From 1c0f57f0ad2d226ec0d1ef1e91a38c3abdee891a Mon Sep 17 00:00:00 2001 From: Gordon Hollingworth 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 --- 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#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(®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<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");