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/*
* Driver for Ntrig/Microsoft Touchscreens over SPI
*
* Copyright (c) 2016 Red Hat Inc.
*/
/*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; version 2 of the License.
*/
#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)
{
u16 timestamp;
unsigned int i;
timestamp = get_unaligned_le16(&data[15]);
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)
{
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
*
* @ts: 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");