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Linux/drivers/hwmon/wm831x-hwmon.c

  1 /*
  2  * drivers/hwmon/wm831x-hwmon.c - Wolfson Microelectronics WM831x PMIC
  3  *                                hardware monitoring features.
  4  *
  5  * Copyright (C) 2009 Wolfson Microelectronics plc
  6  *
  7  * This program is free software; you can redistribute it and/or modify it
  8  * under the terms of the GNU General Public License v2 as published by the
  9  * Free Software Foundation.
 10  *
 11  * This program is distributed in the hope that it will be useful, but WITHOUT
 12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 14  * more details.
 15  *
 16  * You should have received a copy of the GNU General Public License along with
 17  * this program; if not, write to the Free Software Foundation, Inc.,
 18  * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
 19  */
 20 
 21 #include <linux/kernel.h>
 22 #include <linux/module.h>
 23 #include <linux/platform_device.h>
 24 #include <linux/err.h>
 25 #include <linux/hwmon.h>
 26 #include <linux/hwmon-sysfs.h>
 27 #include <linux/slab.h>
 28 
 29 #include <linux/mfd/wm831x/core.h>
 30 #include <linux/mfd/wm831x/auxadc.h>
 31 
 32 static const char * const input_names[] = {
 33         [WM831X_AUX_SYSVDD]    = "SYSVDD",
 34         [WM831X_AUX_USB]       = "USB",
 35         [WM831X_AUX_BKUP_BATT] = "Backup battery",
 36         [WM831X_AUX_BATT]      = "Battery",
 37         [WM831X_AUX_WALL]      = "WALL",
 38         [WM831X_AUX_CHIP_TEMP] = "PMIC",
 39         [WM831X_AUX_BATT_TEMP] = "Battery",
 40 };
 41 
 42 static ssize_t show_voltage(struct device *dev,
 43                             struct device_attribute *attr, char *buf)
 44 {
 45         struct wm831x *wm831x = dev_get_drvdata(dev);
 46         int channel = to_sensor_dev_attr(attr)->index;
 47         int ret;
 48 
 49         ret = wm831x_auxadc_read_uv(wm831x, channel);
 50         if (ret < 0)
 51                 return ret;
 52 
 53         return sprintf(buf, "%d\n", DIV_ROUND_CLOSEST(ret, 1000));
 54 }
 55 
 56 static ssize_t show_chip_temp(struct device *dev,
 57                               struct device_attribute *attr, char *buf)
 58 {
 59         struct wm831x *wm831x = dev_get_drvdata(dev);
 60         int channel = to_sensor_dev_attr(attr)->index;
 61         int ret;
 62 
 63         ret = wm831x_auxadc_read(wm831x, channel);
 64         if (ret < 0)
 65                 return ret;
 66 
 67         /* Degrees celsius = (512.18-ret) / 1.0983 */
 68         ret = 512180 - (ret * 1000);
 69         ret = DIV_ROUND_CLOSEST(ret * 10000, 10983);
 70 
 71         return sprintf(buf, "%d\n", ret);
 72 }
 73 
 74 static ssize_t show_label(struct device *dev,
 75                           struct device_attribute *attr, char *buf)
 76 {
 77         int channel = to_sensor_dev_attr(attr)->index;
 78 
 79         return sprintf(buf, "%s\n", input_names[channel]);
 80 }
 81 
 82 #define WM831X_VOLTAGE(id, name) \
 83         static SENSOR_DEVICE_ATTR(in##id##_input, S_IRUGO, show_voltage, \
 84                                   NULL, name)
 85 
 86 #define WM831X_NAMED_VOLTAGE(id, name) \
 87         WM831X_VOLTAGE(id, name); \
 88         static SENSOR_DEVICE_ATTR(in##id##_label, S_IRUGO, show_label,  \
 89                                   NULL, name)
 90 
 91 WM831X_VOLTAGE(0, WM831X_AUX_AUX1);
 92 WM831X_VOLTAGE(1, WM831X_AUX_AUX2);
 93 WM831X_VOLTAGE(2, WM831X_AUX_AUX3);
 94 WM831X_VOLTAGE(3, WM831X_AUX_AUX4);
 95 
 96 WM831X_NAMED_VOLTAGE(4, WM831X_AUX_SYSVDD);
 97 WM831X_NAMED_VOLTAGE(5, WM831X_AUX_USB);
 98 WM831X_NAMED_VOLTAGE(6, WM831X_AUX_BATT);
 99 WM831X_NAMED_VOLTAGE(7, WM831X_AUX_WALL);
100 WM831X_NAMED_VOLTAGE(8, WM831X_AUX_BKUP_BATT);
101 
102 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_chip_temp, NULL,
103                           WM831X_AUX_CHIP_TEMP);
104 static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_label, NULL,
105                           WM831X_AUX_CHIP_TEMP);
106 /*
107  * Report as a voltage since conversion depends on external components
108  * and that's what the ABI wants.
109  */
110 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_voltage, NULL,
111                           WM831X_AUX_BATT_TEMP);
112 static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, show_label, NULL,
113                           WM831X_AUX_BATT_TEMP);
114 
115 static struct attribute *wm831x_attrs[] = {
116         &sensor_dev_attr_in0_input.dev_attr.attr,
117         &sensor_dev_attr_in1_input.dev_attr.attr,
118         &sensor_dev_attr_in2_input.dev_attr.attr,
119         &sensor_dev_attr_in3_input.dev_attr.attr,
120 
121         &sensor_dev_attr_in4_input.dev_attr.attr,
122         &sensor_dev_attr_in4_label.dev_attr.attr,
123         &sensor_dev_attr_in5_input.dev_attr.attr,
124         &sensor_dev_attr_in5_label.dev_attr.attr,
125         &sensor_dev_attr_in6_input.dev_attr.attr,
126         &sensor_dev_attr_in6_label.dev_attr.attr,
127         &sensor_dev_attr_in7_input.dev_attr.attr,
128         &sensor_dev_attr_in7_label.dev_attr.attr,
129         &sensor_dev_attr_in8_input.dev_attr.attr,
130         &sensor_dev_attr_in8_label.dev_attr.attr,
131 
132         &sensor_dev_attr_temp1_input.dev_attr.attr,
133         &sensor_dev_attr_temp1_label.dev_attr.attr,
134         &sensor_dev_attr_temp2_input.dev_attr.attr,
135         &sensor_dev_attr_temp2_label.dev_attr.attr,
136 
137         NULL
138 };
139 
140 ATTRIBUTE_GROUPS(wm831x);
141 
142 static int wm831x_hwmon_probe(struct platform_device *pdev)
143 {
144         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
145         struct device *hwmon_dev;
146 
147         hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev, "wm831x",
148                                                            wm831x,
149                                                            wm831x_groups);
150         return PTR_ERR_OR_ZERO(hwmon_dev);
151 }
152 
153 static struct platform_driver wm831x_hwmon_driver = {
154         .probe = wm831x_hwmon_probe,
155         .driver = {
156                 .name = "wm831x-hwmon",
157                 .owner = THIS_MODULE,
158         },
159 };
160 
161 module_platform_driver(wm831x_hwmon_driver);
162 
163 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
164 MODULE_DESCRIPTION("WM831x Hardware Monitoring");
165 MODULE_LICENSE("GPL");
166 MODULE_ALIAS("platform:wm831x-hwmon");
167 

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