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SubjectRe: [PATCH 14/15] power: supply: olpc_battery: Avoid using platform_info
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.

> -#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;
?

> + 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
>


--
With Best Regards,
Andy Shevchenko

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