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1 | /* |
2 | * |
3 | * TWL4030 MADC Hwmon driver-This driver monitors the real time |
4 | * conversion of analog signals like battery temperature, |
5 | * battery type, battery level etc. User can ask for the conversion on a |
6 | * particular channel using the sysfs nodes. |
7 | * |
8 | * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/ |
9 | * J Keerthy <j-keerthy@ti.com> |
10 | * |
11 | * This program is free software; you can redistribute it and/or |
12 | * modify it under the terms of the GNU General Public License |
13 | * version 2 as published by the Free Software Foundation. |
14 | * |
15 | * This program is distributed in the hope that it will be useful, but |
16 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
18 | * General Public License for more details. |
19 | * |
20 | * You should have received a copy of the GNU General Public License |
21 | * along with this program; if not, write to the Free Software |
22 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA |
23 | * 02110-1301 USA |
24 | * |
25 | */ |
26 | #include <linux/init.h> |
27 | #include <linux/module.h> |
28 | #include <linux/kernel.h> |
29 | #include <linux/i2c/twl.h> |
30 | #include <linux/device.h> |
31 | #include <linux/platform_device.h> |
32 | #include <linux/i2c/twl4030-madc.h> |
33 | #include <linux/hwmon.h> |
34 | #include <linux/hwmon-sysfs.h> |
35 | #include <linux/stddef.h> |
36 | #include <linux/sysfs.h> |
37 | #include <linux/err.h> |
38 | #include <linux/types.h> |
39 | |
40 | /* |
41 | * sysfs hook function |
42 | */ |
43 | static ssize_t madc_read(struct device *dev, |
44 | struct device_attribute *devattr, char *buf) |
45 | { |
46 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
47 | struct twl4030_madc_request req = { |
48 | .channels = 1 << attr->index, |
49 | .method = TWL4030_MADC_SW2, |
50 | .type = TWL4030_MADC_WAIT, |
51 | }; |
52 | long val; |
53 | |
54 | val = twl4030_madc_conversion(&req); |
55 | if (val < 0) |
56 | return val; |
57 | |
58 | return sprintf(buf, "%d\n", req.rbuf[attr->index]); |
59 | } |
60 | |
61 | /* sysfs nodes to read individual channels from user side */ |
62 | static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, madc_read, NULL, 0); |
63 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, madc_read, NULL, 1); |
64 | static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, madc_read, NULL, 2); |
65 | static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, madc_read, NULL, 3); |
66 | static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, madc_read, NULL, 4); |
67 | static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, madc_read, NULL, 5); |
68 | static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, madc_read, NULL, 6); |
69 | static SENSOR_DEVICE_ATTR(in7_input, S_IRUGO, madc_read, NULL, 7); |
70 | static SENSOR_DEVICE_ATTR(in8_input, S_IRUGO, madc_read, NULL, 8); |
71 | static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, madc_read, NULL, 9); |
72 | static SENSOR_DEVICE_ATTR(curr10_input, S_IRUGO, madc_read, NULL, 10); |
73 | static SENSOR_DEVICE_ATTR(in11_input, S_IRUGO, madc_read, NULL, 11); |
74 | static SENSOR_DEVICE_ATTR(in12_input, S_IRUGO, madc_read, NULL, 12); |
75 | static SENSOR_DEVICE_ATTR(in15_input, S_IRUGO, madc_read, NULL, 15); |
76 | |
77 | static struct attribute *twl4030_madc_attributes[] = { |
78 | &sensor_dev_attr_in0_input.dev_attr.attr, |
79 | &sensor_dev_attr_temp1_input.dev_attr.attr, |
80 | &sensor_dev_attr_in2_input.dev_attr.attr, |
81 | &sensor_dev_attr_in3_input.dev_attr.attr, |
82 | &sensor_dev_attr_in4_input.dev_attr.attr, |
83 | &sensor_dev_attr_in5_input.dev_attr.attr, |
84 | &sensor_dev_attr_in6_input.dev_attr.attr, |
85 | &sensor_dev_attr_in7_input.dev_attr.attr, |
86 | &sensor_dev_attr_in8_input.dev_attr.attr, |
87 | &sensor_dev_attr_in9_input.dev_attr.attr, |
88 | &sensor_dev_attr_curr10_input.dev_attr.attr, |
89 | &sensor_dev_attr_in11_input.dev_attr.attr, |
90 | &sensor_dev_attr_in12_input.dev_attr.attr, |
91 | &sensor_dev_attr_in15_input.dev_attr.attr, |
92 | NULL |
93 | }; |
94 | |
95 | static const struct attribute_group twl4030_madc_group = { |
96 | .attrs = twl4030_madc_attributes, |
97 | }; |
98 | |
99 | static int __devinit twl4030_madc_hwmon_probe(struct platform_device *pdev) |
100 | { |
101 | int ret; |
102 | struct device *hwmon; |
103 | |
104 | ret = sysfs_create_group(&pdev->dev.kobj, &twl4030_madc_group); |
105 | if (ret) |
106 | goto err_sysfs; |
107 | hwmon = hwmon_device_register(&pdev->dev); |
108 | if (IS_ERR(hwmon)) { |
109 | dev_err(&pdev->dev, "hwmon_device_register failed.\n"); |
110 | ret = PTR_ERR(hwmon); |
111 | goto err_reg; |
112 | } |
113 | |
114 | return 0; |
115 | |
116 | err_reg: |
117 | sysfs_remove_group(&pdev->dev.kobj, &twl4030_madc_group); |
118 | err_sysfs: |
119 | |
120 | return ret; |
121 | } |
122 | |
123 | static int __devexit twl4030_madc_hwmon_remove(struct platform_device *pdev) |
124 | { |
125 | hwmon_device_unregister(&pdev->dev); |
126 | sysfs_remove_group(&pdev->dev.kobj, &twl4030_madc_group); |
127 | |
128 | return 0; |
129 | } |
130 | |
131 | static struct platform_driver twl4030_madc_hwmon_driver = { |
132 | .probe = twl4030_madc_hwmon_probe, |
133 | .remove = __exit_p(twl4030_madc_hwmon_remove), |
134 | .driver = { |
135 | .name = "twl4030_madc_hwmon", |
136 | .owner = THIS_MODULE, |
137 | }, |
138 | }; |
139 | |
140 | module_platform_driver(twl4030_madc_hwmon_driver); |
141 | |
142 | MODULE_DESCRIPTION("TWL4030 ADC Hwmon driver"); |
143 | MODULE_LICENSE("GPL"); |
144 | MODULE_AUTHOR("J Keerthy"); |
145 | MODULE_ALIAS("platform:twl4030_madc_hwmon"); |
146 |
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