From patchwork Tue Sep 3 21:36:37 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anson Huang X-Patchwork-Id: 11127525 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id D8988112C for ; Tue, 3 Sep 2019 09:38:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BACF2206B8 for ; Tue, 3 Sep 2019 09:38:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728621AbfICJiC (ORCPT ); Tue, 3 Sep 2019 05:38:02 -0400 Received: from inva021.nxp.com ([92.121.34.21]:54684 "EHLO inva021.nxp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728122AbfICJiB (ORCPT ); Tue, 3 Sep 2019 05:38:01 -0400 Received: from inva021.nxp.com (localhost [127.0.0.1]) by inva021.eu-rdc02.nxp.com (Postfix) with ESMTP id 902BC2002F2; Tue, 3 Sep 2019 11:37:58 +0200 (CEST) Received: from invc005.ap-rdc01.nxp.com (invc005.ap-rdc01.nxp.com [165.114.16.14]) by inva021.eu-rdc02.nxp.com (Postfix) with ESMTP id 35C02200177; Tue, 3 Sep 2019 11:37:40 +0200 (CEST) Received: from localhost.localdomain (shlinux2.ap.freescale.net [10.192.224.44]) by invc005.ap-rdc01.nxp.com (Postfix) with ESMTP id 3F8314030B; Tue, 3 Sep 2019 17:37:26 +0800 (SGT) From: Anson Huang To: robh+dt@kernel.org, mark.rutland@arm.com, shawnguo@kernel.org, s.hauer@pengutronix.de, kernel@pengutronix.de, festevam@gmail.com, catalin.marinas@arm.com, will@kernel.org, dmitry.torokhov@gmail.com, aisheng.dong@nxp.com, ulf.hansson@linaro.org, fugang.duan@nxp.com, peng.fan@nxp.com, daniel.baluta@nxp.com, leonard.crestez@nxp.com, mripard@kernel.org, olof@lixom.net, arnd@arndb.de, jagan@amarulasolutions.com, bjorn.andersson@linaro.org, dinguyen@kernel.org, marcin.juszkiewicz@linaro.org, stefan@agner.ch, gregkh@linuxfoundation.org, andriy.shevchenko@linux.intel.com, yuehaibing@huawei.com, tglx@linutronix.de, ronald@innovation.ch, m.felsch@pengutronix.de, ping.bai@nxp.com, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-input@vger.kernel.org Cc: Linux-imx@nxp.com Subject: [PATCH V3 2/5] input: keyboard: imx_sc: Add i.MX system controller key support Date: Tue, 3 Sep 2019 17:36:37 -0400 Message-Id: <1567546600-21566-2-git-send-email-Anson.Huang@nxp.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1567546600-21566-1-git-send-email-Anson.Huang@nxp.com> References: <1567546600-21566-1-git-send-email-Anson.Huang@nxp.com> X-Virus-Scanned: ClamAV using ClamSMTP Sender: linux-input-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org i.MX8QXP is an ARMv8 SoC which has a Cortex-M4 system controller inside, the system controller is in charge of controlling power, clock and scu key etc.. Adds i.MX system controller key driver support, Linux kernel has to communicate with system controller via MU (message unit) IPC to get scu key's status. Signed-off-by: Anson Huang Reviewed-by: Oleksij Rempel --- Changes since V2: - use private platform data instead of global data; - use "key" instead of "pwrkey"; - fix some data format. --- drivers/input/keyboard/Kconfig | 7 ++ drivers/input/keyboard/Makefile | 1 + drivers/input/keyboard/imx_sc_key.c | 178 ++++++++++++++++++++++++++++++++++++ 3 files changed, 186 insertions(+) create mode 100644 drivers/input/keyboard/imx_sc_key.c diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig index 2e6d288..607acf2 100644 --- a/drivers/input/keyboard/Kconfig +++ b/drivers/input/keyboard/Kconfig @@ -469,6 +469,13 @@ config KEYBOARD_IMX To compile this driver as a module, choose M here: the module will be called imx_keypad. +config KEYBOARD_IMX_SC_KEY + tristate "IMX SCU Key Driver" + depends on IMX_SCU + help + This is the system controller key driver for NXP i.MX SoCs with + system controller inside. + config KEYBOARD_NEWTON tristate "Newton keyboard" select SERIO diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile index 9510325..f5b1752 100644 --- a/drivers/input/keyboard/Makefile +++ b/drivers/input/keyboard/Makefile @@ -29,6 +29,7 @@ obj-$(CONFIG_KEYBOARD_HIL) += hil_kbd.o obj-$(CONFIG_KEYBOARD_HIL_OLD) += hilkbd.o obj-$(CONFIG_KEYBOARD_IPAQ_MICRO) += ipaq-micro-keys.o obj-$(CONFIG_KEYBOARD_IMX) += imx_keypad.o +obj-$(CONFIG_KEYBOARD_IMX_SC_KEY) += imx_sc_key.o obj-$(CONFIG_KEYBOARD_HP6XX) += jornada680_kbd.o obj-$(CONFIG_KEYBOARD_HP7XX) += jornada720_kbd.o obj-$(CONFIG_KEYBOARD_LKKBD) += lkkbd.o diff --git a/drivers/input/keyboard/imx_sc_key.c b/drivers/input/keyboard/imx_sc_key.c new file mode 100644 index 0000000..e69479b --- /dev/null +++ b/drivers/input/keyboard/imx_sc_key.c @@ -0,0 +1,178 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright 2019 NXP. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define DEBOUNCE_TIME 100 +#define REPEAT_INTERVAL 60 + +#define SC_IRQ_BUTTON 1 +#define SC_IRQ_GROUP_WAKE 3 +#define IMX_SC_MISC_FUNC_GET_BUTTON_STATUS 18 + +struct imx_key_drv_data { + int keycode; + bool keystate; /* 1: pressed, 0: release */ + bool delay_check; + struct delayed_work check_work; + struct input_dev *input; + struct imx_sc_ipc *key_ipc_handle; + struct notifier_block key_notifier; +}; + +struct imx_sc_msg_key { + struct imx_sc_rpc_msg hdr; + u8 state; +}; + +static int imx_sc_key_notify(struct notifier_block *nb, + unsigned long event, void *group) +{ + struct imx_key_drv_data *priv = + container_of(nb, + struct imx_key_drv_data, + key_notifier); + + if ((event & SC_IRQ_BUTTON) && (*(u8 *)group == SC_IRQ_GROUP_WAKE) + && !priv->delay_check) { + priv->delay_check = 1; + schedule_delayed_work(&priv->check_work, + msecs_to_jiffies(REPEAT_INTERVAL)); + } + + return 0; +} + +static void imx_sc_check_for_events(struct work_struct *work) +{ + struct imx_key_drv_data *priv = + container_of(work, + struct imx_key_drv_data, + check_work.work); + struct input_dev *input = priv->input; + struct imx_sc_msg_key msg; + struct imx_sc_rpc_msg *hdr = &msg.hdr; + bool state; + int ret; + + hdr->ver = IMX_SC_RPC_VERSION; + hdr->svc = IMX_SC_RPC_SVC_MISC; + hdr->func = IMX_SC_MISC_FUNC_GET_BUTTON_STATUS; + hdr->size = 1; + + ret = imx_scu_call_rpc(priv->key_ipc_handle, &msg, true); + if (ret) { + dev_err(&input->dev, "read imx sc key failed, ret %d\n", ret); + return; + } + + state = (bool)msg.state; + + if (!state && !priv->keystate) + state = true; + + if (state ^ priv->keystate) { + pm_wakeup_event(input->dev.parent, 0); + priv->keystate = state; + input_event(input, EV_KEY, priv->keycode, state); + input_sync(input); + if (!state) + priv->delay_check = 0; + pm_relax(priv->input->dev.parent); + } + + if (state) + schedule_delayed_work(&priv->check_work, + msecs_to_jiffies(DEBOUNCE_TIME)); +} + +static int imx_sc_key_probe(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + static struct imx_key_drv_data *priv; + struct input_dev *input; + int ret; + + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + ret = imx_scu_get_handle(&priv->key_ipc_handle); + if (ret) + return ret; + + if (of_property_read_u32(np, "linux,keycode", &priv->keycode)) { + dev_err(&pdev->dev, "missing KEY_POWER in DT\n"); + return -EINVAL; + } + + INIT_DELAYED_WORK(&priv->check_work, imx_sc_check_for_events); + + input = devm_input_allocate_device(&pdev->dev); + if (!input) { + dev_err(&pdev->dev, "failed to allocate the input device\n"); + return -ENOMEM; + } + + input->name = pdev->name; + input->phys = "imx-sc-key/input0"; + input->id.bustype = BUS_HOST; + + input_set_capability(input, EV_KEY, priv->keycode); + + ret = input_register_device(input); + if (ret) { + dev_err(&pdev->dev, "failed to register input device\n"); + return ret; + } + + priv->input = input; + platform_set_drvdata(pdev, priv); + + ret = imx_scu_irq_group_enable(SC_IRQ_GROUP_WAKE, SC_IRQ_BUTTON, true); + if (ret) { + dev_warn(&pdev->dev, "enable scu group irq failed\n"); + return ret; + } + + priv->key_notifier.notifier_call = imx_sc_key_notify; + ret = imx_scu_irq_register_notifier(&priv->key_notifier); + if (ret) { + imx_scu_irq_group_enable(SC_IRQ_GROUP_WAKE, SC_IRQ_BUTTON, false); + dev_warn(&pdev->dev, "register scu notifier failed\n"); + } + + return ret; +} + +static const struct of_device_id imx_sc_key_ids[] = { + { .compatible = "fsl,imx-sc-key" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, imx_sc_key_ids); + +static struct platform_driver imx_sc_key_driver = { + .driver = { + .name = "imx-sc-key", + .of_match_table = imx_sc_key_ids, + }, + .probe = imx_sc_key_probe, +}; +module_platform_driver(imx_sc_key_driver); + +MODULE_AUTHOR("Anson Huang "); +MODULE_DESCRIPTION("i.MX System Controller Key Driver"); +MODULE_LICENSE("GPL v2");