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