[PATCH v19 0/4] Add Intel LJCA device driver

Wentong Wu
2023-09-16T18:54:36Z

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.

---
v19:
- add v17's change which v18 doesn't apply

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 | 13 +
drivers/usb/misc/Makefile | 1 +
drivers/usb/misc/usb-ljca.c | 837 ++++++++++++++++++++++++++++++++++++++++++
include/linux/usb/ljca.h | 145 ++++++++
12 files changed, 1804 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

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