diff options
Diffstat (limited to 'drivers/media/tuners/tda18218.c')
| -rw-r--r-- | drivers/media/tuners/tda18218.c | 51 |
1 files changed, 27 insertions, 24 deletions
diff --git a/drivers/media/tuners/tda18218.c b/drivers/media/tuners/tda18218.c index 2d31aeb6b088..7d8d84dcb245 100644 --- a/drivers/media/tuners/tda18218.c +++ b/drivers/media/tuners/tda18218.c @@ -1,30 +1,20 @@ +// SPDX-License-Identifier: GPL-2.0-or-later /* * NXP TDA18218HN silicon tuner driver * * Copyright (C) 2010 Antti Palosaari <crope@iki.fi> - * - * 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. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include "tda18218_priv.h" +/* Max transfer size done by I2C transfer functions */ +#define MAX_XFER_SIZE 64 + /* write multiple registers */ static int tda18218_wr_regs(struct tda18218_priv *priv, u8 reg, u8 *val, u8 len) { int ret = 0, len2, remaining; - u8 buf[1 + len]; + u8 buf[MAX_XFER_SIZE]; struct i2c_msg msg[1] = { { .addr = priv->cfg->i2c_address, @@ -33,6 +23,13 @@ static int tda18218_wr_regs(struct tda18218_priv *priv, u8 reg, u8 *val, u8 len) } }; + if (1 + len > sizeof(buf)) { + dev_warn(&priv->i2c->dev, + "%s: i2c wr reg=%04x: len=%d is too big!\n", + KBUILD_MODNAME, reg, len); + return -EINVAL; + } + for (remaining = len; remaining > 0; remaining -= (priv->cfg->i2c_wr_max - 1)) { len2 = remaining; @@ -63,7 +60,7 @@ static int tda18218_wr_regs(struct tda18218_priv *priv, u8 reg, u8 *val, u8 len) static int tda18218_rd_regs(struct tda18218_priv *priv, u8 reg, u8 *val, u8 len) { int ret; - u8 buf[reg+len]; /* we must start read always from reg 0x00 */ + u8 buf[MAX_XFER_SIZE]; /* we must start read always from reg 0x00 */ struct i2c_msg msg[2] = { { .addr = priv->cfg->i2c_address, @@ -73,11 +70,18 @@ static int tda18218_rd_regs(struct tda18218_priv *priv, u8 reg, u8 *val, u8 len) }, { .addr = priv->cfg->i2c_address, .flags = I2C_M_RD, - .len = sizeof(buf), + .len = reg + len, .buf = buf, } }; + if (reg + len > sizeof(buf)) { + dev_warn(&priv->i2c->dev, + "%s: i2c wr reg=%04x: len=%d is too big!\n", + KBUILD_MODNAME, reg, len); + return -EINVAL; + } + ret = i2c_transfer(priv->i2c, msg, 2); if (ret == 2) { memcpy(val, &buf[reg], len); @@ -248,20 +252,19 @@ static int tda18218_init(struct dvb_frontend *fe) return ret; } -static int tda18218_release(struct dvb_frontend *fe) +static void tda18218_release(struct dvb_frontend *fe) { kfree(fe->tuner_priv); fe->tuner_priv = NULL; - return 0; } static const struct dvb_tuner_ops tda18218_tuner_ops = { .info = { - .name = "NXP TDA18218", + .name = "NXP TDA18218", - .frequency_min = 174000000, - .frequency_max = 864000000, - .frequency_step = 1000, + .frequency_min_hz = 174 * MHz, + .frequency_max_hz = 864 * MHz, + .frequency_step_hz = 1 * kHz, }, .release = tda18218_release, @@ -333,7 +336,7 @@ struct dvb_frontend *tda18218_attach(struct dvb_frontend *fe, return fe; } -EXPORT_SYMBOL(tda18218_attach); +EXPORT_SYMBOL_GPL(tda18218_attach); MODULE_DESCRIPTION("NXP TDA18218HN silicon tuner driver"); MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>"); |