1 files changed, 120 insertions, 75 deletions

diff --git a/drivers/iio/adc/mt6577_auxadc.c b/drivers/iio/adc/mt6577_auxadc.c
index 2d104c828041..fe9e3ece3fda 100644
--- a/drivers/iio/adc/mt6577_auxadc.c
+++ b/drivers/iio/adc/mt6577_auxadc.c
@@ -1,15 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Copyright (c) 2016 MediaTek Inc.
  * Author: Zhiyong Tao <zhiyong.tao@mediatek.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
  */
 
 #include <linux/clk.h>
@@ -17,9 +9,9 @@
 #include <linux/err.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
-#include <linux/of.h>
-#include <linux/of_device.h>
+#include <linux/mod_devicetable.h>
 #include <linux/platform_device.h>
+#include <linux/property.h>
 #include <linux/iopoll.h>
 #include <linux/io.h>
 #include <linux/iio/iio.h>
@@ -42,10 +34,31 @@
 #define MT6577_AUXADC_POWER_READY_MS          1
 #define MT6577_AUXADC_SAMPLE_READY_US         25
 
+struct mtk_auxadc_compatible {
+	bool sample_data_cali;
+	bool check_global_idle;
+};
+
 struct mt6577_auxadc_device {
 	void __iomem *reg_base;
 	struct clk *adc_clk;
 	struct mutex lock;
+	const struct mtk_auxadc_compatible *dev_comp;
+};
+
+static const struct mtk_auxadc_compatible mt8186_compat = {
+	.sample_data_cali = false,
+	.check_global_idle = false,
+};
+
+static const struct mtk_auxadc_compatible mt8173_compat = {
+	.sample_data_cali = false,
+	.check_global_idle = true,
+};
+
+static const struct mtk_auxadc_compatible mt6765_compat = {
+	.sample_data_cali = true,
+	.check_global_idle = false,
 };
 
 #define MT6577_AUXADC_CHANNEL(idx) {				    \
@@ -74,6 +87,15 @@ static const struct iio_chan_spec mt6577_auxadc_iio_channels[] = {
 	MT6577_AUXADC_CHANNEL(15),
 };
 
+/* For Voltage calculation */
+#define VOLTAGE_FULL_RANGE  1500	/* VA voltage */
+#define AUXADC_PRECISE      4096	/* 12 bits */
+
+static int mt_auxadc_get_cali_data(int rawdata, bool enable_cali)
+{
+	return rawdata;
+}
+
 static inline void mt6577_auxadc_mod_reg(void __iomem *reg,
 					 u32 or_mask, u32 and_mask)
 {
@@ -120,15 +142,17 @@ static int mt6577_auxadc_read(struct iio_dev *indio_dev,
 	/* we must delay here for hardware sample channel data */
 	udelay(MT6577_AUXADC_SAMPLE_READY_US);
 
-	/* check MTK_AUXADC_CON2 if auxadc is idle */
-	ret = readl_poll_timeout(adc_dev->reg_base + MT6577_AUXADC_CON2, val,
-				 ((val & MT6577_AUXADC_STA) == 0),
-				 MT6577_AUXADC_SLEEP_US,
-				 MT6577_AUXADC_TIMEOUT_US);
-	if (ret < 0) {
-		dev_err(indio_dev->dev.parent,
-			"wait for auxadc idle time out\n");
-		goto err_timeout;
+	if (adc_dev->dev_comp->check_global_idle) {
+		/* check MTK_AUXADC_CON2 if auxadc is idle */
+		ret = readl_poll_timeout(adc_dev->reg_base + MT6577_AUXADC_CON2,
+					 val, ((val & MT6577_AUXADC_STA) == 0),
+					 MT6577_AUXADC_SLEEP_US,
+					 MT6577_AUXADC_TIMEOUT_US);
+		if (ret < 0) {
+			dev_err(indio_dev->dev.parent,
+				"wait for auxadc idle time out\n");
+			goto err_timeout;
+		}
 	}
 
 	/* read channel and make sure ready bit == 1 */
@@ -163,6 +187,8 @@ static int mt6577_auxadc_read_raw(struct iio_dev *indio_dev,
 				  int *val2,
 				  long info)
 {
+	struct mt6577_auxadc_device *adc_dev = iio_priv(indio_dev);
+
 	switch (info) {
 	case IIO_CHAN_INFO_PROCESSED:
 		*val = mt6577_auxadc_read(indio_dev, chan);
@@ -172,6 +198,12 @@ static int mt6577_auxadc_read_raw(struct iio_dev *indio_dev,
 				chan->channel);
 			return *val;
 		}
+		if (adc_dev->dev_comp->sample_data_cali)
+			*val = mt_auxadc_get_cali_data(*val, true);
+
+		/* Convert adc raw data to voltage: 0 - 1500 mV */
+		*val = *val * VOLTAGE_FULL_RANGE / AUXADC_PRECISE;
+
 		return IIO_VAL_INT;
 
 	default:
@@ -180,15 +212,52 @@ static int mt6577_auxadc_read_raw(struct iio_dev *indio_dev,
 }
 
 static const struct iio_info mt6577_auxadc_info = {
-	.driver_module = THIS_MODULE,
 	.read_raw = &mt6577_auxadc_read_raw,
 };
 
+static int mt6577_auxadc_resume(struct device *dev)
+{
+	struct iio_dev *indio_dev = dev_get_drvdata(dev);
+	struct mt6577_auxadc_device *adc_dev = iio_priv(indio_dev);
+	int ret;
+
+	ret = clk_prepare_enable(adc_dev->adc_clk);
+	if (ret) {
+		pr_err("failed to enable auxadc clock\n");
+		return ret;
+	}
+
+	mt6577_auxadc_mod_reg(adc_dev->reg_base + MT6577_AUXADC_MISC,
+			      MT6577_AUXADC_PDN_EN, 0);
+	mdelay(MT6577_AUXADC_POWER_READY_MS);
+
+	return 0;
+}
+
+static int mt6577_auxadc_suspend(struct device *dev)
+{
+	struct iio_dev *indio_dev = dev_get_drvdata(dev);
+	struct mt6577_auxadc_device *adc_dev = iio_priv(indio_dev);
+
+	mt6577_auxadc_mod_reg(adc_dev->reg_base + MT6577_AUXADC_MISC,
+			      0, MT6577_AUXADC_PDN_EN);
+	clk_disable_unprepare(adc_dev->adc_clk);
+
+	return 0;
+}
+
+static void mt6577_power_off(void *data)
+{
+	struct mt6577_auxadc_device *adc_dev = data;
+
+	mt6577_auxadc_mod_reg(adc_dev->reg_base + MT6577_AUXADC_MISC,
+			      0, MT6577_AUXADC_PDN_EN);
+}
+
 static int mt6577_auxadc_probe(struct platform_device *pdev)
 {
 	struct mt6577_auxadc_device *adc_dev;
 	unsigned long adc_clk_rate;
-	struct resource *res;
 	struct iio_dev *indio_dev;
 	int ret;
 
@@ -197,81 +266,57 @@ static int mt6577_auxadc_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	adc_dev = iio_priv(indio_dev);
-	indio_dev->dev.parent = &pdev->dev;
 	indio_dev->name = dev_name(&pdev->dev);
 	indio_dev->info = &mt6577_auxadc_info;
 	indio_dev->modes = INDIO_DIRECT_MODE;
 	indio_dev->channels = mt6577_auxadc_iio_channels;
 	indio_dev->num_channels = ARRAY_SIZE(mt6577_auxadc_iio_channels);
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	adc_dev->reg_base = devm_ioremap_resource(&pdev->dev, res);
-	if (IS_ERR(adc_dev->reg_base)) {
-		dev_err(&pdev->dev, "failed to get auxadc base address\n");
-		return PTR_ERR(adc_dev->reg_base);
-	}
-
-	adc_dev->adc_clk = devm_clk_get(&pdev->dev, "main");
-	if (IS_ERR(adc_dev->adc_clk)) {
-		dev_err(&pdev->dev, "failed to get auxadc clock\n");
-		return PTR_ERR(adc_dev->adc_clk);
-	}
+	adc_dev->reg_base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(adc_dev->reg_base))
+		return dev_err_probe(&pdev->dev, PTR_ERR(adc_dev->reg_base),
+				     "failed to get auxadc base address\n");
 
-	ret = clk_prepare_enable(adc_dev->adc_clk);
-	if (ret) {
-		dev_err(&pdev->dev, "failed to enable auxadc clock\n");
-		return ret;
-	}
+	adc_dev->adc_clk = devm_clk_get_enabled(&pdev->dev, "main");
+	if (IS_ERR(adc_dev->adc_clk))
+		return dev_err_probe(&pdev->dev, PTR_ERR(adc_dev->adc_clk),
+				     "failed to enable auxadc clock\n");
 
 	adc_clk_rate = clk_get_rate(adc_dev->adc_clk);
-	if (!adc_clk_rate) {
-		ret = -EINVAL;
-		dev_err(&pdev->dev, "null clock rate\n");
-		goto err_disable_clk;
-	}
+	if (!adc_clk_rate)
+		return dev_err_probe(&pdev->dev, -EINVAL, "null clock rate\n");
+
+	adc_dev->dev_comp = device_get_match_data(&pdev->dev);
 
 	mutex_init(&adc_dev->lock);
 
 	mt6577_auxadc_mod_reg(adc_dev->reg_base + MT6577_AUXADC_MISC,
 			      MT6577_AUXADC_PDN_EN, 0);
 	mdelay(MT6577_AUXADC_POWER_READY_MS);
-
 	platform_set_drvdata(pdev, indio_dev);
 
-	ret = iio_device_register(indio_dev);
-	if (ret < 0) {
-		dev_err(&pdev->dev, "failed to register iio device\n");
-		goto err_power_off;
-	}
-
-	return 0;
-
-err_power_off:
-	mt6577_auxadc_mod_reg(adc_dev->reg_base + MT6577_AUXADC_MISC,
-			      0, MT6577_AUXADC_PDN_EN);
-err_disable_clk:
-	clk_disable_unprepare(adc_dev->adc_clk);
-	return ret;
-}
-
-static int mt6577_auxadc_remove(struct platform_device *pdev)
-{
-	struct iio_dev *indio_dev = platform_get_drvdata(pdev);
-	struct mt6577_auxadc_device *adc_dev = iio_priv(indio_dev);
-
-	iio_device_unregister(indio_dev);
-
-	mt6577_auxadc_mod_reg(adc_dev->reg_base + MT6577_AUXADC_MISC,
-			      0, MT6577_AUXADC_PDN_EN);
+	ret = devm_add_action_or_reset(&pdev->dev, mt6577_power_off, adc_dev);
+	if (ret)
+		return ret;
 
-	clk_disable_unprepare(adc_dev->adc_clk);
+	ret = devm_iio_device_register(&pdev->dev, indio_dev);
+	if (ret < 0)
+		return dev_err_probe(&pdev->dev, ret, "failed to register iio device\n");
 
 	return 0;
 }
 
+static DEFINE_SIMPLE_DEV_PM_OPS(mt6577_auxadc_pm_ops,
+				mt6577_auxadc_suspend,
+				mt6577_auxadc_resume);
+
 static const struct of_device_id mt6577_auxadc_of_match[] = {
-	{ .compatible = "mediatek,mt2701-auxadc", },
-	{ .compatible = "mediatek,mt8173-auxadc", },
+	{ .compatible = "mediatek,mt2701-auxadc", .data = &mt8173_compat },
+	{ .compatible = "mediatek,mt2712-auxadc", .data = &mt8173_compat },
+	{ .compatible = "mediatek,mt7622-auxadc", .data = &mt8173_compat },
+	{ .compatible = "mediatek,mt8173-auxadc", .data = &mt8173_compat },
+	{ .compatible = "mediatek,mt8186-auxadc", .data = &mt8186_compat },
+	{ .compatible = "mediatek,mt6765-auxadc", .data = &mt6765_compat },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, mt6577_auxadc_of_match);
@@ -280,9 +325,9 @@ static struct platform_driver mt6577_auxadc_driver = {
 	.driver = {
 		.name   = "mt6577-auxadc",
 		.of_match_table = mt6577_auxadc_of_match,
+		.pm = pm_sleep_ptr(&mt6577_auxadc_pm_ops),
 	},
 	.probe	= mt6577_auxadc_probe,
-	.remove	= mt6577_auxadc_remove,
 };
 module_platform_driver(mt6577_auxadc_driver);