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SubjectRe: [PATCH 14/15] power: supply: olpc_battery: Avoid using platform_info
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On Fri, 2018-10-19 at 16:50 +0300, Andy Shevchenko wrote:
> On Wed, Oct 10, 2018 at 8:24 PM Lubomir Rintel <lkundrak@v3.sk>
> wrote:
> > This wouldn't work on the DT-based ARM platform. Let's read the EC
> > version
> > directly from the EC driver instead.
> >
> > This makes the driver no longer x86 specific.
> >
> > Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
> > ---
> > drivers/power/supply/Kconfig | 2 +-
> > drivers/power/supply/olpc_battery.c | 35 +++++++++++++++++++++--
> > ------
> > 2 files changed, 27 insertions(+), 10 deletions(-)
> >
> > diff --git a/drivers/power/supply/Kconfig
> > b/drivers/power/supply/Kconfig
> > index ff6dab0bf0dd..f0361e4dd457 100644
> > --- a/drivers/power/supply/Kconfig
> > +++ b/drivers/power/supply/Kconfig
> > @@ -151,7 +151,7 @@ config BATTERY_PMU
> >
> > config BATTERY_OLPC
> > tristate "One Laptop Per Child battery"
> > - depends on X86_32 && OLPC
> > + depends on OLPC
> > help
> > Say Y to enable support for the battery on the OLPC
> > laptop.
> >
> > diff --git a/drivers/power/supply/olpc_battery.c
> > b/drivers/power/supply/olpc_battery.c
> > index 2a2d7cc995f0..dde9863e5c4a 100644
> > --- a/drivers/power/supply/olpc_battery.c
> > +++ b/drivers/power/supply/olpc_battery.c
> > @@ -20,8 +20,6 @@
> > #include <linux/sched.h>
> > #include <linux/olpc-ec.h>
> > #include <linux/of.h>
>
> Btw, Kconfig might miss
> depends on OF
> part.

But will it? I thought this header can be included regardless,
providing stubs that always fail instead of actual OF functionality.

It just wouldn't be too useful apart for compile-testing things.

Apart from that, CONFIG_OLPC drags in CONFIG_OF, so we're always
getting CONFIG_OF transitively.

>
> > -#include <asm/olpc.h>
> > -
> >
> > #define EC_BAT_VOLTAGE 0x10 /*
> > uint16_t, *9.76/32, mV */
> > #define EC_BAT_CURRENT 0x11 /* int16_t, *15.625/120,
> > mA */
> > @@ -57,6 +55,7 @@ struct olpc_battery_data {
> > struct power_supply *olpc_ac;
> > struct power_supply *olpc_bat;
> > char bat_serial[17];
> > + int new_proto;
> > };
> >
> > /*****************************************************************
> > ****
> > @@ -100,7 +99,7 @@ static const struct power_supply_desc
> > olpc_ac_desc = {
> > static int olpc_bat_get_status(struct olpc_battery_data *data,
> > union power_supply_propval *val, uint8_t ec_byte)
> > {
> > - if (olpc_platform_info.ecver > 0x44) {
> > + if (data->new_proto) {
> > if (ec_byte & (BAT_STAT_CHARGING |
> > BAT_STAT_TRICKLE))
> > val->intval = POWER_SUPPLY_STATUS_CHARGING;
> > else if (ec_byte & BAT_STAT_DISCHARGING)
> > @@ -608,14 +607,32 @@ static int olpc_battery_probe(struct
> > platform_device *pdev)
> > struct power_supply_config psy_cfg = {};
> > struct olpc_battery_data *data;
> > uint8_t status;
> > + unsigned char ecver[1];
>
> isn't it simple
> uint8_t ecver;
> ?

Yes, it's probably going to be nicer that way.

>
> > + int ret;
> > +
> > + data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
> > + if (!data)
> > + return -ENOMEM;
> > + platform_set_drvdata(pdev, data);
> > +
> > + /* See if the EC is already there and get the EC revision
> > */
> > + ret = olpc_ec_cmd(EC_FIRMWARE_REV, NULL, 0, ecver,
> > ARRAY_SIZE(ecver));
> > + if (ret) {
> > + if (ret == -ENODEV)
> > + return -EPROBE_DEFER;
>
> Yeah, exactly a question I asked somewhere in the first part of the
> series.
>
> > + return ret;
> > + }
> >
> > - /*
> > - * We've seen a number of EC protocol changes; this driver
> > requires
> > - * the latest EC protocol, supported by 0x44 and above.
> > - */
> > - if (olpc_platform_info.ecver < 0x44) {
> > + if (ecver[0] > 0x44) {
> > + /* XO 1 or 1.5 with a new EC firmware. */
> > + data->new_proto = 1;
> > + } else if (ecver[0] < 0x44) {
> > + /*
> > + * We've seen a number of EC protocol changes; this
> > driver
> > + * requires the latest EC protocol, supported by
> > 0x44 and above.
> > + */
> > printk(KERN_NOTICE "OLPC EC version 0x%02x too old
> > for "
> > - "battery driver.\n",
> > olpc_platform_info.ecver);
> > + "battery driver.\n", ecver[0]);
> > return -ENXIO;
> > }
> >
> > --
> > 2.19.0
> >

Thanks,
Lubo

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