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/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 #include <linux/pm.h> 23 24 /* MCS5000 Touchkey */ 25 #define MCS5000_TOUCHKEY_STATUS 0x04 26 #define MCS5000_TOUCHKEY_STATUS_PRESS 7 27 #define MCS5000_TOUCHKEY_FW 0x0a 28 #define MCS5000_TOUCHKEY_BASE_VAL 0x61 29 30 /* MCS5080 Touchkey */ 31 #define MCS5080_TOUCHKEY_STATUS 0x00 32 #define MCS5080_TOUCHKEY_STATUS_PRESS 3 33 #define MCS5080_TOUCHKEY_FW 0x01 34 #define MCS5080_TOUCHKEY_BASE_VAL 0x1 35 36 enum mcs_touchkey_type { 37 MCS5000_TOUCHKEY, 38 MCS5080_TOUCHKEY, 39 }; 40 41 struct mcs_touchkey_chip { 42 unsigned int status_reg; 43 unsigned int pressbit; 44 unsigned int press_invert; 45 unsigned int baseval; 46 }; 47 48 struct mcs_touchkey_data { 49 void (*poweron)(bool); 50 51 struct i2c_client *client; 52 struct input_dev *input_dev; 53 struct mcs_touchkey_chip chip; 54 unsigned int key_code; 55 unsigned int key_val; 56 unsigned short keycodes[]; 57 }; 58 59 static irqreturn_t mcs_touchkey_interrupt(int irq, void *dev_id) 60 { 61 struct mcs_touchkey_data *data = dev_id; 62 struct mcs_touchkey_chip *chip = &data->chip; 63 struct i2c_client *client = data->client; 64 struct input_dev *input = data->input_dev; 65 unsigned int key_val; 66 unsigned int pressed; 67 int val; 68 69 val = i2c_smbus_read_byte_data(client, chip->status_reg); 70 if (val < 0) { 71 dev_err(&client->dev, "i2c read error [%d]\n", val); 72 goto out; 73 } 74 75 pressed = (val & (1 << chip->pressbit)) >> chip->pressbit; 76 if (chip->press_invert) 77 pressed ^= chip->press_invert; 78 79 /* key_val is 0 when released, so we should use key_val of press. */ 80 if (pressed) { 81 key_val = val & (0xff >> (8 - chip->pressbit)); 82 if (!key_val) 83 goto out; 84 key_val -= chip->baseval; 85 data->key_code = data->keycodes[key_val]; 86 data->key_val = key_val; 87 } 88 89 input_event(input, EV_MSC, MSC_SCAN, data->key_val); 90 input_report_key(input, data->key_code, pressed); 91 input_sync(input); 92 93 dev_dbg(&client->dev, "key %d %d %s\n", data->key_val, data->key_code, 94 pressed ? "pressed" : "released"); 95 96 out: 97 return IRQ_HANDLED; 98 } 99 100 static int mcs_touchkey_probe(struct i2c_client *client, 101 const struct i2c_device_id *id) 102 { 103 const struct mcs_platform_data *pdata; 104 struct mcs_touchkey_data *data; 105 struct input_dev *input_dev; 106 unsigned int fw_reg; 107 int fw_ver; 108 int error; 109 int i; 110 111 pdata = client->dev.platform_data; 112 if (!pdata) { 113 dev_err(&client->dev, "no platform data defined\n"); 114 return -EINVAL; 115 } 116 117 data = kzalloc(sizeof(struct mcs_touchkey_data) + 118 sizeof(data->keycodes[0]) * (pdata->key_maxval + 1), 119 GFP_KERNEL); 120 input_dev = input_allocate_device(); 121 if (!data || !input_dev) { 122 dev_err(&client->dev, "Failed to allocate memory\n"); 123 error = -ENOMEM; 124 goto err_free_mem; 125 } 126 127 data->client = client; 128 data->input_dev = input_dev; 129 130 if (id->driver_data == MCS5000_TOUCHKEY) { 131 data->chip.status_reg = MCS5000_TOUCHKEY_STATUS; 132 data->chip.pressbit = MCS5000_TOUCHKEY_STATUS_PRESS; 133 data->chip.baseval = MCS5000_TOUCHKEY_BASE_VAL; 134 fw_reg = MCS5000_TOUCHKEY_FW; 135 } else { 136 data->chip.status_reg = MCS5080_TOUCHKEY_STATUS; 137 data->chip.pressbit = MCS5080_TOUCHKEY_STATUS_PRESS; 138 data->chip.press_invert = 1; 139 data->chip.baseval = MCS5080_TOUCHKEY_BASE_VAL; 140 fw_reg = MCS5080_TOUCHKEY_FW; 141 } 142 143 fw_ver = i2c_smbus_read_byte_data(client, fw_reg); 144 if (fw_ver < 0) { 145 error = fw_ver; 146 dev_err(&client->dev, "i2c read error[%d]\n", error); 147 goto err_free_mem; 148 } 149 dev_info(&client->dev, "Firmware version: %d\n", fw_ver); 150 151 input_dev->name = "MELPAS MCS Touchkey"; 152 input_dev->id.bustype = BUS_I2C; 153 input_dev->dev.parent = &client->dev; 154 input_dev->evbit[0] = BIT_MASK(EV_KEY); 155 if (!pdata->no_autorepeat) 156 input_dev->evbit[0] |= BIT_MASK(EV_REP); 157 input_dev->keycode = data->keycodes; 158 input_dev->keycodesize = sizeof(data->keycodes[0]); 159 input_dev->keycodemax = pdata->key_maxval + 1; 160 161 for (i = 0; i < pdata->keymap_size; i++) { 162 unsigned int val = MCS_KEY_VAL(pdata->keymap[i]); 163 unsigned int code = MCS_KEY_CODE(pdata->keymap[i]); 164 165 data->keycodes[val] = code; 166 __set_bit(code, input_dev->keybit); 167 } 168 169 input_set_capability(input_dev, EV_MSC, MSC_SCAN); 170 input_set_drvdata(input_dev, data); 171 172 if (pdata->cfg_pin) 173 pdata->cfg_pin(); 174 175 if (pdata->poweron) { 176 data->poweron = pdata->poweron; 177 data->poweron(true); 178 } 179 180 error = request_threaded_irq(client->irq, NULL, mcs_touchkey_interrupt, 181 IRQF_TRIGGER_FALLING | IRQF_ONESHOT, 182 client->dev.driver->name, data); 183 if (error) { 184 dev_err(&client->dev, "Failed to register interrupt\n"); 185 goto err_free_mem; 186 } 187 188 error = input_register_device(input_dev); 189 if (error) 190 goto err_free_irq; 191 192 i2c_set_clientdata(client, data); 193 return 0; 194 195 err_free_irq: 196 free_irq(client->irq, data); 197 err_free_mem: 198 input_free_device(input_dev); 199 kfree(data); 200 return error; 201 } 202 203 static int mcs_touchkey_remove(struct i2c_client *client) 204 { 205 struct mcs_touchkey_data *data = i2c_get_clientdata(client); 206 207 free_irq(client->irq, data); 208 if (data->poweron) 209 data->poweron(false); 210 input_unregister_device(data->input_dev); 211 kfree(data); 212 213 return 0; 214 } 215 216 static void mcs_touchkey_shutdown(struct i2c_client *client) 217 { 218 struct mcs_touchkey_data *data = i2c_get_clientdata(client); 219 220 if (data->poweron) 221 data->poweron(false); 222 } 223 224 #ifdef CONFIG_PM_SLEEP 225 static int mcs_touchkey_suspend(struct device *dev) 226 { 227 struct mcs_touchkey_data *data = dev_get_drvdata(dev); 228 struct i2c_client *client = data->client; 229 230 /* Disable the work */ 231 disable_irq(client->irq); 232 233 /* Finally turn off the power */ 234 if (data->poweron) 235 data->poweron(false); 236 237 return 0; 238 } 239 240 static int mcs_touchkey_resume(struct device *dev) 241 { 242 struct mcs_touchkey_data *data = dev_get_drvdata(dev); 243 struct i2c_client *client = data->client; 244 245 /* Enable the device first */ 246 if (data->poweron) 247 data->poweron(true); 248 249 /* Enable irq again */ 250 enable_irq(client->irq); 251 252 return 0; 253 } 254 #endif 255 256 static SIMPLE_DEV_PM_OPS(mcs_touchkey_pm_ops, 257 mcs_touchkey_suspend, mcs_touchkey_resume); 258 259 static const struct i2c_device_id mcs_touchkey_id[] = { 260 { "mcs5000_touchkey", MCS5000_TOUCHKEY }, 261 { "mcs5080_touchkey", MCS5080_TOUCHKEY }, 262 { } 263 }; 264 MODULE_DEVICE_TABLE(i2c, mcs_touchkey_id); 265 266 static struct i2c_driver mcs_touchkey_driver = { 267 .driver = { 268 .name = "mcs_touchkey", 269 .owner = THIS_MODULE, 270 .pm = &mcs_touchkey_pm_ops, 271 }, 272 .probe = mcs_touchkey_probe, 273 .remove = mcs_touchkey_remove, 274 .shutdown = mcs_touchkey_shutdown, 275 .id_table = mcs_touchkey_id, 276 }; 277 278 module_i2c_driver(mcs_touchkey_driver); 279 280 /* Module information */ 281 MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>"); 282 MODULE_AUTHOR("HeungJun Kim <riverful.kim@samsung.com>"); 283 MODULE_DESCRIPTION("Touchkey driver for MELFAS MCS5000/5080 controller"); 284 MODULE_LICENSE("GPL"); 285