Input: add official Raspberry Pi's touchscreen driver (0b9f28fe) · Commits · e / devices / android_kernel_fairphone_FP5

Documentation/devicetree/bindings/input/touchscreen/raspberrypi,firmware-ts.txt

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		Raspberry Pi firmware based 7" touchscreen
		=====================================

		Required properties:
		- compatible: "raspberrypi,firmware-ts"

		Optional properties:
		- firmware: Reference to RPi's firmware device node
		- touchscreen-size-x: See touchscreen.txt
		- touchscreen-size-y: See touchscreen.txt
		- touchscreen-inverted-x: See touchscreen.txt
		- touchscreen-inverted-y: See touchscreen.txt
		- touchscreen-swapped-x-y: See touchscreen.txt

		Example:

		firmware: firmware-rpi {
		compatible = "raspberrypi,bcm2835-firmware";
		mboxes = <&mailbox>;

		ts: touchscreen {
		compatible = "raspberrypi,firmware-ts";
		touchscreen-size-x = <800>;
		touchscreen-size-y = <480>;
		};
		};

drivers/input/touchscreen/Kconfig

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		@@ -683,6 +683,18 @@ config TOUCHSCREEN_EDT_FT5X06
		To compile this driver as a module, choose M here: the
		module will be called edt-ft5x06.

		config TOUCHSCREEN_RASPBERRYPI_FW
		tristate "Raspberry Pi's firmware base touch screen support"
		depends on RASPBERRYPI_FIRMWARE \|\| COMPILE_TEST
		help
		Say Y here if you have the official Raspberry Pi 7 inch screen on
		your system.

		If unsure, say N.

		To compile this driver as a module, choose M here: the
		module will be called raspberrypi-ts.

		config TOUCHSCREEN_MIGOR
		tristate "Renesas MIGO-R touchscreen"
		depends on (SH_MIGOR \|\| COMPILE_TEST) && I2C

drivers/input/touchscreen/Makefile

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		@@ -108,3 +108,4 @@ obj-$(CONFIG_TOUCHSCREEN_ZET6223) += zet6223.o
		obj-$(CONFIG_TOUCHSCREEN_ZFORCE) += zforce_ts.o
		obj-$(CONFIG_TOUCHSCREEN_COLIBRI_VF50) += colibri-vf50-ts.o
		obj-$(CONFIG_TOUCHSCREEN_ROHM_BU21023) += rohm_bu21023.o
		obj-$(CONFIG_TOUCHSCREEN_RASPBERRYPI_FW) += raspberrypi-ts.o

drivers/input/touchscreen/raspberrypi-ts.c

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		// SPDX-License-Identifier: GPL-2.0
		/*
		* Raspberry Pi firmware based touchscreen driver
		*
		* Copyright (C) 2015, 2017 Raspberry Pi
		* Copyright (C) 2018 Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
		*/

		#include <linux/io.h>
		#include <linux/of.h>
		#include <linux/slab.h>
		#include <linux/device.h>
		#include <linux/module.h>
		#include <linux/bitops.h>
		#include <linux/dma-mapping.h>
		#include <linux/platform_device.h>
		#include <linux/input.h>
		#include <linux/input/mt.h>
		#include <linux/input-polldev.h>
		#include <linux/input/touchscreen.h>
		#include <soc/bcm2835/raspberrypi-firmware.h>

		#define RPI_TS_DEFAULT_WIDTH 800
		#define RPI_TS_DEFAULT_HEIGHT 480

		#define RPI_TS_MAX_SUPPORTED_POINTS 10

		#define RPI_TS_FTS_TOUCH_DOWN 0
		#define RPI_TS_FTS_TOUCH_CONTACT 2

		#define RPI_TS_POLL_INTERVAL 17 /* 60fps */

		#define RPI_TS_NPOINTS_REG_INVALIDATE 99

		struct rpi_ts {
		struct platform_device *pdev;
		struct input_polled_dev *poll_dev;
		struct touchscreen_properties prop;

		void __iomem *fw_regs_va;
		dma_addr_t fw_regs_phys;

		int known_ids;
		};

		struct rpi_ts_regs {
		u8 device_mode;
		u8 gesture_id;
		u8 num_points;
		struct rpi_ts_touch {
		u8 xh;
		u8 xl;
		u8 yh;
		u8 yl;
		u8 pressure; /* Not supported */
		u8 area; /* Not supported */
		} point[RPI_TS_MAX_SUPPORTED_POINTS];
		};

		static void rpi_ts_poll(struct input_polled_dev *dev)
		{
		struct input_dev *input = dev->input;
		struct rpi_ts *ts = dev->private;
		struct rpi_ts_regs regs;
		int modified_ids = 0;
		long released_ids;
		int event_type;
		int touchid;
		int x, y;
		int i;

		memcpy_fromio(&regs, ts->fw_regs_va, sizeof(regs));
		/*
		* We poll the memory based register copy of the touchscreen chip 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)
		*/
		iowrite8(RPI_TS_NPOINTS_REG_INVALIDATE,
		ts->fw_regs_va + offsetof(struct rpi_ts_regs, num_points));

		if (regs.num_points == RPI_TS_NPOINTS_REG_INVALIDATE \|\|
		(regs.num_points == 0 && ts->known_ids == 0))
		return;

		for (i = 0; i < regs.num_points; i++) {
		x = (((int)regs.point[i].xh & 0xf) << 8) + regs.point[i].xl;
		y = (((int)regs.point[i].yh & 0xf) << 8) + regs.point[i].yl;
		touchid = (regs.point[i].yh >> 4) & 0xf;
		event_type = (regs.point[i].xh >> 6) & 0x03;

		modified_ids \|= BIT(touchid);

		if (event_type == RPI_TS_FTS_TOUCH_DOWN \|\|
		event_type == RPI_TS_FTS_TOUCH_CONTACT) {
		input_mt_slot(input, touchid);
		input_mt_report_slot_state(input, MT_TOOL_FINGER, 1);
		touchscreen_report_pos(input, &ts->prop, x, y, true);
		}
		}

		released_ids = ts->known_ids & ~modified_ids;
		for_each_set_bit(i, &released_ids, RPI_TS_MAX_SUPPORTED_POINTS) {
		input_mt_slot(input, i);
		input_mt_report_slot_state(input, MT_TOOL_FINGER, 0);
		modified_ids &= ~(BIT(i));
		}
		ts->known_ids = modified_ids;

		input_mt_sync_frame(input);
		input_sync(input);
		}

		static void rpi_ts_dma_cleanup(void *data)
		{
		struct rpi_ts *ts = data;
		struct device *dev = &ts->pdev->dev;

		dma_free_coherent(dev, PAGE_SIZE, ts->fw_regs_va, ts->fw_regs_phys);
		}

		static int rpi_ts_probe(struct platform_device *pdev)
		{
		struct device *dev = &pdev->dev;
		struct device_node *np = dev->of_node;
		struct input_polled_dev *poll_dev;
		struct device_node *fw_node;
		struct rpi_firmware *fw;
		struct input_dev *input;
		struct rpi_ts *ts;
		u32 touchbuf;
		int error;

		fw_node = of_get_parent(np);
		if (!fw_node) {
		dev_err(dev, "Missing firmware node\n");
		return -ENOENT;
		}

		fw = rpi_firmware_get(fw_node);
		of_node_put(fw_node);
		if (!fw)
		return -EPROBE_DEFER;

		ts = devm_kzalloc(dev, sizeof(*ts), GFP_KERNEL);
		if (!ts)
		return -ENOMEM;
		ts->pdev = pdev;

		ts->fw_regs_va = dma_zalloc_coherent(dev, PAGE_SIZE, &ts->fw_regs_phys,
		GFP_KERNEL);
		if (!ts->fw_regs_va) {
		dev_err(dev, "failed to dma_alloc_coherent\n");
		return -ENOMEM;
		}

		error = devm_add_action_or_reset(dev, rpi_ts_dma_cleanup, ts);
		if (error) {
		dev_err(dev, "failed to devm_add_action_or_reset, %d\n", error);
		return error;
		}


		touchbuf = (u32)ts->fw_regs_phys;
		error = rpi_firmware_property(fw, RPI_FIRMWARE_FRAMEBUFFER_SET_TOUCHBUF,
		&touchbuf, sizeof(touchbuf));

		if (error \|\| touchbuf != 0) {
		dev_warn(dev, "Failed to set touchbuf, %d\n", error);
		return error;
		}

		poll_dev = devm_input_allocate_polled_device(dev);
		if (!poll_dev) {
		dev_err(dev, "Failed to allocate input device\n");
		return -ENOMEM;
		}
		ts->poll_dev = poll_dev;
		input = poll_dev->input;

		input->name = "raspberrypi-ts";
		input->id.bustype = BUS_HOST;
		poll_dev->poll_interval = RPI_TS_POLL_INTERVAL;
		poll_dev->poll = rpi_ts_poll;
		poll_dev->private = ts;

		input_set_abs_params(input, ABS_MT_POSITION_X, 0,
		RPI_TS_DEFAULT_WIDTH, 0, 0);
		input_set_abs_params(input, ABS_MT_POSITION_Y, 0,
		RPI_TS_DEFAULT_HEIGHT, 0, 0);
		touchscreen_parse_properties(input, true, &ts->prop);

		error = input_mt_init_slots(input, RPI_TS_MAX_SUPPORTED_POINTS,
		INPUT_MT_DIRECT);
		if (error) {
		dev_err(dev, "could not init mt slots, %d\n", error);
		return error;
		}

		error = input_register_polled_device(poll_dev);
		if (error) {
		dev_err(dev, "could not register input device, %d\n", error);
		return error;
		}

		return 0;
		}

		static const struct of_device_id rpi_ts_match[] = {
		{ .compatible = "raspberrypi,firmware-ts", },
		{},
		};
		MODULE_DEVICE_TABLE(of, rpi_ts_match);

		static struct platform_driver rpi_ts_driver = {
		.driver = {
		.name = "raspberrypi-ts",
		.of_match_table = rpi_ts_match,
		},
		.probe = rpi_ts_probe,
		};
		module_platform_driver(rpi_ts_driver);

		MODULE_AUTHOR("Gordon Hollingworth");
		MODULE_AUTHOR("Nicolas Saenz Julienne <nsaenzjulienne@suse.de>");
		MODULE_DESCRIPTION("Raspberry Pi firmware based touchscreen driver");
		MODULE_LICENSE("GPL v2");