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320 lines
8.8 KiB
320 lines
8.8 KiB
From 99aaee7d1fde86bd2119d84e90435d89d6d3af07 Mon Sep 17 00:00:00 2001
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From: Ahmet Inan <inan@distec.de>
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Date: Sat, 14 Oct 2017 10:10:53 -0700
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Subject: [PATCH 162/454] Input: add I2C attached EETI EXC3000 multi touch
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driver
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commit 7e577a17f2eefeef32f1106ebf91e7cd143ba654 upstream.
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beware: code adapted to use the old timer API.
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The 3000 series have a new protocol which allows to report up to 5 points
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in a single 66 byte frame. One must always read in 66 byte frames.
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To support up to 10 points, two consecutive frames need to be read:
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The first frame says how many points until sync.
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The second frame must say zero points or both frames must be discarded.
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To be able to work with the higher 400KHz I2C bus rate, one must
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successfully send a special package prior _each_ read or the controller
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will refuse to cooperate.
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This is a minimal implementation based on egalax_i2c.c (which can be found
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on the internet) and egalax_ts.c but without the vendor interface and no
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power management support.
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Signed-off-by: Ahmet Inan <inan@distec.de>
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Acked-by: Rob Herring <robh@kernel.org>
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Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
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---
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.../bindings/input/touchscreen/exc3000.txt | 27 +++
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drivers/input/touchscreen/Kconfig | 10 +
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drivers/input/touchscreen/Makefile | 1 +
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drivers/input/touchscreen/exc3000.c | 223 ++++++++++++++++++
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4 files changed, 261 insertions(+)
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create mode 100644 Documentation/devicetree/bindings/input/touchscreen/exc3000.txt
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create mode 100644 drivers/input/touchscreen/exc3000.c
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--- /dev/null
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+++ b/Documentation/devicetree/bindings/input/touchscreen/exc3000.txt
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@@ -0,0 +1,27 @@
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+* EETI EXC3000 Multiple Touch Controller
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+
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+Required properties:
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+- compatible: must be "eeti,exc3000"
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+- reg: i2c slave address
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+- interrupt-parent: the phandle for the interrupt controller
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+- interrupts: touch controller interrupt
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+- touchscreen-size-x: See touchscreen.txt
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+- touchscreen-size-y: See touchscreen.txt
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+
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+Optional properties:
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+- touchscreen-inverted-x: See touchscreen.txt
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+- touchscreen-inverted-y: See touchscreen.txt
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+- touchscreen-swapped-x-y: See touchscreen.txt
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+
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+Example:
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+
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+ touchscreen@2a {
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+ compatible = "eeti,exc3000";
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+ reg = <0x2a>;
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+ interrupt-parent = <&gpio1>;
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+ interrupts = <9 IRQ_TYPE_LEVEL_LOW>;
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+ touchscreen-size-x = <4096>;
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+ touchscreen-size-y = <4096>;
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+ touchscreen-inverted-x;
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+ touchscreen-swapped-x-y;
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+ };
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--- a/drivers/input/touchscreen/Kconfig
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+++ b/drivers/input/touchscreen/Kconfig
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@@ -316,6 +316,16 @@ config TOUCHSCREEN_EGALAX_SERIAL
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To compile this driver as a module, choose M here: the
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module will be called egalax_ts_serial.
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+config TOUCHSCREEN_EXC3000
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+ tristate "EETI EXC3000 multi-touch panel support"
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+ depends on I2C
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+ help
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+ Say Y here to enable support for I2C connected EETI
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+ EXC3000 multi-touch panels.
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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 exc3000.
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+
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config TOUCHSCREEN_FUJITSU
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tristate "Fujitsu serial touchscreen"
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select SERIO
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--- a/drivers/input/touchscreen/Makefile
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+++ b/drivers/input/touchscreen/Makefile
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@@ -39,6 +39,7 @@ obj-$(CONFIG_TOUCHSCREEN_ELAN) += elant
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obj-$(CONFIG_TOUCHSCREEN_ELO) += elo.o
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obj-$(CONFIG_TOUCHSCREEN_EGALAX) += egalax_ts.o
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obj-$(CONFIG_TOUCHSCREEN_EGALAX_SERIAL) += egalax_ts_serial.o
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+obj-$(CONFIG_TOUCHSCREEN_EXC3000) += exc3000.o
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obj-$(CONFIG_TOUCHSCREEN_FUJITSU) += fujitsu_ts.o
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obj-$(CONFIG_TOUCHSCREEN_GOODIX) += goodix.o
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obj-$(CONFIG_TOUCHSCREEN_ILI210X) += ili210x.o
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--- /dev/null
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+++ b/drivers/input/touchscreen/exc3000.c
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@@ -0,0 +1,223 @@
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+/*
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+ * Driver for I2C connected EETI EXC3000 multiple touch controller
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+ *
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+ * Copyright (C) 2017 Ahmet Inan <inan@distec.de>
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+ *
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+ * minimal implementation based on egalax_ts.c and egalax_i2c.c
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2 as
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+ * published by the Free Software Foundation.
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+ */
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+
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+#include <linux/bitops.h>
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+#include <linux/device.h>
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+#include <linux/i2c.h>
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+#include <linux/input.h>
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+#include <linux/input/mt.h>
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+#include <linux/input/touchscreen.h>
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+#include <linux/interrupt.h>
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+#include <linux/module.h>
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+#include <linux/of.h>
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+#include <linux/timer.h>
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+#include <asm/unaligned.h>
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+
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+#define EXC3000_NUM_SLOTS 10
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+#define EXC3000_SLOTS_PER_FRAME 5
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+#define EXC3000_LEN_FRAME 66
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+#define EXC3000_LEN_POINT 10
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+#define EXC3000_MT_EVENT 6
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+#define EXC3000_TIMEOUT_MS 100
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+
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+struct exc3000_data {
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+ struct i2c_client *client;
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+ struct input_dev *input;
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+ struct touchscreen_properties prop;
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+ struct timer_list timer;
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+ u8 buf[2 * EXC3000_LEN_FRAME];
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+};
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+
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+static void exc3000_report_slots(struct input_dev *input,
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+ struct touchscreen_properties *prop,
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+ const u8 *buf, int num)
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+{
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+ for (; num--; buf += EXC3000_LEN_POINT) {
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+ if (buf[0] & BIT(0)) {
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+ input_mt_slot(input, buf[1]);
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+ input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
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+ touchscreen_report_pos(input, prop,
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+ get_unaligned_le16(buf + 2),
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+ get_unaligned_le16(buf + 4),
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+ true);
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+ }
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+ }
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+}
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+
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+static void exc3000_timer(unsigned long d)
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+{
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+ struct exc3000_data *data = (void *)d;
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+
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+ input_mt_sync_frame(data->input);
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+ input_sync(data->input);
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+}
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+
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+static int exc3000_read_frame(struct i2c_client *client, u8 *buf)
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+{
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+ int ret;
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+
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+ ret = i2c_master_send(client, "'", 2);
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+ if (ret < 0)
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+ return ret;
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+
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+ if (ret != 2)
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+ return -EIO;
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+
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+ ret = i2c_master_recv(client, buf, EXC3000_LEN_FRAME);
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+ if (ret < 0)
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+ return ret;
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+
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+ if (ret != EXC3000_LEN_FRAME)
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+ return -EIO;
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+
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+ if (get_unaligned_le16(buf) != EXC3000_LEN_FRAME ||
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+ buf[2] != EXC3000_MT_EVENT)
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+ return -EINVAL;
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+
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+ return 0;
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+}
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+
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+static int exc3000_read_data(struct i2c_client *client,
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+ u8 *buf, int *n_slots)
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+{
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+ int error;
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+
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+ error = exc3000_read_frame(client, buf);
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+ if (error)
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+ return error;
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+
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+ *n_slots = buf[3];
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+ if (!*n_slots || *n_slots > EXC3000_NUM_SLOTS)
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+ return -EINVAL;
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+
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+ if (*n_slots > EXC3000_SLOTS_PER_FRAME) {
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+ /* Read 2nd frame to get the rest of the contacts. */
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+ error = exc3000_read_frame(client, buf + EXC3000_LEN_FRAME);
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+ if (error)
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+ return error;
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+
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+ /* 2nd chunk must have number of contacts set to 0. */
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+ if (buf[EXC3000_LEN_FRAME + 3] != 0)
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+ return -EINVAL;
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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 irqreturn_t exc3000_interrupt(int irq, void *dev_id)
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+{
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+ struct exc3000_data *data = dev_id;
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+ struct input_dev *input = data->input;
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+ u8 *buf = data->buf;
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+ int slots, total_slots;
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+ int error;
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+
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+ error = exc3000_read_data(data->client, buf, &total_slots);
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+ if (error) {
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+ /* Schedule a timer to release "stuck" contacts */
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+ mod_timer(&data->timer,
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+ jiffies + msecs_to_jiffies(EXC3000_TIMEOUT_MS));
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+ goto out;
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+ }
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+
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+ /*
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+ * We read full state successfully, no contacts will be "stuck".
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+ */
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+ del_timer_sync(&data->timer);
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+
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+ while (total_slots > 0) {
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+ slots = min(total_slots, EXC3000_SLOTS_PER_FRAME);
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+ exc3000_report_slots(input, &data->prop, buf + 4, slots);
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+ total_slots -= slots;
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+ buf += EXC3000_LEN_FRAME;
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+ }
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+
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+ input_mt_sync_frame(input);
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+ input_sync(input);
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+
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+out:
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+ return IRQ_HANDLED;
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+}
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+
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+static int exc3000_probe(struct i2c_client *client,
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+ const struct i2c_device_id *id)
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+{
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+ struct exc3000_data *data;
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+ struct input_dev *input;
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+ int error;
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+
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+ data = devm_kzalloc(&client->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->client = client;
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+ setup_timer(&data->timer, exc3000_timer, (unsigned long)data);
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+
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+ input = devm_input_allocate_device(&client->dev);
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+ if (!input)
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+ return -ENOMEM;
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+
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+ data->input = input;
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+
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+ input->name = "EETI EXC3000 Touch Screen";
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+ input->id.bustype = BUS_I2C;
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+
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+ input_set_abs_params(input, ABS_MT_POSITION_X, 0, 4095, 0, 0);
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+ input_set_abs_params(input, ABS_MT_POSITION_Y, 0, 4095, 0, 0);
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+ touchscreen_parse_properties(input, true, &data->prop);
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+
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+ error = input_mt_init_slots(input, EXC3000_NUM_SLOTS,
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+ INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
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+ if (error)
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+ return error;
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+
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+ error = input_register_device(input);
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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(&client->dev, client->irq,
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+ NULL, exc3000_interrupt, IRQF_ONESHOT,
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+ client->name, 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 const struct i2c_device_id exc3000_id[] = {
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+ { "exc3000", 0 },
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+ { }
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+};
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+MODULE_DEVICE_TABLE(i2c, exc3000_id);
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+
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+#ifdef CONFIG_OF
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+static const struct of_device_id exc3000_of_match[] = {
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+ { .compatible = "eeti,exc3000" },
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+ { }
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+};
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+MODULE_DEVICE_TABLE(of, exc3000_of_match);
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+#endif
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+
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+static struct i2c_driver exc3000_driver = {
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+ .driver = {
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+ .name = "exc3000",
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+ .of_match_table = of_match_ptr(exc3000_of_match),
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+ },
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+ .id_table = exc3000_id,
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+ .probe = exc3000_probe,
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+};
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+
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+module_i2c_driver(exc3000_driver);
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+
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+MODULE_AUTHOR("Ahmet Inan <inan@distec.de>");
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+MODULE_DESCRIPTION("I2C connected EETI EXC3000 multiple touch controller driver");
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+MODULE_LICENSE("GPL v2");
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