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platform/chrome: cros_ec_proto: Introduce cros_ec_cmd_readmem()

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To read from the EC memory different mechanism are possible.
ECs connected via LPC expose their memory via a ->cmd_readmem operation.
Other protocols require the usage of EC_CMD_READ_MEMMAP, which on the
other hand is not implemented by LPC ECs.

Provide a helper that automatically selects the correct mechanism.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20240529-cros_ec-hwmon-v4-1-5cdf0c5db50a@weissschuh.net
Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>
This commit is contained in:
Thomas Weißschuh
2024-05-29 08:27:11 +02:00
committed by Tzung-Bi Shih
parent 7b44d5381e
commit a14a569a99
2 changed files with 29 additions and 0 deletions
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include/linux/platform_data/cros_ec_proto.h
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@@ -261,6 +261,8 @@ int cros_ec_get_sensor_count(struct cros_ec_dev *ec);
int cros_ec_cmd(struct cros_ec_device *ec_dev, unsigned int version, int command, const void *outdata,
size_t outsize, void *indata, size_t insize);
int cros_ec_cmd_readmem(struct cros_ec_device *ec_dev, u8 offset, u8 size, void *dest);
/**
* cros_ec_get_time_ns() - Return time in ns.
*