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lspcon_i2c_spi: support a devpath option

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Some callers may find it easier to provide the path to an I2C device
at which to communicate with the device, rather than specify the bus
number- doing so might involve trying to parse a path to extract the
number only for flashrom to do the reverse, which is error-prone and
unnecessary.

This change adds support for a `devpath` option, continuing to
allow `bus` and requiring only one of them be specified.

TEST=Verified --flash-size outputs correct values with both
     devpath=/dev/i2c-7 and bus=7, as well as noting that one is
     required if neither is specified and only one may be specified
     if both are given.

Signed-off-by: Peter Marheine <pmarheine@chromium.org>
Change-Id: Id2adf8a307b9205ce5e5804a6c3e22f19d0c34c9
Reviewed-on: https://review.coreboot.org/c/flashrom/+/51967
Reviewed-by: Edward O'Callaghan <quasisec@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Peter Marheine
2021-03-31 11:28:11 +11:00
committed by Angel Pons
parent d4063bf3a7
commit 0969e43b3f
3 changed files with 78 additions and 50 deletions
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8
i2c_helper.h
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@ -71,6 +71,14 @@ static inline int i2c_buffer_t_fill(i2c_buffer_t *i2c_buf, void *buf, uint16_t l
*/
int i2c_open(int bus, uint16_t addr, int force);
/**
* i2c_open_path: open an I2C device by device path
*
* This function behaves the same as i2c_open, but takes a filesystem
* path (assumed to be an I2C device file) instead of a bus number.
*/
int i2c_open_path(const char *path, uint16_t addr, int force);
/**
* i2c_close - closes the file descriptor returned by i2c_open
*