From mboxrd@z Thu Jan 1 00:00:00 1970 From: lee.jones@linaro.org (Lee Jones) Date: Wed, 2 Sep 2015 16:38:07 +0100 Subject: [PATCH v3 4/6] remoteproc: debugfs: Add ability to boot remote processor using debugfs In-Reply-To: <1441208289-17330-1-git-send-email-lee.jones@linaro.org> References: <1441208289-17330-1-git-send-email-lee.jones@linaro.org> Message-ID: <1441208289-17330-5-git-send-email-lee.jones@linaro.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.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 | 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