diff options
Diffstat (limited to 'drivers/mfd/wm831x-otp.c')
| -rw-r--r-- | drivers/mfd/wm831x-otp.c | 23 |
1 files changed, 6 insertions, 17 deletions
diff --git a/drivers/mfd/wm831x-otp.c b/drivers/mfd/wm831x-otp.c index b90f3e06b6c9..25f5d9fe33a1 100644 --- a/drivers/mfd/wm831x-otp.c +++ b/drivers/mfd/wm831x-otp.c @@ -1,15 +1,10 @@ +// SPDX-License-Identifier: GPL-2.0-or-later /* * wm831x-otp.c -- OTP for Wolfson WM831x PMICs * * Copyright 2009 Wolfson Microelectronics PLC. * * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> - * - * This program is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License as published by the - * Free Software Foundation; either version 2 of the License, or (at your - * option) any later version. - * */ #include <linux/kernel.h> @@ -43,27 +38,21 @@ static int wm831x_unique_id_read(struct wm831x *wm831x, char *id) return 0; } -static ssize_t wm831x_unique_id_show(struct device *dev, - struct device_attribute *attr, char *buf) +static ssize_t unique_id_show(struct device *dev, + struct device_attribute *attr, char *buf) { struct wm831x *wm831x = dev_get_drvdata(dev); - int i, rval; + int rval; char id[WM831X_UNIQUE_ID_LEN]; - ssize_t ret = 0; rval = wm831x_unique_id_read(wm831x, id); if (rval < 0) return 0; - for (i = 0; i < WM831X_UNIQUE_ID_LEN; i++) - ret += sprintf(&buf[ret], "%02x", buf[i]); - - ret += sprintf(&buf[ret], "\n"); - - return ret; + return sprintf(buf, "%*phN\n", WM831X_UNIQUE_ID_LEN, id); } -static DEVICE_ATTR(unique_id, 0444, wm831x_unique_id_show, NULL); +static DEVICE_ATTR_RO(unique_id); int wm831x_otp_init(struct wm831x *wm831x) { |