1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * linux/drivers/mfd/aat2870-core.c 4 * 5 * Copyright (c) 2011, NVIDIA Corporation. 6 * Author: Jin Park <jinyoungp@nvidia.com> 7 */ 8 9 #include <linux/kernel.h> 10 #include <linux/init.h> 11 #include <linux/debugfs.h> 12 #include <linux/slab.h> 13 #include <linux/uaccess.h> 14 #include <linux/i2c.h> 15 #include <linux/delay.h> 16 #include <linux/gpio.h> 17 #include <linux/mfd/core.h> 18 #include <linux/mfd/aat2870.h> 19 #include <linux/regulator/machine.h> 20 21 static struct aat2870_register aat2870_regs[AAT2870_REG_NUM] = { 22 /* readable, writeable, value */ 23 { 0, 1, 0x00 }, /* 0x00 AAT2870_BL_CH_EN */ 24 { 0, 1, 0x16 }, /* 0x01 AAT2870_BLM */ 25 { 0, 1, 0x16 }, /* 0x02 AAT2870_BLS */ 26 { 0, 1, 0x56 }, /* 0x03 AAT2870_BL1 */ 27 { 0, 1, 0x56 }, /* 0x04 AAT2870_BL2 */ 28 { 0, 1, 0x56 }, /* 0x05 AAT2870_BL3 */ 29 { 0, 1, 0x56 }, /* 0x06 AAT2870_BL4 */ 30 { 0, 1, 0x56 }, /* 0x07 AAT2870_BL5 */ 31 { 0, 1, 0x56 }, /* 0x08 AAT2870_BL6 */ 32 { 0, 1, 0x56 }, /* 0x09 AAT2870_BL7 */ 33 { 0, 1, 0x56 }, /* 0x0A AAT2870_BL8 */ 34 { 0, 1, 0x00 }, /* 0x0B AAT2870_FLR */ 35 { 0, 1, 0x03 }, /* 0x0C AAT2870_FM */ 36 { 0, 1, 0x03 }, /* 0x0D AAT2870_FS */ 37 { 0, 1, 0x10 }, /* 0x0E AAT2870_ALS_CFG0 */ 38 { 0, 1, 0x06 }, /* 0x0F AAT2870_ALS_CFG1 */ 39 { 0, 1, 0x00 }, /* 0x10 AAT2870_ALS_CFG2 */ 40 { 1, 0, 0x00 }, /* 0x11 AAT2870_AMB */ 41 { 0, 1, 0x00 }, /* 0x12 AAT2870_ALS0 */ 42 { 0, 1, 0x00 }, /* 0x13 AAT2870_ALS1 */ 43 { 0, 1, 0x00 }, /* 0x14 AAT2870_ALS2 */ 44 { 0, 1, 0x00 }, /* 0x15 AAT2870_ALS3 */ 45 { 0, 1, 0x00 }, /* 0x16 AAT2870_ALS4 */ 46 { 0, 1, 0x00 }, /* 0x17 AAT2870_ALS5 */ 47 { 0, 1, 0x00 }, /* 0x18 AAT2870_ALS6 */ 48 { 0, 1, 0x00 }, /* 0x19 AAT2870_ALS7 */ 49 { 0, 1, 0x00 }, /* 0x1A AAT2870_ALS8 */ 50 { 0, 1, 0x00 }, /* 0x1B AAT2870_ALS9 */ 51 { 0, 1, 0x00 }, /* 0x1C AAT2870_ALSA */ 52 { 0, 1, 0x00 }, /* 0x1D AAT2870_ALSB */ 53 { 0, 1, 0x00 }, /* 0x1E AAT2870_ALSC */ 54 { 0, 1, 0x00 }, /* 0x1F AAT2870_ALSD */ 55 { 0, 1, 0x00 }, /* 0x20 AAT2870_ALSE */ 56 { 0, 1, 0x00 }, /* 0x21 AAT2870_ALSF */ 57 { 0, 1, 0x00 }, /* 0x22 AAT2870_SUB_SET */ 58 { 0, 1, 0x00 }, /* 0x23 AAT2870_SUB_CTRL */ 59 { 0, 1, 0x00 }, /* 0x24 AAT2870_LDO_AB */ 60 { 0, 1, 0x00 }, /* 0x25 AAT2870_LDO_CD */ 61 { 0, 1, 0x00 }, /* 0x26 AAT2870_LDO_EN */ 62 }; 63 64 static struct mfd_cell aat2870_devs[] = { 65 { 66 .name = "aat2870-backlight", 67 .id = AAT2870_ID_BL, 68 .pdata_size = sizeof(struct aat2870_bl_platform_data), 69 }, 70 { 71 .name = "aat2870-regulator", 72 .id = AAT2870_ID_LDOA, 73 .pdata_size = sizeof(struct regulator_init_data), 74 }, 75 { 76 .name = "aat2870-regulator", 77 .id = AAT2870_ID_LDOB, 78 .pdata_size = sizeof(struct regulator_init_data), 79 }, 80 { 81 .name = "aat2870-regulator", 82 .id = AAT2870_ID_LDOC, 83 .pdata_size = sizeof(struct regulator_init_data), 84 }, 85 { 86 .name = "aat2870-regulator", 87 .id = AAT2870_ID_LDOD, 88 .pdata_size = sizeof(struct regulator_init_data), 89 }, 90 }; 91 92 static int __aat2870_read(struct aat2870_data *aat2870, u8 addr, u8 *val) 93 { 94 int ret; 95 96 if (addr >= AAT2870_REG_NUM) { 97 dev_err(aat2870->dev, "Invalid address, 0x%02x\n", addr); 98 return -EINVAL; 99 } 100 101 if (!aat2870->reg_cache[addr].readable) { 102 *val = aat2870->reg_cache[addr].value; 103 goto out; 104 } 105 106 ret = i2c_master_send(aat2870->client, &addr, 1); 107 if (ret < 0) 108 return ret; 109 if (ret != 1) 110 return -EIO; 111 112 ret = i2c_master_recv(aat2870->client, val, 1); 113 if (ret < 0) 114 return ret; 115 if (ret != 1) 116 return -EIO; 117 118 out: 119 dev_dbg(aat2870->dev, "read: addr=0x%02x, val=0x%02x\n", addr, *val); 120 return 0; 121 } 122 123 static int __aat2870_write(struct aat2870_data *aat2870, u8 addr, u8 val) 124 { 125 u8 msg[2]; 126 int ret; 127 128 if (addr >= AAT2870_REG_NUM) { 129 dev_err(aat2870->dev, "Invalid address, 0x%02x\n", addr); 130 return -EINVAL; 131 } 132 133 if (!aat2870->reg_cache[addr].writeable) { 134 dev_err(aat2870->dev, "Address 0x%02x is not writeable\n", 135 addr); 136 return -EINVAL; 137 } 138 139 msg[0] = addr; 140 msg[1] = val; 141 ret = i2c_master_send(aat2870->client, msg, 2); 142 if (ret < 0) 143 return ret; 144 if (ret != 2) 145 return -EIO; 146 147 aat2870->reg_cache[addr].value = val; 148 149 dev_dbg(aat2870->dev, "write: addr=0x%02x, val=0x%02x\n", addr, val); 150 return 0; 151 } 152 153 static int aat2870_read(struct aat2870_data *aat2870, u8 addr, u8 *val) 154 { 155 int ret; 156 157 mutex_lock(&aat2870->io_lock); 158 ret = __aat2870_read(aat2870, addr, val); 159 mutex_unlock(&aat2870->io_lock); 160 161 return ret; 162 } 163 164 static int aat2870_write(struct aat2870_data *aat2870, u8 addr, u8 val) 165 { 166 int ret; 167 168 mutex_lock(&aat2870->io_lock); 169 ret = __aat2870_write(aat2870, addr, val); 170 mutex_unlock(&aat2870->io_lock); 171 172 return ret; 173 } 174 175 static int aat2870_update(struct aat2870_data *aat2870, u8 addr, u8 mask, 176 u8 val) 177 { 178 int change; 179 u8 old_val, new_val; 180 int ret; 181 182 mutex_lock(&aat2870->io_lock); 183 184 ret = __aat2870_read(aat2870, addr, &old_val); 185 if (ret) 186 goto out_unlock; 187 188 new_val = (old_val & ~mask) | (val & mask); 189 change = old_val != new_val; 190 if (change) 191 ret = __aat2870_write(aat2870, addr, new_val); 192 193 out_unlock: 194 mutex_unlock(&aat2870->io_lock); 195 196 return ret; 197 } 198 199 static inline void aat2870_enable(struct aat2870_data *aat2870) 200 { 201 if (aat2870->en_pin >= 0) 202 gpio_set_value(aat2870->en_pin, 1); 203 204 aat2870->is_enable = 1; 205 } 206 207 static inline void aat2870_disable(struct aat2870_data *aat2870) 208 { 209 if (aat2870->en_pin >= 0) 210 gpio_set_value(aat2870->en_pin, 0); 211 212 aat2870->is_enable = 0; 213 } 214 215 #ifdef CONFIG_DEBUG_FS 216 static ssize_t aat2870_dump_reg(struct aat2870_data *aat2870, char *buf) 217 { 218 u8 addr, val; 219 ssize_t count = 0; 220 int ret; 221 222 count += sprintf(buf, "aat2870 registers\n"); 223 for (addr = 0; addr < AAT2870_REG_NUM; addr++) { 224 count += snprintf(buf + count, PAGE_SIZE - count, "0x%02x: ", addr); 225 if (count >= PAGE_SIZE - 1) 226 break; 227 228 ret = aat2870->read(aat2870, addr, &val); 229 if (ret == 0) 230 count += snprintf(buf + count, PAGE_SIZE - count, 231 "0x%02x", val); 232 else 233 count += snprintf(buf + count, PAGE_SIZE - count, 234 "<read fail: %d>", ret); 235 236 if (count >= PAGE_SIZE - 1) 237 break; 238 239 count += snprintf(buf + count, PAGE_SIZE - count, "\n"); 240 if (count >= PAGE_SIZE - 1) 241 break; 242 } 243 244 /* Truncate count; min() would cause a warning */ 245 if (count >= PAGE_SIZE) 246 count = PAGE_SIZE - 1; 247 248 return count; 249 } 250 251 static ssize_t aat2870_reg_read_file(struct file *file, char __user *user_buf, 252 size_t count, loff_t *ppos) 253 { 254 struct aat2870_data *aat2870 = file->private_data; 255 char *buf; 256 ssize_t ret; 257 258 buf = kmalloc(PAGE_SIZE, GFP_KERNEL); 259 if (!buf) 260 return -ENOMEM; 261 262 ret = aat2870_dump_reg(aat2870, buf); 263 if (ret >= 0) 264 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); 265 266 kfree(buf); 267 268 return ret; 269 } 270 271 static ssize_t aat2870_reg_write_file(struct file *file, 272 const char __user *user_buf, size_t count, 273 loff_t *ppos) 274 { 275 struct aat2870_data *aat2870 = file->private_data; 276 char buf[32]; 277 ssize_t buf_size; 278 char *start = buf; 279 unsigned long addr, val; 280 int ret; 281 282 buf_size = min(count, (size_t)(sizeof(buf)-1)); 283 if (copy_from_user(buf, user_buf, buf_size)) { 284 dev_err(aat2870->dev, "Failed to copy from user\n"); 285 return -EFAULT; 286 } 287 buf[buf_size] = 0; 288 289 while (*start == ' ') 290 start++; 291 292 ret = kstrtoul(start, 16, &addr); 293 if (ret) 294 return ret; 295 296 if (addr >= AAT2870_REG_NUM) { 297 dev_err(aat2870->dev, "Invalid address, 0x%lx\n", addr); 298 return -EINVAL; 299 } 300 301 while (*start == ' ') 302 start++; 303 304 ret = kstrtoul(start, 16, &val); 305 if (ret) 306 return ret; 307 308 ret = aat2870->write(aat2870, (u8)addr, (u8)val); 309 if (ret) 310 return ret; 311 312 return buf_size; 313 } 314 315 static const struct file_operations aat2870_reg_fops = { 316 .open = simple_open, 317 .read = aat2870_reg_read_file, 318 .write = aat2870_reg_write_file, 319 }; 320 321 static void aat2870_init_debugfs(struct aat2870_data *aat2870) 322 { 323 aat2870->dentry_root = debugfs_create_dir("aat2870", NULL); 324 325 debugfs_create_file("regs", 0644, aat2870->dentry_root, aat2870, 326 &aat2870_reg_fops); 327 } 328 329 #else 330 static inline void aat2870_init_debugfs(struct aat2870_data *aat2870) 331 { 332 } 333 #endif /* CONFIG_DEBUG_FS */ 334 335 static int aat2870_i2c_probe(struct i2c_client *client) 336 { 337 struct aat2870_platform_data *pdata = dev_get_platdata(&client->dev); 338 struct aat2870_data *aat2870; 339 int i, j; 340 int ret = 0; 341 342 aat2870 = devm_kzalloc(&client->dev, sizeof(struct aat2870_data), 343 GFP_KERNEL); 344 if (!aat2870) 345 return -ENOMEM; 346 347 aat2870->dev = &client->dev; 348 aat2870->client = client; 349 i2c_set_clientdata(client, aat2870); 350 351 aat2870->reg_cache = aat2870_regs; 352 353 if (pdata->en_pin < 0) 354 aat2870->en_pin = -1; 355 else 356 aat2870->en_pin = pdata->en_pin; 357 358 aat2870->init = pdata->init; 359 aat2870->uninit = pdata->uninit; 360 aat2870->read = aat2870_read; 361 aat2870->write = aat2870_write; 362 aat2870->update = aat2870_update; 363 364 mutex_init(&aat2870->io_lock); 365 366 if (aat2870->init) 367 aat2870->init(aat2870); 368 369 if (aat2870->en_pin >= 0) { 370 ret = devm_gpio_request_one(&client->dev, aat2870->en_pin, 371 GPIOF_OUT_INIT_HIGH, "aat2870-en"); 372 if (ret < 0) { 373 dev_err(&client->dev, 374 "Failed to request GPIO %d\n", aat2870->en_pin); 375 return ret; 376 } 377 } 378 379 aat2870_enable(aat2870); 380 381 for (i = 0; i < pdata->num_subdevs; i++) { 382 for (j = 0; j < ARRAY_SIZE(aat2870_devs); j++) { 383 if ((pdata->subdevs[i].id == aat2870_devs[j].id) && 384 !strcmp(pdata->subdevs[i].name, 385 aat2870_devs[j].name)) { 386 aat2870_devs[j].platform_data = 387 pdata->subdevs[i].platform_data; 388 break; 389 } 390 } 391 } 392 393 ret = mfd_add_devices(aat2870->dev, 0, aat2870_devs, 394 ARRAY_SIZE(aat2870_devs), NULL, 0, NULL); 395 if (ret != 0) { 396 dev_err(aat2870->dev, "Failed to add subdev: %d\n", ret); 397 goto out_disable; 398 } 399 400 aat2870_init_debugfs(aat2870); 401 402 return 0; 403 404 out_disable: 405 aat2870_disable(aat2870); 406 return ret; 407 } 408 409 static int aat2870_i2c_suspend(struct device *dev) 410 { 411 struct i2c_client *client = to_i2c_client(dev); 412 struct aat2870_data *aat2870 = i2c_get_clientdata(client); 413 414 aat2870_disable(aat2870); 415 416 return 0; 417 } 418 419 static int aat2870_i2c_resume(struct device *dev) 420 { 421 struct i2c_client *client = to_i2c_client(dev); 422 struct aat2870_data *aat2870 = i2c_get_clientdata(client); 423 struct aat2870_register *reg = NULL; 424 int i; 425 426 aat2870_enable(aat2870); 427 428 /* restore registers */ 429 for (i = 0; i < AAT2870_REG_NUM; i++) { 430 reg = &aat2870->reg_cache[i]; 431 if (reg->writeable) 432 aat2870->write(aat2870, i, reg->value); 433 } 434 435 return 0; 436 } 437 438 static DEFINE_SIMPLE_DEV_PM_OPS(aat2870_pm_ops, aat2870_i2c_suspend, 439 aat2870_i2c_resume); 440 441 static const struct i2c_device_id aat2870_i2c_id_table[] = { 442 { "aat2870" }, 443 { } 444 }; 445 446 static struct i2c_driver aat2870_i2c_driver = { 447 .driver = { 448 .name = "aat2870", 449 .pm = pm_sleep_ptr(&aat2870_pm_ops), 450 .suppress_bind_attrs = true, 451 }, 452 .probe = aat2870_i2c_probe, 453 .id_table = aat2870_i2c_id_table, 454 }; 455 456 static int __init aat2870_init(void) 457 { 458 return i2c_add_driver(&aat2870_i2c_driver); 459 } 460 subsys_initcall(aat2870_init); 461