GNU Linux-libre 4.4.289-gnu1
[releases.git] / drivers / mfd / ucb1x00-assabet.c
1 /*
2  *  linux/drivers/mfd/ucb1x00-assabet.c
3  *
4  *  Copyright (C) 2001-2003 Russell King, All Rights Reserved.
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 2 of the License.
9  *
10  *  We handle the machine-specific bits of the UCB1x00 driver here.
11  */
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/device.h>
15 #include <linux/err.h>
16 #include <linux/fs.h>
17 #include <linux/gpio_keys.h>
18 #include <linux/input.h>
19 #include <linux/platform_device.h>
20 #include <linux/proc_fs.h>
21 #include <linux/mfd/ucb1x00.h>
22
23 #define UCB1X00_ATTR(name,input)\
24 static ssize_t name##_show(struct device *dev, struct device_attribute *attr, \
25                            char *buf)   \
26 {                                                               \
27         struct ucb1x00 *ucb = classdev_to_ucb1x00(dev);         \
28         int val;                                                \
29         ucb1x00_adc_enable(ucb);                                \
30         val = ucb1x00_adc_read(ucb, input, UCB_NOSYNC);         \
31         ucb1x00_adc_disable(ucb);                               \
32         return sprintf(buf, "%d\n", val);                       \
33 }                                                               \
34 static DEVICE_ATTR(name,0444,name##_show,NULL)
35
36 UCB1X00_ATTR(vbatt, UCB_ADC_INP_AD1);
37 UCB1X00_ATTR(vcharger, UCB_ADC_INP_AD0);
38 UCB1X00_ATTR(batt_temp, UCB_ADC_INP_AD2);
39
40 static int ucb1x00_assabet_add(struct ucb1x00_dev *dev)
41 {
42         struct ucb1x00 *ucb = dev->ucb;
43         struct platform_device *pdev;
44         struct gpio_keys_platform_data keys;
45         static struct gpio_keys_button buttons[6];
46         unsigned i;
47
48         memset(buttons, 0, sizeof(buttons));
49         memset(&keys, 0, sizeof(keys));
50
51         for (i = 0; i < ARRAY_SIZE(buttons); i++) {
52                 buttons[i].code = BTN_0 + i;
53                 buttons[i].gpio = ucb->gpio.base + i;
54                 buttons[i].type = EV_KEY;
55                 buttons[i].can_disable = true;
56         }
57
58         keys.buttons = buttons;
59         keys.nbuttons = ARRAY_SIZE(buttons);
60         keys.poll_interval = 50;
61         keys.name = "ucb1x00";
62
63         pdev = platform_device_register_data(&ucb->dev, "gpio-keys", -1,
64                 &keys, sizeof(keys));
65
66         device_create_file(&ucb->dev, &dev_attr_vbatt);
67         device_create_file(&ucb->dev, &dev_attr_vcharger);
68         device_create_file(&ucb->dev, &dev_attr_batt_temp);
69
70         dev->priv = pdev;
71         return 0;
72 }
73
74 static void ucb1x00_assabet_remove(struct ucb1x00_dev *dev)
75 {
76         struct platform_device *pdev = dev->priv;
77
78         if (!IS_ERR(pdev))
79                 platform_device_unregister(pdev);
80
81         device_remove_file(&dev->ucb->dev, &dev_attr_batt_temp);
82         device_remove_file(&dev->ucb->dev, &dev_attr_vcharger);
83         device_remove_file(&dev->ucb->dev, &dev_attr_vbatt);
84 }
85
86 static struct ucb1x00_driver ucb1x00_assabet_driver = {
87         .add    = ucb1x00_assabet_add,
88         .remove = ucb1x00_assabet_remove,
89 };
90
91 static int __init ucb1x00_assabet_init(void)
92 {
93         return ucb1x00_register_driver(&ucb1x00_assabet_driver);
94 }
95
96 static void __exit ucb1x00_assabet_exit(void)
97 {
98         ucb1x00_unregister_driver(&ucb1x00_assabet_driver);
99 }
100
101 module_init(ucb1x00_assabet_init);
102 module_exit(ucb1x00_assabet_exit);
103
104 MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
105 MODULE_DESCRIPTION("Assabet noddy testing only example ADC driver");
106 MODULE_LICENSE("GPL");