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/init.h>
  30 #include <linux/err.h>
  31 #include <linux/i2c.h>
  32 #include <linux/pm_runtime.h>
  33 #include <linux/delay.h>
  34 #include <linux/of.h>
  35 #include <linux/of_platform.h>
  36 #include <linux/of_device.h>
  37
  38 #include "lis3lv02d.h"
  39
  40 #define DRV_NAME        "lis3lv02d_i2c"
  41
  42 static const char reg_vdd[]    = "Vdd";
  43 static const char reg_vdd_io[] = "Vdd_IO";
  44
  45 static int lis3_reg_ctrl(struct lis3lv02d *lis3, bool state)
  46 {
  47         int ret;
  48         if (state == LIS3_REG_OFF) {
  49                 ret = regulator_bulk_disable(ARRAY_SIZE(lis3->regulators),
  50                                         lis3->regulators);
  51         } else {
  52                 ret = regulator_bulk_enable(ARRAY_SIZE(lis3->regulators),
  53                                         lis3->regulators);
  54                 /* Chip needs time to wakeup. Not mentioned in datasheet */
  55                 usleep_range(10000, 20000);
  56         }
  57         return ret;
  58 }
  59
  60 static inline s32 lis3_i2c_write(struct lis3lv02d *lis3, int reg, u8 value)
  61 {
  62         struct i2c_client *c = lis3->bus_priv;
  63         return i2c_smbus_write_byte_data(c, reg, value);
  64 }
  65
  66 static inline s32 lis3_i2c_read(struct lis3lv02d *lis3, int reg, u8 *v)
  67 {
  68         struct i2c_client *c = lis3->bus_priv;
  69         *v = i2c_smbus_read_byte_data(c, reg);
  70         return 0;
  71 }
  72
  73 static inline s32 lis3_i2c_blockread(struct lis3lv02d *lis3, int reg, int len,
  74                                 u8 *v)
  75 {
  76         struct i2c_client *c = lis3->bus_priv;
  77         reg |= (1 << 7); /* 7th bit enables address auto incrementation */
  78         return i2c_smbus_read_i2c_block_data(c, reg, len, v);
  79 }
  80
  81 static int lis3_i2c_init(struct lis3lv02d *lis3)
  82 {
  83         u8 reg;
  84         int ret;
  85
  86         lis3_reg_ctrl(lis3, LIS3_REG_ON);
  87
  88         lis3->read(lis3, WHO_AM_I, &reg);
  89         if (reg != lis3->whoami)
  90                 printk(KERN_ERR "lis3: power on failure\n");
  91
  92         /* power up the device */
  93         ret = lis3->read(lis3, CTRL_REG1, &reg);
  94         if (ret < 0)
  95                 return ret;
  96
  97         if (lis3->whoami == WAI_3DLH)
  98                 reg |= CTRL1_PM0 | CTRL1_Xen | CTRL1_Yen | CTRL1_Zen;
  99         else
 100                 reg |= CTRL1_PD0 | CTRL1_Xen | CTRL1_Yen | CTRL1_Zen;
 101
 102         return lis3->write(lis3, CTRL_REG1, reg);
 103 }
 104
 105 /* Default axis mapping but it can be overwritten by platform data */
 106 static union axis_conversion lis3lv02d_axis_map =
 107         { .as_array = { LIS3_DEV_X, LIS3_DEV_Y, LIS3_DEV_Z } };
 108
 109 #ifdef CONFIG_OF
 110 static struct of_device_id lis3lv02d_i2c_dt_ids[] = {
 111         { .compatible = "st,lis3lv02d" },
 112         {}
 113 };
 114 MODULE_DEVICE_TABLE(of, lis3lv02d_i2c_dt_ids);
 115 #endif
 116
 117 static int lis3lv02d_i2c_probe(struct i2c_client *client,
 118                                         const struct i2c_device_id *id)
 119 {
 120         int ret = 0;
 121         struct lis3lv02d_platform_data *pdata = client->dev.platform_data;
 122
 123 #ifdef CONFIG_OF
 124         if (of_match_device(lis3lv02d_i2c_dt_ids, &client->dev)) {
 125                 lis3_dev.of_node = client->dev.of_node;
 126                 ret = lis3lv02d_init_dt(&lis3_dev);
 127                 if (ret)
 128                         return ret;
 129                 pdata = lis3_dev.pdata;
 130         }
 131 #endif
 132
 133         if (pdata) {
 134                 if ((pdata->driver_features & LIS3_USE_BLOCK_READ) &&
 135                         (i2c_check_functionality(client->adapter,
 136                                                 I2C_FUNC_SMBUS_I2C_BLOCK)))
 137                         lis3_dev.blkread  = lis3_i2c_blockread;
 138
 139                 if (pdata->axis_x)
 140                         lis3lv02d_axis_map.x = pdata->axis_x;
 141
 142                 if (pdata->axis_y)
 143                         lis3lv02d_axis_map.y = pdata->axis_y;
 144
 145                 if (pdata->axis_z)
 146                         lis3lv02d_axis_map.z = pdata->axis_z;
 147
 148                 if (pdata->setup_resources)
 149                         ret = pdata->setup_resources();
 150
 151                 if (ret)
 152                         goto fail;
 153         }
 154
 155         lis3_dev.regulators[0].supply = reg_vdd;
 156         lis3_dev.regulators[1].supply = reg_vdd_io;
 157         ret = regulator_bulk_get(&client->dev,
 158                                  ARRAY_SIZE(lis3_dev.regulators),
 159                                  lis3_dev.regulators);
 160         if (ret < 0)
 161                 goto fail;
 162
 163         lis3_dev.pdata    = pdata;
 164         lis3_dev.bus_priv = client;
 165         lis3_dev.init     = lis3_i2c_init;
 166         lis3_dev.read     = lis3_i2c_read;
 167         lis3_dev.write    = lis3_i2c_write;
 168         lis3_dev.irq      = client->irq;
 169         lis3_dev.ac       = lis3lv02d_axis_map;
 170         lis3_dev.pm_dev   = &client->dev;
 171
 172         i2c_set_clientdata(client, &lis3_dev);
 173
 174         /* Provide power over the init call */
 175         lis3_reg_ctrl(&lis3_dev, LIS3_REG_ON);
 176
 177         ret = lis3lv02d_init_device(&lis3_dev);
 178
 179         lis3_reg_ctrl(&lis3_dev, LIS3_REG_OFF);
 180
 181         if (ret)
 182                 goto fail2;
 183         return 0;
 184
 185 fail2:
 186         regulator_bulk_free(ARRAY_SIZE(lis3_dev.regulators),
 187                                 lis3_dev.regulators);
 188 fail:
 189         if (pdata && pdata->release_resources)
 190                 pdata->release_resources();
 191         return ret;
 192 }
 193
 194 static int lis3lv02d_i2c_remove(struct i2c_client *client)
 195 {
 196         struct lis3lv02d *lis3 = i2c_get_clientdata(client);
 197         struct lis3lv02d_platform_data *pdata = client->dev.platform_data;
 198
 199         if (pdata && pdata->release_resources)
 200                 pdata->release_resources();
 201
 202         lis3lv02d_joystick_disable(lis3);
 203         lis3lv02d_remove_fs(&lis3_dev);
 204
 205         regulator_bulk_free(ARRAY_SIZE(lis3->regulators),
 206                             lis3_dev.regulators);
 207         return 0;
 208 }
 209
 210 #ifdef CONFIG_PM_SLEEP
 211 static int lis3lv02d_i2c_suspend(struct device *dev)
 212 {
 213         struct i2c_client *client = container_of(dev, struct i2c_client, dev);
 214         struct lis3lv02d *lis3 = i2c_get_clientdata(client);
 215
 216         if (!lis3->pdata || !lis3->pdata->wakeup_flags)
 217                 lis3lv02d_poweroff(lis3);
 218         return 0;
 219 }
 220
 221 static int lis3lv02d_i2c_resume(struct device *dev)
 222 {
 223         struct i2c_client *client = container_of(dev, struct i2c_client, dev);
 224         struct lis3lv02d *lis3 = i2c_get_clientdata(client);
 225
 226         /*
 227          * pm_runtime documentation says that devices should always
 228          * be powered on at resume. Pm_runtime turns them off after system
 229          * wide resume is complete.
 230          */
 231         if (!lis3->pdata || !lis3->pdata->wakeup_flags ||
 232                 pm_runtime_suspended(dev))
 233                 lis3lv02d_poweron(lis3);
 234
 235         return 0;
 236 }
 237 #endif /* CONFIG_PM_SLEEP */
 238
 239 #ifdef CONFIG_PM_RUNTIME
 240 static int lis3_i2c_runtime_suspend(struct device *dev)
 241 {
 242         struct i2c_client *client = container_of(dev, struct i2c_client, dev);
 243         struct lis3lv02d *lis3 = i2c_get_clientdata(client);
 244
 245         lis3lv02d_poweroff(lis3);
 246         return 0;
 247 }
 248
 249 static int lis3_i2c_runtime_resume(struct device *dev)
 250 {
 251         struct i2c_client *client = container_of(dev, struct i2c_client, dev);
 252         struct lis3lv02d *lis3 = i2c_get_clientdata(client);
 253
 254         lis3lv02d_poweron(lis3);
 255         return 0;
 256 }
 257 #endif /* CONFIG_PM_RUNTIME */
 258
 259 static const struct i2c_device_id lis3lv02d_id[] = {
 260         {"lis3lv02d", LIS3LV02D},
 261         {"lis331dlh", LIS331DLH},
 262         {}
 263 };
 264
 265 MODULE_DEVICE_TABLE(i2c, lis3lv02d_id);
 266
 267 static const struct dev_pm_ops lis3_pm_ops = {
 268         SET_SYSTEM_SLEEP_PM_OPS(lis3lv02d_i2c_suspend,
 269                                 lis3lv02d_i2c_resume)
 270         SET_RUNTIME_PM_OPS(lis3_i2c_runtime_suspend,
 271                            lis3_i2c_runtime_resume,
 272                            NULL)
 273 };
 274
 275 static struct i2c_driver lis3lv02d_i2c_driver = {
 276         .driver  = {
 277                 .name   = DRV_NAME,
 278                 .owner  = THIS_MODULE,
 279                 .pm     = &lis3_pm_ops,
 280                 .of_match_table = of_match_ptr(lis3lv02d_i2c_dt_ids),
 281         },
 282         .probe  = lis3lv02d_i2c_probe,
 283         .remove = lis3lv02d_i2c_remove,
 284         .id_table = lis3lv02d_id,
 285 };
 286
 287 module_i2c_driver(lis3lv02d_i2c_driver);
 288
 289 MODULE_AUTHOR("Nokia Corporation");
 290 MODULE_DESCRIPTION("lis3lv02d I2C interface");
 291 MODULE_LICENSE("GPL");