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290 lines
8.0 KiB
290 lines
8.0 KiB
From e6cf054ec136973f863fb31684453c37aef9c616 Mon Sep 17 00:00:00 2001
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From: Gordon Hollingworth <gordon@raspberrypi.org>
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Date: Tue, 12 May 2015 14:47:56 +0100
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Subject: [PATCH] rpi-ft5406: Add touchscreen driver for pi LCD display
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Fix driver detection failure Check that the buffer response is non-zero meaning the touchscreen was detected
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rpi-ft5406: Use firmware API
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---
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drivers/input/touchscreen/Kconfig | 7 +
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drivers/input/touchscreen/Makefile | 1 +
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drivers/input/touchscreen/rpi-ft5406.c | 246 +++++++++++++++++++++++++++++++++
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3 files changed, 254 insertions(+)
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create mode 100644 drivers/input/touchscreen/rpi-ft5406.c
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--- a/drivers/input/touchscreen/Kconfig
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+++ b/drivers/input/touchscreen/Kconfig
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@@ -608,6 +608,13 @@ config TOUCHSCREEN_EDT_FT5X06
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To compile this driver as a module, choose M here: the
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module will be called edt-ft5x06.
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+config TOUCHSCREEN_RPI_FT5406
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+ tristate "Raspberry Pi FT5406 driver"
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+ depends on RASPBERRYPI_FIRMWARE
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+ help
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+ Say Y here to enable the Raspberry Pi memory based FT5406 device
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+
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+
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config TOUCHSCREEN_MIGOR
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tristate "Renesas MIGO-R touchscreen"
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depends on SH_MIGOR && I2C
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--- a/drivers/input/touchscreen/Makefile
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+++ b/drivers/input/touchscreen/Makefile
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@@ -29,6 +29,7 @@ obj-$(CONFIG_TOUCHSCREEN_DA9034) += da90
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obj-$(CONFIG_TOUCHSCREEN_DA9052) += da9052_tsi.o
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obj-$(CONFIG_TOUCHSCREEN_DYNAPRO) += dynapro.o
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obj-$(CONFIG_TOUCHSCREEN_EDT_FT5X06) += edt-ft5x06.o
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+obj-$(CONFIG_TOUCHSCREEN_RPI_FT5406) += rpi-ft5406.o
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obj-$(CONFIG_TOUCHSCREEN_HAMPSHIRE) += hampshire.o
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obj-$(CONFIG_TOUCHSCREEN_GUNZE) += gunze.o
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obj-$(CONFIG_TOUCHSCREEN_EETI) += eeti_ts.o
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--- /dev/null
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+++ b/drivers/input/touchscreen/rpi-ft5406.c
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@@ -0,0 +1,246 @@
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+/*
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+ * Driver for memory based ft5406 touchscreen
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+ *
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+ * Copyright (C) 2015 Raspberry Pi
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+ *
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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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+
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+#include <linux/module.h>
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+#include <linux/interrupt.h>
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+#include <linux/input.h>
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+#include <linux/irq.h>
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+#include <linux/delay.h>
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+#include <linux/slab.h>
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+#include <linux/bitops.h>
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+#include <linux/input/mt.h>
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+#include <linux/kthread.h>
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+#include <linux/platform_device.h>
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+#include <asm/io.h>
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+#include <soc/bcm2835/raspberrypi-firmware.h>
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+
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+#define MAXIMUM_SUPPORTED_POINTS 10
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+struct ft5406_regs {
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+ uint8_t device_mode;
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+ uint8_t gesture_id;
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+ uint8_t num_points;
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+ struct ft5406_touch {
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+ uint8_t xh;
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+ uint8_t xl;
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+ uint8_t yh;
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+ uint8_t yl;
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+ uint8_t res1;
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+ uint8_t res2;
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+ } point[MAXIMUM_SUPPORTED_POINTS];
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+};
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+
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+#define SCREEN_WIDTH 800
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+#define SCREEN_HEIGHT 480
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+
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+struct ft5406 {
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+ struct platform_device * pdev;
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+ struct input_dev * input_dev;
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+ void __iomem * ts_base;
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+ struct ft5406_regs * regs;
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+ struct task_struct * thread;
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+};
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+
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+/* Thread to poll for touchscreen events
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+ *
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+ * This thread polls the memory based register copy of the ft5406 registers
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+ * using the number of points register to know whether the copy has been
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+ * updated (we write 99 to the memory copy, the GPU will write between
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+ * 0 - 10 points)
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+ */
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+static int ft5406_thread(void *arg)
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+{
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+ struct ft5406 *ts = (struct ft5406 *) arg;
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+ struct ft5406_regs regs;
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+ int known_ids = 0;
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+
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+ while(!kthread_should_stop())
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+ {
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+ // 60fps polling
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+ msleep_interruptible(17);
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+ memcpy_fromio(®s, ts->regs, sizeof(*ts->regs));
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+ writel(99, &ts->regs->num_points);
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+ // Do not output if theres no new information (num_points is 99)
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+ // or we have no touch points and don't need to release any
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+ if(!(regs.num_points == 99 || (regs.num_points == 0 && known_ids == 0)))
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+ {
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+ int i;
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+ int modified_ids = 0, released_ids;
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+ for(i = 0; i < regs.num_points; i++)
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+ {
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+ int x = (((int) regs.point[i].xh & 0xf) << 8) + regs.point[i].xl;
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+ int y = (((int) regs.point[i].yh & 0xf) << 8) + regs.point[i].yl;
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+ int touchid = (regs.point[i].yh >> 4) & 0xf;
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+
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+ modified_ids |= 1 << touchid;
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+
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+ if(!((1 << touchid) & known_ids))
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+ dev_dbg(&ts->pdev->dev, "x = %d, y = %d, touchid = %d\n", x, y, touchid);
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+
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+ input_mt_slot(ts->input_dev, touchid);
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+ input_mt_report_slot_state(ts->input_dev, MT_TOOL_FINGER, 1);
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+
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+ input_report_abs(ts->input_dev, ABS_MT_POSITION_X, x);
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+ input_report_abs(ts->input_dev, ABS_MT_POSITION_Y, y);
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+
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+ }
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+
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+ released_ids = known_ids & ~modified_ids;
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+ for(i = 0; released_ids && i < MAXIMUM_SUPPORTED_POINTS; i++)
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+ {
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+ if(released_ids & (1<<i))
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+ {
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+ dev_dbg(&ts->pdev->dev, "Released %d, known = %x modified = %x\n", i, known_ids, modified_ids);
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+ input_mt_slot(ts->input_dev, i);
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+ input_mt_report_slot_state(ts->input_dev, MT_TOOL_FINGER, 0);
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+ modified_ids &= ~(1 << i);
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+ }
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+ }
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+ known_ids = modified_ids;
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+
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+ input_mt_report_pointer_emulation(ts->input_dev, true);
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+ input_sync(ts->input_dev);
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+ }
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+
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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 ft5406_probe(struct platform_device *pdev)
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+{
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+ int ret;
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+ struct input_dev * input_dev = input_allocate_device();
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+ struct ft5406 * ts;
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+ struct device_node *fw_node;
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+ struct rpi_firmware *fw;
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+ u32 touchbuf;
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+
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+ dev_info(&pdev->dev, "Probing device\n");
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+
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+ fw_node = of_parse_phandle(pdev->dev.of_node, "firmware", 0);
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+ if (!fw_node) {
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+ dev_err(&pdev->dev, "Missing firmware node\n");
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+ return -ENOENT;
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+ }
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+
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+ fw = rpi_firmware_get(fw_node);
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+ if (!fw)
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+ return -EPROBE_DEFER;
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+
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+ ret = rpi_firmware_property(fw, RPI_FIRMWARE_FRAMEBUFFER_GET_TOUCHBUF,
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+ &touchbuf, sizeof(touchbuf));
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+ if (ret) {
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+ dev_err(&pdev->dev, "Failed to get touch buffer\n");
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+ return ret;
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+ }
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+
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+ if (!touchbuf) {
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+ dev_err(&pdev->dev, "Touchscreen not detected\n");
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+ return -ENODEV;
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+ }
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+
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+ dev_dbg(&pdev->dev, "Got TS buffer 0x%x\n", touchbuf);
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+
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+ ts = kzalloc(sizeof(struct ft5406), GFP_KERNEL);
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+
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+ if (!ts || !input_dev) {
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+ ret = -ENOMEM;
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+ dev_err(&pdev->dev, "Failed to allocate memory\n");
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+ return ret;
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+ }
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+ ts->input_dev = input_dev;
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+ platform_set_drvdata(pdev, ts);
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+ ts->pdev = pdev;
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+
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+ input_dev->name = "FT5406 memory based driver";
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+
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+ __set_bit(EV_KEY, input_dev->evbit);
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+ __set_bit(EV_SYN, input_dev->evbit);
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+ __set_bit(EV_ABS, input_dev->evbit);
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+
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+ input_set_abs_params(input_dev, ABS_MT_POSITION_X, 0,
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+ SCREEN_WIDTH, 0, 0);
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+ input_set_abs_params(input_dev, ABS_MT_POSITION_Y, 0,
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+ SCREEN_HEIGHT, 0, 0);
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+
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+ input_mt_init_slots(input_dev, MAXIMUM_SUPPORTED_POINTS, INPUT_MT_DIRECT);
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+
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+ input_set_drvdata(input_dev, ts);
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+
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+ ret = input_register_device(input_dev);
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+ if (ret) {
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+ dev_err(&pdev->dev, "could not register input device, %d\n",
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+ ret);
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+ return ret;
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+ }
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+
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+ // mmap the physical memory
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+ touchbuf &= ~0xc0000000;
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+ ts->ts_base = ioremap(touchbuf, sizeof(*ts->regs));
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+ if(ts->ts_base == NULL)
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+ {
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+ dev_err(&pdev->dev, "Failed to map physical address\n");
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+ input_unregister_device(input_dev);
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+ kzfree(ts);
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+ return -ENOMEM;
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+ }
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+
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+ ts->regs = (struct ft5406_regs *) ts->ts_base;
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+
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+ // create thread to poll the touch events
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+ ts->thread = kthread_run(ft5406_thread, ts, "ft5406");
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+ if(ts->thread == NULL)
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+ {
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+ dev_err(&pdev->dev, "Failed to create kernel thread");
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+ iounmap(ts->ts_base);
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+ input_unregister_device(input_dev);
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+ kzfree(ts);
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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 ft5406_remove(struct platform_device *pdev)
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+{
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+ struct ft5406 *ts = (struct ft5406 *) platform_get_drvdata(pdev);
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+
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+ dev_info(&pdev->dev, "Removing rpi-ft5406\n");
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+
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+ kthread_stop(ts->thread);
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+ iounmap(ts->ts_base);
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+ input_unregister_device(ts->input_dev);
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+ kzfree(ts);
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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 of_device_id ft5406_match[] = {
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+ { .compatible = "rpi,rpi-ft5406", },
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+ {},
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+};
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+MODULE_DEVICE_TABLE(of, ft5406_match);
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+
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+static struct platform_driver ft5406_driver = {
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+ .driver = {
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+ .name = "rpi-ft5406",
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+ .owner = THIS_MODULE,
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+ .of_match_table = ft5406_match,
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+ },
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+ .probe = ft5406_probe,
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+ .remove = ft5406_remove,
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+};
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+
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+module_platform_driver(ft5406_driver);
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+
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+MODULE_AUTHOR("Gordon Hollingworth");
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+MODULE_DESCRIPTION("Touchscreen driver for memory based FT5406");
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+MODULE_LICENSE("GPL");
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