Mark Brown | 08bad5a | 2009-07-28 15:52:22 +0100 | [diff] [blame] | 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> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 27 | #include <linux/slab.h> |
Mark Brown | 08bad5a | 2009-07-28 15:52:22 +0100 | [diff] [blame] | 28 | |
| 29 | #include <linux/mfd/wm831x/core.h> |
| 30 | #include <linux/mfd/wm831x/auxadc.h> |
| 31 | |
| 32 | struct wm831x_hwmon { |
| 33 | struct wm831x *wm831x; |
| 34 | struct device *classdev; |
| 35 | }; |
| 36 | |
| 37 | static ssize_t show_name(struct device *dev, |
| 38 | struct device_attribute *attr, char *buf) |
| 39 | { |
| 40 | return sprintf(buf, "wm831x\n"); |
| 41 | } |
| 42 | |
Frans Meulenbroeks | a6100f6 | 2012-01-08 19:34:19 +0100 | [diff] [blame] | 43 | static const char * const input_names[] = { |
Mark Brown | 08bad5a | 2009-07-28 15:52:22 +0100 | [diff] [blame] | 44 | [WM831X_AUX_SYSVDD] = "SYSVDD", |
| 45 | [WM831X_AUX_USB] = "USB", |
| 46 | [WM831X_AUX_BKUP_BATT] = "Backup battery", |
| 47 | [WM831X_AUX_BATT] = "Battery", |
| 48 | [WM831X_AUX_WALL] = "WALL", |
| 49 | [WM831X_AUX_CHIP_TEMP] = "PMIC", |
| 50 | [WM831X_AUX_BATT_TEMP] = "Battery", |
| 51 | }; |
| 52 | |
| 53 | |
| 54 | static ssize_t show_voltage(struct device *dev, |
| 55 | struct device_attribute *attr, char *buf) |
| 56 | { |
| 57 | struct wm831x_hwmon *hwmon = dev_get_drvdata(dev); |
| 58 | int channel = to_sensor_dev_attr(attr)->index; |
| 59 | int ret; |
| 60 | |
| 61 | ret = wm831x_auxadc_read_uv(hwmon->wm831x, channel); |
| 62 | if (ret < 0) |
| 63 | return ret; |
| 64 | |
| 65 | return sprintf(buf, "%d\n", DIV_ROUND_CLOSEST(ret, 1000)); |
| 66 | } |
| 67 | |
| 68 | static ssize_t show_chip_temp(struct device *dev, |
| 69 | struct device_attribute *attr, char *buf) |
| 70 | { |
| 71 | struct wm831x_hwmon *hwmon = dev_get_drvdata(dev); |
| 72 | int channel = to_sensor_dev_attr(attr)->index; |
| 73 | int ret; |
| 74 | |
| 75 | ret = wm831x_auxadc_read(hwmon->wm831x, channel); |
| 76 | if (ret < 0) |
| 77 | return ret; |
| 78 | |
| 79 | /* Degrees celsius = (512.18-ret) / 1.0983 */ |
| 80 | ret = 512180 - (ret * 1000); |
| 81 | ret = DIV_ROUND_CLOSEST(ret * 10000, 10983); |
| 82 | |
| 83 | return sprintf(buf, "%d\n", ret); |
| 84 | } |
| 85 | |
| 86 | static ssize_t show_label(struct device *dev, |
| 87 | struct device_attribute *attr, char *buf) |
| 88 | { |
| 89 | int channel = to_sensor_dev_attr(attr)->index; |
| 90 | |
| 91 | return sprintf(buf, "%s\n", input_names[channel]); |
| 92 | } |
| 93 | |
| 94 | #define WM831X_VOLTAGE(id, name) \ |
| 95 | static SENSOR_DEVICE_ATTR(in##id##_input, S_IRUGO, show_voltage, \ |
| 96 | NULL, name) |
| 97 | |
| 98 | #define WM831X_NAMED_VOLTAGE(id, name) \ |
| 99 | WM831X_VOLTAGE(id, name); \ |
| 100 | static SENSOR_DEVICE_ATTR(in##id##_label, S_IRUGO, show_label, \ |
| 101 | NULL, name) |
| 102 | |
| 103 | static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); |
| 104 | |
| 105 | WM831X_VOLTAGE(0, WM831X_AUX_AUX1); |
| 106 | WM831X_VOLTAGE(1, WM831X_AUX_AUX2); |
| 107 | WM831X_VOLTAGE(2, WM831X_AUX_AUX3); |
| 108 | WM831X_VOLTAGE(3, WM831X_AUX_AUX4); |
| 109 | |
| 110 | WM831X_NAMED_VOLTAGE(4, WM831X_AUX_SYSVDD); |
| 111 | WM831X_NAMED_VOLTAGE(5, WM831X_AUX_USB); |
| 112 | WM831X_NAMED_VOLTAGE(6, WM831X_AUX_BATT); |
| 113 | WM831X_NAMED_VOLTAGE(7, WM831X_AUX_WALL); |
| 114 | WM831X_NAMED_VOLTAGE(8, WM831X_AUX_BKUP_BATT); |
| 115 | |
| 116 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_chip_temp, NULL, |
| 117 | WM831X_AUX_CHIP_TEMP); |
| 118 | static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_label, NULL, |
| 119 | WM831X_AUX_CHIP_TEMP); |
Guenter Roeck | 07de3df | 2012-01-19 11:02:28 -0800 | [diff] [blame] | 120 | /* |
| 121 | * Report as a voltage since conversion depends on external components |
| 122 | * and that's what the ABI wants. |
| 123 | */ |
Mark Brown | 08bad5a | 2009-07-28 15:52:22 +0100 | [diff] [blame] | 124 | static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_voltage, NULL, |
| 125 | WM831X_AUX_BATT_TEMP); |
| 126 | static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, show_label, NULL, |
| 127 | WM831X_AUX_BATT_TEMP); |
| 128 | |
| 129 | static struct attribute *wm831x_attributes[] = { |
| 130 | &dev_attr_name.attr, |
| 131 | |
| 132 | &sensor_dev_attr_in0_input.dev_attr.attr, |
| 133 | &sensor_dev_attr_in1_input.dev_attr.attr, |
| 134 | &sensor_dev_attr_in2_input.dev_attr.attr, |
| 135 | &sensor_dev_attr_in3_input.dev_attr.attr, |
| 136 | |
| 137 | &sensor_dev_attr_in4_input.dev_attr.attr, |
| 138 | &sensor_dev_attr_in4_label.dev_attr.attr, |
| 139 | &sensor_dev_attr_in5_input.dev_attr.attr, |
| 140 | &sensor_dev_attr_in5_label.dev_attr.attr, |
| 141 | &sensor_dev_attr_in6_input.dev_attr.attr, |
| 142 | &sensor_dev_attr_in6_label.dev_attr.attr, |
| 143 | &sensor_dev_attr_in7_input.dev_attr.attr, |
| 144 | &sensor_dev_attr_in7_label.dev_attr.attr, |
| 145 | &sensor_dev_attr_in8_input.dev_attr.attr, |
| 146 | &sensor_dev_attr_in8_label.dev_attr.attr, |
| 147 | |
| 148 | &sensor_dev_attr_temp1_input.dev_attr.attr, |
| 149 | &sensor_dev_attr_temp1_label.dev_attr.attr, |
| 150 | &sensor_dev_attr_temp2_input.dev_attr.attr, |
| 151 | &sensor_dev_attr_temp2_label.dev_attr.attr, |
| 152 | |
| 153 | NULL |
| 154 | }; |
| 155 | |
| 156 | static const struct attribute_group wm831x_attr_group = { |
| 157 | .attrs = wm831x_attributes, |
| 158 | }; |
| 159 | |
| 160 | static int __devinit wm831x_hwmon_probe(struct platform_device *pdev) |
| 161 | { |
| 162 | struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); |
| 163 | struct wm831x_hwmon *hwmon; |
| 164 | int ret; |
| 165 | |
Guenter Roeck | e7d5bf7 | 2012-06-02 11:48:02 -0700 | [diff] [blame^] | 166 | hwmon = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_hwmon), |
| 167 | GFP_KERNEL); |
Mark Brown | 08bad5a | 2009-07-28 15:52:22 +0100 | [diff] [blame] | 168 | if (!hwmon) |
| 169 | return -ENOMEM; |
| 170 | |
| 171 | hwmon->wm831x = wm831x; |
| 172 | |
| 173 | ret = sysfs_create_group(&pdev->dev.kobj, &wm831x_attr_group); |
| 174 | if (ret) |
Guenter Roeck | e7d5bf7 | 2012-06-02 11:48:02 -0700 | [diff] [blame^] | 175 | return ret; |
Mark Brown | 08bad5a | 2009-07-28 15:52:22 +0100 | [diff] [blame] | 176 | |
| 177 | hwmon->classdev = hwmon_device_register(&pdev->dev); |
| 178 | if (IS_ERR(hwmon->classdev)) { |
| 179 | ret = PTR_ERR(hwmon->classdev); |
| 180 | goto err_sysfs; |
| 181 | } |
| 182 | |
| 183 | platform_set_drvdata(pdev, hwmon); |
| 184 | |
| 185 | return 0; |
| 186 | |
| 187 | err_sysfs: |
| 188 | sysfs_remove_group(&pdev->dev.kobj, &wm831x_attr_group); |
Mark Brown | 08bad5a | 2009-07-28 15:52:22 +0100 | [diff] [blame] | 189 | return ret; |
| 190 | } |
| 191 | |
| 192 | static int __devexit wm831x_hwmon_remove(struct platform_device *pdev) |
| 193 | { |
| 194 | struct wm831x_hwmon *hwmon = platform_get_drvdata(pdev); |
| 195 | |
| 196 | hwmon_device_unregister(hwmon->classdev); |
| 197 | sysfs_remove_group(&pdev->dev.kobj, &wm831x_attr_group); |
Mark Brown | 08bad5a | 2009-07-28 15:52:22 +0100 | [diff] [blame] | 198 | |
| 199 | return 0; |
| 200 | } |
| 201 | |
| 202 | static struct platform_driver wm831x_hwmon_driver = { |
| 203 | .probe = wm831x_hwmon_probe, |
| 204 | .remove = __devexit_p(wm831x_hwmon_remove), |
| 205 | .driver = { |
| 206 | .name = "wm831x-hwmon", |
| 207 | .owner = THIS_MODULE, |
| 208 | }, |
| 209 | }; |
| 210 | |
Axel Lin | 25a236a | 2011-11-25 02:31:00 -0500 | [diff] [blame] | 211 | module_platform_driver(wm831x_hwmon_driver); |
Mark Brown | 08bad5a | 2009-07-28 15:52:22 +0100 | [diff] [blame] | 212 | |
| 213 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); |
| 214 | MODULE_DESCRIPTION("WM831x Hardware Monitoring"); |
| 215 | MODULE_LICENSE("GPL"); |
| 216 | MODULE_ALIAS("platform:wm831x-hwmon"); |