--- /dev/null
+From 67acc12c996ef55038206de9e4220e69bf8dd517 Mon Sep 17 00:00:00 2001
+From: James Hughes <JamesH65@users.noreply.github.com>
+Date: Thu, 16 Nov 2017 15:56:17 +0000
+Subject: [PATCH] Tidy up of the ft5406 driver to use DT (#2189)
+
+Driver was using a fixed resolution, this commit
+adds touchscreen size, and coordinate flip and swap
+features via device tree overlays.
+
+Adds overrides so the VC4 can adjust the DT parameters
+appropriately; there is a newer version of the VC4 side
+driver that can now set up the appropriate DT values
+if required.
+
+Signed-off-by: James Hughes <james.hughes@raspberrypi.org>
+---
+ drivers/input/touchscreen/rpi-ft5406.c | 218 ++++++++++++++++---------
+ 1 file changed, 145 insertions(+), 73 deletions(-)
+
+--- a/drivers/input/touchscreen/rpi-ft5406.c
++++ b/drivers/input/touchscreen/rpi-ft5406.c
+@@ -1,7 +1,7 @@
+ /*
+ * Driver for memory based ft5406 touchscreen
+ *
+- * Copyright (C) 2015 Raspberry Pi
++ * Copyright (C) 2015, 2017 Raspberry Pi
+ *
+ *
+ * This program is free software; you can redistribute it and/or modify
+@@ -9,7 +9,6 @@
+ * published by the Free Software Foundation.
+ */
+
+-
+ #include <linux/module.h>
+ #include <linux/interrupt.h>
+ #include <linux/input.h>
+@@ -21,11 +20,15 @@
+ #include <linux/kthread.h>
+ #include <linux/platform_device.h>
+ #include <linux/stddef.h>
+-#include <asm/io.h>
++#include <linux/io.h>
+ #include <linux/dma-mapping.h>
+ #include <soc/bcm2835/raspberrypi-firmware.h>
+
+ #define MAXIMUM_SUPPORTED_POINTS 10
++#define FTS_TOUCH_DOWN 0
++#define FTS_TOUCH_UP 1
++#define FTS_TOUCH_CONTACT 2
++
+ struct ft5406_regs {
+ uint8_t device_mode;
+ uint8_t gesture_id;
+@@ -35,85 +38,125 @@ struct ft5406_regs {
+ uint8_t xl;
+ uint8_t yh;
+ uint8_t yl;
+- uint8_t res1;
+- uint8_t res2;
++ uint8_t pressure; /* Not supported */
++ uint8_t area; /* Not supported */
+ } point[MAXIMUM_SUPPORTED_POINTS];
+ };
+
+-#define SCREEN_WIDTH 800
+-#define SCREEN_HEIGHT 480
++/* These are defaults if the DT entries are missing */
++#define DEFAULT_SCREEN_WIDTH 800
++#define DEFAULT_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;
++ struct platform_device *pdev;
++ struct input_dev *input_dev;
++ void __iomem *ts_base;
++ dma_addr_t bus_addr;
++ struct task_struct *thread;
++
++ uint16_t max_x;
++ uint16_t max_y;
++ uint8_t hflip;
++ uint8_t vflip;
++ uint8_t xyswap;
+ };
+
+ /* 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
++ * updated (we write 99 to the memory copy, the GPU will write between
+ * 0 - 10 points)
+ */
++#define ID_TO_BIT(a) (1 << a)
++
+ 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
++
++ 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)))
+- {
++ 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);
++ 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;
++ int event_type = (regs.point[i].xh >> 6) & 0x03;
+
+- input_report_abs(ts->input_dev, ABS_MT_POSITION_X, x);
+- input_report_abs(ts->input_dev, ABS_MT_POSITION_Y, y);
++ modified_ids |= ID_TO_BIT(touchid);
+
++ if (event_type == FTS_TOUCH_DOWN ||
++ event_type == FTS_TOUCH_CONTACT) {
++ if (ts->hflip)
++ x = ts->max_x - 1 - x;
++
++ if (ts->vflip)
++ y = ts->max_y - 1 - y;
++
++ if (ts->xyswap)
++ swap(x, y);
++
++ if (!((ID_TO_BIT(touchid)) & known_ids))
++ dev_dbg(&ts->pdev->dev,
++ "x = %d, y = %d, press = %d, touchid = %d\n",
++ x, y,
++ regs.point[i].pressure,
++ 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);
++ 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);
++ input_mt_report_slot_state(
++ ts->input_dev,
++ MT_TOOL_FINGER,
++ 0);
++ modified_ids &= ~(ID_TO_BIT(i));
+ }
+ }
+ known_ids = modified_ids;
+-
++
+ input_mt_report_pointer_emulation(ts->input_dev, true);
+ input_sync(ts->input_dev);
+ }
+-
+ }
+-
++
+ return 0;
+ }
+
+@@ -122,13 +165,14 @@ static int ft5406_probe(struct platform_
+ int err = 0;
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
+- struct ft5406 * ts;
++ struct ft5406 *ts;
+ struct device_node *fw_node;
+ struct rpi_firmware *fw;
+ u32 touchbuf;
+-
++ u32 val;
++
+ dev_info(dev, "Probing device\n");
+-
++
+ fw_node = of_parse_phandle(np, "firmware", 0);
+ if (!fw_node) {
+ dev_err(dev, "Missing firmware node\n");
+@@ -151,7 +195,8 @@ static int ft5406_probe(struct platform_
+ return -ENOMEM;
+ }
+
+- ts->ts_base = dma_zalloc_coherent(dev, PAGE_SIZE, &ts->bus_addr, GFP_KERNEL);
++ 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);
+@@ -164,17 +209,22 @@ static int ft5406_probe(struct platform_
+ &touchbuf, sizeof(touchbuf));
+
+ if (err || touchbuf != 0) {
+- dev_warn(dev, "Failed to set touchbuf, trying to get err:%x\n", err);
++ 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));
++ 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;
+@@ -188,11 +238,10 @@ static int ft5406_probe(struct platform_
+
+ dev_dbg(dev, "Got TS buffer 0x%x\n", touchbuf);
+
+- // mmap the physical memory
++ /* mmap the physical memory */
+ touchbuf &= ~0xc0000000;
+ ts->ts_base = ioremap(touchbuf, sizeof(struct ft5406_regs));
+- if (ts->ts_base == NULL)
+- {
++ if (ts->ts_base == NULL) {
+ dev_err(dev, "Failed to map physical address\n");
+ err = -ENOMEM;
+ goto out;
+@@ -200,22 +249,46 @@ static int ft5406_probe(struct platform_
+ }
+ platform_set_drvdata(pdev, ts);
+ ts->pdev = pdev;
+-
++
+ ts->input_dev->name = "FT5406 memory based driver";
+-
++
++ if (of_property_read_u32(np, "touchscreen-size-x", &val) >= 0)
++ ts->max_x = val;
++ else
++ ts->max_x = DEFAULT_SCREEN_WIDTH;
++
++ if (of_property_read_u32(np, "touchscreen-size-y", &val) >= 0)
++ ts->max_y = val;
++ else
++ ts->max_y = DEFAULT_SCREEN_HEIGHT;
++
++ if (of_property_read_u32(np, "touchscreen-inverted-x", &val) >= 0)
++ ts->hflip = val;
++
++ if (of_property_read_u32(np, "touchscreen-inverted-y", &val) >= 0)
++ ts->vflip = val;
++
++ if (of_property_read_u32(np, "touchscreen-swapped-x-y", &val) >= 0)
++ ts->xyswap = val;
++
++ dev_dbg(dev,
++ "Touchscreen parameters (%d,%d), hflip=%d, vflip=%d, xyswap=%d",
++ ts->max_x, ts->max_y, ts->hflip, ts->vflip, ts->xyswap);
++
+ __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);
++ ts->xyswap ? ts->max_y : ts->max_x, 0, 0);
+ input_set_abs_params(ts->input_dev, ABS_MT_POSITION_Y, 0,
+- SCREEN_HEIGHT, 0, 0);
++ ts->xyswap ? ts->max_x : ts->max_y, 0, 0);
+
+- input_mt_init_slots(ts->input_dev, MAXIMUM_SUPPORTED_POINTS, INPUT_MT_DIRECT);
++ 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",
+@@ -223,10 +296,9 @@ static int ft5406_probe(struct platform_
+ goto out;
+ }
+
+- // create thread to poll the touch events
++ /* create thread that polls the touch events */
+ ts->thread = kthread_run(ft5406_thread, ts, "ft5406");
+- if(ts->thread == NULL)
+- {
++ if (ts->thread == NULL) {
+ dev_err(dev, "Failed to create kernel thread");
+ err = -ENOMEM;
+ goto out;
+@@ -254,9 +326,9 @@ static int ft5406_remove(struct platform
+ {
+ 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)
+@@ -265,7 +337,7 @@ static int ft5406_remove(struct platform
+ iounmap(ts->ts_base);
+ if (ts->input_dev)
+ input_unregister_device(ts->input_dev);
+-
++
+ return 0;
+ }
+
projects / openwrt / staging / chunkeey.git / blobdiff