Priyanka Mathur | 9591fff | 2012-12-13 13:07:32 -0800 | [diff] [blame] | 1 | /* Copyright (c) 2010-2011, 2013, The Linux Foundation. All rights reserved. |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 2 | * |
| 3 | * This program is free software; you can redistribute it and/or modify |
| 4 | * it under the terms of the GNU General Public License version 2 and |
| 5 | * only version 2 as published by the Free Software Foundation. |
| 6 | * |
| 7 | * This program is distributed in the hope that it will be useful, |
| 8 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 9 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 10 | * GNU General Public License for more details. |
| 11 | * |
| 12 | */ |
| 13 | #include <linux/debugfs.h> |
| 14 | #include <linux/delay.h> |
| 15 | #include <linux/errno.h> |
| 16 | #include <linux/init.h> |
| 17 | #include <linux/io.h> |
Priyanka Mathur | 49c6080 | 2012-12-13 12:53:58 -0800 | [diff] [blame] | 18 | #include <linux/of.h> |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 19 | #include <linux/kernel.h> |
| 20 | #include <linux/module.h> |
| 21 | #include <linux/platform_device.h> |
| 22 | #include <linux/sched.h> |
| 23 | #include <linux/slab.h> |
| 24 | #include <linux/types.h> |
| 25 | |
| 26 | #include <asm/uaccess.h> |
| 27 | |
| 28 | #include <mach/msm_iomap.h> |
| 29 | |
| 30 | #include "rpm_log.h" |
| 31 | |
| 32 | /* registers in MSM_RPM_LOG_PAGE_INDICES */ |
| 33 | enum { |
| 34 | MSM_RPM_LOG_TAIL, |
| 35 | MSM_RPM_LOG_HEAD |
| 36 | }; |
| 37 | |
| 38 | /* used to 4 byte align message lengths */ |
| 39 | #define PADDED_LENGTH(x) (0xFFFFFFFC & ((x) + 3)) |
| 40 | |
| 41 | /* calculates the character string length of a message of byte length x */ |
| 42 | #define PRINTED_LENGTH(x) ((x) * 6 + 3) |
| 43 | |
| 44 | /* number of ms to wait between checking for new messages in the RPM log */ |
| 45 | #define RECHECK_TIME (50) |
| 46 | |
Priyanka Mathur | 49c6080 | 2012-12-13 12:53:58 -0800 | [diff] [blame] | 47 | #define VERSION_8974 0x1000 |
| 48 | #define RPM_ULOG_LENGTH_SHIFT 16 |
| 49 | #define RPM_ULOG_LENGTH_MASK 0xFFFF0000 |
| 50 | |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 51 | struct msm_rpm_log_buffer { |
| 52 | char *data; |
| 53 | u32 len; |
| 54 | u32 pos; |
| 55 | u32 max_len; |
| 56 | u32 read_idx; |
| 57 | struct msm_rpm_log_platform_data *pdata; |
| 58 | }; |
| 59 | |
| 60 | /****************************************************************************** |
| 61 | * Internal functions |
| 62 | *****************************************************************************/ |
| 63 | |
| 64 | static inline u32 |
| 65 | msm_rpm_log_read(const struct msm_rpm_log_platform_data *pdata, u32 page, |
| 66 | u32 reg) |
| 67 | { |
| 68 | return readl_relaxed(pdata->reg_base + pdata->reg_offsets[page] |
| 69 | + reg * 4); |
| 70 | } |
| 71 | |
| 72 | /* |
| 73 | * msm_rpm_log_copy() - Copies messages from a volatile circular buffer in |
| 74 | * the RPM's shared memory into a private local buffer |
| 75 | * msg_buffer: pointer to local buffer (string) |
| 76 | * buf_len: length of local buffer in bytes |
| 77 | * read_start_idx: index into shared memory buffer |
| 78 | * |
| 79 | * Return value: number of bytes written to the local buffer |
| 80 | * |
| 81 | * Copies messages stored in a circular buffer in the RPM Message Memory into |
| 82 | * a specified local buffer. The RPM processor is unaware of these reading |
| 83 | * efforts, so care is taken to make sure that messages are valid both before |
| 84 | * and after reading. The RPM processor utilizes a ULog driver to write the |
| 85 | * log. The RPM processor maintains tail and head indices. These correspond |
| 86 | * to the next byte to write into, and the first valid byte, respectively. |
| 87 | * Both indices increase monotonically (except for rollover). |
| 88 | * |
| 89 | * Messages take the form of [(u32)length] [(char)data0,1,...] in which the |
| 90 | * length specifies the number of payload bytes. Messages must be 4 byte |
| 91 | * aligned, so padding is added at the end of a message as needed. |
| 92 | * |
| 93 | * Print format: |
| 94 | * - 0xXX, 0xXX, 0xXX |
| 95 | * - 0xXX |
| 96 | * etc... |
| 97 | */ |
| 98 | static u32 msm_rpm_log_copy(const struct msm_rpm_log_platform_data *pdata, |
| 99 | char *msg_buffer, u32 buf_len, u32 *read_idx) |
| 100 | { |
| 101 | u32 head_idx, tail_idx; |
| 102 | u32 pos = 0; |
| 103 | u32 i = 0; |
| 104 | u32 msg_len; |
| 105 | u32 pos_start; |
| 106 | char temp[4]; |
| 107 | |
| 108 | tail_idx = msm_rpm_log_read(pdata, MSM_RPM_LOG_PAGE_INDICES, |
| 109 | MSM_RPM_LOG_TAIL); |
| 110 | head_idx = msm_rpm_log_read(pdata, MSM_RPM_LOG_PAGE_INDICES, |
| 111 | MSM_RPM_LOG_HEAD); |
| 112 | |
| 113 | /* loop while the remote buffer has valid messages left to read */ |
| 114 | while (tail_idx - head_idx > 0 && tail_idx - *read_idx > 0) { |
| 115 | head_idx = msm_rpm_log_read(pdata, MSM_RPM_LOG_PAGE_INDICES, |
| 116 | MSM_RPM_LOG_HEAD); |
Priyanka Mathur | 9591fff | 2012-12-13 13:07:32 -0800 | [diff] [blame] | 117 | tail_idx = msm_rpm_log_read(pdata, MSM_RPM_LOG_PAGE_INDICES, |
| 118 | MSM_RPM_LOG_TAIL); |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 119 | /* check if the message to be read is valid */ |
| 120 | if (tail_idx - *read_idx > tail_idx - head_idx) { |
| 121 | *read_idx = head_idx; |
| 122 | continue; |
| 123 | } |
Priyanka Mathur | 49c6080 | 2012-12-13 12:53:58 -0800 | [diff] [blame] | 124 | |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 125 | /* |
Anji Jonnala | 9554fa3 | 2012-07-20 03:33:53 +0530 | [diff] [blame] | 126 | * Ensure that all indices are 4 byte aligned. |
| 127 | * This conditions is required to interact with a ULog buffer |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 128 | * properly. |
| 129 | */ |
Anji Jonnala | 9554fa3 | 2012-07-20 03:33:53 +0530 | [diff] [blame] | 130 | if (!IS_ALIGNED((tail_idx | head_idx | *read_idx), 4)) |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 131 | break; |
| 132 | |
| 133 | msg_len = msm_rpm_log_read(pdata, MSM_RPM_LOG_PAGE_BUFFER, |
Priyanka Mathur | 9591fff | 2012-12-13 13:07:32 -0800 | [diff] [blame] | 134 | ((*read_idx) & pdata->log_len_mask) >> 2); |
| 135 | |
Priyanka Mathur | 49c6080 | 2012-12-13 12:53:58 -0800 | [diff] [blame] | 136 | /* Message length for 8974 is first 2 bytes. |
| 137 | * Exclude message length and format from message length. |
| 138 | */ |
| 139 | if (pdata->version == VERSION_8974) { |
| 140 | msg_len = (msg_len & RPM_ULOG_LENGTH_MASK) >> |
| 141 | RPM_ULOG_LENGTH_SHIFT; |
| 142 | msg_len -= 4; |
| 143 | } |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 144 | |
| 145 | /* handle messages that claim to be longer than the log */ |
| 146 | if (PADDED_LENGTH(msg_len) > tail_idx - *read_idx - 4) |
| 147 | msg_len = tail_idx - *read_idx - 4; |
| 148 | |
| 149 | /* check that the local buffer has enough space for this msg */ |
| 150 | if (pos + PRINTED_LENGTH(msg_len) > buf_len) |
| 151 | break; |
| 152 | |
| 153 | pos_start = pos; |
| 154 | pos += scnprintf(msg_buffer + pos, buf_len - pos, "- "); |
| 155 | |
| 156 | /* copy message payload to local buffer */ |
| 157 | for (i = 0; i < msg_len; i++) { |
| 158 | /* read from shared memory 4 bytes at a time */ |
| 159 | if (IS_ALIGNED(i, 4)) |
| 160 | *((u32 *)temp) = msm_rpm_log_read(pdata, |
| 161 | MSM_RPM_LOG_PAGE_BUFFER, |
Priyanka Mathur | 9591fff | 2012-12-13 13:07:32 -0800 | [diff] [blame] | 162 | ((*read_idx + 4 + i) & |
| 163 | pdata->log_len_mask) >> 2); |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 164 | |
| 165 | pos += scnprintf(msg_buffer + pos, buf_len - pos, |
| 166 | "0x%02X, ", temp[i & 0x03]); |
| 167 | } |
| 168 | |
| 169 | pos += scnprintf(msg_buffer + pos, buf_len - pos, "\n"); |
| 170 | |
| 171 | head_idx = msm_rpm_log_read(pdata, MSM_RPM_LOG_PAGE_INDICES, |
| 172 | MSM_RPM_LOG_HEAD); |
Priyanka Mathur | 9591fff | 2012-12-13 13:07:32 -0800 | [diff] [blame] | 173 | tail_idx = msm_rpm_log_read(pdata, MSM_RPM_LOG_PAGE_INDICES, |
| 174 | MSM_RPM_LOG_TAIL); |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 175 | |
| 176 | /* roll back if message that was read is not still valid */ |
| 177 | if (tail_idx - *read_idx > tail_idx - head_idx) |
| 178 | pos = pos_start; |
| 179 | |
| 180 | *read_idx += PADDED_LENGTH(msg_len) + 4; |
| 181 | } |
| 182 | |
| 183 | return pos; |
| 184 | } |
| 185 | |
| 186 | |
| 187 | /* |
| 188 | * msm_rpm_log_file_read() - Reads in log buffer messages then outputs them to a |
| 189 | * user buffer |
| 190 | * |
| 191 | * Return value: |
| 192 | * 0: success |
| 193 | * -ENOMEM: no memory available |
| 194 | * -EINVAL: user buffer null or requested bytes 0 |
| 195 | * -EFAULT: user buffer not writeable |
| 196 | * -EAGAIN: no bytes available at the moment |
| 197 | */ |
| 198 | static ssize_t msm_rpm_log_file_read(struct file *file, char __user *bufu, |
| 199 | size_t count, loff_t *ppos) |
| 200 | { |
| 201 | u32 out_len, remaining; |
| 202 | struct msm_rpm_log_platform_data *pdata; |
| 203 | struct msm_rpm_log_buffer *buf; |
| 204 | |
| 205 | buf = file->private_data; |
| 206 | pdata = buf->pdata; |
| 207 | if (!pdata) |
| 208 | return -EINVAL; |
| 209 | if (!buf) |
| 210 | return -ENOMEM; |
| 211 | if (!buf->data) |
| 212 | return -ENOMEM; |
| 213 | if (!bufu || count < 0) |
| 214 | return -EINVAL; |
| 215 | if (!access_ok(VERIFY_WRITE, bufu, count)) |
| 216 | return -EFAULT; |
| 217 | |
| 218 | /* check for more messages if local buffer empty */ |
| 219 | if (buf->pos == buf->len) { |
| 220 | buf->pos = 0; |
| 221 | buf->len = msm_rpm_log_copy(pdata, buf->data, buf->max_len, |
| 222 | &(buf->read_idx)); |
| 223 | } |
| 224 | |
| 225 | if ((file->f_flags & O_NONBLOCK) && buf->len == 0) |
| 226 | return -EAGAIN; |
| 227 | |
| 228 | /* loop until new messages arrive */ |
| 229 | while (buf->len == 0) { |
| 230 | cond_resched(); |
| 231 | if (msleep_interruptible(RECHECK_TIME)) |
| 232 | break; |
| 233 | buf->len = msm_rpm_log_copy(pdata, buf->data, buf->max_len, |
| 234 | &(buf->read_idx)); |
| 235 | } |
| 236 | |
| 237 | out_len = ((buf->len - buf->pos) < count ? buf->len - buf->pos : count); |
| 238 | |
| 239 | remaining = __copy_to_user(bufu, &(buf->data[buf->pos]), out_len); |
| 240 | buf->pos += out_len - remaining; |
| 241 | |
| 242 | return out_len - remaining; |
| 243 | } |
| 244 | |
| 245 | |
| 246 | /* |
| 247 | * msm_rpm_log_file_open() - Allows a new reader to open the RPM log virtual |
Priyanka Mathur | 49c6080 | 2012-12-13 12:53:58 -0800 | [diff] [blame] | 248 | * file |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 249 | * |
| 250 | * One local buffer is kmalloc'ed for each reader, so no resource sharing has |
| 251 | * to take place (besides the read only access to the RPM log buffer). |
| 252 | * |
| 253 | * Return value: |
| 254 | * 0: success |
| 255 | * -ENOMEM: no memory available |
| 256 | */ |
| 257 | static int msm_rpm_log_file_open(struct inode *inode, struct file *file) |
| 258 | { |
| 259 | struct msm_rpm_log_buffer *buf; |
| 260 | struct msm_rpm_log_platform_data *pdata; |
| 261 | |
| 262 | pdata = inode->i_private; |
| 263 | if (!pdata) |
| 264 | return -EINVAL; |
| 265 | |
| 266 | file->private_data = |
| 267 | kmalloc(sizeof(struct msm_rpm_log_buffer), GFP_KERNEL); |
| 268 | if (!file->private_data) { |
| 269 | pr_err("%s: ERROR kmalloc failed to allocate %d bytes\n", |
| 270 | __func__, sizeof(struct msm_rpm_log_buffer)); |
| 271 | return -ENOMEM; |
| 272 | } |
| 273 | buf = file->private_data; |
| 274 | |
| 275 | buf->data = kmalloc(PRINTED_LENGTH(pdata->log_len), GFP_KERNEL); |
| 276 | if (!buf->data) { |
| 277 | kfree(file->private_data); |
| 278 | file->private_data = NULL; |
| 279 | pr_err("%s: ERROR kmalloc failed to allocate %d bytes\n", |
| 280 | __func__, PRINTED_LENGTH(pdata->log_len)); |
| 281 | return -ENOMEM; |
| 282 | } |
| 283 | |
| 284 | buf->pdata = pdata; |
| 285 | buf->len = 0; |
| 286 | buf->pos = 0; |
| 287 | buf->max_len = PRINTED_LENGTH(pdata->log_len); |
| 288 | buf->read_idx = msm_rpm_log_read(pdata, MSM_RPM_LOG_PAGE_INDICES, |
| 289 | MSM_RPM_LOG_HEAD); |
| 290 | return 0; |
| 291 | } |
| 292 | |
| 293 | static int msm_rpm_log_file_close(struct inode *inode, struct file *file) |
| 294 | { |
| 295 | kfree(((struct msm_rpm_log_buffer *)file->private_data)->data); |
| 296 | kfree(file->private_data); |
| 297 | return 0; |
| 298 | } |
| 299 | |
| 300 | |
| 301 | static const struct file_operations msm_rpm_log_file_fops = { |
| 302 | .owner = THIS_MODULE, |
| 303 | .open = msm_rpm_log_file_open, |
| 304 | .read = msm_rpm_log_file_read, |
| 305 | .release = msm_rpm_log_file_close, |
| 306 | }; |
| 307 | |
| 308 | static int __devinit msm_rpm_log_probe(struct platform_device *pdev) |
| 309 | { |
| 310 | struct dentry *dent; |
| 311 | struct msm_rpm_log_platform_data *pdata; |
Priyanka Mathur | 49c6080 | 2012-12-13 12:53:58 -0800 | [diff] [blame] | 312 | struct resource *res = NULL; |
| 313 | struct device_node *node = NULL; |
| 314 | phys_addr_t page_buffer_address, rpm_addr_phys; |
| 315 | int ret = 0; |
| 316 | char *key = NULL; |
| 317 | uint32_t val = 0; |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 318 | |
Priyanka Mathur | 49c6080 | 2012-12-13 12:53:58 -0800 | [diff] [blame] | 319 | node = pdev->dev.of_node; |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 320 | |
Priyanka Mathur | 49c6080 | 2012-12-13 12:53:58 -0800 | [diff] [blame] | 321 | if (node) { |
| 322 | pdata = kzalloc(sizeof(struct msm_rpm_log_platform_data), |
| 323 | GFP_KERNEL); |
| 324 | if (!pdata) |
| 325 | return -ENOMEM; |
| 326 | |
| 327 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 328 | if (!res) { |
| 329 | kfree(pdata); |
| 330 | return -EINVAL; |
| 331 | } |
| 332 | |
| 333 | pdata->phys_addr_base = res->start; |
| 334 | pdata->phys_size = resource_size(res); |
| 335 | |
| 336 | pdata->reg_base = ioremap_nocache(pdata->phys_addr_base, |
| 337 | pdata->phys_size); |
| 338 | if (!pdata->reg_base) { |
| 339 | pr_err("%s: ERROR could not ioremap: start=%p, len=%u\n", |
| 340 | __func__, (void *) pdata->phys_addr_base, |
| 341 | pdata->phys_size); |
| 342 | kfree(pdata); |
| 343 | return -EBUSY; |
| 344 | } |
| 345 | /* Read various parameters from the header if the |
| 346 | * version of the RPM Ulog is 0x1000. This version |
| 347 | * corresponds to the node in the rpm header which |
| 348 | * holds RPM log on 8974. |
| 349 | * |
| 350 | * offset-page-buffer-addr: At this offset header |
| 351 | * contains address of the location where raw log |
| 352 | * starts |
| 353 | * offset-log-len: At this offset header contains |
| 354 | * the length of the log buffer. |
| 355 | * offset-log-len-mask: At this offset header contains |
| 356 | * the log length mask for the buffer. |
| 357 | * offset-page-indices: At this offset header contains |
| 358 | * the index for writer. */ |
| 359 | |
| 360 | key = "qcom,offset-version"; |
| 361 | ret = of_property_read_u32(node, key, &val); |
| 362 | if (ret) { |
| 363 | pr_err("%s: Error in name %s key %s\n", |
| 364 | __func__, node->full_name, key); |
| 365 | ret = -EFAULT; |
| 366 | goto fail; |
| 367 | } |
| 368 | |
| 369 | pdata->version = readl_relaxed(pdata->reg_base + val); |
| 370 | if (pdata->version == VERSION_8974) { |
| 371 | key = "qcom,rpm-addr-phys"; |
| 372 | ret = of_property_read_u32(node, key, &val); |
| 373 | if (ret) { |
| 374 | pr_err("%s: Error in name %s key %s\n", |
| 375 | __func__, node->full_name, key); |
| 376 | ret = -EFAULT; |
| 377 | goto fail; |
| 378 | } |
| 379 | |
| 380 | rpm_addr_phys = val; |
| 381 | |
| 382 | key = "qcom,offset-page-buffer-addr"; |
| 383 | ret = of_property_read_u32(node, key, &val); |
| 384 | if (ret) { |
| 385 | pr_err("%s: Error in name %s key %s\n", |
| 386 | __func__, node->full_name, key); |
| 387 | ret = -EFAULT; |
| 388 | goto fail; |
| 389 | } |
| 390 | |
| 391 | page_buffer_address = rpm_addr_phys + |
| 392 | readl_relaxed(pdata->reg_base + val); |
| 393 | pdata->reg_offsets[MSM_RPM_LOG_PAGE_BUFFER] = |
| 394 | page_buffer_address - pdata->phys_addr_base; |
| 395 | |
| 396 | key = "qcom,offset-log-len"; |
| 397 | ret = of_property_read_u32(node, key, &val); |
| 398 | if (ret) { |
| 399 | pr_err("%s: Error in name %s key %s\n", |
| 400 | __func__, node->full_name, key); |
| 401 | ret = -EFAULT; |
| 402 | goto fail; |
| 403 | } |
| 404 | pdata->log_len = readl_relaxed(pdata->reg_base + val); |
| 405 | |
| 406 | if (pdata->log_len > pdata->phys_size) { |
| 407 | pr_err("%s: Error phy size: %d should be atleast log length: %d\n", |
| 408 | __func__, pdata->phys_size, |
| 409 | pdata->log_len); |
| 410 | |
| 411 | ret = -EINVAL; |
| 412 | goto fail; |
| 413 | } |
| 414 | |
| 415 | key = "qcom,offset-log-len-mask"; |
| 416 | ret = of_property_read_u32(node, key, &val); |
| 417 | if (ret) { |
| 418 | pr_err("%s: Error in name %s key %s\n", |
| 419 | __func__, node->full_name, key); |
| 420 | ret = -EFAULT; |
| 421 | goto fail; |
| 422 | } |
| 423 | pdata->log_len_mask = readl_relaxed(pdata->reg_base |
| 424 | + val); |
| 425 | |
| 426 | key = "qcom,offset-page-indices"; |
| 427 | ret = of_property_read_u32(node, key, &val); |
| 428 | if (ret) { |
| 429 | pr_err("%s: Error in name %s key %s\n", |
| 430 | __func__, node->full_name, key); |
| 431 | ret = -EFAULT; |
| 432 | goto fail; |
| 433 | } |
| 434 | pdata->reg_offsets[MSM_RPM_LOG_PAGE_INDICES] = |
| 435 | val; |
| 436 | } else{ |
| 437 | ret = -EINVAL; |
| 438 | goto fail; |
| 439 | } |
| 440 | |
| 441 | } else{ |
| 442 | pdata = pdev->dev.platform_data; |
| 443 | if (!pdata) |
| 444 | return -EINVAL; |
| 445 | |
| 446 | pdata->reg_base = ioremap(pdata->phys_addr_base, |
| 447 | pdata->phys_size); |
| 448 | if (!pdata->reg_base) { |
| 449 | pr_err("%s: ERROR could not ioremap: start=%p, len=%u\n", |
| 450 | __func__, (void *) pdata->phys_addr_base, |
| 451 | pdata->phys_size); |
| 452 | return -EBUSY; |
| 453 | } |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 454 | } |
| 455 | |
| 456 | dent = debugfs_create_file("rpm_log", S_IRUGO, NULL, |
Priyanka Mathur | 49c6080 | 2012-12-13 12:53:58 -0800 | [diff] [blame] | 457 | pdata, &msm_rpm_log_file_fops); |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 458 | if (!dent) { |
| 459 | pr_err("%s: ERROR debugfs_create_file failed\n", __func__); |
Priyanka Mathur | 49c6080 | 2012-12-13 12:53:58 -0800 | [diff] [blame] | 460 | if (pdata->version == VERSION_8974) { |
| 461 | ret = -ENOMEM; |
| 462 | goto fail; |
| 463 | } |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 464 | return -ENOMEM; |
| 465 | } |
| 466 | |
| 467 | platform_set_drvdata(pdev, dent); |
| 468 | |
| 469 | pr_notice("%s: OK\n", __func__); |
| 470 | return 0; |
Priyanka Mathur | 49c6080 | 2012-12-13 12:53:58 -0800 | [diff] [blame] | 471 | |
| 472 | fail: |
| 473 | iounmap(pdata->reg_base); |
| 474 | kfree(pdata); |
| 475 | return ret; |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 476 | } |
| 477 | |
| 478 | static int __devexit msm_rpm_log_remove(struct platform_device *pdev) |
| 479 | { |
| 480 | struct dentry *dent; |
| 481 | struct msm_rpm_log_platform_data *pdata; |
| 482 | |
| 483 | pdata = pdev->dev.platform_data; |
| 484 | |
| 485 | iounmap(pdata->reg_base); |
| 486 | |
| 487 | dent = platform_get_drvdata(pdev); |
| 488 | debugfs_remove(dent); |
| 489 | platform_set_drvdata(pdev, NULL); |
| 490 | |
| 491 | pr_notice("%s: OK\n", __func__); |
| 492 | return 0; |
| 493 | } |
| 494 | |
Priyanka Mathur | 49c6080 | 2012-12-13 12:53:58 -0800 | [diff] [blame] | 495 | static struct of_device_id rpm_log_table[] = { |
| 496 | {.compatible = "qcom,rpm-log"}, |
| 497 | {}, |
| 498 | }; |
| 499 | |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 500 | static struct platform_driver msm_rpm_log_driver = { |
| 501 | .probe = msm_rpm_log_probe, |
| 502 | .remove = __devexit_p(msm_rpm_log_remove), |
| 503 | .driver = { |
| 504 | .name = "msm_rpm_log", |
| 505 | .owner = THIS_MODULE, |
Priyanka Mathur | 49c6080 | 2012-12-13 12:53:58 -0800 | [diff] [blame] | 506 | .of_match_table = rpm_log_table, |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 507 | }, |
| 508 | }; |
| 509 | |
| 510 | static int __init msm_rpm_log_init(void) |
| 511 | { |
| 512 | return platform_driver_register(&msm_rpm_log_driver); |
| 513 | } |
| 514 | |
| 515 | static void __exit msm_rpm_log_exit(void) |
| 516 | { |
| 517 | platform_driver_unregister(&msm_rpm_log_driver); |
| 518 | } |
| 519 | |
| 520 | module_init(msm_rpm_log_init); |
| 521 | module_exit(msm_rpm_log_exit); |
| 522 | |
| 523 | MODULE_LICENSE("GPL v2"); |
| 524 | MODULE_DESCRIPTION("MSM RPM Log driver"); |
| 525 | MODULE_VERSION("1.0"); |
| 526 | MODULE_ALIAS("platform:msm_rpm_log"); |