[PATCH v5 3/7] remoteproc: debugfs: Add ability to boot remote processor using debugfs
From: Lee Jones <hidden>
Date: 2016-01-12 12:49:10
Also in:
linux-arm-kernel, lkml
Subsystem:
remote processor (remoteproc) subsystem, the rest · Maintainers:
Bjorn Andersson, Mathieu Poirier, Linus Torvalds
This functionality is especially useful during the testing phase. When used in conjunction with Mailbox's Test Framework we can trivially conduct end-to-end testing i.e. boot co-processor, send and receive messages to the co-processor, then shut it down again (repeat as required). Signed-off-by: Ludovic Barre <redacted> Signed-off-by: Lee Jones <redacted> --- drivers/remoteproc/remoteproc_debugfs.c | 34 +++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+)
diff --git a/drivers/remoteproc/remoteproc_debugfs.c b/drivers/remoteproc/remoteproc_debugfs.c
index f63464c..2f2ac33 100644
--- a/drivers/remoteproc/remoteproc_debugfs.c
+++ b/drivers/remoteproc/remoteproc_debugfs.c@@ -88,8 +88,42 @@ static ssize_t rproc_state_read(struct file *filp, char __user *userbuf, return simple_read_from_buffer(userbuf, count, ppos, buf, i); } +static ssize_t rproc_state_write(struct file *filp, const char __user *userbuf, + size_t count, loff_t *ppos) +{ + struct rproc *rproc = filp->private_data; + char buf[10]; + int ret; + + if (count > sizeof(buf) || count <= 0) + return -EINVAL; + + ret = copy_from_user(buf, userbuf, count); + if (ret) + return -EFAULT; + + if (buf[count - 1] == '\n') + buf[count - 1] = '\0'; + + if (!strncmp(buf, "start", count)) { + ret = rproc_boot(rproc); + if (ret) { + dev_err(&rproc->dev, "Boot failed: %d\n", ret); + return ret; + } + } else if (!strncmp(buf, "stop", count)) { + rproc_shutdown(rproc); + } else { + dev_err(&rproc->dev, "Unrecognised option: %s\n", buf); + return -EINVAL; + } + + return count; +} + static const struct file_operations rproc_state_ops = { .read = rproc_state_read, + .write = rproc_state_write, .open = simple_open, .llseek = generic_file_llseek, };
--
1.9.1