1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Keypad driver for Analog Devices ADP5520 MFD PMICs
4 *
5 * Copyright 2009 Analog Devices Inc.
6 */
7
8#include <linux/module.h>
9#include <linux/kernel.h>
10#include <linux/platform_device.h>
11#include <linux/input.h>
12#include <linux/mfd/adp5520.h>
13#include <linux/slab.h>
14#include <linux/device.h>
15
16struct adp5520_keys {
17	struct input_dev *input;
18	struct notifier_block notifier;
19	struct device *master;
20	unsigned short keycode[ADP5520_KEYMAPSIZE];
21};
22
23static void adp5520_keys_report_event(struct adp5520_keys *dev,
24					unsigned short keymask, int value)
25{
26	int i;
27
28	for (i = 0; i < ADP5520_MAXKEYS; i++)
29		if (keymask & (1 << i))
30			input_report_key(dev->input, dev->keycode[i], value);
31
32	input_sync(dev->input);
33}
34
35static int adp5520_keys_notifier(struct notifier_block *nb,
36				 unsigned long event, void *data)
37{
38	struct adp5520_keys *dev;
39	uint8_t reg_val_lo, reg_val_hi;
40	unsigned short keymask;
41
42	dev = container_of(nb, struct adp5520_keys, notifier);
43
44	if (event & ADP5520_KP_INT) {
45		adp5520_read(dev->master, ADP5520_KP_INT_STAT_1, &reg_val_lo);
46		adp5520_read(dev->master, ADP5520_KP_INT_STAT_2, &reg_val_hi);
47
48		keymask = (reg_val_hi << 8) | reg_val_lo;
49		/* Read twice to clear */
50		adp5520_read(dev->master, ADP5520_KP_INT_STAT_1, &reg_val_lo);
51		adp5520_read(dev->master, ADP5520_KP_INT_STAT_2, &reg_val_hi);
52		keymask |= (reg_val_hi << 8) | reg_val_lo;
53		adp5520_keys_report_event(dev, keymask, 1);
54	}
55
56	if (event & ADP5520_KR_INT) {
57		adp5520_read(dev->master, ADP5520_KR_INT_STAT_1, &reg_val_lo);
58		adp5520_read(dev->master, ADP5520_KR_INT_STAT_2, &reg_val_hi);
59
60		keymask = (reg_val_hi << 8) | reg_val_lo;
61		/* Read twice to clear */
62		adp5520_read(dev->master, ADP5520_KR_INT_STAT_1, &reg_val_lo);
63		adp5520_read(dev->master, ADP5520_KR_INT_STAT_2, &reg_val_hi);
64		keymask |= (reg_val_hi << 8) | reg_val_lo;
65		adp5520_keys_report_event(dev, keymask, 0);
66	}
67
68	return 0;
69}
70
71static int adp5520_keys_probe(struct platform_device *pdev)
72{
73	struct adp5520_keys_platform_data *pdata = dev_get_platdata(&pdev->dev);
74	struct input_dev *input;
75	struct adp5520_keys *dev;
76	int ret, i;
77	unsigned char en_mask, ctl_mask = 0;
78
79	if (pdev->id != ID_ADP5520) {
80		dev_err(&pdev->dev, "only ADP5520 supports Keypad\n");
81		return -EINVAL;
82	}
83
84	if (!pdata) {
85		dev_err(&pdev->dev, "missing platform data\n");
86		return -EINVAL;
87	}
88
89	if (!(pdata->rows_en_mask && pdata->cols_en_mask))
90		return -EINVAL;
91
92	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
93	if (!dev) {
94		dev_err(&pdev->dev, "failed to alloc memory\n");
95		return -ENOMEM;
96	}
97
98	input = devm_input_allocate_device(&pdev->dev);
99	if (!input)
100		return -ENOMEM;
101
102	dev->master = pdev->dev.parent;
103	dev->input = input;
104
105	input->name = pdev->name;
106	input->phys = "adp5520-keys/input0";
107	input->dev.parent = &pdev->dev;
108
109	input->id.bustype = BUS_I2C;
110	input->id.vendor = 0x0001;
111	input->id.product = 0x5520;
112	input->id.version = 0x0001;
113
114	input->keycodesize = sizeof(dev->keycode[0]);
115	input->keycodemax = pdata->keymapsize;
116	input->keycode = dev->keycode;
117
118	memcpy(dev->keycode, pdata->keymap,
119		pdata->keymapsize * input->keycodesize);
120
121	/* setup input device */
122	__set_bit(EV_KEY, input->evbit);
123
124	if (pdata->repeat)
125		__set_bit(EV_REP, input->evbit);
126
127	for (i = 0; i < input->keycodemax; i++)
128		__set_bit(dev->keycode[i], input->keybit);
129	__clear_bit(KEY_RESERVED, input->keybit);
130
131	ret = input_register_device(input);
132	if (ret) {
133		dev_err(&pdev->dev, "unable to register input device\n");
134		return ret;
135	}
136
137	en_mask = pdata->rows_en_mask | pdata->cols_en_mask;
138
139	ret = adp5520_set_bits(dev->master, ADP5520_GPIO_CFG_1, en_mask);
140
141	if (en_mask & ADP5520_COL_C3)
142		ctl_mask |= ADP5520_C3_MODE;
143
144	if (en_mask & ADP5520_ROW_R3)
145		ctl_mask |= ADP5520_R3_MODE;
146
147	if (ctl_mask)
148		ret |= adp5520_set_bits(dev->master, ADP5520_LED_CONTROL,
149			ctl_mask);
150
151	ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_PULLUP,
152		pdata->rows_en_mask);
153
154	if (ret) {
155		dev_err(&pdev->dev, "failed to write\n");
156		return -EIO;
157	}
158
159	dev->notifier.notifier_call = adp5520_keys_notifier;
160	ret = adp5520_register_notifier(dev->master, &dev->notifier,
161			ADP5520_KP_IEN | ADP5520_KR_IEN);
162	if (ret) {
163		dev_err(&pdev->dev, "failed to register notifier\n");
164		return ret;
165	}
166
167	platform_set_drvdata(pdev, dev);
168	return 0;
169}
170
171static void adp5520_keys_remove(struct platform_device *pdev)
172{
173	struct adp5520_keys *dev = platform_get_drvdata(pdev);
174
175	adp5520_unregister_notifier(dev->master, &dev->notifier,
176				ADP5520_KP_IEN | ADP5520_KR_IEN);
177}
178
179static struct platform_driver adp5520_keys_driver = {
180	.driver	= {
181		.name	= "adp5520-keys",
182	},
183	.probe		= adp5520_keys_probe,
184	.remove_new	= adp5520_keys_remove,
185};
186module_platform_driver(adp5520_keys_driver);
187
188MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
189MODULE_DESCRIPTION("Keys ADP5520 Driver");
190MODULE_LICENSE("GPL");
191MODULE_ALIAS("platform:adp5520-keys");
192