Jonathan Cameron | 847ec80 | 2009-08-18 18:06:19 +0100 | [diff] [blame] | 1 | /* The industrial I/O core |
| 2 | * |
| 3 | * Copyright (c) 2008 Jonathan Cameron |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 as published by |
| 7 | * the Free Software Foundation. |
| 8 | * |
| 9 | * Based on elements of hwmon and input subsystems. |
| 10 | */ |
| 11 | |
| 12 | #include <linux/kernel.h> |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/idr.h> |
| 15 | #include <linux/kdev_t.h> |
| 16 | #include <linux/err.h> |
| 17 | #include <linux/device.h> |
| 18 | #include <linux/fs.h> |
Jonathan Cameron | 847ec80 | 2009-08-18 18:06:19 +0100 | [diff] [blame] | 19 | #include <linux/poll.h> |
Jonathan Cameron | ffc18af | 2009-10-12 19:18:09 +0100 | [diff] [blame] | 20 | #include <linux/sched.h> |
Jeff Mahoney | 4439c93 | 2009-10-12 17:10:34 -0400 | [diff] [blame] | 21 | #include <linux/wait.h> |
Jonathan Cameron | 847ec80 | 2009-08-18 18:06:19 +0100 | [diff] [blame] | 22 | #include <linux/cdev.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 23 | #include <linux/slab.h> |
Jonathan Cameron | 8e7d967 | 2011-08-30 12:32:45 +0100 | [diff] [blame] | 24 | #include <linux/anon_inodes.h> |
Michael Hennerich | e553f18 | 2012-03-01 10:51:03 +0100 | [diff] [blame] | 25 | #include <linux/debugfs.h> |
Jonathan Cameron | 06458e2 | 2012-04-25 15:54:58 +0100 | [diff] [blame] | 26 | #include <linux/iio/iio.h> |
Jonathan Cameron | df9c1c4 | 2011-08-12 17:56:03 +0100 | [diff] [blame] | 27 | #include "iio_core.h" |
Jonathan Cameron | 6aea1c3 | 2011-08-24 17:28:38 +0100 | [diff] [blame] | 28 | #include "iio_core_trigger.h" |
Jonathan Cameron | 06458e2 | 2012-04-25 15:54:58 +0100 | [diff] [blame] | 29 | #include <linux/iio/sysfs.h> |
| 30 | #include <linux/iio/events.h> |
Jonathan Cameron | 9dd1cb3 | 2011-08-30 12:41:15 +0100 | [diff] [blame] | 31 | |
Jonathan Cameron | 47c24fd | 2011-08-30 12:41:07 +0100 | [diff] [blame] | 32 | /* IDA to assign each registered device a unique id*/ |
Jonathan Cameron | b156cf7 | 2010-09-04 17:54:43 +0100 | [diff] [blame] | 33 | static DEFINE_IDA(iio_ida); |
Jonathan Cameron | 847ec80 | 2009-08-18 18:06:19 +0100 | [diff] [blame] | 34 | |
Jonathan Cameron | f625cb9 | 2011-08-30 12:32:48 +0100 | [diff] [blame] | 35 | static dev_t iio_devt; |
Jonathan Cameron | 847ec80 | 2009-08-18 18:06:19 +0100 | [diff] [blame] | 36 | |
| 37 | #define IIO_DEV_MAX 256 |
Jonathan Cameron | 5aaaeba | 2010-05-04 14:43:00 +0100 | [diff] [blame] | 38 | struct bus_type iio_bus_type = { |
Jonathan Cameron | 847ec80 | 2009-08-18 18:06:19 +0100 | [diff] [blame] | 39 | .name = "iio", |
Jonathan Cameron | 847ec80 | 2009-08-18 18:06:19 +0100 | [diff] [blame] | 40 | }; |
Jonathan Cameron | 5aaaeba | 2010-05-04 14:43:00 +0100 | [diff] [blame] | 41 | EXPORT_SYMBOL(iio_bus_type); |
Jonathan Cameron | 847ec80 | 2009-08-18 18:06:19 +0100 | [diff] [blame] | 42 | |
Michael Hennerich | e553f18 | 2012-03-01 10:51:03 +0100 | [diff] [blame] | 43 | static struct dentry *iio_debugfs_dentry; |
| 44 | |
Jonathan Cameron | c6fc806 | 2011-09-02 17:14:34 +0100 | [diff] [blame] | 45 | static const char * const iio_direction[] = { |
| 46 | [0] = "in", |
| 47 | [1] = "out", |
| 48 | }; |
| 49 | |
Jonathan Cameron | ade7ef7 | 2011-09-02 17:14:45 +0100 | [diff] [blame] | 50 | static const char * const iio_chan_type_name_spec[] = { |
Jonathan Cameron | c6fc806 | 2011-09-02 17:14:34 +0100 | [diff] [blame] | 51 | [IIO_VOLTAGE] = "voltage", |
Michael Hennerich | faf290e | 2011-05-18 14:42:02 +0100 | [diff] [blame] | 52 | [IIO_CURRENT] = "current", |
| 53 | [IIO_POWER] = "power", |
Bryan Freed | 9bff02f | 2011-07-07 12:01:54 -0700 | [diff] [blame] | 54 | [IIO_ACCEL] = "accel", |
Jonathan Cameron | 41ea040 | 2011-10-05 15:27:59 +0100 | [diff] [blame] | 55 | [IIO_ANGL_VEL] = "anglvel", |
Jonathan Cameron | 1d89271 | 2011-05-18 14:40:51 +0100 | [diff] [blame] | 56 | [IIO_MAGN] = "magn", |
Bryan Freed | 9bff02f | 2011-07-07 12:01:54 -0700 | [diff] [blame] | 57 | [IIO_LIGHT] = "illuminance", |
| 58 | [IIO_INTENSITY] = "intensity", |
Bryan Freed | f09f2c8 | 2011-07-07 12:01:55 -0700 | [diff] [blame] | 59 | [IIO_PROXIMITY] = "proximity", |
Bryan Freed | 9bff02f | 2011-07-07 12:01:54 -0700 | [diff] [blame] | 60 | [IIO_TEMP] = "temp", |
Jonathan Cameron | 1d89271 | 2011-05-18 14:40:51 +0100 | [diff] [blame] | 61 | [IIO_INCLI] = "incli", |
| 62 | [IIO_ROT] = "rot", |
Jonathan Cameron | 1d89271 | 2011-05-18 14:40:51 +0100 | [diff] [blame] | 63 | [IIO_ANGL] = "angl", |
Bryan Freed | 9bff02f | 2011-07-07 12:01:54 -0700 | [diff] [blame] | 64 | [IIO_TIMESTAMP] = "timestamp", |
Jonathan Cameron | 66dbe70 | 2011-09-02 17:14:43 +0100 | [diff] [blame] | 65 | [IIO_CAPACITANCE] = "capacitance", |
Michael Hennerich | a6b1285 | 2012-04-27 10:58:34 +0200 | [diff] [blame^] | 66 | [IIO_ALTVOLTAGE] = "altvoltage", |
Jonathan Cameron | 1d89271 | 2011-05-18 14:40:51 +0100 | [diff] [blame] | 67 | }; |
| 68 | |
Jonathan Cameron | 330c6c5 | 2011-09-02 17:14:39 +0100 | [diff] [blame] | 69 | static const char * const iio_modifier_names[] = { |
Jonathan Cameron | 1d89271 | 2011-05-18 14:40:51 +0100 | [diff] [blame] | 70 | [IIO_MOD_X] = "x", |
| 71 | [IIO_MOD_Y] = "y", |
| 72 | [IIO_MOD_Z] = "z", |
Jonathan Cameron | 330c6c5 | 2011-09-02 17:14:39 +0100 | [diff] [blame] | 73 | [IIO_MOD_LIGHT_BOTH] = "both", |
| 74 | [IIO_MOD_LIGHT_IR] = "ir", |
Jonathan Cameron | 1d89271 | 2011-05-18 14:40:51 +0100 | [diff] [blame] | 75 | }; |
| 76 | |
| 77 | /* relies on pairs of these shared then separate */ |
| 78 | static const char * const iio_chan_info_postfix[] = { |
Jonathan Cameron | 75a973c | 2012-04-15 17:41:30 +0100 | [diff] [blame] | 79 | [IIO_CHAN_INFO_RAW] = "raw", |
| 80 | [IIO_CHAN_INFO_PROCESSED] = "input", |
Jonathan Cameron | c8a9f80 | 2011-10-26 17:41:36 +0100 | [diff] [blame] | 81 | [IIO_CHAN_INFO_SCALE] = "scale", |
| 82 | [IIO_CHAN_INFO_OFFSET] = "offset", |
| 83 | [IIO_CHAN_INFO_CALIBSCALE] = "calibscale", |
| 84 | [IIO_CHAN_INFO_CALIBBIAS] = "calibbias", |
| 85 | [IIO_CHAN_INFO_PEAK] = "peak_raw", |
| 86 | [IIO_CHAN_INFO_PEAK_SCALE] = "peak_scale", |
| 87 | [IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW] = "quadrature_correction_raw", |
| 88 | [IIO_CHAN_INFO_AVERAGE_RAW] = "mean_raw", |
Jonathan Cameron | df94aba | 2011-11-27 11:39:12 +0000 | [diff] [blame] | 89 | [IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY] |
| 90 | = "filter_low_pass_3db_frequency", |
Laxman Dewangan | ce85a1c | 2012-04-13 16:03:31 +0530 | [diff] [blame] | 91 | [IIO_CHAN_INFO_SAMP_FREQ] = "sampling_frequency", |
Michael Hennerich | a6b1285 | 2012-04-27 10:58:34 +0200 | [diff] [blame^] | 92 | [IIO_CHAN_INFO_FREQUENCY] = "frequency", |
| 93 | [IIO_CHAN_INFO_PHASE] = "phase", |
Jonathan Cameron | 1d89271 | 2011-05-18 14:40:51 +0100 | [diff] [blame] | 94 | }; |
| 95 | |
Jonathan Cameron | 5fb21c8 | 2011-12-05 21:37:10 +0000 | [diff] [blame] | 96 | const struct iio_chan_spec |
| 97 | *iio_find_channel_from_si(struct iio_dev *indio_dev, int si) |
| 98 | { |
| 99 | int i; |
| 100 | |
| 101 | for (i = 0; i < indio_dev->num_channels; i++) |
| 102 | if (indio_dev->channels[i].scan_index == si) |
| 103 | return &indio_dev->channels[i]; |
| 104 | return NULL; |
| 105 | } |
| 106 | |
Jonathan Cameron | 847ec80 | 2009-08-18 18:06:19 +0100 | [diff] [blame] | 107 | /* This turns up an awful lot */ |
| 108 | ssize_t iio_read_const_attr(struct device *dev, |
| 109 | struct device_attribute *attr, |
| 110 | char *buf) |
| 111 | { |
| 112 | return sprintf(buf, "%s\n", to_iio_const_attr(attr)->string); |
| 113 | } |
| 114 | EXPORT_SYMBOL(iio_read_const_attr); |
| 115 | |
Jonathan Cameron | 847ec80 | 2009-08-18 18:06:19 +0100 | [diff] [blame] | 116 | static int __init iio_init(void) |
| 117 | { |
| 118 | int ret; |
| 119 | |
Jonathan Cameron | 5aaaeba | 2010-05-04 14:43:00 +0100 | [diff] [blame] | 120 | /* Register sysfs bus */ |
| 121 | ret = bus_register(&iio_bus_type); |
Jonathan Cameron | 847ec80 | 2009-08-18 18:06:19 +0100 | [diff] [blame] | 122 | if (ret < 0) { |
| 123 | printk(KERN_ERR |
Jonathan Cameron | 5aaaeba | 2010-05-04 14:43:00 +0100 | [diff] [blame] | 124 | "%s could not register bus type\n", |
Jonathan Cameron | 847ec80 | 2009-08-18 18:06:19 +0100 | [diff] [blame] | 125 | __FILE__); |
| 126 | goto error_nothing; |
| 127 | } |
| 128 | |
Jonathan Cameron | 9aa1a16 | 2011-08-12 17:08:50 +0100 | [diff] [blame] | 129 | ret = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio"); |
| 130 | if (ret < 0) { |
| 131 | printk(KERN_ERR "%s: failed to allocate char dev region\n", |
| 132 | __FILE__); |
Jonathan Cameron | 5aaaeba | 2010-05-04 14:43:00 +0100 | [diff] [blame] | 133 | goto error_unregister_bus_type; |
Jonathan Cameron | 9aa1a16 | 2011-08-12 17:08:50 +0100 | [diff] [blame] | 134 | } |
Jonathan Cameron | 847ec80 | 2009-08-18 18:06:19 +0100 | [diff] [blame] | 135 | |
Michael Hennerich | e553f18 | 2012-03-01 10:51:03 +0100 | [diff] [blame] | 136 | iio_debugfs_dentry = debugfs_create_dir("iio", NULL); |
| 137 | |
Jonathan Cameron | 847ec80 | 2009-08-18 18:06:19 +0100 | [diff] [blame] | 138 | return 0; |
| 139 | |
Jonathan Cameron | 5aaaeba | 2010-05-04 14:43:00 +0100 | [diff] [blame] | 140 | error_unregister_bus_type: |
| 141 | bus_unregister(&iio_bus_type); |
Jonathan Cameron | 847ec80 | 2009-08-18 18:06:19 +0100 | [diff] [blame] | 142 | error_nothing: |
| 143 | return ret; |
| 144 | } |
| 145 | |
| 146 | static void __exit iio_exit(void) |
| 147 | { |
Jonathan Cameron | 9aa1a16 | 2011-08-12 17:08:50 +0100 | [diff] [blame] | 148 | if (iio_devt) |
| 149 | unregister_chrdev_region(iio_devt, IIO_DEV_MAX); |
Jonathan Cameron | 5aaaeba | 2010-05-04 14:43:00 +0100 | [diff] [blame] | 150 | bus_unregister(&iio_bus_type); |
Michael Hennerich | e553f18 | 2012-03-01 10:51:03 +0100 | [diff] [blame] | 151 | debugfs_remove(iio_debugfs_dentry); |
| 152 | } |
| 153 | |
| 154 | #if defined(CONFIG_DEBUG_FS) |
| 155 | static int iio_debugfs_open(struct inode *inode, struct file *file) |
| 156 | { |
| 157 | if (inode->i_private) |
| 158 | file->private_data = inode->i_private; |
| 159 | |
| 160 | return 0; |
| 161 | } |
| 162 | |
| 163 | static ssize_t iio_debugfs_read_reg(struct file *file, char __user *userbuf, |
| 164 | size_t count, loff_t *ppos) |
| 165 | { |
| 166 | struct iio_dev *indio_dev = file->private_data; |
| 167 | char buf[20]; |
| 168 | unsigned val = 0; |
| 169 | ssize_t len; |
| 170 | int ret; |
| 171 | |
| 172 | ret = indio_dev->info->debugfs_reg_access(indio_dev, |
| 173 | indio_dev->cached_reg_addr, |
| 174 | 0, &val); |
| 175 | if (ret) |
| 176 | dev_err(indio_dev->dev.parent, "%s: read failed\n", __func__); |
| 177 | |
| 178 | len = snprintf(buf, sizeof(buf), "0x%X\n", val); |
| 179 | |
| 180 | return simple_read_from_buffer(userbuf, count, ppos, buf, len); |
| 181 | } |
| 182 | |
| 183 | static ssize_t iio_debugfs_write_reg(struct file *file, |
| 184 | const char __user *userbuf, size_t count, loff_t *ppos) |
| 185 | { |
| 186 | struct iio_dev *indio_dev = file->private_data; |
| 187 | unsigned reg, val; |
| 188 | char buf[80]; |
| 189 | int ret; |
| 190 | |
| 191 | count = min_t(size_t, count, (sizeof(buf)-1)); |
| 192 | if (copy_from_user(buf, userbuf, count)) |
| 193 | return -EFAULT; |
| 194 | |
| 195 | buf[count] = 0; |
| 196 | |
| 197 | ret = sscanf(buf, "%i %i", ®, &val); |
| 198 | |
| 199 | switch (ret) { |
| 200 | case 1: |
| 201 | indio_dev->cached_reg_addr = reg; |
| 202 | break; |
| 203 | case 2: |
| 204 | indio_dev->cached_reg_addr = reg; |
| 205 | ret = indio_dev->info->debugfs_reg_access(indio_dev, reg, |
| 206 | val, NULL); |
| 207 | if (ret) { |
| 208 | dev_err(indio_dev->dev.parent, "%s: write failed\n", |
| 209 | __func__); |
| 210 | return ret; |
| 211 | } |
| 212 | break; |
| 213 | default: |
| 214 | return -EINVAL; |
| 215 | } |
| 216 | |
| 217 | return count; |
| 218 | } |
| 219 | |
| 220 | static const struct file_operations iio_debugfs_reg_fops = { |
| 221 | .open = iio_debugfs_open, |
| 222 | .read = iio_debugfs_read_reg, |
| 223 | .write = iio_debugfs_write_reg, |
| 224 | }; |
| 225 | |
| 226 | static void iio_device_unregister_debugfs(struct iio_dev *indio_dev) |
| 227 | { |
| 228 | debugfs_remove_recursive(indio_dev->debugfs_dentry); |
Jonathan Cameron | 847ec80 | 2009-08-18 18:06:19 +0100 | [diff] [blame] | 229 | } |
| 230 | |
Michael Hennerich | e553f18 | 2012-03-01 10:51:03 +0100 | [diff] [blame] | 231 | static int iio_device_register_debugfs(struct iio_dev *indio_dev) |
| 232 | { |
| 233 | struct dentry *d; |
| 234 | |
| 235 | if (indio_dev->info->debugfs_reg_access == NULL) |
| 236 | return 0; |
| 237 | |
| 238 | if (IS_ERR(iio_debugfs_dentry)) |
| 239 | return 0; |
| 240 | |
| 241 | indio_dev->debugfs_dentry = |
| 242 | debugfs_create_dir(dev_name(&indio_dev->dev), |
| 243 | iio_debugfs_dentry); |
| 244 | if (IS_ERR(indio_dev->debugfs_dentry)) |
| 245 | return PTR_ERR(indio_dev->debugfs_dentry); |
| 246 | |
| 247 | if (indio_dev->debugfs_dentry == NULL) { |
| 248 | dev_warn(indio_dev->dev.parent, |
| 249 | "Failed to create debugfs directory\n"); |
| 250 | return -EFAULT; |
| 251 | } |
| 252 | |
| 253 | d = debugfs_create_file("direct_reg_access", 0644, |
| 254 | indio_dev->debugfs_dentry, |
| 255 | indio_dev, &iio_debugfs_reg_fops); |
| 256 | if (!d) { |
| 257 | iio_device_unregister_debugfs(indio_dev); |
| 258 | return -ENOMEM; |
| 259 | } |
| 260 | |
| 261 | return 0; |
| 262 | } |
| 263 | #else |
| 264 | static int iio_device_register_debugfs(struct iio_dev *indio_dev) |
| 265 | { |
| 266 | return 0; |
| 267 | } |
| 268 | |
| 269 | static void iio_device_unregister_debugfs(struct iio_dev *indio_dev) |
| 270 | { |
| 271 | } |
| 272 | #endif /* CONFIG_DEBUG_FS */ |
| 273 | |
Lars-Peter Clausen | 4fee7e1 | 2012-03-06 20:43:45 +0100 | [diff] [blame] | 274 | static ssize_t iio_read_channel_ext_info(struct device *dev, |
| 275 | struct device_attribute *attr, |
| 276 | char *buf) |
| 277 | { |
| 278 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| 279 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
| 280 | const struct iio_chan_spec_ext_info *ext_info; |
| 281 | |
| 282 | ext_info = &this_attr->c->ext_info[this_attr->address]; |
| 283 | |
| 284 | return ext_info->read(indio_dev, this_attr->c, buf); |
| 285 | } |
| 286 | |
| 287 | static ssize_t iio_write_channel_ext_info(struct device *dev, |
| 288 | struct device_attribute *attr, |
| 289 | const char *buf, |
| 290 | size_t len) |
| 291 | { |
| 292 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| 293 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
| 294 | const struct iio_chan_spec_ext_info *ext_info; |
| 295 | |
| 296 | ext_info = &this_attr->c->ext_info[this_attr->address]; |
| 297 | |
| 298 | return ext_info->write(indio_dev, this_attr->c, buf, len); |
| 299 | } |
| 300 | |
Jonathan Cameron | 1d89271 | 2011-05-18 14:40:51 +0100 | [diff] [blame] | 301 | static ssize_t iio_read_channel_info(struct device *dev, |
| 302 | struct device_attribute *attr, |
| 303 | char *buf) |
Jonathan Cameron | 847ec80 | 2009-08-18 18:06:19 +0100 | [diff] [blame] | 304 | { |
Jonathan Cameron | 1d89271 | 2011-05-18 14:40:51 +0100 | [diff] [blame] | 305 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| 306 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
| 307 | int val, val2; |
Jonathan Cameron | 6fe8135 | 2011-05-18 14:42:37 +0100 | [diff] [blame] | 308 | int ret = indio_dev->info->read_raw(indio_dev, this_attr->c, |
| 309 | &val, &val2, this_attr->address); |
Jonathan Cameron | 847ec80 | 2009-08-18 18:06:19 +0100 | [diff] [blame] | 310 | |
Jonathan Cameron | 1d89271 | 2011-05-18 14:40:51 +0100 | [diff] [blame] | 311 | if (ret < 0) |
| 312 | return ret; |
| 313 | |
| 314 | if (ret == IIO_VAL_INT) |
| 315 | return sprintf(buf, "%d\n", val); |
| 316 | else if (ret == IIO_VAL_INT_PLUS_MICRO) { |
| 317 | if (val2 < 0) |
| 318 | return sprintf(buf, "-%d.%06u\n", val, -val2); |
| 319 | else |
| 320 | return sprintf(buf, "%d.%06u\n", val, val2); |
Michael Hennerich | 71646e2 | 2011-06-27 13:07:07 +0100 | [diff] [blame] | 321 | } else if (ret == IIO_VAL_INT_PLUS_NANO) { |
| 322 | if (val2 < 0) |
| 323 | return sprintf(buf, "-%d.%09u\n", val, -val2); |
| 324 | else |
| 325 | return sprintf(buf, "%d.%09u\n", val, val2); |
Jonathan Cameron | 1d89271 | 2011-05-18 14:40:51 +0100 | [diff] [blame] | 326 | } else |
| 327 | return 0; |
| 328 | } |
| 329 | |
| 330 | static ssize_t iio_write_channel_info(struct device *dev, |
| 331 | struct device_attribute *attr, |
| 332 | const char *buf, |
| 333 | size_t len) |
| 334 | { |
| 335 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| 336 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
Michael Hennerich | 5c04af0 | 2011-06-27 13:07:10 +0100 | [diff] [blame] | 337 | int ret, integer = 0, fract = 0, fract_mult = 100000; |
Jonathan Cameron | 1d89271 | 2011-05-18 14:40:51 +0100 | [diff] [blame] | 338 | bool integer_part = true, negative = false; |
| 339 | |
| 340 | /* Assumes decimal - precision based on number of digits */ |
Jonathan Cameron | 6fe8135 | 2011-05-18 14:42:37 +0100 | [diff] [blame] | 341 | if (!indio_dev->info->write_raw) |
Jonathan Cameron | 1d89271 | 2011-05-18 14:40:51 +0100 | [diff] [blame] | 342 | return -EINVAL; |
Michael Hennerich | 5c04af0 | 2011-06-27 13:07:10 +0100 | [diff] [blame] | 343 | |
| 344 | if (indio_dev->info->write_raw_get_fmt) |
| 345 | switch (indio_dev->info->write_raw_get_fmt(indio_dev, |
| 346 | this_attr->c, this_attr->address)) { |
| 347 | case IIO_VAL_INT_PLUS_MICRO: |
| 348 | fract_mult = 100000; |
| 349 | break; |
| 350 | case IIO_VAL_INT_PLUS_NANO: |
| 351 | fract_mult = 100000000; |
| 352 | break; |
| 353 | default: |
| 354 | return -EINVAL; |
| 355 | } |
| 356 | |
Jonathan Cameron | 1d89271 | 2011-05-18 14:40:51 +0100 | [diff] [blame] | 357 | if (buf[0] == '-') { |
| 358 | negative = true; |
| 359 | buf++; |
| 360 | } |
Michael Hennerich | 5c04af0 | 2011-06-27 13:07:10 +0100 | [diff] [blame] | 361 | |
Jonathan Cameron | 1d89271 | 2011-05-18 14:40:51 +0100 | [diff] [blame] | 362 | while (*buf) { |
| 363 | if ('0' <= *buf && *buf <= '9') { |
| 364 | if (integer_part) |
| 365 | integer = integer*10 + *buf - '0'; |
| 366 | else { |
Michael Hennerich | 5c04af0 | 2011-06-27 13:07:10 +0100 | [diff] [blame] | 367 | fract += fract_mult*(*buf - '0'); |
| 368 | if (fract_mult == 1) |
Jonathan Cameron | 1d89271 | 2011-05-18 14:40:51 +0100 | [diff] [blame] | 369 | break; |
Michael Hennerich | 5c04af0 | 2011-06-27 13:07:10 +0100 | [diff] [blame] | 370 | fract_mult /= 10; |
Jonathan Cameron | 1d89271 | 2011-05-18 14:40:51 +0100 | [diff] [blame] | 371 | } |
| 372 | } else if (*buf == '\n') { |
| 373 | if (*(buf + 1) == '\0') |
| 374 | break; |
| 375 | else |
| 376 | return -EINVAL; |
| 377 | } else if (*buf == '.') { |
| 378 | integer_part = false; |
| 379 | } else { |
| 380 | return -EINVAL; |
| 381 | } |
| 382 | buf++; |
| 383 | } |
| 384 | if (negative) { |
| 385 | if (integer) |
| 386 | integer = -integer; |
| 387 | else |
Michael Hennerich | 5c04af0 | 2011-06-27 13:07:10 +0100 | [diff] [blame] | 388 | fract = -fract; |
Jonathan Cameron | 847ec80 | 2009-08-18 18:06:19 +0100 | [diff] [blame] | 389 | } |
| 390 | |
Jonathan Cameron | 6fe8135 | 2011-05-18 14:42:37 +0100 | [diff] [blame] | 391 | ret = indio_dev->info->write_raw(indio_dev, this_attr->c, |
Michael Hennerich | 5c04af0 | 2011-06-27 13:07:10 +0100 | [diff] [blame] | 392 | integer, fract, this_attr->address); |
Jonathan Cameron | 1d89271 | 2011-05-18 14:40:51 +0100 | [diff] [blame] | 393 | if (ret) |
| 394 | return ret; |
| 395 | |
| 396 | return len; |
| 397 | } |
| 398 | |
Jonathan Cameron | df9c1c4 | 2011-08-12 17:56:03 +0100 | [diff] [blame] | 399 | static |
Jonathan Cameron | 1d89271 | 2011-05-18 14:40:51 +0100 | [diff] [blame] | 400 | int __iio_device_attr_init(struct device_attribute *dev_attr, |
| 401 | const char *postfix, |
| 402 | struct iio_chan_spec const *chan, |
| 403 | ssize_t (*readfunc)(struct device *dev, |
| 404 | struct device_attribute *attr, |
| 405 | char *buf), |
| 406 | ssize_t (*writefunc)(struct device *dev, |
| 407 | struct device_attribute *attr, |
| 408 | const char *buf, |
| 409 | size_t len), |
| 410 | bool generic) |
| 411 | { |
| 412 | int ret; |
| 413 | char *name_format, *full_postfix; |
| 414 | sysfs_attr_init(&dev_attr->attr); |
Jonathan Cameron | ade7ef7 | 2011-09-02 17:14:45 +0100 | [diff] [blame] | 415 | |
| 416 | /* Build up postfix of <extend_name>_<modifier>_postfix */ |
Jonathan Cameron | 0403e0d | 2011-10-26 17:27:42 +0100 | [diff] [blame] | 417 | if (chan->modified && !generic) { |
Jonathan Cameron | ade7ef7 | 2011-09-02 17:14:45 +0100 | [diff] [blame] | 418 | if (chan->extend_name) |
| 419 | full_postfix = kasprintf(GFP_KERNEL, "%s_%s_%s", |
| 420 | iio_modifier_names[chan |
| 421 | ->channel2], |
| 422 | chan->extend_name, |
| 423 | postfix); |
| 424 | else |
| 425 | full_postfix = kasprintf(GFP_KERNEL, "%s_%s", |
| 426 | iio_modifier_names[chan |
| 427 | ->channel2], |
| 428 | postfix); |
| 429 | } else { |
| 430 | if (chan->extend_name == NULL) |
| 431 | full_postfix = kstrdup(postfix, GFP_KERNEL); |
| 432 | else |
| 433 | full_postfix = kasprintf(GFP_KERNEL, |
| 434 | "%s_%s", |
| 435 | chan->extend_name, |
| 436 | postfix); |
| 437 | } |
| 438 | if (full_postfix == NULL) { |
| 439 | ret = -ENOMEM; |
Jonathan Cameron | 1d89271 | 2011-05-18 14:40:51 +0100 | [diff] [blame] | 440 | goto error_ret; |
Jonathan Cameron | ade7ef7 | 2011-09-02 17:14:45 +0100 | [diff] [blame] | 441 | } |
Jonathan Cameron | 1d89271 | 2011-05-18 14:40:51 +0100 | [diff] [blame] | 442 | |
Justin P. Mattock | 4abf6f8 | 2012-02-29 22:00:38 -0800 | [diff] [blame] | 443 | if (chan->differential) { /* Differential can not have modifier */ |
Jonathan Cameron | ade7ef7 | 2011-09-02 17:14:45 +0100 | [diff] [blame] | 444 | if (generic) |
| 445 | name_format |
| 446 | = kasprintf(GFP_KERNEL, "%s_%s-%s_%s", |
| 447 | iio_direction[chan->output], |
| 448 | iio_chan_type_name_spec[chan->type], |
| 449 | iio_chan_type_name_spec[chan->type], |
| 450 | full_postfix); |
| 451 | else if (chan->indexed) |
| 452 | name_format |
| 453 | = kasprintf(GFP_KERNEL, "%s_%s%d-%s%d_%s", |
| 454 | iio_direction[chan->output], |
| 455 | iio_chan_type_name_spec[chan->type], |
| 456 | chan->channel, |
| 457 | iio_chan_type_name_spec[chan->type], |
| 458 | chan->channel2, |
| 459 | full_postfix); |
| 460 | else { |
| 461 | WARN_ON("Differential channels must be indexed\n"); |
| 462 | ret = -EINVAL; |
| 463 | goto error_free_full_postfix; |
| 464 | } |
| 465 | } else { /* Single ended */ |
| 466 | if (generic) |
| 467 | name_format |
| 468 | = kasprintf(GFP_KERNEL, "%s_%s_%s", |
| 469 | iio_direction[chan->output], |
| 470 | iio_chan_type_name_spec[chan->type], |
| 471 | full_postfix); |
| 472 | else if (chan->indexed) |
| 473 | name_format |
| 474 | = kasprintf(GFP_KERNEL, "%s_%s%d_%s", |
| 475 | iio_direction[chan->output], |
| 476 | iio_chan_type_name_spec[chan->type], |
| 477 | chan->channel, |
| 478 | full_postfix); |
| 479 | else |
| 480 | name_format |
| 481 | = kasprintf(GFP_KERNEL, "%s_%s_%s", |
| 482 | iio_direction[chan->output], |
| 483 | iio_chan_type_name_spec[chan->type], |
| 484 | full_postfix); |
| 485 | } |
Jonathan Cameron | 1d89271 | 2011-05-18 14:40:51 +0100 | [diff] [blame] | 486 | if (name_format == NULL) { |
| 487 | ret = -ENOMEM; |
| 488 | goto error_free_full_postfix; |
| 489 | } |
| 490 | dev_attr->attr.name = kasprintf(GFP_KERNEL, |
| 491 | name_format, |
| 492 | chan->channel, |
| 493 | chan->channel2); |
| 494 | if (dev_attr->attr.name == NULL) { |
| 495 | ret = -ENOMEM; |
| 496 | goto error_free_name_format; |
| 497 | } |
| 498 | |
| 499 | if (readfunc) { |
| 500 | dev_attr->attr.mode |= S_IRUGO; |
| 501 | dev_attr->show = readfunc; |
| 502 | } |
| 503 | |
| 504 | if (writefunc) { |
| 505 | dev_attr->attr.mode |= S_IWUSR; |
| 506 | dev_attr->store = writefunc; |
| 507 | } |
| 508 | kfree(name_format); |
| 509 | kfree(full_postfix); |
| 510 | |
| 511 | return 0; |
| 512 | |
| 513 | error_free_name_format: |
| 514 | kfree(name_format); |
| 515 | error_free_full_postfix: |
| 516 | kfree(full_postfix); |
Jonathan Cameron | 847ec80 | 2009-08-18 18:06:19 +0100 | [diff] [blame] | 517 | error_ret: |
| 518 | return ret; |
| 519 | } |
| 520 | |
Jonathan Cameron | df9c1c4 | 2011-08-12 17:56:03 +0100 | [diff] [blame] | 521 | static void __iio_device_attr_deinit(struct device_attribute *dev_attr) |
Jonathan Cameron | 1d89271 | 2011-05-18 14:40:51 +0100 | [diff] [blame] | 522 | { |
| 523 | kfree(dev_attr->attr.name); |
| 524 | } |
| 525 | |
| 526 | int __iio_add_chan_devattr(const char *postfix, |
Jonathan Cameron | 1d89271 | 2011-05-18 14:40:51 +0100 | [diff] [blame] | 527 | struct iio_chan_spec const *chan, |
| 528 | ssize_t (*readfunc)(struct device *dev, |
| 529 | struct device_attribute *attr, |
| 530 | char *buf), |
| 531 | ssize_t (*writefunc)(struct device *dev, |
| 532 | struct device_attribute *attr, |
| 533 | const char *buf, |
| 534 | size_t len), |
Jonathan Cameron | e614a54 | 2011-09-02 17:14:41 +0100 | [diff] [blame] | 535 | u64 mask, |
Jonathan Cameron | 1d89271 | 2011-05-18 14:40:51 +0100 | [diff] [blame] | 536 | bool generic, |
| 537 | struct device *dev, |
| 538 | struct list_head *attr_list) |
| 539 | { |
| 540 | int ret; |
| 541 | struct iio_dev_attr *iio_attr, *t; |
| 542 | |
| 543 | iio_attr = kzalloc(sizeof *iio_attr, GFP_KERNEL); |
| 544 | if (iio_attr == NULL) { |
| 545 | ret = -ENOMEM; |
| 546 | goto error_ret; |
| 547 | } |
| 548 | ret = __iio_device_attr_init(&iio_attr->dev_attr, |
| 549 | postfix, chan, |
| 550 | readfunc, writefunc, generic); |
| 551 | if (ret) |
| 552 | goto error_iio_dev_attr_free; |
| 553 | iio_attr->c = chan; |
| 554 | iio_attr->address = mask; |
| 555 | list_for_each_entry(t, attr_list, l) |
| 556 | if (strcmp(t->dev_attr.attr.name, |
| 557 | iio_attr->dev_attr.attr.name) == 0) { |
| 558 | if (!generic) |
| 559 | dev_err(dev, "tried to double register : %s\n", |
| 560 | t->dev_attr.attr.name); |
| 561 | ret = -EBUSY; |
| 562 | goto error_device_attr_deinit; |
| 563 | } |
Jonathan Cameron | 1d89271 | 2011-05-18 14:40:51 +0100 | [diff] [blame] | 564 | list_add(&iio_attr->l, attr_list); |
| 565 | |
| 566 | return 0; |
| 567 | |
| 568 | error_device_attr_deinit: |
| 569 | __iio_device_attr_deinit(&iio_attr->dev_attr); |
| 570 | error_iio_dev_attr_free: |
| 571 | kfree(iio_attr); |
| 572 | error_ret: |
| 573 | return ret; |
| 574 | } |
| 575 | |
Jonathan Cameron | f8c6f4e | 2011-10-06 17:14:35 +0100 | [diff] [blame] | 576 | static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev, |
Jonathan Cameron | 1d89271 | 2011-05-18 14:40:51 +0100 | [diff] [blame] | 577 | struct iio_chan_spec const *chan) |
| 578 | { |
Jonathan Cameron | 5ccb3ad | 2012-04-15 17:41:16 +0100 | [diff] [blame] | 579 | int ret, attrcount = 0; |
Jonathan Cameron | 75a973c | 2012-04-15 17:41:30 +0100 | [diff] [blame] | 580 | int i; |
Lars-Peter Clausen | 5f420b4 | 2012-02-21 18:38:12 +0100 | [diff] [blame] | 581 | const struct iio_chan_spec_ext_info *ext_info; |
Jonathan Cameron | 1d89271 | 2011-05-18 14:40:51 +0100 | [diff] [blame] | 582 | |
Jonathan Cameron | 1d89271 | 2011-05-18 14:40:51 +0100 | [diff] [blame] | 583 | if (chan->channel < 0) |
| 584 | return 0; |
Jonathan Cameron | 75a973c | 2012-04-15 17:41:30 +0100 | [diff] [blame] | 585 | for_each_set_bit(i, &chan->info_mask, sizeof(long)*8) { |
Jonathan Cameron | 1d89271 | 2011-05-18 14:40:51 +0100 | [diff] [blame] | 586 | ret = __iio_add_chan_devattr(iio_chan_info_postfix[i/2], |
Jonathan Cameron | 26d25ae | 2011-09-02 17:14:40 +0100 | [diff] [blame] | 587 | chan, |
Jonathan Cameron | 1d89271 | 2011-05-18 14:40:51 +0100 | [diff] [blame] | 588 | &iio_read_channel_info, |
| 589 | &iio_write_channel_info, |
Jonathan Cameron | c8a9f80 | 2011-10-26 17:41:36 +0100 | [diff] [blame] | 590 | i/2, |
Jonathan Cameron | 1d89271 | 2011-05-18 14:40:51 +0100 | [diff] [blame] | 591 | !(i%2), |
Jonathan Cameron | f8c6f4e | 2011-10-06 17:14:35 +0100 | [diff] [blame] | 592 | &indio_dev->dev, |
| 593 | &indio_dev->channel_attr_list); |
Jonathan Cameron | 1d89271 | 2011-05-18 14:40:51 +0100 | [diff] [blame] | 594 | if (ret == -EBUSY && (i%2 == 0)) { |
| 595 | ret = 0; |
| 596 | continue; |
| 597 | } |
| 598 | if (ret < 0) |
| 599 | goto error_ret; |
Jonathan Cameron | 26d25ae | 2011-09-02 17:14:40 +0100 | [diff] [blame] | 600 | attrcount++; |
Jonathan Cameron | 1d89271 | 2011-05-18 14:40:51 +0100 | [diff] [blame] | 601 | } |
Lars-Peter Clausen | 5f420b4 | 2012-02-21 18:38:12 +0100 | [diff] [blame] | 602 | |
| 603 | if (chan->ext_info) { |
| 604 | unsigned int i = 0; |
| 605 | for (ext_info = chan->ext_info; ext_info->name; ext_info++) { |
| 606 | ret = __iio_add_chan_devattr(ext_info->name, |
| 607 | chan, |
| 608 | ext_info->read ? |
| 609 | &iio_read_channel_ext_info : NULL, |
| 610 | ext_info->write ? |
| 611 | &iio_write_channel_ext_info : NULL, |
| 612 | i, |
| 613 | ext_info->shared, |
| 614 | &indio_dev->dev, |
| 615 | &indio_dev->channel_attr_list); |
| 616 | i++; |
| 617 | if (ret == -EBUSY && ext_info->shared) |
| 618 | continue; |
| 619 | |
| 620 | if (ret) |
| 621 | goto error_ret; |
| 622 | |
| 623 | attrcount++; |
| 624 | } |
| 625 | } |
| 626 | |
Jonathan Cameron | 26d25ae | 2011-09-02 17:14:40 +0100 | [diff] [blame] | 627 | ret = attrcount; |
Jonathan Cameron | 1d89271 | 2011-05-18 14:40:51 +0100 | [diff] [blame] | 628 | error_ret: |
| 629 | return ret; |
| 630 | } |
| 631 | |
Jonathan Cameron | f8c6f4e | 2011-10-06 17:14:35 +0100 | [diff] [blame] | 632 | static void iio_device_remove_and_free_read_attr(struct iio_dev *indio_dev, |
Jonathan Cameron | 1d89271 | 2011-05-18 14:40:51 +0100 | [diff] [blame] | 633 | struct iio_dev_attr *p) |
| 634 | { |
Jonathan Cameron | 1d89271 | 2011-05-18 14:40:51 +0100 | [diff] [blame] | 635 | kfree(p->dev_attr.attr.name); |
| 636 | kfree(p); |
| 637 | } |
| 638 | |
Jonathan Cameron | 1b73288 | 2011-05-18 14:41:43 +0100 | [diff] [blame] | 639 | static ssize_t iio_show_dev_name(struct device *dev, |
| 640 | struct device_attribute *attr, |
| 641 | char *buf) |
| 642 | { |
| 643 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| 644 | return sprintf(buf, "%s\n", indio_dev->name); |
| 645 | } |
| 646 | |
| 647 | static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL); |
| 648 | |
Jonathan Cameron | f8c6f4e | 2011-10-06 17:14:35 +0100 | [diff] [blame] | 649 | static int iio_device_register_sysfs(struct iio_dev *indio_dev) |
Jonathan Cameron | 1d89271 | 2011-05-18 14:40:51 +0100 | [diff] [blame] | 650 | { |
Jonathan Cameron | 26d25ae | 2011-09-02 17:14:40 +0100 | [diff] [blame] | 651 | int i, ret = 0, attrcount, attrn, attrcount_orig = 0; |
Jonathan Cameron | 1d89271 | 2011-05-18 14:40:51 +0100 | [diff] [blame] | 652 | struct iio_dev_attr *p, *n; |
Jonathan Cameron | 26d25ae | 2011-09-02 17:14:40 +0100 | [diff] [blame] | 653 | struct attribute **attr; |
Jonathan Cameron | 1d89271 | 2011-05-18 14:40:51 +0100 | [diff] [blame] | 654 | |
Jonathan Cameron | 26d25ae | 2011-09-02 17:14:40 +0100 | [diff] [blame] | 655 | /* First count elements in any existing group */ |
Jonathan Cameron | f8c6f4e | 2011-10-06 17:14:35 +0100 | [diff] [blame] | 656 | if (indio_dev->info->attrs) { |
| 657 | attr = indio_dev->info->attrs->attrs; |
Jonathan Cameron | 26d25ae | 2011-09-02 17:14:40 +0100 | [diff] [blame] | 658 | while (*attr++ != NULL) |
| 659 | attrcount_orig++; |
Jonathan Cameron | 1d89271 | 2011-05-18 14:40:51 +0100 | [diff] [blame] | 660 | } |
Jonathan Cameron | 26d25ae | 2011-09-02 17:14:40 +0100 | [diff] [blame] | 661 | attrcount = attrcount_orig; |
Jonathan Cameron | 1d89271 | 2011-05-18 14:40:51 +0100 | [diff] [blame] | 662 | /* |
| 663 | * New channel registration method - relies on the fact a group does |
Justin P. Mattock | 4abf6f8 | 2012-02-29 22:00:38 -0800 | [diff] [blame] | 664 | * not need to be initialized if it is name is NULL. |
Jonathan Cameron | 1d89271 | 2011-05-18 14:40:51 +0100 | [diff] [blame] | 665 | */ |
Jonathan Cameron | f8c6f4e | 2011-10-06 17:14:35 +0100 | [diff] [blame] | 666 | INIT_LIST_HEAD(&indio_dev->channel_attr_list); |
| 667 | if (indio_dev->channels) |
| 668 | for (i = 0; i < indio_dev->num_channels; i++) { |
| 669 | ret = iio_device_add_channel_sysfs(indio_dev, |
| 670 | &indio_dev |
Jonathan Cameron | 1d89271 | 2011-05-18 14:40:51 +0100 | [diff] [blame] | 671 | ->channels[i]); |
| 672 | if (ret < 0) |
| 673 | goto error_clear_attrs; |
Jonathan Cameron | 26d25ae | 2011-09-02 17:14:40 +0100 | [diff] [blame] | 674 | attrcount += ret; |
Jonathan Cameron | 1d89271 | 2011-05-18 14:40:51 +0100 | [diff] [blame] | 675 | } |
Jonathan Cameron | 26d25ae | 2011-09-02 17:14:40 +0100 | [diff] [blame] | 676 | |
Jonathan Cameron | f8c6f4e | 2011-10-06 17:14:35 +0100 | [diff] [blame] | 677 | if (indio_dev->name) |
Jonathan Cameron | 26d25ae | 2011-09-02 17:14:40 +0100 | [diff] [blame] | 678 | attrcount++; |
| 679 | |
Thomas Meyer | d83fb18 | 2011-11-29 22:08:00 +0100 | [diff] [blame] | 680 | indio_dev->chan_attr_group.attrs = kcalloc(attrcount + 1, |
| 681 | sizeof(indio_dev->chan_attr_group.attrs[0]), |
| 682 | GFP_KERNEL); |
Jonathan Cameron | f8c6f4e | 2011-10-06 17:14:35 +0100 | [diff] [blame] | 683 | if (indio_dev->chan_attr_group.attrs == NULL) { |
Jonathan Cameron | 26d25ae | 2011-09-02 17:14:40 +0100 | [diff] [blame] | 684 | ret = -ENOMEM; |
| 685 | goto error_clear_attrs; |
Jonathan Cameron | 1b73288 | 2011-05-18 14:41:43 +0100 | [diff] [blame] | 686 | } |
Jonathan Cameron | 26d25ae | 2011-09-02 17:14:40 +0100 | [diff] [blame] | 687 | /* Copy across original attributes */ |
Jonathan Cameron | f8c6f4e | 2011-10-06 17:14:35 +0100 | [diff] [blame] | 688 | if (indio_dev->info->attrs) |
| 689 | memcpy(indio_dev->chan_attr_group.attrs, |
| 690 | indio_dev->info->attrs->attrs, |
| 691 | sizeof(indio_dev->chan_attr_group.attrs[0]) |
Jonathan Cameron | 26d25ae | 2011-09-02 17:14:40 +0100 | [diff] [blame] | 692 | *attrcount_orig); |
| 693 | attrn = attrcount_orig; |
| 694 | /* Add all elements from the list. */ |
Jonathan Cameron | f8c6f4e | 2011-10-06 17:14:35 +0100 | [diff] [blame] | 695 | list_for_each_entry(p, &indio_dev->channel_attr_list, l) |
| 696 | indio_dev->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr; |
| 697 | if (indio_dev->name) |
| 698 | indio_dev->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr; |
Jonathan Cameron | 26d25ae | 2011-09-02 17:14:40 +0100 | [diff] [blame] | 699 | |
Jonathan Cameron | f8c6f4e | 2011-10-06 17:14:35 +0100 | [diff] [blame] | 700 | indio_dev->groups[indio_dev->groupcounter++] = |
| 701 | &indio_dev->chan_attr_group; |
Jonathan Cameron | 26d25ae | 2011-09-02 17:14:40 +0100 | [diff] [blame] | 702 | |
Jonathan Cameron | 1d89271 | 2011-05-18 14:40:51 +0100 | [diff] [blame] | 703 | return 0; |
Jonathan Cameron | 1b73288 | 2011-05-18 14:41:43 +0100 | [diff] [blame] | 704 | |
Jonathan Cameron | 1d89271 | 2011-05-18 14:40:51 +0100 | [diff] [blame] | 705 | error_clear_attrs: |
| 706 | list_for_each_entry_safe(p, n, |
Jonathan Cameron | f8c6f4e | 2011-10-06 17:14:35 +0100 | [diff] [blame] | 707 | &indio_dev->channel_attr_list, l) { |
Jonathan Cameron | 1d89271 | 2011-05-18 14:40:51 +0100 | [diff] [blame] | 708 | list_del(&p->l); |
Jonathan Cameron | f8c6f4e | 2011-10-06 17:14:35 +0100 | [diff] [blame] | 709 | iio_device_remove_and_free_read_attr(indio_dev, p); |
Jonathan Cameron | 1d89271 | 2011-05-18 14:40:51 +0100 | [diff] [blame] | 710 | } |
Jonathan Cameron | 1d89271 | 2011-05-18 14:40:51 +0100 | [diff] [blame] | 711 | |
Jonathan Cameron | 26d25ae | 2011-09-02 17:14:40 +0100 | [diff] [blame] | 712 | return ret; |
Jonathan Cameron | 1d89271 | 2011-05-18 14:40:51 +0100 | [diff] [blame] | 713 | } |
| 714 | |
Jonathan Cameron | f8c6f4e | 2011-10-06 17:14:35 +0100 | [diff] [blame] | 715 | static void iio_device_unregister_sysfs(struct iio_dev *indio_dev) |
Jonathan Cameron | 847ec80 | 2009-08-18 18:06:19 +0100 | [diff] [blame] | 716 | { |
Jonathan Cameron | 1d89271 | 2011-05-18 14:40:51 +0100 | [diff] [blame] | 717 | |
| 718 | struct iio_dev_attr *p, *n; |
Jonathan Cameron | 26d25ae | 2011-09-02 17:14:40 +0100 | [diff] [blame] | 719 | |
Jonathan Cameron | f8c6f4e | 2011-10-06 17:14:35 +0100 | [diff] [blame] | 720 | list_for_each_entry_safe(p, n, &indio_dev->channel_attr_list, l) { |
Jonathan Cameron | 1d89271 | 2011-05-18 14:40:51 +0100 | [diff] [blame] | 721 | list_del(&p->l); |
Jonathan Cameron | f8c6f4e | 2011-10-06 17:14:35 +0100 | [diff] [blame] | 722 | iio_device_remove_and_free_read_attr(indio_dev, p); |
Jonathan Cameron | 1d89271 | 2011-05-18 14:40:51 +0100 | [diff] [blame] | 723 | } |
Jonathan Cameron | f8c6f4e | 2011-10-06 17:14:35 +0100 | [diff] [blame] | 724 | kfree(indio_dev->chan_attr_group.attrs); |
Jonathan Cameron | 847ec80 | 2009-08-18 18:06:19 +0100 | [diff] [blame] | 725 | } |
| 726 | |
Jonathan Cameron | 847ec80 | 2009-08-18 18:06:19 +0100 | [diff] [blame] | 727 | static void iio_dev_release(struct device *device) |
| 728 | { |
Jonathan Cameron | f8c6f4e | 2011-10-06 17:14:35 +0100 | [diff] [blame] | 729 | struct iio_dev *indio_dev = container_of(device, struct iio_dev, dev); |
| 730 | cdev_del(&indio_dev->chrdev); |
| 731 | if (indio_dev->modes & INDIO_BUFFER_TRIGGERED) |
| 732 | iio_device_unregister_trigger_consumer(indio_dev); |
| 733 | iio_device_unregister_eventset(indio_dev); |
| 734 | iio_device_unregister_sysfs(indio_dev); |
Michael Hennerich | e553f18 | 2012-03-01 10:51:03 +0100 | [diff] [blame] | 735 | iio_device_unregister_debugfs(indio_dev); |
Jonathan Cameron | 847ec80 | 2009-08-18 18:06:19 +0100 | [diff] [blame] | 736 | } |
| 737 | |
| 738 | static struct device_type iio_dev_type = { |
| 739 | .name = "iio_device", |
| 740 | .release = iio_dev_release, |
| 741 | }; |
| 742 | |
Lars-Peter Clausen | 7cbb753 | 2012-04-26 13:35:01 +0200 | [diff] [blame] | 743 | struct iio_dev *iio_device_alloc(int sizeof_priv) |
Jonathan Cameron | 847ec80 | 2009-08-18 18:06:19 +0100 | [diff] [blame] | 744 | { |
Jonathan Cameron | 6f7c8ee | 2011-04-15 18:55:56 +0100 | [diff] [blame] | 745 | struct iio_dev *dev; |
| 746 | size_t alloc_size; |
| 747 | |
| 748 | alloc_size = sizeof(struct iio_dev); |
| 749 | if (sizeof_priv) { |
| 750 | alloc_size = ALIGN(alloc_size, IIO_ALIGN); |
| 751 | alloc_size += sizeof_priv; |
| 752 | } |
| 753 | /* ensure 32-byte alignment of whole construct ? */ |
| 754 | alloc_size += IIO_ALIGN - 1; |
| 755 | |
| 756 | dev = kzalloc(alloc_size, GFP_KERNEL); |
Jonathan Cameron | 847ec80 | 2009-08-18 18:06:19 +0100 | [diff] [blame] | 757 | |
| 758 | if (dev) { |
Jonathan Cameron | 26d25ae | 2011-09-02 17:14:40 +0100 | [diff] [blame] | 759 | dev->dev.groups = dev->groups; |
Jonathan Cameron | 847ec80 | 2009-08-18 18:06:19 +0100 | [diff] [blame] | 760 | dev->dev.type = &iio_dev_type; |
Jonathan Cameron | 5aaaeba | 2010-05-04 14:43:00 +0100 | [diff] [blame] | 761 | dev->dev.bus = &iio_bus_type; |
Jonathan Cameron | 847ec80 | 2009-08-18 18:06:19 +0100 | [diff] [blame] | 762 | device_initialize(&dev->dev); |
| 763 | dev_set_drvdata(&dev->dev, (void *)dev); |
| 764 | mutex_init(&dev->mlock); |
Jonathan Cameron | ac917a8 | 2012-02-15 19:48:00 +0000 | [diff] [blame] | 765 | mutex_init(&dev->info_exist_lock); |
Jonathan Cameron | a9e39f9 | 2011-09-14 13:01:25 +0100 | [diff] [blame] | 766 | |
| 767 | dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL); |
| 768 | if (dev->id < 0) { |
| 769 | /* cannot use a dev_err as the name isn't available */ |
| 770 | printk(KERN_ERR "Failed to get id\n"); |
| 771 | kfree(dev); |
| 772 | return NULL; |
| 773 | } |
| 774 | dev_set_name(&dev->dev, "iio:device%d", dev->id); |
Jonathan Cameron | 847ec80 | 2009-08-18 18:06:19 +0100 | [diff] [blame] | 775 | } |
| 776 | |
| 777 | return dev; |
| 778 | } |
Lars-Peter Clausen | 7cbb753 | 2012-04-26 13:35:01 +0200 | [diff] [blame] | 779 | EXPORT_SYMBOL(iio_device_alloc); |
Jonathan Cameron | 847ec80 | 2009-08-18 18:06:19 +0100 | [diff] [blame] | 780 | |
Lars-Peter Clausen | 7cbb753 | 2012-04-26 13:35:01 +0200 | [diff] [blame] | 781 | void iio_device_free(struct iio_dev *dev) |
Jonathan Cameron | 847ec80 | 2009-08-18 18:06:19 +0100 | [diff] [blame] | 782 | { |
Jonathan Cameron | a9e39f9 | 2011-09-14 13:01:25 +0100 | [diff] [blame] | 783 | if (dev) { |
| 784 | ida_simple_remove(&iio_ida, dev->id); |
Jonathan Cameron | 1aa0427 | 2011-08-30 12:32:47 +0100 | [diff] [blame] | 785 | kfree(dev); |
Jonathan Cameron | a9e39f9 | 2011-09-14 13:01:25 +0100 | [diff] [blame] | 786 | } |
Jonathan Cameron | 847ec80 | 2009-08-18 18:06:19 +0100 | [diff] [blame] | 787 | } |
Lars-Peter Clausen | 7cbb753 | 2012-04-26 13:35:01 +0200 | [diff] [blame] | 788 | EXPORT_SYMBOL(iio_device_free); |
Jonathan Cameron | 847ec80 | 2009-08-18 18:06:19 +0100 | [diff] [blame] | 789 | |
Jonathan Cameron | 1aa0427 | 2011-08-30 12:32:47 +0100 | [diff] [blame] | 790 | /** |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 791 | * iio_chrdev_open() - chrdev file open for buffer access and ioctls |
Jonathan Cameron | 1aa0427 | 2011-08-30 12:32:47 +0100 | [diff] [blame] | 792 | **/ |
| 793 | static int iio_chrdev_open(struct inode *inode, struct file *filp) |
| 794 | { |
Jonathan Cameron | f8c6f4e | 2011-10-06 17:14:35 +0100 | [diff] [blame] | 795 | struct iio_dev *indio_dev = container_of(inode->i_cdev, |
Jonathan Cameron | 1aa0427 | 2011-08-30 12:32:47 +0100 | [diff] [blame] | 796 | struct iio_dev, chrdev); |
Lars-Peter Clausen | bb01443 | 2011-12-19 15:23:45 +0100 | [diff] [blame] | 797 | |
| 798 | if (test_and_set_bit(IIO_BUSY_BIT_POS, &indio_dev->flags)) |
| 799 | return -EBUSY; |
| 800 | |
Jonathan Cameron | f8c6f4e | 2011-10-06 17:14:35 +0100 | [diff] [blame] | 801 | filp->private_data = indio_dev; |
Jonathan Cameron | 30eb82f | 2011-09-21 11:16:02 +0100 | [diff] [blame] | 802 | |
Lars-Peter Clausen | 7933514 | 2011-12-19 15:23:49 +0100 | [diff] [blame] | 803 | return 0; |
Jonathan Cameron | 1aa0427 | 2011-08-30 12:32:47 +0100 | [diff] [blame] | 804 | } |
| 805 | |
| 806 | /** |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 807 | * iio_chrdev_release() - chrdev file close buffer access and ioctls |
Jonathan Cameron | 1aa0427 | 2011-08-30 12:32:47 +0100 | [diff] [blame] | 808 | **/ |
| 809 | static int iio_chrdev_release(struct inode *inode, struct file *filp) |
| 810 | { |
Lars-Peter Clausen | bb01443 | 2011-12-19 15:23:45 +0100 | [diff] [blame] | 811 | struct iio_dev *indio_dev = container_of(inode->i_cdev, |
| 812 | struct iio_dev, chrdev); |
Lars-Peter Clausen | bb01443 | 2011-12-19 15:23:45 +0100 | [diff] [blame] | 813 | clear_bit(IIO_BUSY_BIT_POS, &indio_dev->flags); |
Jonathan Cameron | 1aa0427 | 2011-08-30 12:32:47 +0100 | [diff] [blame] | 814 | return 0; |
| 815 | } |
| 816 | |
| 817 | /* Somewhat of a cross file organization violation - ioctls here are actually |
| 818 | * event related */ |
| 819 | static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
| 820 | { |
| 821 | struct iio_dev *indio_dev = filp->private_data; |
| 822 | int __user *ip = (int __user *)arg; |
| 823 | int fd; |
| 824 | |
| 825 | if (cmd == IIO_GET_EVENT_FD_IOCTL) { |
| 826 | fd = iio_event_getfd(indio_dev); |
| 827 | if (copy_to_user(ip, &fd, sizeof(fd))) |
| 828 | return -EFAULT; |
| 829 | return 0; |
| 830 | } |
| 831 | return -EINVAL; |
| 832 | } |
| 833 | |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 834 | static const struct file_operations iio_buffer_fileops = { |
| 835 | .read = iio_buffer_read_first_n_outer_addr, |
Jonathan Cameron | 1aa0427 | 2011-08-30 12:32:47 +0100 | [diff] [blame] | 836 | .release = iio_chrdev_release, |
| 837 | .open = iio_chrdev_open, |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 838 | .poll = iio_buffer_poll_addr, |
Jonathan Cameron | 1aa0427 | 2011-08-30 12:32:47 +0100 | [diff] [blame] | 839 | .owner = THIS_MODULE, |
| 840 | .llseek = noop_llseek, |
| 841 | .unlocked_ioctl = iio_ioctl, |
| 842 | .compat_ioctl = iio_ioctl, |
| 843 | }; |
| 844 | |
Michael Hennerich | 0f1acee | 2012-03-01 10:51:04 +0100 | [diff] [blame] | 845 | static const struct iio_buffer_setup_ops noop_ring_setup_ops; |
| 846 | |
Jonathan Cameron | f8c6f4e | 2011-10-06 17:14:35 +0100 | [diff] [blame] | 847 | int iio_device_register(struct iio_dev *indio_dev) |
Jonathan Cameron | 847ec80 | 2009-08-18 18:06:19 +0100 | [diff] [blame] | 848 | { |
| 849 | int ret; |
| 850 | |
Jonathan Cameron | 1aa0427 | 2011-08-30 12:32:47 +0100 | [diff] [blame] | 851 | /* configure elements for the chrdev */ |
Jonathan Cameron | f8c6f4e | 2011-10-06 17:14:35 +0100 | [diff] [blame] | 852 | indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), indio_dev->id); |
Jonathan Cameron | 847ec80 | 2009-08-18 18:06:19 +0100 | [diff] [blame] | 853 | |
Michael Hennerich | e553f18 | 2012-03-01 10:51:03 +0100 | [diff] [blame] | 854 | ret = iio_device_register_debugfs(indio_dev); |
| 855 | if (ret) { |
| 856 | dev_err(indio_dev->dev.parent, |
| 857 | "Failed to register debugfs interfaces\n"); |
| 858 | goto error_ret; |
| 859 | } |
Jonathan Cameron | f8c6f4e | 2011-10-06 17:14:35 +0100 | [diff] [blame] | 860 | ret = iio_device_register_sysfs(indio_dev); |
Jonathan Cameron | 847ec80 | 2009-08-18 18:06:19 +0100 | [diff] [blame] | 861 | if (ret) { |
Jonathan Cameron | f8c6f4e | 2011-10-06 17:14:35 +0100 | [diff] [blame] | 862 | dev_err(indio_dev->dev.parent, |
Jonathan Cameron | 847ec80 | 2009-08-18 18:06:19 +0100 | [diff] [blame] | 863 | "Failed to register sysfs interfaces\n"); |
Michael Hennerich | e553f18 | 2012-03-01 10:51:03 +0100 | [diff] [blame] | 864 | goto error_unreg_debugfs; |
Jonathan Cameron | 847ec80 | 2009-08-18 18:06:19 +0100 | [diff] [blame] | 865 | } |
Jonathan Cameron | f8c6f4e | 2011-10-06 17:14:35 +0100 | [diff] [blame] | 866 | ret = iio_device_register_eventset(indio_dev); |
Jonathan Cameron | 847ec80 | 2009-08-18 18:06:19 +0100 | [diff] [blame] | 867 | if (ret) { |
Jonathan Cameron | f8c6f4e | 2011-10-06 17:14:35 +0100 | [diff] [blame] | 868 | dev_err(indio_dev->dev.parent, |
Roel Van Nyen | c849d25 | 2010-04-29 19:27:31 +0200 | [diff] [blame] | 869 | "Failed to register event set\n"); |
Jonathan Cameron | 847ec80 | 2009-08-18 18:06:19 +0100 | [diff] [blame] | 870 | goto error_free_sysfs; |
| 871 | } |
Jonathan Cameron | f8c6f4e | 2011-10-06 17:14:35 +0100 | [diff] [blame] | 872 | if (indio_dev->modes & INDIO_BUFFER_TRIGGERED) |
| 873 | iio_device_register_trigger_consumer(indio_dev); |
Jonathan Cameron | 847ec80 | 2009-08-18 18:06:19 +0100 | [diff] [blame] | 874 | |
Michael Hennerich | 0f1acee | 2012-03-01 10:51:04 +0100 | [diff] [blame] | 875 | if ((indio_dev->modes & INDIO_ALL_BUFFER_MODES) && |
| 876 | indio_dev->setup_ops == NULL) |
| 877 | indio_dev->setup_ops = &noop_ring_setup_ops; |
| 878 | |
Jonathan Cameron | f8c6f4e | 2011-10-06 17:14:35 +0100 | [diff] [blame] | 879 | ret = device_add(&indio_dev->dev); |
Jonathan Cameron | 26d25ae | 2011-09-02 17:14:40 +0100 | [diff] [blame] | 880 | if (ret < 0) |
| 881 | goto error_unreg_eventset; |
Jonathan Cameron | f8c6f4e | 2011-10-06 17:14:35 +0100 | [diff] [blame] | 882 | cdev_init(&indio_dev->chrdev, &iio_buffer_fileops); |
| 883 | indio_dev->chrdev.owner = indio_dev->info->driver_module; |
| 884 | ret = cdev_add(&indio_dev->chrdev, indio_dev->dev.devt, 1); |
Jonathan Cameron | 26d25ae | 2011-09-02 17:14:40 +0100 | [diff] [blame] | 885 | if (ret < 0) |
| 886 | goto error_del_device; |
Jonathan Cameron | 847ec80 | 2009-08-18 18:06:19 +0100 | [diff] [blame] | 887 | return 0; |
| 888 | |
Jonathan Cameron | 847ec80 | 2009-08-18 18:06:19 +0100 | [diff] [blame] | 889 | error_del_device: |
Jonathan Cameron | f8c6f4e | 2011-10-06 17:14:35 +0100 | [diff] [blame] | 890 | device_del(&indio_dev->dev); |
Jonathan Cameron | 26d25ae | 2011-09-02 17:14:40 +0100 | [diff] [blame] | 891 | error_unreg_eventset: |
Jonathan Cameron | f8c6f4e | 2011-10-06 17:14:35 +0100 | [diff] [blame] | 892 | iio_device_unregister_eventset(indio_dev); |
Jonathan Cameron | 26d25ae | 2011-09-02 17:14:40 +0100 | [diff] [blame] | 893 | error_free_sysfs: |
Jonathan Cameron | f8c6f4e | 2011-10-06 17:14:35 +0100 | [diff] [blame] | 894 | iio_device_unregister_sysfs(indio_dev); |
Michael Hennerich | e553f18 | 2012-03-01 10:51:03 +0100 | [diff] [blame] | 895 | error_unreg_debugfs: |
| 896 | iio_device_unregister_debugfs(indio_dev); |
Jonathan Cameron | 847ec80 | 2009-08-18 18:06:19 +0100 | [diff] [blame] | 897 | error_ret: |
| 898 | return ret; |
| 899 | } |
| 900 | EXPORT_SYMBOL(iio_device_register); |
| 901 | |
Jonathan Cameron | f8c6f4e | 2011-10-06 17:14:35 +0100 | [diff] [blame] | 902 | void iio_device_unregister(struct iio_dev *indio_dev) |
Jonathan Cameron | 847ec80 | 2009-08-18 18:06:19 +0100 | [diff] [blame] | 903 | { |
Jonathan Cameron | ac917a8 | 2012-02-15 19:48:00 +0000 | [diff] [blame] | 904 | mutex_lock(&indio_dev->info_exist_lock); |
| 905 | indio_dev->info = NULL; |
| 906 | mutex_unlock(&indio_dev->info_exist_lock); |
Jonathan Cameron | f8c6f4e | 2011-10-06 17:14:35 +0100 | [diff] [blame] | 907 | device_unregister(&indio_dev->dev); |
Jonathan Cameron | 847ec80 | 2009-08-18 18:06:19 +0100 | [diff] [blame] | 908 | } |
| 909 | EXPORT_SYMBOL(iio_device_unregister); |
Jonathan Cameron | 847ec80 | 2009-08-18 18:06:19 +0100 | [diff] [blame] | 910 | subsys_initcall(iio_init); |
| 911 | module_exit(iio_exit); |
| 912 | |
| 913 | MODULE_AUTHOR("Jonathan Cameron <jic23@cam.ac.uk>"); |
| 914 | MODULE_DESCRIPTION("Industrial I/O core"); |
| 915 | MODULE_LICENSE("GPL"); |