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0070bddf K |
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 | long val; | |
49 | ||
50 | req.channels = (1 << attr->index); | |
51 | req.method = TWL4030_MADC_SW2; | |
52 | req.func_cb = NULL; | |
53 | val = twl4030_madc_conversion(&req); | |
54 | if (val < 0) | |
55 | return val; | |
56 | ||
57 | return sprintf(buf, "%d\n", req.rbuf[attr->index]); | |
58 | } | |
59 | ||
60 | /* sysfs nodes to read individual channels from user side */ | |
61 | static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, madc_read, NULL, 0); | |
62 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, madc_read, NULL, 1); | |
63 | static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, madc_read, NULL, 2); | |
64 | static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, madc_read, NULL, 3); | |
65 | static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, madc_read, NULL, 4); | |
66 | static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, madc_read, NULL, 5); | |
67 | static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, madc_read, NULL, 6); | |
68 | static SENSOR_DEVICE_ATTR(in7_input, S_IRUGO, madc_read, NULL, 7); | |
69 | static SENSOR_DEVICE_ATTR(in8_input, S_IRUGO, madc_read, NULL, 8); | |
70 | static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, madc_read, NULL, 9); | |
71 | static SENSOR_DEVICE_ATTR(curr10_input, S_IRUGO, madc_read, NULL, 10); | |
72 | static SENSOR_DEVICE_ATTR(in11_input, S_IRUGO, madc_read, NULL, 11); | |
73 | static SENSOR_DEVICE_ATTR(in12_input, S_IRUGO, madc_read, NULL, 12); | |
74 | static SENSOR_DEVICE_ATTR(in15_input, S_IRUGO, madc_read, NULL, 15); | |
75 | ||
76 | static struct attribute *twl4030_madc_attributes[] = { | |
77 | &sensor_dev_attr_in0_input.dev_attr.attr, | |
78 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
79 | &sensor_dev_attr_in2_input.dev_attr.attr, | |
80 | &sensor_dev_attr_in3_input.dev_attr.attr, | |
81 | &sensor_dev_attr_in4_input.dev_attr.attr, | |
82 | &sensor_dev_attr_in5_input.dev_attr.attr, | |
83 | &sensor_dev_attr_in6_input.dev_attr.attr, | |
84 | &sensor_dev_attr_in7_input.dev_attr.attr, | |
85 | &sensor_dev_attr_in8_input.dev_attr.attr, | |
86 | &sensor_dev_attr_in9_input.dev_attr.attr, | |
87 | &sensor_dev_attr_curr10_input.dev_attr.attr, | |
88 | &sensor_dev_attr_in11_input.dev_attr.attr, | |
89 | &sensor_dev_attr_in12_input.dev_attr.attr, | |
90 | &sensor_dev_attr_in15_input.dev_attr.attr, | |
91 | NULL | |
92 | }; | |
93 | ||
94 | static const struct attribute_group twl4030_madc_group = { | |
95 | .attrs = twl4030_madc_attributes, | |
96 | }; | |
97 | ||
98 | static int __devinit twl4030_madc_hwmon_probe(struct platform_device *pdev) | |
99 | { | |
100 | int ret; | |
0070bddf K |
101 | struct device *hwmon; |
102 | ||
103 | ret = sysfs_create_group(&pdev->dev.kobj, &twl4030_madc_group); | |
104 | if (ret) | |
105 | goto err_sysfs; | |
106 | hwmon = hwmon_device_register(&pdev->dev); | |
107 | if (IS_ERR(hwmon)) { | |
108 | dev_err(&pdev->dev, "hwmon_device_register failed.\n"); | |
c30aa39c | 109 | ret = PTR_ERR(hwmon); |
0070bddf K |
110 | goto err_reg; |
111 | } | |
112 | ||
113 | return 0; | |
114 | ||
115 | err_reg: | |
116 | sysfs_remove_group(&pdev->dev.kobj, &twl4030_madc_group); | |
117 | err_sysfs: | |
118 | ||
119 | return ret; | |
120 | } | |
121 | ||
122 | static int __devexit twl4030_madc_hwmon_remove(struct platform_device *pdev) | |
123 | { | |
124 | hwmon_device_unregister(&pdev->dev); | |
125 | sysfs_remove_group(&pdev->dev.kobj, &twl4030_madc_group); | |
126 | ||
127 | return 0; | |
128 | } | |
129 | ||
130 | static struct platform_driver twl4030_madc_hwmon_driver = { | |
131 | .probe = twl4030_madc_hwmon_probe, | |
132 | .remove = __exit_p(twl4030_madc_hwmon_remove), | |
133 | .driver = { | |
134 | .name = "twl4030_madc_hwmon", | |
135 | .owner = THIS_MODULE, | |
136 | }, | |
137 | }; | |
138 | ||
139 | static int __init twl4030_madc_hwmon_init(void) | |
140 | { | |
141 | return platform_driver_register(&twl4030_madc_hwmon_driver); | |
142 | } | |
143 | ||
144 | module_init(twl4030_madc_hwmon_init); | |
145 | ||
146 | static void __exit twl4030_madc_hwmon_exit(void) | |
147 | { | |
148 | platform_driver_unregister(&twl4030_madc_hwmon_driver); | |
149 | } | |
150 | ||
151 | module_exit(twl4030_madc_hwmon_exit); | |
152 | ||
153 | MODULE_DESCRIPTION("TWL4030 ADC Hwmon driver"); | |
154 | MODULE_LICENSE("GPL"); | |
155 | MODULE_AUTHOR("J Keerthy"); | |
c4757ee5 | 156 | MODULE_ALIAS("platform:twl4030_madc_hwmon"); |