release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/input/keyboard/mcs_touchkey.c

   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");