input: keyboard: rpmsg-keys: add rpmsg-keys driver
Add rpmsg-keys driver for i.mx7ulp. Signed-off-by: Robin Gong <yibin.gong@nxp.com>5.4-rM2-2.2.x-imx-squashed
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219d54332a
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127f1fb1f2
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@ -0,0 +1,33 @@
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Device-Tree bindings for input/keyboard/rpmsg-keys.c keys driver over
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rpmsg. On i.mx7ULP keys are connected on M4 side, so rpmsg-keys driver
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needed to get the key status from M4 side by rpmsg.
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Required properties:
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- compatible = "fsl,rpmsg-keys";
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Each button/key looked as the sub node:
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Required properties:
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- label: the key name
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- linux,code: the key value defined in
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include/dt-bindings/input/input.h
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Optional property:
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- rpmsg-key,wakeup: wakeup feature, the keys can wakeup from
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suspend if the keys with this property pressed.
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Example nodes:
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rpmsg_keys: rpmsg-keys {
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compatible = "fsl,rpmsg-keys";
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volume-up {
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label = "Volume Up";
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rpmsg-key,wakeup;
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linux,code = <KEY_VOLUMEUP>;
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};
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volume-down {
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label = "Volume Down";
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rpmsg-key,wakeup;
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linux,code = <KEY_VOLUMEDOWN>;
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};
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};
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@ -448,6 +448,17 @@ config KEYBOARD_MPR121
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To compile this driver as a module, choose M here: the
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module will be called mpr121_touchkey.
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config KEYBOARD_RPMSG
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tristate "i.MX Rpmsg Keys Driver"
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depends on (SOC_IMX7ULP)
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depends on RPMSG
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depends on OF
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help
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This is rpmsg keys driver on i.mx7ulp, because some keys located
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in M4 side.
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config KEYBOARD_SNVS_PWRKEY
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tristate "IMX SNVS Power Key Driver"
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depends on ARCH_MXC || COMPILE_TEST
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@ -54,6 +54,7 @@ obj-$(CONFIG_KEYBOARD_PXA930_ROTARY) += pxa930_rotary.o
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obj-$(CONFIG_KEYBOARD_QT1050) += qt1050.o
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obj-$(CONFIG_KEYBOARD_QT1070) += qt1070.o
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obj-$(CONFIG_KEYBOARD_QT2160) += qt2160.o
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obj-$(CONFIG_KEYBOARD_RPMSG) += rpmsg-keys.o
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obj-$(CONFIG_KEYBOARD_SAMSUNG) += samsung-keypad.o
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obj-$(CONFIG_KEYBOARD_SH_KEYSC) += sh_keysc.o
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obj-$(CONFIG_KEYBOARD_SNVS_PWRKEY) += snvs_pwrkey.o
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@ -0,0 +1,310 @@
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/*
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* Copyright 2017 NXP
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <linux/imx_rpmsg.h>
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#include <linux/input.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/pm_qos.h>
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#include <linux/rpmsg.h>
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#include <linux/uaccess.h>
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#include <linux/virtio.h>
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#define RPMSG_TIMEOUT 1000
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enum key_cmd_type {
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KEY_RPMSG_SETUP,
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KEY_RPMSG_REPLY,
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KEY_RPMSG_NOTIFY,
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};
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enum keys_type {
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KEY_PRESS = 1,
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KEY_RELEASE,
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KEY_BOTH,
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};
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struct key_rpmsg_data {
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struct imx_rpmsg_head header;
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u8 key_index;
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union {
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u8 event;
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u8 retcode;
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};
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u8 wakeup;
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} __attribute__((packed));
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struct rpmsg_keys_button {
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unsigned int code;
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enum keys_type type;
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int wakeup;
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struct input_dev *input;
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};
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struct rpmsg_keys_drvdata {
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struct input_dev *input;
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struct rpmsg_device *rpdev;
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struct device *dev;
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struct key_rpmsg_data *msg;
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bool ack;
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struct pm_qos_request pm_qos_req;
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struct delayed_work keysetup_work;
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struct completion cmd_complete;
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int nbuttons;
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struct rpmsg_keys_button buttons[0];
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};
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static struct rpmsg_keys_drvdata *keys_rpmsg;
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static int key_send_message(struct key_rpmsg_data *msg,
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struct rpmsg_keys_drvdata *info, bool ack)
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{
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int err;
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if (!info->rpdev) {
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dev_dbg(info->dev,
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"rpmsg channel not ready, m4 image ready?\n");
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return -EINVAL;
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}
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pm_qos_add_request(&info->pm_qos_req,
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PM_QOS_CPU_DMA_LATENCY, 0);
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if (ack) {
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info->ack = true;
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reinit_completion(&info->cmd_complete);
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}
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err = rpmsg_send(info->rpdev->ept, (void *)msg,
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sizeof(struct key_rpmsg_data));
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if (err) {
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dev_err(&info->rpdev->dev, "rpmsg_send failed: %d\n", err);
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goto err_out;
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}
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if (ack) {
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err = wait_for_completion_timeout(&info->cmd_complete,
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msecs_to_jiffies(RPMSG_TIMEOUT));
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if (!err) {
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dev_err(&info->rpdev->dev, "rpmsg_send timeout!\n");
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err = -ETIMEDOUT;
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goto err_out;
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}
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if (info->msg->retcode != 0) {
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dev_err(&info->rpdev->dev, "rpmsg not ack %d!\n",
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info->msg->retcode);
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err = -EINVAL;
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goto err_out;
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}
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err = 0;
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}
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err_out:
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info->ack = true;
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pm_qos_remove_request(&info->pm_qos_req);
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return err;
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}
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static int keys_rpmsg_cb(struct rpmsg_device *rpdev,
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void *data, int len, void *priv, u32 src)
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{
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struct key_rpmsg_data *msg = (struct key_rpmsg_data *)data;
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if (msg->header.type == KEY_RPMSG_REPLY) {
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keys_rpmsg->msg = msg;
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complete(&keys_rpmsg->cmd_complete);
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return 0;
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} else if (msg->header.type == KEY_RPMSG_NOTIFY) {
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keys_rpmsg->msg = msg;
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keys_rpmsg->ack = false;
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} else
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dev_err(&keys_rpmsg->rpdev->dev, "wrong command type!\n");
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input_event(keys_rpmsg->input, EV_KEY, msg->key_index, msg->event);
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input_sync(keys_rpmsg->input);
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return 0;
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}
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static void keys_init_handler(struct work_struct *work)
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{
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struct key_rpmsg_data msg;
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int i;
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/* setup keys */
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for (i = 0; i < keys_rpmsg->nbuttons; i++) {
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struct rpmsg_keys_button *button = &keys_rpmsg->buttons[i];
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msg.header.cate = IMX_RPMSG_KEY;
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msg.header.major = IMX_RMPSG_MAJOR;
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msg.header.minor = IMX_RMPSG_MINOR;
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msg.header.type = KEY_RPMSG_SETUP;
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msg.header.cmd = 0;
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msg.key_index = button->code;
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msg.wakeup = button->wakeup;
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msg.event = button->type;
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if (key_send_message(&msg, keys_rpmsg, true))
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dev_err(&keys_rpmsg->rpdev->dev,
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"key %d setup failed!\n", button->code);
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}
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}
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static int keys_rpmsg_probe(struct rpmsg_device *rpdev)
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{
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keys_rpmsg->rpdev = rpdev;
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dev_info(&rpdev->dev, "new channel: 0x%x -> 0x%x!\n",
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rpdev->src, rpdev->dst);
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init_completion(&keys_rpmsg->cmd_complete);
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INIT_DELAYED_WORK(&keys_rpmsg->keysetup_work,
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keys_init_handler);
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schedule_delayed_work(&keys_rpmsg->keysetup_work,
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msecs_to_jiffies(100));
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return 0;
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}
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static struct rpmsg_device_id keys_rpmsg_id_table[] = {
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{ .name = "rpmsg-keypad-channel" },
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{ },
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};
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static struct rpmsg_driver keys_rpmsg_driver = {
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.drv.name = "key_rpmsg",
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.drv.owner = THIS_MODULE,
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.id_table = keys_rpmsg_id_table,
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.probe = keys_rpmsg_probe,
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.callback = keys_rpmsg_cb,
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};
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static struct rpmsg_keys_drvdata *
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rpmsg_keys_get_devtree_pdata(struct device *dev)
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{
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struct device_node *node, *pp;
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struct rpmsg_keys_drvdata *ddata;
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struct rpmsg_keys_button *button;
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int nbuttons;
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int i;
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node = dev->of_node;
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if (!node)
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return ERR_PTR(-ENODEV);
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nbuttons = of_get_child_count(node);
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if (nbuttons == 0)
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return ERR_PTR(-ENODEV);
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ddata = devm_kzalloc(dev,
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sizeof(*ddata) + nbuttons *
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sizeof(struct rpmsg_keys_button),
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GFP_KERNEL);
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if (!ddata)
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return ERR_PTR(-ENOMEM);
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ddata->nbuttons = nbuttons;
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i = 0;
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for_each_child_of_node(node, pp) {
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button = &ddata->buttons[i++];
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if (of_property_read_u32(pp, "linux,code", &button->code)) {
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dev_err(dev, "Button without keycode: 0x%x\n",
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button->code);
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return ERR_PTR(-EINVAL);
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}
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button->wakeup = !!of_get_property(pp, "rpmsg-key,wakeup",
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NULL);
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button->type = KEY_BOTH;
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}
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return ddata;
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}
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static int rpmsg_keys_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct rpmsg_keys_drvdata *ddata;
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int i, error;
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struct input_dev *input;
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ddata = rpmsg_keys_get_devtree_pdata(dev);
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if (IS_ERR(ddata))
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return PTR_ERR(ddata);
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input = devm_input_allocate_device(dev);
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if (!input) {
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dev_err(dev, "failed to allocate input device\n");
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return -ENOMEM;
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}
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ddata->input = input;
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keys_rpmsg = ddata;
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platform_set_drvdata(pdev, ddata);
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input->name = pdev->name;
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input->phys = "rpmsg-keys/input0";
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input->dev.parent = &pdev->dev;
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input->id.bustype = BUS_HOST;
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for (i = 0; i < ddata->nbuttons; i++) {
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struct rpmsg_keys_button *button = &ddata->buttons[i];
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input_set_capability(input, EV_KEY, button->code);
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}
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error = input_register_device(input);
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if (error) {
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dev_err(dev, "Unable to register input device, error: %d\n",
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error);
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goto err_out;
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}
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return register_rpmsg_driver(&keys_rpmsg_driver);
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err_out:
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return error;
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}
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static const struct of_device_id rpmsg_keys_of_match[] = {
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{ .compatible = "fsl,rpmsg-keys", },
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{ },
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};
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MODULE_DEVICE_TABLE(of, rpmsg_keys_of_match);
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static struct platform_driver rpmsg_keys_device_driver = {
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.probe = rpmsg_keys_probe,
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.driver = {
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.name = "rpmsg-keys",
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.of_match_table = of_match_ptr(rpmsg_keys_of_match)
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}
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};
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module_platform_driver(rpmsg_keys_device_driver);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Robin Gong <yibin.gong@nxp.com>");
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MODULE_DESCRIPTION("Keyboard driver based on rpmsg");
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