linux-kernel - [PATCH v4 09/11] thermal: sun8i: rework for ths calibrate func

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Message-Id: <20190623164206.7467-10-tiny.windzz@gmail.com>
Date:   Sun, 23 Jun 2019 12:42:04 -0400
From:   Yangtao Li <tiny.windzz@...il.com>
To:     rui.zhang@...el.com, edubezval@...il.com,
        daniel.lezcano@...aro.org, robh+dt@...nel.org,
        mark.rutland@....com, maxime.ripard@...tlin.com, wens@...e.org,
        davem@...emloft.net, gregkh@...uxfoundation.org,
        mchehab+samsung@...nel.org, linus.walleij@...aro.org,
        nicolas.ferre@...rochip.com, paulmck@...ux.ibm.com
Cc:     linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Yangtao Li <tiny.windzz@...il.com>
Subject: [PATCH v4 09/11] thermal: sun8i: rework for ths calibrate func

Here, we do something to prepare for the subsequent
support of multiple platforms.

1) rename sun50i_ths_calibrate to sun8i_ths_calibrate, because
   this function should be suitable for all platforms now.

2) introduce calibrate callback to mask calibration method
   differences.

Signed-off-by: Yangtao Li <tiny.windzz@...il.com>
---
 drivers/thermal/sun8i_thermal.c | 86 ++++++++++++++++++---------------
 1 file changed, 48 insertions(+), 38 deletions(-)

diff --git a/drivers/thermal/sun8i_thermal.c b/drivers/thermal/sun8i_thermal.c
index 04f53ffb6a14..260b24340f5b 100644
--- a/drivers/thermal/sun8i_thermal.c
+++ b/drivers/thermal/sun8i_thermal.c
@@ -60,6 +60,8 @@ struct ths_thermal_chip {
 	int		scale;
 	int		ft_deviation;
 	int		temp_data_base;
+	int		(*calibrate)(struct ths_device *tmdev,
+				     u16 *caldata, int callen);
 	int		(*init)(struct ths_device *tmdev);
 	int             (*irq_ack)(struct ths_device *tmdev);
 };
@@ -152,45 +154,14 @@ static irqreturn_t sun8i_irq_thread(int irq, void *data)
 	return IRQ_HANDLED;
 }
 
-static int sun50i_ths_calibrate(struct ths_device *tmdev)
+static int sun50i_h6_ths_calibrate(struct ths_device *tmdev,
+				   u16 *caldata, int callen)
 {
-	struct nvmem_cell *calcell;
 	struct device *dev = tmdev->dev;
-	u16 *caldata;
-	size_t callen;
-	int ft_temp;
-	int i, ret = 0;
-
-	calcell = devm_nvmem_cell_get(dev, "calib");
-	if (IS_ERR(calcell)) {
-		if (PTR_ERR(calcell) == -EPROBE_DEFER)
-			return -EPROBE_DEFER;
-		/*
-		 * Even if the external calibration data stored in sid is
-		 * not accessible, the THS hardware can still work, although
-		 * the data won't be so accurate.
-		 *
-		 * The default value of calibration register is 0x800 for
-		 * every sensor, and the calibration value is usually 0x7xx
-		 * or 0x8xx, so they won't be away from the default value
-		 * for a lot.
-		 *
-		 * So here we do not return error if the calibartion data is
-		 * not available, except the probe needs deferring.
-		 */
-		goto out;
-	}
+	int i, ft_temp;
 
-	caldata = nvmem_cell_read(calcell, &callen);
-	if (IS_ERR(caldata)) {
-		ret = PTR_ERR(caldata);
-		goto out;
-	}
-
-	if (!caldata[0] || callen < 2 + 2 * tmdev->chip->sensor_num) {
-		ret = -EINVAL;
-		goto out_free;
-	}
+	if (!caldata[0] || callen < 2 + 2 * tmdev->chip->sensor_num)
+		return -EINVAL;
 
 	/*
 	 * efuse layout:
@@ -251,7 +222,45 @@ static int sun50i_ths_calibrate(struct ths_device *tmdev)
 		}
 	}
 
-out_free:
+	return 0;
+}
+
+static int sun8i_ths_calibrate(struct ths_device *tmdev)
+{
+	struct nvmem_cell *calcell;
+	struct device *dev = tmdev->dev;
+	u16 *caldata;
+	size_t callen;
+	int ret = 0;
+
+	calcell = devm_nvmem_cell_get(dev, "calib");
+	if (IS_ERR(calcell)) {
+		if (PTR_ERR(calcell) == -EPROBE_DEFER)
+			return -EPROBE_DEFER;
+		/*
+		 * Even if the external calibration data stored in sid is
+		 * not accessible, the THS hardware can still work, although
+		 * the data won't be so accurate.
+		 *
+		 * The default value of calibration register is 0x800 for
+		 * every sensor, and the calibration value is usually 0x7xx
+		 * or 0x8xx, so they won't be away from the default value
+		 * for a lot.
+		 *
+		 * So here we do not return error if the calibartion data is
+		 * not available, except the probe needs deferring.
+		 */
+		goto out;
+	}
+
+	caldata = nvmem_cell_read(calcell, &callen);
+	if (IS_ERR(caldata)) {
+		ret = PTR_ERR(caldata);
+		goto out;
+	}
+
+	tmdev->chip->calibrate(tmdev, caldata, callen);
+
 	kfree(caldata);
 out:
 	return ret;
@@ -300,7 +309,7 @@ static int sun8i_ths_resource_init(struct ths_device *tmdev)
 	if (ret)
 		goto bus_disable;
 
-	ret = sun50i_ths_calibrate(tmdev);
+	ret = sun8i_ths_calibrate(tmdev);
 	if (ret)
 		goto ahb_disable;
 
@@ -428,6 +437,7 @@ static const struct ths_thermal_chip sun50i_h6_ths = {
 	.scale = -67,
 	.ft_deviation = SUN50I_H6_FT_DEVIATION,
 	.temp_data_base = SUN50I_H6_THS_TEMP_DATA,
+	.calibrate = sun50i_h6_ths_calibrate,
 	.init = sun50i_thermal_init,
 	.irq_ack = sun50i_h6_irq_ack,
 };
-- 
2.17.1