1 // SPDX-License-Identifier: GPL-2.0 2 // Copyright (C) 2018 Intel Corporation 3 4 #include <linux/acpi.h> 5 #include <linux/delay.h> 6 #include <linux/i2c.h> 7 #include <linux/iopoll.h> 8 #include <linux/module.h> 9 #include <linux/pm_runtime.h> 10 #include <media/v4l2-ctrls.h> 11 #include <media/v4l2-device.h> 12 13 #define DW9807_MAX_FOCUS_POS 1023 14 /* 15 * This sets the minimum granularity for the focus positions. 16 * A value of 1 gives maximum accuracy for a desired focus position. 17 */ 18 #define DW9807_FOCUS_STEPS 1 19 /* 20 * This acts as the minimum granularity of lens movement. 21 * Keep this value power of 2, so the control steps can be 22 * uniformly adjusted for gradual lens movement, with desired 23 * number of control steps. 24 */ 25 #define DW9807_CTRL_STEPS 16 26 #define DW9807_CTRL_DELAY_US 1000 27 28 #define DW9807_CTL_ADDR 0x02 29 /* 30 * DW9807 separates two registers to control the VCM position. 31 * One for MSB value, another is LSB value. 32 */ 33 #define DW9807_MSB_ADDR 0x03 34 #define DW9807_LSB_ADDR 0x04 35 #define DW9807_STATUS_ADDR 0x05 36 #define DW9807_MODE_ADDR 0x06 37 #define DW9807_RESONANCE_ADDR 0x07 38 39 #define MAX_RETRY 10 40 41 struct dw9807_device { 42 struct v4l2_ctrl_handler ctrls_vcm; 43 struct v4l2_subdev sd; 44 u16 current_val; 45 }; 46 47 static inline struct dw9807_device *sd_to_dw9807_vcm( 48 struct v4l2_subdev *subdev) 49 { 50 return container_of(subdev, struct dw9807_device, sd); 51 } 52 53 static int dw9807_i2c_check(struct i2c_client *client) 54 { 55 const char status_addr = DW9807_STATUS_ADDR; 56 char status_result; 57 int ret; 58 59 ret = i2c_master_send(client, &status_addr, sizeof(status_addr)); 60 if (ret < 0) { 61 dev_err(&client->dev, "I2C write STATUS address fail ret = %d\n", 62 ret); 63 return ret; 64 } 65 66 ret = i2c_master_recv(client, &status_result, sizeof(status_result)); 67 if (ret < 0) { 68 dev_err(&client->dev, "I2C read STATUS value fail ret = %d\n", 69 ret); 70 return ret; 71 } 72 73 return status_result; 74 } 75 76 static int dw9807_set_dac(struct i2c_client *client, u16 data) 77 { 78 const char tx_data[3] = { 79 DW9807_MSB_ADDR, ((data >> 8) & 0x03), (data & 0xff) 80 }; 81 int val, ret; 82 83 /* 84 * According to the datasheet, need to check the bus status before we 85 * write VCM position. This ensure that we really write the value 86 * into the register 87 */ 88 ret = readx_poll_timeout(dw9807_i2c_check, client, val, val <= 0, 89 DW9807_CTRL_DELAY_US, MAX_RETRY * DW9807_CTRL_DELAY_US); 90 91 if (ret || val < 0) { 92 if (ret) { 93 dev_warn(&client->dev, 94 "Cannot do the write operation because VCM is busy\n"); 95 } 96 97 return ret ? -EBUSY : val; 98 } 99 100 /* Write VCM position to registers */ 101 ret = i2c_master_send(client, tx_data, sizeof(tx_data)); 102 if (ret < 0) { 103 dev_err(&client->dev, 104 "I2C write MSB fail ret=%d\n", ret); 105 106 return ret; 107 } 108 109 return 0; 110 } 111 112 static int dw9807_set_ctrl(struct v4l2_ctrl *ctrl) 113 { 114 struct dw9807_device *dev_vcm = container_of(ctrl->handler, 115 struct dw9807_device, ctrls_vcm); 116 117 if (ctrl->id == V4L2_CID_FOCUS_ABSOLUTE) { 118 struct i2c_client *client = v4l2_get_subdevdata(&dev_vcm->sd); 119 120 dev_vcm->current_val = ctrl->val; 121 return dw9807_set_dac(client, ctrl->val); 122 } 123 124 return -EINVAL; 125 } 126 127 static const struct v4l2_ctrl_ops dw9807_vcm_ctrl_ops = { 128 .s_ctrl = dw9807_set_ctrl, 129 }; 130 131 static int dw9807_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh) 132 { 133 int rval; 134 135 rval = pm_runtime_get_sync(sd->dev); 136 if (rval < 0) { 137 pm_runtime_put_noidle(sd->dev); 138 return rval; 139 } 140 141 return 0; 142 } 143 144 static int dw9807_close(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh) 145 { 146 pm_runtime_put(sd->dev); 147 148 return 0; 149 } 150 151 static const struct v4l2_subdev_internal_ops dw9807_int_ops = { 152 .open = dw9807_open, 153 .close = dw9807_close, 154 }; 155 156 static const struct v4l2_subdev_ops dw9807_ops = { }; 157 158 static void dw9807_subdev_cleanup(struct dw9807_device *dw9807_dev) 159 { 160 v4l2_async_unregister_subdev(&dw9807_dev->sd); 161 v4l2_ctrl_handler_free(&dw9807_dev->ctrls_vcm); 162 media_entity_cleanup(&dw9807_dev->sd.entity); 163 } 164 165 static int dw9807_init_controls(struct dw9807_device *dev_vcm) 166 { 167 struct v4l2_ctrl_handler *hdl = &dev_vcm->ctrls_vcm; 168 const struct v4l2_ctrl_ops *ops = &dw9807_vcm_ctrl_ops; 169 struct i2c_client *client = v4l2_get_subdevdata(&dev_vcm->sd); 170 171 v4l2_ctrl_handler_init(hdl, 1); 172 173 v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FOCUS_ABSOLUTE, 174 0, DW9807_MAX_FOCUS_POS, DW9807_FOCUS_STEPS, 0); 175 176 dev_vcm->sd.ctrl_handler = hdl; 177 if (hdl->error) { 178 dev_err(&client->dev, "%s fail error: 0x%x\n", 179 __func__, hdl->error); 180 return hdl->error; 181 } 182 183 return 0; 184 } 185 186 static int dw9807_probe(struct i2c_client *client) 187 { 188 struct dw9807_device *dw9807_dev; 189 int rval; 190 191 dw9807_dev = devm_kzalloc(&client->dev, sizeof(*dw9807_dev), 192 GFP_KERNEL); 193 if (dw9807_dev == NULL) 194 return -ENOMEM; 195 196 v4l2_i2c_subdev_init(&dw9807_dev->sd, client, &dw9807_ops); 197 dw9807_dev->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE; 198 dw9807_dev->sd.internal_ops = &dw9807_int_ops; 199 200 rval = dw9807_init_controls(dw9807_dev); 201 if (rval) 202 goto err_cleanup; 203 204 rval = media_entity_pads_init(&dw9807_dev->sd.entity, 0, NULL); 205 if (rval < 0) 206 goto err_cleanup; 207 208 dw9807_dev->sd.entity.function = MEDIA_ENT_F_LENS; 209 210 rval = v4l2_async_register_subdev(&dw9807_dev->sd); 211 if (rval < 0) 212 goto err_cleanup; 213 214 pm_runtime_set_active(&client->dev); 215 pm_runtime_enable(&client->dev); 216 pm_runtime_idle(&client->dev); 217 218 return 0; 219 220 err_cleanup: 221 v4l2_ctrl_handler_free(&dw9807_dev->ctrls_vcm); 222 media_entity_cleanup(&dw9807_dev->sd.entity); 223 224 return rval; 225 } 226 227 static int dw9807_remove(struct i2c_client *client) 228 { 229 struct v4l2_subdev *sd = i2c_get_clientdata(client); 230 struct dw9807_device *dw9807_dev = sd_to_dw9807_vcm(sd); 231 232 pm_runtime_disable(&client->dev); 233 234 dw9807_subdev_cleanup(dw9807_dev); 235 236 return 0; 237 } 238 239 /* 240 * This function sets the vcm position, so it consumes least current 241 * The lens position is gradually moved in units of DW9807_CTRL_STEPS, 242 * to make the movements smoothly. 243 */ 244 static int __maybe_unused dw9807_vcm_suspend(struct device *dev) 245 { 246 struct i2c_client *client = to_i2c_client(dev); 247 struct v4l2_subdev *sd = i2c_get_clientdata(client); 248 struct dw9807_device *dw9807_dev = sd_to_dw9807_vcm(sd); 249 const char tx_data[2] = { DW9807_CTL_ADDR, 0x01 }; 250 int ret, val; 251 252 for (val = dw9807_dev->current_val & ~(DW9807_CTRL_STEPS - 1); 253 val >= 0; val -= DW9807_CTRL_STEPS) { 254 ret = dw9807_set_dac(client, val); 255 if (ret) 256 dev_err_once(dev, "%s I2C failure: %d", __func__, ret); 257 usleep_range(DW9807_CTRL_DELAY_US, DW9807_CTRL_DELAY_US + 10); 258 } 259 260 /* Power down */ 261 ret = i2c_master_send(client, tx_data, sizeof(tx_data)); 262 if (ret < 0) { 263 dev_err(&client->dev, "I2C write CTL fail ret = %d\n", ret); 264 return ret; 265 } 266 267 return 0; 268 } 269 270 /* 271 * This function sets the vcm position to the value set by the user 272 * through v4l2_ctrl_ops s_ctrl handler 273 * The lens position is gradually moved in units of DW9807_CTRL_STEPS, 274 * to make the movements smoothly. 275 */ 276 static int __maybe_unused dw9807_vcm_resume(struct device *dev) 277 { 278 struct i2c_client *client = to_i2c_client(dev); 279 struct v4l2_subdev *sd = i2c_get_clientdata(client); 280 struct dw9807_device *dw9807_dev = sd_to_dw9807_vcm(sd); 281 const char tx_data[2] = { DW9807_CTL_ADDR, 0x00 }; 282 int ret, val; 283 284 /* Power on */ 285 ret = i2c_master_send(client, tx_data, sizeof(tx_data)); 286 if (ret < 0) { 287 dev_err(&client->dev, "I2C write CTL fail ret = %d\n", ret); 288 return ret; 289 } 290 291 for (val = dw9807_dev->current_val % DW9807_CTRL_STEPS; 292 val < dw9807_dev->current_val + DW9807_CTRL_STEPS - 1; 293 val += DW9807_CTRL_STEPS) { 294 ret = dw9807_set_dac(client, val); 295 if (ret) 296 dev_err_ratelimited(dev, "%s I2C failure: %d", 297 __func__, ret); 298 usleep_range(DW9807_CTRL_DELAY_US, DW9807_CTRL_DELAY_US + 10); 299 } 300 301 return 0; 302 } 303 304 static const struct of_device_id dw9807_of_table[] = { 305 { .compatible = "dongwoon,dw9807-vcm" }, 306 { /* sentinel */ } 307 }; 308 MODULE_DEVICE_TABLE(of, dw9807_of_table); 309 310 static const struct dev_pm_ops dw9807_pm_ops = { 311 SET_SYSTEM_SLEEP_PM_OPS(dw9807_vcm_suspend, dw9807_vcm_resume) 312 SET_RUNTIME_PM_OPS(dw9807_vcm_suspend, dw9807_vcm_resume, NULL) 313 }; 314 315 static struct i2c_driver dw9807_i2c_driver = { 316 .driver = { 317 .name = "dw9807", 318 .pm = &dw9807_pm_ops, 319 .of_match_table = dw9807_of_table, 320 }, 321 .probe_new = dw9807_probe, 322 .remove = dw9807_remove, 323 }; 324 325 module_i2c_driver(dw9807_i2c_driver); 326 327 MODULE_AUTHOR("Chiang, Alan"); 328 MODULE_DESCRIPTION("DW9807 VCM driver"); 329 MODULE_LICENSE("GPL v2"); 330