1 files changed, 331 insertions, 0 deletions
diff --git a/drivers/hwmon/mc13783-adc.c b/drivers/hwmon/mc13783-adc.c
new file mode 100644
index 000000000..ff147e5e1
--- /dev/null
+++ b/drivers/hwmon/mc13783-adc.c
@@ -0,0 +1,331 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Driver for the ADC on Freescale Semiconductor MC13783 and MC13892 PMICs.
+ *
+ * Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved.
+ * Copyright (C) 2009 Sascha Hauer, Pengutronix
+ */
+
+#include <linux/mfd/mc13xxx.h>
+#include <linux/platform_device.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/hwmon.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/err.h>
+
+#define DRIVER_NAME	"mc13783-adc"
+
+/* platform device id driver data */
+#define MC13783_ADC_16CHANS	1
+#define MC13783_ADC_BPDIV2	2
+
+struct mc13783_adc_priv {
+	struct mc13xxx *mc13xxx;
+	struct device *hwmon_dev;
+	char name[PLATFORM_NAME_SIZE];
+};
+
+static ssize_t name_show(struct device *dev, struct device_attribute *devattr,
+			 char *buf)
+{
+	struct mc13783_adc_priv *priv = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%s\n", priv->name);
+}
+
+static int mc13783_adc_read(struct device *dev,
+		struct device_attribute *devattr, unsigned int *val)
+{
+	struct mc13783_adc_priv *priv = dev_get_drvdata(dev);
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+	unsigned int channel = attr->index;
+	unsigned int sample[4];
+	int ret;
+
+	ret = mc13xxx_adc_do_conversion(priv->mc13xxx,
+			MC13XXX_ADC_MODE_MULT_CHAN,
+			channel, 0, 0, sample);
+	if (ret)
+		return ret;
+
+	/* ADIN7 subchannels */
+	if (channel >= 16)
+		channel = 7;
+
+	channel &= 0x7;
+
+	*val = (sample[channel % 4] >> (channel > 3 ? 14 : 2)) & 0x3ff;
+
+	return 0;
+}
+
+static ssize_t mc13783_adc_bp_show(struct device *dev,
+				   struct device_attribute *devattr,
+				   char *buf)
+{
+	unsigned val;
+	struct platform_device *pdev = to_platform_device(dev);
+	kernel_ulong_t driver_data = platform_get_device_id(pdev)->driver_data;
+	int ret = mc13783_adc_read(dev, devattr, &val);
+
+	if (ret)
+		return ret;
+
+	if (driver_data & MC13783_ADC_BPDIV2)
+		val = DIV_ROUND_CLOSEST(val * 9, 2);
+	else
+		/*
+		 * BP (channel 2) reports with offset 2.4V to the actual value
+		 * to fit the input range of the ADC.  unit = 2.25mV = 9/4 mV.
+		 */
+		val = DIV_ROUND_CLOSEST(val * 9, 4) + 2400;
+
+	return sprintf(buf, "%u\n", val);
+}
+
+static ssize_t mc13783_adc_gp_show(struct device *dev,
+				   struct device_attribute *devattr,
+				   char *buf)
+{
+	unsigned val;
+	int ret = mc13783_adc_read(dev, devattr, &val);
+
+	if (ret)
+		return ret;
+
+	/*
+	 * input range is [0, 2.3V], val has 10 bits, so each bit
+	 * is worth 9/4 mV.
+	 */
+	val = DIV_ROUND_CLOSEST(val * 9, 4);
+
+	return sprintf(buf, "%u\n", val);
+}
+
+static ssize_t mc13783_adc_uid_show(struct device *dev,
+				    struct device_attribute *devattr,
+				    char *buf)
+{
+	unsigned int val;
+	struct platform_device *pdev = to_platform_device(dev);
+	kernel_ulong_t driver_data = platform_get_device_id(pdev)->driver_data;
+	int ret = mc13783_adc_read(dev, devattr, &val);
+
+	if (ret)
+		return ret;
+
+	if (driver_data & MC13783_ADC_BPDIV2)
+		/* MC13892 have 1/2 divider, input range is [0, 4.800V] */
+		val = DIV_ROUND_CLOSEST(val * 4800, 1024);
+	else
+		/* MC13783 have 0.9 divider, input range is [0, 2.555V] */
+		val = DIV_ROUND_CLOSEST(val * 2555, 1024);
+
+	return sprintf(buf, "%u\n", val);
+}
+
+static ssize_t mc13783_adc_temp_show(struct device *dev,
+				     struct device_attribute *devattr,
+				     char *buf)
+{
+	unsigned int val;
+	struct platform_device *pdev = to_platform_device(dev);
+	kernel_ulong_t driver_data = platform_get_device_id(pdev)->driver_data;
+	int ret = mc13783_adc_read(dev, devattr, &val);
+
+	if (ret)
+		return ret;
+
+	if (driver_data & MC13783_ADC_BPDIV2) {
+		/*
+		 * MC13892:
+		 * Die Temperature Read Out Code at 25C 680
+		 * Temperature change per LSB +0.4244C
+		 */
+		ret = DIV_ROUND_CLOSEST(-2635920 + val * 4244, 10);
+	} else {
+		/*
+		 * MC13783:
+		 * Die Temperature Read Out Code at 25C 282
+		 * Temperature change per LSB -1.14C
+		 */
+		ret = 346480 - 1140 * val;
+	}
+
+	return sprintf(buf, "%d\n", ret);
+}
+
+static DEVICE_ATTR_RO(name);
+static SENSOR_DEVICE_ATTR_RO(in2_input, mc13783_adc_bp, 2);
+static SENSOR_DEVICE_ATTR_RO(in5_input, mc13783_adc_gp, 5);
+static SENSOR_DEVICE_ATTR_RO(in6_input, mc13783_adc_gp, 6);
+static SENSOR_DEVICE_ATTR_RO(in7_input, mc13783_adc_gp, 7);
+static SENSOR_DEVICE_ATTR_RO(in8_input, mc13783_adc_gp, 8);
+static SENSOR_DEVICE_ATTR_RO(in9_input, mc13783_adc_gp, 9);
+static SENSOR_DEVICE_ATTR_RO(in10_input, mc13783_adc_gp, 10);
+static SENSOR_DEVICE_ATTR_RO(in11_input, mc13783_adc_gp, 11);
+static SENSOR_DEVICE_ATTR_RO(in12_input, mc13783_adc_gp, 12);
+static SENSOR_DEVICE_ATTR_RO(in13_input, mc13783_adc_gp, 13);
+static SENSOR_DEVICE_ATTR_RO(in14_input, mc13783_adc_gp, 14);
+static SENSOR_DEVICE_ATTR_RO(in15_input, mc13783_adc_gp, 15);
+static SENSOR_DEVICE_ATTR_RO(in16_input, mc13783_adc_uid, 16);
+static SENSOR_DEVICE_ATTR_RO(temp1_input, mc13783_adc_temp, 17);
+
+static struct attribute *mc13783_attr_base[] = {
+	&dev_attr_name.attr,
+	&sensor_dev_attr_in2_input.dev_attr.attr,
+	&sensor_dev_attr_in5_input.dev_attr.attr,
+	&sensor_dev_attr_in6_input.dev_attr.attr,
+	&sensor_dev_attr_in7_input.dev_attr.attr,
+	&sensor_dev_attr_in16_input.dev_attr.attr,
+	&sensor_dev_attr_temp1_input.dev_attr.attr,
+	NULL
+};
+
+static const struct attribute_group mc13783_group_base = {
+	.attrs = mc13783_attr_base,
+};
+
+/* these are only used if MC13783_ADC_16CHANS is provided in driver data */
+static struct attribute *mc13783_attr_16chans[] = {
+	&sensor_dev_attr_in8_input.dev_attr.attr,
+	&sensor_dev_attr_in9_input.dev_attr.attr,
+	&sensor_dev_attr_in10_input.dev_attr.attr,
+	&sensor_dev_attr_in11_input.dev_attr.attr,
+	NULL
+};
+
+static const struct attribute_group mc13783_group_16chans = {
+	.attrs = mc13783_attr_16chans,
+};
+
+/* last four channels may be occupied by the touchscreen */
+static struct attribute *mc13783_attr_ts[] = {
+	&sensor_dev_attr_in12_input.dev_attr.attr,
+	&sensor_dev_attr_in13_input.dev_attr.attr,
+	&sensor_dev_attr_in14_input.dev_attr.attr,
+	&sensor_dev_attr_in15_input.dev_attr.attr,
+	NULL
+};
+
+static const struct attribute_group mc13783_group_ts = {
+	.attrs = mc13783_attr_ts,
+};
+
+static int mc13783_adc_use_touchscreen(struct platform_device *pdev)
+{
+	struct mc13783_adc_priv *priv = platform_get_drvdata(pdev);
+	unsigned flags = mc13xxx_get_flags(priv->mc13xxx);
+
+	return flags & MC13XXX_USE_TOUCHSCREEN;
+}
+
+static int __init mc13783_adc_probe(struct platform_device *pdev)
+{
+	struct mc13783_adc_priv *priv;
+	int ret;
+	const struct platform_device_id *id = platform_get_device_id(pdev);
+	char *dash;
+
+	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->mc13xxx = dev_get_drvdata(pdev->dev.parent);
+	snprintf(priv->name, ARRAY_SIZE(priv->name), "%s", id->name);
+	dash = strchr(priv->name, '-');
+	if (dash)
+		*dash = '\0';
+
+	platform_set_drvdata(pdev, priv);
+
+	/* Register sysfs hooks */
+	ret = sysfs_create_group(&pdev->dev.kobj, &mc13783_group_base);
+	if (ret)
+		return ret;
+
+	if (id->driver_data & MC13783_ADC_16CHANS) {
+		ret = sysfs_create_group(&pdev->dev.kobj,
+				&mc13783_group_16chans);
+		if (ret)
+			goto out_err_create_16chans;
+	}
+
+	if (!mc13783_adc_use_touchscreen(pdev)) {
+		ret = sysfs_create_group(&pdev->dev.kobj, &mc13783_group_ts);
+		if (ret)
+			goto out_err_create_ts;
+	}
+
+	priv->hwmon_dev = hwmon_device_register(&pdev->dev);
+	if (IS_ERR(priv->hwmon_dev)) {
+		ret = PTR_ERR(priv->hwmon_dev);
+		dev_err(&pdev->dev,
+				"hwmon_device_register failed with %d.\n", ret);
+		goto out_err_register;
+	}
+
+	return 0;
+
+out_err_register:
+
+	if (!mc13783_adc_use_touchscreen(pdev))
+		sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_ts);
+out_err_create_ts:
+
+	if (id->driver_data & MC13783_ADC_16CHANS)
+		sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_16chans);
+out_err_create_16chans:
+
+	sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_base);
+	return ret;
+}
+
+static int mc13783_adc_remove(struct platform_device *pdev)
+{
+	struct mc13783_adc_priv *priv = platform_get_drvdata(pdev);
+	kernel_ulong_t driver_data = platform_get_device_id(pdev)->driver_data;
+
+	hwmon_device_unregister(priv->hwmon_dev);
+
+	if (!mc13783_adc_use_touchscreen(pdev))
+		sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_ts);
+
+	if (driver_data & MC13783_ADC_16CHANS)
+		sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_16chans);
+
+	sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_base);
+
+	return 0;
+}
+
+static const struct platform_device_id mc13783_adc_idtable[] = {
+	{
+		.name = "mc13783-adc",
+		.driver_data = MC13783_ADC_16CHANS,
+	}, {
+		.name = "mc13892-adc",
+		.driver_data = MC13783_ADC_BPDIV2,
+	}, {
+		/* sentinel */
+	}
+};
+MODULE_DEVICE_TABLE(platform, mc13783_adc_idtable);
+
+static struct platform_driver mc13783_adc_driver = {
+	.remove		= mc13783_adc_remove,
+	.driver		= {
+		.name	= DRIVER_NAME,
+	},
+	.id_table	= mc13783_adc_idtable,
+};
+
+module_platform_driver_probe(mc13783_adc_driver, mc13783_adc_probe);
+
+MODULE_DESCRIPTION("MC13783 ADC driver");
+MODULE_AUTHOR("Luotao Fu <l.fu@pengutronix.de>");
+MODULE_LICENSE("GPL");