drivers/input/keyboard/mcs_touchkey.c

   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 = "MELPAS 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                 .owner  = THIS_MODULE,
 269                 .pm     = &mcs_touchkey_pm_ops,
 270         },
 271         .probe          = mcs_touchkey_probe,
 272         .remove         = mcs_touchkey_remove,
 273         .shutdown       = mcs_touchkey_shutdown,
 274         .id_table       = mcs_touchkey_id,
 275 };
 276
 277 module_i2c_driver(mcs_touchkey_driver);
 278
 279 /* Module information */
 280 MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
 281 MODULE_AUTHOR("HeungJun Kim <riverful.kim@samsung.com>");
 282 MODULE_DESCRIPTION("Touchkey driver for MELFAS MCS5000/5080 controller");
 283 MODULE_LICENSE("GPL");