+++ /dev/null
-From c513babea26ad936617abdd0b1789f9e67e49847 Mon Sep 17 00:00:00 2001
-From: Gordon Hollingworth <gordon@raspberrypi.org>
-Date: Tue, 12 May 2015 14:47:56 +0100
-Subject: [PATCH 069/222] rpi-ft5406: Add touchscreen driver for pi LCD display
-
----
- drivers/input/touchscreen/Kconfig | 7 +
- drivers/input/touchscreen/Makefile | 1 +
- drivers/input/touchscreen/rpi-ft5406.c | 258 ++++++++++++++++++++++++++
- include/linux/platform_data/mailbox-bcm2708.h | 1 +
- 4 files changed, 267 insertions(+)
- create mode 100644 drivers/input/touchscreen/rpi-ft5406.c
-
---- a/drivers/input/touchscreen/Kconfig
-+++ b/drivers/input/touchscreen/Kconfig
-@@ -583,6 +583,13 @@ 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 ARCH_BCM2708 || ARCH_BCM2709
-+ 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 +1,258 @@
-+/*
-+ * 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 <linux/platform_data/mailbox-bcm2708.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;
-+};
-+
-+
-+/* tag part of the message */
-+struct vc_msg_tag {
-+ uint32_t tag_id; /* the message id */
-+ uint32_t buffer_size; /* size of the buffer (which in this case is always 8 bytes) */
-+ uint32_t data_size; /* amount of data being sent or received */
-+ uint32_t val; /* data buffer */
-+};
-+
-+/* message structure to be sent to videocore */
-+struct vc_msg {
-+ uint32_t msg_size; /* simply, sizeof(struct vc_msg) */
-+ uint32_t request_code; /* holds various information like the success and number of bytes returned (refer to mailboxes wiki) */
-+ struct vc_msg_tag tag; /* the tag structure above to make */
-+ uint32_t end_tag; /* an end identifier, should be set to NULL */
-+};
-+
-+/* 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(17);
-+ memcpy_fromio(®s, 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 vc_msg request;
-+ struct ft5406 * ts;
-+
-+ dev_info(&pdev->dev, "Probing device\n");
-+
-+ 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;
-+ }
-+
-+ memset(&request, 0, sizeof request);
-+
-+ request.msg_size = sizeof request;
-+ request.request_code = VCMSG_PROCESS_REQUEST;
-+ request.tag.tag_id = VCMSG_GET_TOUCHBUF;
-+ request.tag.buffer_size = 4;
-+ request.tag.data_size = 4;
-+
-+ bcm_mailbox_property(&request, sizeof(request));
-+
-+ if(request.request_code == VCMSG_REQUEST_SUCCESSFUL)
-+ {
-+ dev_dbg(&pdev->dev, "Got TS buffer 0x%x\n", request.tag.val);
-+ }
-+ else
-+ {
-+ input_unregister_device(input_dev);
-+ kzfree(ts);
-+ return -1;
-+ }
-+
-+ // mmap the physical memory
-+ request.tag.val &= ~0xc0000000;
-+ ts->ts_base = ioremap(request.tag.val, 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 -1;
-+ }
-+
-+ 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");
---- a/include/linux/platform_data/mailbox-bcm2708.h
-+++ b/include/linux/platform_data/mailbox-bcm2708.h
-@@ -115,6 +115,7 @@ enum {
- VCMSG_SET_TRANSFORM = 0x0004800d,
- VCMSG_TST_VSYNC = 0x0004400e,
- VCMSG_SET_VSYNC = 0x0004800e,
-+ VCMSG_GET_TOUCHBUF = 0x0004000f,
- VCMSG_SET_CURSOR_INFO = 0x00008010,
- VCMSG_SET_CURSOR_STATE = 0x00008011,
- };
projects / openwrt / svn-archive / archive.git / blobdiff