diff options
Diffstat (limited to 'drivers/platform')
| -rw-r--r-- | drivers/platform/chrome/cros_ec_lightbar.c | 69 |
1 files changed, 68 insertions, 1 deletions
diff --git a/drivers/platform/chrome/cros_ec_lightbar.c b/drivers/platform/chrome/cros_ec_lightbar.c index 8df3d447cacf..26675059707e 100644 --- a/drivers/platform/chrome/cros_ec_lightbar.c +++ b/drivers/platform/chrome/cros_ec_lightbar.c @@ -295,7 +295,8 @@ exit: static char const *seqname[] = { "ERROR", "S5", "S3", "S0", "S5S3", "S3S0", - "S0S3", "S3S5", "STOP", "RUN", "PULSE", "TEST", "KONAMI", + "S0S3", "S3S5", "STOP", "RUN", "KONAMI", + "TAP", "PROGRAM", }; static ssize_t sequence_show(struct device *dev, @@ -390,6 +391,69 @@ exit: return ret; } +static ssize_t program_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + int extra_bytes, max_size, ret; + struct ec_params_lightbar *param; + struct cros_ec_command *msg; + struct cros_ec_dev *ec = container_of(dev, struct cros_ec_dev, + class_dev); + + /* + * We might need to reject the program for size reasons. The EC + * enforces a maximum program size, but we also don't want to try + * and send a program that is too big for the protocol. In order + * to ensure the latter, we also need to ensure we have extra bytes + * to represent the rest of the packet. + */ + extra_bytes = sizeof(*param) - sizeof(param->set_program.data); + max_size = min(EC_LB_PROG_LEN, ec->ec_dev->max_request - extra_bytes); + if (count > max_size) { + dev_err(dev, "Program is %u bytes, too long to send (max: %u)", + (unsigned int)count, max_size); + + return -EINVAL; + } + + msg = alloc_lightbar_cmd_msg(ec); + if (!msg) + return -ENOMEM; + + ret = lb_throttle(); + if (ret) + goto exit; + + dev_info(dev, "Copying %zu byte program to EC", count); + + param = (struct ec_params_lightbar *)msg->data; + param->cmd = LIGHTBAR_CMD_SET_PROGRAM; + + param->set_program.size = count; + memcpy(param->set_program.data, buf, count); + + /* + * We need to set the message size manually or else it will use + * EC_LB_PROG_LEN. This might be too long, and the program + * is unlikely to use all of the space. + */ + msg->outsize = count + extra_bytes; + + ret = cros_ec_cmd_xfer(ec->ec_dev, msg); + if (ret < 0) + goto exit; + if (msg->result != EC_RES_SUCCESS) { + ret = -EINVAL; + goto exit; + } + + ret = count; +exit: + kfree(msg); + + return ret; +} + /* Module initialization */ static DEVICE_ATTR_RW(interval_msec); @@ -397,12 +461,15 @@ static DEVICE_ATTR_RO(version); static DEVICE_ATTR_WO(brightness); static DEVICE_ATTR_WO(led_rgb); static DEVICE_ATTR_RW(sequence); +static DEVICE_ATTR_WO(program); + static struct attribute *__lb_cmds_attrs[] = { &dev_attr_interval_msec.attr, &dev_attr_version.attr, &dev_attr_brightness.attr, &dev_attr_led_rgb.attr, &dev_attr_sequence.attr, + &dev_attr_program.attr, NULL, }; |