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/platform_device.h>
12 #include <linux/input.h>
13 #include <linux/mfd/adp5520.h>
14 #include <linux/slab.h>
15 #include <linux/device.h>
16 
17 struct adp5520_keys {
18 	struct input_dev *input;
19 	struct notifier_block notifier;
20 	struct device *master;
21 	unsigned short keycode[ADP5520_KEYMAPSIZE];
22 };
23 
adp5520_keys_report_event(struct adp5520_keys * dev,unsigned short keymask,int value)24 static 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 
adp5520_keys_notifier(struct notifier_block * nb,unsigned long event,void * data)36 static 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 
adp5520_keys_probe(struct platform_device * pdev)72 static 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) {
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 = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
94 	if (!dev) {
95 		dev_err(&pdev->dev, "failed to alloc memory\n");
96 		return -ENOMEM;
97 	}
98 
99 	input = devm_input_allocate_device(&pdev->dev);
100 	if (!input)
101 		return -ENOMEM;
102 
103 	dev->master = pdev->dev.parent;
104 	dev->input = input;
105 
106 	input->name = pdev->name;
107 	input->phys = "adp5520-keys/input0";
108 	input->dev.parent = &pdev->dev;
109 
110 	input->id.bustype = BUS_I2C;
111 	input->id.vendor = 0x0001;
112 	input->id.product = 0x5520;
113 	input->id.version = 0x0001;
114 
115 	input->keycodesize = sizeof(dev->keycode[0]);
116 	input->keycodemax = pdata->keymapsize;
117 	input->keycode = dev->keycode;
118 
119 	memcpy(dev->keycode, pdata->keymap,
120 		pdata->keymapsize * input->keycodesize);
121 
122 	/* setup input device */
123 	__set_bit(EV_KEY, input->evbit);
124 
125 	if (pdata->repeat)
126 		__set_bit(EV_REP, input->evbit);
127 
128 	for (i = 0; i < input->keycodemax; i++)
129 		__set_bit(dev->keycode[i], input->keybit);
130 	__clear_bit(KEY_RESERVED, input->keybit);
131 
132 	ret = input_register_device(input);
133 	if (ret) {
134 		dev_err(&pdev->dev, "unable to register input device\n");
135 		return ret;
136 	}
137 
138 	en_mask = pdata->rows_en_mask | pdata->cols_en_mask;
139 
140 	ret = adp5520_set_bits(dev->master, ADP5520_GPIO_CFG_1, en_mask);
141 
142 	if (en_mask & ADP5520_COL_C3)
143 		ctl_mask |= ADP5520_C3_MODE;
144 
145 	if (en_mask & ADP5520_ROW_R3)
146 		ctl_mask |= ADP5520_R3_MODE;
147 
148 	if (ctl_mask)
149 		ret |= adp5520_set_bits(dev->master, ADP5520_LED_CONTROL,
150 			ctl_mask);
151 
152 	ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_PULLUP,
153 		pdata->rows_en_mask);
154 
155 	if (ret) {
156 		dev_err(&pdev->dev, "failed to write\n");
157 		return -EIO;
158 	}
159 
160 	dev->notifier.notifier_call = adp5520_keys_notifier;
161 	ret = adp5520_register_notifier(dev->master, &dev->notifier,
162 			ADP5520_KP_IEN | ADP5520_KR_IEN);
163 	if (ret) {
164 		dev_err(&pdev->dev, "failed to register notifier\n");
165 		return ret;
166 	}
167 
168 	platform_set_drvdata(pdev, dev);
169 	return 0;
170 }
171 
adp5520_keys_remove(struct platform_device * pdev)172 static int adp5520_keys_remove(struct platform_device *pdev)
173 {
174 	struct adp5520_keys *dev = platform_get_drvdata(pdev);
175 
176 	adp5520_unregister_notifier(dev->master, &dev->notifier,
177 				ADP5520_KP_IEN | ADP5520_KR_IEN);
178 
179 	return 0;
180 }
181 
182 static struct platform_driver adp5520_keys_driver = {
183 	.driver	= {
184 		.name	= "adp5520-keys",
185 	},
186 	.probe		= adp5520_keys_probe,
187 	.remove		= adp5520_keys_remove,
188 };
189 module_platform_driver(adp5520_keys_driver);
190 
191 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
192 MODULE_DESCRIPTION("Keys ADP5520 Driver");
193 MODULE_LICENSE("GPL");
194 MODULE_ALIAS("platform:adp5520-keys");
195