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openwrt/target/linux/brcm2708/patches-4.4/0078-rpi-ft5406-Add-touchsc...

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From 6910ec0ffdad51f2a970f8080545c3ce621f3042 Mon Sep 17 00:00:00 2001
From: Gordon Hollingworth <gordon@raspberrypi.org>
Date: Tue, 12 May 2015 14:47:56 +0100
Subject: [PATCH 078/423] rpi-ft5406: Add touchscreen driver for pi LCD display
Fix driver detection failure Check that the buffer response is non-zero meaning the touchscreen was detected
rpi-ft5406: Use firmware API
---
drivers/input/touchscreen/Kconfig | 7 +
drivers/input/touchscreen/Makefile | 1 +
drivers/input/touchscreen/rpi-ft5406.c | 246 +++++++++++++++++++++++++++++++++
3 files changed, 254 insertions(+)
create mode 100644 drivers/input/touchscreen/rpi-ft5406.c
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -608,6 +608,13 @@ config TOUCHSCREEN_EDT_FT5X06
To compile this driver as a module, choose M here: the
module will be called edt-ft5x06.
+config TOUCHSCREEN_RPI_FT5406
+ tristate "Raspberry Pi FT5406 driver"
+ depends on RASPBERRYPI_FIRMWARE
+ help
+ Say Y here to enable the Raspberry Pi memory based FT5406 device
+
+
config TOUCHSCREEN_MIGOR
tristate "Renesas MIGO-R touchscreen"
depends on SH_MIGOR && I2C
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -29,6 +29,7 @@ obj-$(CONFIG_TOUCHSCREEN_DA9034) += da90
obj-$(CONFIG_TOUCHSCREEN_DA9052) += da9052_tsi.o
obj-$(CONFIG_TOUCHSCREEN_DYNAPRO) += dynapro.o
obj-$(CONFIG_TOUCHSCREEN_EDT_FT5X06) += edt-ft5x06.o
+obj-$(CONFIG_TOUCHSCREEN_RPI_FT5406) += rpi-ft5406.o
obj-$(CONFIG_TOUCHSCREEN_HAMPSHIRE) += hampshire.o
obj-$(CONFIG_TOUCHSCREEN_GUNZE) += gunze.o
obj-$(CONFIG_TOUCHSCREEN_EETI) += eeti_ts.o
--- /dev/null
+++ b/drivers/input/touchscreen/rpi-ft5406.c
@@ -0,0 +1,246 @@
+/*
+ * Driver for memory based ft5406 touchscreen
+ *
+ * Copyright (C) 2015 Raspberry Pi
+ *
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/input.h>
+#include <linux/irq.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/bitops.h>
+#include <linux/input/mt.h>
+#include <linux/kthread.h>
+#include <linux/platform_device.h>
+#include <asm/io.h>
+#include <soc/bcm2835/raspberrypi-firmware.h>
+
+#define MAXIMUM_SUPPORTED_POINTS 10
+struct ft5406_regs {
+ uint8_t device_mode;
+ uint8_t gesture_id;
+ uint8_t num_points;
+ struct ft5406_touch {
+ uint8_t xh;
+ uint8_t xl;
+ uint8_t yh;
+ uint8_t yl;
+ uint8_t res1;
+ uint8_t res2;
+ } point[MAXIMUM_SUPPORTED_POINTS];
+};
+
+#define SCREEN_WIDTH 800
+#define SCREEN_HEIGHT 480
+
+struct ft5406 {
+ struct platform_device * pdev;
+ struct input_dev * input_dev;
+ void __iomem * ts_base;
+ struct ft5406_regs * regs;
+ struct task_struct * thread;
+};
+
+/* Thread to poll for touchscreen events
+ *
+ * This thread polls the memory based register copy of the ft5406 registers
+ * using the number of points register to know whether the copy has been
+ * updated (we write 99 to the memory copy, the GPU will write between
+ * 0 - 10 points)
+ */
+static int ft5406_thread(void *arg)
+{
+ struct ft5406 *ts = (struct ft5406 *) arg;
+ struct ft5406_regs regs;
+ int known_ids = 0;
+
+ while(!kthread_should_stop())
+ {
+ // 60fps polling
+ msleep_interruptible(17);
+ memcpy_fromio(&regs, ts->regs, sizeof(*ts->regs));
+ writel(99, &ts->regs->num_points);
+ // Do not output if theres no new information (num_points is 99)
+ // or we have no touch points and don't need to release any
+ if(!(regs.num_points == 99 || (regs.num_points == 0 && known_ids == 0)))
+ {
+ int i;
+ int modified_ids = 0, released_ids;
+ for(i = 0; i < regs.num_points; i++)
+ {
+ int x = (((int) regs.point[i].xh & 0xf) << 8) + regs.point[i].xl;
+ int y = (((int) regs.point[i].yh & 0xf) << 8) + regs.point[i].yl;
+ int touchid = (regs.point[i].yh >> 4) & 0xf;
+
+ modified_ids |= 1 << touchid;
+
+ if(!((1 << touchid) & known_ids))
+ dev_dbg(&ts->pdev->dev, "x = %d, y = %d, touchid = %d\n", x, y, touchid);
+
+ input_mt_slot(ts->input_dev, touchid);
+ input_mt_report_slot_state(ts->input_dev, MT_TOOL_FINGER, 1);
+
+ input_report_abs(ts->input_dev, ABS_MT_POSITION_X, x);
+ input_report_abs(ts->input_dev, ABS_MT_POSITION_Y, y);
+
+ }
+
+ released_ids = known_ids & ~modified_ids;
+ for(i = 0; released_ids && i < MAXIMUM_SUPPORTED_POINTS; i++)
+ {
+ if(released_ids & (1<<i))
+ {
+ dev_dbg(&ts->pdev->dev, "Released %d, known = %x modified = %x\n", i, known_ids, modified_ids);
+ input_mt_slot(ts->input_dev, i);
+ input_mt_report_slot_state(ts->input_dev, MT_TOOL_FINGER, 0);
+ modified_ids &= ~(1 << i);
+ }
+ }
+ known_ids = modified_ids;
+
+ input_mt_report_pointer_emulation(ts->input_dev, true);
+ input_sync(ts->input_dev);
+ }
+
+ }
+
+ return 0;
+}
+
+static int ft5406_probe(struct platform_device *pdev)
+{
+ int ret;
+ struct input_dev * input_dev = input_allocate_device();
+ struct ft5406 * ts;
+ struct device_node *fw_node;
+ struct rpi_firmware *fw;
+ u32 touchbuf;
+
+ dev_info(&pdev->dev, "Probing device\n");
+
+ fw_node = of_parse_phandle(pdev->dev.of_node, "firmware", 0);
+ if (!fw_node) {
+ dev_err(&pdev->dev, "Missing firmware node\n");
+ return -ENOENT;
+ }
+
+ fw = rpi_firmware_get(fw_node);
+ if (!fw)
+ return -EPROBE_DEFER;
+
+ ret = rpi_firmware_property(fw, RPI_FIRMWARE_FRAMEBUFFER_GET_TOUCHBUF,
+ &touchbuf, sizeof(touchbuf));
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to get touch buffer\n");
+ return ret;
+ }
+
+ if (!touchbuf) {
+ dev_err(&pdev->dev, "Touchscreen not detected\n");
+ return -ENODEV;
+ }
+
+ dev_dbg(&pdev->dev, "Got TS buffer 0x%x\n", touchbuf);
+
+ ts = kzalloc(sizeof(struct ft5406), GFP_KERNEL);
+
+ if (!ts || !input_dev) {
+ ret = -ENOMEM;
+ dev_err(&pdev->dev, "Failed to allocate memory\n");
+ return ret;
+ }
+ ts->input_dev = input_dev;
+ platform_set_drvdata(pdev, ts);
+ ts->pdev = pdev;
+
+ input_dev->name = "FT5406 memory based driver";
+
+ __set_bit(EV_KEY, input_dev->evbit);
+ __set_bit(EV_SYN, input_dev->evbit);
+ __set_bit(EV_ABS, input_dev->evbit);
+
+ input_set_abs_params(input_dev, ABS_MT_POSITION_X, 0,
+ SCREEN_WIDTH, 0, 0);
+ input_set_abs_params(input_dev, ABS_MT_POSITION_Y, 0,
+ SCREEN_HEIGHT, 0, 0);
+
+ input_mt_init_slots(input_dev, MAXIMUM_SUPPORTED_POINTS, INPUT_MT_DIRECT);
+
+ input_set_drvdata(input_dev, ts);
+
+ ret = input_register_device(input_dev);
+ if (ret) {
+ dev_err(&pdev->dev, "could not register input device, %d\n",
+ ret);
+ return ret;
+ }
+
+ // mmap the physical memory
+ touchbuf &= ~0xc0000000;
+ ts->ts_base = ioremap(touchbuf, sizeof(*ts->regs));
+ if(ts->ts_base == NULL)
+ {
+ dev_err(&pdev->dev, "Failed to map physical address\n");
+ input_unregister_device(input_dev);
+ kzfree(ts);
+ return -ENOMEM;
+ }
+
+ ts->regs = (struct ft5406_regs *) ts->ts_base;
+
+ // create thread to poll the touch events
+ ts->thread = kthread_run(ft5406_thread, ts, "ft5406");
+ if(ts->thread == NULL)
+ {
+ dev_err(&pdev->dev, "Failed to create kernel thread");
+ iounmap(ts->ts_base);
+ input_unregister_device(input_dev);
+ kzfree(ts);
+ }
+
+ return 0;
+}
+
+static int ft5406_remove(struct platform_device *pdev)
+{
+ struct ft5406 *ts = (struct ft5406 *) platform_get_drvdata(pdev);
+
+ dev_info(&pdev->dev, "Removing rpi-ft5406\n");
+
+ kthread_stop(ts->thread);
+ iounmap(ts->ts_base);
+ input_unregister_device(ts->input_dev);
+ kzfree(ts);
+
+ return 0;
+}
+
+static const struct of_device_id ft5406_match[] = {
+ { .compatible = "rpi,rpi-ft5406", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, ft5406_match);
+
+static struct platform_driver ft5406_driver = {
+ .driver = {
+ .name = "rpi-ft5406",
+ .owner = THIS_MODULE,
+ .of_match_table = ft5406_match,
+ },
+ .probe = ft5406_probe,
+ .remove = ft5406_remove,
+};
+
+module_platform_driver(ft5406_driver);
+
+MODULE_AUTHOR("Gordon Hollingworth");
+MODULE_DESCRIPTION("Touchscreen driver for memory based FT5406");
+MODULE_LICENSE("GPL");
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