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authorMark Brown <broonie@opensource.wolfsonmicro.com>2009-07-28 10:52:22 -0400
committerSamuel Ortiz <sameo@linux.intel.com>2009-09-17 03:47:02 -0400
commit08bad5a821371548942aa13565831f18fe1875f3 (patch)
tree9b689f0bc2ab63700909b9b3af19cee0c7aa1dbd /drivers/hwmon
parente4b736f18f338daae141325c818187c4ab3e244c (diff)
hwmon: WM831x PMIC hardware monitoring driver
This driver adds support for the hardware monitoring features of the WM831x PMICs to the hwmon API. Monitoring is provided for the system voltages supported natively by the WM831x, the chip temperature, the battery temperature and the auxiliary inputs of the WM831x. Currently no alarms are supported, though digital comparators on the WM831x devices would allow these to be provided. Since the auxiliary and battery temperature input scaling depends on the system configuration the value is reported as a voltage to userspace. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Acked-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Diffstat (limited to 'drivers/hwmon')
-rw-r--r--drivers/hwmon/Kconfig11
-rw-r--r--drivers/hwmon/Makefile1
-rw-r--r--drivers/hwmon/wm831x-hwmon.c226
3 files changed, 238 insertions, 0 deletions
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 120085ce651..83e07e55a78 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -937,6 +937,17 @@ config SENSORS_W83627EHF
937 This driver can also be built as a module. If so, the module 937 This driver can also be built as a module. If so, the module
938 will be called w83627ehf. 938 will be called w83627ehf.
939 939
940config SENSORS_WM831X
941 tristate "WM831x PMICs"
942 depends on MFD_WM831X
943 help
944 If you say yes here you get support for the hardware
945 monitoring functionality of the Wolfson Microelectronics
946 WM831x series of PMICs.
947
948 This driver can also be built as a module. If so, the module
949 will be called wm831x-hwmon.
950
940config SENSORS_WM8350 951config SENSORS_WM8350
941 tristate "Wolfson Microelectronics WM835x" 952 tristate "Wolfson Microelectronics WM835x"
942 depends on MFD_WM8350 953 depends on MFD_WM8350
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index ed5f1781b8c..c5effd609ab 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -90,6 +90,7 @@ obj-$(CONFIG_SENSORS_VT8231) += vt8231.o
90obj-$(CONFIG_SENSORS_W83627EHF) += w83627ehf.o 90obj-$(CONFIG_SENSORS_W83627EHF) += w83627ehf.o
91obj-$(CONFIG_SENSORS_W83L785TS) += w83l785ts.o 91obj-$(CONFIG_SENSORS_W83L785TS) += w83l785ts.o
92obj-$(CONFIG_SENSORS_W83L786NG) += w83l786ng.o 92obj-$(CONFIG_SENSORS_W83L786NG) += w83l786ng.o
93obj-$(CONFIG_SENSORS_WM831X) += wm831x-hwmon.o
93obj-$(CONFIG_SENSORS_WM8350) += wm8350-hwmon.o 94obj-$(CONFIG_SENSORS_WM8350) += wm8350-hwmon.o
94 95
95ifeq ($(CONFIG_HWMON_DEBUG_CHIP),y) 96ifeq ($(CONFIG_HWMON_DEBUG_CHIP),y)
diff --git a/drivers/hwmon/wm831x-hwmon.c b/drivers/hwmon/wm831x-hwmon.c
new file mode 100644
index 00000000000..c16e9e74c35
--- /dev/null
+++ b/drivers/hwmon/wm831x-hwmon.c
@@ -0,0 +1,226 @@
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
28#include <linux/mfd/wm831x/core.h>
29#include <linux/mfd/wm831x/auxadc.h>
30
31struct wm831x_hwmon {
32 struct wm831x *wm831x;
33 struct device *classdev;
34};
35
36static ssize_t show_name(struct device *dev,
37 struct device_attribute *attr, char *buf)
38{
39 return sprintf(buf, "wm831x\n");
40}
41
42static const char *input_names[] = {
43 [WM831X_AUX_SYSVDD] = "SYSVDD",
44 [WM831X_AUX_USB] = "USB",
45 [WM831X_AUX_BKUP_BATT] = "Backup battery",
46 [WM831X_AUX_BATT] = "Battery",
47 [WM831X_AUX_WALL] = "WALL",
48 [WM831X_AUX_CHIP_TEMP] = "PMIC",
49 [WM831X_AUX_BATT_TEMP] = "Battery",
50};
51
52
53static ssize_t show_voltage(struct device *dev,
54 struct device_attribute *attr, char *buf)
55{
56 struct wm831x_hwmon *hwmon = dev_get_drvdata(dev);
57 int channel = to_sensor_dev_attr(attr)->index;
58 int ret;
59
60 ret = wm831x_auxadc_read_uv(hwmon->wm831x, channel);
61 if (ret < 0)
62 return ret;
63
64 return sprintf(buf, "%d\n", DIV_ROUND_CLOSEST(ret, 1000));
65}
66
67static ssize_t show_chip_temp(struct device *dev,
68 struct device_attribute *attr, char *buf)
69{
70 struct wm831x_hwmon *hwmon = dev_get_drvdata(dev);
71 int channel = to_sensor_dev_attr(attr)->index;
72 int ret;
73
74 ret = wm831x_auxadc_read(hwmon->wm831x, channel);
75 if (ret < 0)
76 return ret;
77
78 /* Degrees celsius = (512.18-ret) / 1.0983 */
79 ret = 512180 - (ret * 1000);
80 ret = DIV_ROUND_CLOSEST(ret * 10000, 10983);
81
82 return sprintf(buf, "%d\n", ret);
83}
84
85static ssize_t show_label(struct device *dev,
86 struct device_attribute *attr, char *buf)
87{
88 int channel = to_sensor_dev_attr(attr)->index;
89
90 return sprintf(buf, "%s\n", input_names[channel]);
91}
92
93#define WM831X_VOLTAGE(id, name) \
94 static SENSOR_DEVICE_ATTR(in##id##_input, S_IRUGO, show_voltage, \
95 NULL, name)
96
97#define WM831X_NAMED_VOLTAGE(id, name) \
98 WM831X_VOLTAGE(id, name); \
99 static SENSOR_DEVICE_ATTR(in##id##_label, S_IRUGO, show_label, \
100 NULL, name)
101
102static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
103
104WM831X_VOLTAGE(0, WM831X_AUX_AUX1);
105WM831X_VOLTAGE(1, WM831X_AUX_AUX2);
106WM831X_VOLTAGE(2, WM831X_AUX_AUX3);
107WM831X_VOLTAGE(3, WM831X_AUX_AUX4);
108
109WM831X_NAMED_VOLTAGE(4, WM831X_AUX_SYSVDD);
110WM831X_NAMED_VOLTAGE(5, WM831X_AUX_USB);
111WM831X_NAMED_VOLTAGE(6, WM831X_AUX_BATT);
112WM831X_NAMED_VOLTAGE(7, WM831X_AUX_WALL);
113WM831X_NAMED_VOLTAGE(8, WM831X_AUX_BKUP_BATT);
114
115static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_chip_temp, NULL,
116 WM831X_AUX_CHIP_TEMP);
117static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_label, NULL,
118 WM831X_AUX_CHIP_TEMP);
119/* Report as a voltage since conversion depends on external components
120 * and that's what the ABI wants. */
121static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_voltage, NULL,
122 WM831X_AUX_BATT_TEMP);
123static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, show_label, NULL,
124 WM831X_AUX_BATT_TEMP);
125
126static struct attribute *wm831x_attributes[] = {
127 &dev_attr_name.attr,
128
129 &sensor_dev_attr_in0_input.dev_attr.attr,
130 &sensor_dev_attr_in1_input.dev_attr.attr,
131 &sensor_dev_attr_in2_input.dev_attr.attr,
132 &sensor_dev_attr_in3_input.dev_attr.attr,
133
134 &sensor_dev_attr_in4_input.dev_attr.attr,
135 &sensor_dev_attr_in4_label.dev_attr.attr,
136 &sensor_dev_attr_in5_input.dev_attr.attr,
137 &sensor_dev_attr_in5_label.dev_attr.attr,
138 &sensor_dev_attr_in6_input.dev_attr.attr,
139 &sensor_dev_attr_in6_label.dev_attr.attr,
140 &sensor_dev_attr_in7_input.dev_attr.attr,
141 &sensor_dev_attr_in7_label.dev_attr.attr,
142 &sensor_dev_attr_in8_input.dev_attr.attr,
143 &sensor_dev_attr_in8_label.dev_attr.attr,
144
145 &sensor_dev_attr_temp1_input.dev_attr.attr,
146 &sensor_dev_attr_temp1_label.dev_attr.attr,
147 &sensor_dev_attr_temp2_input.dev_attr.attr,
148 &sensor_dev_attr_temp2_label.dev_attr.attr,
149
150 NULL
151};
152
153static const struct attribute_group wm831x_attr_group = {
154 .attrs = wm831x_attributes,
155};
156
157static int __devinit wm831x_hwmon_probe(struct platform_device *pdev)
158{
159 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
160 struct wm831x_hwmon *hwmon;
161 int ret;
162
163 hwmon = kzalloc(sizeof(struct wm831x_hwmon), GFP_KERNEL);
164 if (!hwmon)
165 return -ENOMEM;
166
167 hwmon->wm831x = wm831x;
168
169 ret = sysfs_create_group(&pdev->dev.kobj, &wm831x_attr_group);
170 if (ret)
171 goto err;
172
173 hwmon->classdev = hwmon_device_register(&pdev->dev);
174 if (IS_ERR(hwmon->classdev)) {
175 ret = PTR_ERR(hwmon->classdev);
176 goto err_sysfs;
177 }
178
179 platform_set_drvdata(pdev, hwmon);
180
181 return 0;
182
183err_sysfs:
184 sysfs_remove_group(&pdev->dev.kobj, &wm831x_attr_group);
185err:
186 kfree(hwmon);
187 return ret;
188}
189
190static int __devexit wm831x_hwmon_remove(struct platform_device *pdev)
191{
192 struct wm831x_hwmon *hwmon = platform_get_drvdata(pdev);
193
194 hwmon_device_unregister(hwmon->classdev);
195 sysfs_remove_group(&pdev->dev.kobj, &wm831x_attr_group);
196 platform_set_drvdata(pdev, NULL);
197 kfree(hwmon);
198
199 return 0;
200}
201
202static 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
211static int __init wm831x_hwmon_init(void)
212{
213 return platform_driver_register(&wm831x_hwmon_driver);
214}
215module_init(wm831x_hwmon_init);
216
217static void __exit wm831x_hwmon_exit(void)
218{
219 platform_driver_unregister(&wm831x_hwmon_driver);
220}
221module_exit(wm831x_hwmon_exit);
222
223MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
224MODULE_DESCRIPTION("WM831x Hardware Monitoring");
225MODULE_LICENSE("GPL");
226MODULE_ALIAS("platform:wm831x-hwmon");