[v18,0/4] Add Intel LJCA device driver

Add driver for Intel La Jolla Cove Adapter (LJCA) device. This
IO-expander adds additional functions to the host system such
as GPIO, I2C and SPI with USB host interface. We add 4 drivers
to support this device: a USB driver, a GPIO chip driver, a I2C
controller driver and a SPI controller driver.

---
v18:
 - rebase patch set on top of Linus' master branch (57d88e8a5974644039fbc47806bac7bb12025636)

v17:
 - change valid_pins type to __le32 and access valid_pins with get_unaligned_le32
 - remove COMPILE_TEST for USB_LJCA Kconfig

v16:
 - drop all void * and use real types in the exported apis and internal ljca_send()
 - remove #ifdef in usb-ljca.c file
 - add documentation in ljca.h for the public structures
 - add error message in ljca_handle_cmd_ack() if error happens and remove blank line
 - use the functionality in cleanup.h for spinlock to make function much simpler
 - change the type of ex_buf in struct ljca_adapter to u8 *

v15:
 - enhance disconnect() of usb-ljca driver
 - change memchr to strchr in ljca_match_device_ids() of usb-ljca driver

v14:
 - fix build error: implicit declaration of function 'acpi_dev_clear_dependencies'

v13:
 - make ljca-usb more robust with the help of Hans de Goede
 - call acpi_dev_clear_dependencies() to mark _DEP ACPI dependencies on the I2C controller as satisfied, and patch is from Hans de Goede

v12:
 - switch dev_err to dev_dbg for i2c-ljca driver
 - avoid err printing because of calling usb_kill_urb when attempts to resubmit the rx urb

v11:
 - switch dev_err to dev_dbg for i2c-ljca driver
 - remove message length check because of defined quirk structure
 - remove I2C_FUNC_SMBUS_EMUL support

v10:
 - remove ljca_i2c_format_slave_addr
 - remove memset before write write w_packet
 - make ljca_i2c_stop void and print err message in case failure
 - use dev_err_probe in ljca_i2c_probe function

v9:
 - overhaul usb-ljca driver to make it more structured and easy understand
 - fix memory leak issue for usb-ljca driver
 - add spinlock to protect tx_buf and ex_buf
 - change exported APIs for usb-ljca driver
 - unify prefix for structures and functions for i2c-ljca driver
 - unify prefix for structures and functions for spi-ljca driver
 - unify prefix for structures and functions for gpio-ljca driver
 - update gpio-ljca, i2c-ljca and spi-ljca drivers according to usb-ljca's changes

Wentong Wu (4):
  usb: Add support for Intel LJCA device
  i2c: Add support for Intel LJCA USB I2C driver
  spi: Add support for Intel LJCA USB SPI driver
  gpio: update Intel LJCA USB GPIO driver

 drivers/gpio/Kconfig          |   4 +-
 drivers/gpio/gpio-ljca.c      | 246 +++++++------
 drivers/i2c/busses/Kconfig    |  11 +
 drivers/i2c/busses/Makefile   |   1 +
 drivers/i2c/busses/i2c-ljca.c | 342 +++++++++++++++++
 drivers/spi/Kconfig           |  11 +
 drivers/spi/Makefile          |   1 +
 drivers/spi/spi-ljca.c        | 297 +++++++++++++++
 drivers/usb/misc/Kconfig      |  14 +
 drivers/usb/misc/Makefile     |   1 +
 drivers/usb/misc/usb-ljca.c   | 835 ++++++++++++++++++++++++++++++++++++++++++
 include/linux/usb/ljca.h      | 145 ++++++++
 12 files changed, 1803 insertions(+), 105 deletions(-)
 create mode 100644 drivers/i2c/busses/i2c-ljca.c
 create mode 100644 drivers/spi/spi-ljca.c
 create mode 100644 drivers/usb/misc/usb-ljca.c
 create mode 100644 include/linux/usb/ljca.h