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 
16 struct adp5520_keys {
17 	struct input_dev *input;
18 	struct notifier_block notifier;
19 	struct device *master;
20 	unsigned short keycode[ADP5520_KEYMAPSIZE];
21 };
22 
adp5520_keys_report_event(struct adp5520_keys * dev,unsigned short keymask,int value)23 static 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 
adp5520_keys_notifier(struct notifier_block * nb,unsigned long event,void * data)35 static 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 
adp5520_keys_probe(struct platform_device * pdev)71 static 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 
adp5520_keys_remove(struct platform_device * pdev)171 static 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 
179 static 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 };
186 module_platform_driver(adp5520_keys_driver);
187 
188 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
189 MODULE_DESCRIPTION("Keys ADP5520 Driver");
190 MODULE_LICENSE("GPL");
191 MODULE_ALIAS("platform:adp5520-keys");
192