drivers/input/misc/gp2ap002a00f.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2011 Sony Ericsson Mobile Communications Inc.
   4  *
   5  * Author: Courtney Cavin <courtney.cavin@sonyericsson.com>
   6  * Prepared for up-stream by: Oskar Andero <oskar.andero@sonyericsson.com>
   7  */
   8
   9 #include <linux/i2c.h>
  10 #include <linux/irq.h>
  11 #include <linux/slab.h>
  12 #include <linux/input.h>
  13 #include <linux/module.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/gpio.h>
  16 #include <linux/delay.h>
  17 #include <linux/input/gp2ap002a00f.h>
  18
  19 struct gp2a_data {
  20         struct input_dev *input;
  21         const struct gp2a_platform_data *pdata;
  22         struct i2c_client *i2c_client;
  23 };
  24
  25 enum gp2a_addr {
  26         GP2A_ADDR_PROX  = 0x0,
  27         GP2A_ADDR_GAIN  = 0x1,
  28         GP2A_ADDR_HYS   = 0x2,
  29         GP2A_ADDR_CYCLE = 0x3,
  30         GP2A_ADDR_OPMOD = 0x4,
  31         GP2A_ADDR_CON   = 0x6
  32 };
  33
  34 enum gp2a_controls {
  35         /* Software Shutdown control: 0 = shutdown, 1 = normal operation */
  36         GP2A_CTRL_SSD   = 0x01
  37 };
  38
  39 static int gp2a_report(struct gp2a_data *dt)
  40 {
  41         int vo = gpio_get_value(dt->pdata->vout_gpio);
  42
  43         input_report_switch(dt->input, SW_FRONT_PROXIMITY, !vo);
  44         input_sync(dt->input);
  45
  46         return 0;
  47 }
  48
  49 static irqreturn_t gp2a_irq(int irq, void *handle)
  50 {
  51         struct gp2a_data *dt = handle;
  52
  53         gp2a_report(dt);
  54
  55         return IRQ_HANDLED;
  56 }
  57
  58 static int gp2a_enable(struct gp2a_data *dt)
  59 {
  60         return i2c_smbus_write_byte_data(dt->i2c_client, GP2A_ADDR_OPMOD,
  61                                          GP2A_CTRL_SSD);
  62 }
  63
  64 static int gp2a_disable(struct gp2a_data *dt)
  65 {
  66         return i2c_smbus_write_byte_data(dt->i2c_client, GP2A_ADDR_OPMOD,
  67                                          0x00);
  68 }
  69
  70 static int gp2a_device_open(struct input_dev *dev)
  71 {
  72         struct gp2a_data *dt = input_get_drvdata(dev);
  73         int error;
  74
  75         error = gp2a_enable(dt);
  76         if (error < 0) {
  77                 dev_err(&dt->i2c_client->dev,
  78                         "unable to activate, err %d\n", error);
  79                 return error;
  80         }
  81
  82         gp2a_report(dt);
  83
  84         return 0;
  85 }
  86
  87 static void gp2a_device_close(struct input_dev *dev)
  88 {
  89         struct gp2a_data *dt = input_get_drvdata(dev);
  90         int error;
  91
  92         error = gp2a_disable(dt);
  93         if (error < 0)
  94                 dev_err(&dt->i2c_client->dev,
  95                         "unable to deactivate, err %d\n", error);
  96 }
  97
  98 static int gp2a_initialize(struct gp2a_data *dt)
  99 {
 100         int error;
 101
 102         error = i2c_smbus_write_byte_data(dt->i2c_client, GP2A_ADDR_GAIN,
 103                                           0x08);
 104         if (error < 0)
 105                 return error;
 106
 107         error = i2c_smbus_write_byte_data(dt->i2c_client, GP2A_ADDR_HYS,
 108                                           0xc2);
 109         if (error < 0)
 110                 return error;
 111
 112         error = i2c_smbus_write_byte_data(dt->i2c_client, GP2A_ADDR_CYCLE,
 113                                           0x04);
 114         if (error < 0)
 115                 return error;
 116
 117         error = gp2a_disable(dt);
 118
 119         return error;
 120 }
 121
 122 static int gp2a_probe(struct i2c_client *client,
 123                                 const struct i2c_device_id *id)
 124 {
 125         const struct gp2a_platform_data *pdata = dev_get_platdata(&client->dev);
 126         struct gp2a_data *dt;
 127         int error;
 128
 129         if (!pdata)
 130                 return -EINVAL;
 131
 132         if (pdata->hw_setup) {
 133                 error = pdata->hw_setup(client);
 134                 if (error < 0)
 135                         return error;
 136         }
 137
 138         error = gpio_request_one(pdata->vout_gpio, GPIOF_IN, GP2A_I2C_NAME);
 139         if (error)
 140                 goto err_hw_shutdown;
 141
 142         dt = kzalloc(sizeof(struct gp2a_data), GFP_KERNEL);
 143         if (!dt) {
 144                 error = -ENOMEM;
 145                 goto err_free_gpio;
 146         }
 147
 148         dt->pdata = pdata;
 149         dt->i2c_client = client;
 150
 151         error = gp2a_initialize(dt);
 152         if (error < 0)
 153                 goto err_free_mem;
 154
 155         dt->input = input_allocate_device();
 156         if (!dt->input) {
 157                 error = -ENOMEM;
 158                 goto err_free_mem;
 159         }
 160
 161         input_set_drvdata(dt->input, dt);
 162
 163         dt->input->open = gp2a_device_open;
 164         dt->input->close = gp2a_device_close;
 165         dt->input->name = GP2A_I2C_NAME;
 166         dt->input->id.bustype = BUS_I2C;
 167         dt->input->dev.parent = &client->dev;
 168
 169         input_set_capability(dt->input, EV_SW, SW_FRONT_PROXIMITY);
 170
 171         error = request_threaded_irq(client->irq, NULL, gp2a_irq,
 172                         IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
 173                                 IRQF_ONESHOT,
 174                         GP2A_I2C_NAME, dt);
 175         if (error) {
 176                 dev_err(&client->dev, "irq request failed\n");
 177                 goto err_free_input_dev;
 178         }
 179
 180         error = input_register_device(dt->input);
 181         if (error) {
 182                 dev_err(&client->dev, "device registration failed\n");
 183                 goto err_free_irq;
 184         }
 185
 186         device_init_wakeup(&client->dev, pdata->wakeup);
 187         i2c_set_clientdata(client, dt);
 188
 189         return 0;
 190
 191 err_free_irq:
 192         free_irq(client->irq, dt);
 193 err_free_input_dev:
 194         input_free_device(dt->input);
 195 err_free_mem:
 196         kfree(dt);
 197 err_free_gpio:
 198         gpio_free(pdata->vout_gpio);
 199 err_hw_shutdown:
 200         if (pdata->hw_shutdown)
 201                 pdata->hw_shutdown(client);
 202         return error;
 203 }
 204
 205 static int gp2a_remove(struct i2c_client *client)
 206 {
 207         struct gp2a_data *dt = i2c_get_clientdata(client);
 208         const struct gp2a_platform_data *pdata = dt->pdata;
 209
 210         free_irq(client->irq, dt);
 211
 212         input_unregister_device(dt->input);
 213         kfree(dt);
 214
 215         gpio_free(pdata->vout_gpio);
 216
 217         if (pdata->hw_shutdown)
 218                 pdata->hw_shutdown(client);
 219
 220         return 0;
 221 }
 222
 223 static int __maybe_unused gp2a_suspend(struct device *dev)
 224 {
 225         struct i2c_client *client = to_i2c_client(dev);
 226         struct gp2a_data *dt = i2c_get_clientdata(client);
 227         int retval = 0;
 228
 229         if (device_may_wakeup(&client->dev)) {
 230                 enable_irq_wake(client->irq);
 231         } else {
 232                 mutex_lock(&dt->input->mutex);
 233                 if (dt->input->users)
 234                         retval = gp2a_disable(dt);
 235                 mutex_unlock(&dt->input->mutex);
 236         }
 237
 238         return retval;
 239 }
 240
 241 static int __maybe_unused gp2a_resume(struct device *dev)
 242 {
 243         struct i2c_client *client = to_i2c_client(dev);
 244         struct gp2a_data *dt = i2c_get_clientdata(client);
 245         int retval = 0;
 246
 247         if (device_may_wakeup(&client->dev)) {
 248                 disable_irq_wake(client->irq);
 249         } else {
 250                 mutex_lock(&dt->input->mutex);
 251                 if (dt->input->users)
 252                         retval = gp2a_enable(dt);
 253                 mutex_unlock(&dt->input->mutex);
 254         }
 255
 256         return retval;
 257 }
 258
 259 static SIMPLE_DEV_PM_OPS(gp2a_pm, gp2a_suspend, gp2a_resume);
 260
 261 static const struct i2c_device_id gp2a_i2c_id[] = {
 262         { GP2A_I2C_NAME, 0 },
 263         { }
 264 };
 265 MODULE_DEVICE_TABLE(i2c, gp2a_i2c_id);
 266
 267 static struct i2c_driver gp2a_i2c_driver = {
 268         .driver = {
 269                 .name   = GP2A_I2C_NAME,
 270                 .pm     = &gp2a_pm,
 271         },
 272         .probe          = gp2a_probe,
 273         .remove         = gp2a_remove,
 274         .id_table       = gp2a_i2c_id,
 275 };
 276
 277 module_i2c_driver(gp2a_i2c_driver);
 278
 279 MODULE_AUTHOR("Courtney Cavin <courtney.cavin@sonyericsson.com>");
 280 MODULE_DESCRIPTION("Sharp GP2AP002A00F I2C Proximity/Opto sensor driver");
 281 MODULE_LICENSE("GPL v2");