drivers/media/i2c/dw9714.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 // Copyright (c) 2015--2017 Intel Corporation.
   3
   4 #include <linux/delay.h>
   5 #include <linux/i2c.h>
   6 #include <linux/module.h>
   7 #include <linux/pm_runtime.h>
   8 #include <media/v4l2-ctrls.h>
   9 #include <media/v4l2-device.h>
  10
  11 #define DW9714_NAME             "dw9714"
  12 #define DW9714_MAX_FOCUS_POS    1023
  13 /*
  14  * This sets the minimum granularity for the focus positions.
  15  * A value of 1 gives maximum accuracy for a desired focus position
  16  */
  17 #define DW9714_FOCUS_STEPS      1
  18 /*
  19  * This acts as the minimum granularity of lens movement.
  20  * Keep this value power of 2, so the control steps can be
  21  * uniformly adjusted for gradual lens movement, with desired
  22  * number of control steps.
  23  */
  24 #define DW9714_CTRL_STEPS       16
  25 #define DW9714_CTRL_DELAY_US    1000
  26 /*
  27  * S[3:2] = 0x00, codes per step for "Linear Slope Control"
  28  * S[1:0] = 0x00, step period
  29  */
  30 #define DW9714_DEFAULT_S 0x0
  31 #define DW9714_VAL(data, s) ((data) << 4 | (s))
  32
  33 /* dw9714 device structure */
  34 struct dw9714_device {
  35         struct v4l2_ctrl_handler ctrls_vcm;
  36         struct v4l2_subdev sd;
  37         u16 current_val;
  38 };
  39
  40 static inline struct dw9714_device *to_dw9714_vcm(struct v4l2_ctrl *ctrl)
  41 {
  42         return container_of(ctrl->handler, struct dw9714_device, ctrls_vcm);
  43 }
  44
  45 static inline struct dw9714_device *sd_to_dw9714_vcm(struct v4l2_subdev *subdev)
  46 {
  47         return container_of(subdev, struct dw9714_device, sd);
  48 }
  49
  50 static int dw9714_i2c_write(struct i2c_client *client, u16 data)
  51 {
  52         int ret;
  53         __be16 val = cpu_to_be16(data);
  54
  55         ret = i2c_master_send(client, (const char *)&val, sizeof(val));
  56         if (ret != sizeof(val)) {
  57                 dev_err(&client->dev, "I2C write fail\n");
  58                 return -EIO;
  59         }
  60         return 0;
  61 }
  62
  63 static int dw9714_t_focus_vcm(struct dw9714_device *dw9714_dev, u16 val)
  64 {
  65         struct i2c_client *client = v4l2_get_subdevdata(&dw9714_dev->sd);
  66
  67         dw9714_dev->current_val = val;
  68
  69         return dw9714_i2c_write(client, DW9714_VAL(val, DW9714_DEFAULT_S));
  70 }
  71
  72 static int dw9714_set_ctrl(struct v4l2_ctrl *ctrl)
  73 {
  74         struct dw9714_device *dev_vcm = to_dw9714_vcm(ctrl);
  75
  76         if (ctrl->id == V4L2_CID_FOCUS_ABSOLUTE)
  77                 return dw9714_t_focus_vcm(dev_vcm, ctrl->val);
  78
  79         return -EINVAL;
  80 }
  81
  82 static const struct v4l2_ctrl_ops dw9714_vcm_ctrl_ops = {
  83         .s_ctrl = dw9714_set_ctrl,
  84 };
  85
  86 static int dw9714_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
  87 {
  88         int rval;
  89
  90         rval = pm_runtime_get_sync(sd->dev);
  91         if (rval < 0) {
  92                 pm_runtime_put_noidle(sd->dev);
  93                 return rval;
  94         }
  95
  96         return 0;
  97 }
  98
  99 static int dw9714_close(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
 100 {
 101         pm_runtime_put(sd->dev);
 102
 103         return 0;
 104 }
 105
 106 static const struct v4l2_subdev_internal_ops dw9714_int_ops = {
 107         .open = dw9714_open,
 108         .close = dw9714_close,
 109 };
 110
 111 static const struct v4l2_subdev_ops dw9714_ops = { };
 112
 113 static void dw9714_subdev_cleanup(struct dw9714_device *dw9714_dev)
 114 {
 115         v4l2_async_unregister_subdev(&dw9714_dev->sd);
 116         v4l2_ctrl_handler_free(&dw9714_dev->ctrls_vcm);
 117         media_entity_cleanup(&dw9714_dev->sd.entity);
 118 }
 119
 120 static int dw9714_init_controls(struct dw9714_device *dev_vcm)
 121 {
 122         struct v4l2_ctrl_handler *hdl = &dev_vcm->ctrls_vcm;
 123         const struct v4l2_ctrl_ops *ops = &dw9714_vcm_ctrl_ops;
 124
 125         v4l2_ctrl_handler_init(hdl, 1);
 126
 127         v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FOCUS_ABSOLUTE,
 128                           0, DW9714_MAX_FOCUS_POS, DW9714_FOCUS_STEPS, 0);
 129
 130         if (hdl->error)
 131                 dev_err(dev_vcm->sd.dev, "%s fail error: 0x%x\n",
 132                         __func__, hdl->error);
 133         dev_vcm->sd.ctrl_handler = hdl;
 134         return hdl->error;
 135 }
 136
 137 static int dw9714_probe(struct i2c_client *client)
 138 {
 139         struct dw9714_device *dw9714_dev;
 140         int rval;
 141
 142         dw9714_dev = devm_kzalloc(&client->dev, sizeof(*dw9714_dev),
 143                                   GFP_KERNEL);
 144         if (dw9714_dev == NULL)
 145                 return -ENOMEM;
 146
 147         v4l2_i2c_subdev_init(&dw9714_dev->sd, client, &dw9714_ops);
 148         dw9714_dev->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
 149         dw9714_dev->sd.internal_ops = &dw9714_int_ops;
 150
 151         rval = dw9714_init_controls(dw9714_dev);
 152         if (rval)
 153                 goto err_cleanup;
 154
 155         rval = media_entity_pads_init(&dw9714_dev->sd.entity, 0, NULL);
 156         if (rval < 0)
 157                 goto err_cleanup;
 158
 159         dw9714_dev->sd.entity.function = MEDIA_ENT_F_LENS;
 160
 161         rval = v4l2_async_register_subdev(&dw9714_dev->sd);
 162         if (rval < 0)
 163                 goto err_cleanup;
 164
 165         pm_runtime_set_active(&client->dev);
 166         pm_runtime_enable(&client->dev);
 167         pm_runtime_idle(&client->dev);
 168
 169         return 0;
 170
 171 err_cleanup:
 172         dw9714_subdev_cleanup(dw9714_dev);
 173         dev_err(&client->dev, "Probe failed: %d\n", rval);
 174         return rval;
 175 }
 176
 177 static int dw9714_remove(struct i2c_client *client)
 178 {
 179         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 180         struct dw9714_device *dw9714_dev = sd_to_dw9714_vcm(sd);
 181
 182         pm_runtime_disable(&client->dev);
 183         dw9714_subdev_cleanup(dw9714_dev);
 184
 185         return 0;
 186 }
 187
 188 /*
 189  * This function sets the vcm position, so it consumes least current
 190  * The lens position is gradually moved in units of DW9714_CTRL_STEPS,
 191  * to make the movements smoothly.
 192  */
 193 static int __maybe_unused dw9714_vcm_suspend(struct device *dev)
 194 {
 195         struct i2c_client *client = to_i2c_client(dev);
 196         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 197         struct dw9714_device *dw9714_dev = sd_to_dw9714_vcm(sd);
 198         int ret, val;
 199
 200         for (val = dw9714_dev->current_val & ~(DW9714_CTRL_STEPS - 1);
 201              val >= 0; val -= DW9714_CTRL_STEPS) {
 202                 ret = dw9714_i2c_write(client,
 203                                        DW9714_VAL(val, DW9714_DEFAULT_S));
 204                 if (ret)
 205                         dev_err_once(dev, "%s I2C failure: %d", __func__, ret);
 206                 usleep_range(DW9714_CTRL_DELAY_US, DW9714_CTRL_DELAY_US + 10);
 207         }
 208         return 0;
 209 }
 210
 211 /*
 212  * This function sets the vcm position to the value set by the user
 213  * through v4l2_ctrl_ops s_ctrl handler
 214  * The lens position is gradually moved in units of DW9714_CTRL_STEPS,
 215  * to make the movements smoothly.
 216  */
 217 static int  __maybe_unused dw9714_vcm_resume(struct device *dev)
 218 {
 219         struct i2c_client *client = to_i2c_client(dev);
 220         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 221         struct dw9714_device *dw9714_dev = sd_to_dw9714_vcm(sd);
 222         int ret, val;
 223
 224         for (val = dw9714_dev->current_val % DW9714_CTRL_STEPS;
 225              val < dw9714_dev->current_val + DW9714_CTRL_STEPS - 1;
 226              val += DW9714_CTRL_STEPS) {
 227                 ret = dw9714_i2c_write(client,
 228                                        DW9714_VAL(val, DW9714_DEFAULT_S));
 229                 if (ret)
 230                         dev_err_ratelimited(dev, "%s I2C failure: %d",
 231                                                 __func__, ret);
 232                 usleep_range(DW9714_CTRL_DELAY_US, DW9714_CTRL_DELAY_US + 10);
 233         }
 234
 235         return 0;
 236 }
 237
 238 static const struct i2c_device_id dw9714_id_table[] = {
 239         { DW9714_NAME, 0 },
 240         { { 0 } }
 241 };
 242 MODULE_DEVICE_TABLE(i2c, dw9714_id_table);
 243
 244 static const struct of_device_id dw9714_of_table[] = {
 245         { .compatible = "dongwoon,dw9714" },
 246         { { 0 } }
 247 };
 248 MODULE_DEVICE_TABLE(of, dw9714_of_table);
 249
 250 static const struct dev_pm_ops dw9714_pm_ops = {
 251         SET_SYSTEM_SLEEP_PM_OPS(dw9714_vcm_suspend, dw9714_vcm_resume)
 252         SET_RUNTIME_PM_OPS(dw9714_vcm_suspend, dw9714_vcm_resume, NULL)
 253 };
 254
 255 static struct i2c_driver dw9714_i2c_driver = {
 256         .driver = {
 257                 .name = DW9714_NAME,
 258                 .pm = &dw9714_pm_ops,
 259                 .of_match_table = dw9714_of_table,
 260         },
 261         .probe_new = dw9714_probe,
 262         .remove = dw9714_remove,
 263         .id_table = dw9714_id_table,
 264 };
 265
 266 module_i2c_driver(dw9714_i2c_driver);
 267
 268 MODULE_AUTHOR("Tianshu Qiu <tian.shu.qiu@intel.com>");
 269 MODULE_AUTHOR("Jian Xu Zheng <jian.xu.zheng@intel.com>");
 270 MODULE_AUTHOR("Yuning Pu <yuning.pu@intel.com>");
 271 MODULE_AUTHOR("Jouni Ukkonen <jouni.ukkonen@intel.com>");
 272 MODULE_AUTHOR("Tommi Franttila <tommi.franttila@intel.com>");
 273 MODULE_DESCRIPTION("DW9714 VCM driver");
 274 MODULE_LICENSE("GPL v2");