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/mtouch.c | 200 +++++++++++++++++++++++++++++++++++++ 1 file changed, 200 insertions(+) create mode 100644 drivers/input/touchscreen/mtouch.c (limited to 'drivers/input/touchscreen/mtouch.c') diff --git a/drivers/input/touchscreen/mtouch.c b/drivers/input/touchscreen/mtouch.c new file mode 100644 index 000000000..cc2d206d2 --- /dev/null +++ b/drivers/input/touchscreen/mtouch.c @@ -0,0 +1,200 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * MicroTouch (3M) serial touchscreen driver + * + * Copyright (c) 2004 Vojtech Pavlik + */ + + +/* + * 2005/02/19 Dan Streetman + * Copied elo.c and edited for MicroTouch protocol + */ + +#include +#include +#include +#include +#include +#include + +#define DRIVER_DESC "MicroTouch serial touchscreen driver" + +MODULE_AUTHOR("Vojtech Pavlik "); +MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_LICENSE("GPL"); + +/* + * Definitions & global arrays. + */ + +#define MTOUCH_FORMAT_TABLET_STATUS_BIT 0x80 +#define MTOUCH_FORMAT_TABLET_TOUCH_BIT 0x40 +#define MTOUCH_FORMAT_TABLET_LENGTH 5 +#define MTOUCH_RESPONSE_BEGIN_BYTE 0x01 +#define MTOUCH_RESPONSE_END_BYTE 0x0d + +/* todo: check specs for max length of all responses */ +#define MTOUCH_MAX_LENGTH 16 + +#define MTOUCH_MIN_XC 0 +#define MTOUCH_MAX_XC 0x3fff +#define MTOUCH_MIN_YC 0 +#define MTOUCH_MAX_YC 0x3fff + +#define MTOUCH_GET_XC(data) (((data[2])<<7) | data[1]) +#define MTOUCH_GET_YC(data) (((data[4])<<7) | data[3]) +#define MTOUCH_GET_TOUCHED(data) (MTOUCH_FORMAT_TABLET_TOUCH_BIT & data[0]) + +/* + * Per-touchscreen data. + */ + +struct mtouch { + struct input_dev *dev; + struct serio *serio; + int idx; + unsigned char data[MTOUCH_MAX_LENGTH]; + char phys[32]; +}; + +static void mtouch_process_format_tablet(struct mtouch *mtouch) +{ + struct input_dev *dev = mtouch->dev; + + if (MTOUCH_FORMAT_TABLET_LENGTH == ++mtouch->idx) { + input_report_abs(dev, ABS_X, MTOUCH_GET_XC(mtouch->data)); + input_report_abs(dev, ABS_Y, MTOUCH_MAX_YC - MTOUCH_GET_YC(mtouch->data)); + input_report_key(dev, BTN_TOUCH, MTOUCH_GET_TOUCHED(mtouch->data)); + input_sync(dev); + + mtouch->idx = 0; + } +} + +static void mtouch_process_response(struct mtouch *mtouch) +{ + if (MTOUCH_RESPONSE_END_BYTE == mtouch->data[mtouch->idx++]) { + /* FIXME - process response */ + mtouch->idx = 0; + } else if (MTOUCH_MAX_LENGTH == mtouch->idx) { + printk(KERN_ERR "mtouch.c: too many response bytes\n"); + mtouch->idx = 0; + } +} + +static irqreturn_t mtouch_interrupt(struct serio *serio, + unsigned char data, unsigned int flags) +{ + struct mtouch *mtouch = serio_get_drvdata(serio); + + mtouch->data[mtouch->idx] = data; + + if (MTOUCH_FORMAT_TABLET_STATUS_BIT & mtouch->data[0]) + mtouch_process_format_tablet(mtouch); + else if (MTOUCH_RESPONSE_BEGIN_BYTE == mtouch->data[0]) + mtouch_process_response(mtouch); + else + printk(KERN_DEBUG "mtouch.c: unknown/unsynchronized data from device, byte %x\n",mtouch->data[0]); + + return IRQ_HANDLED; +} + +/* + * mtouch_disconnect() is the opposite of mtouch_connect() + */ + +static void mtouch_disconnect(struct serio *serio) +{ + struct mtouch *mtouch = serio_get_drvdata(serio); + + input_get_device(mtouch->dev); + input_unregister_device(mtouch->dev); + serio_close(serio); + serio_set_drvdata(serio, NULL); + input_put_device(mtouch->dev); + kfree(mtouch); +} + +/* + * mtouch_connect() is the routine that is called when someone adds a + * new serio device that supports MicroTouch (Format Tablet) protocol and registers it as + * an input device. + */ + +static int mtouch_connect(struct serio *serio, struct serio_driver *drv) +{ + struct mtouch *mtouch; + struct input_dev *input_dev; + int err; + + mtouch = kzalloc_obj(*mtouch); + input_dev = input_allocate_device(); + if (!mtouch || !input_dev) { + err = -ENOMEM; + goto fail1; + } + + mtouch->serio = serio; + mtouch->dev = input_dev; + scnprintf(mtouch->phys, sizeof(mtouch->phys), "%s/input0", serio->phys); + + input_dev->name = "MicroTouch Serial TouchScreen"; + input_dev->phys = mtouch->phys; + input_dev->id.bustype = BUS_RS232; + input_dev->id.vendor = SERIO_MICROTOUCH; + 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(mtouch->dev, ABS_X, MTOUCH_MIN_XC, MTOUCH_MAX_XC, 0, 0); + input_set_abs_params(mtouch->dev, ABS_Y, MTOUCH_MIN_YC, MTOUCH_MAX_YC, 0, 0); + + serio_set_drvdata(serio, mtouch); + + err = serio_open(serio, drv); + if (err) + goto fail2; + + err = input_register_device(mtouch->dev); + if (err) + goto fail3; + + return 0; + + fail3: serio_close(serio); + fail2: serio_set_drvdata(serio, NULL); + fail1: input_free_device(input_dev); + kfree(mtouch); + return err; +} + +/* + * The serio driver structure. + */ + +static const struct serio_device_id mtouch_serio_ids[] = { + { + .type = SERIO_RS232, + .proto = SERIO_MICROTOUCH, + .id = SERIO_ANY, + .extra = SERIO_ANY, + }, + { 0 } +}; + +MODULE_DEVICE_TABLE(serio, mtouch_serio_ids); + +static struct serio_driver mtouch_drv = { + .driver = { + .name = "mtouch", + }, + .description = DRIVER_DESC, + .id_table = mtouch_serio_ids, + .interrupt = mtouch_interrupt, + .connect = mtouch_connect, + .disconnect = mtouch_disconnect, +}; + +module_serio_driver(mtouch_drv); -- cgit v1.3.1