brcm2708: update to latest version

As usual these patches were extracted from the raspberry pi repo:
https://github.com/raspberrypi/linux/commits/rpi-4.4.y

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

1 files changed, 290 insertions, 0 deletions

diff --git a/target/linux/brcm2708/patches-4.4/0078-rpi-ft5406-Add-touchscreen-driver-for-pi-LCD-display.patch b/target/linux/brcm2708/patches-4.4/0078-rpi-ft5406-Add-touchscreen-driver-for-pi-LCD-display.patch
new file mode 100644
index 0000000..9a1445d
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.4/0078-rpi-ft5406-Add-touchscreen-driver-for-pi-LCD-display.patch
@@ -0,0 +1,290 @@
+From d46fbf49354f8c82cc216d56d9addad113703c50 Mon Sep 17 00:00:00 2001
+From: Gordon Hollingworth <gordon@raspberrypi.org>
+Date: Tue, 12 May 2015 14:47:56 +0100
+Subject: [PATCH 078/232] 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");