From patchwork Sun Jan 15 07:11:10 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Torokhov X-Patchwork-Id: 9517311 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 417E7601DA for ; Sun, 15 Jan 2017 07:11:36 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3258928446 for ; Sun, 15 Jan 2017 07:11:36 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 259FB28464; Sun, 15 Jan 2017 07:11:36 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.3 required=2.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED, FREEMAIL_FROM, RCVD_IN_DNSWL_HI, RCVD_IN_SORBS_SPAM, T_DKIM_INVALID autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4AAA028446 for ; Sun, 15 Jan 2017 07:11:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750767AbdAOHLR (ORCPT ); Sun, 15 Jan 2017 02:11:17 -0500 Received: from mail-pf0-f193.google.com ([209.85.192.193]:35698 "EHLO mail-pf0-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750729AbdAOHLP (ORCPT ); Sun, 15 Jan 2017 02:11:15 -0500 Received: by mail-pf0-f193.google.com with SMTP id f144so12142050pfa.2; Sat, 14 Jan 2017 23:11:14 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=VBTDOv0s73G2ldGV/G54jXUh1gLUlAQaCsANtQmAVfQ=; b=VcRYayv7lCOxH5JY85fmVpmbXT2Pg898RXJp71jq8vBIxcm8xkJC2LWnCBZ72+BN5W fJlhzQAbcWJSHjVI4aMpF5k3EYyp6OBVLYusKlQILhSor+7BncdYN1bV8rpjWdaapoy5 h2KiKh/v9ZGeCPMZu6t7thOHj7pm79KAgGEH3f9TFwUsTpTq0c6BgUOtuhPMwf8IZher nn6xYvzgumQpeaHnmy9V42wLVH5jvcpJAP4AunGZC6oC7VxpPLKnxte5gZrhtcCmPQsI 0rbtkuj11wV1qNyZ5rWA3OSiXtbXf88rW9ufQtbkZkmhbtYUwO/4fwGoJ2JN3H3AMu7W 33/g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=VBTDOv0s73G2ldGV/G54jXUh1gLUlAQaCsANtQmAVfQ=; b=Z/n926etNKUdKi9jL8CowRxgLyKZ7OmfMOWD1PKuD/X/CwAlWfXXRYc2YF8Gc08t9K FWrFhj1DHnMN6kcIjiFazg2Ya8IWN1GePSJWoE26oEkyrhrylZ2DjmEv91eWpeJgOnwQ D0QJrbyYhncOoUSVV496shaVMJfE9OlFCXUbhrwDejCzJiBCljQILkOgnTvGcX/Ewrdg B4uj+Mh2JsQLkVvnDMpy+0lp7BzgKEfg4y3GV2Bghu4kutWOwZ6hjknZMQirmD1eQfm2 M4bOMXU7CKkdPG99vtobslZ0E62FW5aV9V9JOpYSpXtIq8MH85jKhc6qgZ3IS2FNUx1o zOGw== X-Gm-Message-State: AIkVDXJCSnNsb+LFRu1ZmBQF8Qz0hu3ZHFfowUX0R/G3HevrNUFyOg64nnRLeEmRjD259w== X-Received: by 10.99.138.201 with SMTP id y192mr5398868pgd.146.1484464274121; Sat, 14 Jan 2017 23:11:14 -0800 (PST) Received: from dtor-ws ([2620:0:1000:1311:f8fb:a506:df4d:51de]) by smtp.gmail.com with ESMTPSA id u29sm9280988pfl.17.2017.01.14.23.11.12 (version=TLS1_2 cipher=AES128-SHA bits=128/128); Sat, 14 Jan 2017 23:11:13 -0800 (PST) Date: Sat, 14 Jan 2017 23:11:10 -0800 From: Dmitry Torokhov To: Jaechul Lee Cc: Rob Herring , Mark Rutland , Catalin Marinas , Will Deacon , Kukjin Kim , Krzysztof Kozlowski , Javier Martinez Canillas , Andi Shyti , Chanwoo Choi , beomho.seo@samsung.com, galaxyra@gmail.com, linux-arm-kernel@lists.infradead.org, linux-input@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-samsung-soc@vger.kernel.org Subject: Re: [PATCH v6 2/3] input: tm2-touchkey: Add touchkey driver support for TM2 Message-ID: <20170115071110.GA24007@dtor-ws> References: <1483946535-4703-1-git-send-email-jcsing.lee@samsung.com> <1483946535-4703-3-git-send-email-jcsing.lee@samsung.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <1483946535-4703-3-git-send-email-jcsing.lee@samsung.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-samsung-soc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-samsung-soc@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Hi Jaechul, On Mon, Jan 09, 2017 at 04:22:14PM +0900, Jaechul Lee wrote: > +static irqreturn_t tm2_touchkey_irq_handler(int irq, void *devid) > +{ > + struct tm2_touchkey_data *touchkey = devid; > + u32 data; > + > + data = i2c_smbus_read_byte_data(touchkey->client, > + TM2_TOUCHKEY_KEYCODE_REG); > + > + if (data < 0) { You declared data as u32 so it will never be negative. > + dev_err(&touchkey->client->dev, "Failed to read i2c data\n"); > + return IRQ_HANDLED; > + } > + > + touchkey->keycode_type = data & TM2_TOUCHKEY_BIT_KEYCODE; > + touchkey->pressed = !(data & TM2_TOUCHKEY_BIT_PRESS_EV); There is no need to store this in touchkey structure as you are not going to use it past this function. Does the version of the patch below work for you? Thanks. diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig index cbd75cf44739..97acd6524ad7 100644 --- a/drivers/input/keyboard/Kconfig +++ b/drivers/input/keyboard/Kconfig @@ -666,6 +666,17 @@ config KEYBOARD_TC3589X To compile this driver as a module, choose M here: the module will be called tc3589x-keypad. +config KEYBOARD_TM2_TOUCHKEY + tristate "TM2 touchkey support" + depends on I2C + depends on LEDS_CLASS + help + Say Y here to enable device driver for tm2-touchkey with + LED control for the Exynos5433 TM2 board. + + To compile this driver as a module, choose M here. + module will be called tm2-touchkey. + config KEYBOARD_TWL4030 tristate "TI TWL4030/TWL5030/TPS659x0 keypad support" depends on TWL4030_CORE diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile index d9f4cfcf3410..7d9acff819a7 100644 --- a/drivers/input/keyboard/Makefile +++ b/drivers/input/keyboard/Makefile @@ -61,6 +61,7 @@ obj-$(CONFIG_KEYBOARD_SUN4I_LRADC) += sun4i-lradc-keys.o obj-$(CONFIG_KEYBOARD_SUNKBD) += sunkbd.o obj-$(CONFIG_KEYBOARD_TC3589X) += tc3589x-keypad.o obj-$(CONFIG_KEYBOARD_TEGRA) += tegra-kbc.o +obj-$(CONFIG_KEYBOARD_TM2_TOUCHKEY) += tm2-touchkey.o obj-$(CONFIG_KEYBOARD_TWL4030) += twl4030_keypad.o obj-$(CONFIG_KEYBOARD_XTKBD) += xtkbd.o obj-$(CONFIG_KEYBOARD_W90P910) += w90p910_keypad.o diff --git a/drivers/input/keyboard/tm2-touchkey.c b/drivers/input/keyboard/tm2-touchkey.c new file mode 100644 index 000000000000..79bc2d2bd4b9 --- /dev/null +++ b/drivers/input/keyboard/tm2-touchkey.c @@ -0,0 +1,286 @@ +/* + * TM2 touchkey device driver + * + * Copyright 2005 Phil Blundell + * Copyright 2016 Samsung Electronics Co., Ltd. + * + * Author: Beomho Seo + * Author: Jaechul Lee + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define TM2_TOUCHKEY_DEV_NAME "tm2-touchkey" +#define TM2_TOUCHKEY_KEYCODE_REG 0x03 +#define TM2_TOUCHKEY_BASE_REG 0x00 +#define TM2_TOUCHKEY_CMD_LED_ON 0x10 +#define TM2_TOUCHKEY_CMD_LED_OFF 0x20 +#define TM2_TOUCHKEY_BIT_PRESS_EV BIT(3) +#define TM2_TOUCHKEY_BIT_KEYCODE GENMASK(2, 0) +#define TM2_TOUCHKEY_LED_VOLTAGE_MIN 2500000 +#define TM2_TOUCHKEY_LED_VOLTAGE_MAX 3300000 + +enum { + TM2_TOUCHKEY_KEY_MENU = 0x1, + TM2_TOUCHKEY_KEY_BACK, +}; + +struct tm2_touchkey_data { + struct i2c_client *client; + struct input_dev *input_dev; + struct led_classdev led_dev; + struct regulator *vdd; + struct regulator_bulk_data regulators[2]; +}; + +static void tm2_touchkey_led_brightness_set(struct led_classdev *led_dev, + enum led_brightness brightness) +{ + struct tm2_touchkey_data *touchkey = + container_of(led_dev, struct tm2_touchkey_data, led_dev); + u32 volt; + u8 data; + + if (brightness == LED_OFF) { + volt = TM2_TOUCHKEY_LED_VOLTAGE_MIN; + data = TM2_TOUCHKEY_CMD_LED_OFF; + } else { + volt = TM2_TOUCHKEY_LED_VOLTAGE_MAX; + data = TM2_TOUCHKEY_CMD_LED_ON; + } + + regulator_set_voltage(touchkey->vdd, volt, volt); + i2c_smbus_write_byte_data(touchkey->client, + TM2_TOUCHKEY_BASE_REG, data); +} + +static int tm2_touchkey_power_enable(struct tm2_touchkey_data *touchkey) +{ + int error; + + error = regulator_bulk_enable(ARRAY_SIZE(touchkey->regulators), + touchkey->regulators); + if (error) + return error; + + /* waiting for device initialization, at least 150ms */ + msleep(150); + + return 0; +} + +static void tm2_touchkey_power_disable(void *data) +{ + struct tm2_touchkey_data *touchkey = data; + + regulator_bulk_disable(ARRAY_SIZE(touchkey->regulators), + touchkey->regulators); +} + +static irqreturn_t tm2_touchkey_irq_handler(int irq, void *devid) +{ + struct tm2_touchkey_data *touchkey = devid; + int data; + int key; + + data = i2c_smbus_read_byte_data(touchkey->client, + TM2_TOUCHKEY_KEYCODE_REG); + if (data < 0) { + dev_err(&touchkey->client->dev, + "failed to read i2c data: %d\n", data); + goto out; + } + + switch (data & TM2_TOUCHKEY_BIT_KEYCODE) { + case TM2_TOUCHKEY_KEY_MENU: + key = KEY_PHONE; + break; + + case TM2_TOUCHKEY_KEY_BACK: + key = KEY_BACK; + break; + + default: + dev_warn(&touchkey->client->dev, + "unhandled keycode, data %#02x\n", data); + goto out; + } + + if (data & TM2_TOUCHKEY_BIT_PRESS_EV) { + input_report_key(touchkey->input_dev, key, 1); + } else { + input_report_key(touchkey->input_dev, KEY_PHONE, 0); + input_report_key(touchkey->input_dev, KEY_BACK, 0); + } + + input_sync(touchkey->input_dev); + +out: + return IRQ_HANDLED; +} + +static int tm2_touchkey_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct tm2_touchkey_data *touchkey; + int error; + + if (!i2c_check_functionality(client->adapter, + I2C_FUNC_SMBUS_BYTE | I2C_FUNC_SMBUS_BYTE_DATA)) { + dev_err(&client->dev, "incompatible I2C adapter\n"); + return -EIO; + } + + touchkey = devm_kzalloc(&client->dev, sizeof(*touchkey), GFP_KERNEL); + if (!touchkey) + return -ENOMEM; + + touchkey->client = client; + i2c_set_clientdata(client, touchkey); + + touchkey->regulators[0].supply = "vcc"; + touchkey->regulators[1].supply = "vdd"; + error = devm_regulator_bulk_get(&client->dev, + ARRAY_SIZE(touchkey->regulators), + touchkey->regulators); + if (error) { + dev_err(&client->dev, "failed to get regulators: %d\n", error); + return error; + } + + /* Save VDD for easy access */ + touchkey->vdd = touchkey->regulators[1].consumer; + + error = tm2_touchkey_power_enable(touchkey); + if (error) { + dev_err(&client->dev, "failed to power up device: %d\n", error); + return error; + } + + error = devm_add_action_or_reset(&client->dev, + tm2_touchkey_power_disable, touchkey); + if (error) { + dev_err(&client->dev, + "failed to install poweroff handler: %d\n", error); + return error; + } + + /* input device */ + touchkey->input_dev = devm_input_allocate_device(&client->dev); + if (!touchkey->input_dev) { + dev_err(&client->dev, "failed to allocate input device\n"); + return -ENOMEM; + } + + touchkey->input_dev->name = TM2_TOUCHKEY_DEV_NAME; + touchkey->input_dev->id.bustype = BUS_I2C; + + input_set_capability(touchkey->input_dev, EV_KEY, KEY_PHONE); + input_set_capability(touchkey->input_dev, EV_KEY, KEY_BACK); + + input_set_drvdata(touchkey->input_dev, touchkey); + + error = input_register_device(touchkey->input_dev); + if (error) { + dev_err(&client->dev, + "failed to register input device: %d\n", error); + return error; + } + + error = devm_request_threaded_irq(&client->dev, client->irq, + NULL, tm2_touchkey_irq_handler, + IRQF_ONESHOT, + TM2_TOUCHKEY_DEV_NAME, touchkey); + if (error) { + dev_err(&client->dev, + "failed to request threaded irq: %d\n", error); + return error; + } + + /* led device */ + touchkey->led_dev.name = TM2_TOUCHKEY_DEV_NAME; + touchkey->led_dev.brightness = LED_FULL; + touchkey->led_dev.max_brightness = LED_FULL; + touchkey->led_dev.brightness_set = tm2_touchkey_led_brightness_set; + + error = devm_led_classdev_register(&client->dev, &touchkey->led_dev); + if (error) { + dev_err(&client->dev, + "failed to register touchkey led: %d\n", error); + return error; + } + + return 0; +} + +static int __maybe_unused tm2_touchkey_suspend(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + struct tm2_touchkey_data *touchkey = i2c_get_clientdata(client); + + disable_irq(client->irq); + tm2_touchkey_power_disable(touchkey); + + return 0; +} + +static int __maybe_unused tm2_touchkey_resume(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + struct tm2_touchkey_data *touchkey = i2c_get_clientdata(client); + int ret; + + enable_irq(client->irq); + + ret = tm2_touchkey_power_enable(touchkey); + if (ret) + dev_err(dev, "failed to enable power: %d\n", ret); + + return ret; +} + +static SIMPLE_DEV_PM_OPS(tm2_touchkey_pm_ops, + tm2_touchkey_suspend, tm2_touchkey_resume); + +static const struct i2c_device_id tm2_touchkey_id_table[] = { + { TM2_TOUCHKEY_DEV_NAME, 0 }, + { }, +}; +MODULE_DEVICE_TABLE(i2c, tm2_touchkey_id_table); + +static const struct of_device_id tm2_touchkey_of_match[] = { + { .compatible = "cypress,tm2-touchkey", }, + { }, +}; +MODULE_DEVICE_TABLE(of, tm2_touchkey_of_match); + +static struct i2c_driver tm2_touchkey_driver = { + .driver = { + .name = TM2_TOUCHKEY_DEV_NAME, + .pm = &tm2_touchkey_pm_ops, + .of_match_table = of_match_ptr(tm2_touchkey_of_match), + }, + .probe = tm2_touchkey_probe, + .id_table = tm2_touchkey_id_table, +}; +module_i2c_driver(tm2_touchkey_driver); + +MODULE_AUTHOR("Beomho Seo "); +MODULE_AUTHOR("Jaechul Lee "); +MODULE_DESCRIPTION("Samsung touchkey driver"); +MODULE_LICENSE("GPL v2");