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remoteproc: debugfs: Add ability to boot remote processor using debugfs 

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 <ludovic.barre@st.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
This commit is contained in:
Lee Jones 2016-01-12 12:46:17 +00:00 committed by Bjorn Andersson
parent 6cb0e0f6a4
commit 69e50479bd
1 changed files with 34 additions and 0 deletions
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34
drivers/remoteproc/remoteproc_debugfs.c
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@ -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,
};