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/touchit213.c | 214 +++++++++++++++++++++++++++++++++ 1 file changed, 214 insertions(+) create mode 100644 drivers/input/touchscreen/touchit213.c (limited to 'drivers/input/touchscreen/touchit213.c') diff --git a/drivers/input/touchscreen/touchit213.c b/drivers/input/touchscreen/touchit213.c new file mode 100644 index 000000000..6d4a1acf5 --- /dev/null +++ b/drivers/input/touchscreen/touchit213.c @@ -0,0 +1,214 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Sahara TouchIT-213 serial touchscreen driver + * + * Copyright (c) 2007-2008 Claudio Nieder + * + * Based on Touchright driver (drivers/input/touchscreen/touchright.c) + * Copyright (c) 2006 Rick Koch + * Copyright (c) 2004 Vojtech Pavlik + * and Dan Streetman + */ + + +#include +#include +#include +#include +#include +#include + +#define DRIVER_DESC "Sahara TouchIT-213 serial touchscreen driver" + +MODULE_AUTHOR("Claudio Nieder "); +MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_LICENSE("GPL"); + +/* + * Definitions & global arrays. + */ + +/* + * Data is received through COM1 at 9600bit/s,8bit,no parity in packets + * of 5 byte each. + * + * +--------+ +--------+ +--------+ +--------+ +--------+ + * |1000000p| |0xxxxxxx| |0xxxxxxx| |0yyyyyyy| |0yyyyyyy| + * +--------+ +--------+ +--------+ +--------+ +--------+ + * MSB LSB MSB LSB + * + * The value of p is 1 as long as the screen is touched and 0 when + * reporting the location where touching stopped, e.g. where the pen was + * lifted from the screen. + * + * When holding the screen in landscape mode as the BIOS text output is + * presented, x is the horizontal axis with values growing from left to + * right and y is the vertical axis with values growing from top to + * bottom. + * + * When holding the screen in portrait mode with the Sahara logo in its + * correct position, x ist the vertical axis with values growing from + * top to bottom and y is the horizontal axis with values growing from + * right to left. + */ + +#define T213_FORMAT_TOUCH_BIT 0x01 +#define T213_FORMAT_STATUS_BYTE 0x80 +#define T213_FORMAT_STATUS_MASK ~T213_FORMAT_TOUCH_BIT + +/* + * On my Sahara Touch-IT 213 I have observed x values from 0 to 0x7f0 + * and y values from 0x1d to 0x7e9, so the actual measurement is + * probably done with an 11 bit precision. + */ +#define T213_MIN_XC 0 +#define T213_MAX_XC 0x07ff +#define T213_MIN_YC 0 +#define T213_MAX_YC 0x07ff + +/* + * Per-touchscreen data. + */ + +struct touchit213 { + struct input_dev *dev; + struct serio *serio; + int idx; + unsigned char csum; + unsigned char data[5]; + char phys[32]; +}; + +static irqreturn_t touchit213_interrupt(struct serio *serio, + unsigned char data, unsigned int flags) +{ + struct touchit213 *touchit213 = serio_get_drvdata(serio); + struct input_dev *dev = touchit213->dev; + + touchit213->data[touchit213->idx] = data; + + switch (touchit213->idx++) { + case 0: + if ((touchit213->data[0] & T213_FORMAT_STATUS_MASK) != + T213_FORMAT_STATUS_BYTE) { + pr_debug("unsynchronized data: 0x%02x\n", data); + touchit213->idx = 0; + } + break; + + case 4: + touchit213->idx = 0; + input_report_abs(dev, ABS_X, + (touchit213->data[1] << 7) | touchit213->data[2]); + input_report_abs(dev, ABS_Y, + (touchit213->data[3] << 7) | touchit213->data[4]); + input_report_key(dev, BTN_TOUCH, + touchit213->data[0] & T213_FORMAT_TOUCH_BIT); + input_sync(dev); + break; + } + + return IRQ_HANDLED; +} + +/* + * touchit213_disconnect() is the opposite of touchit213_connect() + */ + +static void touchit213_disconnect(struct serio *serio) +{ + struct touchit213 *touchit213 = serio_get_drvdata(serio); + + input_get_device(touchit213->dev); + input_unregister_device(touchit213->dev); + serio_close(serio); + serio_set_drvdata(serio, NULL); + input_put_device(touchit213->dev); + kfree(touchit213); +} + +/* + * touchit213_connect() is the routine that is called when someone adds a + * new serio device that supports the Touchright protocol and registers it as + * an input device. + */ + +static int touchit213_connect(struct serio *serio, struct serio_driver *drv) +{ + struct touchit213 *touchit213; + struct input_dev *input_dev; + int err; + + touchit213 = kzalloc_obj(*touchit213); + input_dev = input_allocate_device(); + if (!touchit213 || !input_dev) { + err = -ENOMEM; + goto fail1; + } + + touchit213->serio = serio; + touchit213->dev = input_dev; + scnprintf(touchit213->phys, sizeof(touchit213->phys), + "%s/input0", serio->phys); + + input_dev->name = "Sahara Touch-iT213 Serial TouchScreen"; + input_dev->phys = touchit213->phys; + input_dev->id.bustype = BUS_RS232; + input_dev->id.vendor = SERIO_TOUCHIT213; + input_dev->id.product = 0; + input_dev->id.version = 0x0100; + input_dev->dev.parent = &serio->dev; + input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); + input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); + input_set_abs_params(touchit213->dev, ABS_X, + T213_MIN_XC, T213_MAX_XC, 0, 0); + input_set_abs_params(touchit213->dev, ABS_Y, + T213_MIN_YC, T213_MAX_YC, 0, 0); + + serio_set_drvdata(serio, touchit213); + + err = serio_open(serio, drv); + if (err) + goto fail2; + + err = input_register_device(touchit213->dev); + if (err) + goto fail3; + + return 0; + + fail3: serio_close(serio); + fail2: serio_set_drvdata(serio, NULL); + fail1: input_free_device(input_dev); + kfree(touchit213); + return err; +} + +/* + * The serio driver structure. + */ + +static const struct serio_device_id touchit213_serio_ids[] = { + { + .type = SERIO_RS232, + .proto = SERIO_TOUCHIT213, + .id = SERIO_ANY, + .extra = SERIO_ANY, + }, + { 0 } +}; + +MODULE_DEVICE_TABLE(serio, touchit213_serio_ids); + +static struct serio_driver touchit213_drv = { + .driver = { + .name = "touchit213", + }, + .description = DRIVER_DESC, + .id_table = touchit213_serio_ids, + .interrupt = touchit213_interrupt, + .connect = touchit213_connect, + .disconnect = touchit213_disconnect, +}; + +module_serio_driver(touchit213_drv); -- cgit v1.3.1