From 4352b8aee98005853aa63f57d6377282de17a33f Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sun, 23 Aug 2026 13:28:57 -0700 Subject: Merge tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux Pull I3C updates from Alexandre Belloni: "A new driver this cycle, for the AMD AXI I3C controller. There are also new features such as IBI wakeup support, SETAASA device discovery and ACPI support for the the DAA methods, meaning we can now communicate with the SPD devices on DDR5 modules. New driver: - AMD AXI I3C master controller Subsystem: - I3C Common Command Code (CCC) handling improvements, especially around GET CCCs - SETAASA device discovery support - ACPI support for all existing DAA methods like SETDASA, SETNEWDA as well as I2C devices on I3C bus - IBI-based wakeup support Drivers: - dw: SETAASA support - mipi-i3c-hci: advertise IBI wakeup capability, AMD_PT I3C controller support, PIO queue management support for HCI v1.2 - renesas: improve suspend to RAM support, add runtime PM support" * tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux: (70 commits) i3c: dw: reduce do_daa time if there's no client i3c: mipi-i3c-hci: Add support for AMD_PT I3C controller i3c: mipi-i3c-hci: Add PIO queue management support for HCI v1.2 i3c: mipi-i3c-hci: Fix missing STAT_IBI_STATUS_THLD in PIO mode i3c: dw: rename "pclk" to "apb" to match dt-binding i3c: dw: make struct dw_i3c_cmd smaller i3c: dw: use COMMAND_PORT_TRANSFER_ARG instead of hardcoding i3c: renesas: Don't register devices when ENTDAA times out i3c: master: dw-i3c-master: fix OD timing for first broadcast i3c: mipi-i3c-hci: Advertise IBI wakeup capability i3c: mipi-i3c-hci: Factor out i3c_hci_sysdev() i3c: mipi-i3c-hci-pci: Propagate I3C wakeup requirements to PCI i3c: master: Reject IBI requests from non-IBI-capable devices i3c: master: Add helper to query bus wakeup requirements i3c: master: Report wakeup events for IBIs i3c: master: Support IBI-based wakeup capability i3c: master: Fix potential UAF in i3c_device_match() i3c: master: Fix potential UAF in i3c_device_uevent() i3c: Make dev->desc locking assumptions explicit i3c: master: Fix use-after-free of master->this ... --- drivers/input/touchscreen/raspberrypi-ts.c | 226 +++++++++++++++++++++++++++++ 1 file changed, 226 insertions(+) create mode 100644 drivers/input/touchscreen/raspberrypi-ts.c (limited to 'drivers/input/touchscreen/raspberrypi-ts.c') diff --git a/drivers/input/touchscreen/raspberrypi-ts.c b/drivers/input/touchscreen/raspberrypi-ts.c new file mode 100644 index 000000000..841d39a44 --- /dev/null +++ b/drivers/input/touchscreen/raspberrypi-ts.c @@ -0,0 +1,226 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Raspberry Pi firmware based touchscreen driver + * + * Copyright (C) 2015, 2017 Raspberry Pi + * Copyright (C) 2018 Nicolas Saenz Julienne + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#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_dev *input; + 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_dev *input) +{ + struct rpi_ts *ts = input_get_drvdata(input); + struct rpi_ts_regs regs; + int modified_ids = 0; + long released_ids; + int event_type; + int touchid; + int x, y; + int i; + + memcpy_fromio(®s, 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_inactive(input); + 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_dev *input; + struct rpi_firmware *fw; + struct rpi_ts *ts; + u32 touchbuf; + int error; + + struct device_node *fw_node __free(device_node) = of_get_parent(np); + if (!fw_node) { + dev_err(dev, "Missing firmware node\n"); + return -ENOENT; + } + + fw = devm_rpi_firmware_get(&pdev->dev, 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_alloc_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; + } + + input = devm_input_allocate_device(dev); + if (!input) { + dev_err(dev, "Failed to allocate input device\n"); + return -ENOMEM; + } + + ts->input = input; + input_set_drvdata(input, ts); + + input->name = "raspberrypi-ts"; + input->id.bustype = BUS_HOST; + + 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_setup_polling(input, rpi_ts_poll); + if (error) { + dev_err(dev, "could not set up polling mode, %d\n", error); + return error; + } + + input_set_poll_interval(input, RPI_TS_POLL_INTERVAL); + + error = input_register_device(input); + 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 "); +MODULE_DESCRIPTION("Raspberry Pi firmware based touchscreen driver"); +MODULE_LICENSE("GPL v2"); -- cgit v1.3.1