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Message-ID: <20140505124745.GC16461@amd.pavel.ucw.cz>
Date: Mon, 5 May 2014 14:47:45 +0200
From: Pavel Machek <pavel@....cz>
To: Jenny Tc <jenny.tc@...el.com>, linux-kernel@...r.kernel.org,
dbaryshkov@...il.com, cbouatmailru@...il.com,
anton.vorontsov@...aro.org, tony@...mide.com,
linux-omap@...r.kernel.org
Subject: Re: [jenny.tc@...el.com: [RFC] power_supply: Introduce generic psy
charging driver]
Hi!
(Only part of original cc-list preserved.)
> RFC: Fixed comments for patch v8, removed sorting and string comparisons
Ok, its better now.
> The Power Supply charging driver connects multiple subsystems
> to do charging in a generic way. The subsystems involves power_supply,
> thermal and battery communication subsystems (1wire).With this the charging is
> handled in a generic way.
>
> The driver makes use of different new features - Battery Identification
> interfaces, pluggable charging algorithms, charger cable arbitrations etc.
> The patch also introduces generic interface for charger cable notifications.
> Charger cable events and capabilities can be notified using the generic
> power_supply_notifier chain.
>
> Overall this driver removes the charging logic out of the charger chip driver
> and the charger chip driver can just listen to the request from the power
> supply charging driver to set the charger properties. This can be implemented
> by exposing get_property and set property callbacks.
>
> Signed-off-by: Jenny TC <jenny.tc@...el.com>
> ---
> Documentation/power/power_supply_charger.txt | 350 +++++++++
> drivers/power/Kconfig | 8 +
> drivers/power/Makefile | 1 +
> drivers/power/power_supply_charger.c | 1066 ++++++++++++++++++++++++++
> drivers/power/power_supply_charger.h | 226 ++++++
> drivers/power/power_supply_core.c | 3 +
> include/linux/power/power_supply_charger.h | 304 ++++++++
> include/linux/power_supply.h | 161 ++++
> 8 files changed, 2119 insertions(+)
> create mode 100644 Documentation/power/power_supply_charger.txt
> create mode 100644 drivers/power/power_supply_charger.c
> create mode 100644 drivers/power/power_supply_charger.h
> create mode 100644 include/linux/power/power_supply_charger.h
>
> diff --git a/Documentation/power/power_supply_charger.txt b/Documentation/power/power_supply_charger.txt
> new file mode 100644
> index 0000000..1bb8cb4
> --- /dev/null
> +++ b/Documentation/power/power_supply_charger.txt
> @@ -0,0 +1,350 @@
> +1. Introduction
> +===============
> +
> +The Power Supply charging driver connects multiple subsystems
> +to do charging in a generic way. The subsystems involves power_supply,
> +thermal and battery communication subsystems (1wire).With this the charging is
Space after '.'.
> +static struct charger_cable cable_list[] = {
> + {
> + .psy_cable_type = PSY_CHARGER_CABLE_TYPE_USB_SDP,
> + },
> + {
> + .psy_cable_type = PSY_CHARGER_CABLE_TYPE_USB_CDP,
> + },
> + {
> + .psy_cable_type = PSY_CHARGER_CABLE_TYPE_USB_DCP,
> + },
> + {
> + .psy_cable_type = PSY_CHARGER_CABLE_TYPE_USB_ACA,
> + },
> + {
> + .psy_cable_type = PSY_CHARGER_CABLE_TYPE_ACA_DOCK,
> + },
> + {
> + .psy_cable_type = PSY_CHARGER_CABLE_TYPE_SE1,
> + },
> + {
> + .psy_cable_type = PSY_CHARGER_CABLE_TYPE_AC,
> + },
> +};
Can we get rid of this?
> +struct usb_phy *otg_xceiver;
> +static int handle_event_notification(struct notifier_block *nb,
> + unsigned long event, void *data);
> +struct notifier_block nb = {
> + .notifier_call = handle_event_notification,
> + };
You need to add way more statics.
> +static void update_supplied_to_psy(struct power_supply *psy)
> +{
> + WARN_ON(charger_context == NULL);
Useless.
> + for (i = 0; i < psy->num_supplicants; i++) {
> + charger_context->supplied_to_psy[cnt++] =
> + power_supply_get_by_name(psy->supplied_to[i]);
> + charger_context->supplied_to_psy[cnt] = NULL;
> + }
> +}
Still some name lookups to be killed.
> + for (i = 0; i < pst->num_supplicants; i++) {
> + psb = power_supply_get_by_name(pst->supplied_to[i]);
> + if (psb == psy) {
> + batt_context->supplied_by_psy[cnt++] = pst;
> + batt_context->supplied_by_psy[cnt] = NULL;
> + break;
> + }
> + }
> + }
And here.
> + WARN_ON(psy->data == NULL);
Useless.
> + charger_context = (struct psy_charger_context *)psy->data;
> +static inline bool is_supplied_to_has_ext_pwr_changed(struct power_supply *psy)
> +{
> + int i;
> + struct power_supply *psb;
> + bool is_pwr_changed_defined = true;
> +
> + for (i = 0; i < psy->num_supplicants; i++) {
> + psb =
> + power_supply_get_by_name(psy->
> + supplied_to[i]);
> + if (psb && !psb->external_power_changed)
> + is_pwr_changed_defined &= false;
> + }
You did not really get rid of the name lookups..
&= false. Bad idea.
> +static int trigger_algo(struct power_supply *psy)
> +{
> + unsigned long cc = 0, cv = 0, cc_min;
> + struct psy_batt_context *batt_context;
> + struct psy_charging_algo *algo;
> + struct psy_batt_chrg_prof chrg_profile;
> + struct power_supply *psc;
> + int cnt = 0;
> +
> + if (psy->type != POWER_SUPPLY_TYPE_BATTERY)
> + return 0;
> +
> + if (psy_get_battery_prop(&chrg_profile)) {
> + pr_err("Error in getting charge profile:%s:%d\n", __FILE__,
> + __LINE__);
> + return -EINVAL;
> + }
> +
> + batt_context = (struct psy_batt_context *)psy->data;
Create inline function doing the cast. You have too many opencoded
casts.
> + batt_context->algo_stat = algo->get_next_cc_cv
> + (&batt_context->batt_props, chrg_profile, &cc, &cv);
> +static inline void enable_supplied_by_charging
> + (struct power_supply *psy, bool is_enable)
This is not how you indent that, is it.
> +static void __power_supply_trigger_charging_handler(struct power_supply *psy)
> +{
> + int i;
> + struct power_supply *psb = NULL;
> +
> + if (!is_trigger_charging_algo(psy))
> + return;
> +
> + if (psy_is_battery(psy)) {
> + if (trigger_algo(psy))
> + enable_supplied_by_charging(psy, false);
> + else
> + enable_supplied_by_charging(psy, true);
enable...(psy, trigger_algo())
> +static inline int psy_throttle_cc_value
> + (struct power_supply *psy, unsigned int state)
Indent.
> +#define PSY_MAX_CV(psy) \
> + psy_get_ps_int_property(psy,\
> + POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX)
> +#define PSY_VOLTAGE_NOW(psy) \
> + psy_get_ps_int_property(psy, POWER_SUPPLY_PROP_VOLTAGE_NOW)
> +#define PSY_VOLTAGE_OCV(psy) \
> + psy_get_ps_int_property(psy, POWER_SUPPLY_PROP_VOLTAGE_OCV)
> +#define PSY_CURRENT_NOW(psy) \
> + psy_get_ps_int_property(psy, POWER_SUPPLY_PROP_CURRENT_NOW)
> +#define PSY_STATUS(psy) \
> + psy_get_ps_int_property(psy, POWER_SUPPLY_PROP_STATUS)
> +#define PSY_TEMPERATURE(psy) \
> + psy_get_ps_int_property(psy, POWER_SUPPLY_PROP_TEMP)
> +#define PSY_BATTERY_TYPE(psy) \
> + psy_get_ps_int_property(psy, POWER_SUPPLY_PROP_TECHNOLOGY)
> +#define PSY_ONLINE(psy) \
> + psy_get_ps_int_property(psy, POWER_SUPPLY_PROP_ONLINE)
This looks like bad idea. Just opencode it.
s/return /return /g
Thanks,
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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