From: Moritz Fischer <mdf@xxxxxxxxxx> The ChromeOS EC has mapped memory regions where things like temperature sensors and fan speed are stored. Provide access to those from the cros-ec mfd device. Signed-off-by: Moritz Fischer <mdf@xxxxxxxxxx> --- drivers/platform/chrome/cros_ec_proto.c | 55 +++++++++++++++++++++++++++++++++ include/linux/mfd/cros_ec.h | 39 +++++++++++++++++++++++ 2 files changed, 94 insertions(+) diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c index ed5dee7..28063de 100644 --- a/drivers/platform/chrome/cros_ec_proto.c +++ b/drivers/platform/chrome/cros_ec_proto.c @@ -494,3 +494,58 @@ int cros_ec_get_next_event(struct cros_ec_device *ec_dev) return get_keyboard_state_event(ec_dev); } EXPORT_SYMBOL(cros_ec_get_next_event); + +static int __cros_ec_read_mapped_mem(struct cros_ec_device *ec, uint8_t offset, + void *buf, size_t size) +{ + int ret; + struct ec_params_read_memmap *params; + struct cros_ec_command *msg; + + msg = kzalloc(sizeof(*msg) + max(sizeof(*params), size), GFP_KERNEL); + if (!msg) + return -ENOMEM; + + msg->version = 0; + msg->command = EC_CMD_READ_MEMMAP; + msg->insize = size; + msg->outsize = sizeof(*params); + + params = (struct ec_params_read_memmap *)msg->data; + params->offset = offset; + params->size = size; + + ret = cros_ec_cmd_xfer(ec, msg); + if (ret < 0 || msg->result != EC_RES_SUCCESS) { + dev_warn(ec->dev, "cannot read mapped reg: %d/%d\n", + ret, msg->result); + goto out_free; + } + + memcpy(buf, msg->data, size); + +out_free: + kfree(msg); + return ret; +} + +int cros_ec_read_mapped_mem32(struct cros_ec_device *ec, const uint8_t offset, + uint32_t *data) +{ + return __cros_ec_read_mapped_mem(ec, offset, data, sizeof(*data)); +} +EXPORT_SYMBOL_GPL(cros_ec_read_mapped_mem32); + +int cros_ec_read_mapped_mem16(struct cros_ec_device *ec, const uint8_t offset, + uint16_t *data) +{ + return __cros_ec_read_mapped_mem(ec, offset, data, sizeof(*data)); +} +EXPORT_SYMBOL_GPL(cros_ec_read_mapped_mem16); + +int cros_ec_read_mapped_mem8(struct cros_ec_device *ec, const uint8_t offset, + uint8_t *data) +{ + return __cros_ec_read_mapped_mem(ec, offset, data, sizeof(*data)); +} +EXPORT_SYMBOL_GPL(cros_ec_read_mapped_mem8); diff --git a/include/linux/mfd/cros_ec.h b/include/linux/mfd/cros_ec.h index b3d04de..c2de878 100644 --- a/include/linux/mfd/cros_ec.h +++ b/include/linux/mfd/cros_ec.h @@ -190,6 +190,45 @@ struct cros_ec_dev { }; /** + * cros_ec_read_mapped_mem8 - Read mapped memory in the ChromeOS EC + * + * This can be called by drivers to access the mapped memory in the EC + * + * @ec_dev: Device to read from + * @offset: Offset to read + * @data: Return data + * @return: 0 if Ok, -ve on error + */ +int cros_ec_read_mapped_mem8(struct cros_ec_device *ec, const uint8_t offset, + uint8_t *data); + +/** + * cros_ec_read_mapped_mem16 - Read mapped memory in the ChromeOS EC + * + * This can be called by drivers to access the mapped memory in the EC + * + * @ec_dev: Device to read from + * @offset: Offset to read + * @data: Return data + * @return: 0 if Ok, -ve on error + */ +int cros_ec_read_mapped_mem16(struct cros_ec_device *ec, const uint8_t offset, + uint16_t *data); + +/** + * cros_ec_read_mapped_mem32 - Read mapped memory in the ChromeOS EC + * + * This can be called by drivers to access the mapped memory in the EC + * + * @ec_dev: Device to read from + * @offset: Offset to read + * @data: Return data + * @return: 0 if Ok, -ve on error + */ +int cros_ec_read_mapped_mem32(struct cros_ec_device *ec, const uint8_t offset, + uint32_t *data); + +/** * cros_ec_suspend - Handle a suspend operation for the ChromeOS EC device * * This can be called by drivers to handle a suspend event. -- 2.7.4 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html