From: Pavel Machek <pavel@ucw.cz>
To: NeilBrown <neilb@suse.de>
Cc: Samuel Ortiz <sameo@linux.intel.com>,
Tony Lindgren <tony@atomide.com>,
Lee Jones <lee.jones@linaro.org>,
Sebastian Reichel <sre@kernel.org>,
Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>,
David Woodhouse <dwmw2@infradead.org>,
GTA04 owners <gta04-owner@goldelico.com>,
linux-omap@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-pm@vger.kernel.org
Subject: Re: [PATCH 09/15] twl4030_charger: allow max_current to be managed via sysfs.
Date: Mon, 2 Mar 2015 22:05:26 +0100 [thread overview]
Message-ID: <20150302210525.GN13270@amd> (raw)
In-Reply-To: <20150224043351.4243.46323.stgit@notabene.brown>
On Tue 2015-02-24 15:33:52, NeilBrown wrote:
> 'max_current' sysfs attributes are created which allow the
> max to be set.
> Whenever a current source changes, the default is restored.
> This will be followed by a uevent, so user-space can decide to
> update again.
Does this need Documentation update?
> Signed-off-by: NeilBrown <neilb@suse.de>
> ---
> drivers/power/twl4030_charger.c | 76 +++++++++++++++++++++++++++++++++++++++
> 1 file changed, 76 insertions(+)
>
> diff --git a/drivers/power/twl4030_charger.c b/drivers/power/twl4030_charger.c
> index bfc9b808301e..b0242786d047 100644
> --- a/drivers/power/twl4030_charger.c
> +++ b/drivers/power/twl4030_charger.c
> @@ -527,6 +529,67 @@ static irqreturn_t twl4030_bci_interrupt(int irq, void *arg)
> return IRQ_HANDLED;
> }
>
> +/*
> + * sysfs max_current store
> + */
That's not exactly useful comment.
> +static ssize_t
> +twl4030_bci_max_current_store(struct device *dev, struct device_attribute *attr,
> + const char *buf, size_t n)
> +{
> + struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
> + int cur = 0;
> + int status = 0;
> + status = kstrtoint(buf, 10, &cur);
> + if (status)
> + return status;
> + if (cur < 0)
> + return -EINVAL;
> + if (dev == bci->ac.dev) {
> + if (bci->ac_cur == cur)
> + return n;
> + bci->ac_cur = cur;
> + } else {
> + if (bci->usb_cur == cur)
> + return n;
> + bci->usb_cur = cur;
> + }
> + twl4030_charger_update_current(bci);
> + return (status == 0) ? n : status;
> +}
Uff. but we know that status == 0 at this point, no? Also... is
optimalization of not calling update_current() when nothing changed
worth it?
> +/*
> + * sysfs max_current show
> + */
> +static ssize_t twl4030_bci_max_current_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + int status = 0;
> + int cur = -1;
> + u8 bcictl1;
> + struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
> +
> + if (dev == bci->ac.dev) {
> + if (!bci->ac_is_active)
> + cur = bci->ac_cur;
> + } else {
> + if (bci->ac_is_active)
> + cur = bci->usb_cur;
> + }
> + if (cur < 0) {
> + cur = twl4030bci_read_adc_val(TWL4030_BCIIREF1);
> + if (cur < 0)
> + return cur;
> + status = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
> + if (status < 0)
> + return status;
> + cur = regval2ua(cur, bcictl1 & TWL4030_CGAIN);
> + }
> + return scnprintf(buf, PAGE_SIZE, "%u\n", cur);
> +}
Is this in uA or mA? uA. Ok.
Acked-by: Pavel Machek <pavel@ucw.cz>
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
next prev parent reply other threads:[~2015-03-02 21:05 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-02-24 4:33 [PATCH 00/15] Enhance twl4030_charger functionality NeilBrown
2015-02-24 4:33 ` [PATCH 02/15] twl4030_charger: use devm_request_threaded_irq NeilBrown
2015-02-24 4:33 ` [PATCH 03/15] twl4030_charger: use devres for power_supply_register and kzalloc NeilBrown
2015-03-07 20:25 ` Sebastian Reichel
2015-02-24 4:33 ` [PATCH 01/15] power_supply core: support use of devres to register/unregister a power supply NeilBrown
2015-02-26 2:25 ` Sebastian Reichel
2015-02-24 4:33 ` [PATCH 06/15] twl4030_charger: split uA calculation into a function NeilBrown
2015-03-02 21:05 ` Pavel Machek
2015-03-04 9:20 ` NeilBrown
2015-02-24 4:33 ` [PATCH 07/15] twl4030_charger: allow fine control of charger current NeilBrown
2015-03-02 21:05 ` Pavel Machek
2015-03-04 6:47 ` NeilBrown
2015-03-04 10:24 ` Pavel Machek
2015-03-07 20:32 ` Sebastian Reichel
2015-02-24 4:33 ` [PATCH 08/15] twl4030_charger: distinguish between USB current and 'AC' current NeilBrown
2015-03-02 21:05 ` Pavel Machek
2015-03-04 6:53 ` NeilBrown
2015-02-24 4:33 ` [PATCH 05/15] twl4030_charger: trust phy to determine when USB power is available NeilBrown
2015-02-24 4:33 ` [PATCH 04/15] twl4030_charger: use runtime_pm to keep usb phy active while charging NeilBrown
2015-02-25 7:24 ` Lee Jones
2015-03-05 5:48 ` NeilBrown
2015-02-24 4:33 ` [PATCH 11/15] twl4030_charger: enable manual enable/disable of usb charging NeilBrown
2015-03-02 21:03 ` Pavel Machek
2015-03-04 6:15 ` NeilBrown
2015-03-04 10:19 ` Pavel Machek
2015-02-24 4:33 ` [PATCH 12/15] twl4030_charger: add software controlled linear charging mode NeilBrown
2015-03-02 21:09 ` Pavel Machek
2015-03-05 6:33 ` NeilBrown
2015-03-06 21:24 ` twl4030_charger: need changes to get probed? Pavel Machek
2015-03-06 21:57 ` Pali Rohár
2015-03-06 22:12 ` Grazvydas Ignotas
2015-03-06 22:40 ` Pavel Machek
2015-03-06 22:56 ` Pali Rohár
2015-03-07 15:56 ` Grazvydas Ignotas
2015-03-07 16:43 ` Pali Rohár
2015-04-26 10:13 ` Pavel Machek
2015-03-07 21:01 ` Sebastian Reichel
2015-03-09 0:06 ` NeilBrown
2015-03-09 11:14 ` Sebastian Reichel
2015-02-24 4:33 ` [PATCH 09/15] twl4030_charger: allow max_current to be managed via sysfs NeilBrown
2015-03-02 21:05 ` Pavel Machek [this message]
2015-03-05 6:26 ` NeilBrown
2015-03-05 8:17 ` Pavel Machek
2015-03-07 20:37 ` Sebastian Reichel
2015-02-24 4:33 ` [PATCH 10/15] twl4030_charger: only draw USB current as negotiated with host NeilBrown
2015-03-02 21:05 ` Pavel Machek
2015-02-24 4:33 ` [PATCH 14/15] twl4030_charger: Increase current carefully while watching voltage NeilBrown
2015-03-02 21:29 ` Pavel Machek
2015-03-05 6:51 ` NeilBrown
2015-02-24 4:33 ` [PATCH 13/15] twl4030_charger: add ac/mode to match usb/mode NeilBrown
2015-03-02 21:13 ` Pavel Machek
2015-03-06 21:59 ` Grazvydas Ignotas
2015-03-22 23:13 ` NeilBrown
2015-02-24 4:33 ` [PATCH 15/15] twl4030_charger: assume a 'charger' can supply maximum current NeilBrown
2015-03-02 21:29 ` Pavel Machek
2015-03-05 6:45 ` NeilBrown
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