This patch provides the aforementioned procfs file that lists the default firmware paths that are used during firmware lookup.
The file contains a white space separated list of paths. There will be another patch on top of this that adds the functionality to modify the paths at runtime. Signed-off-by: Dimitris Papastamos <[email protected]> --- drivers/base/firmware_class.c | 55 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 55 insertions(+) diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c index d76152b..322fff3 100644 --- a/drivers/base/firmware_class.c +++ b/drivers/base/firmware_class.c @@ -27,6 +27,8 @@ #include <linux/pm.h> #include <linux/suspend.h> #include <linux/syscore_ops.h> +#include <linux/proc_fs.h> +#include <linux/seq_file.h> #include <generated/utsrelease.h> @@ -1468,6 +1470,56 @@ err_fwp_alloc: return -ENOMEM; } +static void *fw_path_seq_start(struct seq_file *seq, loff_t *pos) +{ + return seq_list_start_head(&fw_path_list, *pos); +} + +static void *fw_path_seq_next(struct seq_file *seq, void *v, loff_t *pos) +{ + return seq_list_next(v, &fw_path_list, pos); +} + +static int fw_path_seq_show(struct seq_file *seq, void *v) +{ + const struct fw_path_rec *fwp; + struct list_head *l = v; + + if (l == &fw_path_list) + return 0; + fwp = list_entry(v, struct fw_path_rec, list); + seq_puts(seq, fwp->name); + if (l->next != &fw_path_list) + seq_putc(seq, ' '); + else + seq_putc(seq, '\n'); + return 0; +} + +static void fw_path_seq_stop(struct seq_file *seq, void *v) +{ +} + +static const struct seq_operations fw_path_ops = { + .start = fw_path_seq_start, + .next = fw_path_seq_next, + .stop = fw_path_seq_stop, + .show = fw_path_seq_show, +}; + +static int fw_path_open(struct inode *inode, struct file *file) +{ + return seq_open(file, &fw_path_ops); +} + +static const struct file_operations fw_path_seq_fops = { + .owner = THIS_MODULE, + .open = fw_path_open, + .read = seq_read, + .llseek = seq_lseek, + .release = seq_release, +}; + static void __init fw_cache_init(void) { spin_lock_init(&fw_cache.lock); @@ -1501,6 +1553,8 @@ static int __init firmware_class_init(void) return ret; } + proc_create("firmware_path", S_IRUGO, NULL, &fw_path_seq_fops); + return class_register(&firmware_class); } @@ -1510,6 +1564,7 @@ static void __exit firmware_class_exit(void) unregister_syscore_ops(&fw_syscore_ops); unregister_pm_notifier(&fw_cache.pm_notify); #endif + remove_proc_entry("firmware_path", NULL); fw_free_path_list(); class_unregister(&firmware_class); } -- 1.8.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
