[v4,0/7] hwmon: pmbus: adm1266: add support

Message

Alexandru Tachici June 23, 2020, 5:36 p.m. UTC

From: Alexandru Tachici <[e-mail]>

Add PMBus probing driver for the adm1266 Cascadable
Super Sequencer with Margin Control and Fault Recording.
Driver is using the pmbus_core, creating sysfs files
under hwmon for inputs: vh1->vh4 and vp1->vp13.

1. Add PMBus probing driver for inputs vh1->vh4
and vp1->vp13.

2. Add Block Write-Read Process Call command.
A PMBus specific implementation was required because
block write with I2C_SMBUS_PROC_CALL flag allows a
maximum of 32 bytes to be received.

3. This makes adm1266 driver expose GPIOs
to user-space. Currently are read only. Future
developments on the firmware will allow
them to be writable.

4. Add two ioctl commands for issuing GO_COMMAND
and reading the state of the adm1266 sequencer.

5. Blackboxes are 64 bytes of chip state related data
that is generated on faults. Use the nvmem kernel api
to expose the blackbox chip functionality to userspace.

6. Expose BLACKBOX_INFO register through debugfs.

7. Device tree bindings for ADM1266.

Alexandru Tachici (7):
  hwmon: pmbus: adm1266: add support
  hwmon: pmbus: adm1266: Add Block process call
  hwmon: pmbus: adm1266: Add support for GPIOs
  hwmon: pmbus: adm1266: Add ioctl commands
  hwmon: pmbus: adm1266: read blackbox
  hwmon: pmbus: adm1266: debugfs for blackbox info
  dt-bindings: hwmon: Add bindings for ADM1266

Changelog v3 -> v4:
- moved pmbus_block_wr (pmbus process call) from pmbus_core.
to adm1266.c and renamed to pmbus_block_xfer
- in pmbus_block_xfer: fixed buffer size bug (from 255 to 257)
- in adm1266_gpio_get_multiple: handle pdios and gpios one at a time
to lower allocated space on stack
- in adm1266_gpio_dbg_show: replaced write_buf with u8 write_cmd var
- in adm1266_gpio_dbg_show: check number of bytes received from device
returned by pmbus_block_xfer.
- now use ioctl to send GO_COMMAND and retrieve current state of adm1266
- split blackbox commit into blackbox nvmem implementation and debugfs
blackbox info debugfs
- create adm1266 debugfs dir under /sys/kernel/debug/pmbus/hwmon for
blackbox_info

 .../bindings/hwmon/adi,adm1266.yaml           |  56 ++
 Documentation/hwmon/adm1266.rst               |  50 ++
 .../userspace-api/ioctl/ioctl-number.rst      |   1 +
 drivers/hwmon/pmbus/Kconfig                   |  10 +
 drivers/hwmon/pmbus/Makefile                  |   1 +
 drivers/hwmon/pmbus/adm1266.c                 | 657 ++++++++++++++++++
 include/uapi/linux/adm1266.h                  |  16 +
 7 files changed, 791 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/hwmon/adi,adm1266.yaml
 create mode 100644 Documentation/hwmon/adm1266.rst
 create mode 100644 drivers/hwmon/pmbus/adm1266.c
 create mode 100644 include/uapi/linux/adm1266.h