+++ /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