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229 lines
5.6 KiB
229 lines
5.6 KiB
// 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 <[email protected]> |
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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/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_dev *input; |
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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_dev *input) |
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{ |
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struct rpi_ts *ts = input_get_drvdata(input); |
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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_inactive(input); |
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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_dev *input; |
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struct device_node *fw_node; |
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struct rpi_firmware *fw; |
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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_alloc_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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input = devm_input_allocate_device(dev); |
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if (!input) { |
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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->input = input; |
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input_set_drvdata(input, ts); |
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input->name = "raspberrypi-ts"; |
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input->id.bustype = BUS_HOST; |
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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_setup_polling(input, rpi_ts_poll); |
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if (error) { |
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dev_err(dev, "could not set up polling mode, %d\n", error); |
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return error; |
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} |
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input_set_poll_interval(input, RPI_TS_POLL_INTERVAL); |
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error = input_register_device(input); |
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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 <[email protected]>"); |
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MODULE_DESCRIPTION("Raspberry Pi firmware based touchscreen driver"); |
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MODULE_LICENSE("GPL v2");
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