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[RESEND v4 2/6] remoteproc: debugfs: Add ability to boot remote processor using debugfs

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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>
---
 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 9d30809..8113c18 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))
+		return count;
+
+	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

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[RESEND v4 0/6] remoteproc: Add driver for STMicroelectronics platforms Lee Jones <lee.jones@linaro.org> - 2015-11-24 14:20 +0100
  [RESEND v4 5/6] ARM: STiH407: Add nodes for RemoteProc Lee Jones <lee.jones@linaro.org> - 2015-11-24 14:20 +0100
  [RESEND v4 6/6] ARM: STiH407: Move over to using the 'reserved-memory' API for obtaining DMA memory Lee Jones <lee.jones@linaro.org> - 2015-11-24 14:20 +0100
  [RESEND v4 4/6] MAINTAINERS: Add ST's Remote Processor Driver to ARM/STI ARCHITECTURE Lee Jones <lee.jones@linaro.org> - 2015-11-24 14:20 +0100
  [RESEND v4 1/6] remoteproc: dt: Provide bindings for ST's Remote Processor Controller driver Lee Jones <lee.jones@linaro.org> - 2015-11-24 14:20 +0100
    Re: [RESEND v4 1/6] remoteproc: dt: Provide bindings for ST's Remote  Processor Controller driver Rob Herring <robh@kernel.org> - 2015-11-25 01:10 +0100
  [RESEND v4 3/6] remoteproc: Supply controller driver for ST's Remote Processors Lee Jones <lee.jones@linaro.org> - 2015-11-24 14:20 +0100
  [RESEND v4 2/6] remoteproc: debugfs: Add ability to boot remote processor using debugfs Lee Jones <lee.jones@linaro.org> - 2015-11-24 14:20 +0100
    Re: [RESEND v4 2/6] remoteproc: debugfs: Add ability to boot remote  processor using debugfs Bjorn Andersson <bjorn@kryo.se> - 2015-11-27 18:10 +0100
  Re: [RESEND v4 0/6] remoteproc: Add driver for STMicroelectronics platforms Ohad Ben-Cohen <ohad@wizery.com> - 2015-11-26 09:50 +0100
    Re: [RESEND v4 0/6] remoteproc: Add driver for STMicroelectronics  platforms Lee Jones <lee.jones@linaro.org> - 2015-11-26 10:20 +0100
      Re: [RESEND v4 0/6] remoteproc: Add driver for STMicroelectronics platforms Ohad Ben-Cohen <ohad@wizery.com> - 2015-11-26 10:40 +0100

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