Courtney Cavin | ff803ed | 2011-12-11 23:38:27 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2011 Sony Ericsson Mobile Communications Inc. |
| 3 | * |
| 4 | * Author: Courtney Cavin <courtney.cavin@sonyericsson.com> |
| 5 | * Prepared for up-stream by: Oskar Andero <oskar.andero@sonyericsson.com> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License version 2, as |
| 9 | * published by the Free Software Foundation. |
| 10 | */ |
| 11 | |
| 12 | #include <linux/i2c.h> |
| 13 | #include <linux/irq.h> |
| 14 | #include <linux/slab.h> |
| 15 | #include <linux/input.h> |
| 16 | #include <linux/module.h> |
| 17 | #include <linux/interrupt.h> |
| 18 | #include <linux/gpio.h> |
| 19 | #include <linux/delay.h> |
| 20 | #include <linux/input/gp2ap002a00f.h> |
| 21 | |
| 22 | struct gp2a_data { |
| 23 | struct input_dev *input; |
| 24 | const struct gp2a_platform_data *pdata; |
| 25 | struct i2c_client *i2c_client; |
| 26 | }; |
| 27 | |
| 28 | enum gp2a_addr { |
| 29 | GP2A_ADDR_PROX = 0x0, |
| 30 | GP2A_ADDR_GAIN = 0x1, |
| 31 | GP2A_ADDR_HYS = 0x2, |
| 32 | GP2A_ADDR_CYCLE = 0x3, |
| 33 | GP2A_ADDR_OPMOD = 0x4, |
| 34 | GP2A_ADDR_CON = 0x6 |
| 35 | }; |
| 36 | |
| 37 | enum gp2a_controls { |
| 38 | /* Software Shutdown control: 0 = shutdown, 1 = normal operation */ |
| 39 | GP2A_CTRL_SSD = 0x01 |
| 40 | }; |
| 41 | |
| 42 | static int gp2a_report(struct gp2a_data *dt) |
| 43 | { |
| 44 | int vo = gpio_get_value(dt->pdata->vout_gpio); |
| 45 | |
| 46 | input_report_switch(dt->input, SW_FRONT_PROXIMITY, !vo); |
| 47 | input_sync(dt->input); |
| 48 | |
| 49 | return 0; |
| 50 | } |
| 51 | |
| 52 | static irqreturn_t gp2a_irq(int irq, void *handle) |
| 53 | { |
| 54 | struct gp2a_data *dt = handle; |
| 55 | |
| 56 | gp2a_report(dt); |
| 57 | |
| 58 | return IRQ_HANDLED; |
| 59 | } |
| 60 | |
| 61 | static int gp2a_enable(struct gp2a_data *dt) |
| 62 | { |
| 63 | return i2c_smbus_write_byte_data(dt->i2c_client, GP2A_ADDR_OPMOD, |
| 64 | GP2A_CTRL_SSD); |
| 65 | } |
| 66 | |
| 67 | static int gp2a_disable(struct gp2a_data *dt) |
| 68 | { |
| 69 | return i2c_smbus_write_byte_data(dt->i2c_client, GP2A_ADDR_OPMOD, |
| 70 | 0x00); |
| 71 | } |
| 72 | |
| 73 | static int gp2a_device_open(struct input_dev *dev) |
| 74 | { |
| 75 | struct gp2a_data *dt = input_get_drvdata(dev); |
| 76 | int error; |
| 77 | |
| 78 | error = gp2a_enable(dt); |
| 79 | if (error < 0) { |
| 80 | dev_err(&dt->i2c_client->dev, |
| 81 | "unable to activate, err %d\n", error); |
| 82 | return error; |
| 83 | } |
| 84 | |
| 85 | gp2a_report(dt); |
| 86 | |
| 87 | return 0; |
| 88 | } |
| 89 | |
| 90 | static void gp2a_device_close(struct input_dev *dev) |
| 91 | { |
| 92 | struct gp2a_data *dt = input_get_drvdata(dev); |
| 93 | int error; |
| 94 | |
| 95 | error = gp2a_disable(dt); |
| 96 | if (error < 0) |
| 97 | dev_err(&dt->i2c_client->dev, |
| 98 | "unable to deactivate, err %d\n", error); |
| 99 | } |
| 100 | |
| 101 | static int __devinit gp2a_initialize(struct gp2a_data *dt) |
| 102 | { |
| 103 | int error; |
| 104 | |
| 105 | error = i2c_smbus_write_byte_data(dt->i2c_client, GP2A_ADDR_GAIN, |
| 106 | 0x08); |
| 107 | if (error < 0) |
| 108 | return error; |
| 109 | |
| 110 | error = i2c_smbus_write_byte_data(dt->i2c_client, GP2A_ADDR_HYS, |
| 111 | 0xc2); |
| 112 | if (error < 0) |
| 113 | return error; |
| 114 | |
| 115 | error = i2c_smbus_write_byte_data(dt->i2c_client, GP2A_ADDR_CYCLE, |
| 116 | 0x04); |
| 117 | if (error < 0) |
| 118 | return error; |
| 119 | |
| 120 | error = gp2a_disable(dt); |
| 121 | |
| 122 | return error; |
| 123 | } |
| 124 | |
| 125 | static int __devinit gp2a_probe(struct i2c_client *client, |
| 126 | const struct i2c_device_id *id) |
| 127 | { |
| 128 | const struct gp2a_platform_data *pdata = client->dev.platform_data; |
| 129 | struct gp2a_data *dt; |
| 130 | int error; |
| 131 | |
| 132 | if (!pdata) |
| 133 | return -EINVAL; |
| 134 | |
| 135 | if (pdata->hw_setup) { |
| 136 | error = pdata->hw_setup(client); |
| 137 | if (error < 0) |
| 138 | return error; |
| 139 | } |
| 140 | |
| 141 | error = gpio_request_one(pdata->vout_gpio, GPIOF_IN, GP2A_I2C_NAME); |
| 142 | if (error) |
| 143 | goto err_hw_shutdown; |
| 144 | |
| 145 | dt = kzalloc(sizeof(struct gp2a_data), GFP_KERNEL); |
| 146 | if (!dt) { |
| 147 | error = -ENOMEM; |
| 148 | goto err_free_gpio; |
| 149 | } |
| 150 | |
| 151 | dt->pdata = pdata; |
| 152 | dt->i2c_client = client; |
| 153 | |
| 154 | error = gp2a_initialize(dt); |
| 155 | if (error < 0) |
| 156 | goto err_free_mem; |
| 157 | |
| 158 | dt->input = input_allocate_device(); |
| 159 | if (!dt->input) { |
| 160 | error = -ENOMEM; |
| 161 | goto err_free_mem; |
| 162 | } |
| 163 | |
| 164 | input_set_drvdata(dt->input, dt); |
| 165 | |
| 166 | dt->input->open = gp2a_device_open; |
| 167 | dt->input->close = gp2a_device_close; |
| 168 | dt->input->name = GP2A_I2C_NAME; |
| 169 | dt->input->id.bustype = BUS_I2C; |
| 170 | dt->input->dev.parent = &client->dev; |
| 171 | |
| 172 | input_set_capability(dt->input, EV_SW, SW_FRONT_PROXIMITY); |
| 173 | |
| 174 | error = request_threaded_irq(client->irq, NULL, gp2a_irq, |
| 175 | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | |
| 176 | IRQF_ONESHOT, |
| 177 | GP2A_I2C_NAME, dt); |
| 178 | if (error) { |
| 179 | dev_err(&client->dev, "irq request failed\n"); |
| 180 | goto err_free_input_dev; |
| 181 | } |
| 182 | |
| 183 | error = input_register_device(dt->input); |
| 184 | if (error) { |
| 185 | dev_err(&client->dev, "device registration failed\n"); |
| 186 | goto err_free_irq; |
| 187 | } |
| 188 | |
| 189 | device_init_wakeup(&client->dev, pdata->wakeup); |
| 190 | i2c_set_clientdata(client, dt); |
| 191 | |
| 192 | return 0; |
| 193 | |
| 194 | err_free_irq: |
| 195 | free_irq(client->irq, dt); |
| 196 | err_free_input_dev: |
| 197 | input_free_device(dt->input); |
| 198 | err_free_mem: |
| 199 | kfree(dt); |
| 200 | err_free_gpio: |
| 201 | gpio_free(pdata->vout_gpio); |
| 202 | err_hw_shutdown: |
| 203 | if (pdata->hw_shutdown) |
| 204 | pdata->hw_shutdown(client); |
| 205 | return error; |
| 206 | } |
| 207 | |
| 208 | static int __devexit gp2a_remove(struct i2c_client *client) |
| 209 | { |
| 210 | struct gp2a_data *dt = i2c_get_clientdata(client); |
| 211 | const struct gp2a_platform_data *pdata = dt->pdata; |
| 212 | |
| 213 | device_init_wakeup(&client->dev, false); |
| 214 | |
| 215 | free_irq(client->irq, dt); |
| 216 | |
| 217 | input_unregister_device(dt->input); |
| 218 | kfree(dt); |
| 219 | |
| 220 | gpio_free(pdata->vout_gpio); |
| 221 | |
| 222 | if (pdata->hw_shutdown) |
| 223 | pdata->hw_shutdown(client); |
| 224 | |
| 225 | return 0; |
| 226 | } |
| 227 | |
| 228 | #ifdef CONFIG_PM_SLEEP |
| 229 | static int gp2a_suspend(struct device *dev) |
| 230 | { |
| 231 | struct i2c_client *client = to_i2c_client(dev); |
| 232 | struct gp2a_data *dt = i2c_get_clientdata(client); |
| 233 | int retval = 0; |
| 234 | |
| 235 | if (device_may_wakeup(&client->dev)) { |
| 236 | enable_irq_wake(client->irq); |
| 237 | } else { |
| 238 | mutex_lock(&dt->input->mutex); |
| 239 | if (dt->input->users) |
| 240 | retval = gp2a_disable(dt); |
| 241 | mutex_unlock(&dt->input->mutex); |
| 242 | } |
| 243 | |
| 244 | return retval; |
| 245 | } |
| 246 | |
| 247 | static int gp2a_resume(struct device *dev) |
| 248 | { |
| 249 | struct i2c_client *client = to_i2c_client(dev); |
| 250 | struct gp2a_data *dt = i2c_get_clientdata(client); |
| 251 | int retval = 0; |
| 252 | |
| 253 | if (device_may_wakeup(&client->dev)) { |
| 254 | disable_irq_wake(client->irq); |
| 255 | } else { |
| 256 | mutex_lock(&dt->input->mutex); |
| 257 | if (dt->input->users) |
| 258 | retval = gp2a_enable(dt); |
| 259 | mutex_unlock(&dt->input->mutex); |
| 260 | } |
| 261 | |
| 262 | return retval; |
| 263 | } |
| 264 | #endif |
| 265 | |
| 266 | static SIMPLE_DEV_PM_OPS(gp2a_pm, gp2a_suspend, gp2a_resume); |
| 267 | |
| 268 | static const struct i2c_device_id gp2a_i2c_id[] = { |
| 269 | { GP2A_I2C_NAME, 0 }, |
| 270 | { } |
| 271 | }; |
| 272 | |
| 273 | static struct i2c_driver gp2a_i2c_driver = { |
| 274 | .driver = { |
| 275 | .name = GP2A_I2C_NAME, |
| 276 | .owner = THIS_MODULE, |
| 277 | .pm = &gp2a_pm, |
| 278 | }, |
| 279 | .probe = gp2a_probe, |
Bill Pemberton | 1cb0aa8 | 2012-11-23 21:27:39 -0800 | [diff] [blame^] | 280 | .remove = gp2a_remove, |
Courtney Cavin | ff803ed | 2011-12-11 23:38:27 -0800 | [diff] [blame] | 281 | .id_table = gp2a_i2c_id, |
| 282 | }; |
| 283 | |
Dmitry Torokhov | 4a53383 | 2012-03-16 23:05:44 -0700 | [diff] [blame] | 284 | module_i2c_driver(gp2a_i2c_driver); |
Courtney Cavin | ff803ed | 2011-12-11 23:38:27 -0800 | [diff] [blame] | 285 | |
| 286 | MODULE_AUTHOR("Courtney Cavin <courtney.cavin@sonyericsson.com>"); |
| 287 | MODULE_DESCRIPTION("Sharp GP2AP002A00F I2C Proximity/Opto sensor driver"); |
| 288 | MODULE_LICENSE("GPL v2"); |