1 /* 2 * 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/i2c.h> 16 #include <linux/i2c/mcs.h> 17 #include <linux/interrupt.h> 18 #include <linux/input.h> 19 #include <linux/irq.h> 20 #include <linux/slab.h> 21 #include <linux/pm.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 void (*poweron)(bool); 49 50 struct i2c_client *client; 51 struct input_dev *input_dev; 52 struct mcs_touchkey_chip chip; 53 unsigned int key_code; 54 unsigned int key_val; 55 unsigned short keycodes[]; 56 }; 57 58 static irqreturn_t mcs_touchkey_interrupt(int irq, void *dev_id) 59 { 60 struct mcs_touchkey_data *data = dev_id; 61 struct mcs_touchkey_chip *chip = &data->chip; 62 struct i2c_client *client = data->client; 63 struct input_dev *input = data->input_dev; 64 unsigned int key_val; 65 unsigned int pressed; 66 int val; 67 68 val = i2c_smbus_read_byte_data(client, chip->status_reg); 69 if (val < 0) { 70 dev_err(&client->dev, "i2c read error [%d]\n", val); 71 goto out; 72 } 73 74 pressed = (val & (1 << chip->pressbit)) >> chip->pressbit; 75 if (chip->press_invert) 76 pressed ^= chip->press_invert; 77 78 /* key_val is 0 when released, so we should use key_val of press. */ 79 if (pressed) { 80 key_val = val & (0xff >> (8 - chip->pressbit)); 81 if (!key_val) 82 goto out; 83 key_val -= chip->baseval; 84 data->key_code = data->keycodes[key_val]; 85 data->key_val = key_val; 86 } 87 88 input_event(input, EV_MSC, MSC_SCAN, data->key_val); 89 input_report_key(input, data->key_code, pressed); 90 input_sync(input); 91 92 dev_dbg(&client->dev, "key %d %d %s\n", data->key_val, data->key_code, 93 pressed ? "pressed" : "released"); 94 95 out: 96 return IRQ_HANDLED; 97 } 98 99 static int mcs_touchkey_probe(struct i2c_client *client, 100 const struct i2c_device_id *id) 101 { 102 const struct mcs_platform_data *pdata; 103 struct mcs_touchkey_data *data; 104 struct input_dev *input_dev; 105 unsigned int fw_reg; 106 int fw_ver; 107 int error; 108 int i; 109 110 pdata = dev_get_platdata(&client->dev); 111 if (!pdata) { 112 dev_err(&client->dev, "no platform data defined\n"); 113 return -EINVAL; 114 } 115 116 data = kzalloc(sizeof(struct mcs_touchkey_data) + 117 sizeof(data->keycodes[0]) * (pdata->key_maxval + 1), 118 GFP_KERNEL); 119 input_dev = input_allocate_device(); 120 if (!data || !input_dev) { 121 dev_err(&client->dev, "Failed to allocate memory\n"); 122 error = -ENOMEM; 123 goto err_free_mem; 124 } 125 126 data->client = client; 127 data->input_dev = input_dev; 128 129 if (id->driver_data == MCS5000_TOUCHKEY) { 130 data->chip.status_reg = MCS5000_TOUCHKEY_STATUS; 131 data->chip.pressbit = MCS5000_TOUCHKEY_STATUS_PRESS; 132 data->chip.baseval = MCS5000_TOUCHKEY_BASE_VAL; 133 fw_reg = MCS5000_TOUCHKEY_FW; 134 } else { 135 data->chip.status_reg = MCS5080_TOUCHKEY_STATUS; 136 data->chip.pressbit = MCS5080_TOUCHKEY_STATUS_PRESS; 137 data->chip.press_invert = 1; 138 data->chip.baseval = MCS5080_TOUCHKEY_BASE_VAL; 139 fw_reg = MCS5080_TOUCHKEY_FW; 140 } 141 142 fw_ver = i2c_smbus_read_byte_data(client, fw_reg); 143 if (fw_ver < 0) { 144 error = fw_ver; 145 dev_err(&client->dev, "i2c read error[%d]\n", error); 146 goto err_free_mem; 147 } 148 dev_info(&client->dev, "Firmware version: %d\n", fw_ver); 149 150 input_dev->name = "MELFAS MCS Touchkey"; 151 input_dev->id.bustype = BUS_I2C; 152 input_dev->dev.parent = &client->dev; 153 input_dev->evbit[0] = BIT_MASK(EV_KEY); 154 if (!pdata->no_autorepeat) 155 input_dev->evbit[0] |= BIT_MASK(EV_REP); 156 input_dev->keycode = data->keycodes; 157 input_dev->keycodesize = sizeof(data->keycodes[0]); 158 input_dev->keycodemax = pdata->key_maxval + 1; 159 160 for (i = 0; i < pdata->keymap_size; i++) { 161 unsigned int val = MCS_KEY_VAL(pdata->keymap[i]); 162 unsigned int code = MCS_KEY_CODE(pdata->keymap[i]); 163 164 data->keycodes[val] = code; 165 __set_bit(code, input_dev->keybit); 166 } 167 168 input_set_capability(input_dev, EV_MSC, MSC_SCAN); 169 input_set_drvdata(input_dev, data); 170 171 if (pdata->cfg_pin) 172 pdata->cfg_pin(); 173 174 if (pdata->poweron) { 175 data->poweron = pdata->poweron; 176 data->poweron(true); 177 } 178 179 error = request_threaded_irq(client->irq, NULL, mcs_touchkey_interrupt, 180 IRQF_TRIGGER_FALLING | IRQF_ONESHOT, 181 client->dev.driver->name, data); 182 if (error) { 183 dev_err(&client->dev, "Failed to register interrupt\n"); 184 goto err_free_mem; 185 } 186 187 error = input_register_device(input_dev); 188 if (error) 189 goto err_free_irq; 190 191 i2c_set_clientdata(client, data); 192 return 0; 193 194 err_free_irq: 195 free_irq(client->irq, data); 196 err_free_mem: 197 input_free_device(input_dev); 198 kfree(data); 199 return error; 200 } 201 202 static int mcs_touchkey_remove(struct i2c_client *client) 203 { 204 struct mcs_touchkey_data *data = i2c_get_clientdata(client); 205 206 free_irq(client->irq, data); 207 if (data->poweron) 208 data->poweron(false); 209 input_unregister_device(data->input_dev); 210 kfree(data); 211 212 return 0; 213 } 214 215 static void mcs_touchkey_shutdown(struct i2c_client *client) 216 { 217 struct mcs_touchkey_data *data = i2c_get_clientdata(client); 218 219 if (data->poweron) 220 data->poweron(false); 221 } 222 223 #ifdef CONFIG_PM_SLEEP 224 static int mcs_touchkey_suspend(struct device *dev) 225 { 226 struct mcs_touchkey_data *data = dev_get_drvdata(dev); 227 struct i2c_client *client = data->client; 228 229 /* Disable the work */ 230 disable_irq(client->irq); 231 232 /* Finally turn off the power */ 233 if (data->poweron) 234 data->poweron(false); 235 236 return 0; 237 } 238 239 static int mcs_touchkey_resume(struct device *dev) 240 { 241 struct mcs_touchkey_data *data = dev_get_drvdata(dev); 242 struct i2c_client *client = data->client; 243 244 /* Enable the device first */ 245 if (data->poweron) 246 data->poweron(true); 247 248 /* Enable irq again */ 249 enable_irq(client->irq); 250 251 return 0; 252 } 253 #endif 254 255 static SIMPLE_DEV_PM_OPS(mcs_touchkey_pm_ops, 256 mcs_touchkey_suspend, mcs_touchkey_resume); 257 258 static const struct i2c_device_id mcs_touchkey_id[] = { 259 { "mcs5000_touchkey", MCS5000_TOUCHKEY }, 260 { "mcs5080_touchkey", MCS5080_TOUCHKEY }, 261 { } 262 }; 263 MODULE_DEVICE_TABLE(i2c, mcs_touchkey_id); 264 265 static struct i2c_driver mcs_touchkey_driver = { 266 .driver = { 267 .name = "mcs_touchkey", 268 .pm = &mcs_touchkey_pm_ops, 269 }, 270 .probe = mcs_touchkey_probe, 271 .remove = mcs_touchkey_remove, 272 .shutdown = mcs_touchkey_shutdown, 273 .id_table = mcs_touchkey_id, 274 }; 275 276 module_i2c_driver(mcs_touchkey_driver); 277 278 /* Module information */ 279 MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>"); 280 MODULE_AUTHOR("HeungJun Kim <riverful.kim@samsung.com>"); 281 MODULE_DESCRIPTION("Touchkey driver for MELFAS MCS5000/5080 controller"); 282 MODULE_LICENSE("GPL"); 283