drivers/misc/lis3lv02d/lis3lv02d_i2c.c

   1 /*
   2  * drivers/hwmon/lis3lv02d_i2c.c
   3  *
   4  * Implements I2C interface for lis3lv02d (STMicroelectronics) accelerometer.
   5  * Driver is based on corresponding SPI driver written by Daniel Mack
   6  * (lis3lv02d_spi.c (C) 2009 Daniel Mack <daniel@caiaq.de> ).
   7  *
   8  * Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
   9  *
  10  * Contact: Samu Onkalo <samu.p.onkalo@nokia.com>
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * version 2 as published by the Free Software Foundation.
  15  *
  16  * This program is distributed in the hope that it will be useful, but
  17  * WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19  * General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  24  * 02110-1301 USA
  25  */
  26
  27 #include <linux/module.h>
  28 #include <linux/kernel.h>
  29 #include <linux/err.h>
  30 #include <linux/i2c.h>
  31 #include <linux/pm_runtime.h>
  32 #include <linux/delay.h>
  33 #include <linux/of.h>
  34 #include <linux/of_platform.h>
  35 #include <linux/of_device.h>
  36
  37 #include "lis3lv02d.h"
  38
  39 #define DRV_NAME        "lis3lv02d_i2c"
  40
  41 static const char reg_vdd[]    = "Vdd";
  42 static const char reg_vdd_io[] = "Vdd_IO";
  43
  44 static int lis3_reg_ctrl(struct lis3lv02d *lis3, bool state)
  45 {
  46         int ret;
  47         if (state == LIS3_REG_OFF) {
  48                 ret = regulator_bulk_disable(ARRAY_SIZE(lis3->regulators),
  49                                         lis3->regulators);
  50         } else {
  51                 ret = regulator_bulk_enable(ARRAY_SIZE(lis3->regulators),
  52                                         lis3->regulators);
  53                 /* Chip needs time to wakeup. Not mentioned in datasheet */
  54                 usleep_range(10000, 20000);
  55         }
  56         return ret;
  57 }
  58
  59 static inline s32 lis3_i2c_write(struct lis3lv02d *lis3, int reg, u8 value)
  60 {
  61         struct i2c_client *c = lis3->bus_priv;
  62         return i2c_smbus_write_byte_data(c, reg, value);
  63 }
  64
  65 static inline s32 lis3_i2c_read(struct lis3lv02d *lis3, int reg, u8 *v)
  66 {
  67         struct i2c_client *c = lis3->bus_priv;
  68         *v = i2c_smbus_read_byte_data(c, reg);
  69         return 0;
  70 }
  71
  72 static inline s32 lis3_i2c_blockread(struct lis3lv02d *lis3, int reg, int len,
  73                                 u8 *v)
  74 {
  75         struct i2c_client *c = lis3->bus_priv;
  76         reg |= (1 << 7); /* 7th bit enables address auto incrementation */
  77         return i2c_smbus_read_i2c_block_data(c, reg, len, v);
  78 }
  79
  80 static int lis3_i2c_init(struct lis3lv02d *lis3)
  81 {
  82         u8 reg;
  83         int ret;
  84
  85         lis3_reg_ctrl(lis3, LIS3_REG_ON);
  86
  87         lis3->read(lis3, WHO_AM_I, &reg);
  88         if (reg != lis3->whoami)
  89                 printk(KERN_ERR "lis3: power on failure\n");
  90
  91         /* power up the device */
  92         ret = lis3->read(lis3, CTRL_REG1, &reg);
  93         if (ret < 0)
  94                 return ret;
  95
  96         if (lis3->whoami == WAI_3DLH)
  97                 reg |= CTRL1_PM0 | CTRL1_Xen | CTRL1_Yen | CTRL1_Zen;
  98         else
  99                 reg |= CTRL1_PD0 | CTRL1_Xen | CTRL1_Yen | CTRL1_Zen;
 100
 101         return lis3->write(lis3, CTRL_REG1, reg);
 102 }
 103
 104 /* Default axis mapping but it can be overwritten by platform data */
 105 static union axis_conversion lis3lv02d_axis_map =
 106         { .as_array = { LIS3_DEV_X, LIS3_DEV_Y, LIS3_DEV_Z } };
 107
 108 #ifdef CONFIG_OF
 109 static const struct of_device_id lis3lv02d_i2c_dt_ids[] = {
 110         { .compatible = "st,lis3lv02d" },
 111         {}
 112 };
 113 MODULE_DEVICE_TABLE(of, lis3lv02d_i2c_dt_ids);
 114 #endif
 115
 116 static int lis3lv02d_i2c_probe(struct i2c_client *client,
 117                                         const struct i2c_device_id *id)
 118 {
 119         int ret = 0;
 120         struct lis3lv02d_platform_data *pdata = client->dev.platform_data;
 121
 122 #ifdef CONFIG_OF
 123         if (of_match_device(lis3lv02d_i2c_dt_ids, &client->dev)) {
 124                 lis3_dev.of_node = client->dev.of_node;
 125                 ret = lis3lv02d_init_dt(&lis3_dev);
 126                 if (ret)
 127                         return ret;
 128                 pdata = lis3_dev.pdata;
 129         }
 130 #endif
 131
 132         if (pdata) {
 133                 if ((pdata->driver_features & LIS3_USE_BLOCK_READ) &&
 134                         (i2c_check_functionality(client->adapter,
 135                                                 I2C_FUNC_SMBUS_I2C_BLOCK)))
 136                         lis3_dev.blkread  = lis3_i2c_blockread;
 137
 138                 if (pdata->axis_x)
 139                         lis3lv02d_axis_map.x = pdata->axis_x;
 140
 141                 if (pdata->axis_y)
 142                         lis3lv02d_axis_map.y = pdata->axis_y;
 143
 144                 if (pdata->axis_z)
 145                         lis3lv02d_axis_map.z = pdata->axis_z;
 146
 147                 if (pdata->setup_resources)
 148                         ret = pdata->setup_resources();
 149
 150                 if (ret)
 151                         goto fail;
 152         }
 153
 154         lis3_dev.regulators[0].supply = reg_vdd;
 155         lis3_dev.regulators[1].supply = reg_vdd_io;
 156         ret = regulator_bulk_get(&client->dev,
 157                                  ARRAY_SIZE(lis3_dev.regulators),
 158                                  lis3_dev.regulators);
 159         if (ret < 0)
 160                 goto fail;
 161
 162         lis3_dev.pdata    = pdata;
 163         lis3_dev.bus_priv = client;
 164         lis3_dev.init     = lis3_i2c_init;
 165         lis3_dev.read     = lis3_i2c_read;
 166         lis3_dev.write    = lis3_i2c_write;
 167         lis3_dev.irq      = client->irq;
 168         lis3_dev.ac       = lis3lv02d_axis_map;
 169         lis3_dev.pm_dev   = &client->dev;
 170
 171         i2c_set_clientdata(client, &lis3_dev);
 172
 173         /* Provide power over the init call */
 174         lis3_reg_ctrl(&lis3_dev, LIS3_REG_ON);
 175
 176         ret = lis3lv02d_init_device(&lis3_dev);
 177
 178         lis3_reg_ctrl(&lis3_dev, LIS3_REG_OFF);
 179
 180         if (ret)
 181                 goto fail2;
 182         return 0;
 183
 184 fail2:
 185         regulator_bulk_free(ARRAY_SIZE(lis3_dev.regulators),
 186                                 lis3_dev.regulators);
 187 fail:
 188         if (pdata && pdata->release_resources)
 189                 pdata->release_resources();
 190         return ret;
 191 }
 192
 193 static int lis3lv02d_i2c_remove(struct i2c_client *client)
 194 {
 195         struct lis3lv02d *lis3 = i2c_get_clientdata(client);
 196         struct lis3lv02d_platform_data *pdata = client->dev.platform_data;
 197
 198         if (pdata && pdata->release_resources)
 199                 pdata->release_resources();
 200
 201         lis3lv02d_joystick_disable(lis3);
 202         lis3lv02d_remove_fs(&lis3_dev);
 203
 204         regulator_bulk_free(ARRAY_SIZE(lis3->regulators),
 205                             lis3_dev.regulators);
 206         return 0;
 207 }
 208
 209 #ifdef CONFIG_PM_SLEEP
 210 static int lis3lv02d_i2c_suspend(struct device *dev)
 211 {
 212         struct i2c_client *client = to_i2c_client(dev);
 213         struct lis3lv02d *lis3 = i2c_get_clientdata(client);
 214
 215         if (!lis3->pdata || !lis3->pdata->wakeup_flags)
 216                 lis3lv02d_poweroff(lis3);
 217         return 0;
 218 }
 219
 220 static int lis3lv02d_i2c_resume(struct device *dev)
 221 {
 222         struct i2c_client *client = to_i2c_client(dev);
 223         struct lis3lv02d *lis3 = i2c_get_clientdata(client);
 224
 225         /*
 226          * pm_runtime documentation says that devices should always
 227          * be powered on at resume. Pm_runtime turns them off after system
 228          * wide resume is complete.
 229          */
 230         if (!lis3->pdata || !lis3->pdata->wakeup_flags ||
 231                 pm_runtime_suspended(dev))
 232                 lis3lv02d_poweron(lis3);
 233
 234         return 0;
 235 }
 236 #endif /* CONFIG_PM_SLEEP */
 237
 238 #ifdef CONFIG_PM
 239 static int lis3_i2c_runtime_suspend(struct device *dev)
 240 {
 241         struct i2c_client *client = to_i2c_client(dev);
 242         struct lis3lv02d *lis3 = i2c_get_clientdata(client);
 243
 244         lis3lv02d_poweroff(lis3);
 245         return 0;
 246 }
 247
 248 static int lis3_i2c_runtime_resume(struct device *dev)
 249 {
 250         struct i2c_client *client = to_i2c_client(dev);
 251         struct lis3lv02d *lis3 = i2c_get_clientdata(client);
 252
 253         lis3lv02d_poweron(lis3);
 254         return 0;
 255 }
 256 #endif /* CONFIG_PM */
 257
 258 static const struct i2c_device_id lis3lv02d_id[] = {
 259         {"lis3lv02d", LIS3LV02D},
 260         {"lis331dlh", LIS331DLH},
 261         {}
 262 };
 263
 264 MODULE_DEVICE_TABLE(i2c, lis3lv02d_id);
 265
 266 static const struct dev_pm_ops lis3_pm_ops = {
 267         SET_SYSTEM_SLEEP_PM_OPS(lis3lv02d_i2c_suspend,
 268                                 lis3lv02d_i2c_resume)
 269         SET_RUNTIME_PM_OPS(lis3_i2c_runtime_suspend,
 270                            lis3_i2c_runtime_resume,
 271                            NULL)
 272 };
 273
 274 static struct i2c_driver lis3lv02d_i2c_driver = {
 275         .driver  = {
 276                 .name   = DRV_NAME,
 277                 .pm     = &lis3_pm_ops,
 278                 .of_match_table = of_match_ptr(lis3lv02d_i2c_dt_ids),
 279         },
 280         .probe  = lis3lv02d_i2c_probe,
 281         .remove = lis3lv02d_i2c_remove,
 282         .id_table = lis3lv02d_id,
 283 };
 284
 285 module_i2c_driver(lis3lv02d_i2c_driver);
 286
 287 MODULE_AUTHOR("Nokia Corporation");
 288 MODULE_DESCRIPTION("lis3lv02d I2C interface");
 289 MODULE_LICENSE("GPL");