Linus Walleij | 14fa569 | 2009-05-21 23:17:06 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2007-2009 ST-Ericsson |
| 3 | * License terms: GNU General Public License (GPL) version 2 |
| 4 | * Low-level core for exclusive access to the AB3100 IC on the I2C bus |
| 5 | * and some basic chip-configuration. |
| 6 | * Author: Linus Walleij <linus.walleij@stericsson.com> |
| 7 | */ |
| 8 | |
| 9 | #include <linux/i2c.h> |
| 10 | #include <linux/mutex.h> |
| 11 | #include <linux/list.h> |
| 12 | #include <linux/notifier.h> |
| 13 | #include <linux/err.h> |
| 14 | #include <linux/platform_device.h> |
| 15 | #include <linux/device.h> |
| 16 | #include <linux/interrupt.h> |
Linus Walleij | 14fa569 | 2009-05-21 23:17:06 +0200 | [diff] [blame] | 17 | #include <linux/debugfs.h> |
| 18 | #include <linux/seq_file.h> |
| 19 | #include <linux/uaccess.h> |
| 20 | #include <linux/mfd/ab3100.h> |
| 21 | |
| 22 | /* These are the only registers inside AB3100 used in this main file */ |
| 23 | |
| 24 | /* Interrupt event registers */ |
| 25 | #define AB3100_EVENTA1 0x21 |
| 26 | #define AB3100_EVENTA2 0x22 |
| 27 | #define AB3100_EVENTA3 0x23 |
| 28 | |
| 29 | /* AB3100 DAC converter registers */ |
| 30 | #define AB3100_DIS 0x00 |
| 31 | #define AB3100_D0C 0x01 |
| 32 | #define AB3100_D1C 0x02 |
| 33 | #define AB3100_D2C 0x03 |
| 34 | #define AB3100_D3C 0x04 |
| 35 | |
| 36 | /* Chip ID register */ |
| 37 | #define AB3100_CID 0x20 |
| 38 | |
| 39 | /* AB3100 interrupt registers */ |
| 40 | #define AB3100_IMRA1 0x24 |
| 41 | #define AB3100_IMRA2 0x25 |
| 42 | #define AB3100_IMRA3 0x26 |
| 43 | #define AB3100_IMRB1 0x2B |
| 44 | #define AB3100_IMRB2 0x2C |
| 45 | #define AB3100_IMRB3 0x2D |
| 46 | |
| 47 | /* System Power Monitoring and control registers */ |
| 48 | #define AB3100_MCA 0x2E |
| 49 | #define AB3100_MCB 0x2F |
| 50 | |
| 51 | /* SIM power up */ |
| 52 | #define AB3100_SUP 0x50 |
| 53 | |
| 54 | /* |
| 55 | * I2C communication |
| 56 | * |
| 57 | * The AB3100 is usually assigned address 0x48 (7-bit) |
| 58 | * The chip is defined in the platform i2c_board_data section. |
| 59 | */ |
| 60 | static unsigned short normal_i2c[] = { 0x48, I2C_CLIENT_END }; |
| 61 | I2C_CLIENT_INSMOD_1(ab3100); |
| 62 | |
| 63 | u8 ab3100_get_chip_type(struct ab3100 *ab3100) |
| 64 | { |
| 65 | u8 chip = ABUNKNOWN; |
| 66 | |
| 67 | switch (ab3100->chip_id & 0xf0) { |
| 68 | case 0xa0: |
| 69 | chip = AB3000; |
| 70 | break; |
| 71 | case 0xc0: |
| 72 | chip = AB3100; |
| 73 | break; |
| 74 | } |
| 75 | return chip; |
| 76 | } |
| 77 | EXPORT_SYMBOL(ab3100_get_chip_type); |
| 78 | |
Linus Walleij | 956f25a | 2009-08-13 11:49:23 +0200 | [diff] [blame] | 79 | int ab3100_set_register_interruptible(struct ab3100 *ab3100, u8 reg, u8 regval) |
Linus Walleij | 14fa569 | 2009-05-21 23:17:06 +0200 | [diff] [blame] | 80 | { |
| 81 | u8 regandval[2] = {reg, regval}; |
| 82 | int err; |
| 83 | |
| 84 | err = mutex_lock_interruptible(&ab3100->access_mutex); |
| 85 | if (err) |
| 86 | return err; |
| 87 | |
| 88 | /* |
| 89 | * A two-byte write message with the first byte containing the register |
| 90 | * number and the second byte containing the value to be written |
| 91 | * effectively sets a register in the AB3100. |
| 92 | */ |
| 93 | err = i2c_master_send(ab3100->i2c_client, regandval, 2); |
| 94 | if (err < 0) { |
| 95 | dev_err(ab3100->dev, |
| 96 | "write error (write register): %d\n", |
| 97 | err); |
| 98 | } else if (err != 2) { |
| 99 | dev_err(ab3100->dev, |
| 100 | "write error (write register) " |
| 101 | "%d bytes transferred (expected 2)\n", |
| 102 | err); |
| 103 | err = -EIO; |
| 104 | } else { |
| 105 | /* All is well */ |
| 106 | err = 0; |
| 107 | } |
| 108 | mutex_unlock(&ab3100->access_mutex); |
Linus Walleij | 7cdc2b9 | 2009-08-13 11:49:38 +0200 | [diff] [blame] | 109 | return err; |
Linus Walleij | 14fa569 | 2009-05-21 23:17:06 +0200 | [diff] [blame] | 110 | } |
Linus Walleij | 956f25a | 2009-08-13 11:49:23 +0200 | [diff] [blame] | 111 | EXPORT_SYMBOL(ab3100_set_register_interruptible); |
| 112 | |
Linus Walleij | 14fa569 | 2009-05-21 23:17:06 +0200 | [diff] [blame] | 113 | |
| 114 | /* |
| 115 | * The test registers exist at an I2C bus address up one |
| 116 | * from the ordinary base. They are not supposed to be used |
| 117 | * in production code, but sometimes you have to do that |
| 118 | * anyway. It's currently only used from this file so declare |
| 119 | * it static and do not export. |
| 120 | */ |
Linus Walleij | 956f25a | 2009-08-13 11:49:23 +0200 | [diff] [blame] | 121 | static int ab3100_set_test_register_interruptible(struct ab3100 *ab3100, |
Linus Walleij | 14fa569 | 2009-05-21 23:17:06 +0200 | [diff] [blame] | 122 | u8 reg, u8 regval) |
| 123 | { |
| 124 | u8 regandval[2] = {reg, regval}; |
| 125 | int err; |
| 126 | |
| 127 | err = mutex_lock_interruptible(&ab3100->access_mutex); |
| 128 | if (err) |
| 129 | return err; |
| 130 | |
| 131 | err = i2c_master_send(ab3100->testreg_client, regandval, 2); |
| 132 | if (err < 0) { |
| 133 | dev_err(ab3100->dev, |
| 134 | "write error (write test register): %d\n", |
| 135 | err); |
| 136 | } else if (err != 2) { |
| 137 | dev_err(ab3100->dev, |
| 138 | "write error (write test register) " |
| 139 | "%d bytes transferred (expected 2)\n", |
| 140 | err); |
| 141 | err = -EIO; |
| 142 | } else { |
| 143 | /* All is well */ |
| 144 | err = 0; |
| 145 | } |
| 146 | mutex_unlock(&ab3100->access_mutex); |
| 147 | |
| 148 | return err; |
| 149 | } |
| 150 | |
Linus Walleij | 956f25a | 2009-08-13 11:49:23 +0200 | [diff] [blame] | 151 | |
| 152 | int ab3100_get_register_interruptible(struct ab3100 *ab3100, u8 reg, u8 *regval) |
Linus Walleij | 14fa569 | 2009-05-21 23:17:06 +0200 | [diff] [blame] | 153 | { |
| 154 | int err; |
| 155 | |
| 156 | err = mutex_lock_interruptible(&ab3100->access_mutex); |
| 157 | if (err) |
| 158 | return err; |
| 159 | |
| 160 | /* |
| 161 | * AB3100 require an I2C "stop" command between each message, else |
| 162 | * it will not work. The only way of achieveing this with the |
| 163 | * message transport layer is to send the read and write messages |
| 164 | * separately. |
| 165 | */ |
| 166 | err = i2c_master_send(ab3100->i2c_client, ®, 1); |
| 167 | if (err < 0) { |
| 168 | dev_err(ab3100->dev, |
| 169 | "write error (send register address): %d\n", |
| 170 | err); |
| 171 | goto get_reg_out_unlock; |
| 172 | } else if (err != 1) { |
| 173 | dev_err(ab3100->dev, |
| 174 | "write error (send register address) " |
| 175 | "%d bytes transferred (expected 1)\n", |
| 176 | err); |
| 177 | err = -EIO; |
| 178 | goto get_reg_out_unlock; |
| 179 | } else { |
| 180 | /* All is well */ |
| 181 | err = 0; |
| 182 | } |
| 183 | |
| 184 | err = i2c_master_recv(ab3100->i2c_client, regval, 1); |
| 185 | if (err < 0) { |
| 186 | dev_err(ab3100->dev, |
| 187 | "write error (read register): %d\n", |
| 188 | err); |
| 189 | goto get_reg_out_unlock; |
| 190 | } else if (err != 1) { |
| 191 | dev_err(ab3100->dev, |
| 192 | "write error (read register) " |
| 193 | "%d bytes transferred (expected 1)\n", |
| 194 | err); |
| 195 | err = -EIO; |
| 196 | goto get_reg_out_unlock; |
| 197 | } else { |
| 198 | /* All is well */ |
| 199 | err = 0; |
| 200 | } |
| 201 | |
| 202 | get_reg_out_unlock: |
| 203 | mutex_unlock(&ab3100->access_mutex); |
| 204 | return err; |
| 205 | } |
Linus Walleij | 956f25a | 2009-08-13 11:49:23 +0200 | [diff] [blame] | 206 | EXPORT_SYMBOL(ab3100_get_register_interruptible); |
Linus Walleij | 14fa569 | 2009-05-21 23:17:06 +0200 | [diff] [blame] | 207 | |
Linus Walleij | 956f25a | 2009-08-13 11:49:23 +0200 | [diff] [blame] | 208 | |
| 209 | int ab3100_get_register_page_interruptible(struct ab3100 *ab3100, |
Linus Walleij | 14fa569 | 2009-05-21 23:17:06 +0200 | [diff] [blame] | 210 | u8 first_reg, u8 *regvals, u8 numregs) |
| 211 | { |
| 212 | int err; |
| 213 | |
| 214 | if (ab3100->chip_id == 0xa0 || |
| 215 | ab3100->chip_id == 0xa1) |
| 216 | /* These don't support paged reads */ |
| 217 | return -EIO; |
| 218 | |
| 219 | err = mutex_lock_interruptible(&ab3100->access_mutex); |
| 220 | if (err) |
| 221 | return err; |
| 222 | |
| 223 | /* |
| 224 | * Paged read also require an I2C "stop" command. |
| 225 | */ |
| 226 | err = i2c_master_send(ab3100->i2c_client, &first_reg, 1); |
| 227 | if (err < 0) { |
| 228 | dev_err(ab3100->dev, |
| 229 | "write error (send first register address): %d\n", |
| 230 | err); |
| 231 | goto get_reg_page_out_unlock; |
| 232 | } else if (err != 1) { |
| 233 | dev_err(ab3100->dev, |
| 234 | "write error (send first register address) " |
| 235 | "%d bytes transferred (expected 1)\n", |
| 236 | err); |
| 237 | err = -EIO; |
| 238 | goto get_reg_page_out_unlock; |
| 239 | } |
| 240 | |
| 241 | err = i2c_master_recv(ab3100->i2c_client, regvals, numregs); |
| 242 | if (err < 0) { |
| 243 | dev_err(ab3100->dev, |
| 244 | "write error (read register page): %d\n", |
| 245 | err); |
| 246 | goto get_reg_page_out_unlock; |
| 247 | } else if (err != numregs) { |
| 248 | dev_err(ab3100->dev, |
| 249 | "write error (read register page) " |
| 250 | "%d bytes transferred (expected %d)\n", |
| 251 | err, numregs); |
| 252 | err = -EIO; |
| 253 | goto get_reg_page_out_unlock; |
| 254 | } |
| 255 | |
| 256 | /* All is well */ |
| 257 | err = 0; |
| 258 | |
| 259 | get_reg_page_out_unlock: |
| 260 | mutex_unlock(&ab3100->access_mutex); |
| 261 | return err; |
| 262 | } |
Linus Walleij | 956f25a | 2009-08-13 11:49:23 +0200 | [diff] [blame] | 263 | EXPORT_SYMBOL(ab3100_get_register_page_interruptible); |
Linus Walleij | 14fa569 | 2009-05-21 23:17:06 +0200 | [diff] [blame] | 264 | |
Linus Walleij | 956f25a | 2009-08-13 11:49:23 +0200 | [diff] [blame] | 265 | |
| 266 | int ab3100_mask_and_set_register_interruptible(struct ab3100 *ab3100, |
Linus Walleij | 14fa569 | 2009-05-21 23:17:06 +0200 | [diff] [blame] | 267 | u8 reg, u8 andmask, u8 ormask) |
| 268 | { |
| 269 | u8 regandval[2] = {reg, 0}; |
| 270 | int err; |
| 271 | |
| 272 | err = mutex_lock_interruptible(&ab3100->access_mutex); |
| 273 | if (err) |
| 274 | return err; |
| 275 | |
| 276 | /* First read out the target register */ |
| 277 | err = i2c_master_send(ab3100->i2c_client, ®, 1); |
| 278 | if (err < 0) { |
| 279 | dev_err(ab3100->dev, |
| 280 | "write error (maskset send address): %d\n", |
| 281 | err); |
| 282 | goto get_maskset_unlock; |
| 283 | } else if (err != 1) { |
| 284 | dev_err(ab3100->dev, |
| 285 | "write error (maskset send address) " |
| 286 | "%d bytes transferred (expected 1)\n", |
| 287 | err); |
| 288 | err = -EIO; |
| 289 | goto get_maskset_unlock; |
| 290 | } |
| 291 | |
| 292 | err = i2c_master_recv(ab3100->i2c_client, ®andval[1], 1); |
| 293 | if (err < 0) { |
| 294 | dev_err(ab3100->dev, |
| 295 | "write error (maskset read register): %d\n", |
| 296 | err); |
| 297 | goto get_maskset_unlock; |
| 298 | } else if (err != 1) { |
| 299 | dev_err(ab3100->dev, |
| 300 | "write error (maskset read register) " |
| 301 | "%d bytes transferred (expected 1)\n", |
| 302 | err); |
| 303 | err = -EIO; |
| 304 | goto get_maskset_unlock; |
| 305 | } |
| 306 | |
| 307 | /* Modify the register */ |
| 308 | regandval[1] &= andmask; |
| 309 | regandval[1] |= ormask; |
| 310 | |
| 311 | /* Write the register */ |
| 312 | err = i2c_master_send(ab3100->i2c_client, regandval, 2); |
| 313 | if (err < 0) { |
| 314 | dev_err(ab3100->dev, |
| 315 | "write error (write register): %d\n", |
| 316 | err); |
| 317 | goto get_maskset_unlock; |
| 318 | } else if (err != 2) { |
| 319 | dev_err(ab3100->dev, |
| 320 | "write error (write register) " |
| 321 | "%d bytes transferred (expected 2)\n", |
| 322 | err); |
| 323 | err = -EIO; |
| 324 | goto get_maskset_unlock; |
| 325 | } |
| 326 | |
| 327 | /* All is well */ |
| 328 | err = 0; |
| 329 | |
| 330 | get_maskset_unlock: |
| 331 | mutex_unlock(&ab3100->access_mutex); |
| 332 | return err; |
| 333 | } |
Linus Walleij | 956f25a | 2009-08-13 11:49:23 +0200 | [diff] [blame] | 334 | EXPORT_SYMBOL(ab3100_mask_and_set_register_interruptible); |
| 335 | |
Linus Walleij | 14fa569 | 2009-05-21 23:17:06 +0200 | [diff] [blame] | 336 | |
| 337 | /* |
| 338 | * Register a simple callback for handling any AB3100 events. |
| 339 | */ |
| 340 | int ab3100_event_register(struct ab3100 *ab3100, |
| 341 | struct notifier_block *nb) |
| 342 | { |
| 343 | return blocking_notifier_chain_register(&ab3100->event_subscribers, |
| 344 | nb); |
| 345 | } |
| 346 | EXPORT_SYMBOL(ab3100_event_register); |
| 347 | |
| 348 | /* |
| 349 | * Remove a previously registered callback. |
| 350 | */ |
| 351 | int ab3100_event_unregister(struct ab3100 *ab3100, |
| 352 | struct notifier_block *nb) |
| 353 | { |
| 354 | return blocking_notifier_chain_unregister(&ab3100->event_subscribers, |
| 355 | nb); |
| 356 | } |
| 357 | EXPORT_SYMBOL(ab3100_event_unregister); |
| 358 | |
| 359 | |
| 360 | int ab3100_event_registers_startup_state_get(struct ab3100 *ab3100, |
| 361 | u32 *fatevent) |
| 362 | { |
| 363 | if (!ab3100->startup_events_read) |
| 364 | return -EAGAIN; /* Try again later */ |
| 365 | *fatevent = ab3100->startup_events; |
| 366 | return 0; |
| 367 | } |
| 368 | EXPORT_SYMBOL(ab3100_event_registers_startup_state_get); |
| 369 | |
| 370 | /* Interrupt handling worker */ |
| 371 | static void ab3100_work(struct work_struct *work) |
| 372 | { |
| 373 | struct ab3100 *ab3100 = container_of(work, struct ab3100, work); |
| 374 | u8 event_regs[3]; |
| 375 | u32 fatevent; |
| 376 | int err; |
| 377 | |
Linus Walleij | 956f25a | 2009-08-13 11:49:23 +0200 | [diff] [blame] | 378 | err = ab3100_get_register_page_interruptible(ab3100, AB3100_EVENTA1, |
Linus Walleij | 14fa569 | 2009-05-21 23:17:06 +0200 | [diff] [blame] | 379 | event_regs, 3); |
| 380 | if (err) |
| 381 | goto err_event_wq; |
| 382 | |
| 383 | fatevent = (event_regs[0] << 16) | |
| 384 | (event_regs[1] << 8) | |
| 385 | event_regs[2]; |
| 386 | |
| 387 | if (!ab3100->startup_events_read) { |
| 388 | ab3100->startup_events = fatevent; |
| 389 | ab3100->startup_events_read = true; |
| 390 | } |
| 391 | /* |
| 392 | * The notified parties will have to mask out the events |
| 393 | * they're interested in and react to them. They will be |
| 394 | * notified on all events, then they use the fatevent value |
| 395 | * to determine if they're interested. |
| 396 | */ |
| 397 | blocking_notifier_call_chain(&ab3100->event_subscribers, |
| 398 | fatevent, NULL); |
| 399 | |
| 400 | dev_dbg(ab3100->dev, |
| 401 | "IRQ Event: 0x%08x\n", fatevent); |
| 402 | |
| 403 | /* By now the IRQ should be acked and deasserted so enable it again */ |
| 404 | enable_irq(ab3100->i2c_client->irq); |
| 405 | return; |
| 406 | |
| 407 | err_event_wq: |
| 408 | dev_dbg(ab3100->dev, |
| 409 | "error in event workqueue\n"); |
| 410 | /* Enable the IRQ anyway, what choice do we have? */ |
| 411 | enable_irq(ab3100->i2c_client->irq); |
| 412 | return; |
| 413 | } |
| 414 | |
| 415 | static irqreturn_t ab3100_irq_handler(int irq, void *data) |
| 416 | { |
| 417 | struct ab3100 *ab3100 = data; |
| 418 | /* |
| 419 | * Disable the IRQ and dispatch a worker to handle the |
| 420 | * event. Since the chip resides on I2C this is slow |
| 421 | * stuff and we will re-enable the interrupts once th |
| 422 | * worker has finished. |
| 423 | */ |
Linus Walleij | 0ad651c | 2009-08-13 11:50:01 +0200 | [diff] [blame] | 424 | disable_irq_nosync(irq); |
Linus Walleij | 14fa569 | 2009-05-21 23:17:06 +0200 | [diff] [blame] | 425 | schedule_work(&ab3100->work); |
| 426 | return IRQ_HANDLED; |
| 427 | } |
| 428 | |
| 429 | #ifdef CONFIG_DEBUG_FS |
| 430 | /* |
| 431 | * Some debugfs entries only exposed if we're using debug |
| 432 | */ |
| 433 | static int ab3100_registers_print(struct seq_file *s, void *p) |
| 434 | { |
| 435 | struct ab3100 *ab3100 = s->private; |
| 436 | u8 value; |
| 437 | u8 reg; |
| 438 | |
| 439 | seq_printf(s, "AB3100 registers:\n"); |
| 440 | |
| 441 | for (reg = 0; reg < 0xff; reg++) { |
Linus Walleij | 956f25a | 2009-08-13 11:49:23 +0200 | [diff] [blame] | 442 | ab3100_get_register_interruptible(ab3100, reg, &value); |
Linus Walleij | 14fa569 | 2009-05-21 23:17:06 +0200 | [diff] [blame] | 443 | seq_printf(s, "[0x%x]: 0x%x\n", reg, value); |
| 444 | } |
| 445 | return 0; |
| 446 | } |
| 447 | |
| 448 | static int ab3100_registers_open(struct inode *inode, struct file *file) |
| 449 | { |
| 450 | return single_open(file, ab3100_registers_print, inode->i_private); |
| 451 | } |
| 452 | |
| 453 | static const struct file_operations ab3100_registers_fops = { |
| 454 | .open = ab3100_registers_open, |
| 455 | .read = seq_read, |
| 456 | .llseek = seq_lseek, |
| 457 | .release = single_release, |
| 458 | .owner = THIS_MODULE, |
| 459 | }; |
| 460 | |
| 461 | struct ab3100_get_set_reg_priv { |
| 462 | struct ab3100 *ab3100; |
| 463 | bool mode; |
| 464 | }; |
| 465 | |
| 466 | static int ab3100_get_set_reg_open_file(struct inode *inode, struct file *file) |
| 467 | { |
| 468 | file->private_data = inode->i_private; |
| 469 | return 0; |
| 470 | } |
| 471 | |
Samuel Ortiz | dfc3aa7 | 2009-06-23 10:48:36 +0200 | [diff] [blame] | 472 | static ssize_t ab3100_get_set_reg(struct file *file, |
| 473 | const char __user *user_buf, |
| 474 | size_t count, loff_t *ppos) |
Linus Walleij | 14fa569 | 2009-05-21 23:17:06 +0200 | [diff] [blame] | 475 | { |
| 476 | struct ab3100_get_set_reg_priv *priv = file->private_data; |
| 477 | struct ab3100 *ab3100 = priv->ab3100; |
| 478 | char buf[32]; |
Samuel Ortiz | dfc3aa7 | 2009-06-23 10:48:36 +0200 | [diff] [blame] | 479 | ssize_t buf_size; |
Linus Walleij | 14fa569 | 2009-05-21 23:17:06 +0200 | [diff] [blame] | 480 | int regp; |
| 481 | unsigned long user_reg; |
| 482 | int err; |
| 483 | int i = 0; |
| 484 | |
| 485 | /* Get userspace string and assure termination */ |
| 486 | buf_size = min(count, (sizeof(buf)-1)); |
| 487 | if (copy_from_user(buf, user_buf, buf_size)) |
| 488 | return -EFAULT; |
| 489 | buf[buf_size] = 0; |
| 490 | |
| 491 | /* |
| 492 | * The idea is here to parse a string which is either |
| 493 | * "0xnn" for reading a register, or "0xaa 0xbb" for |
| 494 | * writing 0xbb to the register 0xaa. First move past |
| 495 | * whitespace and then begin to parse the register. |
| 496 | */ |
| 497 | while ((i < buf_size) && (buf[i] == ' ')) |
| 498 | i++; |
| 499 | regp = i; |
| 500 | |
| 501 | /* |
| 502 | * Advance pointer to end of string then terminate |
| 503 | * the register string. This is needed to satisfy |
| 504 | * the strict_strtoul() function. |
| 505 | */ |
| 506 | while ((i < buf_size) && (buf[i] != ' ')) |
| 507 | i++; |
| 508 | buf[i] = '\0'; |
| 509 | |
| 510 | err = strict_strtoul(&buf[regp], 16, &user_reg); |
| 511 | if (err) |
| 512 | return err; |
| 513 | if (user_reg > 0xff) |
| 514 | return -EINVAL; |
| 515 | |
| 516 | /* Either we read or we write a register here */ |
| 517 | if (!priv->mode) { |
| 518 | /* Reading */ |
| 519 | u8 reg = (u8) user_reg; |
| 520 | u8 regvalue; |
| 521 | |
Linus Walleij | 956f25a | 2009-08-13 11:49:23 +0200 | [diff] [blame] | 522 | ab3100_get_register_interruptible(ab3100, reg, ®value); |
Linus Walleij | 14fa569 | 2009-05-21 23:17:06 +0200 | [diff] [blame] | 523 | |
| 524 | dev_info(ab3100->dev, |
| 525 | "debug read AB3100 reg[0x%02x]: 0x%02x\n", |
| 526 | reg, regvalue); |
| 527 | } else { |
| 528 | int valp; |
| 529 | unsigned long user_value; |
| 530 | u8 reg = (u8) user_reg; |
| 531 | u8 value; |
| 532 | u8 regvalue; |
| 533 | |
| 534 | /* |
| 535 | * Writing, we need some value to write to |
| 536 | * the register so keep parsing the string |
| 537 | * from userspace. |
| 538 | */ |
| 539 | i++; |
| 540 | while ((i < buf_size) && (buf[i] == ' ')) |
| 541 | i++; |
| 542 | valp = i; |
| 543 | while ((i < buf_size) && (buf[i] != ' ')) |
| 544 | i++; |
| 545 | buf[i] = '\0'; |
| 546 | |
| 547 | err = strict_strtoul(&buf[valp], 16, &user_value); |
| 548 | if (err) |
| 549 | return err; |
| 550 | if (user_reg > 0xff) |
| 551 | return -EINVAL; |
| 552 | |
| 553 | value = (u8) user_value; |
Linus Walleij | 956f25a | 2009-08-13 11:49:23 +0200 | [diff] [blame] | 554 | ab3100_set_register_interruptible(ab3100, reg, value); |
| 555 | ab3100_get_register_interruptible(ab3100, reg, ®value); |
Linus Walleij | 14fa569 | 2009-05-21 23:17:06 +0200 | [diff] [blame] | 556 | |
| 557 | dev_info(ab3100->dev, |
| 558 | "debug write reg[0x%02x] with 0x%02x, " |
| 559 | "after readback: 0x%02x\n", |
| 560 | reg, value, regvalue); |
| 561 | } |
| 562 | return buf_size; |
| 563 | } |
| 564 | |
| 565 | static const struct file_operations ab3100_get_set_reg_fops = { |
| 566 | .open = ab3100_get_set_reg_open_file, |
| 567 | .write = ab3100_get_set_reg, |
| 568 | }; |
| 569 | |
| 570 | static struct dentry *ab3100_dir; |
| 571 | static struct dentry *ab3100_reg_file; |
| 572 | static struct ab3100_get_set_reg_priv ab3100_get_priv; |
| 573 | static struct dentry *ab3100_get_reg_file; |
| 574 | static struct ab3100_get_set_reg_priv ab3100_set_priv; |
| 575 | static struct dentry *ab3100_set_reg_file; |
| 576 | |
| 577 | static void ab3100_setup_debugfs(struct ab3100 *ab3100) |
| 578 | { |
| 579 | int err; |
| 580 | |
| 581 | ab3100_dir = debugfs_create_dir("ab3100", NULL); |
| 582 | if (!ab3100_dir) |
| 583 | goto exit_no_debugfs; |
| 584 | |
| 585 | ab3100_reg_file = debugfs_create_file("registers", |
| 586 | S_IRUGO, ab3100_dir, ab3100, |
| 587 | &ab3100_registers_fops); |
| 588 | if (!ab3100_reg_file) { |
| 589 | err = -ENOMEM; |
| 590 | goto exit_destroy_dir; |
| 591 | } |
| 592 | |
| 593 | ab3100_get_priv.ab3100 = ab3100; |
| 594 | ab3100_get_priv.mode = false; |
| 595 | ab3100_get_reg_file = debugfs_create_file("get_reg", |
| 596 | S_IWUGO, ab3100_dir, &ab3100_get_priv, |
| 597 | &ab3100_get_set_reg_fops); |
| 598 | if (!ab3100_get_reg_file) { |
| 599 | err = -ENOMEM; |
| 600 | goto exit_destroy_reg; |
| 601 | } |
| 602 | |
| 603 | ab3100_set_priv.ab3100 = ab3100; |
| 604 | ab3100_set_priv.mode = true; |
| 605 | ab3100_set_reg_file = debugfs_create_file("set_reg", |
| 606 | S_IWUGO, ab3100_dir, &ab3100_set_priv, |
| 607 | &ab3100_get_set_reg_fops); |
| 608 | if (!ab3100_set_reg_file) { |
| 609 | err = -ENOMEM; |
| 610 | goto exit_destroy_get_reg; |
| 611 | } |
| 612 | return; |
| 613 | |
| 614 | exit_destroy_get_reg: |
| 615 | debugfs_remove(ab3100_get_reg_file); |
| 616 | exit_destroy_reg: |
| 617 | debugfs_remove(ab3100_reg_file); |
| 618 | exit_destroy_dir: |
| 619 | debugfs_remove(ab3100_dir); |
| 620 | exit_no_debugfs: |
| 621 | return; |
| 622 | } |
| 623 | static inline void ab3100_remove_debugfs(void) |
| 624 | { |
| 625 | debugfs_remove(ab3100_set_reg_file); |
| 626 | debugfs_remove(ab3100_get_reg_file); |
| 627 | debugfs_remove(ab3100_reg_file); |
| 628 | debugfs_remove(ab3100_dir); |
| 629 | } |
| 630 | #else |
| 631 | static inline void ab3100_setup_debugfs(struct ab3100 *ab3100) |
| 632 | { |
| 633 | } |
| 634 | static inline void ab3100_remove_debugfs(void) |
| 635 | { |
| 636 | } |
| 637 | #endif |
| 638 | |
| 639 | /* |
| 640 | * Basic set-up, datastructure creation/destruction and I2C interface. |
| 641 | * This sets up a default config in the AB3100 chip so that it |
| 642 | * will work as expected. |
| 643 | */ |
| 644 | |
| 645 | struct ab3100_init_setting { |
| 646 | u8 abreg; |
| 647 | u8 setting; |
| 648 | }; |
| 649 | |
Andrew Morton | 00d3803 | 2009-09-21 17:01:07 -0700 | [diff] [blame] | 650 | static const struct ab3100_init_setting __initconst |
Linus Walleij | 14fa569 | 2009-05-21 23:17:06 +0200 | [diff] [blame] | 651 | ab3100_init_settings[] = { |
| 652 | { |
| 653 | .abreg = AB3100_MCA, |
| 654 | .setting = 0x01 |
| 655 | }, { |
| 656 | .abreg = AB3100_MCB, |
| 657 | .setting = 0x30 |
| 658 | }, { |
| 659 | .abreg = AB3100_IMRA1, |
| 660 | .setting = 0x00 |
| 661 | }, { |
| 662 | .abreg = AB3100_IMRA2, |
| 663 | .setting = 0xFF |
| 664 | }, { |
| 665 | .abreg = AB3100_IMRA3, |
| 666 | .setting = 0x01 |
| 667 | }, { |
| 668 | .abreg = AB3100_IMRB1, |
Linus Walleij | ce290b0 | 2009-08-13 11:49:49 +0200 | [diff] [blame] | 669 | .setting = 0xBF |
Linus Walleij | 14fa569 | 2009-05-21 23:17:06 +0200 | [diff] [blame] | 670 | }, { |
| 671 | .abreg = AB3100_IMRB2, |
| 672 | .setting = 0xFF |
| 673 | }, { |
| 674 | .abreg = AB3100_IMRB3, |
| 675 | .setting = 0xFF |
| 676 | }, { |
| 677 | .abreg = AB3100_SUP, |
| 678 | .setting = 0x00 |
| 679 | }, { |
| 680 | .abreg = AB3100_DIS, |
| 681 | .setting = 0xF0 |
| 682 | }, { |
| 683 | .abreg = AB3100_D0C, |
| 684 | .setting = 0x00 |
| 685 | }, { |
| 686 | .abreg = AB3100_D1C, |
| 687 | .setting = 0x00 |
| 688 | }, { |
| 689 | .abreg = AB3100_D2C, |
| 690 | .setting = 0x00 |
| 691 | }, { |
| 692 | .abreg = AB3100_D3C, |
| 693 | .setting = 0x00 |
| 694 | }, |
| 695 | }; |
| 696 | |
| 697 | static int __init ab3100_setup(struct ab3100 *ab3100) |
| 698 | { |
| 699 | int err = 0; |
| 700 | int i; |
| 701 | |
| 702 | for (i = 0; i < ARRAY_SIZE(ab3100_init_settings); i++) { |
Linus Walleij | 956f25a | 2009-08-13 11:49:23 +0200 | [diff] [blame] | 703 | err = ab3100_set_register_interruptible(ab3100, |
Linus Walleij | 14fa569 | 2009-05-21 23:17:06 +0200 | [diff] [blame] | 704 | ab3100_init_settings[i].abreg, |
| 705 | ab3100_init_settings[i].setting); |
| 706 | if (err) |
| 707 | goto exit_no_setup; |
| 708 | } |
| 709 | |
| 710 | /* |
| 711 | * Special trick to make the AB3100 use the 32kHz clock (RTC) |
Linus Walleij | 956f25a | 2009-08-13 11:49:23 +0200 | [diff] [blame] | 712 | * bit 3 in test register 0x02 is a special, undocumented test |
Linus Walleij | 14fa569 | 2009-05-21 23:17:06 +0200 | [diff] [blame] | 713 | * register bit that only exist in AB3100 P1E |
| 714 | */ |
| 715 | if (ab3100->chip_id == 0xc4) { |
| 716 | dev_warn(ab3100->dev, |
| 717 | "AB3100 P1E variant detected, " |
| 718 | "forcing chip to 32KHz\n"); |
Linus Walleij | 956f25a | 2009-08-13 11:49:23 +0200 | [diff] [blame] | 719 | err = ab3100_set_test_register_interruptible(ab3100, 0x02, 0x08); |
Linus Walleij | 14fa569 | 2009-05-21 23:17:06 +0200 | [diff] [blame] | 720 | } |
| 721 | |
| 722 | exit_no_setup: |
| 723 | return err; |
| 724 | } |
| 725 | |
| 726 | /* |
| 727 | * Here we define all the platform devices that appear |
| 728 | * as children of the AB3100. These are regular platform |
| 729 | * devices with the IORESOURCE_IO .start and .end set |
| 730 | * to correspond to the internal AB3100 register range |
| 731 | * mapping to the corresponding subdevice. |
| 732 | */ |
| 733 | |
| 734 | #define AB3100_DEVICE(devname, devid) \ |
| 735 | static struct platform_device ab3100_##devname##_device = { \ |
| 736 | .name = devid, \ |
| 737 | .id = -1, \ |
| 738 | } |
| 739 | |
| 740 | /* |
| 741 | * This lists all the subdevices and corresponding register |
| 742 | * ranges. |
| 743 | */ |
| 744 | AB3100_DEVICE(dac, "ab3100-dac"); |
| 745 | AB3100_DEVICE(leds, "ab3100-leds"); |
| 746 | AB3100_DEVICE(power, "ab3100-power"); |
| 747 | AB3100_DEVICE(regulators, "ab3100-regulators"); |
| 748 | AB3100_DEVICE(sim, "ab3100-sim"); |
| 749 | AB3100_DEVICE(uart, "ab3100-uart"); |
| 750 | AB3100_DEVICE(rtc, "ab3100-rtc"); |
| 751 | AB3100_DEVICE(charger, "ab3100-charger"); |
| 752 | AB3100_DEVICE(boost, "ab3100-boost"); |
| 753 | AB3100_DEVICE(adc, "ab3100-adc"); |
| 754 | AB3100_DEVICE(fuelgauge, "ab3100-fuelgauge"); |
| 755 | AB3100_DEVICE(vibrator, "ab3100-vibrator"); |
| 756 | AB3100_DEVICE(otp, "ab3100-otp"); |
| 757 | AB3100_DEVICE(codec, "ab3100-codec"); |
| 758 | |
| 759 | static struct platform_device * |
| 760 | ab3100_platform_devs[] = { |
| 761 | &ab3100_dac_device, |
| 762 | &ab3100_leds_device, |
| 763 | &ab3100_power_device, |
| 764 | &ab3100_regulators_device, |
| 765 | &ab3100_sim_device, |
| 766 | &ab3100_uart_device, |
| 767 | &ab3100_rtc_device, |
| 768 | &ab3100_charger_device, |
| 769 | &ab3100_boost_device, |
| 770 | &ab3100_adc_device, |
| 771 | &ab3100_fuelgauge_device, |
| 772 | &ab3100_vibrator_device, |
| 773 | &ab3100_otp_device, |
| 774 | &ab3100_codec_device, |
| 775 | }; |
| 776 | |
| 777 | struct ab_family_id { |
| 778 | u8 id; |
| 779 | char *name; |
| 780 | }; |
| 781 | |
| 782 | static const struct ab_family_id ids[] __initdata = { |
| 783 | /* AB3100 */ |
| 784 | { |
| 785 | .id = 0xc0, |
| 786 | .name = "P1A" |
| 787 | }, { |
| 788 | .id = 0xc1, |
| 789 | .name = "P1B" |
| 790 | }, { |
| 791 | .id = 0xc2, |
| 792 | .name = "P1C" |
| 793 | }, { |
| 794 | .id = 0xc3, |
| 795 | .name = "P1D" |
| 796 | }, { |
| 797 | .id = 0xc4, |
| 798 | .name = "P1E" |
| 799 | }, { |
| 800 | .id = 0xc5, |
| 801 | .name = "P1F/R1A" |
| 802 | }, { |
| 803 | .id = 0xc6, |
| 804 | .name = "P1G/R1A" |
| 805 | }, { |
| 806 | .id = 0xc7, |
| 807 | .name = "P2A/R2A" |
| 808 | }, { |
| 809 | .id = 0xc8, |
| 810 | .name = "P2B/R2B" |
| 811 | }, |
| 812 | /* AB3000 variants, not supported */ |
| 813 | { |
| 814 | .id = 0xa0 |
| 815 | }, { |
| 816 | .id = 0xa1 |
| 817 | }, { |
| 818 | .id = 0xa2 |
| 819 | }, { |
| 820 | .id = 0xa3 |
| 821 | }, { |
| 822 | .id = 0xa4 |
| 823 | }, { |
| 824 | .id = 0xa5 |
| 825 | }, { |
| 826 | .id = 0xa6 |
| 827 | }, { |
| 828 | .id = 0xa7 |
| 829 | }, |
| 830 | /* Terminator */ |
| 831 | { |
| 832 | .id = 0x00, |
| 833 | }, |
| 834 | }; |
| 835 | |
| 836 | static int __init ab3100_probe(struct i2c_client *client, |
| 837 | const struct i2c_device_id *id) |
| 838 | { |
| 839 | struct ab3100 *ab3100; |
Linus Walleij | d619bc1 | 2009-09-09 11:31:00 +0200 | [diff] [blame] | 840 | struct ab3100_platform_data *ab3100_plf_data = |
| 841 | client->dev.platform_data; |
Linus Walleij | 14fa569 | 2009-05-21 23:17:06 +0200 | [diff] [blame] | 842 | int err; |
| 843 | int i; |
| 844 | |
| 845 | ab3100 = kzalloc(sizeof(struct ab3100), GFP_KERNEL); |
| 846 | if (!ab3100) { |
| 847 | dev_err(&client->dev, "could not allocate AB3100 device\n"); |
| 848 | return -ENOMEM; |
| 849 | } |
| 850 | |
| 851 | /* Initialize data structure */ |
| 852 | mutex_init(&ab3100->access_mutex); |
| 853 | BLOCKING_INIT_NOTIFIER_HEAD(&ab3100->event_subscribers); |
| 854 | |
| 855 | ab3100->i2c_client = client; |
| 856 | ab3100->dev = &ab3100->i2c_client->dev; |
| 857 | |
| 858 | i2c_set_clientdata(client, ab3100); |
| 859 | |
| 860 | /* Read chip ID register */ |
Linus Walleij | 956f25a | 2009-08-13 11:49:23 +0200 | [diff] [blame] | 861 | err = ab3100_get_register_interruptible(ab3100, AB3100_CID, |
| 862 | &ab3100->chip_id); |
Linus Walleij | 14fa569 | 2009-05-21 23:17:06 +0200 | [diff] [blame] | 863 | if (err) { |
| 864 | dev_err(&client->dev, |
| 865 | "could not communicate with the AB3100 analog " |
| 866 | "baseband chip\n"); |
| 867 | goto exit_no_detect; |
| 868 | } |
| 869 | |
| 870 | for (i = 0; ids[i].id != 0x0; i++) { |
| 871 | if (ids[i].id == ab3100->chip_id) { |
| 872 | if (ids[i].name != NULL) { |
| 873 | snprintf(&ab3100->chip_name[0], |
| 874 | sizeof(ab3100->chip_name) - 1, |
| 875 | "AB3100 %s", |
| 876 | ids[i].name); |
| 877 | break; |
| 878 | } else { |
| 879 | dev_err(&client->dev, |
| 880 | "AB3000 is not supported\n"); |
| 881 | goto exit_no_detect; |
| 882 | } |
| 883 | } |
| 884 | } |
| 885 | |
| 886 | if (ids[i].id == 0x0) { |
| 887 | dev_err(&client->dev, "unknown analog baseband chip id: 0x%x\n", |
| 888 | ab3100->chip_id); |
| 889 | dev_err(&client->dev, "accepting it anyway. Please update " |
| 890 | "the driver.\n"); |
| 891 | goto exit_no_detect; |
| 892 | } |
| 893 | |
| 894 | dev_info(&client->dev, "Detected chip: %s\n", |
| 895 | &ab3100->chip_name[0]); |
| 896 | |
| 897 | /* Attach a second dummy i2c_client to the test register address */ |
| 898 | ab3100->testreg_client = i2c_new_dummy(client->adapter, |
| 899 | client->addr + 1); |
| 900 | if (!ab3100->testreg_client) { |
| 901 | err = -ENOMEM; |
| 902 | goto exit_no_testreg_client; |
| 903 | } |
| 904 | |
| 905 | strlcpy(ab3100->testreg_client->name, id->name, |
| 906 | sizeof(ab3100->testreg_client->name)); |
| 907 | |
| 908 | err = ab3100_setup(ab3100); |
| 909 | if (err) |
| 910 | goto exit_no_setup; |
| 911 | |
| 912 | INIT_WORK(&ab3100->work, ab3100_work); |
| 913 | |
| 914 | /* This real unpredictable IRQ is of course sampled for entropy */ |
| 915 | err = request_irq(client->irq, ab3100_irq_handler, |
| 916 | IRQF_DISABLED | IRQF_SAMPLE_RANDOM, |
| 917 | "AB3100 IRQ", ab3100); |
| 918 | if (err) |
| 919 | goto exit_no_irq; |
| 920 | |
| 921 | /* Set parent and a pointer back to the container in device data */ |
| 922 | for (i = 0; i < ARRAY_SIZE(ab3100_platform_devs); i++) { |
| 923 | ab3100_platform_devs[i]->dev.parent = |
| 924 | &client->dev; |
Linus Walleij | d619bc1 | 2009-09-09 11:31:00 +0200 | [diff] [blame] | 925 | ab3100_platform_devs[i]->dev.platform_data = |
| 926 | ab3100_plf_data; |
Linus Walleij | 14fa569 | 2009-05-21 23:17:06 +0200 | [diff] [blame] | 927 | platform_set_drvdata(ab3100_platform_devs[i], ab3100); |
| 928 | } |
| 929 | |
| 930 | /* Register the platform devices */ |
| 931 | platform_add_devices(ab3100_platform_devs, |
| 932 | ARRAY_SIZE(ab3100_platform_devs)); |
| 933 | |
| 934 | ab3100_setup_debugfs(ab3100); |
| 935 | |
| 936 | return 0; |
| 937 | |
| 938 | exit_no_irq: |
| 939 | exit_no_setup: |
| 940 | i2c_unregister_device(ab3100->testreg_client); |
| 941 | exit_no_testreg_client: |
| 942 | exit_no_detect: |
| 943 | kfree(ab3100); |
| 944 | return err; |
| 945 | } |
| 946 | |
| 947 | static int __exit ab3100_remove(struct i2c_client *client) |
| 948 | { |
| 949 | struct ab3100 *ab3100 = i2c_get_clientdata(client); |
| 950 | int i; |
| 951 | |
| 952 | /* Unregister subdevices */ |
| 953 | for (i = 0; i < ARRAY_SIZE(ab3100_platform_devs); i++) |
| 954 | platform_device_unregister(ab3100_platform_devs[i]); |
| 955 | |
| 956 | ab3100_remove_debugfs(); |
| 957 | i2c_unregister_device(ab3100->testreg_client); |
| 958 | |
| 959 | /* |
| 960 | * At this point, all subscribers should have unregistered |
| 961 | * their notifiers so deactivate IRQ |
| 962 | */ |
| 963 | free_irq(client->irq, ab3100); |
| 964 | kfree(ab3100); |
| 965 | return 0; |
| 966 | } |
| 967 | |
| 968 | static const struct i2c_device_id ab3100_id[] = { |
| 969 | { "ab3100", ab3100 }, |
| 970 | { } |
| 971 | }; |
| 972 | MODULE_DEVICE_TABLE(i2c, ab3100_id); |
| 973 | |
| 974 | static struct i2c_driver ab3100_driver = { |
| 975 | .driver = { |
| 976 | .name = "ab3100", |
| 977 | .owner = THIS_MODULE, |
| 978 | }, |
| 979 | .id_table = ab3100_id, |
| 980 | .probe = ab3100_probe, |
| 981 | .remove = __exit_p(ab3100_remove), |
| 982 | }; |
| 983 | |
| 984 | static int __init ab3100_i2c_init(void) |
| 985 | { |
| 986 | return i2c_add_driver(&ab3100_driver); |
| 987 | } |
| 988 | |
| 989 | static void __exit ab3100_i2c_exit(void) |
| 990 | { |
| 991 | i2c_del_driver(&ab3100_driver); |
| 992 | } |
| 993 | |
| 994 | subsys_initcall(ab3100_i2c_init); |
| 995 | module_exit(ab3100_i2c_exit); |
| 996 | |
| 997 | MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>"); |
| 998 | MODULE_DESCRIPTION("AB3100 core driver"); |
| 999 | MODULE_LICENSE("GPL"); |