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Date: Thu, 25 Apr 2013 22:33:20 +0200
From: Jon Arne Jørgensen <jonarne@...arne.no>
To: Mauro Carvalho Chehab <mchehab@...hat.com>
Cc: Jon Arne Jørgensen <jonarne@...arne.no>,
linux-media@...r.kernel.org, jonjon.arnearne@...il.com,
linux-kernel@...r.kernel.org, hverkuil@...all.nl,
elezegarcia@...il.com, mkrufky@...uxtv.org, bjorn@...k.no
Subject: Re: [RFC V2 1/3] [smi2021] Add gm7113c chip to the saa7115 driver
On Thu, Apr 25, 2013 at 05:13:28PM -0300, Mauro Carvalho Chehab wrote:
> Em Thu, 25 Apr 2013 21:10:18 +0200
> Jon Arne Jørgensen <jonarne@...arne.no> escreveu:
>
> > The somagic device uses the gm7113c chip to digitize analog video,
> > this is a clone of the saa7113 chip.
> >
> > The gm7113c can't be identified over i2c, so I can't rely on
> > saa7115 autodetection.
> >
> > Signed-off-by: Jon Arne Jørgensen <jonarne@...arne.no>
> > ---
> > drivers/media/i2c/saa7115.c | 61 ++++++++++++++++++++++++++++++++++-------
> > include/media/v4l2-chip-ident.h | 3 ++
> > 2 files changed, 54 insertions(+), 10 deletions(-)
> >
> > diff --git a/drivers/media/i2c/saa7115.c b/drivers/media/i2c/saa7115.c
> > index 6b6788c..e93b50a 100644
> > --- a/drivers/media/i2c/saa7115.c
> > +++ b/drivers/media/i2c/saa7115.c
> > @@ -54,7 +54,7 @@
> >
> > MODULE_DESCRIPTION("Philips SAA7111/SAA7113/SAA7114/SAA7115/SAA7118 video decoder driver");
> > MODULE_AUTHOR( "Maxim Yevtyushkin, Kevin Thayer, Chris Kennedy, "
> > - "Hans Verkuil, Mauro Carvalho Chehab");
> > + "Hans Verkuil, Mauro Carvalho Chehab, Jon Arne Jørgensen");
>
> Hi Jon,
>
> I was told once by Greg KH that the minimal number of changes to be one
> of the driver's authors is to change a significant amount of the code
> (like 20% or more).
>
> So, I prefer if you don't change it there.
>
Ok, no problem.
> > MODULE_LICENSE("GPL");
> >
> > static bool debug;
> > @@ -126,6 +126,7 @@ static int saa711x_has_reg(const int id, const u8 reg)
> > return 0;
> >
> > switch (id) {
> > + case V4L2_IDENT_GM7113C:
> > case V4L2_IDENT_SAA7113:
> > return reg != 0x14 && (reg < 0x18 || reg > 0x1e) && (reg < 0x20 || reg > 0x3f) &&
> > reg != 0x5d && reg < 0x63;
> > @@ -292,7 +293,7 @@ static const unsigned char saa7115_cfg_reset_scaler[] = {
> > 0x00, 0x00
> > };
> >
> > -/* ============== SAA7715 VIDEO templates ============= */
> > +/* ============== SAA7115 VIDEO templates ============= */
> >
> > static const unsigned char saa7115_cfg_60hz_video[] = {
> > R_80_GLOBAL_CNTL_1, 0x00, /* reset tasks */
> > @@ -445,7 +446,27 @@ static const unsigned char saa7115_cfg_50hz_video[] = {
> > 0x00, 0x00
> > };
> >
> > -/* ============== SAA7715 VIDEO templates (end) ======= */
> > +/* ============== SAA7115 VIDEO templates (end) ======= */
> > +
> > +/* ============== GM7113C VIDEO templates ============= */
> > +
> > +static const unsigned char gm7113c_cfg_60hz_video[] = {
> > + R_08_SYNC_CNTL, 0x68, /* 0xBO: auto detection, 0x68 = NTSC */
> > + R_0E_CHROMA_CNTL_1, 0x07, /* video autodetection is on */
> > +
> > + R_5A_V_OFF_FOR_SLICER, 0x06, /* standard 60hz value for ITU656 line counting */
> > + 0x00, 0x00
> > +};
> > +
> > +static const unsigned char gm7113c_cfg_50hz_video[] = {
> > + R_08_SYNC_CNTL, 0x28, /* 0x28 = PAL */
> > + R_0E_CHROMA_CNTL_1, 0x07,
> > +
> > + R_5A_V_OFF_FOR_SLICER, 0x03, /* standard 50hz value */
> > + 0x00, 0x00
> > +};
> > +
> > +/* ============== GM7113C VIDEO templates (end) ======= */
> >
> > static const unsigned char saa7115_cfg_vbi_on[] = {
> > R_80_GLOBAL_CNTL_1, 0x00, /* reset tasks */
> > @@ -927,11 +948,17 @@ static void saa711x_set_v4lstd(struct v4l2_subdev *sd, v4l2_std_id std)
> > // This works for NTSC-M, SECAM-L and the 50Hz PAL variants.
> > if (std & V4L2_STD_525_60) {
> > v4l2_dbg(1, debug, sd, "decoder set standard 60 Hz\n");
> > - saa711x_writeregs(sd, saa7115_cfg_60hz_video);
> > + if (state->ident == V4L2_IDENT_GM7113C)
> > + saa711x_writeregs(sd, gm7113c_cfg_60hz_video);
> > + else
> > + saa711x_writeregs(sd, saa7115_cfg_60hz_video);
> > saa711x_set_size(sd, 720, 480);
> > } else {
> > v4l2_dbg(1, debug, sd, "decoder set standard 50 Hz\n");
> > - saa711x_writeregs(sd, saa7115_cfg_50hz_video);
> > + if (state->ident == V4L2_IDENT_GM7113C)
> > + saa711x_writeregs(sd, gm7113c_cfg_50hz_video);
> > + else
> > + saa711x_writeregs(sd, saa7115_cfg_50hz_video);
> > saa711x_set_size(sd, 720, 576);
> > }
> >
> > @@ -944,7 +971,8 @@ static void saa711x_set_v4lstd(struct v4l2_subdev *sd, v4l2_std_id std)
> > 011 NTSC N (3.58MHz) PAL M (3.58MHz)
> > 100 reserved NTSC-Japan (3.58MHz)
> > */
> > - if (state->ident <= V4L2_IDENT_SAA7113) {
> > + if (state->ident <= V4L2_IDENT_SAA7113 ||
> > + state->ident == V4L2_IDENT_GM7113C) {
> > u8 reg = saa711x_read(sd, R_0E_CHROMA_CNTL_1) & 0x8f;
> >
> > if (std == V4L2_STD_PAL_M) {
> > @@ -1215,7 +1243,8 @@ static int saa711x_s_routing(struct v4l2_subdev *sd,
> > input, output);
> >
> > /* saa7111/3 does not have these inputs */
> > - if (state->ident <= V4L2_IDENT_SAA7113 &&
> > + if ((state->ident <= V4L2_IDENT_SAA7113 ||
> > + state->ident == V4L2_IDENT_GM7113C) &&
> > (input == SAA7115_COMPOSITE4 ||
> > input == SAA7115_COMPOSITE5)) {
> > return -EINVAL;
> > @@ -1586,8 +1615,11 @@ static int i2c_client *client,
> >
> > chip_id = name[5];
> >
> > +
> > /* Check whether this chip is part of the saa711x series */
> > - if (memcmp(name + 1, "f711", 4)) {
> > + if (memcmp(id->name + 1, "gm7113c", 7)) {
> > + chip_id = 'c';
>
> There are several issues on the above:
> 1) "id" may be NULL on autodetect mode;
>
> 2) Why are you adding 1 here?
> It should be, instead id->name
>
> 3) memcmp returns 0 if matches. So, the test is wrong.
> So, It should be instead:
> if (!memcmp(id->name, "gm7113c", 7)) {
>
> 4) Also, while that works, it seems a little hackish...
>
Oh, this is embarrassing.
I just tried to change as little as possible in this module to make the
device work.
You are completely right, it's just an ugly hack.
> > + } else if (memcmp(name + 1, "f711", 4)) {
> > v4l_dbg(1, debug, client, "chip found @ 0x%x (ID %s) does not match a known saa711x chip.\n",
> > client->addr << 1, name);
> > return -ENODEV;
> > @@ -1598,8 +1630,12 @@ static int saa711x_probe(struct i2c_client *client,
> > v4l_warn(client, "found saa711%c while %s was expected\n",
> > chip_id, id->name);
> > }
> > - snprintf(client->name, sizeof(client->name), "saa711%c", chip_id);
> > - v4l_info(client, "saa711%c found (%s) @ 0x%x (%s)\n", chip_id, name,
> > + if (chip_id == 'c')
>
> especially by needing to add a weird if here.
> See more below:
>
> > + snprintf(client->name, sizeof(client->name), "%s", id->name);
> > + else
> > + snprintf(client->name, sizeof(client->name), "saa711%c", chip_id);
> > +
> > + v4l_info(client, "%s found (%s) @ 0x%x (%s)\n", client->name, name,
> > client->addr << 1, client->adapter->name);
> >
> > state = kzalloc(sizeof(struct saa711x_state), GFP_KERNEL);
> > @@ -1645,6 +1681,9 @@ static int saa711x_probe(struct i2c_client *client,
> > state->ident = V4L2_IDENT_SAA7111A;
> > }
> > break;
> > + case 'c':
> > + state->ident = V4L2_IDENT_GM7113C;
> > + break;
>
> The better would be to initialize state->ident earlier, together with memcmp.
>
> Even better: please move the detection code into a separate
> routine that would internally fill state->ident and client->name
> and do what's needed to detect the chip.
>
> That would be cleaner and will reduce a little bit the complexity
> inside saa711x_probe.
>
> Something like:
>
> static int saa711x_detect_chip(struct i2c_client *client,
> struct saa711x_state *state,
> const struct i2c_device_id *id)
> {
> int i;
> char chip_id, name[16];
>
> /*
> * Check for gm7113c (a saa7113 clone). Currently, there's no
> * known way to autodetect it, so boards that use will need to
> * explicitly fill the id->name field.
> */
> if (id && !memcmp(id->name, "gm7113c", 7)) {
> state->ident = V4L2_IDENT_GM7113C;
> snprintf(client->name, sizeof(client->name), "%s", id->name);
> return 0;
> }
>
> /* Check for Philips/NXP original chips */
> for (i = 0; i < sizeof(name); i++) {
> i2c_smbus_write_byte_data(client, 0, i);
> name[i] = (i2c_smbus_read_byte_data(client, 0) & 0x0f) + '0';
> if (name[i] > '9')
> name[i] += 'a' - '9' - 1;
> }
> name[i] = '\0';
>
> if (memcmp(name + 1, "f711", 4))
> return -ENODEV;
>
> chip_id = name[5];
>
> snprintf(client->name, sizeof(client->name), "saa711%c", chip_id);
>
> /*
> * Put here the code that fills state->ident for Philips/NXP chips
> */
> ...
>
> return 0;
Yes this seems to be a much better way to do it.
I will fix my code.
Thank you.
> }
>
> > case '3':
> > state->ident = V4L2_IDENT_SAA7113;
> > break;
> > @@ -1675,6 +1714,7 @@ static int saa711x_probe(struct i2c_client *client,
> > saa711x_writeregs(sd, saa7111_init);
> > break;
> > case V4L2_IDENT_SAA7113:
> > + case V4L2_IDENT_GM7113C:
> > saa711x_writeregs(sd, saa7113_init);
> > break;
> > default:
> > @@ -1711,6 +1751,7 @@ static const struct i2c_device_id saa711x_id[] = {
> > { "saa7114", 0 },
> > { "saa7115", 0 },
> > { "saa7118", 0 },
> > + { "gm7113c", 0 },
> > { }
> > };
> > MODULE_DEVICE_TABLE(i2c, saa711x_id);
> > diff --git a/include/media/v4l2-chip-ident.h b/include/media/v4l2-chip-ident.h
> > index 4ee125b..fc13d53 100644
> > --- a/include/media/v4l2-chip-ident.h
> > +++ b/include/media/v4l2-chip-ident.h
> > @@ -51,6 +51,9 @@ enum {
> > V4L2_IDENT_SAA7114 = 104,
> > V4L2_IDENT_SAA7115 = 105,
> > V4L2_IDENT_SAA7118 = 108,
> > + /* This chip is a chinese clone of the saa7113 chip,
> > + * with some minor changes/bugs */
> > + V4L2_IDENT_GM7113C = 149,
> >
> > /* module saa7127: reserved range 150-199 */
> > V4L2_IDENT_SAA7127 = 157,
>
>
> --
>
> Cheers,
> Mauro
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