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From: Grazvydas Ignotas <notasas@gmail.com>
To: Lars-Peter Clausen <lars@metafoo.de>
Cc: Anton Vorontsov <cbouatmailru@gmail.com>,
	Rodolfo Giometti <giometti@linux.it>,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH 07/14] bq27x00: Cache battery registers
Date: Sun, 13 Feb 2011 17:14:32 +0200	[thread overview]
Message-ID: <AANLkTiks6Dy8az8qxNJm4UPzJSRSmFU0b+M6ipjSey3f@mail.gmail.com> (raw)
In-Reply-To: <1297539554-13957-8-git-send-email-lars@metafoo.de>

On Sat, Feb 12, 2011 at 9:39 PM, Lars-Peter Clausen <lars@metafoo.de> wrote:
> This patch adds a register cache to the bq27x00 battery driver.
> Usually multiple, if not all, power_supply properties are queried at once,
> for example when an uevent is generated. Since some registers are used by
> multiple properties caching the registers should reduce the number of
> reads.
>
> The cache is valid for 5 seconds this roughly matches the internal update
> interval of the current register for the bq27000/bq27200.
>
> Fast changing properties(*_NOW) which can be obtained by reading a single
> register are not cached.
>
> It will also be used in the follow up patch to check if the battery status
> has been changed since the last update to emit power_supply_changed events.
>
> Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
> ---
>  drivers/power/bq27x00_battery.c |  272 +++++++++++++++++++++-----------------
>  1 files changed, 150 insertions(+), 122 deletions(-)
>
> diff --git a/drivers/power/bq27x00_battery.c b/drivers/power/bq27x00_battery.c
> index 44bc76b..0c94693 100644
> --- a/drivers/power/bq27x00_battery.c
> +++ b/drivers/power/bq27x00_battery.c
> @@ -19,7 +19,6 @@

<snip>

> +static void bq27x00_update(struct bq27x00_device_info *di)
> +{
> +       struct bq27x00_reg_cache cache = {0, };
> +       bool is_bq27500 = di->chip == BQ27500;
> +
> +       cache.flags = bq27x00_read(di, BQ27x00_REG_FLAGS, is_bq27500);
> +       if (cache.flags >= 0) {
> +               cache.capacity = bq27x00_battery_read_rsoc(di);
> +               cache.temperature = bq27x00_read(di, BQ27x00_REG_TEMP, false);
> +               cache.time_to_empty = bq27x00_battery_read_time(di, BQ27x00_REG_TTE);
> +               cache.time_to_empty_avg = bq27x00_battery_read_time(di, BQ27x00_REG_TTECP);
> +               cache.time_to_full = bq27x00_battery_read_time(di, BQ27x00_REG_TTF);
> +
> +               if (!is_bq27500)
> +                       cache.current_now = bq27x00_read(di, BQ27x00_REG_AI, false);
>        }
>

<snip>

> -static int bq27x00_battery_current(struct bq27x00_device_info *di)
> +static int bq27x00_battery_current(struct bq27x00_device_info *di,
> +       union power_supply_propval *val)
>  {
> -       int ret;
> -       int curr = 0;
> -       int flags = 0;
> +       int curr;
>
> -       ret = bq27x00_read(di, BQ27x00_REG_AI, &curr, false);
> -       if (ret) {
> -               dev_err(di->dev, "error reading current\n");
> -               return 0;
> -       }
> +       if (di->chip == BQ27000)
> +           curr = bq27x00_read(di, BQ27x00_REG_AI, false);
> +       else
> +           curr = di->cache.current_now;

You're updating current_now in cache if it's not bq27500, but
bypassing cache for bq27000?

Why do you still want to cache the current while you are no longer
caching voltage, because it needs 2 register reads I guess?

  reply	other threads:[~2011-02-13 15:14 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-02-12 19:38 [PATCH v2 00/14] POWER: BQ27x00: New Properties, fixes, bq27000 support Lars-Peter Clausen
2011-02-12 19:39 ` [PATCH 01/14] bq27x00: Add type property Lars-Peter Clausen
2011-02-12 19:39 ` [PATCH 02/14] bq27x00: Improve temperature property precession Lars-Peter Clausen
2011-02-12 19:39 ` [PATCH 03/14] bq27x00: Fix CURRENT_NOW property Lars-Peter Clausen
2011-02-12 19:39 ` [PATCH 04/14] bq27x00: Return -ENODEV for properties if the battery is not present Lars-Peter Clausen
2011-02-12 19:39 ` [PATCH 05/14] bq27x00: Prepare code for addition of bq27000 platform driver Lars-Peter Clausen
2011-02-12 19:39 ` [PATCH 06/14] bq27x00: Add bq27000 support Lars-Peter Clausen
2011-02-12 19:39 ` [PATCH 07/14] bq27x00: Cache battery registers Lars-Peter Clausen
2011-02-13 15:14   ` Grazvydas Ignotas [this message]
2011-02-13 18:56     ` Lars-Peter Clausen
2011-02-14  3:01   ` [PATCH 07/14 v3] " Lars-Peter Clausen
2011-02-14 21:58     ` Grazvydas Ignotas
2011-02-14 22:14       ` Lars-Peter Clausen
2011-02-15 11:48         ` Grazvydas Ignotas
2011-02-15 22:39           ` Grazvydas Ignotas
2011-02-21  8:28             ` Lars-Peter Clausen
2011-02-21 14:00               ` Grazvydas Ignotas
2011-02-21 14:49                 ` Lars-Peter Clausen
2011-02-21 21:23                   ` Grazvydas Ignotas
2011-02-12 19:39 ` [PATCH v2 07/14] bq27X00: " Lars-Peter Clausen
2011-02-12 19:52   ` Lars-Peter Clausen
2011-02-12 19:39 ` [PATCH 08/14] bq27x00: Poll battery state Lars-Peter Clausen
2011-02-12 19:39 ` [PATCH 09/14] bq27x00: Add new properties Lars-Peter Clausen
2011-02-12 19:39 ` [PATCH 10/14] bq27x00: Add MODULE_DEVICE_TABLE Lars-Peter Clausen
2011-02-12 19:39 ` [PATCH 11/14] bq27x00: Give more specific reports on battery status Lars-Peter Clausen
2011-02-12 19:39 ` [PATCH 12/14] bq27x00: Minor cleanups Lars-Peter Clausen
2011-02-12 19:39 ` [PATCH 13/14] bq27x00: Cleanup bq27x00_i2c_read Lars-Peter Clausen
2011-02-12 19:39 ` [PATCH 14/14] Ignore -ENODATA errors when generating a uevent Lars-Peter Clausen

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