Patchwork [v2,16/17] power: supply: olpc_battery: Avoid using platform_info

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Submitter Lubomir Rintel
Date Nov. 16, 2018, 4:24 p.m.
Message ID <20181116162403.49854-17-lkundrak@v3.sk>
Download mbox | patch
Permalink /patch/658713/
State New
Headers show

Comments

Lubomir Rintel - Nov. 16, 2018, 4:24 p.m.
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>
Acked-by: Pavel Machek <pavel@ucw.cz>

---
Changes since v1:
- Use uint8_t instead of unsigned char [1] for ecver

 drivers/power/supply/Kconfig        |  2 +-
 drivers/power/supply/olpc_battery.c | 35 +++++++++++++++++++++--------
 2 files changed, 27 insertions(+), 10 deletions(-)
Sebastian Reichel - Dec. 5, 2018, 8:59 p.m.
Hi,

On Fri, Nov 16, 2018 at 05:24:02PM +0100, Lubomir Rintel 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>
> Acked-by: Pavel Machek <pavel@ucw.cz>
> 
> ---
> Changes since v1:
> - Use uint8_t instead of unsigned char [1] for ecver
> 
>  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 f27cf0709500..dd7ae1431098 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 4433eb10a23d..ec5dfb8fcb8a 100644
> --- a/drivers/power/supply/olpc_battery.c
> +++ b/drivers/power/supply/olpc_battery.c
> @@ -20,8 +20,6 @@
>  #include <linux/jiffies.h>
>  #include <linux/sched.h>
>  #include <linux/olpc-ec.h>
> -#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;
> +	uint8_t ecver;
> +	int ret;
> +
> +	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
> +	if (!data)
> +		return -ENOMEM;
> +	platform_set_drvdata(pdev, data);

This ended up in the wrong patch. Otherwise

Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com>

-- Sebastian

> +	/* See if the EC is already there and get the EC revision */
> +	ret = olpc_ec_cmd(EC_FIRMWARE_REV, NULL, 0, &ecver, 1);
> +	if (ret) {
> +		if (ret == -ENODEV)
> +			return -EPROBE_DEFER;
> +		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 > 0x44) {
> +		/* XO 1 or 1.5 with a new EC firmware. */
> +		data->new_proto = 1;
> +	} else if (ecver < 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);
>  		return -ENXIO;
>  	}
>  
> -- 
> 2.19.1
>

Patch

diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig
index f27cf0709500..dd7ae1431098 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 4433eb10a23d..ec5dfb8fcb8a 100644
--- a/drivers/power/supply/olpc_battery.c
+++ b/drivers/power/supply/olpc_battery.c
@@ -20,8 +20,6 @@ 
 #include <linux/jiffies.h>
 #include <linux/sched.h>
 #include <linux/olpc-ec.h>
-#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;
+	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, 1);
+	if (ret) {
+		if (ret == -ENODEV)
+			return -EPROBE_DEFER;
+		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 > 0x44) {
+		/* XO 1 or 1.5 with a new EC firmware. */
+		data->new_proto = 1;
+	} else if (ecver < 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);
 		return -ENXIO;
 	}