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Fri, 10 Feb 2017 11:17:29 +0900 (KST) Received: from epcpsbgm1new.samsung.com (u26.gpu120.samsung.co.kr [203.254.230.26]) by epcas1p3.samsung.com (KnoxPortal) with ESMTP id 20170210021729epcas1p3e11cade2daa21d2dd23839975e29acb6~hy3OOxlMa0614506145epcas1p38; Fri, 10 Feb 2017 02:17:29 +0000 (GMT) X-AuditID: b6c32a36-f79dd6d000001a4f-86-589d22b9dbf9 Received: from epmmp1.local.host ( [203.254.227.16]) by epcpsbgm1new.samsung.com (EPCPMTA) with SMTP id EC.53.06487.9B22D985; Fri, 10 Feb 2017 11:17:29 +0900 (KST) Received: from gangnam.samsung ([10.113.62.47]) by mmp1.samsung.com (Oracle Communications Messaging Server 7.0.5.31.0 64bit (built May 5 2014)) with ESMTPA id <0OL40065DZP0R1B0@mmp1.samsung.com>; Fri, 10 Feb 2017 11:17:28 +0900 (KST) From: Andi Shyti To: Dmitry Torokhov , Krzysztof Kozlowski , Rob Herring , Chanwoo Choi , Javier Martinez Canillas Cc: linux-input@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-samsung-soc@vger.kernel.org, Andi Shyti , Andi Shyti Subject: [PATCH v2 2/3] Input: add support for the STMicroelectronics FingerTip touchscreen Date: Fri, 10 Feb 2017 11:17:20 +0900 Message-id: <20170210021721.12218-3-andi.shyti@samsung.com> X-Mailer: git-send-email 2.11.0 In-reply-to: <20170210021721.12218-1-andi.shyti@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAAzVSa0hTYRju29nZjtnkMG19rIt2KknBtXOaekqNpNvCflj9sYvZYX6ouBs7 0zSoRNTKLGfQBS8ls4hWaum8Vlq6yqDSCFkpakFpmRZpmRBJm2f+e57vfd7nfd6Pl8DkQ7iS yDBakcXI6SnJYnFzd5gqoo2qSlLbLynYFtcoztbMjolY968xnL3ueo2z3fYvgJ2YvCtie3vv Sdn3UzM4+7a9UsJe7e0QsYWPXNKt/lr3jSlM21Y+JNU2OM5KtM5SD7rgdADtdMOqRMlBFJuO uFRkCUFGnSk1w5gWRyXsT9mWEhmlpiPoTWw0FWLkDCiO2r4nMWJnht6TjwrJ5vRZnqdEjuep DVtiLaYsKwpJN/HWOOoQTTMqWh2tYhhGpdmYvJmJ9EiOovSKf08xc+FDkOMoqQF5oL0cFAM/ ApIaOHJ7VCpgBewbrpcUg8WEnGwF8JztOS6Q0yL4rKhHvNBRMXzRp7oF4I+J80AgPwGcHJyb 95WQYTB/cHZeFUT2A/iy2y3xFjDSBeBlZ44XB5LJsK1qQOTFYnIdLKxtxLxYRsbAp+M9voDB sL3oDe7FfmQsLO6xzWeC5BUpbLLXeQjhISthw2NM0G+Hro6PvqiBcPy507fccuiYE2ZB8his fdIiEnwKAPz7tV8iFDbCkQ/DmBA0AH7/XeLzl8EzRXJBooVND276/ONhSf5lqbB9KYB3pvIw G1hRDRY5gAKZeUMa4mkzo+I5A59lTFPpTIYGMH9a4VGtwP56TxcgCUAtkdmOVybJcS6bzzV0 AUhgVJDMoKxKkstSudzjyGJKsWTpEd8FIj3/VIYpl+pMnkM1WlNoTRStYTQ0Hc2oGWqZDFeX JcnJNM6KMhEyI8tCn4jwU+aB9a8+ye26G1eaufv4ruBLE1GK3Z1EfM671lMx9YrOgIoTQ0fI 8YSTjxW2+upOc6r4G1x9232/1PJ5jHceXlNuDG3M3lHmF1wdXa6cHhiR9j3bF3jXsGPmxe/m a/4lG0JLT6zt0Da2o74CNlNd9qfonijml79tW6DuwN5au7wuIJcS8+kcHY5ZeO4/0Th7EXAD AAA= X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFupkkeLIzCtJLcpLzFFi42I5/e+xgO5OpbkRBtc+clhsP/KM1WLxj+dM Fte/PGe1mH/kHKvF4UUvGC3evF3DZHH+/AZ2i5ufvrFaXN41h81ixvl9TBate4+wO3B7XF/y idlj56y77B6bVnWyeWzpB7L6tqxi9Pi8SS6ALcrNJiM1MSW1SCE1Lzk/JTMv3VYpNMRN10JJ IS8xN9VWKULXNyRISaEsMacUyDMyQAMOzgHuwUr6dgluGbP/HmUuaN3DWLGqZzFjA+OuWYxd jJwcEgImErPvTWKDsMUkLtxbD2RzcQgJLGWUWPxoAROE85FR4trdzWAdbAKaEk23f4BViQhc Z5R41LmEBcRhFjjCKPH8eD9QFQeHsECsxI1/XCANLAKqEq1rNzOD2LwC1hJHX52AWi0vsavt IiuIzSlgI9F1YgKYLQRU8+nxD8YJjLwLGBlWMUqkFiQXFCel5xrmpZbrFSfmFpfmpesl5+du YgRHwzOpHYwHd7kfYhTgYFTi4Z1QNSdCiDWxrLgy9xCjBAezkghvrtTcCCHelMTKqtSi/Pii 0pzU4kOMpkCHTWSWEk3OB0ZqXkm8oYm5ibmxgYW5paWJkZI4b+PsZ+FCAumJJanZqakFqUUw fUwcnFINjMfZ/adxN7Cnn1PseWjIxHjuRRLTsQ67iP1mV8w6L/3iDeVpsWCp4w61LtJ/sN22 abdn+NSU/Aef/D0XPjXX5fq4gHklf8f8a2GuWcbJlqyr7htOFE+fuPGN7aKvG6UK+UvEhDv+ tt9TqrSsiebvC3n/7XGgRXTG2kTXla8u7ec9ek364yxDJZbijERDLeai4kQA3Mf9jZwCAAA= X-MTR: 20000000000000000@CPGS X-CMS-MailID: 20170210021729epcas1p3e11cade2daa21d2dd23839975e29acb6 X-Msg-Generator: CA X-Sender-IP: 203.254.230.26 X-Local-Sender: =?UTF-8?B?7JWI65SUG1RpemVuIFBsYXRmb3JtIExhYihTL1fshLzthLAp?= =?UTF-8?B?G+yCvOyEseyghOyekBvssYXsnoQ=?= X-Global-Sender: =?UTF-8?B?QW5kaSBTaHl0aRtUaXplbiBQbGF0Zm9ybSBMYWIuG1NhbXN1?= =?UTF-8?B?bmcgRWxlY3Ryb25pY3MbU2VuaW9yIEVuZ2luZWVy?= X-Sender-Code: =?UTF-8?B?QzEwG1NUQUYbQzEwVjgxMTE=?= CMS-TYPE: 101P DLP-Filter: Pass X-CFilter-Loop: Reflected X-HopCount: 7 X-CMS-RootMailID: 20170210021729epcas1p3e11cade2daa21d2dd23839975e29acb6 X-RootMTR: 20170210021729epcas1p3e11cade2daa21d2dd23839975e29acb6 References: <20170210021721.12218-1-andi.shyti@samsung.com> 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 The stmfts (ST-Microelectronics FingerTip S) touchscreen device is a capacitive multi-touch controller mainly for mobile use. It's connected through i2c bus at the address 0x49 and it interfaces with userspace through input event interface. At the current state it provides a touchscreen multitouch functionality up to 10 fingers. Each finger is enumerated with a distinctive id (from 0 to 9). If enabled the device can support single "touch" hovering, by providing three coordinates, x, y and distance. It is possible to select the touchkey functionality which provides a basic two keys interface for "home" and "back" menu, typical in mobile phones. Signed-off-by: Andi Shyti --- drivers/input/touchscreen/Kconfig | 12 + drivers/input/touchscreen/Makefile | 1 + drivers/input/touchscreen/stmfts.c | 794 +++++++++++++++++++++++++++++++++++++ 3 files changed, 807 insertions(+) create mode 100644 drivers/input/touchscreen/stmfts.c diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig index 8650c94e29d0..18c2f919eb79 100644 --- a/drivers/input/touchscreen/Kconfig +++ b/drivers/input/touchscreen/Kconfig @@ -1092,6 +1092,18 @@ config TOUCHSCREEN_ST1232 To compile this driver as a module, choose M here: the module will be called st1232_ts. +config TOUCHSCREEN_STMFTS + tristate "STMicroelectronics STMFTS touchscreen" + depends on I2C + depends on INPUT + depends on LEDS_CLASS + help + Say Y here if you want support for STMicroelectronics + STMFTS touchscreen. + + To compile this driver as a module, choose M here: the + module will be called stmfts. + config TOUCHSCREEN_STMPE tristate "STMicroelectronics STMPE touchscreens" depends on MFD_STMPE diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile index e41e3c7aa427..be7673f9c71a 100644 --- a/drivers/input/touchscreen/Makefile +++ b/drivers/input/touchscreen/Makefile @@ -66,6 +66,7 @@ obj-$(CONFIG_TOUCHSCREEN_S3C2410) += s3c2410_ts.o obj-$(CONFIG_TOUCHSCREEN_SILEAD) += silead.o obj-$(CONFIG_TOUCHSCREEN_SIS_I2C) += sis_i2c.o obj-$(CONFIG_TOUCHSCREEN_ST1232) += st1232.o +obj-$(CONFIG_TOUCHSCREEN_STMFTS) += stmfts.o obj-$(CONFIG_TOUCHSCREEN_STMPE) += stmpe-ts.o obj-$(CONFIG_TOUCHSCREEN_SUN4I) += sun4i-ts.o obj-$(CONFIG_TOUCHSCREEN_SUR40) += sur40.o diff --git a/drivers/input/touchscreen/stmfts.c b/drivers/input/touchscreen/stmfts.c new file mode 100644 index 000000000000..e1415e290677 --- /dev/null +++ b/drivers/input/touchscreen/stmfts.c @@ -0,0 +1,794 @@ +/* + * Copyright (c) 2017 Samsung Electronics Co., Ltd. + * Author: Andi Shyti + * + * 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. + * + * STMicroelectronics FTS Touchscreen device driver + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* I2C commands */ +#define STMFTS_READ_INFO 0x80 +#define STMFTS_READ_STATUS 0x84 +#define STMFTS_READ_ONE_EVENT 0x85 +#define STMFTS_SLEEP_IN 0x91 +#define STMFTS_SLEEP_OUT 0x91 +#define STMFTS_MS_MT_SENSE_OFF 0x92 +#define STMFTS_MS_MT_SENSE_ON 0x93 +#define STMFTS_SS_HOVER_SENSE_OFF 0x94 +#define STMFTS_SS_HOVER_SENSE_ON 0x95 +#define STMFTS_MS_KEY_SENSE_OFF 0x9a +#define STMFTS_MS_KEY_SENSE_ON 0x9b +#define STMFTS_SYSTEM_RESET 0xa0 +#define STMFTS_CLEAR_EVENT_STACK 0xa1 +#define STMFTS_FULL_FORCE_CALIBRATION 0xa2 +#define STMFTS_MS_CX_TUNING 0xa3 +#define STMFTS_SS_CX_TUNING 0xa4 + +/* events */ +#define STMFTS_EV_NO_EVENT 0x00 +#define STMFTS_EV_MULTI_TOUCH_DETECTED 0x02 +#define STMFTS_EV_MULTI_TOUCH_ENTER 0x03 +#define STMFTS_EV_MULTI_TOUCH_LEAVE 0x04 +#define STMFTS_EV_MULTI_TOUCH_MOTION 0x05 +#define STMFTS_EV_HOVER_ENTER 0x07 +#define STMFTS_EV_HOVER_LEAVE 0x08 +#define STMFTS_EV_HOVER_MOTION 0x09 +#define STMFTS_EV_KEY_STATUS 0x0e +#define STMFTS_EV_ERROR 0x0f +#define STMFTS_EV_CONTROLLER_READY 0x10 +#define STMFTS_EV_SLEEP_OUT_CONTROLLER_READY 0x11 +#define STMFTS_EV_STATUS 0x16 + +/* multi touch related event masks */ +#define STMFTS_MASK_EVENT_ID 0x0f +#define STMFTS_MASK_TOUCH_ID 0xf0 +#define STMFTS_MASK_LEFT_EVENT 0x0f +#define STMFTS_MASK_X_MSB 0x0f +#define STMFTS_MASK_Y_LSB 0xf0 + +/* key related event masks */ +#define STMFTS_MASK_KEY_NO_TOUCH 0x00 +#define STMFTS_MASK_KEY_MENU 0x01 +#define STMFTS_MASK_KEY_BACK 0x02 + +#define STMFTS_EVENT_SIZE 8 +#define STMFTS_MAX_FINGERS 10 +#define STMFTS_DEV_NAME "stmfts" + +enum stmfts_regulators { + STMFTS_REGULATOR_VDD, + STMFTS_REGULATOR_AVDD, +}; + +struct stmfts_data { + struct i2c_client *client; + struct input_dev *input; + struct led_classdev led_cdev; + struct mutex mutex; + + struct touchscreen_properties prop; + + struct regulator_bulk_data regulators[2]; + + /* ledvdd will be used also to check + * whether the LED is supported + */ + struct regulator *ledvdd; + + bool use_key; + bool led_status; + + u16 chip_id; + u8 chip_ver; + u16 fw_ver; + u8 config_id; + u8 config_ver; + u8 in_touch; + + struct completion signal; + + bool hover_enabled; + bool running; +}; + +static void stmfts_brightness_set(struct led_classdev *led_cdev, + enum led_brightness value) +{ + struct stmfts_data *sdata = container_of(led_cdev, + struct stmfts_data, led_cdev); + + if (value == sdata->led_status) + return; + + if (!value) { + regulator_disable(sdata->ledvdd); + } else { + int err = regulator_enable(sdata->ledvdd); + + if (err) + dev_warn(&sdata->client->dev, + "failed to disable ledvdd regulator\n"); + } + + sdata->led_status = value; +} + +static enum led_brightness stmfts_brightness_get(struct led_classdev *led_cdev) +{ + struct stmfts_data *sdata = container_of(led_cdev, + struct stmfts_data, led_cdev); + + return !!regulator_is_enabled(sdata->ledvdd); +} + +static void stmfts_parse_event(struct stmfts_data *sdata, u8 event[]) +{ + int ret; + u8 id, t_id = 0; + u16 x, y, z, maj, min, orientation, area; + + id = event[0]; + + do { + mutex_lock(&sdata->mutex); + if (sdata->in_touch) { + id = event[0] & STMFTS_MASK_EVENT_ID; + t_id = (event[0] & STMFTS_MASK_TOUCH_ID) >> 4; + } else { + id = event[0]; + t_id = 0; + } + + switch (id) { + case STMFTS_EV_NO_EVENT: + break; + + case STMFTS_EV_MULTI_TOUCH_ENTER: + case STMFTS_EV_MULTI_TOUCH_LEAVE: + case STMFTS_EV_MULTI_TOUCH_MOTION: + if (id == STMFTS_EV_MULTI_TOUCH_ENTER) { + if (!(sdata->in_touch++)) + input_mt_report_slot_state( + sdata->input, + MT_TOOL_FINGER, true); + } else if (id == STMFTS_EV_MULTI_TOUCH_LEAVE) { + if (!(--sdata->in_touch)) + input_mt_report_slot_state( + sdata->input, + MT_TOOL_FINGER, false); + } + + x = event[1] | ((event[2] & STMFTS_MASK_X_MSB) << 8); + y = (event[2] >> 4) | (event[3] << 4); + + maj = event[4]; + min = event[5]; + orientation = event[6]; + area = event[7]; + + input_mt_slot(sdata->input, t_id); + input_report_abs(sdata->input, ABS_MT_POSITION_X, x); + input_report_abs(sdata->input, ABS_MT_POSITION_Y, y); + input_report_abs(sdata->input, ABS_MT_TOUCH_MAJOR, maj); + input_report_abs(sdata->input, ABS_MT_TOUCH_MINOR, min); + input_report_abs(sdata->input, ABS_MT_PRESSURE, area); + input_report_abs(sdata->input, ABS_MT_ORIENTATION, + orientation); + input_sync(sdata->input); + + break; + + case STMFTS_EV_HOVER_ENTER: + case STMFTS_EV_HOVER_LEAVE: + case STMFTS_EV_HOVER_MOTION: + x = (event[2] << 4) | (event[4] >> 4); + y = (event[3] << 4) | (event[4] & STMFTS_MASK_Y_LSB); + z = event[5]; + orientation = event[6] & STMFTS_MASK_Y_LSB; + + input_report_abs(sdata->input, ABS_X, x); + input_report_abs(sdata->input, ABS_Y, y); + input_report_abs(sdata->input, ABS_DISTANCE, z); + input_sync(sdata->input); + + break; + + case STMFTS_EV_KEY_STATUS: + switch (event[2]) { + case 0: + input_report_key(sdata->input, KEY_BACK, 0); + input_report_key(sdata->input, KEY_MENU, 0); + break; + + case STMFTS_MASK_KEY_BACK: + input_report_key(sdata->input, KEY_BACK, 1); + break; + + case STMFTS_MASK_KEY_MENU: + input_report_key(sdata->input, KEY_MENU, 1); + break; + + default: + dev_warn(&sdata->client->dev, + "unknown key event\n"); + } + + input_sync(sdata->input); + break; + + case STMFTS_EV_STATUS: + complete(&sdata->signal); + break; + + case STMFTS_EV_ERROR: + dev_err(&sdata->client->dev, + "error code: 0x%x%x%x%x%x%x", + event[6], event[5], event[4], + event[3], event[2], event[1]); + break; + + default: + dev_err(&sdata->client->dev, + "unknown event 0x%x\n", event[0]); + } + mutex_unlock(&sdata->mutex); + + ret = i2c_smbus_read_i2c_block_data(sdata->client, + STMFTS_READ_ONE_EVENT, + STMFTS_EVENT_SIZE, event); + if (ret) { + i2c_smbus_write_byte(sdata->client, + STMFTS_CLEAR_EVENT_STACK); + break; + } + + } while (event[0]); +} + +static irqreturn_t stmfts_irq_handler(int irq, void *dev) +{ + struct stmfts_data *sdata = dev; + int ret; + u8 event[STMFTS_EVENT_SIZE]; + + ret = i2c_smbus_read_i2c_block_data(sdata->client, + STMFTS_READ_ONE_EVENT, + STMFTS_EVENT_SIZE, event); + + switch (event[0]) { + case STMFTS_EV_CONTROLLER_READY: + case STMFTS_EV_SLEEP_OUT_CONTROLLER_READY: + complete(&sdata->signal); + break; + default: + stmfts_parse_event(sdata, event); + } + + return IRQ_HANDLED; +} + +static int stmfts_write_and_wait(struct stmfts_data *sdata, const u8 cmd) +{ + int err; + + err = i2c_smbus_write_byte(sdata->client, cmd); + if (err) + return err; + + err = wait_for_completion_timeout(&sdata->signal, + msecs_to_jiffies(1000)); + + return !err ? -ETIMEDOUT : 0; +} + +static int stmfts_input_open(struct input_dev *dev) +{ + int ret; + struct stmfts_data *sdata = input_get_drvdata(dev); + + ret = pm_runtime_get_sync(&sdata->client->dev); + if (ret < 0) + return ret; + + ret = i2c_smbus_write_byte(sdata->client, STMFTS_MS_MT_SENSE_ON); + if (ret) + return ret; + + mutex_lock(&sdata->mutex); + sdata->running = true; + + if (sdata->hover_enabled) { + ret = i2c_smbus_write_byte(sdata->client, + STMFTS_SS_HOVER_SENSE_ON); + if (ret) + dev_warn(&sdata->client->dev, + "failed to enable hover\n"); + } + mutex_unlock(&sdata->mutex); + + if (sdata->use_key) { + ret = i2c_smbus_write_byte(sdata->client, + STMFTS_MS_KEY_SENSE_ON); + if (ret) + /* I can still use only the touch screen */ + dev_warn(&sdata->client->dev, + "failed to enable touchkey\n"); + } + + return 0; +} + +static void stmfts_input_close(struct input_dev *dev) +{ + int ret; + struct stmfts_data *sdata = input_get_drvdata(dev); + + ret = i2c_smbus_write_byte(sdata->client, STMFTS_MS_MT_SENSE_OFF); + if (ret) + dev_warn(&sdata->client->dev, + "failed to disable touchscreen\n"); + + mutex_lock(&sdata->mutex); + sdata->running = false; + + if (sdata->hover_enabled) { + ret = i2c_smbus_write_byte(sdata->client, + STMFTS_SS_HOVER_SENSE_OFF); + if (ret) + dev_warn(&sdata->client->dev, + "failed to disable hover\n"); + } + mutex_unlock(&sdata->mutex); + + if (sdata->use_key) { + i2c_smbus_write_byte(sdata->client, STMFTS_MS_KEY_SENSE_OFF); + if (ret) + dev_warn(&sdata->client->dev, + "failed to disable touchkey\n"); + } + + pm_runtime_put_sync(&sdata->client->dev); +} + +static ssize_t stmfts_sysfs_chip_id(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct stmfts_data *sdata = dev_get_drvdata(dev); + + return sprintf(buf, "0x%x\n", sdata->chip_id); +} + +static ssize_t stmfts_sysfs_chip_version(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct stmfts_data *sdata = dev_get_drvdata(dev); + + return sprintf(buf, "%u\n", sdata->chip_ver); +} + +static ssize_t stmfts_sysfs_fw_ver(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct stmfts_data *sdata = dev_get_drvdata(dev); + + return sprintf(buf, "%u\n", sdata->fw_ver); +} + +static ssize_t stmfts_sysfs_config_id(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct stmfts_data *sdata = dev_get_drvdata(dev); + + return sprintf(buf, "0x%x\n", sdata->config_id); +} + +static ssize_t stmfts_sysfs_config_version(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct stmfts_data *sdata = dev_get_drvdata(dev); + + return sprintf(buf, "%u\n", sdata->config_ver); +} + +static ssize_t stmfts_sysfs_read_status(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct stmfts_data *sdata = dev_get_drvdata(dev); + u8 status[4]; + int ret; + + ret = i2c_smbus_read_i2c_block_data(sdata->client, + STMFTS_READ_STATUS, 4, status); + + return sprintf(buf, "0x%x\n", status[0]); +} + +static ssize_t stmfts_sysfs_hover_enable_read(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct stmfts_data *sdata = dev_get_drvdata(dev); + + return sprintf(buf, "%u\n", sdata->hover_enabled); +} + +static ssize_t stmfts_sysfs_hover_enable_write(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + unsigned long value; + int err; + struct stmfts_data *sdata = dev_get_drvdata(dev); + + if (kstrtoul(buf, 0, &value)) + return -EINVAL; + + mutex_lock(&sdata->mutex); + + if (value & sdata->hover_enabled) + goto out; + + if (!sdata->running) { + sdata->hover_enabled = !!value; + goto out; + } + + if (value) { + err = i2c_smbus_write_byte(sdata->client, + STMFTS_SS_HOVER_SENSE_ON); + sdata->hover_enabled = !err; + } else { + err = i2c_smbus_write_byte(sdata->client, + STMFTS_SS_HOVER_SENSE_OFF); + sdata->hover_enabled = !!err; + } + + if (err) + dev_warn(&sdata->client->dev, "failed to %s hover\n", + value ? "enable" : "disable"); +out: + mutex_unlock(&sdata->mutex); + + return len; +} + +static DEVICE_ATTR(chip_id, 0444, stmfts_sysfs_chip_id, NULL); +static DEVICE_ATTR(chip_version, 0444, stmfts_sysfs_chip_version, NULL); +static DEVICE_ATTR(fw_ver, 0444, stmfts_sysfs_fw_ver, NULL); +static DEVICE_ATTR(config_id, 0444, stmfts_sysfs_config_id, NULL); +static DEVICE_ATTR(config_version, 0444, stmfts_sysfs_config_version, NULL); +static DEVICE_ATTR(status, 0444, stmfts_sysfs_read_status, NULL); +static DEVICE_ATTR(hover_enable, 0644, stmfts_sysfs_hover_enable_read, + stmfts_sysfs_hover_enable_write); + +static struct attribute *stmfts_sysfs_attrs[] = { + &dev_attr_chip_id.attr, + &dev_attr_chip_version.attr, + &dev_attr_fw_ver.attr, + &dev_attr_config_id.attr, + &dev_attr_config_version.attr, + &dev_attr_status.attr, + &dev_attr_hover_enable.attr, + NULL +}; + +static struct attribute_group stmfts_attribute_group = { + .attrs = stmfts_sysfs_attrs +}; + +static int stmfts_power_on(struct stmfts_data *sdata) +{ + int err; + u8 reg[8]; + + err = regulator_bulk_enable(ARRAY_SIZE(sdata->regulators), + sdata->regulators); + if (err) + return err; + + /* + * the datasheet does not specify the power on time, but considering + * that the reset time is < 10ms, I sleep 20ms to be sure + */ + msleep(20); + + err = i2c_smbus_read_i2c_block_data(sdata->client, + STMFTS_READ_INFO, 8, reg); + if (err < 0) + return err; + if (err != 8) + return -EIO; + + sdata->chip_id = (reg[6] << 8) | reg[7]; + sdata->chip_ver = reg[0]; + sdata->fw_ver = (reg[2] << 8) | reg[3]; + sdata->config_id = reg[4]; + sdata->config_ver = reg[5]; + + reinit_completion(&sdata->signal); + + enable_irq(sdata->client->irq); + err = stmfts_write_and_wait(sdata, STMFTS_SYSTEM_RESET); + if (err) + return err; + + err = stmfts_write_and_wait(sdata, STMFTS_SLEEP_OUT); + if (err) + return err; + + /* optional tuning */ + err = stmfts_write_and_wait(sdata, STMFTS_MS_CX_TUNING); + if (err) + dev_warn(&sdata->client->dev, "failed to perform mutual auto tune\n"); + + /* optional tuning */ + err = stmfts_write_and_wait(sdata, STMFTS_SS_CX_TUNING); + if (err) + dev_warn(&sdata->client->dev, "failed to perform self auto tune\n"); + + err = stmfts_write_and_wait(sdata, STMFTS_FULL_FORCE_CALIBRATION); + if (err) + return err; + + /* at this point no one is using the touchscreen + * and I don't really care about the return value + */ + i2c_smbus_write_byte(sdata->client, STMFTS_SLEEP_IN); + + return 0; +} + +static void stmfts_power_off(void *data) +{ + struct stmfts_data *sdata = data; + + disable_irq(sdata->client->irq); + regulator_bulk_disable(ARRAY_SIZE(sdata->regulators), + sdata->regulators); +} + +/* This function is void because I don't want to prevent using the touch key + * only because the LEDs don't get registered + */ +static int stmfts_enable_led(struct stmfts_data *sdata) +{ + int err; + + /* get the regulator for powering the leds on */ + sdata->ledvdd = devm_regulator_get(&sdata->client->dev, "ledvdd"); + if (IS_ERR(sdata->ledvdd)) + return PTR_ERR(sdata->ledvdd); + + sdata->led_cdev.name = STMFTS_DEV_NAME; + sdata->led_cdev.max_brightness = LED_ON; + sdata->led_cdev.brightness = LED_OFF; + sdata->led_cdev.brightness_set = stmfts_brightness_set; + sdata->led_cdev.brightness_get = stmfts_brightness_get; + + err = devm_led_classdev_register(&sdata->client->dev, &sdata->led_cdev); + if (err) { + devm_regulator_put(sdata->ledvdd); + return err; + } + + return 0; +} + +static int stmfts_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + int err; + struct stmfts_data *sdata; + + if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C | + I2C_FUNC_SMBUS_BYTE_DATA | + I2C_FUNC_SMBUS_I2C_BLOCK)) + return -ENODEV; + + if (!client->dev.of_node) + return -ENOENT; + + sdata = devm_kzalloc(&client->dev, sizeof(*sdata), GFP_KERNEL); + if (!sdata) + return -ENOMEM; + + i2c_set_clientdata(client, sdata); + + mutex_init(&sdata->mutex); + + sdata->regulators[STMFTS_REGULATOR_VDD].supply = "vdd"; + sdata->regulators[STMFTS_REGULATOR_AVDD].supply = "avdd"; + err = devm_regulator_bulk_get(&client->dev, + ARRAY_SIZE(sdata->regulators), sdata->regulators); + if (err) + return err; + + err = devm_add_action_or_reset(&client->dev, stmfts_power_off, sdata); + if (err) + return err; + + sdata->client = client; + + init_completion(&sdata->signal); + + err = devm_request_threaded_irq(&client->dev, client->irq, + NULL, stmfts_irq_handler, + IRQF_ONESHOT | IRQF_TRIGGER_LOW, + "stmfts_irq", sdata); + if (err) + return err; + + /* + * Disable irq they, they are not needed at this stage. + * One possible case when an IRQ can be already rased is e.g. if the + * regulator is set as always on and the stmfts device sends an IRQ as + * soon as it gets powered, de-synchronizing the power on sequence. + * During power on, the device will be reset and all the initialization + * IRQ will be resent. + */ + disable_irq(sdata->client->irq); + + dev_info(&client->dev, "initializing ST-Microelectronics FTS...\n"); + err = stmfts_power_on(sdata); + if (err) + return err; + + sdata->use_key = of_property_read_bool(client->dev.of_node, + "touch-key-connected"); + + sdata->input = devm_input_allocate_device(&client->dev); + if (!sdata->input) + return -ENOMEM; + + sdata->input->name = STMFTS_DEV_NAME; + sdata->input->id.bustype = BUS_I2C; + sdata->input->open = stmfts_input_open; + sdata->input->close = stmfts_input_close; + + touchscreen_parse_properties(sdata->input, true, &sdata->prop); + + input_set_abs_params(sdata->input, ABS_MT_POSITION_X, 0, + sdata->prop.max_x, 0, 0); + input_set_abs_params(sdata->input, ABS_MT_POSITION_Y, 0, + sdata->prop.max_y, 0, 0); + input_set_abs_params(sdata->input, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0); + input_set_abs_params(sdata->input, ABS_MT_TOUCH_MINOR, 0, 255, 0, 0); + input_set_abs_params(sdata->input, ABS_MT_ORIENTATION, 0, 255, 0, 0); + input_set_abs_params(sdata->input, ABS_MT_PRESSURE, 0, 255, 0, 0); + input_set_abs_params(sdata->input, ABS_DISTANCE, 0, 255, 0, 0); + + if (sdata->use_key) { + input_set_capability(sdata->input, EV_KEY, KEY_MENU); + input_set_capability(sdata->input, EV_KEY, KEY_BACK); + } + + err = input_mt_init_slots(sdata->input, + STMFTS_MAX_FINGERS, INPUT_MT_DIRECT); + if (err) + return err; + + input_set_drvdata(sdata->input, sdata); + err = input_register_device(sdata->input); + if (err) + return err; + + if (sdata->use_key) { + err = stmfts_enable_led(sdata); + if (err) { + /* even if the LEDs have failed to be initialized and + * used in the driver, I can still use the device even + * without LEDs. The ledvdd regulator pointer will be + * used as a flag. + */ + dev_warn(&client->dev, + "unable to use touchkey leds\n"); + sdata->ledvdd = NULL; + } + } + + err = sysfs_create_group(&sdata->client->dev.kobj, + &stmfts_attribute_group); + if (err) + return err; + + pm_runtime_enable(&client->dev); + + return 0; +} + +static int stmfts_remove(struct i2c_client *client) +{ + struct stmfts_data *sdata = i2c_get_clientdata(client); + + pm_runtime_disable(&client->dev); + sysfs_remove_group(&sdata->client->dev.kobj, &stmfts_attribute_group); + + return 0; +} + +static int stmfts_runtime_suspend(struct device *dev) +{ + int ret; + struct stmfts_data *sdata = dev_get_drvdata(dev); + + ret = i2c_smbus_write_byte(sdata->client, STMFTS_SLEEP_IN); + if (ret) + dev_warn(&sdata->client->dev, "failed to suspend device\n"); + + return ret; +} + +static int stmfts_runtime_resume(struct device *dev) +{ + int ret; + struct stmfts_data *sdata = dev_get_drvdata(dev); + + ret = i2c_smbus_write_byte(sdata->client, STMFTS_SLEEP_OUT); + if (ret) + dev_err(&sdata->client->dev, "failed to resume device\n"); + + return ret; +} + +static int __maybe_unused stmfts_suspend(struct device *dev) +{ + struct stmfts_data *sdata = dev_get_drvdata(dev); + + stmfts_power_off(sdata); + + return 0; +} + +static int __maybe_unused stmfts_resume(struct device *dev) +{ + struct stmfts_data *sdata = dev_get_drvdata(dev); + + return stmfts_power_on(sdata); +} + +const struct dev_pm_ops stmfts_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(stmfts_suspend, stmfts_resume) + SET_RUNTIME_PM_OPS(stmfts_runtime_suspend, stmfts_runtime_resume, NULL) +}; + +static const struct of_device_id stmfts_of_match[] = { + { .compatible = "st,stmfts", }, + { }, +}; +MODULE_DEVICE_TABLE(of, stmfts_of_match); + +static const struct i2c_device_id stmfts_id[] = { + { "stmfts", 0 }, + { }, +}; +MODULE_DEVICE_TABLE(i2c, stmfts_id); + +static struct i2c_driver stmfts_driver = { + .driver = { + .name = STMFTS_DEV_NAME, + .of_match_table = of_match_ptr(stmfts_of_match), + .pm = &stmfts_pm_ops, + }, + .probe = stmfts_probe, + .remove = stmfts_remove, + .id_table = stmfts_id, +}; + +module_i2c_driver(stmfts_driver); + +MODULE_AUTHOR("Andi Shyti "); +MODULE_DESCRIPTION("STMicroelectronics FTS Touch Screen"); +MODULE_LICENSE("GPL v2");