diff options
Diffstat (limited to 'drivers/mfd/cros_ec.c')
| -rw-r--r-- | drivers/mfd/cros_ec.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/drivers/mfd/cros_ec.c b/drivers/mfd/cros_ec.c index 4873f9c5045..fc0c81ef04f 100644 --- a/drivers/mfd/cros_ec.c +++ b/drivers/mfd/cros_ec.c @@ -23,6 +23,9 @@ #include <linux/mfd/core.h> #include <linux/mfd/cros_ec.h> #include <linux/mfd/cros_ec_commands.h> +#include <linux/delay.h> + +#define EC_COMMAND_RETRIES 50 int cros_ec_prepare_tx(struct cros_ec_device *ec_dev, struct cros_ec_command *msg) @@ -62,6 +65,49 @@ int cros_ec_check_result(struct cros_ec_device *ec_dev, } EXPORT_SYMBOL(cros_ec_check_result); +int cros_ec_cmd_xfer(struct cros_ec_device *ec_dev, + struct cros_ec_command *msg) +{ + int ret; + + mutex_lock(&ec_dev->lock); + ret = ec_dev->cmd_xfer(ec_dev, msg); + if (msg->result == EC_RES_IN_PROGRESS) { + int i; + struct cros_ec_command status_msg; + struct ec_response_get_comms_status status; + + status_msg.version = 0; + status_msg.command = EC_CMD_GET_COMMS_STATUS; + status_msg.outdata = NULL; + status_msg.outsize = 0; + status_msg.indata = (uint8_t *)&status; + status_msg.insize = sizeof(status); + + /* + * Query the EC's status until it's no longer busy or + * we encounter an error. + */ + for (i = 0; i < EC_COMMAND_RETRIES; i++) { + usleep_range(10000, 11000); + + ret = ec_dev->cmd_xfer(ec_dev, &status_msg); + if (ret < 0) + break; + + msg->result = status_msg.result; + if (status_msg.result != EC_RES_SUCCESS) + break; + if (!(status.flags & EC_COMMS_STATUS_PROCESSING)) + break; + } + } + mutex_unlock(&ec_dev->lock); + + return ret; +} +EXPORT_SYMBOL(cros_ec_cmd_xfer); + static const struct mfd_cell cros_devs[] = { { .name = "cros-ec-keyb", @@ -91,6 +137,8 @@ int cros_ec_register(struct cros_ec_device *ec_dev) return -ENOMEM; } + mutex_init(&ec_dev->lock); + err = mfd_add_devices(dev, 0, cros_devs, ARRAY_SIZE(cros_devs), NULL, ec_dev->irq, NULL); |