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Date: Sun, 26 May 2019 15:11:44 +0200
From: Tobias Klausmann <tobias.johannes.klausmann@....thm.de>
To: Sean Young <sean@...s.org>
Cc: linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
mchehab@...nel.org
Subject: Re: [PATCH] drivers/media/dvb-frontends: Implement probe/remove for
stv6110x
Hello,
answers, if appropriate, inline!
On 26.05.19 11:33, Sean Young wrote:
> Hi Tobias,
>
> On Sun, May 12, 2019 at 04:53:06PM +0200, Tobias Klausmann wrote:
>> Ping,
>>
>> comments for this patch are appreciated!
> Sorry for not back to you earlier.
No problem, thanks for reviewing!
>
> Please run script/checkpatch.pl --strict on your patch. There are several
> cosmetic changes needed.
Will do!
>> Thanks,
>>
>> Tobias
>>
>>
>> On 09.05.19 21:51, Tobias Klausmann wrote:
>>> Refactor out the common parts of stv6110x_probe() and stv6110x_attach() into
>>> separate functions.
>>>
>>> This provides the needed functionality to use dvb_module_probe() instead of
>>> dvb_attach()!
> The lines shouldn't be longer than 75 characters.
>
> This is a great improvement. It would be nice to see an actual driver use
> dvb_module_probe() rather than dvb_attach(), so that the new code paths
> are used. Do you have hardware to test this?
I have hardware for a driver living out of tree (sadly): saa716x. So
that driver was used to test the new functionality provided by this
patch. I could convert the drivers in-tree to use the new
dvb_module_probe(), yet without actually testing it.
>
>>> Signed-off-by: Tobias Klausmann <tobias.johannes.klausmann@....thm.de>
>>> ---
>>> drivers/media/dvb-frontends/stv6110x.c | 125 ++++++++++++++++----
>>> drivers/media/dvb-frontends/stv6110x.h | 3 +
>>> drivers/media/dvb-frontends/stv6110x_priv.h | 3 +-
>>> 3 files changed, 109 insertions(+), 22 deletions(-)
>>>
>>> diff --git a/drivers/media/dvb-frontends/stv6110x.c b/drivers/media/dvb-frontends/stv6110x.c
>>> index 82c002d3833a..17bc7adf3771 100644
>>> --- a/drivers/media/dvb-frontends/stv6110x.c
>>> +++ b/drivers/media/dvb-frontends/stv6110x.c
>>> @@ -345,6 +345,33 @@ static void stv6110x_release(struct dvb_frontend *fe)
>>> kfree(stv6110x);
>>> }
>>> +void st6110x_init_regs(struct stv6110x_state *stv6110x)
>>> +{
>>> + u8 default_regs[] = {0x07, 0x11, 0xdc, 0x85, 0x17, 0x01, 0xe6, 0x1e};
>>> +
>>> + memcpy(stv6110x->regs, default_regs, 8);
>>> +}
>>> +
>>> +void stv6110x_setup_divider(struct stv6110x_state *stv6110x)
>>> +{
>>> + switch (stv6110x->config->clk_div) {
>>> + default:
>>> + case 1:
>>> + STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL2], CTRL2_CO_DIV, 0);
>>> + break;
>>> + case 2:
>>> + STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL2], CTRL2_CO_DIV, 1);
>>> + break;
>>> + case 4:
>>> + STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL2], CTRL2_CO_DIV, 2);
>>> + break;
>>> + case 8:
>>> + case 0:
>>> + STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL2], CTRL2_CO_DIV, 3);
>>> + break;
>>> + }
>>> +}
>>> +
>>> static const struct dvb_tuner_ops stv6110x_ops = {
>>> .info = {
>>> .name = "STV6110(A) Silicon Tuner",
>>> @@ -354,7 +381,7 @@ static const struct dvb_tuner_ops stv6110x_ops = {
>>> .release = stv6110x_release
>>> };
>>> -static const struct stv6110x_devctl stv6110x_ctl = {
>>> +static struct stv6110x_devctl stv6110x_ctl = {
>>> .tuner_init = stv6110x_init,
>>> .tuner_sleep = stv6110x_sleep,
>>> .tuner_set_mode = stv6110x_set_mode,
>>> @@ -368,39 +395,77 @@ static const struct stv6110x_devctl stv6110x_ctl = {
>>> .tuner_get_status = stv6110x_get_status,
>>> };
>>> +void stv6110x_set_frontend_opts(struct stv6110x_state *stv6110x)
>>> +{
>>> + stv6110x->frontend->tuner_priv = stv6110x;
>>> + stv6110x->frontend->ops.tuner_ops = stv6110x_ops;
>>> +}
>>> +
>>> +static struct stv6110x_devctl *stv6110x_get_devctl(struct i2c_client *client)
>>> +{
>>> + struct stv6110x_state *stv6110x = i2c_get_clientdata(client);
>>> +
>>> + dev_dbg(&client->dev, "\n");
>>> +
>>> + return stv6110x->devctl;
>>> +}
>>> +
>>> +static int stv6110x_probe(struct i2c_client *client,
>>> + const struct i2c_device_id *id)
>>> +{
>>> + struct stv6110x_config *config = client->dev.platform_data;
>>> +
>>> + struct stv6110x_state *stv6110x;
>>> +
>>> + stv6110x = kzalloc(sizeof(struct stv6110x_state), GFP_KERNEL);
> This should be:
> stv6110x = kzalloc(sizeof(*stv6110x), GFP_KERNEL);
>
>>> + if (!stv6110x)
>>> + return -ENOMEM;
>>> +
>>> + stv6110x->frontend = config->frontend;
>>> + stv6110x->i2c = client->adapter;
>>> + stv6110x->config = config;
>>> + stv6110x->devctl = &stv6110x_ctl;
>>> +
>>> + st6110x_init_regs(stv6110x);
>>> + stv6110x_setup_divider(stv6110x);
>>> + stv6110x_set_frontend_opts(stv6110x);
>>> +
>>> + printk(KERN_INFO "%s: Probed STV6110x\n", __func__);
> Please use dev_info().
>
>>> +
>>> + i2c_set_clientdata(client, stv6110x);
>>> +
>>> + /* setup callbacks */
>>> + config->get_devctl = stv6110x_get_devctl;
>>> +
>>> + return 0;
>>> +}
>>> +
>>> +static int stv6110x_remove(struct i2c_client *client)
>>> +{
>>> + struct stv6110x_state *stv6110x = i2c_get_clientdata(client);
>>> +
>>> + stv6110x_release(stv6110x->frontend);
>>> + return 0;
>>> +}
>>> +
>>> const struct stv6110x_devctl *stv6110x_attach(struct dvb_frontend *fe,
>>> const struct stv6110x_config *config,
>>> struct i2c_adapter *i2c)
>>> {
>>> struct stv6110x_state *stv6110x;
>>> - u8 default_regs[] = {0x07, 0x11, 0xdc, 0x85, 0x17, 0x01, 0xe6, 0x1e};
>>> - stv6110x = kzalloc(sizeof (struct stv6110x_state), GFP_KERNEL);
>>> + stv6110x = kzalloc(sizeof(struct stv6110x_state), GFP_KERNEL);
> stv6110x = kzalloc(sizeof(*stv6110x), GFP_KERNEL);
>
> Maybe we can patch up the dvb_attach() call sites and do away with
> stv6110x_attach completely. Do you have dvb hardware with this frontend
> to test?
See answer above!
>
>
>>> if (!stv6110x)
>>> return NULL;
>>> + stv6110x->frontend = fe;
>>> stv6110x->i2c = i2c;
>>> stv6110x->config = config;
>>> stv6110x->devctl = &stv6110x_ctl;
>>> - memcpy(stv6110x->regs, default_regs, 8);
>>> - /* setup divider */
>>> - switch (stv6110x->config->clk_div) {
>>> - default:
>>> - case 1:
>>> - STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL2], CTRL2_CO_DIV, 0);
>>> - break;
>>> - case 2:
>>> - STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL2], CTRL2_CO_DIV, 1);
>>> - break;
>>> - case 4:
>>> - STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL2], CTRL2_CO_DIV, 2);
>>> - break;
>>> - case 8:
>>> - case 0:
>>> - STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL2], CTRL2_CO_DIV, 3);
>>> - break;
>>> - }
>>> + st6110x_init_regs(stv6110x);
>>> + stv6110x_setup_divider(stv6110x);
>>> + stv6110x_set_frontend_opts(stv6110x);
>>> fe->tuner_priv = stv6110x;
>>> fe->ops.tuner_ops = stv6110x_ops;
>>> @@ -410,6 +475,24 @@ const struct stv6110x_devctl *stv6110x_attach(struct dvb_frontend *fe,
>>> }
>>> EXPORT_SYMBOL(stv6110x_attach);
>>> +static const struct i2c_device_id stv6110x_id_table[] = {
>>> + {"stv6110x", 0},
>>> + {}
>>> +};
>>> +MODULE_DEVICE_TABLE(i2c, stv6110x_id_table);
>>> +
>>> +static struct i2c_driver stv6110x_driver = {
>>> + .driver = {
>>> + .name = "stv6110x",
>>> + .suppress_bind_attrs = true,
>>> + },
>>> + .probe = stv6110x_probe,
>>> + .remove = stv6110x_remove,
>>> + .id_table = stv6110x_id_table,
>>> +};
>>> +
>>> +module_i2c_driver(stv6110x_driver);
>>> +
>>> MODULE_AUTHOR("Manu Abraham");
>>> MODULE_DESCRIPTION("STV6110x Silicon tuner");
>>> MODULE_LICENSE("GPL");
>>> diff --git a/drivers/media/dvb-frontends/stv6110x.h b/drivers/media/dvb-frontends/stv6110x.h
>>> index 696b6e5b9e7b..7714adea5242 100644
>>> --- a/drivers/media/dvb-frontends/stv6110x.h
>>> +++ b/drivers/media/dvb-frontends/stv6110x.h
>>> @@ -27,6 +27,9 @@ struct stv6110x_config {
>>> u8 addr;
>>> u32 refclk;
>>> u8 clk_div; /* divisor value for the output clock */
>>> + struct dvb_frontend *frontend;
>>> +
>>> + struct stv6110x_devctl* (*get_devctl)(struct i2c_client *);
> The i2c_client needs an argument name.
>
>>> };
>>> enum tuner_mode {
>>> diff --git a/drivers/media/dvb-frontends/stv6110x_priv.h b/drivers/media/dvb-frontends/stv6110x_priv.h
>>> index 109dfaf4ba42..383549d25268 100644
>>> --- a/drivers/media/dvb-frontends/stv6110x_priv.h
>>> +++ b/drivers/media/dvb-frontends/stv6110x_priv.h
>>> @@ -66,11 +66,12 @@
>>> #define REFCLOCK_MHz (stv6110x->config->refclk / 1000000)
>>> struct stv6110x_state {
>>> + struct dvb_frontend *frontend;
>>> struct i2c_adapter *i2c;
>>> const struct stv6110x_config *config;
>>> u8 regs[8];
>>> - const struct stv6110x_devctl *devctl;
>>> + struct stv6110x_devctl *devctl;
>>> };
>>> #endif /* __STV6110x_PRIV_H */
>
> Thanks,
>
> Sean
for the other comments: Adaptations will come with a v2 patch!
Thanks,
Tobias
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