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SubjectRe: [PATCH 09/15] twl4030_charger: allow max_current to be managed via sysfs.
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


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