power: supply: axp288_charger: Drop platform_data dependency

When the axp288_charger driver was originally merged, it was merged with
a dependency on some other driver providing platform data for it.

However the battery-data-framework which should provide that data never
got merged, so the axp288_charger as merged upstream has never worked,
its probe method simply always returns -ENODEV.

This commit removes the dependency on the platform_data instead reading
back the charging current and charging voltage that the firmware has set
and using those values as the maximum values the user may set.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Sebastian Reichel <sre@kernel.org>

drivers/power/supply/axp288_charger.c

@@ -143,7 +143,6 @@ enum {
 
 struct axp288_chrg_info {
 	struct platform_device *pdev;
-	struct axp20x_chrg_pdata *pdata;
 	struct regmap *regmap;
 	struct regmap_irq_chip_data *regmap_irqc;
 	int irq[CHRG_INTR_END];
@@ -769,17 +768,14 @@ static int charger_init_hw_regs(struct axp288_chrg_info *info)
 		return ret;
 	}
 
-	/* Init charging current and voltage */
-	info->max_cc = info->pdata->max_cc;
-	info->max_cv = info->pdata->max_cv;
-
 	/* Read current charge voltage and current limit */
 	ret = regmap_read(info->regmap, AXP20X_CHRG_CTRL1, &val);
 	if (ret < 0) {
-		/* Assume default if cannot read */
-		info->cc = info->pdata->def_cc;
-		info->cv = info->pdata->def_cv;
-	} else {
+		dev_err(&info->pdev->dev, "register(%x) read error(%d)\n",
+			AXP20X_CHRG_CTRL1, ret);
+		return ret;
+	}
+
 	/* Determine charge voltage */
 	cv = (val & CHRG_CCCV_CV_MASK) >> CHRG_CCCV_CV_BIT_POS;
 	switch (cv) {
@@ -795,9 +791,6 @@ static int charger_init_hw_regs(struct axp288_chrg_info *info)
 	case CHRG_CCCV_CV_4350MV:
 		info->cv = CV_4350MV;
 		break;
-		default:
-			info->cv = INT_MAX;
-			break;
 	}
 
 	/* Determine charge current limit */
@@ -805,24 +798,12 @@ static int charger_init_hw_regs(struct axp288_chrg_info *info)
 	cc = (cc * CHRG_CCCV_CC_LSB_RES) + CHRG_CCCV_CC_OFFSET;
 	info->cc = cc;
 
-		/* Program default charging voltage and current */
-		cc = min(info->pdata->def_cc, info->max_cc);
-		cv = min(info->pdata->def_cv, info->max_cv);
-
-		ret = axp288_charger_set_cc(info, cc);
-		if (ret < 0) {
-			dev_err(&info->pdev->dev,
-					"error(%d) in setting CC\n", ret);
-			return ret;
-		}
-
-		ret = axp288_charger_set_cv(info, cv);
-		if (ret < 0) {
-			dev_err(&info->pdev->dev,
-					"error(%d) in setting CV\n", ret);
-			return ret;
-		}
-	}
+	/*
+	 * Do not allow the user to configure higher settings then those
+	 * set by the firmware
+	 */
+	info->max_cv = info->cv;
+	info->max_cc = info->cc;
 
 	return 0;
 }
@@ -841,15 +822,6 @@ static int axp288_charger_probe(struct platform_device *pdev)
 	info->pdev = pdev;
 	info->regmap = axp20x->regmap;
 	info->regmap_irqc = axp20x->regmap_irqc;
-	info->pdata = pdev->dev.platform_data;
-
-	if (!info->pdata) {
-		/* Try ACPI provided pdata via device properties */
-		if (!device_property_present(&pdev->dev,
-						"axp288_charger_data\n"))
-			dev_err(&pdev->dev, "failed to get platform data\n");
-		return -ENODEV;
-	}
 
 	info->cable.edev = extcon_get_extcon_dev(AXP288_EXTCON_DEV_NAME);
 	if (info->cable.edev == NULL) {

include/linux/mfd/axp20x.h

@@ -554,13 +554,6 @@ struct axp20x_fg_pdata {
 	int thermistor_curve[MAX_THERM_CURVE_SIZE][2];
 };
 
-struct axp20x_chrg_pdata {
-	int max_cc;
-	int max_cv;
-	int def_cc;
-	int def_cv;
-};
-
 struct axp288_extcon_pdata {
 	/* GPIO pin control to switch D+/D- lines b/w PMIC and SOC */
 	struct gpio_desc *gpio_mux_cntl;