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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Caleb Connolly <caleb@postmarketos.org>
Date: Sun, 30 Jun 2024 20:36:30 +0200
Subject: Input: touchscreen: add Synaptics TCM oncell S3908
The TCM oncell is the next generation of Synaptics touchscreen ICs.
These run a very featured firmware with a reasonably well defined API.
It is however entirely incompatible with the existing RMI4 interface.
Unfortunately, no public datasheet for the interface seems to be
available, instead this driver was created through a combination of
vendor drivers and trial and error.
The firmware interface implies support for defining the exact bit
encoding of the touch reports, however on the S3908 chip + firmware
found in the OnePlus 8t the TCM_SET_TOUCH_REPORT_CONFIG command appears
to be unsupported.
Co-developed-by: Frieder Hannenheim <frieder.hannenheim@proton.me>
Signed-off-by: Frieder Hannenheim <frieder.hannenheim@proton.me>
Signed-off-by: Caleb Connolly <caleb@postmarketos.org>
---
MAINTAINERS | 7 +
drivers/input/touchscreen/Kconfig | 11 +
drivers/input/touchscreen/Makefile | 1 +
drivers/input/touchscreen/synaptics_tcm_oncell.c | 570 ++++++++++
4 files changed, 589 insertions(+)
diff --git a/MAINTAINERS b/MAINTAINERS
index 111111111111..222222222222 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -22333,6 +22333,13 @@ S: Maintained
F: Documentation/devicetree/bindings/regulator/silergy,sy8106a.yaml
F: drivers/regulator/sy8106a-regulator.c
+SYNAPTICS TCM ONCELL TOUCHSCREEN DRIVER
+M: Caleb Connolly <caleb@postmarketos.org>
+L: linux-input@vger.kernel.org
+S: Maintained
+F: Documentation/devicetree/bindings/input/touchscreen/syna,tcm-oncell.yaml
+F: drivers/input/touchscreen/synaptics_tcm_oncell.c
+
SYNC FILE FRAMEWORK
M: Sumit Semwal <sumit.semwal@linaro.org>
R: Gustavo Padovan <gustavo@padovan.org>
diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 111111111111..222222222222 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -504,6 +504,17 @@ config TOUCHSCREEN_S6SY761
To compile this driver as module, choose M here: the
module will be called s6sy761.
+config TOUCHSCREEN_SYNAPTICS_TCM_ONCELL
+ tristate "Synaptics TCM Oncell Touchscreen driver"
+ depends on I2C
+ help
+ Say Y if you have the Synaptics S3908 TCM Oncell
+
+ If unsure, say N
+
+ To compile this driver as module, choose M here: the
+ module will be called synaptics_tcm_oncell.
+
config TOUCHSCREEN_GUNZE
tristate "Gunze AHL-51S touchscreen"
select SERIO
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 111111111111..222222222222 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -85,6 +85,7 @@ obj-$(CONFIG_TOUCHSCREEN_STMPE) += stmpe-ts.o
obj-$(CONFIG_TOUCHSCREEN_SUN4I) += sun4i-ts.o
obj-$(CONFIG_TOUCHSCREEN_SUR40) += sur40.o
obj-$(CONFIG_TOUCHSCREEN_SURFACE3_SPI) += surface3_spi.o
+obj-$(CONFIG_TOUCHSCREEN_SYNAPTICS_TCM_ONCELL) += synaptics_tcm_oncell.o
obj-$(CONFIG_TOUCHSCREEN_TI_AM335X_TSC) += ti_am335x_tsc.o
obj-$(CONFIG_TOUCHSCREEN_TOUCHIT213) += touchit213.o
obj-$(CONFIG_TOUCHSCREEN_TOUCHRIGHT) += touchright.o
diff --git a/drivers/input/touchscreen/synaptics_tcm_oncell.c b/drivers/input/touchscreen/synaptics_tcm_oncell.c
new file mode 100644
index 000000000000..111111111111
--- /dev/null
+++ b/drivers/input/touchscreen/synaptics_tcm_oncell.c
@@ -0,0 +1,570 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Driver for Synaptics TCM Oncell Touchscreens
+ *
+ * Copyright (c) 2024 Frieder Hannenheim <frieder.hannenheim@proton.me>
+ * Copyright (c) 2024 Caleb Connolly <caleb@postmarketos.org>
+ */
+
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/input/touchscreen.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/property.h>
+#include <linux/unaligned.h>
+#include <linux/delay.h>
+#include <linux/input/mt.h>
+#include <linux/input/touchscreen.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/of_gpio.h>
+#include <linux/module.h>
+#include <linux/pm_runtime.h>
+#include <linux/regulator/consumer.h>
+
+/*
+ * The TCM oncell interface uses a command byte, which may be followed by additional
+ * data. The packet format is defined in the tcm_cmd struct.
+ *
+ * The following list only defines commands that are used in this driver (and their
+ * counterparts for context). Vendor reference implementations can be found at
+ * https://github.com/LineageOS/android_kernel_oneplus_sm8250/tree/ee0a7ee1939ffd53000e42051caf8f0800defb27/drivers/input/touchscreen/synaptics_tcm
+ */
+
+/*
+ * Request information about the chip. We don't send this command explicitly as
+ * the controller automatically sends this information when starting up.
+ */
+#define TCM_IDENTIFY 0x02
+
+/* Enable/disable reporting touch inputs */
+#define TCM_ENABLE_REPORT 0x05
+#define TCM_DISABLE_REPORT 0x06
+
+/*
+ * After powering on, we send this to exit the bootloader mode and run the main
+ * firmware.
+ */
+#define TCM_RUN_APPLICATION_FIRMWARE 0x14
+
+/*
+ * Reports information about the vendor provided application firmware. This is
+ * also used to determine when the firmware has finished booting.
+ */
+#define TCM_GET_APPLICATION_INFO 0x20
+
+#define MODE_APPLICATION 0x01
+
+#define APP_STATUS_OK 0x00
+#define APP_STATUS_BOOTING 0x01
+#define APP_STATUS_UPDATING 0x02
+
+/* status codes */
+#define REPORT_IDLE 0x00
+#define REPORT_OK 0x01
+#define REPORT_BUSY 0x02
+#define REPORT_CONTINUED_READ 0x03
+#define REPORT_RECEIVE_BUFFER_OVERFLOW 0x0c
+#define REPORT_PREVIOUS_COMMAND_PENDING 0x0d
+#define REPORT_NOT_IMPLEMENTED 0x0e
+#define REPORT_ERROR 0x0f
+
+/* report types */
+#define REPORT_IDENTIFY 0x10
+#define REPORT_TOUCH 0x11
+#define REPORT_DELTA 0x12
+#define REPORT_RAW 0x13
+#define REPORT_DEBUG 0x14
+#define REPORT_LOG 0x1d
+#define REPORT_TOUCH_HOLD 0x20
+#define REPORT_INVALID 0xff
+
+struct tcm_message_header {
+ u8 marker;
+ u8 code;
+ __le16 length;
+} __packed;
+
+struct tcm_cmd {
+ u8 cmd;
+ __le16 length;
+ u8 data[];
+};
+
+struct tcm_identification {
+ struct tcm_message_header header;
+ u8 version;
+ u8 mode;
+ char part_number[16];
+ u8 build_id[4];
+ u8 max_write_size[2];
+} __packed;
+
+struct tcm_app_info {
+ struct tcm_message_header header;
+ u8 version[2];
+ __le16 status;
+ u8 static_config_size[2];
+ u8 dynamic_config_size[2];
+ u8 app_config_start_write_block[2];
+ u8 app_config_size[2];
+ u8 max_touch_report_config_size[2];
+ u8 max_touch_report_payload_size[2];
+ char customer_config_id[16];
+ __le16 max_x;
+ __le16 max_y;
+ u8 max_objects[2];
+ u8 num_of_buttons[2];
+ u8 num_of_image_rows[2];
+ u8 num_of_image_cols[2];
+ u8 has_hybrid_data[2];
+} __packed;
+
+struct tcm_data {
+ struct i2c_client *client;
+ struct regmap *regmap;
+ struct input_dev *input;
+ struct gpio_desc *reset_gpio;
+ struct completion response;
+ struct touchscreen_properties props;
+ struct regulator_bulk_data supplies[2];
+
+ /* annoying state */
+ u16 buf_size;
+ char buf[256];
+};
+
+static int tcm_send_cmd(struct tcm_data *tcm, struct tcm_cmd *cmd)
+{
+ struct i2c_client *client = tcm->client;
+ struct i2c_msg msg;
+ int ret;
+
+ dev_dbg(&client->dev, "sending command %#x\n", cmd->cmd);
+
+ msg.addr = client->addr;
+ msg.flags = 0;
+ msg.len = 1 + cmd->length;
+ msg.buf = (u8 *)cmd;
+
+ ret = i2c_transfer(client->adapter, &msg, 1);
+ if (ret == 1)
+ return 0;
+ else if (ret < 0)
+ return ret;
+ else
+ return -EIO;
+}
+
+static int tcm_send_cmd_noargs(struct tcm_data *tcm, u8 cmd)
+{
+ struct tcm_cmd c = {
+ .cmd = cmd,
+ .length = 0,
+ };
+
+ return tcm_send_cmd(tcm, &c);
+}
+
+static int tcm_recv_report(struct tcm_data *tcm,
+ void *buf, size_t length)
+{
+ struct i2c_client *client = tcm->client;
+ struct i2c_msg msg;
+ int ret;
+
+ msg.addr = client->addr;
+ msg.flags = I2C_M_RD;
+ msg.len = length;
+ msg.buf = buf;
+
+ ret = i2c_transfer(client->adapter, &msg, 1);
+ if (ret == 1)
+ return 0;
+ else if (ret < 0)
+ return ret;
+ else
+ return -EIO;
+}
+
+static int tcm_read_message(struct tcm_data *tcm, u8 cmd, void *buf, size_t length)
+{
+ int ret;
+
+ reinit_completion(&tcm->response);
+ ret = tcm_send_cmd_noargs(tcm, cmd);
+ if (ret)
+ return ret;
+
+ ret = wait_for_completion_timeout(&tcm->response, msecs_to_jiffies(1000));
+ if (ret == 0)
+ return -ETIMEDOUT;
+
+ if (buf) {
+ if (length > tcm->buf_size) {
+ dev_warn(&tcm->client->dev, "expected %zu bytes, got %u\n",
+ length, tcm->buf_size);
+ }
+ length = min(tcm->buf_size, length);
+ memcpy(buf, tcm->buf, length);
+ }
+
+ return 0;
+}
+
+static void tcm_power_off(void *data)
+{
+ struct tcm_data *tcm = data;
+
+ disable_irq(tcm->client->irq);
+ regulator_bulk_disable(ARRAY_SIZE(tcm->supplies), tcm->supplies);
+}
+
+static int tcm_input_open(struct input_dev *dev)
+{
+ struct tcm_data *tcm = input_get_drvdata(dev);
+
+ return i2c_smbus_write_byte(tcm->client, TCM_ENABLE_REPORT);
+}
+
+static void tcm_input_close(struct input_dev *dev)
+{
+ struct tcm_data *tcm = input_get_drvdata(dev);
+ int ret;
+
+ ret = i2c_smbus_write_byte(tcm->client, TCM_DISABLE_REPORT);
+ if (ret)
+ dev_err(&tcm->client->dev, "failed to turn off sensing\n");
+}
+
+/*
+ * The default report config looks like this:
+ *
+ * a5 01 80 00 11 08 1e 08 0f 01 04 01 06 04 07 04
+ * 08 0c 09 0c 0a 08 0b 08 0c 08 0d 10 0e 10 03 00
+ * 00 00
+ *
+ * a5 01 80 00 - HEADER + length
+ *
+ * 11 08 - TOUCH_FRAME_RATE (8 bits)
+ * 30 08 - UNKNOWN (8 bits)
+ * 0f 01 - TOUCH_0D_BUTTONS_STATE (1 bit)
+ * 04 01 - TOUCH_PAD_TO_NEXT_BYTE (7 bits - padding)
+ * 06 04 - TOUCH_OBJECT_N_INDEX (4 bits)
+ * 07 04 - TOUCH_OBJECT_N_CLASSIFICATION (4 bits)
+ * 08 0c - TOUCH_OBJECT_N_X_POSITION (12 bits)
+ * 09 0c - TOUCH_OBJECT_N_Y_POSITION (12 bits)
+ * 0a 08 - TOUCH_OBJECT_N_Z (8 bits)
+ * 0b 08 - TOUCH_OBJECT_N_X_WIDTH (8 bits)
+ * 0c 08 - TOUCH_OBJECT_N_Y_WIDTH (8 bits)
+ * 0d 10 - TOUCH_OBJECT_N_TX_POSITION_TIXELS (16 bits) ??
+ * 0e 10 - TOUCH_OBJECT_N_RX_POSITION_TIXELS (16 bits) ??
+ * 03 00 - TOUCH_FOREACH_END (0 bits)
+ * 00 00 - TOUCH_END (0 bits)
+ *
+ * Since we only support this report config, we just hardcode the format below.
+ * To support additional report configs, we would need to parse the config and
+ * use it to parse the reports dynamically.
+ */
+
+struct tcm_report_point {
+ u8 unknown;
+ u8 buttons;
+ __le32 point; /* idx : 4, class : 4, x : 12, y : 12 */
+ // u8 idx : 4;
+ // u8 classification : 4;
+ // u16 x : 12;
+ // u16 y : 12;
+ u8 z;
+ u8 width_x;
+ u8 width_y;
+ u8 tx;
+ u8 rx;
+} __packed;
+
+static int tcm_handle_touch_report(struct tcm_data *tcm, const char *buf, size_t len)
+{
+ const struct tcm_report_point *point;
+ /* If the input device hasn't registered yet then we can't do anything */
+ if (!tcm->input)
+ return 0;
+
+ buf += sizeof(struct tcm_message_header);
+ len -= sizeof(struct tcm_message_header);
+
+ dev_dbg(&tcm->client->dev, "touch report len %zu\n", len);
+ if ((len - 3) % sizeof(*point))
+ dev_err(&tcm->client->dev, "invalid touch report length\n");
+
+ buf++; /* Skip the FPS report */
+
+ /* We don't need to report releases because we have INPUT_MT_DROP_UNUSED */
+ for (int i = 0; i < (len - 1) / sizeof(*point); i++) {
+ u8 major_width, minor_width;
+ u16 idx, x, y;
+ u32 _point;
+
+ point = (struct tcm_report_point *)buf;
+ _point = le32_to_cpu(point->point);
+
+ minor_width = point->width_x;
+ major_width = point->width_y;
+
+ if (minor_width > major_width)
+ swap(major_width, minor_width);
+
+ idx = _point & 0xf;
+ x = (_point >> 8) & 0xfff;
+ y = (_point >> 20) & 0xfff;
+
+ dev_dbg(&tcm->client->dev, "touch report: idx %u x %u y %u\n",
+ idx, x, y);
+
+ input_mt_slot(tcm->input, idx);
+ input_mt_report_slot_state(tcm->input, MT_TOOL_FINGER, true);
+
+ touchscreen_report_pos(tcm->input, &tcm->props, x, y, true);
+
+ input_report_abs(tcm->input, ABS_MT_TOUCH_MAJOR, major_width);
+ input_report_abs(tcm->input, ABS_MT_TOUCH_MINOR, minor_width);
+ input_report_abs(tcm->input, ABS_MT_PRESSURE, point->z);
+
+ buf += sizeof(*point);
+ }
+
+ input_mt_sync_frame(tcm->input);
+ input_sync(tcm->input);
+
+ return 0;
+}
+
+static irqreturn_t tcm_report_irq(int irq, void *data)
+{
+ struct tcm_data *tcm = data;
+ struct tcm_message_header *header;
+ char buf[256];
+ u16 len;
+ int ret;
+
+ header = (struct tcm_message_header *)buf;
+ ret = tcm_recv_report(tcm, buf, sizeof(buf));
+ if (ret) {
+ dev_err(&tcm->client->dev, "failed to read report: %d\n", ret);
+ return IRQ_HANDLED;
+ }
+
+ switch (header->code) {
+ case REPORT_OK:
+ case REPORT_IDENTIFY:
+ case REPORT_TOUCH:
+ case REPORT_DELTA:
+ case REPORT_RAW:
+ case REPORT_DEBUG:
+ case REPORT_TOUCH_HOLD:
+ break;
+ default:
+ dev_dbg(&tcm->client->dev, "Ignoring report %#x\n", header->code);
+ return IRQ_HANDLED;
+ }
+
+ len = le32_to_cpu(header->length);
+
+ dev_dbg(&tcm->client->dev, "report %#x len %u\n", header->code, len);
+ print_hex_dump_bytes("report: ", DUMP_PREFIX_OFFSET, buf,
+ min(sizeof(buf), len + sizeof(*header)));
+
+ if (len > sizeof(buf) - sizeof(*header)) {
+ dev_err(&tcm->client->dev, "report too long\n");
+ return IRQ_HANDLED;
+ }
+
+ /* Check if this is a read response or an indication. For indications
+ * (user touched the screen) we just parse the report directly.
+ */
+ if (completion_done(&tcm->response) && header->code == REPORT_TOUCH) {
+ tcm_handle_touch_report(tcm, buf, len + sizeof(*header));
+ return IRQ_HANDLED;
+ }
+
+ tcm->buf_size = len + sizeof(*header);
+ memcpy(tcm->buf, buf, len + sizeof(*header));
+ complete(&tcm->response);
+
+ return IRQ_HANDLED;
+}
+
+static int tcm_hw_init(struct tcm_data *tcm, u16 *max_x, u16 *max_y)
+{
+ int ret;
+ struct tcm_identification id = { 0 };
+ struct tcm_app_info app_info = { 0 };
+ u16 status;
+
+ /*
+ * Tell the firmware to start up. After starting it sends an IDENTIFY report, which
+ * we treat like a response to this message even though it's technically a new report.
+ */
+ ret = tcm_read_message(tcm, TCM_RUN_APPLICATION_FIRMWARE, &id, sizeof(id));
+ if (ret) {
+ dev_err(&tcm->client->dev, "failed to identify device: %d\n", ret);
+ return ret;
+ }
+
+ dev_dbg(&tcm->client->dev, "Synaptics TCM %s v%d mode %d\n",
+ id.part_number, id.version, id.mode);
+ if (id.mode != MODE_APPLICATION) {
+ /* We don't support firmware updates or anything else */
+ dev_err(&tcm->client->dev, "Device is not in application mode\n");
+ return -ENODEV;
+ }
+
+ do {
+ msleep(20);
+ ret = tcm_read_message(tcm, TCM_GET_APPLICATION_INFO, &app_info, sizeof(app_info));
+ if (ret) {
+ dev_err(&tcm->client->dev, "failed to get application info: %d\n", ret);
+ return ret;
+ }
+ status = le16_to_cpu(app_info.status);
+ } while (status == APP_STATUS_BOOTING || status == APP_STATUS_UPDATING);
+
+ dev_dbg(&tcm->client->dev, "Application firmware v%d.%d (customer '%s') status %d\n",
+ app_info.version[0], app_info.version[1], app_info.customer_config_id,
+ status);
+
+ *max_x = le16_to_cpu(app_info.max_x);
+ *max_y = le16_to_cpu(app_info.max_y);
+
+ return 0;
+}
+
+static int tcm_power_on(struct tcm_data *tcm)
+{
+ int ret;
+
+ ret = regulator_bulk_enable(ARRAY_SIZE(tcm->supplies),
+ tcm->supplies);
+ if (ret)
+ return ret;
+
+ gpiod_set_value_cansleep(tcm->reset_gpio, 1);
+ usleep_range(10000, 11000);
+ gpiod_set_value_cansleep(tcm->reset_gpio, 0);
+ usleep_range(80000, 81000);
+
+ return 0;
+}
+
+static int tcm_probe(struct i2c_client *client)
+{
+ struct tcm_data *tcm;
+ u16 max_x, max_y;
+ int ret;
+
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C |
+ I2C_FUNC_SMBUS_BYTE_DATA |
+ I2C_FUNC_SMBUS_I2C_BLOCK))
+ return -ENODEV;
+
+ tcm = devm_kzalloc(&client->dev, sizeof(struct tcm_data), GFP_KERNEL);
+ if (!tcm)
+ return -ENOMEM;
+
+ i2c_set_clientdata(client, tcm);
+ tcm->client = client;
+
+ init_completion(&tcm->response);
+
+ tcm->supplies[0].supply = "vdd";
+ tcm->supplies[1].supply = "vcc";
+ ret = devm_regulator_bulk_get(&client->dev, ARRAY_SIZE(tcm->supplies),
+ tcm->supplies);
+ if (ret)
+ return ret;
+
+ tcm->reset_gpio = devm_gpiod_get(&client->dev, "reset", GPIOD_OUT_LOW);
+
+ ret = devm_add_action_or_reset(&client->dev, tcm_power_off,
+ tcm);
+ if (ret)
+ return ret;
+
+ ret = tcm_power_on(tcm);
+ if (ret)
+ return ret;
+
+ ret = devm_request_threaded_irq(&client->dev, client->irq, NULL,
+ tcm_report_irq,
+ IRQF_ONESHOT,
+ "synaptics_tcm_report", tcm);
+ if (ret < 0)
+ return ret;
+
+ ret = tcm_hw_init(tcm, &max_x, &max_y);
+ if (ret) {
+ dev_err(&client->dev, "failed to initialize hardware\n");
+ return ret;
+ }
+
+ tcm->input = devm_input_allocate_device(&client->dev);
+ if (!tcm->input)
+ return -ENOMEM;
+
+ tcm->input->name = "Synaptics TCM Oncell Touchscreen";
+ tcm->input->id.bustype = BUS_I2C;
+ tcm->input->open = tcm_input_open;
+ tcm->input->close = tcm_input_close;
+
+ input_set_abs_params(tcm->input, ABS_MT_POSITION_X, 0, max_x, 0, 0);
+ input_set_abs_params(tcm->input, ABS_MT_POSITION_Y, 0, max_y, 0, 0);
+ input_set_abs_params(tcm->input, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
+ input_set_abs_params(tcm->input, ABS_MT_TOUCH_MINOR, 0, 255, 0, 0);
+ input_set_abs_params(tcm->input, ABS_MT_PRESSURE, 0, 255, 0, 0);
+
+ touchscreen_parse_properties(tcm->input, true, &tcm->props);
+
+ ret = input_mt_init_slots(tcm->input, 10, INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
+ if (ret)
+ return ret;
+
+ input_set_drvdata(tcm->input, tcm);
+
+ ret = input_register_device(tcm->input);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static const struct of_device_id syna_driver_ids[] = {
+ {
+ .compatible = "syna,s3908",
+ },
+ {}
+};
+MODULE_DEVICE_TABLE(of, syna_driver_ids);
+
+static const struct i2c_device_id syna_i2c_ids[] = {
+ { "synaptics-tcm", 0 },
+ { }
+};
+
+MODULE_DEVICE_TABLE(i2c, syna_i2c_ids);
+
+static struct i2c_driver syna_i2c_driver = {
+ .probe = tcm_probe,
+ .id_table = syna_i2c_ids,
+ .driver = {
+ .name = "synaptics-tcm",
+ .of_match_table = syna_driver_ids,
+ },
+};
+
+module_i2c_driver(syna_i2c_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Frieder Hannenheim <frieder.hannenheim@proton.me>");
+MODULE_AUTHOR("Caleb Connolly <caleb@postmarketos.org>");
+MODULE_DESCRIPTION("A driver for Synaptics TCM Oncell Touchpanels");
+
--
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