diff options
Diffstat (limited to 'drivers/media/tuners/r820t.c')
| -rw-r--r-- | drivers/media/tuners/r820t.c | 69 |
1 files changed, 30 insertions, 39 deletions
diff --git a/drivers/media/tuners/r820t.c b/drivers/media/tuners/r820t.c index ba80376a3b86..bc9299059f48 100644 --- a/drivers/media/tuners/r820t.c +++ b/drivers/media/tuners/r820t.c @@ -1,36 +1,24 @@ -/* - * Rafael Micro R820T driver - * - * Copyright (C) 2013 Mauro Carvalho Chehab - * - * This driver was written from scratch, based on an existing driver - * that it is part of rtl-sdr git tree, released under GPLv2: - * https://groups.google.com/forum/#!topic/ultra-cheap-sdr/Y3rBEOFtHug - * https://github.com/n1gp/gr-baz - * - * From what I understood from the threads, the original driver was converted - * to userspace from a Realtek tree. I couldn't find the original tree. - * However, the original driver look awkward on my eyes. So, I decided to - * write a new version from it from the scratch, while trying to reproduce - * everything found there. - * - * TODO: - * After locking, the original driver seems to have some routines to - * improve reception. This was not implemented here yet. - * - * RF Gain set/get is not implemented. - * - * 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. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - */ +// SPDX-License-Identifier: GPL-2.0 +// Rafael Micro R820T driver +// +// Copyright (C) 2013 Mauro Carvalho Chehab +// +// This driver was written from scratch, based on an existing driver +// that it is part of rtl-sdr git tree, released under GPLv2: +// https://groups.google.com/forum/#!topic/ultra-cheap-sdr/Y3rBEOFtHug +// https://github.com/n1gp/gr-baz +// +// From what I understood from the threads, the original driver was converted +// to userspace from a Realtek tree. I couldn't find the original tree. +// However, the original driver look awkward on my eyes. So, I decided to +// write a new version from it from the scratch, while trying to reproduce +// everything found there. +// +// TODO: +// After locking, the original driver seems to have some routines to +// improve reception. This was not implemented here yet. +// +// RF Gain set/get is not implemented. #include <linux/videodev2.h> #include <linux/mutex.h> @@ -396,9 +384,11 @@ static int r820t_write(struct r820t_priv *priv, u8 reg, const u8 *val, return 0; } -static int r820t_write_reg(struct r820t_priv *priv, u8 reg, u8 val) +static inline int r820t_write_reg(struct r820t_priv *priv, u8 reg, u8 val) { - return r820t_write(priv, reg, &val, 1); + u8 tmp = val; /* work around GCC PR81715 with asan-stack=1 */ + + return r820t_write(priv, reg, &tmp, 1); } static int r820t_read_cache_reg(struct r820t_priv *priv, int reg) @@ -411,17 +401,18 @@ static int r820t_read_cache_reg(struct r820t_priv *priv, int reg) return -EINVAL; } -static int r820t_write_reg_mask(struct r820t_priv *priv, u8 reg, u8 val, +static inline int r820t_write_reg_mask(struct r820t_priv *priv, u8 reg, u8 val, u8 bit_mask) { + u8 tmp = val; int rc = r820t_read_cache_reg(priv, reg); if (rc < 0) return rc; - val = (rc & ~bit_mask) | (val & bit_mask); + tmp = (rc & ~bit_mask) | (tmp & bit_mask); - return r820t_write(priv, reg, &val, 1); + return r820t_write(priv, reg, &tmp, 1); } static int r820t_read(struct r820t_priv *priv, u8 reg, u8 *val, int len) @@ -2388,4 +2379,4 @@ EXPORT_SYMBOL_GPL(r820t_attach); MODULE_DESCRIPTION("Rafael Micro r820t silicon tuner driver"); MODULE_AUTHOR("Mauro Carvalho Chehab"); -MODULE_LICENSE("GPL"); +MODULE_LICENSE("GPL v2"); |