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Date: Wed, 13 Dec 2017 16:02:50 -0200
From: Mauro Carvalho Chehab <mchehab@...pensource.com>
To: <Yasunari.Takiguchi@...y.com>
Cc: <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
<linux-media@...r.kernel.org>, <tbird20d@...il.com>,
<frowand.list@...il.com>,
Masayuki Yamamoto <Masayuki.Yamamoto@...y.com>,
Hideki Nozawa <Hideki.Nozawa@...y.com>,
"Kota Yonezawa" <Kota.Yonezawa@...y.com>,
Toshihiko Matsumoto <Toshihiko.Matsumoto@...y.com>,
Satoshi Watanabe <Satoshi.C.Watanabe@...y.com>
Subject: Re: [PATCH v4 03/12] [media] cxd2880: Add common files for the
driver
Em Fri, 13 Oct 2017 15:02:59 +0900
<Yasunari.Takiguchi@...y.com> escreveu:
> From: Yasunari Takiguchi <Yasunari.Takiguchi@...y.com>
>
> These are common files for the driver for the
> Sony CXD2880 DVB-T2/T tuner + demodulator.
> These contains helper functions for the driver.
>
> Signed-off-by: Yasunari Takiguchi <Yasunari.Takiguchi@...y.com>
> Signed-off-by: Masayuki Yamamoto <Masayuki.Yamamoto@...y.com>
> Signed-off-by: Hideki Nozawa <Hideki.Nozawa@...y.com>
> Signed-off-by: Kota Yonezawa <Kota.Yonezawa@...y.com>
> Signed-off-by: Toshihiko Matsumoto <Toshihiko.Matsumoto@...y.com>
> Signed-off-by: Satoshi Watanabe <Satoshi.C.Watanabe@...y.com>
> ---
>
> [Change list]
> Changes in V4
> drivers/media/dvb-frontends/cxd2880/cxd2880_io.c
> -removed unnecessary initialization at variable declaration
> -modified how to write consecutive registers
>
> Changes in V3
> drivers/media/dvb-frontends/cxd2880/cxd2880.h
> -no change
> drivers/media/dvb-frontends/cxd2880/cxd2880_common.c
> -changed MASKUPPER/MASKLOWER with GENMASK
> drivers/media/dvb-frontends/cxd2880/cxd2880_common.h
> -removed definition NULL and SONY_SLEEP
> -changed CXD2880_SLEEP to usleep_range
> -changed cxd2880_atomic_set to atomic_set
> -removed cxd2880_atomic struct and cxd2880_atomic_read
> -changed stop-watch function
> -modified return code
> drivers/media/dvb-frontends/cxd2880/cxd2880_io.c
> -removed unnecessary cast
> -modified return code
> -changed hexadecimal code to lower case.
> drivers/media/dvb-frontends/cxd2880/cxd2880_io.h
> -modified return code
> drivers/media/dvb-frontends/cxd2880/cxd2880_stopwatch_port.c
> -changed CXD2880_SLEEP to usleep_range
> -changed stop-watch function
> -modified return code
> #drivers/media/dvb-frontends/cxd2880/cxd2880_stdlib.h
> -cxd2880_stdlib.h file was removed from V3.
>
> drivers/media/dvb-frontends/cxd2880/cxd2880.h | 46 +++++++++++
> .../media/dvb-frontends/cxd2880/cxd2880_common.c | 38 +++++++++
> .../media/dvb-frontends/cxd2880/cxd2880_common.h | 50 ++++++++++++
> drivers/media/dvb-frontends/cxd2880/cxd2880_io.c | 89 ++++++++++++++++++++++
> drivers/media/dvb-frontends/cxd2880/cxd2880_io.h | 71 +++++++++++++++++
> .../dvb-frontends/cxd2880/cxd2880_stopwatch_port.c | 60 +++++++++++++++
> 6 files changed, 354 insertions(+)
> create mode 100644 drivers/media/dvb-frontends/cxd2880/cxd2880.h
> create mode 100644 drivers/media/dvb-frontends/cxd2880/cxd2880_common.c
> create mode 100644 drivers/media/dvb-frontends/cxd2880/cxd2880_common.h
> create mode 100644 drivers/media/dvb-frontends/cxd2880/cxd2880_io.c
> create mode 100644 drivers/media/dvb-frontends/cxd2880/cxd2880_io.h
> create mode 100644 drivers/media/dvb-frontends/cxd2880/cxd2880_stopwatch_port.c
>
> diff --git a/drivers/media/dvb-frontends/cxd2880/cxd2880.h b/drivers/media/dvb-frontends/cxd2880/cxd2880.h
> new file mode 100644
> index 000000000000..281f9a784eb5
> --- /dev/null
> +++ b/drivers/media/dvb-frontends/cxd2880/cxd2880.h
> @@ -0,0 +1,46 @@
> +/*
> + * cxd2880.h
> + * Sony CXD2880 DVB-T2/T tuner + demodulator driver public definitions
> + *
> + * Copyright (C) 2016, 2017 Sony Semiconductor Solutions Corporation
> + *
> + * 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; version 2 of the License.
> + *
> + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
> + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
> + * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
> + * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
> + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
> + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
> + * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
> + * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
> + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
> + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
> + *
> + * You should have received a copy of the GNU General Public License along
> + * with this program; if not, see <http://www.gnu.org/licenses/>.
> + */
Same comment made on patch 2 applies to this one and to the entire
series, with regards to SPDX.
> +
> +#ifndef CXD2880_H
> +#define CXD2880_H
> +
> +struct cxd2880_config {
> + struct spi_device *spi;
> + struct mutex *spi_mutex; /* For SPI access exclusive control */
> +};
> +
> +#if IS_REACHABLE(CONFIG_DVB_CXD2880)
> +extern struct dvb_frontend *cxd2880_attach(struct dvb_frontend *fe,
> + struct cxd2880_config *cfg);
> +#else
> +static inline struct dvb_frontend *cxd2880_attach(struct dvb_frontend *fe,
> + struct cxd2880_config *cfg)
> +{
> + pr_warn("%s: driver disabled by Kconfig\n", __func__);
> + return NULL;
> +}
> +#endif /* CONFIG_DVB_CXD2880 */
> +
> +#endif /* CXD2880_H */
> diff --git a/drivers/media/dvb-frontends/cxd2880/cxd2880_common.c b/drivers/media/dvb-frontends/cxd2880/cxd2880_common.c
> new file mode 100644
> index 000000000000..ffaa140bb8cb
> --- /dev/null
> +++ b/drivers/media/dvb-frontends/cxd2880/cxd2880_common.c
> @@ -0,0 +1,38 @@
> +/*
> + * cxd2880_common.c
> + * Sony CXD2880 DVB-T2/T tuner + demodulator driver
> + * common functions
> + *
> + * Copyright (C) 2016, 2017 Sony Semiconductor Solutions Corporation
> + *
> + * 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; version 2 of the License.
> + *
> + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
> + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
> + * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
> + * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
> + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
> + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
> + * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
> + * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
> + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
> + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
> + *
> + * You should have received a copy of the GNU General Public License along
> + * with this program; if not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#include "cxd2880_common.h"
> +
> +int cxd2880_convert2s_complement(u32 value, u32 bitlen)
> +{
> + if ((bitlen == 0) || (bitlen >= 32))
> + return (int)value;
> +
> + if (value & (u32)(1 << (bitlen - 1)))
> + return (int)(GENMASK(31, bitlen) | value);
> + else
> + return (int)(GENMASK(bitlen - 1, 0) & value);
> +}
> diff --git a/drivers/media/dvb-frontends/cxd2880/cxd2880_common.h b/drivers/media/dvb-frontends/cxd2880/cxd2880_common.h
> new file mode 100644
> index 000000000000..cf6b800809ee
> --- /dev/null
> +++ b/drivers/media/dvb-frontends/cxd2880/cxd2880_common.h
> @@ -0,0 +1,50 @@
> +/*
> + * cxd2880_common.h
> + * Sony CXD2880 DVB-T2/T tuner + demodulator driver common definitions
> + *
> + * Copyright (C) 2016, 2017 Sony Semiconductor Solutions Corporation
> + *
> + * 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; version 2 of the License.
> + *
> + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
> + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
> + * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
> + * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
> + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
> + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
> + * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
> + * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
> + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
> + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
> + *
> + * You should have received a copy of the GNU General Public License along
> + * with this program; if not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#ifndef CXD2880_COMMON_H
> +#define CXD2880_COMMON_H
> +
> +#include <linux/types.h>
> +#include <linux/errno.h>
> +#include <linux/delay.h>
> +#include <linux/string.h>
> +
> +#define CXD2880_ARG_UNUSED(arg) ((void)(arg))
Huh??? Why this is needed?
> +
> +int cxd2880_convert2s_complement(u32 value, u32 bitlen);
> +
> +struct cxd2880_stopwatch {
> + unsigned long start_time;
> +};
> +
> +int cxd2880_stopwatch_start(struct cxd2880_stopwatch *stopwatch);
> +
> +int cxd2880_stopwatch_sleep(struct cxd2880_stopwatch *stopwatch,
> + u32 ms);
> +
> +int cxd2880_stopwatch_elapsed(struct cxd2880_stopwatch *stopwatch,
> + unsigned int *elapsed);
> +
> +#endif
> diff --git a/drivers/media/dvb-frontends/cxd2880/cxd2880_io.c b/drivers/media/dvb-frontends/cxd2880/cxd2880_io.c
> new file mode 100644
> index 000000000000..bdb0b7982401
> --- /dev/null
> +++ b/drivers/media/dvb-frontends/cxd2880/cxd2880_io.c
> @@ -0,0 +1,89 @@
> +/*
> + * cxd2880_io.c
> + * Sony CXD2880 DVB-T2/T tuner + demodulator driver
> + * register I/O interface functions
> + *
> + * Copyright (C) 2016, 2017 Sony Semiconductor Solutions Corporation
> + *
> + * 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; version 2 of the License.
> + *
> + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
> + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
> + * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
> + * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
> + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
> + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
> + * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
> + * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
> + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
> + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
> + *
> + * You should have received a copy of the GNU General Public License along
> + * with this program; if not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#include "cxd2880_io.h"
> +
> +int cxd2880_io_common_write_one_reg(struct cxd2880_io *io,
> + enum cxd2880_io_tgt tgt,
> + u8 sub_address, u8 data)
> +{
> + int ret;
> +
> + if (!io)
> + return -EINVAL;
> +
> + ret = io->write_regs(io, tgt, sub_address, &data, 1);
> +
> + return ret;
> +}
> +
> +int cxd2880_io_set_reg_bits(struct cxd2880_io *io,
> + enum cxd2880_io_tgt tgt,
> + u8 sub_address, u8 data, u8 mask)
> +{
> + int ret;
> +
> + if (!io)
> + return -EINVAL;
> +
> + if (mask == 0x00)
> + return 0;
> +
> + if (mask != 0xff) {
> + u8 rdata = 0x00;
> +
> + ret = io->read_regs(io, tgt, sub_address, &rdata, 1);
> + if (ret)
> + return ret;
> +
> + data = (data & mask) | (rdata & (mask ^ 0xff));
> + }
> +
> + ret = io->write_reg(io, tgt, sub_address, data);
> +
> + return ret;
> +}
> +
> +int cxd2880_io_write_multi_regs(struct cxd2880_io *io,
> + enum cxd2880_io_tgt tgt,
> + const struct cxd2880_reg_value reg_value[],
> + u8 size)
> +{
> + int ret;
> + int i;
> +
> + if (!io)
> + return -EINVAL;
> +
> + for (i = 0; i < size ; i++) {
> + ret = io->write_reg(io, tgt, reg_value[i].addr,
> + reg_value[i].value);
> + if (ret)
> + return ret;
> + }
> +
> + return 0;
> +}
> diff --git a/drivers/media/dvb-frontends/cxd2880/cxd2880_io.h b/drivers/media/dvb-frontends/cxd2880/cxd2880_io.h
> new file mode 100644
> index 000000000000..f7aee6c6480e
> --- /dev/null
> +++ b/drivers/media/dvb-frontends/cxd2880/cxd2880_io.h
> @@ -0,0 +1,71 @@
> +/*
> + * cxd2880_io.h
> + * Sony CXD2880 DVB-T2/T tuner + demodulator driver
> + * register I/O interface definitions
> + *
> + * Copyright (C) 2016, 2017 Sony Semiconductor Solutions Corporation
> + *
> + * 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; version 2 of the License.
> + *
> + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
> + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
> + * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
> + * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
> + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
> + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
> + * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
> + * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
> + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
> + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
> + *
> + * You should have received a copy of the GNU General Public License along
> + * with this program; if not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#ifndef CXD2880_IO_H
> +#define CXD2880_IO_H
> +
> +#include "cxd2880_common.h"
> +
> +enum cxd2880_io_tgt {
> + CXD2880_IO_TGT_SYS,
> + CXD2880_IO_TGT_DMD
> +};
> +
> +struct cxd2880_reg_value {
> + u8 addr;
> + u8 value;
> +};
> +
> +struct cxd2880_io {
> + int (*read_regs)(struct cxd2880_io *io,
> + enum cxd2880_io_tgt tgt, u8 sub_address,
> + u8 *data, u32 size);
> + int (*write_regs)(struct cxd2880_io *io,
> + enum cxd2880_io_tgt tgt, u8 sub_address,
> + const u8 *data, u32 size);
> + int (*write_reg)(struct cxd2880_io *io,
> + enum cxd2880_io_tgt tgt, u8 sub_address,
> + u8 data);
> + void *if_object;
> + u8 i2c_address_sys;
> + u8 i2c_address_demod;
> + u8 slave_select;
> + void *user;
> +};
> +
> +int cxd2880_io_common_write_one_reg(struct cxd2880_io *io,
> + enum cxd2880_io_tgt tgt,
> + u8 sub_address, u8 data);
> +
> +int cxd2880_io_set_reg_bits(struct cxd2880_io *io,
> + enum cxd2880_io_tgt tgt,
> + u8 sub_address, u8 data, u8 mask);
> +
> +int cxd2880_io_write_multi_regs(struct cxd2880_io *io,
> + enum cxd2880_io_tgt tgt,
> + const struct cxd2880_reg_value reg_value[],
> + u8 size);
> +#endif
> diff --git a/drivers/media/dvb-frontends/cxd2880/cxd2880_stopwatch_port.c b/drivers/media/dvb-frontends/cxd2880/cxd2880_stopwatch_port.c
> new file mode 100644
> index 000000000000..a4a1e29de653
> --- /dev/null
> +++ b/drivers/media/dvb-frontends/cxd2880/cxd2880_stopwatch_port.c
> @@ -0,0 +1,60 @@
> +/*
> + * cxd2880_stopwatch_port.c
> + * Sony CXD2880 DVB-T2/T tuner + demodulator driver
> + * time measurement functions
> + *
> + * Copyright (C) 2016, 2017 Sony Semiconductor Solutions Corporation
> + *
> + * 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; version 2 of the License.
> + *
> + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
> + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
> + * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
> + * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
> + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
> + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
> + * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
> + * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
> + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
> + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
> + *
> + * You should have received a copy of the GNU General Public License along
> + * with this program; if not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#include <linux/jiffies.h>
> +
> +#include "cxd2880_common.h"
> +
> +int cxd2880_stopwatch_start(struct cxd2880_stopwatch *stopwatch)
> +{
> + if (!stopwatch)
> + return -EINVAL;
> +
> + stopwatch->start_time = jiffies;
> +
> + return 0;
> +}
> +
> +int cxd2880_stopwatch_sleep(struct cxd2880_stopwatch *stopwatch,
> + u32 ms)
> +{
> + if (!stopwatch)
> + return -EINVAL;
> + CXD2880_ARG_UNUSED(*stopwatch);
Huh? This macro does nothing. If this argument is not needed, then
just don't declare it...
> + usleep_range(ms * 10000, ms * 10000 + 1000);
> +
> + return 0;
> +}
... at the end, this code evaluates to just:
usleep_range(ms * 10000, ms * 10000 + 1000);
Why don't you just use usleep_range() directly, instead of adding
a function that just encapsulates it?
> +
> +int cxd2880_stopwatch_elapsed(struct cxd2880_stopwatch *stopwatch,
> + unsigned int *elapsed)
> +{
> + if (!stopwatch || !elapsed)
> + return -EINVAL;
> + *elapsed = jiffies_to_msecs(jiffies - stopwatch->start_time);
> +
> + return 0;
> +}
It seems that this entire C file is just adding another layer on the
top of jiffies. Please, don't do that, as it makes a lot harder to
understand what you're trying to do.
Thanks,
Mauro
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