@@ -1035,3 +1035,30 @@ int cros_ec_cmd(struct cros_ec_device *ec_dev,
return ret;
}
EXPORT_SYMBOL_GPL(cros_ec_cmd);
+
+/**
+ * cros_ec_cmd_readmem - Read from EC memory.
+ *
+ * @ec_dev: EC device
+ * @offset: Is within EC_LPC_ADDR_MEMMAP region.
+ * @size: Number of bytes to read.
+ * @dest: EC command output data
+ *
+ * Return: >= 0 on success, negative error number on failure.
+ */
+int cros_ec_cmd_readmem(struct cros_ec_device *ec_dev, u8 offset, u8 size, void *dest)
+{
+ struct ec_params_read_memmap params = {};
+
+ if (!size)
+ return -EINVAL;
+
+ if (ec_dev->cmd_readmem)
+ return ec_dev->cmd_readmem(ec_dev, offset, size, dest);
+
+ params.offset = offset;
+ params.size = size;
+ return cros_ec_cmd(ec_dev, 0, EC_CMD_READ_MEMMAP,
+ ¶ms, sizeof(params), dest, size);
+}
+EXPORT_SYMBOL_GPL(cros_ec_cmd_readmem);
@@ -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.
*
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> --- drivers/platform/chrome/cros_ec_proto.c | 27 +++++++++++++++++++++++++++ include/linux/platform_data/cros_ec_proto.h | 2 ++ 2 files changed, 29 insertions(+)