1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * Driver for the s5k83a sensor 4 * 5 * Copyright (C) 2008 Erik Andrén 6 * Copyright (C) 2007 Ilyes Gouta. Based on the m5603x Linux Driver Project. 7 * Copyright (C) 2005 m5603x Linux Driver Project <m5602@x3ng.com.br> 8 * 9 * Portions of code to USB interface and ALi driver software, 10 * Copyright (c) 2006 Willem Duinker 11 * v4l2 interface modeled after the V4L2 driver 12 * for SN9C10x PC Camera Controllers 13 */ 14 15#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 16 17#include <linux/kthread.h> 18#include "m5602_s5k83a.h" 19 20static int s5k83a_s_ctrl(struct v4l2_ctrl *ctrl); 21 22static const struct v4l2_ctrl_ops s5k83a_ctrl_ops = { 23 .s_ctrl = s5k83a_s_ctrl, 24}; 25 26static struct v4l2_pix_format s5k83a_modes[] = { 27 { 28 640, 29 480, 30 V4L2_PIX_FMT_SBGGR8, 31 V4L2_FIELD_NONE, 32 .sizeimage = 33 640 * 480, 34 .bytesperline = 640, 35 .colorspace = V4L2_COLORSPACE_SRGB, 36 .priv = 0 37 } 38}; 39 40static const unsigned char preinit_s5k83a[][4] = { 41 {BRIDGE, M5602_XB_MCU_CLK_DIV, 0x02, 0x00}, 42 {BRIDGE, M5602_XB_MCU_CLK_CTRL, 0xb0, 0x00}, 43 {BRIDGE, M5602_XB_SEN_CLK_DIV, 0x00, 0x00}, 44 {BRIDGE, M5602_XB_SEN_CLK_CTRL, 0xb0, 0x00}, 45 {BRIDGE, M5602_XB_ADC_CTRL, 0xc0, 0x00}, 46 {BRIDGE, M5602_XB_SENSOR_TYPE, 0x0d, 0x00}, 47 {BRIDGE, M5602_XB_SENSOR_CTRL, 0x00, 0x00}, 48 49 {BRIDGE, M5602_XB_SIG_INI, 0x00, 0x00}, 50 {BRIDGE, M5602_XB_GPIO_DIR, 0x1d, 0x00}, 51 {BRIDGE, M5602_XB_GPIO_DAT, 0x08, 0x00}, 52 {BRIDGE, M5602_XB_GPIO_EN_H, 0x3f, 0x00}, 53 {BRIDGE, M5602_XB_GPIO_DIR_H, 0x3f, 0x00}, 54 {BRIDGE, M5602_XB_GPIO_DAT_H, 0x00, 0x00}, 55 {BRIDGE, M5602_XB_GPIO_EN_L, 0xff, 0x00}, 56 {BRIDGE, M5602_XB_GPIO_DIR_L, 0xff, 0x00}, 57 {BRIDGE, M5602_XB_GPIO_DAT_L, 0x00, 0x00}, 58 {BRIDGE, M5602_XB_SEN_CLK_DIV, 0xb0, 0x00}, 59 {BRIDGE, M5602_XB_SEN_CLK_CTRL, 0x80, 0x00}, 60 {BRIDGE, M5602_XB_SEN_CLK_DIV, 0x00, 0x00}, 61 {BRIDGE, M5602_XB_SEN_CLK_CTRL, 0xb0, 0x00}, 62 {BRIDGE, M5602_XB_ADC_CTRL, 0xc0, 0x00}, 63 {BRIDGE, M5602_XB_SENSOR_TYPE, 0x09, 0x00}, 64 {BRIDGE, M5602_XB_MCU_CLK_DIV, 0x02, 0x00}, 65 {BRIDGE, M5602_XB_MCU_CLK_CTRL, 0xb0, 0x00}, 66 {BRIDGE, M5602_XB_SEN_CLK_DIV, 0x00, 0x00}, 67 {BRIDGE, M5602_XB_SEN_CLK_CTRL, 0xf0, 0x00}, 68 {BRIDGE, M5602_XB_GPIO_DIR, 0x1d, 0x00}, 69 {BRIDGE, M5602_XB_GPIO_DAT, 0x1c, 0x00}, 70 {BRIDGE, M5602_XB_GPIO_EN_H, 0x06, 0x00}, 71 {BRIDGE, M5602_XB_GPIO_DIR_H, 0x06, 0x00}, 72 {BRIDGE, M5602_XB_GPIO_DAT_H, 0x00, 0x00}, 73 {BRIDGE, M5602_XB_GPIO_EN_L, 0x00, 0x00}, 74 {BRIDGE, M5602_XB_I2C_CLK_DIV, 0x20, 0x00}, 75}; 76 77/* This could probably be considerably shortened. 78 I don't have the hardware to experiment with it, patches welcome 79*/ 80static const unsigned char init_s5k83a[][4] = { 81 /* The following sequence is useless after a clean boot 82 but is necessary after resume from suspend */ 83 {BRIDGE, M5602_XB_GPIO_DIR, 0x1d, 0x00}, 84 {BRIDGE, M5602_XB_GPIO_DAT, 0x08, 0x00}, 85 {BRIDGE, M5602_XB_GPIO_EN_H, 0x3f, 0x00}, 86 {BRIDGE, M5602_XB_GPIO_DIR_H, 0x3f, 0x00}, 87 {BRIDGE, M5602_XB_GPIO_DAT_H, 0x00, 0x00}, 88 {BRIDGE, M5602_XB_GPIO_EN_L, 0xff, 0x00}, 89 {BRIDGE, M5602_XB_GPIO_DIR_L, 0xff, 0x00}, 90 {BRIDGE, M5602_XB_GPIO_DAT_L, 0x00, 0x00}, 91 {BRIDGE, M5602_XB_SEN_CLK_DIV, 0xb0, 0x00}, 92 {BRIDGE, M5602_XB_SEN_CLK_CTRL, 0x80, 0x00}, 93 {BRIDGE, M5602_XB_SEN_CLK_DIV, 0x00, 0x00}, 94 {BRIDGE, M5602_XB_SEN_CLK_CTRL, 0xb0, 0x00}, 95 {BRIDGE, M5602_XB_ADC_CTRL, 0xc0, 0x00}, 96 {BRIDGE, M5602_XB_SENSOR_TYPE, 0x09, 0x00}, 97 {BRIDGE, M5602_XB_MCU_CLK_DIV, 0x02, 0x00}, 98 {BRIDGE, M5602_XB_MCU_CLK_CTRL, 0xb0, 0x00}, 99 {BRIDGE, M5602_XB_SEN_CLK_DIV, 0x00, 0x00}, 100 {BRIDGE, M5602_XB_SEN_CLK_CTRL, 0xf0, 0x00}, 101 {BRIDGE, M5602_XB_GPIO_DIR, 0x1d, 0x00}, 102 {BRIDGE, M5602_XB_GPIO_DAT, 0x08, 0x00}, 103 {BRIDGE, M5602_XB_GPIO_EN_H, 0x06, 0x00}, 104 {BRIDGE, M5602_XB_GPIO_DIR_H, 0x06, 0x00}, 105 {BRIDGE, M5602_XB_GPIO_DAT_H, 0x00, 0x00}, 106 {BRIDGE, M5602_XB_GPIO_EN_L, 0x00, 0x00}, 107 {BRIDGE, M5602_XB_I2C_CLK_DIV, 0x20, 0x00}, 108 109 {SENSOR, S5K83A_PAGE_MAP, 0x04, 0x00}, 110 {SENSOR, 0xaf, 0x01, 0x00}, 111 {SENSOR, S5K83A_PAGE_MAP, 0x00, 0x00}, 112 {SENSOR, 0x7b, 0xff, 0x00}, 113 {SENSOR, S5K83A_PAGE_MAP, 0x05, 0x00}, 114 {SENSOR, 0x01, 0x50, 0x00}, 115 {SENSOR, 0x12, 0x20, 0x00}, 116 {SENSOR, 0x17, 0x40, 0x00}, 117 {SENSOR, 0x1c, 0x00, 0x00}, 118 {SENSOR, 0x02, 0x70, 0x00}, 119 {SENSOR, 0x03, 0x0b, 0x00}, 120 {SENSOR, 0x04, 0xf0, 0x00}, 121 {SENSOR, 0x05, 0x0b, 0x00}, 122 {SENSOR, 0x06, 0x71, 0x00}, 123 {SENSOR, 0x07, 0xe8, 0x00}, /* 488 */ 124 {SENSOR, 0x08, 0x02, 0x00}, 125 {SENSOR, 0x09, 0x88, 0x00}, /* 648 */ 126 {SENSOR, 0x14, 0x00, 0x00}, 127 {SENSOR, 0x15, 0x20, 0x00}, /* 32 */ 128 {SENSOR, 0x19, 0x00, 0x00}, 129 {SENSOR, 0x1a, 0x98, 0x00}, /* 152 */ 130 {SENSOR, 0x0f, 0x02, 0x00}, 131 {SENSOR, 0x10, 0xe5, 0x00}, /* 741 */ 132 /* normal colors 133 (this is value after boot, but after tries can be different) */ 134 {SENSOR, 0x00, 0x06, 0x00}, 135}; 136 137static const unsigned char start_s5k83a[][4] = { 138 {BRIDGE, M5602_XB_SEN_CLK_DIV, 0x06, 0x00}, 139 {BRIDGE, M5602_XB_SEN_CLK_CTRL, 0xb0, 0x00}, 140 {BRIDGE, M5602_XB_ADC_CTRL, 0xc0, 0x00}, 141 {BRIDGE, M5602_XB_SENSOR_TYPE, 0x09, 0x00}, 142 {BRIDGE, M5602_XB_LINE_OF_FRAME_H, 0x81, 0x00}, 143 {BRIDGE, M5602_XB_PIX_OF_LINE_H, 0x82, 0x00}, 144 {BRIDGE, M5602_XB_SIG_INI, 0x01, 0x00}, 145 {BRIDGE, M5602_XB_VSYNC_PARA, 0x00, 0x00}, 146 {BRIDGE, M5602_XB_VSYNC_PARA, 0x00, 0x00}, 147 {BRIDGE, M5602_XB_VSYNC_PARA, 0x00, 0x00}, 148 {BRIDGE, M5602_XB_VSYNC_PARA, 0x00, 0x00}, 149 {BRIDGE, M5602_XB_VSYNC_PARA, 0x01, 0x00}, 150 {BRIDGE, M5602_XB_VSYNC_PARA, 0xe4, 0x00}, /* 484 */ 151 {BRIDGE, M5602_XB_VSYNC_PARA, 0x00, 0x00}, 152 {BRIDGE, M5602_XB_VSYNC_PARA, 0x00, 0x00}, 153 {BRIDGE, M5602_XB_SIG_INI, 0x00, 0x00}, 154 {BRIDGE, M5602_XB_SIG_INI, 0x02, 0x00}, 155 {BRIDGE, M5602_XB_HSYNC_PARA, 0x00, 0x00}, 156 {BRIDGE, M5602_XB_HSYNC_PARA, 0x00, 0x00}, 157 {BRIDGE, M5602_XB_HSYNC_PARA, 0x02, 0x00}, 158 {BRIDGE, M5602_XB_HSYNC_PARA, 0x7f, 0x00}, /* 639 */ 159 {BRIDGE, M5602_XB_SIG_INI, 0x00, 0x00}, 160 {BRIDGE, M5602_XB_SEN_CLK_DIV, 0x00, 0x00}, 161 {BRIDGE, M5602_XB_SEN_CLK_CTRL, 0xb0, 0x00}, 162}; 163 164static void s5k83a_dump_registers(struct sd *sd); 165static int s5k83a_get_rotation(struct sd *sd, u8 *reg_data); 166static int s5k83a_set_led_indication(struct sd *sd, u8 val); 167static int s5k83a_set_flip_real(struct gspca_dev *gspca_dev, 168 __s32 vflip, __s32 hflip); 169 170int s5k83a_probe(struct sd *sd) 171{ 172 u8 prod_id = 0, ver_id = 0; 173 int i, err = 0; 174 struct gspca_dev *gspca_dev = (struct gspca_dev *)sd; 175 176 if (force_sensor) { 177 if (force_sensor == S5K83A_SENSOR) { 178 pr_info("Forcing a %s sensor\n", s5k83a.name); 179 goto sensor_found; 180 } 181 /* If we want to force another sensor, don't try to probe this 182 * one */ 183 return -ENODEV; 184 } 185 186 gspca_dbg(gspca_dev, D_PROBE, "Probing for a s5k83a sensor\n"); 187 188 /* Preinit the sensor */ 189 for (i = 0; i < ARRAY_SIZE(preinit_s5k83a) && !err; i++) { 190 u8 data[2] = {preinit_s5k83a[i][2], preinit_s5k83a[i][3]}; 191 if (preinit_s5k83a[i][0] == SENSOR) 192 err = m5602_write_sensor(sd, preinit_s5k83a[i][1], 193 data, 2); 194 else 195 err = m5602_write_bridge(sd, preinit_s5k83a[i][1], 196 data[0]); 197 } 198 199 /* We don't know what register (if any) that contain the product id 200 * Just pick the first addresses that seem to produce the same results 201 * on multiple machines */ 202 if (m5602_read_sensor(sd, 0x00, &prod_id, 1)) 203 return -ENODEV; 204 205 if (m5602_read_sensor(sd, 0x01, &ver_id, 1)) 206 return -ENODEV; 207 208 if ((prod_id == 0xff) || (ver_id == 0xff)) 209 return -ENODEV; 210 else 211 pr_info("Detected a s5k83a sensor\n"); 212 213sensor_found: 214 sd->gspca_dev.cam.cam_mode = s5k83a_modes; 215 sd->gspca_dev.cam.nmodes = ARRAY_SIZE(s5k83a_modes); 216 217 /* null the pointer! thread is't running now */ 218 sd->rotation_thread = NULL; 219 220 return 0; 221} 222 223int s5k83a_init(struct sd *sd) 224{ 225 int i, err = 0; 226 227 for (i = 0; i < ARRAY_SIZE(init_s5k83a) && !err; i++) { 228 u8 data[2] = {0x00, 0x00}; 229 230 switch (init_s5k83a[i][0]) { 231 case BRIDGE: 232 err = m5602_write_bridge(sd, 233 init_s5k83a[i][1], 234 init_s5k83a[i][2]); 235 break; 236 237 case SENSOR: 238 data[0] = init_s5k83a[i][2]; 239 err = m5602_write_sensor(sd, 240 init_s5k83a[i][1], data, 1); 241 break; 242 243 case SENSOR_LONG: 244 data[0] = init_s5k83a[i][2]; 245 data[1] = init_s5k83a[i][3]; 246 err = m5602_write_sensor(sd, 247 init_s5k83a[i][1], data, 2); 248 break; 249 default: 250 pr_info("Invalid stream command, exiting init\n"); 251 return -EINVAL; 252 } 253 } 254 255 if (dump_sensor) 256 s5k83a_dump_registers(sd); 257 258 return err; 259} 260 261int s5k83a_init_controls(struct sd *sd) 262{ 263 struct v4l2_ctrl_handler *hdl = &sd->gspca_dev.ctrl_handler; 264 265 sd->gspca_dev.vdev.ctrl_handler = hdl; 266 v4l2_ctrl_handler_init(hdl, 6); 267 268 v4l2_ctrl_new_std(hdl, &s5k83a_ctrl_ops, V4L2_CID_BRIGHTNESS, 269 0, 255, 1, S5K83A_DEFAULT_BRIGHTNESS); 270 271 v4l2_ctrl_new_std(hdl, &s5k83a_ctrl_ops, V4L2_CID_EXPOSURE, 272 0, S5K83A_MAXIMUM_EXPOSURE, 1, 273 S5K83A_DEFAULT_EXPOSURE); 274 275 v4l2_ctrl_new_std(hdl, &s5k83a_ctrl_ops, V4L2_CID_GAIN, 276 0, 255, 1, S5K83A_DEFAULT_GAIN); 277 278 sd->hflip = v4l2_ctrl_new_std(hdl, &s5k83a_ctrl_ops, V4L2_CID_HFLIP, 279 0, 1, 1, 0); 280 sd->vflip = v4l2_ctrl_new_std(hdl, &s5k83a_ctrl_ops, V4L2_CID_VFLIP, 281 0, 1, 1, 0); 282 283 if (hdl->error) { 284 pr_err("Could not initialize controls\n"); 285 return hdl->error; 286 } 287 288 v4l2_ctrl_cluster(2, &sd->hflip); 289 290 return 0; 291} 292 293static int rotation_thread_function(void *data) 294{ 295 struct sd *sd = (struct sd *) data; 296 u8 reg, previous_rotation = 0; 297 __s32 vflip, hflip; 298 299 set_current_state(TASK_INTERRUPTIBLE); 300 while (!schedule_timeout(msecs_to_jiffies(100))) { 301 if (mutex_lock_interruptible(&sd->gspca_dev.usb_lock)) 302 break; 303 304 s5k83a_get_rotation(sd, ®); 305 if (previous_rotation != reg) { 306 previous_rotation = reg; 307 pr_info("Camera was flipped\n"); 308 309 hflip = sd->hflip->val; 310 vflip = sd->vflip->val; 311 312 if (reg) { 313 vflip = !vflip; 314 hflip = !hflip; 315 } 316 s5k83a_set_flip_real((struct gspca_dev *) sd, 317 vflip, hflip); 318 } 319 320 mutex_unlock(&sd->gspca_dev.usb_lock); 321 set_current_state(TASK_INTERRUPTIBLE); 322 } 323 324 /* return to "front" flip */ 325 if (previous_rotation) { 326 hflip = sd->hflip->val; 327 vflip = sd->vflip->val; 328 s5k83a_set_flip_real((struct gspca_dev *) sd, vflip, hflip); 329 } 330 331 sd->rotation_thread = NULL; 332 return 0; 333} 334 335int s5k83a_start(struct sd *sd) 336{ 337 int i, err = 0; 338 339 /* Create another thread, polling the GPIO ports of the camera to check 340 if it got rotated. This is how the windows driver does it so we have 341 to assume that there is no better way of accomplishing this */ 342 sd->rotation_thread = kthread_create(rotation_thread_function, 343 sd, "rotation thread"); 344 if (IS_ERR(sd->rotation_thread)) { 345 err = PTR_ERR(sd->rotation_thread); 346 sd->rotation_thread = NULL; 347 return err; 348 } 349 wake_up_process(sd->rotation_thread); 350 351 /* Preinit the sensor */ 352 for (i = 0; i < ARRAY_SIZE(start_s5k83a) && !err; i++) { 353 u8 data[2] = {start_s5k83a[i][2], start_s5k83a[i][3]}; 354 if (start_s5k83a[i][0] == SENSOR) 355 err = m5602_write_sensor(sd, start_s5k83a[i][1], 356 data, 2); 357 else 358 err = m5602_write_bridge(sd, start_s5k83a[i][1], 359 data[0]); 360 } 361 if (err < 0) 362 return err; 363 364 return s5k83a_set_led_indication(sd, 1); 365} 366 367int s5k83a_stop(struct sd *sd) 368{ 369 if (sd->rotation_thread) 370 kthread_stop(sd->rotation_thread); 371 372 return s5k83a_set_led_indication(sd, 0); 373} 374 375void s5k83a_disconnect(struct sd *sd) 376{ 377 s5k83a_stop(sd); 378 379 sd->sensor = NULL; 380} 381 382static int s5k83a_set_gain(struct gspca_dev *gspca_dev, __s32 val) 383{ 384 int err; 385 u8 data[2]; 386 struct sd *sd = (struct sd *) gspca_dev; 387 388 data[0] = 0x00; 389 data[1] = 0x20; 390 err = m5602_write_sensor(sd, 0x14, data, 2); 391 if (err < 0) 392 return err; 393 394 data[0] = 0x01; 395 data[1] = 0x00; 396 err = m5602_write_sensor(sd, 0x0d, data, 2); 397 if (err < 0) 398 return err; 399 400 /* FIXME: This is not sane, we need to figure out the composition 401 of these registers */ 402 data[0] = val >> 3; /* gain, high 5 bits */ 403 data[1] = val >> 1; /* gain, high 7 bits */ 404 err = m5602_write_sensor(sd, S5K83A_GAIN, data, 2); 405 406 return err; 407} 408 409static int s5k83a_set_brightness(struct gspca_dev *gspca_dev, __s32 val) 410{ 411 int err; 412 u8 data[1]; 413 struct sd *sd = (struct sd *) gspca_dev; 414 415 data[0] = val; 416 err = m5602_write_sensor(sd, S5K83A_BRIGHTNESS, data, 1); 417 return err; 418} 419 420static int s5k83a_set_exposure(struct gspca_dev *gspca_dev, __s32 val) 421{ 422 int err; 423 u8 data[2]; 424 struct sd *sd = (struct sd *) gspca_dev; 425 426 data[0] = 0; 427 data[1] = val; 428 err = m5602_write_sensor(sd, S5K83A_EXPOSURE, data, 2); 429 return err; 430} 431 432static int s5k83a_set_flip_real(struct gspca_dev *gspca_dev, 433 __s32 vflip, __s32 hflip) 434{ 435 int err; 436 u8 data[1]; 437 struct sd *sd = (struct sd *) gspca_dev; 438 439 data[0] = 0x05; 440 err = m5602_write_sensor(sd, S5K83A_PAGE_MAP, data, 1); 441 if (err < 0) 442 return err; 443 444 /* six bit is vflip, seven is hflip */ 445 data[0] = S5K83A_FLIP_MASK; 446 data[0] = (vflip) ? data[0] | 0x40 : data[0]; 447 data[0] = (hflip) ? data[0] | 0x80 : data[0]; 448 449 err = m5602_write_sensor(sd, S5K83A_FLIP, data, 1); 450 if (err < 0) 451 return err; 452 453 data[0] = (vflip) ? 0x0b : 0x0a; 454 err = m5602_write_sensor(sd, S5K83A_VFLIP_TUNE, data, 1); 455 if (err < 0) 456 return err; 457 458 data[0] = (hflip) ? 0x0a : 0x0b; 459 err = m5602_write_sensor(sd, S5K83A_HFLIP_TUNE, data, 1); 460 return err; 461} 462 463static int s5k83a_set_hvflip(struct gspca_dev *gspca_dev) 464{ 465 int err; 466 u8 reg; 467 struct sd *sd = (struct sd *) gspca_dev; 468 int hflip = sd->hflip->val; 469 int vflip = sd->vflip->val; 470 471 err = s5k83a_get_rotation(sd, ®); 472 if (err < 0) 473 return err; 474 if (reg) { 475 hflip = !hflip; 476 vflip = !vflip; 477 } 478 479 err = s5k83a_set_flip_real(gspca_dev, vflip, hflip); 480 return err; 481} 482 483static int s5k83a_s_ctrl(struct v4l2_ctrl *ctrl) 484{ 485 struct gspca_dev *gspca_dev = 486 container_of(ctrl->handler, struct gspca_dev, ctrl_handler); 487 int err; 488 489 if (!gspca_dev->streaming) 490 return 0; 491 492 switch (ctrl->id) { 493 case V4L2_CID_BRIGHTNESS: 494 err = s5k83a_set_brightness(gspca_dev, ctrl->val); 495 break; 496 case V4L2_CID_EXPOSURE: 497 err = s5k83a_set_exposure(gspca_dev, ctrl->val); 498 break; 499 case V4L2_CID_GAIN: 500 err = s5k83a_set_gain(gspca_dev, ctrl->val); 501 break; 502 case V4L2_CID_HFLIP: 503 err = s5k83a_set_hvflip(gspca_dev); 504 break; 505 default: 506 return -EINVAL; 507 } 508 509 return err; 510} 511 512static int s5k83a_set_led_indication(struct sd *sd, u8 val) 513{ 514 int err = 0; 515 u8 data[1]; 516 517 err = m5602_read_bridge(sd, M5602_XB_GPIO_DAT, data); 518 if (err < 0) 519 return err; 520 521 if (val) 522 data[0] = data[0] | S5K83A_GPIO_LED_MASK; 523 else 524 data[0] = data[0] & ~S5K83A_GPIO_LED_MASK; 525 526 err = m5602_write_bridge(sd, M5602_XB_GPIO_DAT, data[0]); 527 528 return err; 529} 530 531/* Get camera rotation on Acer notebooks */ 532static int s5k83a_get_rotation(struct sd *sd, u8 *reg_data) 533{ 534 int err = m5602_read_bridge(sd, M5602_XB_GPIO_DAT, reg_data); 535 *reg_data = (*reg_data & S5K83A_GPIO_ROTATION_MASK) ? 0 : 1; 536 return err; 537} 538 539static void s5k83a_dump_registers(struct sd *sd) 540{ 541 int address; 542 u8 page, old_page; 543 m5602_read_sensor(sd, S5K83A_PAGE_MAP, &old_page, 1); 544 545 for (page = 0; page < 16; page++) { 546 m5602_write_sensor(sd, S5K83A_PAGE_MAP, &page, 1); 547 pr_info("Dumping the s5k83a register state for page 0x%x\n", 548 page); 549 for (address = 0; address <= 0xff; address++) { 550 u8 val = 0; 551 m5602_read_sensor(sd, address, &val, 1); 552 pr_info("register 0x%x contains 0x%x\n", address, val); 553 } 554 } 555 pr_info("s5k83a register state dump complete\n"); 556 557 for (page = 0; page < 16; page++) { 558 m5602_write_sensor(sd, S5K83A_PAGE_MAP, &page, 1); 559 pr_info("Probing for which registers that are read/write for page 0x%x\n", 560 page); 561 for (address = 0; address <= 0xff; address++) { 562 u8 old_val, ctrl_val, test_val = 0xff; 563 564 m5602_read_sensor(sd, address, &old_val, 1); 565 m5602_write_sensor(sd, address, &test_val, 1); 566 m5602_read_sensor(sd, address, &ctrl_val, 1); 567 568 if (ctrl_val == test_val) 569 pr_info("register 0x%x is writeable\n", 570 address); 571 else 572 pr_info("register 0x%x is read only\n", 573 address); 574 575 /* Restore original val */ 576 m5602_write_sensor(sd, address, &old_val, 1); 577 } 578 } 579 pr_info("Read/write register probing complete\n"); 580 m5602_write_sensor(sd, S5K83A_PAGE_MAP, &old_page, 1); 581} 582