| Message ID | 20220616013747.126051-2-frank@zago.net |
|---|---|
| State | New |
| Headers | show |
| Series | add driver for the WCH CH341 in I2C/GPIO mode | expand |
USB review please. > The CH341 is a multifunction chip, presenting 3 different USB PID. One > > of these functions is for I2C/SPI/GPIO. This new set of drivers will > manage I2C and GPIO. > > Signed-off-by: frank zago <frank@zago.net> > --- > MAINTAINERS | 7 +++ > drivers/mfd/Kconfig | 10 +++++ > drivers/mfd/Makefile | 1 + > drivers/mfd/ch341-core.c | 90 +++++++++++++++++++++++++++++++++++++++ > include/linux/mfd/ch341.h | 18 ++++++++ > 5 files changed, 126 insertions(+) > create mode 100644 drivers/mfd/ch341-core.c > create mode 100644 include/linux/mfd/ch341.h > > diff --git a/MAINTAINERS b/MAINTAINERS > index 43d3d07afccd..628eeaa9bf68 100644 > --- a/MAINTAINERS > +++ b/MAINTAINERS > @@ -21475,6 +21475,13 @@ M: David Härdeman <david@hardeman.nu> > S: Maintained > F: drivers/media/rc/winbond-cir.c > > +WINCHIPHEAD CH341 I2C/GPIO MFD DRIVER > +M: Frank Zago <frank@zago.net> > +L: linux-usb@vger.kernel.org > +S: Maintained > +F: drivers/mfd/ch341-core.c > +F: include/linux/mfd/ch341.h > + > WINSYSTEMS EBC-C384 WATCHDOG DRIVER > M: William Breathitt Gray <vilhelm.gray@gmail.com> > L: linux-watchdog@vger.kernel.org > diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig > index 3b59456f5545..893acc821a42 100644 > --- a/drivers/mfd/Kconfig > +++ b/drivers/mfd/Kconfig > @@ -1784,6 +1784,16 @@ config MFD_LOCHNAGAR > help > Support for Cirrus Logic Lochnagar audio development board. > > +config MFD_CH341 > + tristate "WinChipHead CH341 in I2C/SPI/GPIO mode" > + depends on USB > + help > + If you say yes to this option, support for the CH341 series > + of chips, running in I2C/SPI/GPIO mode will be included. > + > + This driver can also be built as a module. If so, the > + module will be called ch341-core. > + > config MFD_ARIZONA > select REGMAP > select REGMAP_IRQ > diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile > index 858cacf659d6..fd615ab3929f 100644 > --- a/drivers/mfd/Makefile > +++ b/drivers/mfd/Makefile > @@ -13,6 +13,7 @@ obj-$(CONFIG_MFD_ASIC3) += asic3.o tmio_core.o > obj-$(CONFIG_ARCH_BCM2835) += bcm2835-pm.o > obj-$(CONFIG_MFD_BCM590XX) += bcm590xx.o > obj-$(CONFIG_MFD_BD9571MWV) += bd9571mwv.o > +obj-$(CONFIG_MFD_CH341) += ch341-core.o > obj-$(CONFIG_MFD_CROS_EC_DEV) += cros_ec_dev.o > obj-$(CONFIG_MFD_ENE_KB3930) += ene-kb3930.o > obj-$(CONFIG_MFD_EXYNOS_LPASS) += exynos-lpass.o > diff --git a/drivers/mfd/ch341-core.c b/drivers/mfd/ch341-core.c > new file mode 100644 > index 000000000000..f08a67dd6074 > --- /dev/null > +++ b/drivers/mfd/ch341-core.c > @@ -0,0 +1,90 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * Core driver for the CH341A, CH341B and CH341T in I2C/SPI/GPIO > + * mode. There are cell drivers available for I2C and GPIO. SPI is not > + * yet supported. > + * > + * Copyright 2022, Frank Zago > + * Copyright (c) 2017 Gunar Schorcht (gunar@schorcht.net) > + * Copyright (c) 2016 Tse Lun Bien > + * Copyright (c) 2014 Marco Gittler > + * Copyright (c) 2006-2007 Till Harbaum (Till@Harbaum.org) > + */ > + > +#include <linux/kernel.h> > +#include <linux/mfd/ch341.h> > +#include <linux/mfd/core.h> > +#include <linux/module.h> > +#include <linux/slab.h> > +#include <linux/usb.h> > + > +static const struct mfd_cell ch341_devs[] = { > + { > + .name = "ch341-gpio", > + }, > + { > + .name = "ch341-i2c", > + }, > +}; > + > +static int ch341_usb_probe(struct usb_interface *iface, > + const struct usb_device_id *usb_id) > +{ > + struct usb_endpoint_descriptor *bulk_out; > + struct usb_endpoint_descriptor *bulk_in; > + struct usb_endpoint_descriptor *intr_in; > + struct ch341_ddata *ddata; > + int ret; > + > + ddata = devm_kzalloc(&iface->dev, sizeof(*ddata), GFP_KERNEL); > + if (!ddata) > + return -ENOMEM; > + > + ddata->usb_dev = interface_to_usbdev(iface); > + mutex_init(&ddata->usb_lock); > + > + ret = usb_find_common_endpoints(iface->cur_altsetting, &bulk_in, > + &bulk_out, &intr_in, NULL); > + if (ret) { > + dev_err(&iface->dev, "Could not find all endpoints\n"); > + return -ENODEV; > + } > + > + ddata->ep_in = bulk_in->bEndpointAddress; > + ddata->ep_out = bulk_out->bEndpointAddress; > + ddata->ep_intr = intr_in->bEndpointAddress; > + ddata->ep_intr_interval = intr_in->bInterval; > + > + usb_set_intfdata(iface, ddata); > + > + ret = mfd_add_devices(&iface->dev, PLATFORM_DEVID_AUTO, ch341_devs, > + ARRAY_SIZE(ch341_devs), NULL, 0, NULL); > + if (ret) > + return dev_err_probe(&iface->dev, ret, > + "Failed to register child devices\n"); > + > + return 0; > +} > + > +static void ch341_usb_disconnect(struct usb_interface *usb_if) > +{ > + mfd_remove_devices(&usb_if->dev); > +} > + > +static const struct usb_device_id ch341_usb_table[] = { > + { USB_DEVICE(0x1a86, 0x5512) }, > + { } > +}; > +MODULE_DEVICE_TABLE(usb, ch341_usb_table); > + > +static struct usb_driver ch341_usb_driver = { > + .name = "ch341-mfd", > + .id_table = ch341_usb_table, > + .probe = ch341_usb_probe, > + .disconnect = ch341_usb_disconnect, > +}; > +module_usb_driver(ch341_usb_driver); > + > +MODULE_AUTHOR("Frank Zago <frank@zago.net>"); > +MODULE_DESCRIPTION("CH341 USB to I2C/SPI/GPIO adapter"); > +MODULE_LICENSE("GPL"); > diff --git a/include/linux/mfd/ch341.h b/include/linux/mfd/ch341.h > new file mode 100644 > index 000000000000..44f5da0720bd > --- /dev/null > +++ b/include/linux/mfd/ch341.h > @@ -0,0 +1,18 @@ > +/* SPDX-License-Identifier: GPL-2.0 */ > +/* Definitions for the CH341 driver */ > + > +#include <linux/mutex.h> > +#include <linux/types.h> > + > +struct usb_device; > +struct usb_interface; > + > +struct ch341_ddata { > + struct usb_device *usb_dev; > + struct mutex usb_lock; > + > + int ep_in; > + int ep_out; > + int ep_intr; > + u8 ep_intr_interval; > +};
On Mon, 27 Jun 2022, Greg Kroah-Hartman wrote: > On Mon, Jun 27, 2022 at 03:04:32PM +0100, Lee Jones wrote: > > USB review please. > > > > > The CH341 is a multifunction chip, presenting 3 different USB PID. One > > > > > > of these functions is for I2C/SPI/GPIO. This new set of drivers will > > > manage I2C and GPIO. > > > > > > Signed-off-by: frank zago <frank@zago.net> > > > --- > > > MAINTAINERS | 7 +++ > > > drivers/mfd/Kconfig | 10 +++++ > > > drivers/mfd/Makefile | 1 + > > > drivers/mfd/ch341-core.c | 90 +++++++++++++++++++++++++++++++++++++++ > > > include/linux/mfd/ch341.h | 18 ++++++++ > > > 5 files changed, 126 insertions(+) > > > create mode 100644 drivers/mfd/ch341-core.c > > > create mode 100644 include/linux/mfd/ch341.h > > > > > > diff --git a/MAINTAINERS b/MAINTAINERS > > > index 43d3d07afccd..628eeaa9bf68 100644 > > > --- a/MAINTAINERS > > > +++ b/MAINTAINERS > > > @@ -21475,6 +21475,13 @@ M: David Härdeman <david@hardeman.nu> > > > S: Maintained > > > F: drivers/media/rc/winbond-cir.c > > > > > > +WINCHIPHEAD CH341 I2C/GPIO MFD DRIVER > > > +M: Frank Zago <frank@zago.net> > > > +L: linux-usb@vger.kernel.org > > > +S: Maintained > > > +F: drivers/mfd/ch341-core.c > > > +F: include/linux/mfd/ch341.h > > > + > > > WINSYSTEMS EBC-C384 WATCHDOG DRIVER > > > M: William Breathitt Gray <vilhelm.gray@gmail.com> > > > L: linux-watchdog@vger.kernel.org > > > diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig > > > index 3b59456f5545..893acc821a42 100644 > > > --- a/drivers/mfd/Kconfig > > > +++ b/drivers/mfd/Kconfig > > > @@ -1784,6 +1784,16 @@ config MFD_LOCHNAGAR > > > help > > > Support for Cirrus Logic Lochnagar audio development board. > > > > > > +config MFD_CH341 > > > + tristate "WinChipHead CH341 in I2C/SPI/GPIO mode" > > > + depends on USB > > > + help > > > + If you say yes to this option, support for the CH341 series > > > + of chips, running in I2C/SPI/GPIO mode will be included. > > > + > > > + This driver can also be built as a module. If so, the > > > + module will be called ch341-core. > > > + > > > config MFD_ARIZONA > > > select REGMAP > > > select REGMAP_IRQ > > > diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile > > > index 858cacf659d6..fd615ab3929f 100644 > > > --- a/drivers/mfd/Makefile > > > +++ b/drivers/mfd/Makefile > > > @@ -13,6 +13,7 @@ obj-$(CONFIG_MFD_ASIC3) += asic3.o tmio_core.o > > > obj-$(CONFIG_ARCH_BCM2835) += bcm2835-pm.o > > > obj-$(CONFIG_MFD_BCM590XX) += bcm590xx.o > > > obj-$(CONFIG_MFD_BD9571MWV) += bd9571mwv.o > > > +obj-$(CONFIG_MFD_CH341) += ch341-core.o > > > obj-$(CONFIG_MFD_CROS_EC_DEV) += cros_ec_dev.o > > > obj-$(CONFIG_MFD_ENE_KB3930) += ene-kb3930.o > > > obj-$(CONFIG_MFD_EXYNOS_LPASS) += exynos-lpass.o > > > diff --git a/drivers/mfd/ch341-core.c b/drivers/mfd/ch341-core.c > > > new file mode 100644 > > > index 000000000000..f08a67dd6074 > > > --- /dev/null > > > +++ b/drivers/mfd/ch341-core.c > > > @@ -0,0 +1,90 @@ > > > +// SPDX-License-Identifier: GPL-2.0 > > > +/* > > > + * Core driver for the CH341A, CH341B and CH341T in I2C/SPI/GPIO > > > + * mode. There are cell drivers available for I2C and GPIO. SPI is not > > > + * yet supported. > > > + * > > > + * Copyright 2022, Frank Zago > > > + * Copyright (c) 2017 Gunar Schorcht (gunar@schorcht.net) > > > + * Copyright (c) 2016 Tse Lun Bien > > > + * Copyright (c) 2014 Marco Gittler > > > + * Copyright (c) 2006-2007 Till Harbaum (Till@Harbaum.org) > > > + */ > > > + > > > +#include <linux/kernel.h> > > > +#include <linux/mfd/ch341.h> > > > +#include <linux/mfd/core.h> > > > +#include <linux/module.h> > > > +#include <linux/slab.h> > > > +#include <linux/usb.h> > > > + > > > +static const struct mfd_cell ch341_devs[] = { > > > + { > > > + .name = "ch341-gpio", > > > + }, > > > + { > > > + .name = "ch341-i2c", > > > + }, > > > +}; > > > + > > > +static int ch341_usb_probe(struct usb_interface *iface, > > > + const struct usb_device_id *usb_id) > > > +{ > > > + struct usb_endpoint_descriptor *bulk_out; > > > + struct usb_endpoint_descriptor *bulk_in; > > > + struct usb_endpoint_descriptor *intr_in; > > > + struct ch341_ddata *ddata; > > > + int ret; > > > + > > > + ddata = devm_kzalloc(&iface->dev, sizeof(*ddata), GFP_KERNEL); > > > + if (!ddata) > > > + return -ENOMEM; > > > + > > > + ddata->usb_dev = interface_to_usbdev(iface); > > > + mutex_init(&ddata->usb_lock); > > > + > > > + ret = usb_find_common_endpoints(iface->cur_altsetting, &bulk_in, > > > + &bulk_out, &intr_in, NULL); > > > + if (ret) { > > > + dev_err(&iface->dev, "Could not find all endpoints\n"); > > > + return -ENODEV; > > > + } > > > + > > > + ddata->ep_in = bulk_in->bEndpointAddress; > > > + ddata->ep_out = bulk_out->bEndpointAddress; > > > + ddata->ep_intr = intr_in->bEndpointAddress; > > > + ddata->ep_intr_interval = intr_in->bInterval; > > > + > > > + usb_set_intfdata(iface, ddata); > > > + > > > + ret = mfd_add_devices(&iface->dev, PLATFORM_DEVID_AUTO, ch341_devs, > > > + ARRAY_SIZE(ch341_devs), NULL, 0, NULL); > > > + if (ret) > > > + return dev_err_probe(&iface->dev, ret, > > > + "Failed to register child devices\n"); > > > + > > > + return 0; > > > +} > > > + > > > +static void ch341_usb_disconnect(struct usb_interface *usb_if) > > > +{ > > > + mfd_remove_devices(&usb_if->dev); > > > +} > > > + > > > +static const struct usb_device_id ch341_usb_table[] = { > > > + { USB_DEVICE(0x1a86, 0x5512) }, > > > + { } > > > +}; > > > +MODULE_DEVICE_TABLE(usb, ch341_usb_table); > > > + > > > +static struct usb_driver ch341_usb_driver = { > > > + .name = "ch341-mfd", > > > + .id_table = ch341_usb_table, > > > + .probe = ch341_usb_probe, > > > + .disconnect = ch341_usb_disconnect, > > > +}; > > > +module_usb_driver(ch341_usb_driver); > > > + > > > +MODULE_AUTHOR("Frank Zago <frank@zago.net>"); > > > +MODULE_DESCRIPTION("CH341 USB to I2C/SPI/GPIO adapter"); > > > +MODULE_LICENSE("GPL"); > > > diff --git a/include/linux/mfd/ch341.h b/include/linux/mfd/ch341.h > > > new file mode 100644 > > > index 000000000000..44f5da0720bd > > > --- /dev/null > > > +++ b/include/linux/mfd/ch341.h > > > @@ -0,0 +1,18 @@ > > > +/* SPDX-License-Identifier: GPL-2.0 */ > > > +/* Definitions for the CH341 driver */ > > > + > > > +#include <linux/mutex.h> > > > +#include <linux/types.h> > > > + > > > +struct usb_device; > > > +struct usb_interface; > > > + > > > +struct ch341_ddata { > > > + struct usb_device *usb_dev; > > > + struct mutex usb_lock; > > > + > > > + int ep_in; > > > + int ep_out; > > > + int ep_intr; > > > + u8 ep_intr_interval; > > > +}; > > > Looks sane enough, but doesn't actually do any USB data transfers, maybe > that happens somewhere else... I expect those to happen in *both* of these: static const struct mfd_cell ch341_devs[] = { { .name = "ch341-gpio", }, { .name = "ch341-i2c", }, }; Is that correct Frank? > Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Thanks.
On 6/27/22 09:43, Lee Jones wrote: > On Mon, 27 Jun 2022, Greg Kroah-Hartman wrote: > >> On Mon, Jun 27, 2022 at 03:04:32PM +0100, Lee Jones wrote: >>> USB review please. >>> >>>> The CH341 is a multifunction chip, presenting 3 different USB PID. One >>>> >>>> of these functions is for I2C/SPI/GPIO. This new set of drivers will >>>> manage I2C and GPIO. >>>> >>>> Signed-off-by: frank zago <frank@zago.net> >>>> --- >>>> MAINTAINERS | 7 +++ >>>> drivers/mfd/Kconfig | 10 +++++ >>>> drivers/mfd/Makefile | 1 + >>>> drivers/mfd/ch341-core.c | 90 +++++++++++++++++++++++++++++++++++++++ >>>> include/linux/mfd/ch341.h | 18 ++++++++ >>>> 5 files changed, 126 insertions(+) >>>> create mode 100644 drivers/mfd/ch341-core.c >>>> create mode 100644 include/linux/mfd/ch341.h >>>> >>>> diff --git a/MAINTAINERS b/MAINTAINERS >>>> index 43d3d07afccd..628eeaa9bf68 100644 >>>> --- a/MAINTAINERS >>>> +++ b/MAINTAINERS >>>> @@ -21475,6 +21475,13 @@ M: David Härdeman <david@hardeman.nu> >>>> S: Maintained >>>> F: drivers/media/rc/winbond-cir.c >>>> >>>> +WINCHIPHEAD CH341 I2C/GPIO MFD DRIVER >>>> +M: Frank Zago <frank@zago.net> >>>> +L: linux-usb@vger.kernel.org >>>> +S: Maintained >>>> +F: drivers/mfd/ch341-core.c >>>> +F: include/linux/mfd/ch341.h >>>> + >>>> WINSYSTEMS EBC-C384 WATCHDOG DRIVER >>>> M: William Breathitt Gray <vilhelm.gray@gmail.com> >>>> L: linux-watchdog@vger.kernel.org >>>> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig >>>> index 3b59456f5545..893acc821a42 100644 >>>> --- a/drivers/mfd/Kconfig >>>> +++ b/drivers/mfd/Kconfig >>>> @@ -1784,6 +1784,16 @@ config MFD_LOCHNAGAR >>>> help >>>> Support for Cirrus Logic Lochnagar audio development board. >>>> >>>> +config MFD_CH341 >>>> + tristate "WinChipHead CH341 in I2C/SPI/GPIO mode" >>>> + depends on USB >>>> + help >>>> + If you say yes to this option, support for the CH341 series >>>> + of chips, running in I2C/SPI/GPIO mode will be included. >>>> + >>>> + This driver can also be built as a module. If so, the >>>> + module will be called ch341-core. >>>> + >>>> config MFD_ARIZONA >>>> select REGMAP >>>> select REGMAP_IRQ >>>> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile >>>> index 858cacf659d6..fd615ab3929f 100644 >>>> --- a/drivers/mfd/Makefile >>>> +++ b/drivers/mfd/Makefile >>>> @@ -13,6 +13,7 @@ obj-$(CONFIG_MFD_ASIC3) += asic3.o tmio_core.o >>>> obj-$(CONFIG_ARCH_BCM2835) += bcm2835-pm.o >>>> obj-$(CONFIG_MFD_BCM590XX) += bcm590xx.o >>>> obj-$(CONFIG_MFD_BD9571MWV) += bd9571mwv.o >>>> +obj-$(CONFIG_MFD_CH341) += ch341-core.o >>>> obj-$(CONFIG_MFD_CROS_EC_DEV) += cros_ec_dev.o >>>> obj-$(CONFIG_MFD_ENE_KB3930) += ene-kb3930.o >>>> obj-$(CONFIG_MFD_EXYNOS_LPASS) += exynos-lpass.o >>>> diff --git a/drivers/mfd/ch341-core.c b/drivers/mfd/ch341-core.c >>>> new file mode 100644 >>>> index 000000000000..f08a67dd6074 >>>> --- /dev/null >>>> +++ b/drivers/mfd/ch341-core.c >>>> @@ -0,0 +1,90 @@ >>>> +// SPDX-License-Identifier: GPL-2.0 >>>> +/* >>>> + * Core driver for the CH341A, CH341B and CH341T in I2C/SPI/GPIO >>>> + * mode. There are cell drivers available for I2C and GPIO. SPI is not >>>> + * yet supported. >>>> + * >>>> + * Copyright 2022, Frank Zago >>>> + * Copyright (c) 2017 Gunar Schorcht (gunar@schorcht.net) >>>> + * Copyright (c) 2016 Tse Lun Bien >>>> + * Copyright (c) 2014 Marco Gittler >>>> + * Copyright (c) 2006-2007 Till Harbaum (Till@Harbaum.org) >>>> + */ >>>> + >>>> +#include <linux/kernel.h> >>>> +#include <linux/mfd/ch341.h> >>>> +#include <linux/mfd/core.h> >>>> +#include <linux/module.h> >>>> +#include <linux/slab.h> >>>> +#include <linux/usb.h> >>>> + >>>> +static const struct mfd_cell ch341_devs[] = { >>>> + { >>>> + .name = "ch341-gpio", >>>> + }, >>>> + { >>>> + .name = "ch341-i2c", >>>> + }, >>>> +}; >>>> + >>>> +static int ch341_usb_probe(struct usb_interface *iface, >>>> + const struct usb_device_id *usb_id) >>>> +{ >>>> + struct usb_endpoint_descriptor *bulk_out; >>>> + struct usb_endpoint_descriptor *bulk_in; >>>> + struct usb_endpoint_descriptor *intr_in; >>>> + struct ch341_ddata *ddata; >>>> + int ret; >>>> + >>>> + ddata = devm_kzalloc(&iface->dev, sizeof(*ddata), GFP_KERNEL); >>>> + if (!ddata) >>>> + return -ENOMEM; >>>> + >>>> + ddata->usb_dev = interface_to_usbdev(iface); >>>> + mutex_init(&ddata->usb_lock); >>>> + >>>> + ret = usb_find_common_endpoints(iface->cur_altsetting, &bulk_in, >>>> + &bulk_out, &intr_in, NULL); >>>> + if (ret) { >>>> + dev_err(&iface->dev, "Could not find all endpoints\n"); >>>> + return -ENODEV; >>>> + } >>>> + >>>> + ddata->ep_in = bulk_in->bEndpointAddress; >>>> + ddata->ep_out = bulk_out->bEndpointAddress; >>>> + ddata->ep_intr = intr_in->bEndpointAddress; >>>> + ddata->ep_intr_interval = intr_in->bInterval; >>>> + >>>> + usb_set_intfdata(iface, ddata); >>>> + >>>> + ret = mfd_add_devices(&iface->dev, PLATFORM_DEVID_AUTO, ch341_devs, >>>> + ARRAY_SIZE(ch341_devs), NULL, 0, NULL); >>>> + if (ret) >>>> + return dev_err_probe(&iface->dev, ret, >>>> + "Failed to register child devices\n"); >>>> + >>>> + return 0; >>>> +} >>>> + >>>> +static void ch341_usb_disconnect(struct usb_interface *usb_if) >>>> +{ >>>> + mfd_remove_devices(&usb_if->dev); >>>> +} >>>> + >>>> +static const struct usb_device_id ch341_usb_table[] = { >>>> + { USB_DEVICE(0x1a86, 0x5512) }, >>>> + { } >>>> +}; >>>> +MODULE_DEVICE_TABLE(usb, ch341_usb_table); >>>> + >>>> +static struct usb_driver ch341_usb_driver = { >>>> + .name = "ch341-mfd", >>>> + .id_table = ch341_usb_table, >>>> + .probe = ch341_usb_probe, >>>> + .disconnect = ch341_usb_disconnect, >>>> +}; >>>> +module_usb_driver(ch341_usb_driver); >>>> + >>>> +MODULE_AUTHOR("Frank Zago <frank@zago.net>"); >>>> +MODULE_DESCRIPTION("CH341 USB to I2C/SPI/GPIO adapter"); >>>> +MODULE_LICENSE("GPL"); >>>> diff --git a/include/linux/mfd/ch341.h b/include/linux/mfd/ch341.h >>>> new file mode 100644 >>>> index 000000000000..44f5da0720bd >>>> --- /dev/null >>>> +++ b/include/linux/mfd/ch341.h >>>> @@ -0,0 +1,18 @@ >>>> +/* SPDX-License-Identifier: GPL-2.0 */ >>>> +/* Definitions for the CH341 driver */ >>>> + >>>> +#include <linux/mutex.h> >>>> +#include <linux/types.h> >>>> + >>>> +struct usb_device; >>>> +struct usb_interface; >>>> + >>>> +struct ch341_ddata { >>>> + struct usb_device *usb_dev; >>>> + struct mutex usb_lock; >>>> + >>>> + int ep_in; >>>> + int ep_out; >>>> + int ep_intr; >>>> + u8 ep_intr_interval; >>>> +}; >> >> >> Looks sane enough, but doesn't actually do any USB data transfers, maybe >> that happens somewhere else... > > I expect those to happen in *both* of these: > > static const struct mfd_cell ch341_devs[] = { > { > .name = "ch341-gpio", > }, > { > .name = "ch341-i2c", > }, > }; > > Is that correct Frank? Yes, that's correct. Frank
On Wed, 15 Jun 2022, frank zago wrote: > The CH341 is a multifunction chip, presenting 3 different USB PID. One > of these functions is for I2C/SPI/GPIO. This new set of drivers will > manage I2C and GPIO. > > Signed-off-by: frank zago <frank@zago.net> > --- > MAINTAINERS | 7 +++ > drivers/mfd/Kconfig | 10 +++++ > drivers/mfd/Makefile | 1 + > drivers/mfd/ch341-core.c | 90 +++++++++++++++++++++++++++++++++++++++ > include/linux/mfd/ch341.h | 18 ++++++++ > 5 files changed, 126 insertions(+) > create mode 100644 drivers/mfd/ch341-core.c > create mode 100644 include/linux/mfd/ch341.h > > diff --git a/MAINTAINERS b/MAINTAINERS > index 43d3d07afccd..628eeaa9bf68 100644 > --- a/MAINTAINERS > +++ b/MAINTAINERS > @@ -21475,6 +21475,13 @@ M: David Härdeman <david@hardeman.nu> > S: Maintained > F: drivers/media/rc/winbond-cir.c > > +WINCHIPHEAD CH341 I2C/GPIO MFD DRIVER > +M: Frank Zago <frank@zago.net> > +L: linux-usb@vger.kernel.org > +S: Maintained > +F: drivers/mfd/ch341-core.c > +F: include/linux/mfd/ch341.h > + > WINSYSTEMS EBC-C384 WATCHDOG DRIVER > M: William Breathitt Gray <vilhelm.gray@gmail.com> > L: linux-watchdog@vger.kernel.org > diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig > index 3b59456f5545..893acc821a42 100644 > --- a/drivers/mfd/Kconfig > +++ b/drivers/mfd/Kconfig > @@ -1784,6 +1784,16 @@ config MFD_LOCHNAGAR > help > Support for Cirrus Logic Lochnagar audio development board. > > +config MFD_CH341 > + tristate "WinChipHead CH341 in I2C/SPI/GPIO mode" > + depends on USB > + help > + If you say yes to this option, support for the CH341 series > + of chips, running in I2C/SPI/GPIO mode will be included. > + > + This driver can also be built as a module. If so, the > + module will be called ch341-core. > + > config MFD_ARIZONA > select REGMAP > select REGMAP_IRQ > diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile > index 858cacf659d6..fd615ab3929f 100644 > --- a/drivers/mfd/Makefile > +++ b/drivers/mfd/Makefile > @@ -13,6 +13,7 @@ obj-$(CONFIG_MFD_ASIC3) += asic3.o tmio_core.o > obj-$(CONFIG_ARCH_BCM2835) += bcm2835-pm.o > obj-$(CONFIG_MFD_BCM590XX) += bcm590xx.o > obj-$(CONFIG_MFD_BD9571MWV) += bd9571mwv.o > +obj-$(CONFIG_MFD_CH341) += ch341-core.o > obj-$(CONFIG_MFD_CROS_EC_DEV) += cros_ec_dev.o > obj-$(CONFIG_MFD_ENE_KB3930) += ene-kb3930.o > obj-$(CONFIG_MFD_EXYNOS_LPASS) += exynos-lpass.o > diff --git a/drivers/mfd/ch341-core.c b/drivers/mfd/ch341-core.c > new file mode 100644 > index 000000000000..f08a67dd6074 > --- /dev/null > +++ b/drivers/mfd/ch341-core.c > @@ -0,0 +1,90 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * Core driver for the CH341A, CH341B and CH341T in I2C/SPI/GPIO > + * mode. There are cell drivers available for I2C and GPIO. SPI is not > + * yet supported. > + * > + * Copyright 2022, Frank Zago > + * Copyright (c) 2017 Gunar Schorcht (gunar@schorcht.net) > + * Copyright (c) 2016 Tse Lun Bien > + * Copyright (c) 2014 Marco Gittler > + * Copyright (c) 2006-2007 Till Harbaum (Till@Harbaum.org) > + */ > + > +#include <linux/kernel.h> > +#include <linux/mfd/ch341.h> > +#include <linux/mfd/core.h> > +#include <linux/module.h> > +#include <linux/slab.h> > +#include <linux/usb.h> > + > +static const struct mfd_cell ch341_devs[] = { > + { > + .name = "ch341-gpio", > + }, > + { > + .name = "ch341-i2c", > + }, > +}; These should both be on one line each. > +static int ch341_usb_probe(struct usb_interface *iface, > + const struct usb_device_id *usb_id) > +{ > + struct usb_endpoint_descriptor *bulk_out; > + struct usb_endpoint_descriptor *bulk_in; > + struct usb_endpoint_descriptor *intr_in; > + struct ch341_ddata *ddata; > + int ret; > + > + ddata = devm_kzalloc(&iface->dev, sizeof(*ddata), GFP_KERNEL); > + if (!ddata) > + return -ENOMEM; > + > + ddata->usb_dev = interface_to_usbdev(iface); > + mutex_init(&ddata->usb_lock); > + > + ret = usb_find_common_endpoints(iface->cur_altsetting, &bulk_in, > + &bulk_out, &intr_in, NULL); > + if (ret) { > + dev_err(&iface->dev, "Could not find all endpoints\n"); > + return -ENODEV; > + } > + > + ddata->ep_in = bulk_in->bEndpointAddress; > + ddata->ep_out = bulk_out->bEndpointAddress; > + ddata->ep_intr = intr_in->bEndpointAddress; > + ddata->ep_intr_interval = intr_in->bInterval; > + > + usb_set_intfdata(iface, ddata); > + > + ret = mfd_add_devices(&iface->dev, PLATFORM_DEVID_AUTO, ch341_devs, > + ARRAY_SIZE(ch341_devs), NULL, 0, NULL); > + if (ret) > + return dev_err_probe(&iface->dev, ret, > + "Failed to register child devices\n"); > + > + return 0; > +} > + > +static void ch341_usb_disconnect(struct usb_interface *usb_if) > +{ > + mfd_remove_devices(&usb_if->dev); Why not use the devm_* version? > +} > + > +static const struct usb_device_id ch341_usb_table[] = { > + { USB_DEVICE(0x1a86, 0x5512) }, > + { } > +}; > +MODULE_DEVICE_TABLE(usb, ch341_usb_table); > + > +static struct usb_driver ch341_usb_driver = { > + .name = "ch341-mfd", > + .id_table = ch341_usb_table, > + .probe = ch341_usb_probe, > + .disconnect = ch341_usb_disconnect, > +}; > +module_usb_driver(ch341_usb_driver); > + > +MODULE_AUTHOR("Frank Zago <frank@zago.net>"); > +MODULE_DESCRIPTION("CH341 USB to I2C/SPI/GPIO adapter"); > +MODULE_LICENSE("GPL"); > diff --git a/include/linux/mfd/ch341.h b/include/linux/mfd/ch341.h > new file mode 100644 > index 000000000000..44f5da0720bd > --- /dev/null > +++ b/include/linux/mfd/ch341.h > @@ -0,0 +1,18 @@ > +/* SPDX-License-Identifier: GPL-2.0 */ > +/* Definitions for the CH341 driver */ What definitions? > + > +#include <linux/mutex.h> > +#include <linux/types.h> > + > +struct usb_device; > +struct usb_interface; > + > +struct ch341_ddata { > + struct usb_device *usb_dev; > + struct mutex usb_lock; > + > + int ep_in; > + int ep_out; > + int ep_intr; > + u8 ep_intr_interval; > +};
diff --git a/MAINTAINERS b/MAINTAINERS index 43d3d07afccd..628eeaa9bf68 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -21475,6 +21475,13 @@ M: David Härdeman <david@hardeman.nu> S: Maintained F: drivers/media/rc/winbond-cir.c +WINCHIPHEAD CH341 I2C/GPIO MFD DRIVER +M: Frank Zago <frank@zago.net> +L: linux-usb@vger.kernel.org +S: Maintained +F: drivers/mfd/ch341-core.c +F: include/linux/mfd/ch341.h + WINSYSTEMS EBC-C384 WATCHDOG DRIVER M: William Breathitt Gray <vilhelm.gray@gmail.com> L: linux-watchdog@vger.kernel.org diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index 3b59456f5545..893acc821a42 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -1784,6 +1784,16 @@ config MFD_LOCHNAGAR help Support for Cirrus Logic Lochnagar audio development board. +config MFD_CH341 + tristate "WinChipHead CH341 in I2C/SPI/GPIO mode" + depends on USB + help + If you say yes to this option, support for the CH341 series + of chips, running in I2C/SPI/GPIO mode will be included. + + This driver can also be built as a module. If so, the + module will be called ch341-core. + config MFD_ARIZONA select REGMAP select REGMAP_IRQ diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile index 858cacf659d6..fd615ab3929f 100644 --- a/drivers/mfd/Makefile +++ b/drivers/mfd/Makefile @@ -13,6 +13,7 @@ obj-$(CONFIG_MFD_ASIC3) += asic3.o tmio_core.o obj-$(CONFIG_ARCH_BCM2835) += bcm2835-pm.o obj-$(CONFIG_MFD_BCM590XX) += bcm590xx.o obj-$(CONFIG_MFD_BD9571MWV) += bd9571mwv.o +obj-$(CONFIG_MFD_CH341) += ch341-core.o obj-$(CONFIG_MFD_CROS_EC_DEV) += cros_ec_dev.o obj-$(CONFIG_MFD_ENE_KB3930) += ene-kb3930.o obj-$(CONFIG_MFD_EXYNOS_LPASS) += exynos-lpass.o diff --git a/drivers/mfd/ch341-core.c b/drivers/mfd/ch341-core.c new file mode 100644 index 000000000000..f08a67dd6074 --- /dev/null +++ b/drivers/mfd/ch341-core.c @@ -0,0 +1,90 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Core driver for the CH341A, CH341B and CH341T in I2C/SPI/GPIO + * mode. There are cell drivers available for I2C and GPIO. SPI is not + * yet supported. + * + * Copyright 2022, Frank Zago + * Copyright (c) 2017 Gunar Schorcht (gunar@schorcht.net) + * Copyright (c) 2016 Tse Lun Bien + * Copyright (c) 2014 Marco Gittler + * Copyright (c) 2006-2007 Till Harbaum (Till@Harbaum.org) + */ + +#include <linux/kernel.h> +#include <linux/mfd/ch341.h> +#include <linux/mfd/core.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/usb.h> + +static const struct mfd_cell ch341_devs[] = { + { + .name = "ch341-gpio", + }, + { + .name = "ch341-i2c", + }, +}; + +static int ch341_usb_probe(struct usb_interface *iface, + const struct usb_device_id *usb_id) +{ + struct usb_endpoint_descriptor *bulk_out; + struct usb_endpoint_descriptor *bulk_in; + struct usb_endpoint_descriptor *intr_in; + struct ch341_ddata *ddata; + int ret; + + ddata = devm_kzalloc(&iface->dev, sizeof(*ddata), GFP_KERNEL); + if (!ddata) + return -ENOMEM; + + ddata->usb_dev = interface_to_usbdev(iface); + mutex_init(&ddata->usb_lock); + + ret = usb_find_common_endpoints(iface->cur_altsetting, &bulk_in, + &bulk_out, &intr_in, NULL); + if (ret) { + dev_err(&iface->dev, "Could not find all endpoints\n"); + return -ENODEV; + } + + ddata->ep_in = bulk_in->bEndpointAddress; + ddata->ep_out = bulk_out->bEndpointAddress; + ddata->ep_intr = intr_in->bEndpointAddress; + ddata->ep_intr_interval = intr_in->bInterval; + + usb_set_intfdata(iface, ddata); + + ret = mfd_add_devices(&iface->dev, PLATFORM_DEVID_AUTO, ch341_devs, + ARRAY_SIZE(ch341_devs), NULL, 0, NULL); + if (ret) + return dev_err_probe(&iface->dev, ret, + "Failed to register child devices\n"); + + return 0; +} + +static void ch341_usb_disconnect(struct usb_interface *usb_if) +{ + mfd_remove_devices(&usb_if->dev); +} + +static const struct usb_device_id ch341_usb_table[] = { + { USB_DEVICE(0x1a86, 0x5512) }, + { } +}; +MODULE_DEVICE_TABLE(usb, ch341_usb_table); + +static struct usb_driver ch341_usb_driver = { + .name = "ch341-mfd", + .id_table = ch341_usb_table, + .probe = ch341_usb_probe, + .disconnect = ch341_usb_disconnect, +}; +module_usb_driver(ch341_usb_driver); + +MODULE_AUTHOR("Frank Zago <frank@zago.net>"); +MODULE_DESCRIPTION("CH341 USB to I2C/SPI/GPIO adapter"); +MODULE_LICENSE("GPL"); diff --git a/include/linux/mfd/ch341.h b/include/linux/mfd/ch341.h new file mode 100644 index 000000000000..44f5da0720bd --- /dev/null +++ b/include/linux/mfd/ch341.h @@ -0,0 +1,18 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Definitions for the CH341 driver */ + +#include <linux/mutex.h> +#include <linux/types.h> + +struct usb_device; +struct usb_interface; + +struct ch341_ddata { + struct usb_device *usb_dev; + struct mutex usb_lock; + + int ep_in; + int ep_out; + int ep_intr; + u8 ep_intr_interval; +};
The CH341 is a multifunction chip, presenting 3 different USB PID. One of these functions is for I2C/SPI/GPIO. This new set of drivers will manage I2C and GPIO. Signed-off-by: frank zago <frank@zago.net> --- MAINTAINERS | 7 +++ drivers/mfd/Kconfig | 10 +++++ drivers/mfd/Makefile | 1 + drivers/mfd/ch341-core.c | 90 +++++++++++++++++++++++++++++++++++++++ include/linux/mfd/ch341.h | 18 ++++++++ 5 files changed, 126 insertions(+) create mode 100644 drivers/mfd/ch341-core.c create mode 100644 include/linux/mfd/ch341.h