1 /* 2 * mcs_touchkey.c - Touchkey driver for MELFAS MCS5000/5080 controller 3 * 4 * Copyright (C) 2010 Samsung Electronics Co.Ltd 5 * Author: HeungJun Kim <riverful.kim@samsung.com> 6 * Author: Joonyoung Shim <jy0922.shim@samsung.com> 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License as published by the 10 * Free Software Foundation; either version 2 of the License, or (at your 11 * option) any later version. 12 */ 13 14 #include <linux/module.h> 15 #include <linux/init.h> 16 #include <linux/i2c.h> 17 #include <linux/i2c/mcs.h> 18 #include <linux/interrupt.h> 19 #include <linux/input.h> 20 #include <linux/irq.h> 21 #include <linux/slab.h> 22 23 /* MCS5000 Touchkey */ 24 #define MCS5000_TOUCHKEY_STATUS 0x04 25 #define MCS5000_TOUCHKEY_STATUS_PRESS 7 26 #define MCS5000_TOUCHKEY_FW 0x0a 27 #define MCS5000_TOUCHKEY_BASE_VAL 0x61 28 29 /* MCS5080 Touchkey */ 30 #define MCS5080_TOUCHKEY_STATUS 0x00 31 #define MCS5080_TOUCHKEY_STATUS_PRESS 3 32 #define MCS5080_TOUCHKEY_FW 0x01 33 #define MCS5080_TOUCHKEY_BASE_VAL 0x1 34 35 enum mcs_touchkey_type { 36 MCS5000_TOUCHKEY, 37 MCS5080_TOUCHKEY, 38 }; 39 40 struct mcs_touchkey_chip { 41 unsigned int status_reg; 42 unsigned int pressbit; 43 unsigned int press_invert; 44 unsigned int baseval; 45 }; 46 47 struct mcs_touchkey_data { 48 struct i2c_client *client; 49 struct input_dev *input_dev; 50 struct mcs_touchkey_chip chip; 51 unsigned int key_code; 52 unsigned int key_val; 53 unsigned short keycodes[]; 54 }; 55 56 static irqreturn_t mcs_touchkey_interrupt(int irq, void *dev_id) 57 { 58 struct mcs_touchkey_data *data = dev_id; 59 struct mcs_touchkey_chip *chip = &data->chip; 60 struct i2c_client *client = data->client; 61 struct input_dev *input = data->input_dev; 62 unsigned int key_val; 63 unsigned int pressed; 64 int val; 65 66 val = i2c_smbus_read_byte_data(client, chip->status_reg); 67 if (val < 0) { 68 dev_err(&client->dev, "i2c read error [%d]\n", val); 69 goto out; 70 } 71 72 pressed = (val & (1 << chip->pressbit)) >> chip->pressbit; 73 if (chip->press_invert) 74 pressed ^= chip->press_invert; 75 76 /* key_val is 0 when released, so we should use key_val of press. */ 77 if (pressed) { 78 key_val = val & (0xff >> (8 - chip->pressbit)); 79 if (!key_val) 80 goto out; 81 key_val -= chip->baseval; 82 data->key_code = data->keycodes[key_val]; 83 data->key_val = key_val; 84 } 85 86 input_event(input, EV_MSC, MSC_SCAN, data->key_val); 87 input_report_key(input, data->key_code, pressed); 88 input_sync(input); 89 90 dev_dbg(&client->dev, "key %d %d %s\n", data->key_val, data->key_code, 91 pressed ? "pressed" : "released"); 92 93 out: 94 return IRQ_HANDLED; 95 } 96 97 static int __devinit mcs_touchkey_probe(struct i2c_client *client, 98 const struct i2c_device_id *id) 99 { 100 const struct mcs_platform_data *pdata; 101 struct mcs_touchkey_data *data; 102 struct input_dev *input_dev; 103 unsigned int fw_reg; 104 int fw_ver; 105 int error; 106 int i; 107 108 pdata = client->dev.platform_data; 109 if (!pdata) { 110 dev_err(&client->dev, "no platform data defined\n"); 111 return -EINVAL; 112 } 113 114 data = kzalloc(sizeof(struct mcs_touchkey_data) + 115 sizeof(data->keycodes[0]) * (pdata->key_maxval + 1), 116 GFP_KERNEL); 117 input_dev = input_allocate_device(); 118 if (!data || !input_dev) { 119 dev_err(&client->dev, "Failed to allocate memory\n"); 120 error = -ENOMEM; 121 goto err_free_mem; 122 } 123 124 data->client = client; 125 data->input_dev = input_dev; 126 127 if (id->driver_data == MCS5000_TOUCHKEY) { 128 data->chip.status_reg = MCS5000_TOUCHKEY_STATUS; 129 data->chip.pressbit = MCS5000_TOUCHKEY_STATUS_PRESS; 130 data->chip.baseval = MCS5000_TOUCHKEY_BASE_VAL; 131 fw_reg = MCS5000_TOUCHKEY_FW; 132 } else { 133 data->chip.status_reg = MCS5080_TOUCHKEY_STATUS; 134 data->chip.pressbit = MCS5080_TOUCHKEY_STATUS_PRESS; 135 data->chip.press_invert = 1; 136 data->chip.baseval = MCS5080_TOUCHKEY_BASE_VAL; 137 fw_reg = MCS5080_TOUCHKEY_FW; 138 } 139 140 fw_ver = i2c_smbus_read_byte_data(client, fw_reg); 141 if (fw_ver < 0) { 142 error = fw_ver; 143 dev_err(&client->dev, "i2c read error[%d]\n", error); 144 goto err_free_mem; 145 } 146 dev_info(&client->dev, "Firmware version: %d\n", fw_ver); 147 148 input_dev->name = "MELPAS MCS Touchkey"; 149 input_dev->id.bustype = BUS_I2C; 150 input_dev->dev.parent = &client->dev; 151 input_dev->evbit[0] = BIT_MASK(EV_KEY); 152 if (!pdata->no_autorepeat) 153 input_dev->evbit[0] |= BIT_MASK(EV_REP); 154 input_dev->keycode = data->keycodes; 155 input_dev->keycodesize = sizeof(data->keycodes[0]); 156 input_dev->keycodemax = pdata->key_maxval + 1; 157 158 for (i = 0; i < pdata->keymap_size; i++) { 159 unsigned int val = MCS_KEY_VAL(pdata->keymap[i]); 160 unsigned int code = MCS_KEY_CODE(pdata->keymap[i]); 161 162 data->keycodes[val] = code; 163 __set_bit(code, input_dev->keybit); 164 } 165 166 input_set_capability(input_dev, EV_MSC, MSC_SCAN); 167 input_set_drvdata(input_dev, data); 168 169 if (pdata->cfg_pin) 170 pdata->cfg_pin(); 171 172 error = request_threaded_irq(client->irq, NULL, mcs_touchkey_interrupt, 173 IRQF_TRIGGER_FALLING, client->dev.driver->name, data); 174 if (error) { 175 dev_err(&client->dev, "Failed to register interrupt\n"); 176 goto err_free_mem; 177 } 178 179 error = input_register_device(input_dev); 180 if (error) 181 goto err_free_irq; 182 183 i2c_set_clientdata(client, data); 184 return 0; 185 186 err_free_irq: 187 free_irq(client->irq, data); 188 err_free_mem: 189 input_free_device(input_dev); 190 kfree(data); 191 return error; 192 } 193 194 static int __devexit mcs_touchkey_remove(struct i2c_client *client) 195 { 196 struct mcs_touchkey_data *data = i2c_get_clientdata(client); 197 198 free_irq(client->irq, data); 199 input_unregister_device(data->input_dev); 200 kfree(data); 201 202 return 0; 203 } 204 205 static const struct i2c_device_id mcs_touchkey_id[] = { 206 { "mcs5000_touchkey", MCS5000_TOUCHKEY }, 207 { "mcs5080_touchkey", MCS5080_TOUCHKEY }, 208 { } 209 }; 210 MODULE_DEVICE_TABLE(i2c, mcs_touchkey_id); 211 212 static struct i2c_driver mcs_touchkey_driver = { 213 .driver = { 214 .name = "mcs_touchkey", 215 .owner = THIS_MODULE, 216 }, 217 .probe = mcs_touchkey_probe, 218 .remove = __devexit_p(mcs_touchkey_remove), 219 .id_table = mcs_touchkey_id, 220 }; 221 222 static int __init mcs_touchkey_init(void) 223 { 224 return i2c_add_driver(&mcs_touchkey_driver); 225 } 226 227 static void __exit mcs_touchkey_exit(void) 228 { 229 i2c_del_driver(&mcs_touchkey_driver); 230 } 231 232 module_init(mcs_touchkey_init); 233 module_exit(mcs_touchkey_exit); 234 235 /* Module information */ 236 MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>"); 237 MODULE_AUTHOR("HeungJun Kim <riverful.kim@samsung.com>"); 238 MODULE_DESCRIPTION("Touchkey driver for MELFAS MCS5000/5080 controller"); 239 MODULE_LICENSE("GPL"); 240