1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * linux/drivers/mfd/ucb1x00-assabet.c
4 *
5 * Copyright (C) 2001-2003 Russell King, All Rights Reserved.
6 *
7 * We handle the machine-specific bits of the UCB1x00 driver here.
8 */
9 #include <linux/module.h>
10 #include <linux/init.h>
11 #include <linux/device.h>
12 #include <linux/err.h>
13 #include <linux/fs.h>
14 #include <linux/gpio_keys.h>
15 #include <linux/input.h>
16 #include <linux/platform_device.h>
17 #include <linux/proc_fs.h>
18 #include <linux/mfd/ucb1x00.h>
19
20 #define UCB1X00_ATTR(name,input)\
21 static ssize_t name##_show(struct device *dev, struct device_attribute *attr, \
22 char *buf) \
23 { \
24 struct ucb1x00 *ucb = classdev_to_ucb1x00(dev); \
25 int val; \
26 ucb1x00_adc_enable(ucb); \
27 val = ucb1x00_adc_read(ucb, input, UCB_NOSYNC); \
28 ucb1x00_adc_disable(ucb); \
29 return sprintf(buf, "%d\n", val); \
30 } \
31 static DEVICE_ATTR_RO(name)
32
33 UCB1X00_ATTR(vbatt, UCB_ADC_INP_AD1);
34 UCB1X00_ATTR(vcharger, UCB_ADC_INP_AD0);
35 UCB1X00_ATTR(batt_temp, UCB_ADC_INP_AD2);
36
ucb1x00_assabet_add(struct ucb1x00_dev * dev)37 static int ucb1x00_assabet_add(struct ucb1x00_dev *dev)
38 {
39 struct ucb1x00 *ucb = dev->ucb;
40 struct platform_device *pdev;
41 struct gpio_keys_platform_data keys;
42 static struct gpio_keys_button buttons[6];
43 unsigned i;
44
45 memset(buttons, 0, sizeof(buttons));
46 memset(&keys, 0, sizeof(keys));
47
48 for (i = 0; i < ARRAY_SIZE(buttons); i++) {
49 buttons[i].code = BTN_0 + i;
50 buttons[i].gpio = ucb->gpio.base + i;
51 buttons[i].type = EV_KEY;
52 buttons[i].can_disable = true;
53 }
54
55 keys.buttons = buttons;
56 keys.nbuttons = ARRAY_SIZE(buttons);
57 keys.poll_interval = 50;
58 keys.name = "ucb1x00";
59
60 pdev = platform_device_register_data(&ucb->dev, "gpio-keys", -1,
61 &keys, sizeof(keys));
62
63 device_create_file(&ucb->dev, &dev_attr_vbatt);
64 device_create_file(&ucb->dev, &dev_attr_vcharger);
65 device_create_file(&ucb->dev, &dev_attr_batt_temp);
66
67 dev->priv = pdev;
68 return 0;
69 }
70
ucb1x00_assabet_remove(struct ucb1x00_dev * dev)71 static void ucb1x00_assabet_remove(struct ucb1x00_dev *dev)
72 {
73 struct platform_device *pdev = dev->priv;
74
75 if (!IS_ERR(pdev))
76 platform_device_unregister(pdev);
77
78 device_remove_file(&dev->ucb->dev, &dev_attr_batt_temp);
79 device_remove_file(&dev->ucb->dev, &dev_attr_vcharger);
80 device_remove_file(&dev->ucb->dev, &dev_attr_vbatt);
81 }
82
83 static struct ucb1x00_driver ucb1x00_assabet_driver = {
84 .add = ucb1x00_assabet_add,
85 .remove = ucb1x00_assabet_remove,
86 };
87
ucb1x00_assabet_init(void)88 static int __init ucb1x00_assabet_init(void)
89 {
90 return ucb1x00_register_driver(&ucb1x00_assabet_driver);
91 }
92
ucb1x00_assabet_exit(void)93 static void __exit ucb1x00_assabet_exit(void)
94 {
95 ucb1x00_unregister_driver(&ucb1x00_assabet_driver);
96 }
97
98 module_init(ucb1x00_assabet_init);
99 module_exit(ucb1x00_assabet_exit);
100
101 MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
102 MODULE_DESCRIPTION("Assabet noddy testing only example ADC driver");
103 MODULE_LICENSE("GPL");
104