From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lee Jones Subject: [PATCH v2 4/4] remoteproc: debugfs: Add ability to boot remote processor using debugfs Date: Fri, 28 Aug 2015 11:31:51 +0100 Message-ID: <1440757911-9120-5-git-send-email-lee.jones@linaro.org> References: <1440757911-9120-1-git-send-email-lee.jones@linaro.org> Return-path: In-Reply-To: <1440757911-9120-1-git-send-email-lee.jones@linaro.org> Sender: linux-kernel-owner@vger.kernel.org To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Cc: kernel@stlinux.com, ohad@wizery.com, devicetree@vger.kernel.org, Nathan_Lynch@mentor.com, Lee Jones , Ludovic Barre List-Id: devicetree@vger.kernel.org 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 Signed-off-by: Lee Jones --- drivers/remoteproc/remoteproc_debugfs.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) diff --git a/drivers/remoteproc/remoteproc_debugfs.c b/drivers/remoteproc/remoteproc_debugfs.c index 9d30809..464470d 100644 --- a/drivers/remoteproc/remoteproc_debugfs.c +++ b/drivers/remoteproc/remoteproc_debugfs.c @@ -88,8 +88,37 @@ 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[2]; + int ret; + + ret = copy_from_user(buf, userbuf, 1); + if (ret) + return -EFAULT; + + switch (buf[0]) { + case '0': + rproc_shutdown(rproc); + break; + case '1': + ret = rproc_boot(rproc); + if (ret) + dev_warn(&rproc->dev, "Boot failed: %d\n", ret); + break; + default: + dev_err(&rproc->dev, "Unrecognised option: %x\n", buf[1]); + 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