Date: Thu, 6 Aug 2020 13:41:42 +0000 (UTC) From: Andriy Gapon <avg@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r363951 - in head/sys: conf dev/usb/misc modules/usb modules/usb/cp2112 Message-ID: <202008061341.076Dfgp8050921@repo.freebsd.org>
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Author: avg Date: Thu Aug 6 13:41:42 2020 New Revision: 363951 URL: https://svnweb.freebsd.org/changeset/base/363951 Log: cp2112: driver for the namesake GPIO and I2C master gadget Documentation: - CP2112 Datasheet https://www.silabs.com/documents/public/data-sheets/cp2112-datasheet.pdf - AN495: CP2112 Interface Specification https://www.silabs.com/documents/public/application-notes/an495-cp2112-interface-specification.pdf - CP2112 Errata https://www.silabs.com/documents/public/errata/cp2112-errata.pdf The logic is implemented as three sub-drivers. The parent driver claims the USB device and creates two child devices. One acts as a GPIO controller and the other is an I2C controller. Tested with CP2112 revision F02. Both features seem to work. HTU21 sensor was used as an I2C slave. Reviewed by: adrian, hselasky MFC after: 2 weeks Relnotes: maybe Differential Revision: https://reviews.freebsd.org/D25359 Added: head/sys/dev/usb/misc/cp2112.c (contents, props changed) head/sys/modules/usb/cp2112/ head/sys/modules/usb/cp2112/Makefile (contents, props changed) Modified: head/sys/conf/files head/sys/modules/usb/Makefile Modified: head/sys/conf/files ============================================================================== --- head/sys/conf/files Thu Aug 6 13:25:04 2020 (r363950) +++ head/sys/conf/files Thu Aug 6 13:41:42 2020 (r363951) @@ -3331,6 +3331,7 @@ dev/usb/serial/usb_serial.c optional ucom | u3g | uar # # USB misc drivers # +dev/usb/misc/cp2112.c optional cp2112 dev/usb/misc/ufm.c optional ufm dev/usb/misc/udbp.c optional udbp dev/usb/misc/ugold.c optional ugold Added: head/sys/dev/usb/misc/cp2112.c ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/sys/dev/usb/misc/cp2112.c Thu Aug 6 13:41:42 2020 (r363951) @@ -0,0 +1,1381 @@ +/*- + * SPDX-License-Identifier: BSD-2-Clause + * + * Copyright (c) Andriy Gapon + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions, and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR + * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + */ + +/* + * Hardware information links: + * - CP2112 Datasheet + * https://www.silabs.com/documents/public/data-sheets/cp2112-datasheet.pdf + * - AN495: CP2112 Interface Specification + * https://www.silabs.com/documents/public/application-notes/an495-cp2112-interface-specification.pdf + * - CP2112 Errata + * https://www.silabs.com/documents/public/errata/cp2112-errata.pdf + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/condvar.h> +#include <sys/bus.h> +#include <sys/gpio.h> +#include <sys/kernel.h> +#include <sys/lock.h> +#include <sys/module.h> +#include <sys/mutex.h> +#include <sys/sdt.h> +#include <sys/sx.h> + +#include <dev/gpio/gpiobusvar.h> + +#include <dev/iicbus/iiconf.h> +#include <dev/iicbus/iicbus.h> +#include "iicbus_if.h" + +#include <dev/usb/usb.h> +#include <dev/usb/usbdi.h> +#include <dev/usb/usbdi_util.h> +#include <dev/usb/usbhid.h> +#include "usbdevs.h" + +#define USB_DEBUG_VAR usb_debug +#include <dev/usb/usb_debug.h> + +#define CP2112GPIO_LOCK(sc) sx_xlock(&sc->gpio_lock) +#define CP2112GPIO_UNLOCK(sc) sx_xunlock(&sc->gpio_lock) +#define CP2112GPIO_LOCKED(sc) sx_assert(&sc->gpio_lock, SX_XLOCKED) + +#define CP2112_PART_NUM 0x0c +#define CP2112_GPIO_COUNT 8 +#define CP2112_REPORT_SIZE 64 + +#define CP2112_REQ_RESET 0x1 +#define CP2112_REQ_GPIO_CFG 0x2 +#define CP2112_REQ_GPIO_GET 0x3 +#define CP2112_REQ_GPIO_SET 0x4 +#define CP2112_REQ_VERSION 0x5 +#define CP2112_REQ_SMB_CFG 0x6 + +#define CP2112_REQ_SMB_READ 0x10 +#define CP2112_REQ_SMB_WRITE_READ 0x11 +#define CP2112_REQ_SMB_READ_FORCE_SEND 0x12 +#define CP2112_REQ_SMB_READ_RESPONSE 0x13 +#define CP2112_REQ_SMB_WRITE 0x14 +#define CP2112_REQ_SMB_XFER_STATUS_REQ 0x15 +#define CP2112_REQ_SMB_XFER_STATUS_RESP 0x16 +#define CP2112_REQ_SMB_CANCEL 0x17 + +#define CP2112_REQ_LOCK 0x20 +#define CP2112_REQ_USB_CFG 0x21 + +#define CP2112_IIC_REPSTART_VER 2 /* Erratum CP2112_E10. */ + +#define CP2112_IIC_STATUS0_IDLE 0 +#define CP2112_IIC_STATUS0_BUSY 1 +#define CP2112_IIC_STATUS0_CMP 2 +#define CP2112_IIC_STATUS0_ERROR 3 + +#define CP2112_IIC_STATUS1_TIMEOUT_NACK 0 +#define CP2112_IIC_STATUS1_TIMEOUT_BUS 1 +#define CP2112_IIC_STATUS1_ARB_LOST 2 + + +struct cp2112_softc { + device_t sc_gpio_dev; + device_t sc_iic_dev; + struct usb_device *sc_udev; + uint8_t sc_iface_index; + uint8_t sc_version; +}; + +struct cp2112gpio_softc { + struct sx gpio_lock; + device_t busdev; + int gpio_caps; + struct gpio_pin pins[CP2112_GPIO_COUNT]; +}; + +static int cp2112_detach(device_t dev); +static int cp2112gpio_detach(device_t dev); +static int cp2112iic_detach(device_t dev); + +static int +cp2112_get_report(device_t dev, uint8_t id, void *data, uint16_t len) +{ + struct cp2112_softc *sc; + int err; + + sc = device_get_softc(dev); + err = usbd_req_get_report(sc->sc_udev, NULL, data, + len, sc->sc_iface_index, UHID_FEATURE_REPORT, id); + return (err); +} + +static int +cp2112_set_report(device_t dev, uint8_t id, void *data, uint16_t len) +{ + struct cp2112_softc *sc; + int err; + + sc = device_get_softc(dev); + err = usbd_req_set_report(sc->sc_udev, NULL, data, + len, sc->sc_iface_index, UHID_FEATURE_REPORT, id); + return (err); +} + +static int +cp2112_gpio_read_pin(device_t dev, uint32_t pin_num, bool *on) +{ + struct { + uint8_t id; + uint8_t state; + } __packed data; + struct cp2112gpio_softc *sc; + int err; + + sc = device_get_softc(dev); + CP2112GPIO_LOCKED(sc); + + data.id = CP2112_REQ_GPIO_GET; + err = cp2112_get_report(device_get_parent(dev), + CP2112_REQ_GPIO_GET, &data, sizeof(data)); + if (err != 0) + return (err); + *on = (data.state & ((uint8_t)1 << pin_num)) != 0; + return (0); + +} + +static int +cp2112_gpio_write_pin(device_t dev, uint32_t pin_num, bool on) +{ + struct { + uint8_t id; + uint8_t state; + uint8_t mask; + } __packed data; + struct cp2112gpio_softc *sc; + int err; + bool actual; + + sc = device_get_softc(dev); + CP2112GPIO_LOCKED(sc); + + data.id = CP2112_REQ_GPIO_SET; + data.state = (uint8_t)on << pin_num; + data.mask = (uint8_t)1 << pin_num; + + err = cp2112_set_report(device_get_parent(dev), + CP2112_REQ_GPIO_SET, &data, sizeof(data)); + if (err != 0) + return (err); + err = cp2112_gpio_read_pin(dev, pin_num, &actual); + if (err != 0) + return (err); + if (actual != on) + return (EIO); + return (0); +} + +static int +cp2112_gpio_configure_write_pin(device_t dev, uint32_t pin_num, + bool output, bool pushpull) +{ + struct { + uint8_t id; + uint8_t output; + uint8_t pushpull; + uint8_t special; + uint8_t divider; + } __packed data; + struct cp2112gpio_softc *sc; + int err; + uint8_t mask; + + sc = device_get_softc(dev); + CP2112GPIO_LOCKED(sc); + + mask = (uint8_t)1 << pin_num; + data.id = CP2112_REQ_GPIO_CFG; + err = cp2112_get_report(device_get_parent(dev), + CP2112_REQ_GPIO_CFG, &data, sizeof(data)); + if (err != 0) + return (err); + if (output) { + data.output |= mask; + if (pushpull) + data.pushpull |= mask; + else + data.pushpull &= ~mask; + } else { + data.output &= ~mask; + data.pushpull &= ~mask; + } + + err = cp2112_set_report(device_get_parent(dev), + CP2112_REQ_GPIO_CFG, &data, sizeof(data)); + if (err != 0) + return (err); + + /* Read back and verify. */ + err = cp2112_get_report(device_get_parent(dev), + CP2112_REQ_GPIO_CFG, &data, sizeof(data)); + if (err != 0) + return (err); + if (((data.output & mask) != 0) != output) + return (EIO); + if (((data.pushpull & mask) != 0) != pushpull) + return (EIO); + return (0); +} + +static device_t +cp2112_gpio_get_bus(device_t dev) +{ + struct cp2112gpio_softc *sc; + + sc = device_get_softc(dev); + return (sc->busdev); +} + +static int +cp2112_gpio_pin_max(device_t dev, int *maxpin) +{ + + *maxpin = CP2112_GPIO_COUNT - 1; + return (0); +} + +static int +cp2112_gpio_pin_set(device_t dev, uint32_t pin_num, uint32_t pin_value) +{ + struct cp2112gpio_softc *sc; + int err; + + if (pin_num >= CP2112_GPIO_COUNT) + return (EINVAL); + + sc = device_get_softc(dev); + CP2112GPIO_LOCK(sc); + err = cp2112_gpio_write_pin(dev, pin_num, pin_value != 0); + CP2112GPIO_UNLOCK(sc); + + return (err); +} + +static int +cp2112_gpio_pin_get(device_t dev, uint32_t pin_num, uint32_t *pin_value) +{ + struct cp2112gpio_softc *sc; + int err; + bool on; + + if (pin_num >= CP2112_GPIO_COUNT) + return (EINVAL); + + sc = device_get_softc(dev); + CP2112GPIO_LOCK(sc); + err = cp2112_gpio_read_pin(dev, pin_num, &on); + CP2112GPIO_UNLOCK(sc); + + if (err == 0) + *pin_value = on; + return (err); +} + +static int +cp2112_gpio_pin_toggle(device_t dev, uint32_t pin_num) +{ + struct cp2112gpio_softc *sc; + int err; + bool on; + + if (pin_num >= CP2112_GPIO_COUNT) + return (EINVAL); + + sc = device_get_softc(dev); + CP2112GPIO_LOCK(sc); + err = cp2112_gpio_read_pin(dev, pin_num, &on); + if (err == 0) + err = cp2112_gpio_write_pin(dev, pin_num, !on); + CP2112GPIO_UNLOCK(sc); + + return (err); +} + +static int +cp2112_gpio_pin_getcaps(device_t dev, uint32_t pin_num, uint32_t *caps) +{ + struct cp2112gpio_softc *sc; + + if (pin_num >= CP2112_GPIO_COUNT) + return (EINVAL); + + sc = device_get_softc(dev); + CP2112GPIO_LOCK(sc); + *caps = sc->gpio_caps; + CP2112GPIO_UNLOCK(sc); + + return (0); +} + +static int +cp2112_gpio_pin_getflags(device_t dev, uint32_t pin_num, uint32_t *flags) +{ + struct cp2112gpio_softc *sc; + + if (pin_num >= CP2112_GPIO_COUNT) + return (EINVAL); + + sc = device_get_softc(dev); + CP2112GPIO_LOCK(sc); + *flags = sc->pins[pin_num].gp_flags; + CP2112GPIO_UNLOCK(sc); + + return (0); +} + +static int +cp2112_gpio_pin_getname(device_t dev, uint32_t pin_num, char *name) +{ + struct cp2112gpio_softc *sc; + + if (pin_num >= CP2112_GPIO_COUNT) + return (EINVAL); + + sc = device_get_softc(dev); + CP2112GPIO_LOCK(sc); + memcpy(name, sc->pins[pin_num].gp_name, GPIOMAXNAME); + CP2112GPIO_UNLOCK(sc); + + return (0); +} + +static int +cp2112_gpio_pin_setflags(device_t dev, uint32_t pin_num, uint32_t flags) +{ + struct cp2112gpio_softc *sc; + struct gpio_pin *pin; + int err; + + if (pin_num >= CP2112_GPIO_COUNT) + return (EINVAL); + + sc = device_get_softc(dev); + if ((flags & sc->gpio_caps) != flags) + return (EINVAL); + + if ((flags & (GPIO_PIN_INPUT | GPIO_PIN_OUTPUT)) == 0) + return (EINVAL); + if ((flags & (GPIO_PIN_INPUT | GPIO_PIN_OUTPUT)) == + (GPIO_PIN_INPUT | GPIO_PIN_OUTPUT)) { + return (EINVAL); + } + if ((flags & GPIO_PIN_INPUT) != 0) { + if ((flags & (GPIO_PIN_OPENDRAIN | GPIO_PIN_PUSHPULL)) != 0) + return (EINVAL); + } else { + if ((flags & (GPIO_PIN_OPENDRAIN | GPIO_PIN_PUSHPULL)) == + (GPIO_PIN_OPENDRAIN | GPIO_PIN_PUSHPULL)) + return (EINVAL); + } + + CP2112GPIO_LOCK(sc); + pin = &sc->pins[pin_num]; + + /* + * If neither push-pull or opendrain is explcitely requested, then + * preserve the current state. + */ + if ((flags & GPIO_PIN_OUTPUT) != 0 && + (flags & (GPIO_PIN_OPENDRAIN | GPIO_PIN_PUSHPULL)) == 0) + flags |= pin->gp_flags & (GPIO_PIN_OPENDRAIN|GPIO_PIN_PUSHPULL); + err = cp2112_gpio_configure_write_pin(dev, pin_num, + (flags & GPIO_PIN_OUTPUT) != 0, + (flags & GPIO_PIN_PUSHPULL) != 0); + if (err == 0) + pin->gp_flags = flags; + CP2112GPIO_UNLOCK(sc); + + return (err); +} + +static const STRUCT_USB_HOST_ID cp2112_devs[] = { + { USB_VP(USB_VENDOR_SILABS, USB_PRODUCT_SILABS_CP2112) }, + { USB_VP(0x1009, USB_PRODUCT_SILABS_CP2112) }, /* XXX */ +}; + +static int +cp2112_probe(device_t dev) +{ + struct usb_attach_arg *uaa; + + uaa = device_get_ivars(dev); + if (uaa->usb_mode != USB_MODE_HOST) + return (ENXIO); + if (uaa->info.bInterfaceClass != UICLASS_HID) + return (ENXIO); + + if (usbd_lookup_id_by_uaa(cp2112_devs, sizeof(cp2112_devs), uaa) == 0) + return (BUS_PROBE_DEFAULT); + return (ENXIO); +} + +static int +cp2112_attach(device_t dev) +{ + struct { + uint8_t id; + uint8_t part_num; + uint8_t version; + } __packed vdata; + struct usb_attach_arg *uaa; + struct cp2112_softc *sc; + int err; + + uaa = device_get_ivars(dev); + sc = device_get_softc(dev); + + device_set_usb_desc(dev); + + sc->sc_udev = uaa->device; + sc->sc_iface_index = uaa->info.bIfaceIndex; + + vdata.id = CP2112_REQ_VERSION; + err = cp2112_get_report(dev, CP2112_REQ_VERSION, &vdata, sizeof(vdata)); + if (err != 0) + goto detach; + device_printf(dev, "part number 0x%02x, version 0x%02x\n", + vdata.part_num, vdata.version); + if (vdata.part_num != CP2112_PART_NUM) { + device_printf(dev, "unsupported part number\n"); + goto detach; + } + sc->sc_version = vdata.version; + sc->sc_gpio_dev = device_add_child(dev, "gpio", -1); + if (sc->sc_gpio_dev != NULL) { + err = device_probe_and_attach(sc->sc_gpio_dev); + if (err != 0) { + device_printf(dev, "failed to attach gpio child\n"); + } + } else { + device_printf(dev, "failed to create gpio child\n"); + } + + sc->sc_iic_dev = device_add_child(dev, "iichb", -1); + if (sc->sc_iic_dev != NULL) { + err = device_probe_and_attach(sc->sc_iic_dev); + if (err != 0) { + device_printf(dev, "failed to attach iic child\n"); + } + } else { + device_printf(dev, "failed to create iic child\n"); + } + + return (0); + +detach: + cp2112_detach(dev); + return (ENXIO); +} + +static int +cp2112_detach(device_t dev) +{ + int err; + + err = bus_generic_detach(dev); + if (err != 0) + return (err); + device_delete_children(dev); + return (0); +} + +static int +cp2112gpio_probe(device_t dev) +{ + device_set_desc(dev, "CP2112 GPIO interface"); + return (BUS_PROBE_SPECIFIC); +} + +static int +cp2112gpio_attach(device_t dev) +{ + struct { + uint8_t id; + uint8_t output; + uint8_t pushpull; + uint8_t special; + uint8_t divider; + } __packed data; + struct cp2112gpio_softc *sc; + device_t cp2112; + int err; + int i; + uint8_t mask; + + cp2112 = device_get_parent(dev); + sc = device_get_softc(dev); + sx_init(&sc->gpio_lock, "cp2112 lock"); + + sc->gpio_caps = GPIO_PIN_INPUT | GPIO_PIN_OUTPUT | GPIO_PIN_OPENDRAIN | + GPIO_PIN_PUSHPULL; + + data.id = CP2112_REQ_GPIO_CFG; + err = cp2112_get_report(cp2112, CP2112_REQ_GPIO_CFG, + &data, sizeof(data)); + if (err != 0) + goto detach; + + for (i = 0; i < CP2112_GPIO_COUNT; i++) { + struct gpio_pin *pin; + + mask = (uint8_t)1 << i; + pin = &sc->pins[i]; + pin->gp_flags = 0; + + snprintf(pin->gp_name, GPIOMAXNAME, "GPIO%u", i); + pin->gp_name[GPIOMAXNAME - 1] = '\0'; + + if ((data.output & mask) != 0) { + pin->gp_flags |= GPIO_PIN_OUTPUT; + if ((data.pushpull & mask) != 0) + pin->gp_flags |= GPIO_PIN_PUSHPULL; + else + pin->gp_flags |= GPIO_PIN_OPENDRAIN; + } else { + pin->gp_flags |= GPIO_PIN_INPUT; + } + } + + sc->busdev = gpiobus_attach_bus(dev); + if (sc->busdev == NULL) { + device_printf(dev, "gpiobus_attach_bus failed\n"); + goto detach; + } + return (0); + +detach: + cp2112gpio_detach(dev); + return (ENXIO); +} + +static int +cp2112gpio_detach(device_t dev) +{ + struct cp2112gpio_softc *sc; + + sc = device_get_softc(dev); + if (sc->busdev != NULL) + gpiobus_detach_bus(dev); + sx_destroy(&sc->gpio_lock); + return (0); +} + +static device_method_t cp2112hid_methods[] = { + DEVMETHOD(device_probe, cp2112_probe), + DEVMETHOD(device_attach, cp2112_attach), + DEVMETHOD(device_detach, cp2112_detach), + + DEVMETHOD_END +}; + +static device_method_t cp2112gpio_methods[] = { + /* Device */ + DEVMETHOD(device_probe, cp2112gpio_probe), + DEVMETHOD(device_attach, cp2112gpio_attach), + DEVMETHOD(device_detach, cp2112gpio_detach), + + /* GPIO */ + DEVMETHOD(gpio_get_bus, cp2112_gpio_get_bus), + DEVMETHOD(gpio_pin_max, cp2112_gpio_pin_max), + DEVMETHOD(gpio_pin_get, cp2112_gpio_pin_get), + DEVMETHOD(gpio_pin_set, cp2112_gpio_pin_set), + DEVMETHOD(gpio_pin_toggle, cp2112_gpio_pin_toggle), + DEVMETHOD(gpio_pin_getname, cp2112_gpio_pin_getname), + DEVMETHOD(gpio_pin_getcaps, cp2112_gpio_pin_getcaps), + DEVMETHOD(gpio_pin_getflags, cp2112_gpio_pin_getflags), + DEVMETHOD(gpio_pin_setflags, cp2112_gpio_pin_setflags), + + DEVMETHOD_END +}; + +static driver_t cp2112hid_driver = { + .name = "cp2112hid", + .methods = cp2112hid_methods, + .size = sizeof(struct cp2112_softc), +}; + +static devclass_t cp2112hid_devclass; +DRIVER_MODULE(cp2112hid, uhub, cp2112hid_driver, cp2112hid_devclass, + NULL, NULL); +MODULE_DEPEND(cp2112hid, usb, 1, 1, 1); +MODULE_VERSION(cp2112hid, 1); +USB_PNP_HOST_INFO(cp2112_devs); + +static driver_t cp2112gpio_driver = { + .name = "gpio", + .methods = cp2112gpio_methods, + .size = sizeof(struct cp2112gpio_softc), +}; + +static devclass_t cp2112gpio_devclass; +DRIVER_MODULE(cp2112gpio, cp2112hid, cp2112gpio_driver, cp2112gpio_devclass, + NULL, NULL); +MODULE_DEPEND(cp2112gpio, cp2112hid, 1, 1, 1); +MODULE_DEPEND(cp2112gpio, gpiobus, 1, 1, 1); +MODULE_VERSION(cp2112gpio, 1); + + + +/* CP2112 I2C driver code. */ + + +enum { + CP2112_INTR_OUT = 0, + CP2112_INTR_IN, + CP2112_N_TRANSFER, +}; + +struct cp2112iic_softc { + device_t dev; + device_t iicbus_dev; + struct usb_xfer *xfers[CP2112_N_TRANSFER]; + u_char own_addr; + struct { + struct mtx lock; + struct cv cv; + struct { + uint8_t *data; + int len; + int done; + int error; + } in; + struct { + const uint8_t *data; + int len; + int done; + int error; + } out; + } io; +}; + +static void +cp2112iic_intr_write_callback(struct usb_xfer *xfer, usb_error_t error) +{ + struct cp2112iic_softc *sc; + struct cp2112_softc *psc; + struct usb_page_cache *pc; + + sc = usbd_xfer_softc(xfer); + psc = device_get_softc(device_get_parent(sc->dev)); + + mtx_assert(&sc->io.lock, MA_OWNED); + + switch (USB_GET_STATE(xfer)) { + case USB_ST_SETUP: + pc = usbd_xfer_get_frame(xfer, 0); + usbd_copy_in(pc, 0, sc->io.out.data, sc->io.out.len); + usbd_xfer_set_frame_len(xfer, 0, sc->io.out.len); + usbd_xfer_set_frames(xfer, 1); + usbd_transfer_submit(xfer); + break; + case USB_ST_TRANSFERRED: + sc->io.out.error = 0; + sc->io.out.done = 1; + cv_signal(&sc->io.cv); + break; + default: /* Error */ + device_printf(sc->dev, "write intr state %d error %d\n", + USB_GET_STATE(xfer), error); + sc->io.out.error = IIC_EBUSERR; + cv_signal(&sc->io.cv); + if (error != USB_ERR_CANCELLED) { + /* try to clear stall first */ + usbd_xfer_set_stall(xfer); + } + break; + } +} + +static void +cp2112iic_intr_read_callback(struct usb_xfer *xfer, usb_error_t error) +{ + struct cp2112iic_softc *sc = usbd_xfer_softc(xfer); + struct usb_page_cache *pc; + int act_len, len; + + mtx_assert(&sc->io.lock, MA_OWNED); + usbd_xfer_status(xfer, &act_len, NULL, NULL, NULL); + + switch (USB_GET_STATE(xfer)) { + case USB_ST_TRANSFERRED: + if (sc->io.in.done) { + device_printf(sc->dev, + "interrupt while previous is pending, ignored\n"); + } else if (sc->io.in.len == 0) { + uint8_t buf[8]; + + /* + * There is a spurious Transfer Status Response and + * zero-length Read Response during hardware + * configuration. Possibly they carry some information + * about the initial bus state. + */ + if (device_is_attached(sc->dev)) { + device_printf(sc->dev, + "unsolicited interrupt, ignored\n"); + if (bootverbose) { + pc = usbd_xfer_get_frame(xfer, 0); + len = MIN(sizeof(buf), act_len); + usbd_copy_out(pc, 0, buf, len); + device_printf(sc->dev, "data: %*D\n", + len, buf, " "); + } + } else { + pc = usbd_xfer_get_frame(xfer, 0); + len = MIN(sizeof(buf), act_len); + usbd_copy_out(pc, 0, buf, len); + if (buf[0] == CP2112_REQ_SMB_XFER_STATUS_RESP) { + device_printf(sc->dev, + "initial bus status0 = 0x%02x, " + "status1 = 0x%02x\n", + buf[1], buf[2]); + } + } + } else if (act_len == CP2112_REPORT_SIZE) { + pc = usbd_xfer_get_frame(xfer, 0); + usbd_copy_out(pc, 0, sc->io.in.data, sc->io.in.len); + sc->io.in.error = 0; + sc->io.in.done = 1; + } else { + device_printf(sc->dev, + "unexpected input report length %u\n", act_len); + sc->io.in.error = IIC_EBUSERR; + sc->io.in.done = 1; + } + cv_signal(&sc->io.cv); + case USB_ST_SETUP: +tr_setup: + usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_len(xfer)); + usbd_transfer_submit(xfer); + break; + + default: /* Error */ + device_printf(sc->dev, "read intr state %d error %d\n", + USB_GET_STATE(xfer), error); + + sc->io.in.error = IIC_EBUSERR; + sc->io.in.done = 1; + cv_signal(&sc->io.cv); + if (error != USB_ERR_CANCELLED) { + /* try to clear stall first */ + usbd_xfer_set_stall(xfer); + goto tr_setup; + } + break; + } +} + +static const struct usb_config cp2112iic_config[CP2112_N_TRANSFER] = { + [CP2112_INTR_OUT] = { + .type = UE_INTERRUPT, + .endpoint = UE_ADDR_ANY, + .direction = UE_DIR_OUT, + .flags = { .pipe_bof = 1, .no_pipe_ok = 1, }, + .bufsize = 0, /* use wMaxPacketSize */ + .callback = &cp2112iic_intr_write_callback, + }, + [CP2112_INTR_IN] = { + .type = UE_INTERRUPT, + .endpoint = UE_ADDR_ANY, + .direction = UE_DIR_IN, + .flags = { .pipe_bof = 1, .short_xfer_ok = 1, }, + .bufsize = 0, /* use wMaxPacketSize */ + .callback = &cp2112iic_intr_read_callback, + }, +}; + +static int +cp2112iic_send_req(struct cp2112iic_softc *sc, const void *data, + uint16_t len) +{ + int err; + + mtx_assert(&sc->io.lock, MA_OWNED); + KASSERT(sc->io.out.done == 0, ("%s: conflicting request", __func__)); + + sc->io.out.data = data; + sc->io.out.len = len; + + DTRACE_PROBE1(send__req, uint8_t, *(const uint8_t *)data); + + usbd_transfer_start(sc->xfers[CP2112_INTR_OUT]); + + while (!sc->io.out.done) + cv_wait(&sc->io.cv, &sc->io.lock); + + usbd_transfer_stop(sc->xfers[CP2112_INTR_OUT]); + + sc->io.out.done = 0; + sc->io.out.data = NULL; + sc->io.out.len = 0; + err = sc->io.out.error; + if (err != 0) { + device_printf(sc->dev, "output report 0x%02x failed: %d\n", + *(const uint8_t*)data, err); + } + return (err); +} + +static int +cp2112iic_req_resp(struct cp2112iic_softc *sc, const void *req_data, + uint16_t req_len, void *resp_data, uint16_t resp_len) +{ + int err; + + mtx_assert(&sc->io.lock, MA_OWNED); + + /* + * Prepare to receive a response interrupt even before the + * request transfer is confirmed (USB_ST_TRANSFERED). + */ + KASSERT(sc->io.in.done == 0, ("%s: conflicting request", __func__)); + sc->io.in.len = resp_len; + sc->io.in.data = resp_data; + + err = cp2112iic_send_req(sc, req_data, req_len); + if (err != 0) { + sc->io.in.len = 0; + sc->io.in.data = NULL; + return (err); + } + + while (!sc->io.in.done) + cv_wait(&sc->io.cv, &sc->io.lock); + + err = sc->io.in.error; + sc->io.in.done = 0; + sc->io.in.error = 0; + sc->io.in.len = 0; + sc->io.in.data = NULL; + return (err); +} + +static int +cp2112iic_check_req_status(struct cp2112iic_softc *sc) +{ + struct { + uint8_t id; + uint8_t request; + } __packed xfer_status_req; + struct { + uint8_t id; + uint8_t status0; + uint8_t status1; + uint16_t status2; + uint16_t status3; + } __packed xfer_status_resp; + int err; + + mtx_assert(&sc->io.lock, MA_OWNED); + + do { + xfer_status_req.id = CP2112_REQ_SMB_XFER_STATUS_REQ; + xfer_status_req.request = 1; + err = cp2112iic_req_resp(sc, + &xfer_status_req, sizeof(xfer_status_req), + &xfer_status_resp, sizeof(xfer_status_resp)); + + if (xfer_status_resp.id != CP2112_REQ_SMB_XFER_STATUS_RESP) { + device_printf(sc->dev, + "unexpected response 0x%02x to status request\n", + xfer_status_resp.id); + err = IIC_EBUSERR; + goto out; + } + + DTRACE_PROBE4(xfer__status, uint8_t, xfer_status_resp.status0, + uint8_t, xfer_status_resp.status1, + uint16_t, be16toh(xfer_status_resp.status2), + uint16_t, be16toh(xfer_status_resp.status3)); + + switch (xfer_status_resp.status0) { + case CP2112_IIC_STATUS0_IDLE: + err = IIC_ESTATUS; + break; + case CP2112_IIC_STATUS0_BUSY: + err = ERESTART; /* non-I2C, special handling */ + break; + case CP2112_IIC_STATUS0_CMP: + err = IIC_NOERR; + break; + case CP2112_IIC_STATUS0_ERROR: + switch (xfer_status_resp.status1) { + case CP2112_IIC_STATUS1_TIMEOUT_NACK: + err = IIC_ENOACK; + break; + case CP2112_IIC_STATUS1_TIMEOUT_BUS: + err = IIC_ETIMEOUT; + break; + case CP2112_IIC_STATUS1_ARB_LOST: + err = IIC_EBUSBSY; + break; + default: + device_printf(sc->dev, + "i2c error, status = 0x%02x\n", + xfer_status_resp.status1); + err = IIC_ESTATUS; + break; + } + break; + default: + device_printf(sc->dev, + "unknown i2c xfer status0 0x%02x\n", + xfer_status_resp.status0); + err = IIC_EBUSERR; + break; + } + + } while (err == ERESTART); +out: + return (err); +} + +static int +cp2112iic_read_data(struct cp2112iic_softc *sc, void *data, uint16_t in_len, + uint16_t *out_len) +{ + struct { + uint8_t id; + uint16_t length; + } __packed data_read_force_send; + struct { + uint8_t id; + uint8_t status; + uint8_t length; + uint8_t data[61]; + } __packed data_read_resp; + int err; + + mtx_assert(&sc->io.lock, MA_OWNED); + *** DIFF OUTPUT TRUNCATED AT 1000 LINES ***
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