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 | |
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(parent: &ucb->dev, name: "gpio-keys" , id: -1, |
61 | data: &keys, size: sizeof(keys)); |
62 | |
63 | device_create_file(device: &ucb->dev, entry: &dev_attr_vbatt); |
64 | device_create_file(device: &ucb->dev, entry: &dev_attr_vcharger); |
65 | device_create_file(device: &ucb->dev, entry: &dev_attr_batt_temp); |
66 | |
67 | dev->priv = pdev; |
68 | return 0; |
69 | } |
70 | |
71 | static void ucb1x00_assabet_remove(struct ucb1x00_dev *dev) |
72 | { |
73 | struct platform_device *pdev = dev->priv; |
74 | |
75 | if (!IS_ERR(ptr: pdev)) |
76 | platform_device_unregister(pdev); |
77 | |
78 | device_remove_file(dev: &dev->ucb->dev, attr: &dev_attr_batt_temp); |
79 | device_remove_file(dev: &dev->ucb->dev, attr: &dev_attr_vcharger); |
80 | device_remove_file(dev: &dev->ucb->dev, attr: &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 | |
88 | static int __init ucb1x00_assabet_init(void) |
89 | { |
90 | return ucb1x00_register_driver(&ucb1x00_assabet_driver); |
91 | } |
92 | |
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 | |