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
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, ®_val_lo);
47 adp5520_read(dev->master, ADP5520_KP_INT_STAT_2, ®_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, ®_val_lo);
52 adp5520_read(dev->master, ADP5520_KP_INT_STAT_2, ®_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, ®_val_lo);
59 adp5520_read(dev->master, ADP5520_KR_INT_STAT_2, ®_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, ®_val_lo);
64 adp5520_read(dev->master, ADP5520_KR_INT_STAT_2, ®_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 __devinit adp5520_keys_probe(struct platform_device *pdev)
73 {
74 struct adp5520_keys_platform_data *pdata = pdev->dev.platform_data;
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
176 err1:
177 input_unregister_device(input);
178 input = NULL;
179 err:
180 input_free_device(input);
181 kfree(dev);
182 return ret;
183 }
184
adp5520_keys_remove(struct platform_device * pdev)185 static int __devexit 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
197 static struct platform_driver adp5520_keys_driver = {
198 .driver = {
199 .name = "adp5520-keys",
200 .owner = THIS_MODULE,
201 },
202 .probe = adp5520_keys_probe,
203 .remove = __devexit_p(adp5520_keys_remove),
204 };
205 module_platform_driver(adp5520_keys_driver);
206
207 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
208 MODULE_DESCRIPTION("Keys ADP5520 Driver");
209 MODULE_LICENSE("GPL");
210 MODULE_ALIAS("platform:adp5520-keys");
211