD, CNFG_WAKE_KEY_REPORTING,
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true };
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j = 0;
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for (i = 0; i < ARRAY_SIZE(code_tab_102us); ++i)
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keycodes[j++] = code_tab_102us[i];
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for (i = 0; i < ARRAY_SIZE(extcode_tab_us102); ++i)
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keycodes[j++] = extcode_tab_us102[i];
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idev = devm_input_allocate_device(&pdev->dev);
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if (!idev)
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return -ENOMEM;
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idev->name = "nvec keyboard";
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idev->phys = "nvec";
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idev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP) | BIT_MASK(EV_LED);
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idev->ledbit[0] = BIT_MASK(LED_CAPSL);
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idev->event = nvec_kbd_event;
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idev->keycode = keycodes;
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idev->keycodesize = sizeof(unsigned char);
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idev->keycodemax = ARRAY_SIZE(keycodes);
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for (i = 0; i < ARRAY_SIZE(keycodes); ++i)
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set_bit(keycodes[i], idev->keybit);
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clear_bit(0, idev->keybit);
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err = input_register_device(idev);
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if (err)
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return err;
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keys_dev.input = idev;
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keys_dev.notifier.notifier_call = nvec_keys_notifier;
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keys_dev.nvec = nvec;
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nvec_register_notifier(nvec, &keys_dev.notifier, 0);
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/* Enable keyboard */
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nvec_write_async(nvec, enable_kbd, 2);
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/* configures wake on special keys */
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nvec_write_async(nvec, cnfg_wake, 4);
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/* enable wake key reporting */
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nvec_write_async(nvec, cnfg_wake_key_reporting, 3);
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/* Disable caps lock LED */
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nvec_write_async(nvec, clear_leds, sizeof(clear_leds));
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return 0;
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}
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static int nvec_kbd_remove(struct platform_device *pdev)
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{
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struct nvec_chip *nvec = dev_get_drvdata(pdev->dev.parent);
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char disable_kbd[] = { NVEC_KBD, DISABLE_KBD },
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uncnfg_wake_key_reporting[] = { NVEC_KBD, CNFG_WAKE_KEY_REPORTING,
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false };
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nvec_write_async(nvec, uncnfg_wake_key_reporting, 3);
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nvec_write_async(nvec, disable_kbd, 2);
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nvec_unregister_notifier(nvec, &keys_dev.notifier);
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return 0;
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}
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static struct platform_driver nvec_kbd_driver = {
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.probe = nvec_kbd_probe,
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.remove = nvec_kbd_remove,
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.driver = {
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.name = "nvec-kbd",
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},
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};
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module_platform_driver(nvec_kbd_driver);
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MODULE_AUTHOR("Marc Dietrich <marvin24@gmx.de>");
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MODULE_DESCRIPTION("NVEC keyboard driver");
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MODULE_ALIAS("platform:nvec-kbd");
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MODULE_LICENSE("GPL");
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