From: Peter Rosin <peda@axentia.se>
To: Hans de Goede <hdegoede@redhat.com>,
MyungJoo Ham <myungjoo.ham@samsung.com>,
Chanwoo Choi <cw00.choi@samsung.com>,
Guenter Roeck <linux@roeck-us.net>,
Heikki Krogerus <heikki.krogerus@linux.intel.com>,
Darren Hart <dvhart@infradead.org>,
Andy Shevchenko <andy@infradead.org>,
Mathias Nyman <mathias.nyman@intel.com>
Cc: platform-driver-x86@vger.kernel.org, devel@driverdev.osuosl.org,
Kuppuswamy Sathyanarayanan
<sathyanarayanan.kuppuswamy@linux.intel.com>,
Sathyanarayanan Kuppuswamy Natarajan <sathyaosid@gmail.com>,
linux-kernel@vger.kernel.org,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
linux-usb@vger.kernel.org
Subject: Re: [PATCH 02/11] mux: core: Add support for getting a mux controller on a non DT platform
Date: Mon, 4 Sep 2017 13:19:14 +0200 [thread overview]
Message-ID: <0c882d23-d008-3d61-27be-3fa22bf59521@axentia.se> (raw)
In-Reply-To: <20170901214845.7153-3-hdegoede@redhat.com>
Hi!
Some comments inline...
On 2017-09-01 23:48, Hans de Goede wrote:
> On non DT platforms we cannot get the mux_chip by pnode. Other subsystems
> (regulator, clock, pwm) have the same problem and solve this by allowing
> platform / board-setup code to add entries to a lookup table and then use
> this table to look things up.
>
> This commit adds support for getting a mux controller on a non DT platform
> following this pattern. It is based on a simplified version of the pwm
> subsys lookup code, the dev_id and mux_name parts of a lookup table entry
> are mandatory in the mux-core implementation.
>
> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
> ---
> drivers/mux/core.c | 96 +++++++++++++++++++++++++++++++++++++++++++-
> include/linux/mux/consumer.h | 11 +++++
> 2 files changed, 106 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mux/core.c b/drivers/mux/core.c
> index 6142493c327b..8864cc745506 100644
> --- a/drivers/mux/core.c
> +++ b/drivers/mux/core.c
> @@ -24,6 +24,9 @@
> #include <linux/of_platform.h>
> #include <linux/slab.h>
>
> +static DEFINE_MUTEX(mux_lookup_lock);
> +static LIST_HEAD(mux_lookup_list);
> +
> /*
> * The idle-as-is "state" is not an actual state that may be selected, it
> * only implies that the state should not be changed. So, use that state
> @@ -408,6 +411,23 @@ int mux_control_deselect(struct mux_control *mux)
> }
> EXPORT_SYMBOL_GPL(mux_control_deselect);
>
> +static int parent_name_match(struct device *dev, const void *data)
> +{
> + const char *parent_name = dev_name(dev->parent);
> + const char *name = data;
> +
> + return strcmp(parent_name, name) == 0;
> +}
> +
> +static struct mux_chip *mux_chip_get_by_name(const char *name)
> +{
> + struct device *dev;
> +
> + dev = class_find_device(&mux_class, NULL, name, parent_name_match);
> +
> + return dev ? to_mux_chip(dev) : NULL;
> +}
> +
> static int of_dev_node_match(struct device *dev, const void *data)
> {
> return dev->of_node == data;
> @@ -479,6 +499,42 @@ static struct mux_control *of_mux_control_get(struct device *dev,
> }
>
> /**
> + * mux_add_table() - register PWM device consumers
register mux controllers (because you are not registering consumers, right?
someone is registering controllers so that they can be found by consumers?)
> + * @table: array of consumers to register
> + * @num: number of consumers in table
controllers?
> + */
> +void mux_add_table(struct mux_lookup *table, size_t num)
> +{
> + mutex_lock(&mux_lookup_lock);
> +
> + while (num--) {
> + list_add_tail(&table->list, &mux_lookup_list);
> + table++;
> + }
I prefer
for (; num--; table++)
list_add_tail(&table->list, &mux_lookup_list);
> +
> + mutex_unlock(&mux_lookup_lock);
> +}
> +EXPORT_SYMBOL_GPL(mux_add_table);
> +
> +/**
> + * mux_remove_table() - unregister PWM device consumers
unregister mux controllers(?)
> + * @table: array of consumers to unregister
> + * @num: number of consumers in table
controllers?
> + */
> +void mux_remove_table(struct mux_lookup *table, size_t num)
> +{
> + mutex_lock(&mux_lookup_lock);
> +
> + while (num--) {
> + list_del(&table->list);
> + table++;
> + }
for() loop here as well.
> +
> + mutex_unlock(&mux_lookup_lock);
> +}
> +EXPORT_SYMBOL_GPL(mux_remove_table);
> +
> +/**
> * mux_control_get() - Get the mux-control for a device.
> * @dev: The device that needs a mux-control.
> * @mux_name: The name identifying the mux-control.
> @@ -487,11 +543,49 @@ static struct mux_control *of_mux_control_get(struct device *dev,
> */
> struct mux_control *mux_control_get(struct device *dev, const char *mux_name)
> {
> + struct mux_lookup *m, *chosen = NULL;
> + const char *dev_id = dev_name(dev);
> + struct mux_chip *mux_chip;
> +
> /* look up via DT first */
> if (IS_ENABLED(CONFIG_OF) && dev->of_node)
> return of_mux_control_get(dev, mux_name);
>
> - return ERR_PTR(-ENODEV);
> + /*
> + * For non DT we look up the provider in the static table typically
> + * provided by board setup code.
> + *
> + * If a match is found, the provider mux chip is looked up by name
> + * and a mux-control is requested using the table provided index.
> + */
> + mutex_lock(&mux_lookup_lock);
> + list_for_each_entry(m, &mux_lookup_list, list) {
> + if (WARN_ON(!m->dev_id || !m->mux_name || !m->provider))
> + continue;
> +
> + if (strcmp(m->dev_id, dev_id) == 0 &&
> + strcmp(m->mux_name, mux_name) == 0) {
I want the below format (with ! instead of == 0 and the brace on the next line
when the condition has a line break):
if (!strcmp(m->dev_id, dev_id) &&
!strcmp(m->mux_name, mux_name))
{
> + chosen = m;
> + break;
> + }
> + }
> + mutex_unlock(&mux_lookup_lock);
> +
> + if (!chosen)
> + return ERR_PTR(-ENODEV);
> +
> + mux_chip = mux_chip_get_by_name(chosen->provider);
> + if (!mux_chip)
> + return ERR_PTR(-EPROBE_DEFER);
> +
> + if (chosen->index >= mux_chip->controllers) {
> + dev_err(dev, "Mux lookup table index out of bounds %u >= %u\n",
> + chosen->index, mux_chip->controllers);
> + put_device(&mux_chip->dev);
> + return ERR_PTR(-EINVAL);
> + }
> +
> + return &mux_chip->mux[chosen->index];
> }
> EXPORT_SYMBOL_GPL(mux_control_get);
>
> diff --git a/include/linux/mux/consumer.h b/include/linux/mux/consumer.h
> index ea96d4c82be7..912dd48a3a5d 100644
> --- a/include/linux/mux/consumer.h
> +++ b/include/linux/mux/consumer.h
> @@ -18,6 +18,17 @@
> struct device;
> struct mux_control;
>
I want a kernel-doc comment here, describing the structure.
> +struct mux_lookup {
> + struct list_head list;
> + const char *provider;
> + unsigned int index;
> + const char *dev_id;
> + const char *mux_name;
> +};
> +
> +void mux_add_table(struct mux_lookup *table, size_t num);
> +void mux_remove_table(struct mux_lookup *table, size_t num);
> +
I'm not sure if consumer.h is the right place for this, but it can
be moved when I think of something better. Which I can't for the
moment...
> unsigned int mux_control_states(struct mux_control *mux);
> int __must_check mux_control_select(struct mux_control *mux,
> unsigned int state);
>
Cheers,
Peter
next prev parent reply other threads:[~2017-09-04 11:19 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-01 21:48 [PATCH 00/11] mux/typec: Add USB / TypeC mux drivers and hook them up on some x86 systems Hans de Goede
2017-09-01 21:48 ` [PATCH 01/11] mux: core: Add of_mux_control_get helper function Hans de Goede
2017-09-01 21:48 ` [PATCH 02/11] mux: core: Add support for getting a mux controller on a non DT platform Hans de Goede
2017-09-02 19:13 ` sathya
2017-09-04 14:21 ` Hans de Goede
2017-09-04 11:19 ` Peter Rosin [this message]
2017-09-05 10:58 ` Hans de Goede
2017-09-01 21:48 ` [PATCH 03/11] mux: consumer.h: Add MUX_USB_* state constant defines Hans de Goede
2017-09-02 10:10 ` Andy Shevchenko
2017-09-02 11:59 ` Hans de Goede
2017-09-02 14:59 ` Guenter Roeck
2017-09-02 15:59 ` Hans de Goede
2017-09-02 19:06 ` Guenter Roeck
2017-09-02 19:46 ` Hans de Goede
2017-09-01 21:48 ` [PATCH 04/11] usb: xhci: Add Intel cherrytrail extended cap / otg phy mux handling Hans de Goede
2017-09-04 7:31 ` Heikki Krogerus
2017-09-05 10:06 ` Hans de Goede
2017-09-01 21:48 ` [PATCH 05/11] mux: Add Intel Cherrytrail USB mux driver Hans de Goede
2017-09-02 10:19 ` Andy Shevchenko
2017-09-02 10:37 ` Dan Carpenter
2017-09-04 14:07 ` Hans de Goede
2017-09-04 11:19 ` Peter Rosin
2017-09-05 11:09 ` Hans de Goede
2017-09-01 21:48 ` [PATCH 06/11] mux: Add Pericom PI3USB30532 Type-C " Hans de Goede
2017-09-04 11:19 ` Peter Rosin
2017-09-05 7:46 ` Peter Rosin
2017-09-01 21:48 ` [PATCH 07/11] extcon: intel-int3496: Add support for controlling the USB-role mux Hans de Goede
2017-09-02 10:39 ` Andy Shevchenko
2017-09-04 14:11 ` Hans de Goede
2017-09-01 21:48 ` [PATCH 08/11] staging: typec: tcpm: Set mux to device mode when configured as such Hans de Goede
2017-09-01 21:48 ` [PATCH 09/11] staging: typec: Add Generic TCPC mux driver using the mux subsys Hans de Goede
2017-09-01 21:48 ` [PATCH 10/11] staging: typec: fusb302: Hook up mux support using tcpc_gen_mux support Hans de Goede
2017-09-01 21:48 ` [PATCH 11/11] platform/x86: intel_cht_int33fe: Add mux mappings for the Type-C port Hans de Goede
2017-09-02 10:42 ` Andy Shevchenko
2017-09-04 14:20 ` Hans de Goede
2017-09-04 11:18 ` [PATCH 00/11] mux/typec: Add USB / TypeC mux drivers and hook them up on some x86 systems Peter Rosin
2017-09-05 10:54 ` Hans de Goede
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=0c882d23-d008-3d61-27be-3fa22bf59521@axentia.se \
--to=peda@axentia.se \
--cc=andy@infradead.org \
--cc=cw00.choi@samsung.com \
--cc=devel@driverdev.osuosl.org \
--cc=dvhart@infradead.org \
--cc=gregkh@linuxfoundation.org \
--cc=hdegoede@redhat.com \
--cc=heikki.krogerus@linux.intel.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-usb@vger.kernel.org \
--cc=linux@roeck-us.net \
--cc=mathias.nyman@intel.com \
--cc=myungjoo.ham@samsung.com \
--cc=platform-driver-x86@vger.kernel.org \
--cc=sathyanarayanan.kuppuswamy@linux.intel.com \
--cc=sathyaosid@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).