On Tue, 31 May 2016, Andrew F. Davis wrote: > The TI SM-USB-DIG is a USB to SPI/I2C/1Wire/GPIO adapter. > Add MFD core support. > > Signed-off-by: Andrew F. Davis <[email protected]> > --- > The SPI, GPIO, and 1Wire drivers are WIP. > > drivers/mfd/Kconfig | 8 +++ > drivers/mfd/Makefile | 2 + > drivers/mfd/sm-usb-dig.c | 138 > +++++++++++++++++++++++++++++++++++++++++ > include/linux/mfd/sm-usb-dig.h | 73 ++++++++++++++++++++++ > 4 files changed, 221 insertions(+) > create mode 100644 drivers/mfd/sm-usb-dig.c > create mode 100644 include/linux/mfd/sm-usb-dig.h > > diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig > index 1bcf601..455219a 100644 > --- a/drivers/mfd/Kconfig > +++ b/drivers/mfd/Kconfig > @@ -1373,6 +1373,14 @@ config MFD_LM3533 > additional drivers must be enabled in order to use the LED, > backlight or ambient-light-sensor functionality of the device. > > +config MFD_SM_USB_DIG > + tristate "Texas Instruments SM-USB-DIG interface adapter"
If it is decided that MFD is truly the best place for this driver, you are still going to need a USB Ack for it. > + select MFD_CORE > + help > + Support for the TI SM-USB-DIG USB to SPI/I2C/1Wire/GPIO adapter. > + Additional drivers such as SPI_SM_USB_DIG, I2C_SM_USB_DIG, etc. must > + be enabled in order to use the functionality of the device. > + > config MFD_TIMBERDALE > tristate "Timberdale FPGA" > select MFD_CORE > diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile > index 42a66e1..376013e 100644 > --- a/drivers/mfd/Makefile > +++ b/drivers/mfd/Makefile > @@ -68,6 +68,8 @@ obj-$(CONFIG_MFD_WM8350_I2C) += wm8350-i2c.o > wm8994-objs := wm8994-core.o wm8994-irq.o wm8994-regmap.o > obj-$(CONFIG_MFD_WM8994) += wm8994.o > > +obj-$(CONFIG_MFD_SM_USB_DIG) += sm-usb-dig.o > + > obj-$(CONFIG_TPS6105X) += tps6105x.o > obj-$(CONFIG_TPS65010) += tps65010.o > obj-$(CONFIG_TPS6507X) += tps6507x.o > diff --git a/drivers/mfd/sm-usb-dig.c b/drivers/mfd/sm-usb-dig.c > new file mode 100644 > index 0000000..cf7ccab > --- /dev/null > +++ b/drivers/mfd/sm-usb-dig.c This should probably be ti-sm-usb-dig.c > @@ -0,0 +1,138 @@ > +/* > + * MFD Core driver for TI SM-USB-DIG > + * > + * Copyright (C) 2016 Texas Instruments Incorporated - http://www.ti.com/ > + * Andrew F. Davis <[email protected]> > + * > + * This program is free software; you can redistribute it and/or > + * modify it under the terms of the GNU General Public License version 2 as > + * published by the Free Software Foundation. > + * > + * This program is distributed "as is" WITHOUT ANY WARRANTY of any > + * kind, whether expressed or implied; without even the implied warranty > + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > + * GNU General Public License version 2 for more details. > + */ > + > +#include <linux/usb.h> > +#include <linux/mfd/core.h> > +#include <linux/module.h> > + > +#include <linux/mfd/sm-usb-dig.h> All alphabetical. > +#define USB_VENDOR_ID_TI 0x0451 > +#define USB_DEVICE_ID_TI_SM_USB_DIG 0x2f90 TI at the beginning. > +#define SMUSBDIG_USB_TIMEOUT 1000 /* in ms */ Rename to SMUSBDIG_USB_TIMEOUT_MS > +struct smusbdig_device { > + struct usb_device *usb_dev; > + struct usb_interface *interface; > +}; s/smusbdig/ti_smusbdig/ ... throughout. > +int smusbdig_xfer(struct smusbdig_device *smusbdig, u8 *buffer, int size) > +{ > + struct device *dev = &smusbdig->interface->dev; > + int actual_length, ret; > + > + if (!smusbdig || !buffer || size <= 0) > + return -EINVAL; > + > + ret = usb_interrupt_msg(smusbdig->usb_dev, > + usb_sndctrlpipe(smusbdig->usb_dev, 1), > + buffer, size, &actual_length, > + SMUSBDIG_USB_TIMEOUT); > + if (ret) { > + dev_err(dev, "USB transaction failed\n"); > + return ret; > + } > + > + ret = usb_interrupt_msg(smusbdig->usb_dev, > + usb_rcvctrlpipe(smusbdig->usb_dev, 1), > + buffer, SMUSBDIG_PACKET_SIZE, &actual_length, > + SMUSBDIG_USB_TIMEOUT); > + if (ret) { > + dev_err(dev, "USB transaction failed\n"); > + return ret; > + } > + > + return 0; > +} > +EXPORT_SYMBOL_GPL(smusbdig_xfer); > + > +static const struct mfd_cell smusbdig_mfd_cells[] = { > + { .name = "sm-usb-dig-gpio", }, > + { .name = "sm-usb-dig-i2c", }, > + { .name = "sm-usb-dig-spi", }, > + { .name = "sm-usb-dig-w1", }, > +}; > + > +static int smusbdig_probe(struct usb_interface *interface, > + const struct usb_device_id *usb_id) > +{ > + struct usb_host_interface *hostif = interface->cur_altsetting; > + struct device *dev = &interface->dev; > + struct smusbdig_device *smusbdig; > + u8 buffer[SMUSBDIG_PACKET_SIZE]; > + int ret; > + > + if (hostif->desc.bInterfaceNumber != 0 || > + hostif->desc.bNumEndpoints < 2) > + return -ENODEV; > + > + smusbdig = devm_kzalloc(dev, sizeof(*smusbdig), GFP_KERNEL); > + if (!smusbdig) > + return -ENOMEM; > + > + smusbdig->usb_dev = usb_get_dev(interface_to_usbdev(interface)); > + smusbdig->interface = interface; > + usb_set_intfdata(interface, smusbdig); > + > + buffer[0] = SMUSBDIG_VERSION; > + ret = smusbdig_xfer(smusbdig, buffer, 1); > + if (ret) > + return ret; > + > + dev_info(dev, "TI SM-USB-DIG Version: %d.%02d Found\n", > + buffer[0], buffer[1]); > + > + /* Turn on power supply output */ > + buffer[0] = SMUSBDIG_COMMAND; > + buffer[1] = SMUSBDIG_COMMAND_DUTPOWERON; > + ret = smusbdig_xfer(smusbdig, buffer, 2); > + if (ret) > + return ret; > + > + dev_set_drvdata(dev, smusbdig); > + ret = mfd_add_hotplug_devices(dev, smusbdig_mfd_cells, > + ARRAY_SIZE(smusbdig_mfd_cells)); > + if (ret) { > + dev_err(dev, "unable to add MFD devices\n"); > + return ret; > + } > + > + return 0; > +} > + > +void smusbdig_disconnect(struct usb_interface *interface) > +{ > + mfd_remove_devices(&interface->dev); > +} > + > +static const struct usb_device_id smusbdig_id_table[] = { > + { USB_DEVICE(USB_VENDOR_ID_TI, USB_DEVICE_ID_TI_SM_USB_DIG) }, > + { /* sentinel */ } > +}; > +MODULE_DEVICE_TABLE(usb, smusbdig_id_table); > + > +static struct usb_driver smusbdig_driver = { > + .name = "sm-usb-dig", > + .probe = smusbdig_probe, > + .disconnect = smusbdig_disconnect, > + .id_table = smusbdig_id_table, > +}; > +module_usb_driver(smusbdig_driver); This doesn't look like an MFD driver. Why aren't you putting this in the USB subsystem? > +MODULE_AUTHOR("Andrew F. Davis <[email protected]>"); > +MODULE_DESCRIPTION("Core driver for TI SM-USB-DIG interface adapter"); > +MODULE_LICENSE("GPL v2"); > diff --git a/include/linux/mfd/sm-usb-dig.h b/include/linux/mfd/sm-usb-dig.h > new file mode 100644 > index 0000000..1558ff2 > --- /dev/null > +++ b/include/linux/mfd/sm-usb-dig.h > @@ -0,0 +1,73 @@ > +/* > + * Copyright (C) 2016 Texas Instruments Incorporated - http://www.ti.com/ > + * Andrew F. Davis <[email protected]> > + * > + * This program is free software; you can redistribute it and/or > + * modify it under the terms of the GNU General Public License version 2 as > + * published by the Free Software Foundation. > + * > + * This program is distributed "as is" WITHOUT ANY WARRANTY of any > + * kind, whether expressed or implied; without even the implied warranty > + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > + * GNU General Public License version 2 for more details. > + */ > + > +#ifndef __LINUX_MFD_SM_USB_DIG_H > +#define __LINUX_MFD_SM_USB_DIG_H > + > +#define SMUSBDIG_PACKET_SIZE 32 > +/* (packet size - packet header */ > +#define SMUSBDIG_DATA_SIZE (SMUSBDIG_PACKET_SIZE - 7) > + > +enum smusbdig_function { > + SMUSBDIG_SPI = 0x01, > + SMUSBDIG_I2C = 0x02, > + SMUSBDIG_1W = 0x03, > + SMUSBDIG_COMMAND = 0x04, > + SMUSBDIG_VERSION = 0x07, > +}; > + > +enum smusbdig_sub_command { > + SMUSBDIG_COMMAND_DUTPOWERON = 0x01, > + SMUSBDIG_COMMAND_DUTPOWEROFF = 0x02, > +}; > + > +struct smusbdig_packet { > + u8 function; > + u8 channel; > + u8 edge_polarity; > + u8 num_commands; > + u8 is_command_mask[3]; > + u8 data[SMUSBDIG_DATA_SIZE]; > +} __packed; > + > +static void smusbdig_packet_add_command(struct smusbdig_packet *packet, > + int command) > +{ > + int num_commands = packet->num_commands; > + int mask_number = num_commands / 8; > + int mask_bit = num_commands % 8; > + > + if (num_commands >= SMUSBDIG_DATA_SIZE) > + return; > + > + packet->is_command_mask[mask_number] |= BIT(7 - mask_bit); > + packet->data[num_commands] = command; > + packet->num_commands++; > +} Inline? > +static void smusbdig_packet_add_data(struct smusbdig_packet *packet, u8 data) > +{ > + int num_commands = packet->num_commands; > + > + if (num_commands >= SMUSBDIG_DATA_SIZE) > + return; > + > + packet->data[num_commands] = data; > + packet->num_commands++; > +} Inline? > +struct smusbdig_device; > +int smusbdig_xfer(struct smusbdig_device *smusbdig, u8 *buffer, int size); > + > +#endif /* __LINUX_MFD_SM_USB_DIG_H */ -- Lee Jones Linaro STMicroelectronics Landing Team Lead Linaro.org │ Open source software for ARM SoCs Follow Linaro: Facebook | Twitter | Blog
