228 lines
5.7 KiB
C
228 lines
5.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Raspberry Pi firmware based touchscreen driver
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*
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* Copyright (C) 2015, 2017 Raspberry Pi
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* Copyright (C) 2018 Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
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*/
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#include <linux/io.h>
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#include <linux/of.h>
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#include <linux/slab.h>
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/bitops.h>
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#include <linux/dma-mapping.h>
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#include <linux/platform_device.h>
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#include <linux/input.h>
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#include <linux/input/mt.h>
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#include <linux/input-polldev.h>
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#include <linux/input/touchscreen.h>
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#include <soc/bcm2835/raspberrypi-firmware.h>
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#define RPI_TS_DEFAULT_WIDTH 800
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#define RPI_TS_DEFAULT_HEIGHT 480
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#define RPI_TS_MAX_SUPPORTED_POINTS 10
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#define RPI_TS_FTS_TOUCH_DOWN 0
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#define RPI_TS_FTS_TOUCH_CONTACT 2
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#define RPI_TS_POLL_INTERVAL 17 /* 60fps */
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#define RPI_TS_NPOINTS_REG_INVALIDATE 99
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struct rpi_ts {
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struct platform_device *pdev;
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struct input_polled_dev *poll_dev;
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struct touchscreen_properties prop;
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void __iomem *fw_regs_va;
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dma_addr_t fw_regs_phys;
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int known_ids;
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};
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struct rpi_ts_regs {
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u8 device_mode;
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u8 gesture_id;
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u8 num_points;
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struct rpi_ts_touch {
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u8 xh;
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u8 xl;
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u8 yh;
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u8 yl;
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u8 pressure; /* Not supported */
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u8 area; /* Not supported */
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} point[RPI_TS_MAX_SUPPORTED_POINTS];
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};
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static void rpi_ts_poll(struct input_polled_dev *dev)
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{
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struct input_dev *input = dev->input;
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struct rpi_ts *ts = dev->private;
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struct rpi_ts_regs regs;
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int modified_ids = 0;
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long released_ids;
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int event_type;
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int touchid;
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int x, y;
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int i;
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memcpy_fromio(®s, ts->fw_regs_va, sizeof(regs));
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/*
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* We poll the memory based register copy of the touchscreen chip using
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* the number of points register to know whether the copy has been
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* updated (we write 99 to the memory copy, the GPU will write between
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* 0 - 10 points)
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*/
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iowrite8(RPI_TS_NPOINTS_REG_INVALIDATE,
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ts->fw_regs_va + offsetof(struct rpi_ts_regs, num_points));
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if (regs.num_points == RPI_TS_NPOINTS_REG_INVALIDATE ||
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(regs.num_points == 0 && ts->known_ids == 0))
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return;
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for (i = 0; i < regs.num_points; i++) {
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x = (((int)regs.point[i].xh & 0xf) << 8) + regs.point[i].xl;
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y = (((int)regs.point[i].yh & 0xf) << 8) + regs.point[i].yl;
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touchid = (regs.point[i].yh >> 4) & 0xf;
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event_type = (regs.point[i].xh >> 6) & 0x03;
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modified_ids |= BIT(touchid);
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if (event_type == RPI_TS_FTS_TOUCH_DOWN ||
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event_type == RPI_TS_FTS_TOUCH_CONTACT) {
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input_mt_slot(input, touchid);
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input_mt_report_slot_state(input, MT_TOOL_FINGER, 1);
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touchscreen_report_pos(input, &ts->prop, x, y, true);
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}
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}
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released_ids = ts->known_ids & ~modified_ids;
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for_each_set_bit(i, &released_ids, RPI_TS_MAX_SUPPORTED_POINTS) {
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input_mt_slot(input, i);
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input_mt_report_slot_state(input, MT_TOOL_FINGER, 0);
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modified_ids &= ~(BIT(i));
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}
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ts->known_ids = modified_ids;
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input_mt_sync_frame(input);
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input_sync(input);
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}
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static void rpi_ts_dma_cleanup(void *data)
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{
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struct rpi_ts *ts = data;
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struct device *dev = &ts->pdev->dev;
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dma_free_coherent(dev, PAGE_SIZE, ts->fw_regs_va, ts->fw_regs_phys);
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}
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static int rpi_ts_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct device_node *np = dev->of_node;
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struct input_polled_dev *poll_dev;
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struct device_node *fw_node;
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struct rpi_firmware *fw;
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struct input_dev *input;
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struct rpi_ts *ts;
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u32 touchbuf;
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int error;
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fw_node = of_get_parent(np);
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if (!fw_node) {
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dev_err(dev, "Missing firmware node\n");
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return -ENOENT;
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}
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fw = rpi_firmware_get(fw_node);
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of_node_put(fw_node);
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if (!fw)
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return -EPROBE_DEFER;
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ts = devm_kzalloc(dev, sizeof(*ts), GFP_KERNEL);
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if (!ts)
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return -ENOMEM;
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ts->pdev = pdev;
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ts->fw_regs_va = dma_zalloc_coherent(dev, PAGE_SIZE, &ts->fw_regs_phys,
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GFP_KERNEL);
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if (!ts->fw_regs_va) {
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dev_err(dev, "failed to dma_alloc_coherent\n");
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return -ENOMEM;
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}
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error = devm_add_action_or_reset(dev, rpi_ts_dma_cleanup, ts);
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if (error) {
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dev_err(dev, "failed to devm_add_action_or_reset, %d\n", error);
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return error;
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}
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touchbuf = (u32)ts->fw_regs_phys;
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error = rpi_firmware_property(fw, RPI_FIRMWARE_FRAMEBUFFER_SET_TOUCHBUF,
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&touchbuf, sizeof(touchbuf));
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if (error || touchbuf != 0) {
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dev_warn(dev, "Failed to set touchbuf, %d\n", error);
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return error;
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}
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poll_dev = devm_input_allocate_polled_device(dev);
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if (!poll_dev) {
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dev_err(dev, "Failed to allocate input device\n");
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return -ENOMEM;
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}
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ts->poll_dev = poll_dev;
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input = poll_dev->input;
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input->name = "raspberrypi-ts";
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input->id.bustype = BUS_HOST;
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poll_dev->poll_interval = RPI_TS_POLL_INTERVAL;
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poll_dev->poll = rpi_ts_poll;
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poll_dev->private = ts;
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input_set_abs_params(input, ABS_MT_POSITION_X, 0,
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RPI_TS_DEFAULT_WIDTH, 0, 0);
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input_set_abs_params(input, ABS_MT_POSITION_Y, 0,
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RPI_TS_DEFAULT_HEIGHT, 0, 0);
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touchscreen_parse_properties(input, true, &ts->prop);
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error = input_mt_init_slots(input, RPI_TS_MAX_SUPPORTED_POINTS,
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INPUT_MT_DIRECT);
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if (error) {
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dev_err(dev, "could not init mt slots, %d\n", error);
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return error;
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}
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error = input_register_polled_device(poll_dev);
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if (error) {
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dev_err(dev, "could not register input device, %d\n", error);
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return error;
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}
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return 0;
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}
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static const struct of_device_id rpi_ts_match[] = {
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{ .compatible = "raspberrypi,firmware-ts", },
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{},
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};
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MODULE_DEVICE_TABLE(of, rpi_ts_match);
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static struct platform_driver rpi_ts_driver = {
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.driver = {
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.name = "raspberrypi-ts",
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.of_match_table = rpi_ts_match,
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},
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.probe = rpi_ts_probe,
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};
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module_platform_driver(rpi_ts_driver);
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MODULE_AUTHOR("Gordon Hollingworth");
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MODULE_AUTHOR("Nicolas Saenz Julienne <nsaenzjulienne@suse.de>");
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MODULE_DESCRIPTION("Raspberry Pi firmware based touchscreen driver");
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MODULE_LICENSE("GPL v2");
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