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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/hwmon/mc13783-adc.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/hwmon/mc13783-adc.c')
-rw-r--r--drivers/hwmon/mc13783-adc.c331
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");