Re: [PATCH] drivers/media/dvb-frontends: Implement probe/remove for stv6110x
From: Tobias Klausmann
Date: Sun May 26 2019 - 09:15:53 EST
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@xxxxxxxxxx>
---
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