From patchwork Wed Sep 13 13:25:30 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stephan Gerhold X-Patchwork-Id: 13383012 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8B026EDEC4D for ; Wed, 13 Sep 2023 13:28:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240877AbjIMN2p (ORCPT ); Wed, 13 Sep 2023 09:28:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45348 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230414AbjIMN2o (ORCPT ); Wed, 13 Sep 2023 09:28:44 -0400 X-Greylist: delayed 169 seconds by postgrey-1.37 at lindbergh.monkeyblade.net; Wed, 13 Sep 2023 06:28:40 PDT Received: from mo4-p02-ob.smtp.rzone.de (mo4-p02-ob.smtp.rzone.de [85.215.255.83]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9C63919B1 for ; Wed, 13 Sep 2023 06:28:40 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1694611536; cv=none; d=strato.com; s=strato-dkim-0002; b=l3hfFRLyibFhEuW9OpRfcws3Ec2jzQMbOuXyJoBmvJQCQR4N6xs0MQKwJKOm40vYm3 q5m5/yJdrM6FvX9TvC7vfL2I3E1BCTvrNKRPWGNbJAbu9aeMLzrzO6hzf9JBIDm1M8ev e0qb0v9VQvQu9rlts4xUEu6uQ5Yp0MxQG635APayMgSk6YC3jn5N+my5aIg1ltJZ4b1H gB55+l9QeCP7yWmOoOZW8+uzb+lKQRPjA3o1dQImdthyMzyo9Mh6tmiC056gQeIjDwGV yUaAnPzhGEasGBk6SujCGDipjvK+QE+VshwzZa5M3mpGt1GWoIifCr4ZQ1PqvERLE982 wx/g== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; t=1694611536; s=strato-dkim-0002; d=strato.com; h=Cc:To:In-Reply-To:References:Message-Id:Subject:Date:From:Cc:Date: From:Subject:Sender; bh=KbERBedIAL9gJMwHNNvEPbEjgaw3ZpkKu/H1aSpvxt4=; b=kRGQEqlkX6UoWqfUeI5KyzyMVc0D9GvYH+IAwNZa77f1FahhANDS40li+iJMG4lqfX 7ClXIceSoqXKRjUL1Ms6DZuJYWuAR3WS8i7xQtCL/AzH+A3OI2SLF6QnFzHP7KwwVMD3 moQRbDkmGCHvRRMQyue1LoCV3NSQtJsb2ZorL8KC/+0nsqIFEAVJfOc0lhOIUDPWFMGj 0T6rmnTdtLqLZS+WQeK4xlSOU/D65QNOww1qNG7TnPZvPM/o0svYlvxIzn0MpuT/1aoV htKqCQE9L0iYGIFVWDaKRObgaxxvxj9eIjZzldMbW2ryNjDlwLPWpwTEtSXAepkSYV4t lWIA== ARC-Authentication-Results: i=1; strato.com; arc=none; dkim=none X-RZG-CLASS-ID: mo02 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; t=1694611536; s=strato-dkim-0002; d=gerhold.net; h=Cc:To:In-Reply-To:References:Message-Id:Subject:Date:From:Cc:Date: From:Subject:Sender; bh=KbERBedIAL9gJMwHNNvEPbEjgaw3ZpkKu/H1aSpvxt4=; b=dUzpsTm3sNhDr0S2O6Ok42yFtFzpHmsq6L1v2EOvZVaLRvxaRVtYy5CB006vfHSRt4 M0knqE6p015n7xSfNzJcZHx0ZnZbQJlnOoA8/g9+udIvOO+14KTFDhmlAaWlSwUFTOsb GGFKAFZYbnZWClhFNzeZtWAtLlqGATRixky483SJ5m+Z7/GG6HvaJBe0Nl/42juO6LJS vHZSDwdLpciWwU7IkUwyqZqkGPf2PeiMBNwA14NZJiJ2wcHtYUQLOGrfJjzU3RNFMbEV +Lyu3e0bBPLb/cxOJrCOj9OhvHnJWrze/NcOIV51stGUB2/U46YMmBfQqYbXJhYqI8P3 +dSw== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; t=1694611536; s=strato-dkim-0003; d=gerhold.net; h=Cc:To:In-Reply-To:References:Message-Id:Subject:Date:From:Cc:Date: From:Subject:Sender; bh=KbERBedIAL9gJMwHNNvEPbEjgaw3ZpkKu/H1aSpvxt4=; b=j8Jg7twdJVRzCvPq28PmQODphK2dpew1hxnkPO4JCNJf0S3hmlxLG1cWYTB7ot6s5y 5n9M5SRgUZ6dsK0dqHBQ== X-RZG-AUTH: ":P3gBZUipdd93FF5ZZvYFPugejmSTVR2nRPhVOQjVd4CteZ/7jYgS+mLFY+H0JAn8u4p3mw==" Received: from [192.168.244.3] by smtp.strato.de (RZmta 49.8.2 DYNA|AUTH) with ESMTPSA id xb560bz8DDPauEJ (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256 bits)) (Client did not present a certificate); Wed, 13 Sep 2023 15:25:36 +0200 (CEST) From: Stephan Gerhold Date: Wed, 13 Sep 2023 15:25:30 +0200 Subject: [PATCH 2/2] Input: add Himax HX852x(ES) touchscreen driver MIME-Version: 1.0 Message-Id: <20230913-hx852x-v1-2-9c1ebff536eb@gerhold.net> References: <20230913-hx852x-v1-0-9c1ebff536eb@gerhold.net> In-Reply-To: <20230913-hx852x-v1-0-9c1ebff536eb@gerhold.net> To: Dmitry Torokhov Cc: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Henrik Rydberg , linux-input@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Jeff LaBundy , Jonathan Albrieux , Stephan Gerhold X-Mailer: b4 0.12.3 Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org From: Jonathan Albrieux Add a simple driver for the Himax HX852x(ES) touch panel controller, with support for multi-touch and capacitive touch keys. The driver is somewhat based on sample code from Himax. However, that code was so extremely confusing that we spent a significant amount of time just trying to understand the packet format and register commands. In this driver they are described with clean structs and defines rather than lots of magic numbers and offset calculations. Signed-off-by: Jonathan Albrieux Co-developed-by: Stephan Gerhold Signed-off-by: Stephan Gerhold --- MAINTAINERS | 7 + drivers/input/touchscreen/Kconfig | 10 + drivers/input/touchscreen/Makefile | 1 + drivers/input/touchscreen/himax_hx852x.c | 491 +++++++++++++++++++++++++++++++ 4 files changed, 509 insertions(+) diff --git a/MAINTAINERS b/MAINTAINERS index 90f13281d297..c551c60b0598 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -9331,6 +9331,13 @@ S: Maintained F: Documentation/devicetree/bindings/input/touchscreen/himax,hx83112b.yaml F: drivers/input/touchscreen/himax_hx83112b.c +HIMAX HX852X TOUCHSCREEN DRIVER +M: Stephan Gerhold +L: linux-input@vger.kernel.org +S: Maintained +F: Documentation/devicetree/bindings/input/touchscreen/himax,hx852es.yaml +F: drivers/input/touchscreen/himax_hx852x.c + HIPPI M: Jes Sorensen L: linux-hippi@sunsite.dk diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig index e3e2324547b9..8e5667ae5dab 100644 --- a/drivers/input/touchscreen/Kconfig +++ b/drivers/input/touchscreen/Kconfig @@ -427,6 +427,16 @@ config TOUCHSCREEN_HIDEEP To compile this driver as a module, choose M here : the module will be called hideep_ts. +config TOUCHSCREEN_HIMAX_HX852X + tristate "Himax HX852x(ES) touchscreen" + depends on I2C + help + Say Y here if you have a Himax HX852x(ES) touchscreen. + If unsure, say N. + + To compile this driver as a module, choose M here: the module + will be called himax_hx852x. + config TOUCHSCREEN_HYCON_HY46XX tristate "Hycon hy46xx touchscreen support" depends on I2C diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile index 62bd24f3ac8e..f42a87faa86c 100644 --- a/drivers/input/touchscreen/Makefile +++ b/drivers/input/touchscreen/Makefile @@ -48,6 +48,7 @@ obj-$(CONFIG_TOUCHSCREEN_EXC3000) += exc3000.o obj-$(CONFIG_TOUCHSCREEN_FUJITSU) += fujitsu_ts.o obj-$(CONFIG_TOUCHSCREEN_GOODIX) += goodix_ts.o obj-$(CONFIG_TOUCHSCREEN_HIDEEP) += hideep.o +obj-$(CONFIG_TOUCHSCREEN_HIMAX_HX852X) += himax_hx852x.o obj-$(CONFIG_TOUCHSCREEN_HYNITRON_CSTXXX) += hynitron_cstxxx.o obj-$(CONFIG_TOUCHSCREEN_ILI210X) += ili210x.o obj-$(CONFIG_TOUCHSCREEN_ILITEK) += ilitek_ts_i2c.o diff --git a/drivers/input/touchscreen/himax_hx852x.c b/drivers/input/touchscreen/himax_hx852x.c new file mode 100644 index 000000000000..31616dcfc5ab --- /dev/null +++ b/drivers/input/touchscreen/himax_hx852x.c @@ -0,0 +1,491 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Himax HX852x(ES) Touchscreen Driver + * Copyright (c) 2020-2023 Stephan Gerhold + * Copyright (c) 2020 Jonathan Albrieux + * + * Based on the Himax Android Driver Sample Code Ver 0.3 for HMX852xES chipset: + * Copyright (c) 2014 Himax Corporation. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define HX852X_COORD_SIZE(fingers) ((fingers) * sizeof(struct hx852x_coord)) +#define HX852X_WIDTH_SIZE(fingers) ALIGN(fingers, 4) +#define HX852X_BUF_SIZE(fingers) (HX852X_COORD_SIZE(fingers) + \ + HX852X_WIDTH_SIZE(fingers) + \ + sizeof(struct hx852x_touch_info)) + +#define HX852X_MAX_FINGERS 12 +#define HX852X_MAX_KEY_COUNT 4 +#define HX852X_MAX_BUF_SIZE HX852X_BUF_SIZE(HX852X_MAX_FINGERS) + +#define HX852X_TS_SLEEP_IN 0x80 +#define HX852X_TS_SLEEP_OUT 0x81 +#define HX852X_TS_SENSE_OFF 0x82 +#define HX852X_TS_SENSE_ON 0x83 +#define HX852X_READ_ONE_EVENT 0x85 +#define HX852X_READ_ALL_EVENTS 0x86 +#define HX852X_READ_LATEST_EVENT 0x87 +#define HX852X_CLEAR_EVENT_STACK 0x88 + +#define HX852X_REG_SRAM_SWITCH 0x8c +#define HX852X_REG_SRAM_ADDR 0x8b +#define HX852X_REG_FLASH_RPLACE 0x5a + +#define HX852X_SRAM_SWITCH_TEST_MODE 0x14 +#define HX852X_SRAM_ADDR_CONFIG 0x7000 + +struct hx852x { + struct i2c_client *client; + struct input_dev *input_dev; + struct touchscreen_properties props; + + struct gpio_desc *reset_gpiod; + struct regulator_bulk_data supplies[2]; + + unsigned int max_fingers; + unsigned int keycount; + u32 keycodes[HX852X_MAX_KEY_COUNT]; +}; + +struct hx852x_config { + u8 rx_num; + u8 tx_num; + u8 max_pt; + u8 padding1[3]; + __be16 x_res; + __be16 y_res; + u8 padding2[2]; +} __packed __aligned(4); + +struct hx852x_coord { + __be16 x; + __be16 y; +} __packed __aligned(4); + +struct hx852x_touch_info { + u8 finger_num; + __le16 finger_pressed; + u8 padding; +} __packed __aligned(4); + +static int hx852x_i2c_read(struct hx852x *hx, u8 cmd, void *data, u16 len) +{ + struct i2c_client *client = hx->client; + int ret; + + struct i2c_msg msg[] = { + { + .addr = client->addr, + .flags = 0, + .len = 1, + .buf = &cmd, + }, + { + .addr = client->addr, + .flags = I2C_M_RD, + .len = len, + .buf = data, + } + }; + + ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg)); + if (ret != ARRAY_SIZE(msg)) { + dev_err(&client->dev, "failed to read %#x: %d\n", cmd, ret); + return ret; + } + + return 0; +} + +static int hx852x_power_on(struct hx852x *hx) +{ + struct device *dev = &hx->client->dev; + int error; + + error = regulator_bulk_enable(ARRAY_SIZE(hx->supplies), hx->supplies); + if (error < 0) { + dev_err(dev, "failed to enable regulators: %d\n", error); + return error; + } + + gpiod_set_value_cansleep(hx->reset_gpiod, 1); + msleep(20); + gpiod_set_value_cansleep(hx->reset_gpiod, 0); + msleep(20); + + return 0; +} + +static int hx852x_start(struct hx852x *hx) +{ + struct device *dev = &hx->client->dev; + int error; + + error = i2c_smbus_write_byte(hx->client, HX852X_TS_SLEEP_OUT); + if (error) { + dev_err(dev, "failed to send TS_SLEEP_OUT: %d\n", error); + return error; + } + msleep(30); + + error = i2c_smbus_write_byte(hx->client, HX852X_TS_SENSE_ON); + if (error) { + dev_err(dev, "failed to send TS_SENSE_ON: %d\n", error); + return error; + } + msleep(20); + + return 0; +} + +static void hx852x_stop(struct hx852x *hx) +{ + struct device *dev = &hx->client->dev; + int error; + + error = i2c_smbus_write_byte(hx->client, HX852X_TS_SENSE_OFF); + if (error) + dev_err(dev, "failed to send TS_SENSE_OFF: %d\n", error); + + msleep(20); + + error = i2c_smbus_write_byte(hx->client, HX852X_TS_SLEEP_IN); + if (error) + dev_err(dev, "failed to send TS_SLEEP_IN: %d\n", error); + + msleep(30); +} + +static void hx852x_power_off(struct hx852x *hx) +{ + struct device *dev = &hx->client->dev; + int error; + + error = regulator_bulk_disable(ARRAY_SIZE(hx->supplies), hx->supplies); + if (error) + dev_err(dev, "failed to disable regulators: %d\n", error); +} + +static int hx852x_read_config(struct hx852x *hx) +{ + struct device *dev = &hx->client->dev; + struct hx852x_config conf = {0}; + int x_res, y_res; + int error; + + error = hx852x_power_on(hx); + if (error) + return error; + + /* Sensing must be turned on briefly to load the config */ + error = hx852x_start(hx); + if (error) + goto power_off; + + hx852x_stop(hx); + + error = i2c_smbus_write_byte_data(hx->client, HX852X_REG_SRAM_SWITCH, + HX852X_SRAM_SWITCH_TEST_MODE); + if (error) + goto power_off; + + error = i2c_smbus_write_word_data(hx->client, HX852X_REG_SRAM_ADDR, + HX852X_SRAM_ADDR_CONFIG); + if (error) + goto exit_test_mode; + + error = hx852x_i2c_read(hx, HX852X_REG_FLASH_RPLACE, &conf, sizeof(conf)); + if (error) + goto exit_test_mode; + + x_res = be16_to_cpu(conf.x_res); + y_res = be16_to_cpu(conf.y_res); + hx->max_fingers = (conf.max_pt & 0xf0) >> 4; + dev_dbg(dev, "x res: %d, y res: %d, max fingers: %d\n", + x_res, y_res, hx->max_fingers); + + if (hx->max_fingers > HX852X_MAX_FINGERS) { + dev_err(dev, "max supported fingers: %d, found: %d\n", + HX852X_MAX_FINGERS, hx->max_fingers); + error = -EINVAL; + goto exit_test_mode; + } + + if (x_res && y_res) { + input_set_abs_params(hx->input_dev, ABS_MT_POSITION_X, 0, x_res - 1, 0, 0); + input_set_abs_params(hx->input_dev, ABS_MT_POSITION_Y, 0, y_res - 1, 0, 0); + } + +exit_test_mode: + i2c_smbus_write_byte_data(hx->client, HX852X_REG_SRAM_SWITCH, 0); +power_off: + hx852x_power_off(hx); + return error; +} + +static int hx852x_handle_events(struct hx852x *hx) +{ + /* + * The event packets have variable size, depending on the amount of + * supported fingers (hx->max_fingers). They are laid out as follows: + * - struct hx852x_coord[hx->max_fingers]: Coordinates for each finger + * - u8[ALIGN(hx->max_fingers, 4)]: Touch width for each finger + * with padding for 32-bit alignment + * - struct hx852x_touch_info + * + * Load everything into a 32-bit aligned buffer so the coordinates + * can be assigned directly, without using get_unaligned_*(). + */ + u8 buf[HX852X_MAX_BUF_SIZE] __aligned(4); + struct hx852x_coord *coord = (struct hx852x_coord *)buf; + u8 *width = &buf[HX852X_COORD_SIZE(hx->max_fingers)]; + struct hx852x_touch_info *info = (struct hx852x_touch_info *) + &width[HX852X_WIDTH_SIZE(hx->max_fingers)]; + unsigned long finger_pressed, key_pressed; + unsigned int i, x, y, w; + int error; + + error = hx852x_i2c_read(hx, HX852X_READ_ALL_EVENTS, buf, + HX852X_BUF_SIZE(hx->max_fingers)); + if (error) + return error; + + finger_pressed = get_unaligned_le16(&info->finger_pressed); + key_pressed = finger_pressed >> HX852X_MAX_FINGERS; + + /* All bits are set when no touch is detected */ + if (info->finger_num == 0xff || !(info->finger_num & 0x0f)) + finger_pressed = 0; + if (key_pressed == 0xf) + key_pressed = 0; + + for_each_set_bit(i, &finger_pressed, hx->max_fingers) { + x = be16_to_cpu(coord[i].x); + y = be16_to_cpu(coord[i].y); + w = width[i]; + + input_mt_slot(hx->input_dev, i); + input_mt_report_slot_state(hx->input_dev, MT_TOOL_FINGER, 1); + touchscreen_report_pos(hx->input_dev, &hx->props, x, y, true); + input_report_abs(hx->input_dev, ABS_MT_TOUCH_MAJOR, w); + } + input_mt_sync_frame(hx->input_dev); + + for (i = 0; i < hx->keycount; i++) + input_report_key(hx->input_dev, hx->keycodes[i], key_pressed & BIT(i)); + + input_sync(hx->input_dev); + return 0; +} + +static irqreturn_t hx852x_interrupt(int irq, void *ptr) +{ + struct hx852x *hx = ptr; + int error; + + error = hx852x_handle_events(hx); + if (error) { + dev_err(&hx->client->dev, "failed to handle events: %d\n", error); + return IRQ_NONE; + } + + return IRQ_HANDLED; +} + +static int hx852x_input_open(struct input_dev *dev) +{ + struct hx852x *hx = input_get_drvdata(dev); + int error; + + error = hx852x_power_on(hx); + if (error) + return error; + + error = hx852x_start(hx); + if (error) { + hx852x_power_off(hx); + return error; + } + + enable_irq(hx->client->irq); + return 0; +} + +static void hx852x_input_close(struct input_dev *dev) +{ + struct hx852x *hx = input_get_drvdata(dev); + + hx852x_stop(hx); + disable_irq(hx->client->irq); + hx852x_power_off(hx); +} + +static int hx852x_parse_properties(struct hx852x *hx) +{ + struct device *dev = &hx->client->dev; + int error; + + hx->keycount = device_property_count_u32(dev, "linux,keycodes"); + if (hx->keycount <= 0) { + hx->keycount = 0; + return 0; + } + + if (hx->keycount > HX852X_MAX_KEY_COUNT) { + dev_err(dev, "max supported keys: %d, found: %d\n", + HX852X_MAX_KEY_COUNT, hx->keycount); + return -EINVAL; + } + + error = device_property_read_u32_array(dev, "linux,keycodes", + hx->keycodes, hx->keycount); + if (error) + dev_err(dev, "failed to read linux,keycodes: %d\n", error); + + return error; +} + +static int hx852x_probe(struct i2c_client *client) +{ + struct device *dev = &client->dev; + struct hx852x *hx; + int error, i; + + if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C | + I2C_FUNC_SMBUS_WRITE_BYTE | + I2C_FUNC_SMBUS_WRITE_BYTE_DATA | + I2C_FUNC_SMBUS_WRITE_WORD_DATA)) { + dev_err(dev, "not all i2c functionality supported\n"); + return -ENXIO; + } + + hx = devm_kzalloc(dev, sizeof(*hx), GFP_KERNEL); + if (!hx) + return -ENOMEM; + + hx->client = client; + hx->input_dev = devm_input_allocate_device(dev); + if (!hx->input_dev) + return -ENOMEM; + + hx->input_dev->name = "Himax HX852x"; + hx->input_dev->id.bustype = BUS_I2C; + hx->input_dev->open = hx852x_input_open; + hx->input_dev->close = hx852x_input_close; + + i2c_set_clientdata(client, hx); + input_set_drvdata(hx->input_dev, hx); + + hx->supplies[0].supply = "vcca"; + hx->supplies[1].supply = "vccd"; + error = devm_regulator_bulk_get(dev, ARRAY_SIZE(hx->supplies), hx->supplies); + if (error < 0) + return dev_err_probe(dev, error, "failed to get regulators"); + + hx->reset_gpiod = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH); + if (IS_ERR(hx->reset_gpiod)) + return dev_err_probe(dev, error, "failed to get reset gpio"); + + error = devm_request_threaded_irq(dev, client->irq, NULL, hx852x_interrupt, + IRQF_ONESHOT | IRQF_NO_AUTOEN, NULL, hx); + if (error) { + dev_err(dev, "failed to request irq %d: %d\n", client->irq, error); + return error; + } + + error = hx852x_read_config(hx); + if (error) + return error; + + input_set_capability(hx->input_dev, EV_ABS, ABS_MT_POSITION_X); + input_set_capability(hx->input_dev, EV_ABS, ABS_MT_POSITION_Y); + input_set_abs_params(hx->input_dev, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0); + + touchscreen_parse_properties(hx->input_dev, true, &hx->props); + error = hx852x_parse_properties(hx); + if (error) + return error; + + hx->input_dev->keycode = hx->keycodes; + hx->input_dev->keycodemax = hx->keycount; + hx->input_dev->keycodesize = sizeof(hx->keycodes[0]); + for (i = 0; i < hx->keycount; i++) + input_set_capability(hx->input_dev, EV_KEY, hx->keycodes[i]); + + error = input_mt_init_slots(hx->input_dev, hx->max_fingers, + INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED); + if (error) { + dev_err(dev, "failed to init MT slots: %d\n", error); + return error; + } + + error = input_register_device(hx->input_dev); + if (error) { + dev_err(dev, "failed to register input device: %d\n", error); + return error; + } + + return 0; +} + +static int hx852x_suspend(struct device *dev) +{ + struct hx852x *hx = dev_get_drvdata(dev); + + mutex_lock(&hx->input_dev->mutex); + if (input_device_enabled(hx->input_dev)) + hx852x_stop(hx); + mutex_unlock(&hx->input_dev->mutex); + + return 0; +} + +static int hx852x_resume(struct device *dev) +{ + struct hx852x *hx = dev_get_drvdata(dev); + int error = 0; + + mutex_lock(&hx->input_dev->mutex); + if (input_device_enabled(hx->input_dev)) + error = hx852x_start(hx); + mutex_unlock(&hx->input_dev->mutex); + + return error; +} + +static DEFINE_SIMPLE_DEV_PM_OPS(hx852x_pm_ops, hx852x_suspend, hx852x_resume); + +#ifdef CONFIG_OF +static const struct of_device_id hx852x_of_match[] = { + { .compatible = "himax,hx852es" }, + { } +}; +MODULE_DEVICE_TABLE(of, hx852x_of_match); +#endif + +static struct i2c_driver hx852x_driver = { + .probe = hx852x_probe, + .driver = { + .name = "himax_hx852x", + .pm = pm_sleep_ptr(&hx852x_pm_ops), + .of_match_table = of_match_ptr(hx852x_of_match), + }, +}; +module_i2c_driver(hx852x_driver); + +MODULE_DESCRIPTION("Himax HX852x(ES) Touchscreen Driver"); +MODULE_AUTHOR("Jonathan Albrieux "); +MODULE_AUTHOR("Stephan Gerhold "); +MODULE_LICENSE("GPL");