--- /dev/null
+From 8137201823bd2ed1b3951220f29fdc9555c3c6de Mon Sep 17 00:00:00 2001
+From: Gordon Hollingworth <gordon@raspberrypi.org>
+Date: Tue, 12 May 2015 14:47:56 +0100
+Subject: [PATCH] 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
+
+RPI-FT5406: Enable aarch64 support through explicit iomem interface
+
+Signed-off-by: Gerhard de Clercq <gerharddeclercq@outlook.com>
+---
+ drivers/input/touchscreen/Kconfig | 7 +
+ drivers/input/touchscreen/Makefile | 1 +
+ drivers/input/touchscreen/rpi-ft5406.c | 292 +++++++++++++++++++++++++
+ 3 files changed, 300 insertions(+)
+ create mode 100644 drivers/input/touchscreen/rpi-ft5406.c
+
+--- a/drivers/input/touchscreen/Kconfig
++++ b/drivers/input/touchscreen/Kconfig
+@@ -696,6 +696,13 @@ 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 || COMPILE_TEST) && I2C
+--- a/drivers/input/touchscreen/Makefile
++++ b/drivers/input/touchscreen/Makefile
+@@ -33,6 +33,7 @@ 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 +1,292 @@
++/*
++ * 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 <linux/stddef.h>
++#include <asm/io.h>
++#include <linux/dma-mapping.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;
++ dma_addr_t bus_addr;
++ 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(®s, ts->ts_base, sizeof(struct ft5406_regs));
++ iowrite8(99, ts->ts_base + offsetof(struct ft5406_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 err = 0;
++ struct device *dev = &pdev->dev;
++ struct device_node *np = dev->of_node;
++ struct ft5406 * ts;
++ struct device_node *fw_node;
++ struct rpi_firmware *fw;
++ u32 touchbuf;
++
++ dev_info(dev, "Probing device\n");
++
++ fw_node = of_parse_phandle(np, "firmware", 0);
++ if (!fw_node) {
++ dev_err(dev, "Missing firmware node\n");
++ return -ENOENT;
++ }
++
++ fw = rpi_firmware_get(fw_node);
++ if (!fw)
++ return -EPROBE_DEFER;
++
++ ts = devm_kzalloc(dev, sizeof(struct ft5406), GFP_KERNEL);
++ if (!ts) {
++ dev_err(dev, "Failed to allocate memory\n");
++ return -ENOMEM;
++ }
++
++ ts->input_dev = input_allocate_device();
++ if (!ts->input_dev) {
++ dev_err(dev, "Failed to allocate input device\n");
++ return -ENOMEM;
++ }
++
++ ts->ts_base = dma_zalloc_coherent(dev, PAGE_SIZE, &ts->bus_addr, GFP_KERNEL);
++ if (!ts->ts_base) {
++ pr_err("[%s]: failed to dma_alloc_coherent(%ld)\n",
++ __func__, PAGE_SIZE);
++ err = -ENOMEM;
++ goto out;
++ }
++
++ touchbuf = (u32)ts->bus_addr;
++ err = rpi_firmware_property(fw, RPI_FIRMWARE_FRAMEBUFFER_SET_TOUCHBUF,
++ &touchbuf, sizeof(touchbuf));
++
++ if (err || touchbuf != 0) {
++ dev_warn(dev, "Failed to set touchbuf, trying to get err:%x\n", err);
++ dma_free_coherent(dev, PAGE_SIZE, ts->ts_base, ts->bus_addr);
++ ts->ts_base = 0;
++ ts->bus_addr = 0;
++ }
++
++ if (!ts->ts_base) {
++ dev_warn(dev, "set failed, trying get (err:%d touchbuf:%x virt:%p bus:%x)\n", err, touchbuf, ts->ts_base, ts->bus_addr);
++
++ err = rpi_firmware_property(fw, RPI_FIRMWARE_FRAMEBUFFER_GET_TOUCHBUF,
++ &touchbuf, sizeof(touchbuf));
++ if (err) {
++ dev_err(dev, "Failed to get touch buffer\n");
++ goto out;
++ }
++
++ if (!touchbuf) {
++ dev_err(dev, "Touchscreen not detected\n");
++ err = -ENODEV;
++ goto out;
++ }
++
++ dev_dbg(dev, "Got TS buffer 0x%x\n", touchbuf);
++
++ // mmap the physical memory
++ touchbuf &= ~0xc0000000;
++ ts->ts_base = ioremap(touchbuf, sizeof(struct ft5406_regs));
++ if (ts->ts_base == NULL)
++ {
++ dev_err(dev, "Failed to map physical address\n");
++ err = -ENOMEM;
++ goto out;
++ }
++ }
++ platform_set_drvdata(pdev, ts);
++ ts->pdev = pdev;
++
++ ts->input_dev->name = "FT5406 memory based driver";
++
++ __set_bit(EV_KEY, ts->input_dev->evbit);
++ __set_bit(EV_SYN, ts->input_dev->evbit);
++ __set_bit(EV_ABS, ts->input_dev->evbit);
++
++ input_set_abs_params(ts->input_dev, ABS_MT_POSITION_X, 0,
++ SCREEN_WIDTH, 0, 0);
++ input_set_abs_params(ts->input_dev, ABS_MT_POSITION_Y, 0,
++ SCREEN_HEIGHT, 0, 0);
++
++ input_mt_init_slots(ts->input_dev, MAXIMUM_SUPPORTED_POINTS, INPUT_MT_DIRECT);
++
++ input_set_drvdata(ts->input_dev, ts);
++
++ err = input_register_device(ts->input_dev);
++ if (err) {
++ dev_err(dev, "could not register input device, %d\n",
++ err);
++ goto out;
++ }
++
++ // create thread to poll the touch events
++ ts->thread = kthread_run(ft5406_thread, ts, "ft5406");
++ if(ts->thread == NULL)
++ {
++ dev_err(dev, "Failed to create kernel thread");
++ err = -ENOMEM;
++ goto out;
++ }
++
++ return 0;
++
++out:
++ if (ts->bus_addr) {
++ dma_free_coherent(dev, PAGE_SIZE, ts->ts_base, ts->bus_addr);
++ ts->bus_addr = 0;
++ ts->ts_base = NULL;
++ } else if (ts->ts_base) {
++ iounmap(ts->ts_base);
++ ts->ts_base = NULL;
++ }
++ if (ts->input_dev) {
++ input_unregister_device(ts->input_dev);
++ ts->input_dev = NULL;
++ }
++ return err;
++}
++
++static int ft5406_remove(struct platform_device *pdev)
++{
++ struct device *dev = &pdev->dev;
++ struct ft5406 *ts = (struct ft5406 *) platform_get_drvdata(pdev);
++
++ dev_info(dev, "Removing rpi-ft5406\n");
++
++ kthread_stop(ts->thread);
++
++ if (ts->bus_addr)
++ dma_free_coherent(dev, PAGE_SIZE, ts->ts_base, ts->bus_addr);
++ else if (ts->ts_base)
++ iounmap(ts->ts_base);
++ if (ts->input_dev)
++ input_unregister_device(ts->input_dev);
++
++ 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");
projects / openwrt / openwrt.git / blobdiff