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>
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@ -88,8 +88,42 @@ static ssize_t rproc_state_read(struct file *filp, char __user *userbuf,
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return simple_read_from_buffer(userbuf, count, ppos, buf, i);
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}
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static ssize_t rproc_state_write(struct file *filp, const char __user *userbuf,
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size_t count, loff_t *ppos)
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{
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struct rproc *rproc = filp->private_data;
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char buf[10];
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int ret;
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if (count > sizeof(buf) || count <= 0)
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return -EINVAL;
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ret = copy_from_user(buf, userbuf, count);
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if (ret)
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return -EFAULT;
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if (buf[count - 1] == '\n')
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buf[count - 1] = '\0';
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if (!strncmp(buf, "start", count)) {
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ret = rproc_boot(rproc);
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if (ret) {
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dev_err(&rproc->dev, "Boot failed: %d\n", ret);
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return ret;
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}
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} else if (!strncmp(buf, "stop", count)) {
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rproc_shutdown(rproc);
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} else {
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dev_err(&rproc->dev, "Unrecognised option: %s\n", buf);
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return -EINVAL;
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}
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return count;
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}
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static const struct file_operations rproc_state_ops = {
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.read = rproc_state_read,
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.write = rproc_state_write,
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.open = simple_open,
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.llseek = generic_file_llseek,
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};
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