Re: [PATCH v8 4/4] power: wm831x_power: Support USB charger current limit management
From: Geert Uytterhoeven <geert@linux-m68k.org>
Date: 2016-03-27 08:22:48
Also in:
lkml
On Thu, Mar 24, 2016 at 1:35 PM, Baolin Wang [off-list ref] wrote:
quoted hunk ↗ jump to hunk
--- a/drivers/power/wm831x_power.c +++ b/drivers/power/wm831x_power.c@@ -13,6 +13,7 @@ #include <linux/platform_device.h> #include <linux/power_supply.h> #include <linux/slab.h> +#include <linux/usb/usb_charger.h> #include <linux/mfd/wm831x/core.h> #include <linux/mfd/wm831x/auxadc.h>@@ -31,6 +32,8 @@ struct wm831x_power { char usb_name[20]; char battery_name[20]; bool have_battery; + struct usb_charger *usb_charger; + struct notifier_block usb_notify; }; static int wm831x_power_check_online(struct wm831x *wm831x, int supply,@@ -125,6 +128,43 @@ static enum power_supply_property wm831x_usb_props[] = { POWER_SUPPLY_PROP_VOLTAGE_NOW, }; +/* In milliamps */ +static unsigned int wm831x_usb_limits[] = {
const
+ 0,
+ 2,
+ 100,
+ 500,
+ 900,
+ 1500,
+ 1800,
+ 550,
+};
+
+static int wm831x_usb_limit_change(struct notifier_block *nb,
+ unsigned long limit, void *data)
+{
+ struct wm831x_power *wm831x_power = container_of(nb,
+ struct wm831x_power,
+ usb_notify);
+ int i, best;unsigned int
+
+ /* Find the highest supported limit */
+ best = 0;
+ for (i = 0; i < ARRAY_SIZE(wm831x_usb_limits); i++) {
+ if (limit >= wm831x_usb_limits[i] &&
+ wm831x_usb_limits[best] < wm831x_usb_limits[i])
+ best = i;
+ }
+
+ dev_dbg(wm831x_power->wm831x->dev,
+ "Limiting USB current to %dmA", wm831x_usb_limits[best]);
%u
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds