373 lines
9.9 KiB
Diff
373 lines
9.9 KiB
Diff
From 4feacbc24eea0c5f36728017575cc0ad28d8758b Mon Sep 17 00:00:00 2001
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From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
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Date: Thu, 19 May 2016 09:24:06 -0700
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Subject: [PATCH] Input: add new driver for the Surface 3
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This is a basic driver for the Surface 3. I am not so sure it will work
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with any firmwares as most values are encoded, but given that I only have
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access to my current device with its firmware and I don't have the
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datasheet, it should be OK for now.
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The Surface Pen is not supported (if it is supposed to be). I'll work on
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this when I get one.
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Tested-by: Bastien Nocera <hadess@hadess.net>
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Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
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Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
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---
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drivers/input/touchscreen/Kconfig | 13 ++
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drivers/input/touchscreen/Makefile | 1 +
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drivers/input/touchscreen/surface3_spi.c | 304 +++++++++++++++++++++++++++++++
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3 files changed, 318 insertions(+)
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create mode 100644 drivers/input/touchscreen/surface3_spi.c
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diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
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index 75443bb..c3880b9 100644
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--- a/drivers/input/touchscreen/Kconfig
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+++ b/drivers/input/touchscreen/Kconfig
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@@ -1085,6 +1085,19 @@ config TOUCHSCREEN_SUR40
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To compile this driver as a module, choose M here: the
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module will be called sur40.
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+config TOUCHSCREEN_SURFACE3_SPI
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+ tristate "Ntrig/Microsoft Surface 3 SPI touchscreen"
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+ depends on SPI
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+ depends on GPIOLIB || COMPILE_TEST
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+ help
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+ Say Y here if you have the Ntrig/Microsoft SPI touchscreen
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+ controller chip as found on the Surface 3 in your system.
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+
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+ If unsure, say N.
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+
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+ To compile this driver as a module, choose M here: the
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+ module will be called surface3_spi.
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+
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config TOUCHSCREEN_SX8654
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tristate "Semtech SX8654 touchscreen"
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depends on I2C
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diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
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index 4b518c7..75af04d 100644
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--- a/drivers/input/touchscreen/Makefile
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+++ b/drivers/input/touchscreen/Makefile
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@@ -66,6 +66,7 @@ obj-$(CONFIG_TOUCHSCREEN_ST1232) += st1232.o
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obj-$(CONFIG_TOUCHSCREEN_STMPE) += stmpe-ts.o
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obj-$(CONFIG_TOUCHSCREEN_SUN4I) += sun4i-ts.o
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obj-$(CONFIG_TOUCHSCREEN_SUR40) += sur40.o
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+obj-$(CONFIG_TOUCHSCREEN_SURFACE3_SPI) += surface3_spi.o
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obj-$(CONFIG_TOUCHSCREEN_TI_AM335X_TSC) += ti_am335x_tsc.o
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obj-$(CONFIG_TOUCHSCREEN_TOUCHIT213) += touchit213.o
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obj-$(CONFIG_TOUCHSCREEN_TOUCHRIGHT) += touchright.o
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diff --git a/drivers/input/touchscreen/surface3_spi.c b/drivers/input/touchscreen/surface3_spi.c
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new file mode 100644
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index 0000000..e18e742
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--- /dev/null
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+++ b/drivers/input/touchscreen/surface3_spi.c
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@@ -0,0 +1,304 @@
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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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+
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+/*
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+ * This program is free software; you can redistribute it and/or modify it
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+ * under the terms of the GNU General Public License as published by the Free
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+ * Software Foundation; version 2 of the License.
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+ */
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+
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+#include <linux/kernel.h>
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+
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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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+
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+#include <asm/unaligned.h>
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+
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+#define SURFACE3_PACKET_SIZE 264
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+
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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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+
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+ u8 rd_buf[SURFACE3_PACKET_SIZE] ____cacheline_aligned;
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+};
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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+static void surface3_spi_process(struct surface3_ts_data *ts_data)
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+{
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+ const char header[] = {0xff, 0xff, 0xff, 0xff, 0xa5, 0x5a, 0xe7, 0x7e,
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+ 0x01, 0xd2, 0x00, 0x80, 0x01, 0x03, 0x03};
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+ u8 *data = ts_data->rd_buf;
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+ u16 timestamp;
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+ unsigned int i;
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+
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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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+
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+ timestamp = get_unaligned_le16(&data[15]);
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+
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+ for (i = 0; i < 13; i++) {
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+ struct surface3_ts_data_finger *finger;
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+
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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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+ /*
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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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+
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+ surface3_spi_report_touch(ts_data, finger);
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+ }
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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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+
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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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+
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+ if (surface3_spi_read(data))
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+ return IRQ_HANDLED;
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+
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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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+
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+ return IRQ_HANDLED;
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+}
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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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+/**
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+ * surface3_spi_get_gpio_config - Get GPIO config from ACPI/DT
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+ *
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+ * @ts: 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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+
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+ dev = &data->spi->dev;
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+
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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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+
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+ data->gpiod_rst[i] = gpiod;
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+ }
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+
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+ return 0;
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+}
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+
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+static int surface3_spi_create_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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+
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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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+
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+ data->input_dev = input;
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+
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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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+
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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 = 0x0000;
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+ input->id.version = 0x0000;
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+
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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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+
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+ return 0;
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+}
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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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+
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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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+
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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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+
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+ data->spi = spi;
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+ spi_set_drvdata(spi, data);
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+
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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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+
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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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+
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+ error = surface3_spi_create_input(data);
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+ if (error)
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+ return error;
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+
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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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+
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+ return 0;
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+}
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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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+
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+ disable_irq(data->spi->irq);
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+
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+ surface3_spi_power(data, false);
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+
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+ return 0;
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+}
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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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+
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+ surface3_spi_power(data, true);
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+
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+ enable_irq(data->spi->irq);
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+
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+ return 0;
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+}
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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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+
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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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+
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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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+
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+module_spi_driver(surface3_spi_driver);
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+
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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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--
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2.7.4
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