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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/input/touchscreen/surface3_spi.c | |
parent | Initial commit. (diff) | |
download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/input/touchscreen/surface3_spi.c')
-rw-r--r-- | drivers/input/touchscreen/surface3_spi.c | 421 |
1 files changed, 421 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/surface3_spi.c b/drivers/input/touchscreen/surface3_spi.c new file mode 100644 index 000000000..1da23e558 --- /dev/null +++ b/drivers/input/touchscreen/surface3_spi.c @@ -0,0 +1,421 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Driver for Ntrig/Microsoft Touchscreens over SPI + * + * Copyright (c) 2016 Red Hat Inc. + */ + + +#include <linux/kernel.h> + +#include <linux/delay.h> +#include <linux/gpio/consumer.h> +#include <linux/input.h> +#include <linux/input/mt.h> +#include <linux/interrupt.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/spi/spi.h> +#include <linux/acpi.h> + +#include <asm/unaligned.h> + +#define SURFACE3_PACKET_SIZE 264 + +#define SURFACE3_REPORT_TOUCH 0xd2 +#define SURFACE3_REPORT_PEN 0x16 + +struct surface3_ts_data { + struct spi_device *spi; + struct gpio_desc *gpiod_rst[2]; + struct input_dev *input_dev; + struct input_dev *pen_input_dev; + int pen_tool; + + u8 rd_buf[SURFACE3_PACKET_SIZE] ____cacheline_aligned; +}; + +struct surface3_ts_data_finger { + u8 status; + __le16 tracking_id; + __le16 x; + __le16 cx; + __le16 y; + __le16 cy; + __le16 width; + __le16 height; + u32 padding; +} __packed; + +struct surface3_ts_data_pen { + u8 status; + __le16 x; + __le16 y; + __le16 pressure; + u8 padding; +} __packed; + +static int surface3_spi_read(struct surface3_ts_data *ts_data) +{ + struct spi_device *spi = ts_data->spi; + + memset(ts_data->rd_buf, 0, sizeof(ts_data->rd_buf)); + return spi_read(spi, ts_data->rd_buf, sizeof(ts_data->rd_buf)); +} + +static void surface3_spi_report_touch(struct surface3_ts_data *ts_data, + struct surface3_ts_data_finger *finger) +{ + int st = finger->status & 0x01; + int slot; + + slot = input_mt_get_slot_by_key(ts_data->input_dev, + get_unaligned_le16(&finger->tracking_id)); + if (slot < 0) + return; + + input_mt_slot(ts_data->input_dev, slot); + input_mt_report_slot_state(ts_data->input_dev, MT_TOOL_FINGER, st); + if (st) { + input_report_abs(ts_data->input_dev, + ABS_MT_POSITION_X, + get_unaligned_le16(&finger->x)); + input_report_abs(ts_data->input_dev, + ABS_MT_POSITION_Y, + get_unaligned_le16(&finger->y)); + input_report_abs(ts_data->input_dev, + ABS_MT_WIDTH_MAJOR, + get_unaligned_le16(&finger->width)); + input_report_abs(ts_data->input_dev, + ABS_MT_WIDTH_MINOR, + get_unaligned_le16(&finger->height)); + } +} + +static void surface3_spi_process_touch(struct surface3_ts_data *ts_data, u8 *data) +{ + unsigned int i; + + for (i = 0; i < 13; i++) { + struct surface3_ts_data_finger *finger; + + finger = (struct surface3_ts_data_finger *)&data[17 + + i * sizeof(struct surface3_ts_data_finger)]; + + /* + * When bit 5 of status is 1, it marks the end of the report: + * - touch present: 0xe7 + * - touch released: 0xe4 + * - nothing valuable: 0xff + */ + if (finger->status & 0x10) + break; + + surface3_spi_report_touch(ts_data, finger); + } + + input_mt_sync_frame(ts_data->input_dev); + input_sync(ts_data->input_dev); +} + +static void surface3_spi_report_pen(struct surface3_ts_data *ts_data, + struct surface3_ts_data_pen *pen) +{ + struct input_dev *dev = ts_data->pen_input_dev; + int st = pen->status; + int prox = st & 0x01; + int rubber = st & 0x18; + int tool = (prox && rubber) ? BTN_TOOL_RUBBER : BTN_TOOL_PEN; + + /* fake proximity out to switch tools */ + if (ts_data->pen_tool != tool) { + input_report_key(dev, ts_data->pen_tool, 0); + input_sync(dev); + ts_data->pen_tool = tool; + } + + input_report_key(dev, BTN_TOUCH, st & 0x12); + + input_report_key(dev, ts_data->pen_tool, prox); + + if (st) { + input_report_key(dev, + BTN_STYLUS, + st & 0x04); + + input_report_abs(dev, + ABS_X, + get_unaligned_le16(&pen->x)); + input_report_abs(dev, + ABS_Y, + get_unaligned_le16(&pen->y)); + input_report_abs(dev, + ABS_PRESSURE, + get_unaligned_le16(&pen->pressure)); + } +} + +static void surface3_spi_process_pen(struct surface3_ts_data *ts_data, u8 *data) +{ + struct surface3_ts_data_pen *pen; + + pen = (struct surface3_ts_data_pen *)&data[15]; + + surface3_spi_report_pen(ts_data, pen); + input_sync(ts_data->pen_input_dev); +} + +static void surface3_spi_process(struct surface3_ts_data *ts_data) +{ + static const char header[] = { + 0xff, 0xff, 0xff, 0xff, 0xa5, 0x5a, 0xe7, 0x7e, 0x01 + }; + u8 *data = ts_data->rd_buf; + + if (memcmp(header, data, sizeof(header))) + dev_err(&ts_data->spi->dev, + "%s header error: %*ph, ignoring...\n", + __func__, (int)sizeof(header), data); + + switch (data[9]) { + case SURFACE3_REPORT_TOUCH: + surface3_spi_process_touch(ts_data, data); + break; + case SURFACE3_REPORT_PEN: + surface3_spi_process_pen(ts_data, data); + break; + default: + dev_err(&ts_data->spi->dev, + "%s unknown packet type: %x, ignoring...\n", + __func__, data[9]); + break; + } +} + +static irqreturn_t surface3_spi_irq_handler(int irq, void *dev_id) +{ + struct surface3_ts_data *data = dev_id; + + if (surface3_spi_read(data)) + return IRQ_HANDLED; + + dev_dbg(&data->spi->dev, "%s received -> %*ph\n", + __func__, SURFACE3_PACKET_SIZE, data->rd_buf); + surface3_spi_process(data); + + return IRQ_HANDLED; +} + +static void surface3_spi_power(struct surface3_ts_data *data, bool on) +{ + gpiod_set_value(data->gpiod_rst[0], on); + gpiod_set_value(data->gpiod_rst[1], on); + /* let the device settle a little */ + msleep(20); +} + +/** + * surface3_spi_get_gpio_config - Get GPIO config from ACPI/DT + * + * @data: surface3_spi_ts_data pointer + */ +static int surface3_spi_get_gpio_config(struct surface3_ts_data *data) +{ + int error; + struct device *dev; + struct gpio_desc *gpiod; + int i; + + dev = &data->spi->dev; + + /* Get the reset lines GPIO pin number */ + for (i = 0; i < 2; i++) { + gpiod = devm_gpiod_get_index(dev, NULL, i, GPIOD_OUT_LOW); + if (IS_ERR(gpiod)) { + error = PTR_ERR(gpiod); + if (error != -EPROBE_DEFER) + dev_err(dev, + "Failed to get power GPIO %d: %d\n", + i, + error); + return error; + } + + data->gpiod_rst[i] = gpiod; + } + + return 0; +} + +static int surface3_spi_create_touch_input(struct surface3_ts_data *data) +{ + struct input_dev *input; + int error; + + input = devm_input_allocate_device(&data->spi->dev); + if (!input) + return -ENOMEM; + + data->input_dev = input; + + input_set_abs_params(input, ABS_MT_POSITION_X, 0, 9600, 0, 0); + input_abs_set_res(input, ABS_MT_POSITION_X, 40); + input_set_abs_params(input, ABS_MT_POSITION_Y, 0, 7200, 0, 0); + input_abs_set_res(input, ABS_MT_POSITION_Y, 48); + input_set_abs_params(input, ABS_MT_WIDTH_MAJOR, 0, 1024, 0, 0); + input_set_abs_params(input, ABS_MT_WIDTH_MINOR, 0, 1024, 0, 0); + input_mt_init_slots(input, 10, INPUT_MT_DIRECT); + + input->name = "Surface3 SPI Capacitive TouchScreen"; + input->phys = "input/ts"; + input->id.bustype = BUS_SPI; + input->id.vendor = 0x045e; /* Microsoft */ + input->id.product = 0x0001; + input->id.version = 0x0000; + + error = input_register_device(input); + if (error) { + dev_err(&data->spi->dev, + "Failed to register input device: %d", error); + return error; + } + + return 0; +} + +static int surface3_spi_create_pen_input(struct surface3_ts_data *data) +{ + struct input_dev *input; + int error; + + input = devm_input_allocate_device(&data->spi->dev); + if (!input) + return -ENOMEM; + + data->pen_input_dev = input; + data->pen_tool = BTN_TOOL_PEN; + + __set_bit(INPUT_PROP_DIRECT, input->propbit); + __set_bit(INPUT_PROP_POINTER, input->propbit); + input_set_abs_params(input, ABS_X, 0, 9600, 0, 0); + input_abs_set_res(input, ABS_X, 40); + input_set_abs_params(input, ABS_Y, 0, 7200, 0, 0); + input_abs_set_res(input, ABS_Y, 48); + input_set_abs_params(input, ABS_PRESSURE, 0, 1024, 0, 0); + input_set_capability(input, EV_KEY, BTN_TOUCH); + input_set_capability(input, EV_KEY, BTN_STYLUS); + input_set_capability(input, EV_KEY, BTN_TOOL_PEN); + input_set_capability(input, EV_KEY, BTN_TOOL_RUBBER); + + input->name = "Surface3 SPI Pen Input"; + input->phys = "input/ts"; + input->id.bustype = BUS_SPI; + input->id.vendor = 0x045e; /* Microsoft */ + input->id.product = 0x0002; + input->id.version = 0x0000; + + error = input_register_device(input); + if (error) { + dev_err(&data->spi->dev, + "Failed to register input device: %d", error); + return error; + } + + return 0; +} + +static int surface3_spi_probe(struct spi_device *spi) +{ + struct surface3_ts_data *data; + int error; + + /* Set up SPI*/ + spi->bits_per_word = 8; + spi->mode = SPI_MODE_0; + error = spi_setup(spi); + if (error) + return error; + + data = devm_kzalloc(&spi->dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->spi = spi; + spi_set_drvdata(spi, data); + + error = surface3_spi_get_gpio_config(data); + if (error) + return error; + + surface3_spi_power(data, true); + surface3_spi_power(data, false); + surface3_spi_power(data, true); + + error = surface3_spi_create_touch_input(data); + if (error) + return error; + + error = surface3_spi_create_pen_input(data); + if (error) + return error; + + error = devm_request_threaded_irq(&spi->dev, spi->irq, + NULL, surface3_spi_irq_handler, + IRQF_ONESHOT, + "Surface3-irq", data); + if (error) + return error; + + return 0; +} + +static int __maybe_unused surface3_spi_suspend(struct device *dev) +{ + struct spi_device *spi = to_spi_device(dev); + struct surface3_ts_data *data = spi_get_drvdata(spi); + + disable_irq(data->spi->irq); + + surface3_spi_power(data, false); + + return 0; +} + +static int __maybe_unused surface3_spi_resume(struct device *dev) +{ + struct spi_device *spi = to_spi_device(dev); + struct surface3_ts_data *data = spi_get_drvdata(spi); + + surface3_spi_power(data, true); + + enable_irq(data->spi->irq); + + return 0; +} + +static SIMPLE_DEV_PM_OPS(surface3_spi_pm_ops, + surface3_spi_suspend, + surface3_spi_resume); + +#ifdef CONFIG_ACPI +static const struct acpi_device_id surface3_spi_acpi_match[] = { + { "MSHW0037", 0 }, + { } +}; +MODULE_DEVICE_TABLE(acpi, surface3_spi_acpi_match); +#endif + +static struct spi_driver surface3_spi_driver = { + .driver = { + .name = "Surface3-spi", + .acpi_match_table = ACPI_PTR(surface3_spi_acpi_match), + .pm = &surface3_spi_pm_ops, + }, + .probe = surface3_spi_probe, +}; + +module_spi_driver(surface3_spi_driver); + +MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>"); +MODULE_DESCRIPTION("Surface 3 SPI touchscreen driver"); +MODULE_LICENSE("GPL v2"); |