--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Goodix "Berlin" Touchscreen IC driver
+ * Copyright (C) 2020 - 2021 Goodix, Inc.
+ * Copyright (C) 2023 Linaro Ltd.
+ *
+ * Based on goodix_ts_berlin driver.
+ *
+ * This driver is distinct from goodix.c since hardware interface
+ * is different enough to require a new driver.
+ * None of the register address or data structure are close enough
+ * to the previous generations.
+ *
+ * Currently the driver only handles Multitouch events with already
+ * programmed firmware and "config" for "Revision D" Berlin IC.
+ *
+ * Support is missing for:
+ * - ESD Management
+ * - Firmware update/flashing
+ * - "Config" update/flashing
+ * - Stylus Events
+ * - Gesture Events
+ * - Support for older revisions (A & B)
+ */
+
+#include <linux/bitfield.h>
+#include <linux/gpio/consumer.h>
+#include <linux/input.h>
+#include <linux/input/mt.h>
+#include <linux/input/touchscreen.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+#include <linux/sizes.h>
+#include <asm/unaligned.h>
+
+#include "goodix_berlin.h"
+
+#define GOODIX_BERLIN_MAX_TOUCH 10
+
+#define GOODIX_BERLIN_NORMAL_RESET_DELAY_MS 100
+
+#define GOODIX_BERLIN_TOUCH_EVENT BIT(7)
+#define GOODIX_BERLIN_REQUEST_EVENT BIT(6)
+#define GOODIX_BERLIN_TOUCH_COUNT_MASK GENMASK(3, 0)
+
+#define GOODIX_BERLIN_REQUEST_CODE_RESET 3
+
+#define GOODIX_BERLIN_POINT_TYPE_MASK GENMASK(3, 0)
+#define GOODIX_BERLIN_POINT_TYPE_STYLUS_HOVER 1
+#define GOODIX_BERLIN_POINT_TYPE_STYLUS 3
+
+#define GOODIX_BERLIN_TOUCH_ID_MASK GENMASK(7, 4)
+
+#define GOODIX_BERLIN_DEV_CONFIRM_VAL 0xAA
+#define GOODIX_BERLIN_BOOTOPTION_ADDR 0x10000
+#define GOODIX_BERLIN_FW_VERSION_INFO_ADDR 0x10014
+
+#define GOODIX_BERLIN_IC_INFO_MAX_LEN SZ_1K
+#define GOODIX_BERLIN_IC_INFO_ADDR 0x10070
+
+#define GOODIX_BERLIN_CHECKSUM_SIZE sizeof(u16)
+
+struct goodix_berlin_fw_version {
+ u8 rom_pid[6];
+ u8 rom_vid[3];
+ u8 rom_vid_reserved;
+ u8 patch_pid[8];
+ u8 patch_vid[4];
+ u8 patch_vid_reserved;
+ u8 sensor_id;
+ u8 reserved[2];
+ __le16 checksum;
+};
+
+struct goodix_berlin_ic_info_version {
+ u8 info_customer_id;
+ u8 info_version_id;
+ u8 ic_die_id;
+ u8 ic_version_id;
+ __le32 config_id;
+ u8 config_version;
+ u8 frame_data_customer_id;
+ u8 frame_data_version_id;
+ u8 touch_data_customer_id;
+ u8 touch_data_version_id;
+ u8 reserved[3];
+} __packed;
+
+struct goodix_berlin_ic_info_feature {
+ __le16 freqhop_feature;
+ __le16 calibration_feature;
+ __le16 gesture_feature;
+ __le16 side_touch_feature;
+ __le16 stylus_feature;
+} __packed;
+
+struct goodix_berlin_ic_info_misc {
+ __le32 cmd_addr;
+ __le16 cmd_max_len;
+ __le32 cmd_reply_addr;
+ __le16 cmd_reply_len;
+ __le32 fw_state_addr;
+ __le16 fw_state_len;
+ __le32 fw_buffer_addr;
+ __le16 fw_buffer_max_len;
+ __le32 frame_data_addr;
+ __le16 frame_data_head_len;
+ __le16 fw_attr_len;
+ __le16 fw_log_len;
+ u8 pack_max_num;
+ u8 pack_compress_version;
+ __le16 stylus_struct_len;
+ __le16 mutual_struct_len;
+ __le16 self_struct_len;
+ __le16 noise_struct_len;
+ __le32 touch_data_addr;
+ __le16 touch_data_head_len;
+ __le16 point_struct_len;
+ __le16 reserved1;
+ __le16 reserved2;
+ __le32 mutual_rawdata_addr;
+ __le32 mutual_diffdata_addr;
+ __le32 mutual_refdata_addr;
+ __le32 self_rawdata_addr;
+ __le32 self_diffdata_addr;
+ __le32 self_refdata_addr;
+ __le32 iq_rawdata_addr;
+ __le32 iq_refdata_addr;
+ __le32 im_rawdata_addr;
+ __le16 im_readata_len;
+ __le32 noise_rawdata_addr;
+ __le16 noise_rawdata_len;
+ __le32 stylus_rawdata_addr;
+ __le16 stylus_rawdata_len;
+ __le32 noise_data_addr;
+ __le32 esd_addr;
+} __packed;
+
+struct goodix_berlin_touch {
+ u8 status;
+ u8 reserved;
+ __le16 x;
+ __le16 y;
+ __le16 w;
+};
+#define GOODIX_BERLIN_TOUCH_SIZE sizeof(struct goodix_berlin_touch)
+
+struct goodix_berlin_header {
+ u8 status;
+ u8 reserved1;
+ u8 request_type;
+ u8 reserved2[3];
+ __le16 checksum;
+};
+#define GOODIX_BERLIN_HEADER_SIZE sizeof(struct goodix_berlin_header)
+
+struct goodix_berlin_event {
+ struct goodix_berlin_header hdr;
+ /* The data below is u16/__le16 aligned */
+ u8 data[GOODIX_BERLIN_TOUCH_SIZE * GOODIX_BERLIN_MAX_TOUCH +
+ GOODIX_BERLIN_CHECKSUM_SIZE];
+};
+
+struct goodix_berlin_core {
+ struct device *dev;
+ struct regmap *regmap;
+ struct regulator *avdd;
+ struct regulator *iovdd;
+ struct gpio_desc *reset_gpio;
+ struct touchscreen_properties props;
+ struct goodix_berlin_fw_version fw_version;
+ struct input_dev *input_dev;
+ int irq;
+
+ /* Runtime parameters extracted from IC_INFO buffer */
+ u32 touch_data_addr;
+
+ struct goodix_berlin_event event;
+};
+
+static bool goodix_berlin_checksum_valid(const u8 *data, int size)
+{
+ u32 cal_checksum = 0;
+ u16 r_checksum;
+ int i;
+
+ if (size < GOODIX_BERLIN_CHECKSUM_SIZE)
+ return false;
+
+ for (i = 0; i < size - GOODIX_BERLIN_CHECKSUM_SIZE; i++)
+ cal_checksum += data[i];
+
+ r_checksum = get_unaligned_le16(&data[i]);
+
+ return (u16)cal_checksum == r_checksum;
+}
+
+static bool goodix_berlin_is_dummy_data(struct goodix_berlin_core *cd,
+ const u8 *data, int size)
+{
+ int i;
+
+ /*
+ * If the device is missing or doesn't respond the buffer
+ * could be filled with bus default line state, 0x00 or 0xff,
+ * so declare success the first time we encounter neither.
+ */
+ for (i = 0; i < size; i++)
+ if (data[i] > 0 && data[i] < 0xff)
+ return false;
+
+ return true;
+}
+
+static int goodix_berlin_dev_confirm(struct goodix_berlin_core *cd)
+{
+ u8 tx_buf[8], rx_buf[8];
+ int retry = 3;
+ int error;
+
+ memset(tx_buf, GOODIX_BERLIN_DEV_CONFIRM_VAL, sizeof(tx_buf));
+ while (retry--) {
+ error = regmap_raw_write(cd->regmap,
+ GOODIX_BERLIN_BOOTOPTION_ADDR,
+ tx_buf, sizeof(tx_buf));
+ if (error)
+ return error;
+
+ error = regmap_raw_read(cd->regmap,
+ GOODIX_BERLIN_BOOTOPTION_ADDR,
+ rx_buf, sizeof(rx_buf));
+ if (error)
+ return error;
+
+ if (!memcmp(tx_buf, rx_buf, sizeof(tx_buf)))
+ return 0;
+
+ usleep_range(5000, 5100);
+ }
+
+ dev_err(cd->dev, "device confirm failed, rx_buf: %*ph\n",
+ (int)sizeof(rx_buf), rx_buf);
+
+ return -EINVAL;
+}
+
+static int goodix_berlin_power_on(struct goodix_berlin_core *cd)
+{
+ int error;
+
+ error = regulator_enable(cd->iovdd);
+ if (error) {
+ dev_err(cd->dev, "Failed to enable iovdd: %d\n", error);
+ return error;
+ }
+
+ /* Vendor waits 3ms for IOVDD to settle */
+ usleep_range(3000, 3100);
+
+ error = regulator_enable(cd->avdd);
+ if (error) {
+ dev_err(cd->dev, "Failed to enable avdd: %d\n", error);
+ goto err_iovdd_disable;
+ }
+
+ /* Vendor waits 15ms for IOVDD to settle */
+ usleep_range(15000, 15100);
+
+ gpiod_set_value_cansleep(cd->reset_gpio, 0);
+
+ /* Vendor waits 4ms for Firmware to initialize */
+ usleep_range(4000, 4100);
+
+ error = goodix_berlin_dev_confirm(cd);
+ if (error)
+ goto err_dev_reset;
+
+ /* Vendor waits 100ms for Firmware to fully boot */
+ msleep(GOODIX_BERLIN_NORMAL_RESET_DELAY_MS);
+
+ return 0;
+
+err_dev_reset:
+ gpiod_set_value_cansleep(cd->reset_gpio, 1);
+ regulator_disable(cd->avdd);
+err_iovdd_disable:
+ regulator_disable(cd->iovdd);
+ return error;
+}
+
+static void goodix_berlin_power_off(struct goodix_berlin_core *cd)
+{
+ gpiod_set_value_cansleep(cd->reset_gpio, 1);
+ regulator_disable(cd->avdd);
+ regulator_disable(cd->iovdd);
+}
+
+static int goodix_berlin_read_version(struct goodix_berlin_core *cd)
+{
+ int error;
+
+ error = regmap_raw_read(cd->regmap, GOODIX_BERLIN_FW_VERSION_INFO_ADDR,
+ &cd->fw_version, sizeof(cd->fw_version));
+ if (error) {
+ dev_err(cd->dev, "error reading fw version, %d\n", error);
+ return error;
+ }
+
+ if (!goodix_berlin_checksum_valid((u8 *)&cd->fw_version,
+ sizeof(cd->fw_version))) {
+ dev_err(cd->dev, "invalid fw version: checksum error\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+/* Only extract necessary data for runtime */
+static int goodix_berlin_parse_ic_info(struct goodix_berlin_core *cd,
+ const u8 *data, u16 length)
+{
+ struct goodix_berlin_ic_info_misc *misc;
+ unsigned int offset = 0;
+
+ offset += sizeof(__le16); /* length */
+ offset += sizeof(struct goodix_berlin_ic_info_version);
+ offset += sizeof(struct goodix_berlin_ic_info_feature);
+
+ /* IC_INFO Parameters, variable width structure */
+ offset += 4 * sizeof(u8); /* drv_num, sen_num, button_num, force_num */
+ if (offset >= length)
+ goto invalid_offset;
+
+#define ADVANCE_LE16_PARAMS() \
+ do { \
+ u8 param_num = data[offset++]; \
+ offset += param_num * sizeof(__le16); \
+ if (offset >= length) \
+ goto invalid_offset; \
+ } while (0)
+ ADVANCE_LE16_PARAMS(); /* active_scan_rate_num */
+ ADVANCE_LE16_PARAMS(); /* mutual_freq_num*/
+ ADVANCE_LE16_PARAMS(); /* self_tx_freq_num */
+ ADVANCE_LE16_PARAMS(); /* self_rx_freq_num */
+ ADVANCE_LE16_PARAMS(); /* stylus_freq_num */
+#undef ADVANCE_LE16_PARAMS
+
+ misc = (struct goodix_berlin_ic_info_misc *)&data[offset];
+ cd->touch_data_addr = le32_to_cpu(misc->touch_data_addr);
+
+ return 0;
+
+invalid_offset:
+ dev_err(cd->dev, "ic_info length is invalid (offset %d length %d)\n",
+ offset, length);
+ return -EINVAL;
+}
+
+static int goodix_berlin_get_ic_info(struct goodix_berlin_core *cd)
+{
+ u8 *afe_data __free(kfree) = NULL;
+ __le16 length_raw;
+ u16 length;
+ int error;
+
+ afe_data = kzalloc(GOODIX_BERLIN_IC_INFO_MAX_LEN, GFP_KERNEL);
+ if (!afe_data)
+ return -ENOMEM;
+
+ error = regmap_raw_read(cd->regmap, GOODIX_BERLIN_IC_INFO_ADDR,
+ &length_raw, sizeof(length_raw));
+ if (error) {
+ dev_err(cd->dev, "failed get ic info length, %d\n", error);
+ return error;
+ }
+
+ length = le16_to_cpu(length_raw);
+ if (length >= GOODIX_BERLIN_IC_INFO_MAX_LEN) {
+ dev_err(cd->dev, "invalid ic info length %d\n", length);
+ return -EINVAL;
+ }
+
+ error = regmap_raw_read(cd->regmap, GOODIX_BERLIN_IC_INFO_ADDR,
+ afe_data, length);
+ if (error) {
+ dev_err(cd->dev, "failed get ic info data, %d\n", error);
+ return error;
+ }
+
+ /* check whether the data is valid (ex. bus default values) */
+ if (goodix_berlin_is_dummy_data(cd, afe_data, length)) {
+ dev_err(cd->dev, "fw info data invalid\n");
+ return -EINVAL;
+ }
+
+ if (!goodix_berlin_checksum_valid(afe_data, length)) {
+ dev_err(cd->dev, "fw info checksum error\n");
+ return -EINVAL;
+ }
+
+ error = goodix_berlin_parse_ic_info(cd, afe_data, length);
+ if (error)
+ return error;
+
+ /* check some key info */
+ if (!cd->touch_data_addr) {
+ dev_err(cd->dev, "touch_data_addr is null\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int goodix_berlin_get_remaining_contacts(struct goodix_berlin_core *cd,
+ int n)
+{
+ size_t offset = 2 * GOODIX_BERLIN_TOUCH_SIZE +
+ GOODIX_BERLIN_CHECKSUM_SIZE;
+ u32 addr = cd->touch_data_addr + GOODIX_BERLIN_HEADER_SIZE + offset;
+ int error;
+
+ error = regmap_raw_read(cd->regmap, addr,
+ &cd->event.data[offset],
+ (n - 2) * GOODIX_BERLIN_TOUCH_SIZE);
+ if (error) {
+ dev_err_ratelimited(cd->dev, "failed to get touch data, %d\n",
+ error);
+ return error;
+ }
+
+ return 0;
+}
+
+static void goodix_berlin_report_state(struct goodix_berlin_core *cd, int n)
+{
+ struct goodix_berlin_touch *touch_data =
+ (struct goodix_berlin_touch *)cd->event.data;
+ struct goodix_berlin_touch *t;
+ int i;
+ u8 type, id;
+
+ for (i = 0; i < n; i++) {
+ t = &touch_data[i];
+
+ type = FIELD_GET(GOODIX_BERLIN_POINT_TYPE_MASK, t->status);
+ if (type == GOODIX_BERLIN_POINT_TYPE_STYLUS ||
+ type == GOODIX_BERLIN_POINT_TYPE_STYLUS_HOVER) {
+ dev_warn_once(cd->dev, "Stylus event type not handled\n");
+ continue;
+ }
+
+ id = FIELD_GET(GOODIX_BERLIN_TOUCH_ID_MASK, t->status);
+ if (id >= GOODIX_BERLIN_MAX_TOUCH) {
+ dev_warn_ratelimited(cd->dev, "invalid finger id %d\n", id);
+ continue;
+ }
+
+ input_mt_slot(cd->input_dev, id);
+ input_mt_report_slot_state(cd->input_dev, MT_TOOL_FINGER, true);
+
+ touchscreen_report_pos(cd->input_dev, &cd->props,
+ __le16_to_cpu(t->x), __le16_to_cpu(t->y),
+ true);
+ input_report_abs(cd->input_dev, ABS_MT_TOUCH_MAJOR,
+ __le16_to_cpu(t->w));
+ }
+
+ input_mt_sync_frame(cd->input_dev);
+ input_sync(cd->input_dev);
+}
+
+static void goodix_berlin_touch_handler(struct goodix_berlin_core *cd)
+{
+ u8 touch_num;
+ int error;
+
+ touch_num = FIELD_GET(GOODIX_BERLIN_TOUCH_COUNT_MASK,
+ cd->event.hdr.request_type);
+ if (touch_num > GOODIX_BERLIN_MAX_TOUCH) {
+ dev_warn(cd->dev, "invalid touch num %d\n", touch_num);
+ return;
+ }
+
+ if (touch_num > 2) {
+ /* read additional contact data if more than 2 touch events */
+ error = goodix_berlin_get_remaining_contacts(cd, touch_num);
+ if (error)
+ return;
+ }
+
+ if (touch_num) {
+ int len = touch_num * GOODIX_BERLIN_TOUCH_SIZE +
+ GOODIX_BERLIN_CHECKSUM_SIZE;
+ if (!goodix_berlin_checksum_valid(cd->event.data, len)) {
+ dev_err(cd->dev, "touch data checksum error: %*ph\n",
+ len, cd->event.data);
+ return;
+ }
+ }
+
+ goodix_berlin_report_state(cd, touch_num);
+}
+
+static int goodix_berlin_request_handle_reset(struct goodix_berlin_core *cd)
+{
+ gpiod_set_value_cansleep(cd->reset_gpio, 1);
+ usleep_range(2000, 2100);
+ gpiod_set_value_cansleep(cd->reset_gpio, 0);
+
+ msleep(GOODIX_BERLIN_NORMAL_RESET_DELAY_MS);
+
+ return 0;
+}
+
+static irqreturn_t goodix_berlin_irq(int irq, void *data)
+{
+ struct goodix_berlin_core *cd = data;
+ int error;
+
+ /*
+ * First, read buffer with space for 2 touch events:
+ * - GOODIX_BERLIN_HEADER_SIZE = 8 bytes
+ * - GOODIX_BERLIN_TOUCH_SIZE * 2 = 16 bytes
+ * - GOODIX_BERLIN_CHECKLSUM_SIZE = 2 bytes
+ * For a total of 26 bytes.
+ *
+ * If only a single finger is reported, we will read 8 bytes more than
+ * needed:
+ * - bytes 0-7: Header (GOODIX_BERLIN_HEADER_SIZE)
+ * - bytes 8-15: Finger 0 Data
+ * - bytes 24-25: Checksum
+ * - bytes 18-25: Unused 8 bytes
+ *
+ * If 2 fingers are reported, we would have read the exact needed
+ * amount of data and checksum would be at the end of the buffer:
+ * - bytes 0-7: Header (GOODIX_BERLIN_HEADER_SIZE)
+ * - bytes 8-15: Finger 0 Bytes 0-7
+ * - bytes 16-23: Finger 1 Bytes 0-7
+ * - bytes 24-25: Checksum
+ *
+ * If more than 2 fingers were reported, the "Checksum" bytes would
+ * in fact contain part of the next finger data, and then
+ * goodix_berlin_get_remaining_contacts() would complete the buffer
+ * with the missing bytes, including the trailing checksum.
+ * For example, if 3 fingers are reported, then we would do:
+ * Read 1:
+ * - bytes 0-7: Header (GOODIX_BERLIN_HEADER_SIZE)
+ * - bytes 8-15: Finger 0 Bytes 0-7
+ * - bytes 16-23: Finger 1 Bytes 0-7
+ * - bytes 24-25: Finger 2 Bytes 0-1
+ * Read 2 (with length of (3 - 2) * 8 = 8 bytes):
+ * - bytes 26-31: Finger 2 Bytes 2-7
+ * - bytes 32-33: Checksum
+ */
+ error = regmap_raw_read(cd->regmap, cd->touch_data_addr,
+ &cd->event,
+ GOODIX_BERLIN_HEADER_SIZE +
+ 2 * GOODIX_BERLIN_TOUCH_SIZE +
+ GOODIX_BERLIN_CHECKSUM_SIZE);
+ if (error) {
+ dev_warn_ratelimited(cd->dev,
+ "failed get event head data: %d\n", error);
+ goto out;
+ }
+
+ if (cd->event.hdr.status == 0)
+ goto out;
+
+ if (!goodix_berlin_checksum_valid((u8 *)&cd->event.hdr,
+ GOODIX_BERLIN_HEADER_SIZE)) {
+ dev_warn_ratelimited(cd->dev,
+ "touch head checksum error: %*ph\n",
+ (int)GOODIX_BERLIN_HEADER_SIZE,
+ &cd->event.hdr);
+ goto out_clear;
+ }
+
+ if (cd->event.hdr.status & GOODIX_BERLIN_TOUCH_EVENT)
+ goodix_berlin_touch_handler(cd);
+
+ if (cd->event.hdr.status & GOODIX_BERLIN_REQUEST_EVENT) {
+ switch (cd->event.hdr.request_type) {
+ case GOODIX_BERLIN_REQUEST_CODE_RESET:
+ if (cd->reset_gpio)
+ goodix_berlin_request_handle_reset(cd);
+ break;
+
+ default:
+ dev_warn(cd->dev, "unsupported request code 0x%x\n",
+ cd->event.hdr.request_type);
+ }
+ }
+
+
+out_clear:
+ /* Clear up status field */
+ regmap_write(cd->regmap, cd->touch_data_addr, 0);
+
+out:
+ return IRQ_HANDLED;
+}
+
+static int goodix_berlin_input_dev_config(struct goodix_berlin_core *cd,
+ const struct input_id *id)
+{
+ struct input_dev *input_dev;
+ int error;
+
+ input_dev = devm_input_allocate_device(cd->dev);
+ if (!input_dev)
+ return -ENOMEM;
+
+ cd->input_dev = input_dev;
+ input_set_drvdata(input_dev, cd);
+
+ input_dev->name = "Goodix Berlin Capacitive TouchScreen";
+ input_dev->phys = "input/ts";
+
+ input_dev->id = *id;
+
+ input_set_abs_params(cd->input_dev, ABS_MT_POSITION_X,
+ 0, SZ_64K - 1, 0, 0);
+ input_set_abs_params(cd->input_dev, ABS_MT_POSITION_Y,
+ 0, SZ_64K - 1, 0, 0);
+ input_set_abs_params(cd->input_dev, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
+
+ touchscreen_parse_properties(cd->input_dev, true, &cd->props);
+
+ error = input_mt_init_slots(cd->input_dev, GOODIX_BERLIN_MAX_TOUCH,
+ INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
+ if (error)
+ return error;
+
+ error = input_register_device(cd->input_dev);
+ if (error)
+ return error;
+
+ return 0;
+}
+
+static int goodix_berlin_suspend(struct device *dev)
+{
+ struct goodix_berlin_core *cd = dev_get_drvdata(dev);
+
+ disable_irq(cd->irq);
+ goodix_berlin_power_off(cd);
+
+ return 0;
+}
+
+static int goodix_berlin_resume(struct device *dev)
+{
+ struct goodix_berlin_core *cd = dev_get_drvdata(dev);
+ int error;
+
+ error = goodix_berlin_power_on(cd);
+ if (error)
+ return error;
+
+ enable_irq(cd->irq);
+
+ return 0;
+}
+
+EXPORT_GPL_SIMPLE_DEV_PM_OPS(goodix_berlin_pm_ops,
+ goodix_berlin_suspend, goodix_berlin_resume);
+
+static void goodix_berlin_power_off_act(void *data)
+{
+ struct goodix_berlin_core *cd = data;
+
+ goodix_berlin_power_off(cd);
+}
+
+int goodix_berlin_probe(struct device *dev, int irq, const struct input_id *id,
+ struct regmap *regmap)
+{
+ struct goodix_berlin_core *cd;
+ int error;
+
+ if (irq <= 0) {
+ dev_err(dev, "Missing interrupt number\n");
+ return -EINVAL;
+ }
+
+ cd = devm_kzalloc(dev, sizeof(*cd), GFP_KERNEL);
+ if (!cd)
+ return -ENOMEM;
+
+ cd->dev = dev;
+ cd->regmap = regmap;
+ cd->irq = irq;
+
+ cd->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
+ if (IS_ERR(cd->reset_gpio))
+ return dev_err_probe(dev, PTR_ERR(cd->reset_gpio),
+ "Failed to request reset gpio\n");
+
+ cd->avdd = devm_regulator_get(dev, "avdd");
+ if (IS_ERR(cd->avdd))
+ return dev_err_probe(dev, PTR_ERR(cd->avdd),
+ "Failed to request avdd regulator\n");
+
+ cd->iovdd = devm_regulator_get(dev, "iovdd");
+ if (IS_ERR(cd->iovdd))
+ return dev_err_probe(dev, PTR_ERR(cd->iovdd),
+ "Failed to request iovdd regulator\n");
+
+ error = goodix_berlin_power_on(cd);
+ if (error) {
+ dev_err(dev, "failed power on");
+ return error;
+ }
+
+ error = devm_add_action_or_reset(dev, goodix_berlin_power_off_act, cd);
+ if (error)
+ return error;
+
+ error = goodix_berlin_read_version(cd);
+ if (error) {
+ dev_err(dev, "failed to get version info");
+ return error;
+ }
+
+ error = goodix_berlin_get_ic_info(cd);
+ if (error) {
+ dev_err(dev, "invalid ic info, abort");
+ return error;
+ }
+
+ error = goodix_berlin_input_dev_config(cd, id);
+ if (error) {
+ dev_err(dev, "failed set input device");
+ return error;
+ }
+
+ error = devm_request_threaded_irq(dev, cd->irq, NULL, goodix_berlin_irq,
+ IRQF_ONESHOT, "goodix-berlin", cd);
+ if (error) {
+ dev_err(dev, "request threaded irq failed: %d\n", error);
+ return error;
+ }
+
+ dev_set_drvdata(dev, cd);
+
+ dev_dbg(dev, "Goodix Berlin %s Touchscreen Controller",
+ cd->fw_version.patch_pid);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(goodix_berlin_probe);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Goodix Berlin Core Touchscreen driver");
+MODULE_AUTHOR("Neil Armstrong <neil.armstrong@linaro.org>");
projects / linux.git / commitdiff