adp5520-keys.c revision c838cb3d477f79738ee03ede53a3f724021f3ae0 
1/*
2 * Keypad driver for Analog Devices ADP5520 MFD PMICs
3 *
4 * Copyright 2009 Analog Devices Inc.
5 *
6 * Licensed under the GPL-2 or later.
7 */
8
9#include <linux/module.h>
10#include <linux/kernel.h>
11#include <linux/init.h>
12#include <linux/platform_device.h>
13#include <linux/input.h>
14#include <linux/mfd/adp5520.h>
15#include <linux/slab.h>
16
17struct adp5520_keys {
18	struct input_dev *input;
19	struct notifier_block notifier;
20	struct device *master;
21	unsigned short keycode[ADP5520_KEYMAPSIZE];
22};
23
24static void adp5520_keys_report_event(struct adp5520_keys *dev,
25					unsigned short keymask, int value)
26{
27	int i;
28
29	for (i = 0; i < ADP5520_MAXKEYS; i++)
30		if (keymask & (1 << i))
31			input_report_key(dev->input, dev->keycode[i], value);
32
33	input_sync(dev->input);
34}
35
36static int adp5520_keys_notifier(struct notifier_block *nb,
37				 unsigned long event, void *data)
38{
39	struct adp5520_keys *dev;
40	uint8_t reg_val_lo, reg_val_hi;
41	unsigned short keymask;
42
43	dev = container_of(nb, struct adp5520_keys, notifier);
44
45	if (event & ADP5520_KP_INT) {
46		adp5520_read(dev->master, ADP5520_KP_INT_STAT_1, &reg_val_lo);
47		adp5520_read(dev->master, ADP5520_KP_INT_STAT_2, &reg_val_hi);
48
49		keymask = (reg_val_hi << 8) | reg_val_lo;
50		/* Read twice to clear */
51		adp5520_read(dev->master, ADP5520_KP_INT_STAT_1, &reg_val_lo);
52		adp5520_read(dev->master, ADP5520_KP_INT_STAT_2, &reg_val_hi);
53		keymask |= (reg_val_hi << 8) | reg_val_lo;
54		adp5520_keys_report_event(dev, keymask, 1);
55	}
56
57	if (event & ADP5520_KR_INT) {
58		adp5520_read(dev->master, ADP5520_KR_INT_STAT_1, &reg_val_lo);
59		adp5520_read(dev->master, ADP5520_KR_INT_STAT_2, &reg_val_hi);
60
61		keymask = (reg_val_hi << 8) | reg_val_lo;
62		/* Read twice to clear */
63		adp5520_read(dev->master, ADP5520_KR_INT_STAT_1, &reg_val_lo);
64		adp5520_read(dev->master, ADP5520_KR_INT_STAT_2, &reg_val_hi);
65		keymask |= (reg_val_hi << 8) | reg_val_lo;
66		adp5520_keys_report_event(dev, keymask, 0);
67	}
68
69	return 0;
70}
71
72static int adp5520_keys_probe(struct platform_device *pdev)
73{
74	struct adp5520_keys_platform_data *pdata = dev_get_platdata(&pdev->dev);
75	struct input_dev *input;
76	struct adp5520_keys *dev;
77	int ret, i;
78	unsigned char en_mask, ctl_mask = 0;
79
80	if (pdev->id != ID_ADP5520) {
81		dev_err(&pdev->dev, "only ADP5520 supports Keypad\n");
82		return -EINVAL;
83	}
84
85	if (pdata == NULL) {
86		dev_err(&pdev->dev, "missing platform data\n");
87		return -EINVAL;
88	}
89
90	if (!(pdata->rows_en_mask && pdata->cols_en_mask))
91		return -EINVAL;
92
93	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
94	if (dev == NULL) {
95		dev_err(&pdev->dev, "failed to alloc memory\n");
96		return -ENOMEM;
97	}
98
99	input = input_allocate_device();
100	if (!input) {
101		ret = -ENOMEM;
102		goto err;
103	}
104
105	dev->master = pdev->dev.parent;
106	dev->input = input;
107
108	input->name = pdev->name;
109	input->phys = "adp5520-keys/input0";
110	input->dev.parent = &pdev->dev;
111
112	input_set_drvdata(input, dev);
113
114	input->id.bustype = BUS_I2C;
115	input->id.vendor = 0x0001;
116	input->id.product = 0x5520;
117	input->id.version = 0x0001;
118
119	input->keycodesize = sizeof(dev->keycode[0]);
120	input->keycodemax = pdata->keymapsize;
121	input->keycode = dev->keycode;
122
123	memcpy(dev->keycode, pdata->keymap,
124		pdata->keymapsize * input->keycodesize);
125
126	/* setup input device */
127	__set_bit(EV_KEY, input->evbit);
128
129	if (pdata->repeat)
130		__set_bit(EV_REP, input->evbit);
131
132	for (i = 0; i < input->keycodemax; i++)
133		__set_bit(dev->keycode[i], input->keybit);
134	__clear_bit(KEY_RESERVED, input->keybit);
135
136	ret = input_register_device(input);
137	if (ret) {
138		dev_err(&pdev->dev, "unable to register input device\n");
139		goto err;
140	}
141
142	en_mask = pdata->rows_en_mask | pdata->cols_en_mask;
143
144	ret = adp5520_set_bits(dev->master, ADP5520_GPIO_CFG_1, en_mask);
145
146	if (en_mask & ADP5520_COL_C3)
147		ctl_mask |= ADP5520_C3_MODE;
148
149	if (en_mask & ADP5520_ROW_R3)
150		ctl_mask |= ADP5520_R3_MODE;
151
152	if (ctl_mask)
153		ret |= adp5520_set_bits(dev->master, ADP5520_LED_CONTROL,
154			ctl_mask);
155
156	ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_PULLUP,
157		pdata->rows_en_mask);
158
159	if (ret) {
160		dev_err(&pdev->dev, "failed to write\n");
161		ret = -EIO;
162		goto err1;
163	}
164
165	dev->notifier.notifier_call = adp5520_keys_notifier;
166	ret = adp5520_register_notifier(dev->master, &dev->notifier,
167			ADP5520_KP_IEN | ADP5520_KR_IEN);
168	if (ret) {
169		dev_err(&pdev->dev, "failed to register notifier\n");
170		goto err1;
171	}
172
173	platform_set_drvdata(pdev, dev);
174	return 0;
175
176err1:
177	input_unregister_device(input);
178	input = NULL;
179err:
180	input_free_device(input);
181	kfree(dev);
182	return ret;
183}
184
185static int adp5520_keys_remove(struct platform_device *pdev)
186{
187	struct adp5520_keys *dev = platform_get_drvdata(pdev);
188
189	adp5520_unregister_notifier(dev->master, &dev->notifier,
190				ADP5520_KP_IEN | ADP5520_KR_IEN);
191
192	input_unregister_device(dev->input);
193	kfree(dev);
194	return 0;
195}
196
197static struct platform_driver adp5520_keys_driver = {
198	.driver	= {
199		.name	= "adp5520-keys",
200		.owner	= THIS_MODULE,
201	},
202	.probe		= adp5520_keys_probe,
203	.remove		= adp5520_keys_remove,
204};
205module_platform_driver(adp5520_keys_driver);
206
207MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
208MODULE_DESCRIPTION("Keys ADP5520 Driver");
209MODULE_LICENSE("GPL");
210MODULE_ALIAS("platform:adp5520-keys");
211