Subject: v4.10-rc4 to v4.10-rc5: battery regression on Nokia N900

From: [email-masked] (Pavel Machek)
Date: Tue, 24 Jan 2017 00:26:54 +0100

Hi!

> > >I'll try to revert it on the top of v4.10-rc5 now... and yes, it fixes
> > >the issue.
> > >
> > >Any idea what went wrong and how to fix that?
> > >
> > >Anyway as we are at -rc5 and this is warning fix that caused a
> > >regression on different hardware... it should be reverted.
> > >
> > Agreed.
> > 
> > What exactly does "stopped working" mean ? That might help understanding
> > what went wrong.
> 
> /sys files related to battery no longer appear. I beieve this has
> something to do with it:
> 
> [    2.374877] of_get_named_gpiod_flags: parsed 'reset-gpios' property
> of node '/ocp at 68000000/spi at 48098000/tsc2005 at 0[0]' - status (0)
> [    2.375946] input: TSC2005 touchscreen as
> /devices/platform/68000000.ocp/48098000.spi/spi_master/spi1/spi1.0/input/input5
> [    2.392120] rx51-battery: probe of n900-battery failed with error
> -22

Mystery solved:

diff --git a/drivers/hwmon/hwmon.c b/drivers/hwmon/hwmon.c
index 3932f92..fe5ec82 100644
--- a/drivers/hwmon/hwmon.c
+++ b/drivers/hwmon/hwmon.c
@@ -545,8 +545,10 @@ __hwmon_device_register(struct device *dev, const char *name, void *drvdata,
 	int i, j, err, id;
 
 	/* Do not accept invalid characters in hwmon name attribute */
-	if (name && (!strlen(name) || strpbrk(name, "-* \t\n")))
+	if (name && (!strlen(name) || strpbrk(name, "-* \t\n"))) {
+		printk("hwmon: Invalid character detected: %s\n", name);
 		return ERR_PTR(-EINVAL);
+	}
 
 	id = ida_simple_get(&hwmon_ida, 0, 0, GFP_KERNEL);
 	if (id < 0)

pavel at n900:~$ dmesg | grep -5 Invalid
[    0.829650] of_get_named_gpiod_flags: parsed 'gpio-reset' property
of node '/ocp at 68000000/i2c at 48072000/tlv320aic3x at 19[0]' - status (0)
[    0.833831] tsl2563 2-0029: model 7, rev. 0
[    0.837768] of_get_named_gpiod_flags: parsed 'enable-gpio' property
of node '/ocp at 68000000/i2c at 48072000/lp5523 at 32[0]' - status (0)
[    1.921417] omap_i2c 48072000.i2c: controller timed out
[    2.056823] lp5523x 2-0032: lp5523 Programmable led chip found
[    2.064147] hwmon: Invalid character detected: bq27200-0
[    2.064544] bq27xxx-battery 2-0055: failed to register battery
[    2.064605] bq27xxx-battery: probe of 2-0055 failed with error -22
[    2.065368] of_get_named_gpiod_flags: parsed 'power-gpio' property
of node '/ocp at 68000000/i2c at 48072000/tpa6130a2 at 60[0]' - status (0)
[    2.083221] bq2415x-charger 2-006b: automode supported, waiting for
events
[    2.084442] bq2415x-charger 2-006b: driver registered
--
[    2.369842] g_ether gadget: g_ether ready
[    2.377197] tsc2005 spi1.0: GPIO lookup for consumer reset
[    2.377227] tsc2005 spi1.0: using device tree for GPIO lookup
[    2.377288] of_get_named_gpiod_flags: parsed 'reset-gpios' property
of node '/ocp at 68000000/spi at 48098000/tsc2005 at 0[0]' - status (0)
[    2.378936] input: TSC2005 touchscreen as
/devices/platform/68000000.ocp/48098000.spi/spi_master/spi1/spi1.0/input/input5
[    2.395111] hwmon: Invalid character detected: rx51-battery
[    2.402587] rx51-battery: probe of n900-battery failed with error
-22
[    2.410247] omap_hsmmc 4809c000.mmc: GPIO lookup for consumer cd
[    2.410247] omap_hsmmc 4809c000.mmc: using device tree for GPIO
lookup
[    2.410278] of_get_named_gpiod_flags: can't parse 'cd-gpios'
property of node '/ocp at 68000000/mmc at 4809c000[0]'
[    2.410278] of_get_named_gpiod_flags: can't parse 'cd-gpio'
property of node '/ocp at 68000000/mmc@4809c000[0]'

									Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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