xref: /openbmc/linux/drivers/mfd/ucb1x00-assabet.c (revision 47ed390b)
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