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4295485719
openwrt/target/linux/brcm2708/patches-4.19/950-0105-Tidy-up-of-the-ft5406-driver-to-use-DT-2189.patch
Álvaro Fernández Rojas 4295485719 brcm2708: add linux 4.19 support 
Boot tested on Raspberry Pi B+ (BCM2708) and Raspberry Pi 2 (BCM2709)

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
2019-07-14 12:44:14 +02:00

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From c391ccaadd8928a79986e67ebc23cd6670b83d85 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 105/703] 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appropriately; there is a newer version of the VC4 side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(&regs, 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;
}
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