Re: [PATCH 12/15] twl4030_charger: add software controlled linear charging mode.
From: Pavel Machek
Date: Mon Mar 02 2015 - 16:09:36 EST
On Tue 2015-02-24 15:33:52, NeilBrown wrote:
> Add a 'continuous' option for usb charging which enabled
> the "linear" charging mode of the twl4030.
Documentation/ :-).
> Linear charging does a good job with not so reliable power sources, since
> several voltage controlling is then often too intelligent.
Parse error.
> It was used with a bike hub dynamo since a year or so. In that case there
> are automatically charging stops when the cyclist needs a break.
>
> Orignal-by: Andreas Kemnade <andreas@xxxxxxxxxxxx>
> Signed-off-by: NeilBrown <neilb@xxxxxxx>
> + ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x33,
> + TWL4030_BCIWDKEY);
> + /* 0x24 + EKEY6: off mode */
" " -> " "
> + ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x2a,
> + TWL4030_BCIMDKEY);
> + /* EKEY2: Linear charge: usb path */
USB
> + ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x26,
> + TWL4030_BCIMDKEY);
> + /* WDKEY5: stop watchdog count */
> + ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xf3,
> + TWL4030_BCIWDKEY);
> + /* enable MFEN3 access */
> + ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x9c,
> + TWL4030_BCIMFKEY);
> + /* ICHGEOCEN - end-of-charge monitor (current < 80mA)
> + * (charging continues)
> + * ICHGLOWEN - current level monitor (charge continues)
> + * don't monitor over-current or heat save
Heat save? Is ignoring over-current good idea?
> @@ -650,6 +684,8 @@ twl4030_bci_mode_store(struct device *dev, struct device_attribute *attr,
> mode = 0;
> else if (sysfs_streq(buf, modes[1]))
> mode = 1;
> + else if (sysfs_streq(buf, modes[2]))
> + mode = 2;
Time for loop?
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/