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Linux/drivers/input/keyboard/adp5520-keys.c

  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 
 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 
 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 
 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 
 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 == NULL) {
 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 = kzalloc(sizeof(*dev), GFP_KERNEL);
 93         if (dev == NULL) {
 94                 dev_err(&pdev->dev, "failed to alloc memory\n");
 95                 return -ENOMEM;
 96         }
 97 
 98         input = input_allocate_device();
 99         if (!input) {
100                 ret = -ENOMEM;
101                 goto err;
102         }
103 
104         dev->master = pdev->dev.parent;
105         dev->input = input;
106 
107         input->name = pdev->name;
108         input->phys = "adp5520-keys/input0";
109         input->dev.parent = &pdev->dev;
110 
111         input_set_drvdata(input, dev);
112 
113         input->id.bustype = BUS_I2C;
114         input->id.vendor = 0x0001;
115         input->id.product = 0x5520;
116         input->id.version = 0x0001;
117 
118         input->keycodesize = sizeof(dev->keycode[0]);
119         input->keycodemax = pdata->keymapsize;
120         input->keycode = dev->keycode;
121 
122         memcpy(dev->keycode, pdata->keymap,
123                 pdata->keymapsize * input->keycodesize);
124 
125         /* setup input device */
126         __set_bit(EV_KEY, input->evbit);
127 
128         if (pdata->repeat)
129                 __set_bit(EV_REP, input->evbit);
130 
131         for (i = 0; i < input->keycodemax; i++)
132                 __set_bit(dev->keycode[i], input->keybit);
133         __clear_bit(KEY_RESERVED, input->keybit);
134 
135         ret = input_register_device(input);
136         if (ret) {
137                 dev_err(&pdev->dev, "unable to register input device\n");
138                 goto err;
139         }
140 
141         en_mask = pdata->rows_en_mask | pdata->cols_en_mask;
142 
143         ret = adp5520_set_bits(dev->master, ADP5520_GPIO_CFG_1, en_mask);
144 
145         if (en_mask & ADP5520_COL_C3)
146                 ctl_mask |= ADP5520_C3_MODE;
147 
148         if (en_mask & ADP5520_ROW_R3)
149                 ctl_mask |= ADP5520_R3_MODE;
150 
151         if (ctl_mask)
152                 ret |= adp5520_set_bits(dev->master, ADP5520_LED_CONTROL,
153                         ctl_mask);
154 
155         ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_PULLUP,
156                 pdata->rows_en_mask);
157 
158         if (ret) {
159                 dev_err(&pdev->dev, "failed to write\n");
160                 ret = -EIO;
161                 goto err1;
162         }
163 
164         dev->notifier.notifier_call = adp5520_keys_notifier;
165         ret = adp5520_register_notifier(dev->master, &dev->notifier,
166                         ADP5520_KP_IEN | ADP5520_KR_IEN);
167         if (ret) {
168                 dev_err(&pdev->dev, "failed to register notifier\n");
169                 goto err1;
170         }
171 
172         platform_set_drvdata(pdev, dev);
173         return 0;
174 
175 err1:
176         input_unregister_device(input);
177         input = NULL;
178 err:
179         input_free_device(input);
180         kfree(dev);
181         return ret;
182 }
183 
184 static int adp5520_keys_remove(struct platform_device *pdev)
185 {
186         struct adp5520_keys *dev = platform_get_drvdata(pdev);
187 
188         adp5520_unregister_notifier(dev->master, &dev->notifier,
189                                 ADP5520_KP_IEN | ADP5520_KR_IEN);
190 
191         input_unregister_device(dev->input);
192         kfree(dev);
193         return 0;
194 }
195 
196 static struct platform_driver adp5520_keys_driver = {
197         .driver = {
198                 .name   = "adp5520-keys",
199                 .owner  = THIS_MODULE,
200         },
201         .probe          = adp5520_keys_probe,
202         .remove         = adp5520_keys_remove,
203 };
204 module_platform_driver(adp5520_keys_driver);
205 
206 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
207 MODULE_DESCRIPTION("Keys ADP5520 Driver");
208 MODULE_LICENSE("GPL");
209 MODULE_ALIAS("platform:adp5520-keys");
210 

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