From: Hans Verkuil <hans.verkuil@xxxxxxxxx>
Add two new ops (error_inj_show and error_inj_parse_line) to support
error injection functionality for CEC adapters. If both are present,
then the core will add a new error-inj debugfs file that can be used
to see the current error injection commands and to set error injection
commands.
Signed-off-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
---
drivers/media/cec/cec-core.c | 58 ++++++++++++++++++++++++++++++++++++++++++++
include/media/cec.h | 5 ++++
2 files changed, 63 insertions(+)
diff --git a/drivers/media/cec/cec-core.c b/drivers/media/cec/cec-core.c
index e47ea22b3c23..ea3eccfdba15 100644
--- a/drivers/media/cec/cec-core.c
+++ b/drivers/media/cec/cec-core.c
@@ -195,6 +195,55 @@ void cec_register_cec_notifier(struct cec_adapter *adap,
EXPORT_SYMBOL_GPL(cec_register_cec_notifier);
#endif
+#ifdef CONFIG_DEBUG_FS
+static ssize_t cec_error_inj_write(struct file *file,
+ const char __user *ubuf, size_t count, loff_t *ppos)
+{
+ struct seq_file *sf = file->private_data;
+ struct cec_adapter *adap = sf->private;
+ char *buf;
+ char *line;
+ char *p;
+
+ buf = memdup_user_nul(ubuf, min_t(size_t, PAGE_SIZE, count));
+ if (IS_ERR(buf))
+ return PTR_ERR(buf);
+ p = buf;
+ while (p && *p && count >= 0) {
+ p = skip_spaces(p);
+ line = strsep(&p, "\n");
+ if (!*line || *line == '#')
+ continue;
+ if (!adap->ops->error_inj_parse_line(adap, line)) {
+ count = -EINVAL;
+ break;
+ }
+ }
+ kfree(buf);
+ return count;
+}
+
+static int cec_error_inj_show(struct seq_file *sf, void *unused)
+{
+ struct cec_adapter *adap = sf->private;
+
+ return adap->ops->error_inj_show(adap, sf);
+}
+
+static int cec_error_inj_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, cec_error_inj_show, inode->i_private);
+}
+
+static const struct file_operations cec_error_inj_fops = {
+ .open = cec_error_inj_open,
+ .write = cec_error_inj_write,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+#endif
+
struct cec_adapter *cec_allocate_adapter(const struct cec_adap_ops *ops,
void *priv, const char *name, u32 caps,
u8 available_las)
@@ -334,7 +383,16 @@ int cec_register_adapter(struct cec_adapter *adap,
pr_warn("cec-%s: Failed to create status file\n", adap->name);
debugfs_remove_recursive(adap->cec_dir);
adap->cec_dir = NULL;
+ return 0;
}
+ if (!adap->ops->error_inj_show || !adap->ops->error_inj_parse_line)
+ return 0;
+ adap->error_inj_file = debugfs_create_file("error-inj", 0644,
+ adap->cec_dir, adap,
+ &cec_error_inj_fops);
+ if (IS_ERR_OR_NULL(adap->error_inj_file))
+ pr_warn("cec-%s: Failed to create error-inj file\n",
+ adap->name);
#endif
return 0;
}
diff --git a/include/media/cec.h b/include/media/cec.h
index 9afba9b558df..41df048efc55 100644
--- a/include/media/cec.h
+++ b/include/media/cec.h
@@ -117,6 +117,10 @@ struct cec_adap_ops {
void (*adap_status)(struct cec_adapter *adap, struct seq_file *file);
void (*adap_free)(struct cec_adapter *adap);
+ /* Error injection callbacks */
+ int (*error_inj_show)(struct cec_adapter *adap, struct seq_file *sf);
+ bool (*error_inj_parse_line)(struct cec_adapter *adap, char *line);
+
/* High-level CEC message callback */
int (*received)(struct cec_adapter *adap, struct cec_msg *msg);
};
@@ -189,6 +193,7 @@ struct cec_adapter {
struct dentry *cec_dir;
struct dentry *status_file;
+ struct dentry *error_inj_file;
u16 phys_addrs[15];
u32 sequence;
--
2.16.1
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