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 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, ®_val_lo); 46 adp5520_read(dev->master, ADP5520_KP_INT_STAT_2, ®_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, ®_val_lo); 51 adp5520_read(dev->master, ADP5520_KP_INT_STAT_2, ®_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, ®_val_lo); 58 adp5520_read(dev->master, ADP5520_KR_INT_STAT_2, ®_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, ®_val_lo); 63 adp5520_read(dev->master, ADP5520_KR_INT_STAT_2, ®_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 __devinit adp5520_keys_probe(struct platform_device *pdev) 72 { 73 struct adp5520_keys_platform_data *pdata = pdev->dev.platform_data; 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 __devexit 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 = __devexit_p(adp5520_keys_remove), 203 }; 204 205 static int __init adp5520_keys_init(void) 206 { 207 return platform_driver_register(&adp5520_keys_driver); 208 } 209 module_init(adp5520_keys_init); 210 211 static void __exit adp5520_keys_exit(void) 212 { 213 platform_driver_unregister(&adp5520_keys_driver); 214 } 215 module_exit(adp5520_keys_exit); 216 217 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); 218 MODULE_DESCRIPTION("Keys ADP5520 Driver"); 219 MODULE_LICENSE("GPL"); 220 MODULE_ALIAS("platform:adp5520-keys"); 221