Michael Hennerich | f94aa35 | 2011-08-02 08:48:22 +0200 | [diff] [blame] | 1 | /* |
| 2 | * AD5933 AD5934 Impedance Converter, Network Analyzer |
| 3 | * |
| 4 | * Copyright 2011 Analog Devices Inc. |
| 5 | * |
| 6 | * Licensed under the GPL-2. |
| 7 | */ |
| 8 | |
| 9 | #include <linux/interrupt.h> |
| 10 | #include <linux/device.h> |
| 11 | #include <linux/kernel.h> |
| 12 | #include <linux/sysfs.h> |
| 13 | #include <linux/i2c.h> |
| 14 | #include <linux/regulator/consumer.h> |
| 15 | #include <linux/slab.h> |
| 16 | #include <linux/types.h> |
| 17 | #include <linux/err.h> |
| 18 | #include <linux/delay.h> |
Paul Gortmaker | 748b636 | 2011-09-30 18:06:58 -0400 | [diff] [blame] | 19 | #include <linux/module.h> |
Michael Hennerich | f94aa35 | 2011-08-02 08:48:22 +0200 | [diff] [blame] | 20 | #include <asm/div64.h> |
| 21 | |
| 22 | #include "../iio.h" |
| 23 | #include "../sysfs.h" |
Jonathan Cameron | af5046a | 2011-10-26 17:41:32 +0100 | [diff] [blame^] | 24 | #include "../buffer.h" |
Michael Hennerich | f94aa35 | 2011-08-02 08:48:22 +0200 | [diff] [blame] | 25 | #include "../ring_sw.h" |
| 26 | |
| 27 | #include "ad5933.h" |
| 28 | |
| 29 | /* AD5933/AD5934 Registers */ |
| 30 | #define AD5933_REG_CONTROL_HB 0x80 /* R/W, 2 bytes */ |
| 31 | #define AD5933_REG_CONTROL_LB 0x81 /* R/W, 2 bytes */ |
| 32 | #define AD5933_REG_FREQ_START 0x82 /* R/W, 3 bytes */ |
| 33 | #define AD5933_REG_FREQ_INC 0x85 /* R/W, 3 bytes */ |
| 34 | #define AD5933_REG_INC_NUM 0x88 /* R/W, 2 bytes, 9 bit */ |
| 35 | #define AD5933_REG_SETTLING_CYCLES 0x8A /* R/W, 2 bytes */ |
| 36 | #define AD5933_REG_STATUS 0x8F /* R, 1 byte */ |
| 37 | #define AD5933_REG_TEMP_DATA 0x92 /* R, 2 bytes*/ |
| 38 | #define AD5933_REG_REAL_DATA 0x94 /* R, 2 bytes*/ |
| 39 | #define AD5933_REG_IMAG_DATA 0x96 /* R, 2 bytes*/ |
| 40 | |
| 41 | /* AD5933_REG_CONTROL_HB Bits */ |
| 42 | #define AD5933_CTRL_INIT_START_FREQ (0x1 << 4) |
| 43 | #define AD5933_CTRL_START_SWEEP (0x2 << 4) |
| 44 | #define AD5933_CTRL_INC_FREQ (0x3 << 4) |
| 45 | #define AD5933_CTRL_REPEAT_FREQ (0x4 << 4) |
| 46 | #define AD5933_CTRL_MEASURE_TEMP (0x9 << 4) |
| 47 | #define AD5933_CTRL_POWER_DOWN (0xA << 4) |
| 48 | #define AD5933_CTRL_STANDBY (0xB << 4) |
| 49 | |
| 50 | #define AD5933_CTRL_RANGE_2000mVpp (0x0 << 1) |
| 51 | #define AD5933_CTRL_RANGE_200mVpp (0x1 << 1) |
| 52 | #define AD5933_CTRL_RANGE_400mVpp (0x2 << 1) |
| 53 | #define AD5933_CTRL_RANGE_1000mVpp (0x3 << 1) |
| 54 | #define AD5933_CTRL_RANGE(x) ((x) << 1) |
| 55 | |
| 56 | #define AD5933_CTRL_PGA_GAIN_1 (0x1 << 0) |
| 57 | #define AD5933_CTRL_PGA_GAIN_5 (0x0 << 0) |
| 58 | |
| 59 | /* AD5933_REG_CONTROL_LB Bits */ |
| 60 | #define AD5933_CTRL_RESET (0x1 << 4) |
| 61 | #define AD5933_CTRL_INT_SYSCLK (0x0 << 3) |
| 62 | #define AD5933_CTRL_EXT_SYSCLK (0x1 << 3) |
| 63 | |
| 64 | /* AD5933_REG_STATUS Bits */ |
| 65 | #define AD5933_STAT_TEMP_VALID (0x1 << 0) |
| 66 | #define AD5933_STAT_DATA_VALID (0x1 << 1) |
| 67 | #define AD5933_STAT_SWEEP_DONE (0x1 << 2) |
| 68 | |
| 69 | /* I2C Block Commands */ |
| 70 | #define AD5933_I2C_BLOCK_WRITE 0xA0 |
| 71 | #define AD5933_I2C_BLOCK_READ 0xA1 |
| 72 | #define AD5933_I2C_ADDR_POINTER 0xB0 |
| 73 | |
| 74 | /* Device Specs */ |
| 75 | #define AD5933_INT_OSC_FREQ_Hz 16776000 |
| 76 | #define AD5933_MAX_OUTPUT_FREQ_Hz 100000 |
| 77 | #define AD5933_MAX_RETRIES 100 |
| 78 | |
| 79 | #define AD5933_OUT_RANGE 1 |
| 80 | #define AD5933_OUT_RANGE_AVAIL 2 |
| 81 | #define AD5933_OUT_SETTLING_CYCLES 3 |
| 82 | #define AD5933_IN_PGA_GAIN 4 |
| 83 | #define AD5933_IN_PGA_GAIN_AVAIL 5 |
| 84 | #define AD5933_FREQ_POINTS 6 |
| 85 | |
| 86 | #define AD5933_POLL_TIME_ms 10 |
| 87 | #define AD5933_INIT_EXCITATION_TIME_ms 100 |
| 88 | |
| 89 | struct ad5933_state { |
| 90 | struct i2c_client *client; |
| 91 | struct regulator *reg; |
| 92 | struct ad5933_platform_data *pdata; |
| 93 | struct delayed_work work; |
| 94 | unsigned long mclk_hz; |
| 95 | unsigned char ctrl_hb; |
| 96 | unsigned char ctrl_lb; |
| 97 | unsigned range_avail[4]; |
| 98 | unsigned short vref_mv; |
| 99 | unsigned short settling_cycles; |
| 100 | unsigned short freq_points; |
| 101 | unsigned freq_start; |
| 102 | unsigned freq_inc; |
| 103 | unsigned state; |
| 104 | unsigned poll_time_jiffies; |
| 105 | }; |
| 106 | |
| 107 | static struct ad5933_platform_data ad5933_default_pdata = { |
| 108 | .vref_mv = 3300, |
| 109 | }; |
| 110 | |
| 111 | static struct iio_chan_spec ad5933_channels[] = { |
| 112 | IIO_CHAN(IIO_TEMP, 0, 1, 1, NULL, 0, 0, 0, |
| 113 | 0, AD5933_REG_TEMP_DATA, IIO_ST('s', 14, 16, 0), 0), |
| 114 | /* Ring Channels */ |
Jonathan Cameron | 6835cb6 | 2011-09-27 09:56:41 +0100 | [diff] [blame] | 115 | IIO_CHAN(IIO_VOLTAGE, 0, 1, 0, "real_raw", 0, 0, |
Michael Hennerich | f94aa35 | 2011-08-02 08:48:22 +0200 | [diff] [blame] | 116 | (1 << IIO_CHAN_INFO_SCALE_SEPARATE), |
| 117 | AD5933_REG_REAL_DATA, 0, IIO_ST('s', 16, 16, 0), 0), |
Jonathan Cameron | 6835cb6 | 2011-09-27 09:56:41 +0100 | [diff] [blame] | 118 | IIO_CHAN(IIO_VOLTAGE, 0, 1, 0, "imag_raw", 0, 0, |
Michael Hennerich | f94aa35 | 2011-08-02 08:48:22 +0200 | [diff] [blame] | 119 | (1 << IIO_CHAN_INFO_SCALE_SEPARATE), |
| 120 | AD5933_REG_IMAG_DATA, 1, IIO_ST('s', 16, 16, 0), 0), |
| 121 | }; |
| 122 | |
| 123 | static int ad5933_i2c_write(struct i2c_client *client, |
| 124 | u8 reg, u8 len, u8 *data) |
| 125 | { |
| 126 | int ret; |
| 127 | |
| 128 | while (len--) { |
| 129 | ret = i2c_smbus_write_byte_data(client, reg++, *data++); |
| 130 | if (ret < 0) { |
| 131 | dev_err(&client->dev, "I2C write error\n"); |
| 132 | return ret; |
| 133 | } |
| 134 | } |
| 135 | return 0; |
| 136 | } |
| 137 | |
| 138 | static int ad5933_i2c_read(struct i2c_client *client, |
| 139 | u8 reg, u8 len, u8 *data) |
| 140 | { |
| 141 | int ret; |
| 142 | |
| 143 | while (len--) { |
| 144 | ret = i2c_smbus_read_byte_data(client, reg++); |
| 145 | if (ret < 0) { |
| 146 | dev_err(&client->dev, "I2C read error\n"); |
| 147 | return ret; |
| 148 | } |
| 149 | *data++ = ret; |
| 150 | } |
| 151 | return 0; |
| 152 | } |
| 153 | |
| 154 | static int ad5933_cmd(struct ad5933_state *st, unsigned char cmd) |
| 155 | { |
| 156 | unsigned char dat = st->ctrl_hb | cmd; |
| 157 | |
| 158 | return ad5933_i2c_write(st->client, |
| 159 | AD5933_REG_CONTROL_HB, 1, &dat); |
| 160 | } |
| 161 | |
| 162 | static int ad5933_reset(struct ad5933_state *st) |
| 163 | { |
| 164 | unsigned char dat = st->ctrl_lb | AD5933_CTRL_RESET; |
| 165 | return ad5933_i2c_write(st->client, |
| 166 | AD5933_REG_CONTROL_LB, 1, &dat); |
| 167 | } |
| 168 | |
| 169 | static int ad5933_wait_busy(struct ad5933_state *st, unsigned char event) |
| 170 | { |
| 171 | unsigned char val, timeout = AD5933_MAX_RETRIES; |
| 172 | int ret; |
| 173 | |
| 174 | while (timeout--) { |
| 175 | ret = ad5933_i2c_read(st->client, AD5933_REG_STATUS, 1, &val); |
| 176 | if (ret < 0) |
| 177 | return ret; |
| 178 | if (val & event) |
| 179 | return val; |
| 180 | cpu_relax(); |
| 181 | mdelay(1); |
| 182 | } |
| 183 | |
| 184 | return -EAGAIN; |
| 185 | } |
| 186 | |
| 187 | static int ad5933_set_freq(struct ad5933_state *st, |
| 188 | unsigned reg, unsigned long freq) |
| 189 | { |
| 190 | unsigned long long freqreg; |
| 191 | union { |
| 192 | u32 d32; |
| 193 | u8 d8[4]; |
| 194 | } dat; |
| 195 | |
| 196 | freqreg = (u64) freq * (u64) (1 << 27); |
| 197 | do_div(freqreg, st->mclk_hz / 4); |
| 198 | |
| 199 | switch (reg) { |
| 200 | case AD5933_REG_FREQ_START: |
| 201 | st->freq_start = freq; |
| 202 | break; |
| 203 | case AD5933_REG_FREQ_INC: |
| 204 | st->freq_inc = freq; |
| 205 | break; |
| 206 | default: |
| 207 | return -EINVAL; |
| 208 | } |
| 209 | |
| 210 | dat.d32 = cpu_to_be32(freqreg); |
| 211 | return ad5933_i2c_write(st->client, reg, 3, &dat.d8[1]); |
| 212 | } |
| 213 | |
| 214 | static int ad5933_setup(struct ad5933_state *st) |
| 215 | { |
| 216 | unsigned short dat; |
| 217 | int ret; |
| 218 | |
| 219 | ret = ad5933_reset(st); |
| 220 | if (ret < 0) |
| 221 | return ret; |
| 222 | |
| 223 | ret = ad5933_set_freq(st, AD5933_REG_FREQ_START, 10000); |
| 224 | if (ret < 0) |
| 225 | return ret; |
| 226 | |
| 227 | ret = ad5933_set_freq(st, AD5933_REG_FREQ_INC, 200); |
| 228 | if (ret < 0) |
| 229 | return ret; |
| 230 | |
| 231 | st->settling_cycles = 10; |
| 232 | dat = cpu_to_be16(st->settling_cycles); |
| 233 | |
| 234 | ret = ad5933_i2c_write(st->client, |
| 235 | AD5933_REG_SETTLING_CYCLES, 2, (u8 *)&dat); |
| 236 | if (ret < 0) |
| 237 | return ret; |
| 238 | |
| 239 | st->freq_points = 100; |
| 240 | dat = cpu_to_be16(st->freq_points); |
| 241 | |
| 242 | return ad5933_i2c_write(st->client, AD5933_REG_INC_NUM, 2, (u8 *)&dat); |
| 243 | } |
| 244 | |
| 245 | static void ad5933_calc_out_ranges(struct ad5933_state *st) |
| 246 | { |
| 247 | int i; |
| 248 | unsigned normalized_3v3[4] = {1980, 198, 383, 970}; |
| 249 | |
| 250 | for (i = 0; i < 4; i++) |
| 251 | st->range_avail[i] = normalized_3v3[i] * st->vref_mv / 3300; |
| 252 | |
| 253 | } |
| 254 | |
| 255 | /* |
| 256 | * handles: AD5933_REG_FREQ_START and AD5933_REG_FREQ_INC |
| 257 | */ |
| 258 | |
| 259 | static ssize_t ad5933_show_frequency(struct device *dev, |
| 260 | struct device_attribute *attr, |
| 261 | char *buf) |
| 262 | { |
Jonathan Cameron | 638e59f | 2011-10-06 17:14:38 +0100 | [diff] [blame] | 263 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| 264 | struct ad5933_state *st = iio_priv(indio_dev); |
Michael Hennerich | f94aa35 | 2011-08-02 08:48:22 +0200 | [diff] [blame] | 265 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
| 266 | int ret; |
| 267 | unsigned long long freqreg; |
| 268 | union { |
| 269 | u32 d32; |
| 270 | u8 d8[4]; |
| 271 | } dat; |
| 272 | |
Jonathan Cameron | 638e59f | 2011-10-06 17:14:38 +0100 | [diff] [blame] | 273 | mutex_lock(&indio_dev->mlock); |
Michael Hennerich | f94aa35 | 2011-08-02 08:48:22 +0200 | [diff] [blame] | 274 | ret = ad5933_i2c_read(st->client, this_attr->address, 3, &dat.d8[1]); |
Jonathan Cameron | 638e59f | 2011-10-06 17:14:38 +0100 | [diff] [blame] | 275 | mutex_unlock(&indio_dev->mlock); |
Michael Hennerich | f94aa35 | 2011-08-02 08:48:22 +0200 | [diff] [blame] | 276 | if (ret < 0) |
| 277 | return ret; |
| 278 | |
| 279 | freqreg = be32_to_cpu(dat.d32) & 0xFFFFFF; |
| 280 | |
| 281 | freqreg = (u64) freqreg * (u64) (st->mclk_hz / 4); |
| 282 | do_div(freqreg, 1 << 27); |
| 283 | |
| 284 | return sprintf(buf, "%d\n", (int) freqreg); |
| 285 | } |
| 286 | |
| 287 | static ssize_t ad5933_store_frequency(struct device *dev, |
| 288 | struct device_attribute *attr, |
| 289 | const char *buf, |
| 290 | size_t len) |
| 291 | { |
Jonathan Cameron | 638e59f | 2011-10-06 17:14:38 +0100 | [diff] [blame] | 292 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| 293 | struct ad5933_state *st = iio_priv(indio_dev); |
Michael Hennerich | f94aa35 | 2011-08-02 08:48:22 +0200 | [diff] [blame] | 294 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
| 295 | long val; |
| 296 | int ret; |
| 297 | |
| 298 | ret = strict_strtoul(buf, 10, &val); |
| 299 | if (ret) |
| 300 | return ret; |
| 301 | |
| 302 | if (val > AD5933_MAX_OUTPUT_FREQ_Hz) |
| 303 | return -EINVAL; |
| 304 | |
Jonathan Cameron | 638e59f | 2011-10-06 17:14:38 +0100 | [diff] [blame] | 305 | mutex_lock(&indio_dev->mlock); |
Michael Hennerich | f94aa35 | 2011-08-02 08:48:22 +0200 | [diff] [blame] | 306 | ret = ad5933_set_freq(st, this_attr->address, val); |
Jonathan Cameron | 638e59f | 2011-10-06 17:14:38 +0100 | [diff] [blame] | 307 | mutex_unlock(&indio_dev->mlock); |
Michael Hennerich | f94aa35 | 2011-08-02 08:48:22 +0200 | [diff] [blame] | 308 | |
| 309 | return ret ? ret : len; |
| 310 | } |
| 311 | |
Jonathan Cameron | 322c956 | 2011-09-14 13:01:23 +0100 | [diff] [blame] | 312 | static IIO_DEVICE_ATTR(out_voltage0_freq_start, S_IRUGO | S_IWUSR, |
Michael Hennerich | f94aa35 | 2011-08-02 08:48:22 +0200 | [diff] [blame] | 313 | ad5933_show_frequency, |
| 314 | ad5933_store_frequency, |
| 315 | AD5933_REG_FREQ_START); |
| 316 | |
Jonathan Cameron | 322c956 | 2011-09-14 13:01:23 +0100 | [diff] [blame] | 317 | static IIO_DEVICE_ATTR(out_voltage0_freq_increment, S_IRUGO | S_IWUSR, |
Michael Hennerich | f94aa35 | 2011-08-02 08:48:22 +0200 | [diff] [blame] | 318 | ad5933_show_frequency, |
| 319 | ad5933_store_frequency, |
| 320 | AD5933_REG_FREQ_INC); |
| 321 | |
| 322 | static ssize_t ad5933_show(struct device *dev, |
| 323 | struct device_attribute *attr, |
| 324 | char *buf) |
| 325 | { |
Jonathan Cameron | 638e59f | 2011-10-06 17:14:38 +0100 | [diff] [blame] | 326 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| 327 | struct ad5933_state *st = iio_priv(indio_dev); |
Michael Hennerich | f94aa35 | 2011-08-02 08:48:22 +0200 | [diff] [blame] | 328 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
| 329 | int ret = 0, len = 0; |
| 330 | |
Jonathan Cameron | 638e59f | 2011-10-06 17:14:38 +0100 | [diff] [blame] | 331 | mutex_lock(&indio_dev->mlock); |
Michael Hennerich | e15fbc9 | 2011-10-25 10:51:04 +0200 | [diff] [blame] | 332 | switch ((u32) this_attr->address) { |
Michael Hennerich | f94aa35 | 2011-08-02 08:48:22 +0200 | [diff] [blame] | 333 | case AD5933_OUT_RANGE: |
| 334 | len = sprintf(buf, "%d\n", |
| 335 | st->range_avail[(st->ctrl_hb >> 1) & 0x3]); |
| 336 | break; |
| 337 | case AD5933_OUT_RANGE_AVAIL: |
| 338 | len = sprintf(buf, "%d %d %d %d\n", st->range_avail[0], |
| 339 | st->range_avail[3], st->range_avail[2], |
| 340 | st->range_avail[1]); |
| 341 | break; |
| 342 | case AD5933_OUT_SETTLING_CYCLES: |
| 343 | len = sprintf(buf, "%d\n", st->settling_cycles); |
| 344 | break; |
| 345 | case AD5933_IN_PGA_GAIN: |
| 346 | len = sprintf(buf, "%s\n", |
| 347 | (st->ctrl_hb & AD5933_CTRL_PGA_GAIN_1) ? |
| 348 | "1" : "0.2"); |
| 349 | break; |
| 350 | case AD5933_IN_PGA_GAIN_AVAIL: |
| 351 | len = sprintf(buf, "1 0.2\n"); |
| 352 | break; |
| 353 | case AD5933_FREQ_POINTS: |
| 354 | len = sprintf(buf, "%d\n", st->freq_points); |
| 355 | break; |
| 356 | default: |
| 357 | ret = -EINVAL; |
| 358 | } |
| 359 | |
Jonathan Cameron | 638e59f | 2011-10-06 17:14:38 +0100 | [diff] [blame] | 360 | mutex_unlock(&indio_dev->mlock); |
Michael Hennerich | f94aa35 | 2011-08-02 08:48:22 +0200 | [diff] [blame] | 361 | return ret ? ret : len; |
| 362 | } |
| 363 | |
| 364 | static ssize_t ad5933_store(struct device *dev, |
| 365 | struct device_attribute *attr, |
| 366 | const char *buf, |
| 367 | size_t len) |
| 368 | { |
Jonathan Cameron | 638e59f | 2011-10-06 17:14:38 +0100 | [diff] [blame] | 369 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| 370 | struct ad5933_state *st = iio_priv(indio_dev); |
Michael Hennerich | f94aa35 | 2011-08-02 08:48:22 +0200 | [diff] [blame] | 371 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
| 372 | long val; |
| 373 | int i, ret = 0; |
| 374 | unsigned short dat; |
| 375 | |
| 376 | if (this_attr->address != AD5933_IN_PGA_GAIN) { |
| 377 | ret = strict_strtol(buf, 10, &val); |
| 378 | if (ret) |
| 379 | return ret; |
| 380 | } |
| 381 | |
Jonathan Cameron | 638e59f | 2011-10-06 17:14:38 +0100 | [diff] [blame] | 382 | mutex_lock(&indio_dev->mlock); |
Michael Hennerich | e15fbc9 | 2011-10-25 10:51:04 +0200 | [diff] [blame] | 383 | switch ((u32) this_attr->address) { |
Michael Hennerich | f94aa35 | 2011-08-02 08:48:22 +0200 | [diff] [blame] | 384 | case AD5933_OUT_RANGE: |
| 385 | for (i = 0; i < 4; i++) |
| 386 | if (val == st->range_avail[i]) { |
| 387 | st->ctrl_hb &= ~AD5933_CTRL_RANGE(0x3); |
| 388 | st->ctrl_hb |= AD5933_CTRL_RANGE(i); |
| 389 | ret = ad5933_cmd(st, 0); |
| 390 | break; |
| 391 | } |
| 392 | ret = -EINVAL; |
| 393 | break; |
| 394 | case AD5933_IN_PGA_GAIN: |
| 395 | if (sysfs_streq(buf, "1")) { |
| 396 | st->ctrl_hb |= AD5933_CTRL_PGA_GAIN_1; |
| 397 | } else if (sysfs_streq(buf, "0.2")) { |
| 398 | st->ctrl_hb &= ~AD5933_CTRL_PGA_GAIN_1; |
| 399 | } else { |
| 400 | ret = -EINVAL; |
| 401 | break; |
| 402 | } |
| 403 | ret = ad5933_cmd(st, 0); |
| 404 | break; |
| 405 | case AD5933_OUT_SETTLING_CYCLES: |
| 406 | val = clamp(val, 0L, 0x7FFL); |
| 407 | st->settling_cycles = val; |
| 408 | |
| 409 | /* 2x, 4x handling, see datasheet */ |
| 410 | if (val > 511) |
| 411 | val = (val >> 1) | (1 << 9); |
| 412 | else if (val > 1022) |
| 413 | val = (val >> 2) | (3 << 9); |
| 414 | |
| 415 | dat = cpu_to_be16(val); |
| 416 | ret = ad5933_i2c_write(st->client, |
| 417 | AD5933_REG_SETTLING_CYCLES, 2, (u8 *)&dat); |
| 418 | break; |
| 419 | case AD5933_FREQ_POINTS: |
| 420 | val = clamp(val, 0L, 511L); |
| 421 | st->freq_points = val; |
| 422 | |
| 423 | dat = cpu_to_be16(val); |
| 424 | ret = ad5933_i2c_write(st->client, AD5933_REG_INC_NUM, 2, |
| 425 | (u8 *)&dat); |
| 426 | break; |
| 427 | default: |
| 428 | ret = -EINVAL; |
| 429 | } |
| 430 | |
Jonathan Cameron | 638e59f | 2011-10-06 17:14:38 +0100 | [diff] [blame] | 431 | mutex_unlock(&indio_dev->mlock); |
Michael Hennerich | f94aa35 | 2011-08-02 08:48:22 +0200 | [diff] [blame] | 432 | return ret ? ret : len; |
| 433 | } |
| 434 | |
Jonathan Cameron | 322c956 | 2011-09-14 13:01:23 +0100 | [diff] [blame] | 435 | static IIO_DEVICE_ATTR(out_voltage0_scale, S_IRUGO | S_IWUSR, |
Michael Hennerich | f94aa35 | 2011-08-02 08:48:22 +0200 | [diff] [blame] | 436 | ad5933_show, |
| 437 | ad5933_store, |
| 438 | AD5933_OUT_RANGE); |
| 439 | |
Jonathan Cameron | 322c956 | 2011-09-14 13:01:23 +0100 | [diff] [blame] | 440 | static IIO_DEVICE_ATTR(out_voltage0_scale_available, S_IRUGO, |
Michael Hennerich | f94aa35 | 2011-08-02 08:48:22 +0200 | [diff] [blame] | 441 | ad5933_show, |
| 442 | NULL, |
| 443 | AD5933_OUT_RANGE_AVAIL); |
| 444 | |
Jonathan Cameron | 322c956 | 2011-09-14 13:01:23 +0100 | [diff] [blame] | 445 | static IIO_DEVICE_ATTR(in_voltage0_scale, S_IRUGO | S_IWUSR, |
Michael Hennerich | f94aa35 | 2011-08-02 08:48:22 +0200 | [diff] [blame] | 446 | ad5933_show, |
| 447 | ad5933_store, |
| 448 | AD5933_IN_PGA_GAIN); |
| 449 | |
Jonathan Cameron | 322c956 | 2011-09-14 13:01:23 +0100 | [diff] [blame] | 450 | static IIO_DEVICE_ATTR(in_voltage0_scale_available, S_IRUGO, |
Michael Hennerich | f94aa35 | 2011-08-02 08:48:22 +0200 | [diff] [blame] | 451 | ad5933_show, |
| 452 | NULL, |
| 453 | AD5933_IN_PGA_GAIN_AVAIL); |
| 454 | |
Jonathan Cameron | 322c956 | 2011-09-14 13:01:23 +0100 | [diff] [blame] | 455 | static IIO_DEVICE_ATTR(out_voltage0_freq_points, S_IRUGO | S_IWUSR, |
Michael Hennerich | f94aa35 | 2011-08-02 08:48:22 +0200 | [diff] [blame] | 456 | ad5933_show, |
| 457 | ad5933_store, |
| 458 | AD5933_FREQ_POINTS); |
| 459 | |
Jonathan Cameron | 322c956 | 2011-09-14 13:01:23 +0100 | [diff] [blame] | 460 | static IIO_DEVICE_ATTR(out_voltage0_settling_cycles, S_IRUGO | S_IWUSR, |
Michael Hennerich | f94aa35 | 2011-08-02 08:48:22 +0200 | [diff] [blame] | 461 | ad5933_show, |
| 462 | ad5933_store, |
| 463 | AD5933_OUT_SETTLING_CYCLES); |
| 464 | |
| 465 | /* note: |
| 466 | * ideally we would handle the scale attributes via the iio_info |
| 467 | * (read|write)_raw methods, however this part is a untypical since we |
| 468 | * don't create dedicated sysfs channel attributes for out0 and in0. |
| 469 | */ |
| 470 | static struct attribute *ad5933_attributes[] = { |
Jonathan Cameron | 322c956 | 2011-09-14 13:01:23 +0100 | [diff] [blame] | 471 | &iio_dev_attr_out_voltage0_scale.dev_attr.attr, |
| 472 | &iio_dev_attr_out_voltage0_scale_available.dev_attr.attr, |
| 473 | &iio_dev_attr_out_voltage0_freq_start.dev_attr.attr, |
| 474 | &iio_dev_attr_out_voltage0_freq_increment.dev_attr.attr, |
| 475 | &iio_dev_attr_out_voltage0_freq_points.dev_attr.attr, |
| 476 | &iio_dev_attr_out_voltage0_settling_cycles.dev_attr.attr, |
| 477 | &iio_dev_attr_in_voltage0_scale.dev_attr.attr, |
| 478 | &iio_dev_attr_in_voltage0_scale_available.dev_attr.attr, |
Michael Hennerich | f94aa35 | 2011-08-02 08:48:22 +0200 | [diff] [blame] | 479 | NULL |
| 480 | }; |
| 481 | |
| 482 | static const struct attribute_group ad5933_attribute_group = { |
| 483 | .attrs = ad5933_attributes, |
| 484 | }; |
| 485 | |
Jonathan Cameron | 638e59f | 2011-10-06 17:14:38 +0100 | [diff] [blame] | 486 | static int ad5933_read_raw(struct iio_dev *indio_dev, |
Michael Hennerich | f94aa35 | 2011-08-02 08:48:22 +0200 | [diff] [blame] | 487 | struct iio_chan_spec const *chan, |
| 488 | int *val, |
| 489 | int *val2, |
| 490 | long m) |
| 491 | { |
Jonathan Cameron | 638e59f | 2011-10-06 17:14:38 +0100 | [diff] [blame] | 492 | struct ad5933_state *st = iio_priv(indio_dev); |
Michael Hennerich | f94aa35 | 2011-08-02 08:48:22 +0200 | [diff] [blame] | 493 | unsigned short dat; |
| 494 | int ret = -EINVAL; |
| 495 | |
Jonathan Cameron | 638e59f | 2011-10-06 17:14:38 +0100 | [diff] [blame] | 496 | mutex_lock(&indio_dev->mlock); |
Michael Hennerich | f94aa35 | 2011-08-02 08:48:22 +0200 | [diff] [blame] | 497 | switch (m) { |
| 498 | case 0: |
Jonathan Cameron | 638e59f | 2011-10-06 17:14:38 +0100 | [diff] [blame] | 499 | if (iio_buffer_enabled(indio_dev)) { |
Michael Hennerich | f94aa35 | 2011-08-02 08:48:22 +0200 | [diff] [blame] | 500 | ret = -EBUSY; |
| 501 | goto out; |
| 502 | } |
| 503 | ret = ad5933_cmd(st, AD5933_CTRL_MEASURE_TEMP); |
| 504 | if (ret < 0) |
| 505 | goto out; |
| 506 | ret = ad5933_wait_busy(st, AD5933_STAT_TEMP_VALID); |
| 507 | if (ret < 0) |
| 508 | goto out; |
| 509 | |
| 510 | ret = ad5933_i2c_read(st->client, |
| 511 | AD5933_REG_TEMP_DATA, 2, |
| 512 | (u8 *)&dat); |
| 513 | if (ret < 0) |
| 514 | goto out; |
Jonathan Cameron | 638e59f | 2011-10-06 17:14:38 +0100 | [diff] [blame] | 515 | mutex_unlock(&indio_dev->mlock); |
Michael Hennerich | f94aa35 | 2011-08-02 08:48:22 +0200 | [diff] [blame] | 516 | ret = be16_to_cpu(dat); |
| 517 | /* Temp in Milli degrees Celsius */ |
| 518 | if (ret < 8192) |
| 519 | *val = ret * 1000 / 32; |
| 520 | else |
| 521 | *val = (ret - 16384) * 1000 / 32; |
| 522 | |
| 523 | return IIO_VAL_INT; |
| 524 | } |
| 525 | |
| 526 | out: |
Jonathan Cameron | 638e59f | 2011-10-06 17:14:38 +0100 | [diff] [blame] | 527 | mutex_unlock(&indio_dev->mlock); |
Michael Hennerich | f94aa35 | 2011-08-02 08:48:22 +0200 | [diff] [blame] | 528 | return ret; |
| 529 | } |
| 530 | |
| 531 | static const struct iio_info ad5933_info = { |
| 532 | .read_raw = &ad5933_read_raw, |
| 533 | .attrs = &ad5933_attribute_group, |
| 534 | .driver_module = THIS_MODULE, |
| 535 | }; |
| 536 | |
| 537 | static int ad5933_ring_preenable(struct iio_dev *indio_dev) |
| 538 | { |
| 539 | struct ad5933_state *st = iio_priv(indio_dev); |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 540 | struct iio_buffer *ring = indio_dev->buffer; |
Michael Hennerich | f94aa35 | 2011-08-02 08:48:22 +0200 | [diff] [blame] | 541 | size_t d_size; |
| 542 | int ret; |
| 543 | |
| 544 | if (!ring->scan_count) |
| 545 | return -EINVAL; |
| 546 | |
| 547 | d_size = ring->scan_count * |
| 548 | ad5933_channels[1].scan_type.storagebits / 8; |
| 549 | |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 550 | if (indio_dev->buffer->access->set_bytes_per_datum) |
| 551 | indio_dev->buffer->access-> |
| 552 | set_bytes_per_datum(indio_dev->buffer, d_size); |
Michael Hennerich | f94aa35 | 2011-08-02 08:48:22 +0200 | [diff] [blame] | 553 | |
| 554 | ret = ad5933_reset(st); |
| 555 | if (ret < 0) |
| 556 | return ret; |
| 557 | |
| 558 | ret = ad5933_cmd(st, AD5933_CTRL_STANDBY); |
| 559 | if (ret < 0) |
| 560 | return ret; |
| 561 | |
| 562 | ret = ad5933_cmd(st, AD5933_CTRL_INIT_START_FREQ); |
| 563 | if (ret < 0) |
| 564 | return ret; |
| 565 | |
| 566 | st->state = AD5933_CTRL_INIT_START_FREQ; |
| 567 | |
| 568 | return 0; |
| 569 | } |
| 570 | |
| 571 | static int ad5933_ring_postenable(struct iio_dev *indio_dev) |
| 572 | { |
| 573 | struct ad5933_state *st = iio_priv(indio_dev); |
| 574 | |
| 575 | /* AD5933_CTRL_INIT_START_FREQ: |
| 576 | * High Q complex circuits require a long time to reach steady state. |
| 577 | * To facilitate the measurement of such impedances, this mode allows |
| 578 | * the user full control of the settling time requirement before |
| 579 | * entering start frequency sweep mode where the impedance measurement |
| 580 | * takes place. In this mode the impedance is excited with the |
| 581 | * programmed start frequency (ad5933_ring_preenable), |
| 582 | * but no measurement takes place. |
| 583 | */ |
| 584 | |
| 585 | schedule_delayed_work(&st->work, |
| 586 | msecs_to_jiffies(AD5933_INIT_EXCITATION_TIME_ms)); |
| 587 | return 0; |
| 588 | } |
| 589 | |
| 590 | static int ad5933_ring_postdisable(struct iio_dev *indio_dev) |
| 591 | { |
| 592 | struct ad5933_state *st = iio_priv(indio_dev); |
| 593 | |
| 594 | cancel_delayed_work_sync(&st->work); |
| 595 | return ad5933_cmd(st, AD5933_CTRL_POWER_DOWN); |
| 596 | } |
| 597 | |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 598 | static const struct iio_buffer_setup_ops ad5933_ring_setup_ops = { |
Michael Hennerich | f94aa35 | 2011-08-02 08:48:22 +0200 | [diff] [blame] | 599 | .preenable = &ad5933_ring_preenable, |
| 600 | .postenable = &ad5933_ring_postenable, |
| 601 | .postdisable = &ad5933_ring_postdisable, |
| 602 | }; |
| 603 | |
| 604 | static int ad5933_register_ring_funcs_and_init(struct iio_dev *indio_dev) |
| 605 | { |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 606 | indio_dev->buffer = iio_sw_rb_allocate(indio_dev); |
| 607 | if (!indio_dev->buffer) |
Michael Hennerich | f94aa35 | 2011-08-02 08:48:22 +0200 | [diff] [blame] | 608 | return -ENOMEM; |
| 609 | |
| 610 | /* Effectively select the ring buffer implementation */ |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 611 | indio_dev->buffer->access = &ring_sw_access_funcs; |
Michael Hennerich | f94aa35 | 2011-08-02 08:48:22 +0200 | [diff] [blame] | 612 | |
| 613 | /* Ring buffer functions - here trigger setup related */ |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 614 | indio_dev->buffer->setup_ops = &ad5933_ring_setup_ops; |
Michael Hennerich | f94aa35 | 2011-08-02 08:48:22 +0200 | [diff] [blame] | 615 | |
Jonathan Cameron | ec3afa4 | 2011-09-21 11:15:54 +0100 | [diff] [blame] | 616 | indio_dev->modes |= INDIO_BUFFER_HARDWARE; |
Michael Hennerich | f94aa35 | 2011-08-02 08:48:22 +0200 | [diff] [blame] | 617 | |
| 618 | return 0; |
| 619 | } |
| 620 | |
| 621 | static void ad5933_work(struct work_struct *work) |
| 622 | { |
| 623 | struct ad5933_state *st = container_of(work, |
| 624 | struct ad5933_state, work.work); |
| 625 | struct iio_dev *indio_dev = i2c_get_clientdata(st->client); |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 626 | struct iio_buffer *ring = indio_dev->buffer; |
Michael Hennerich | f94aa35 | 2011-08-02 08:48:22 +0200 | [diff] [blame] | 627 | signed short buf[2]; |
| 628 | unsigned char status; |
| 629 | |
| 630 | mutex_lock(&indio_dev->mlock); |
| 631 | if (st->state == AD5933_CTRL_INIT_START_FREQ) { |
| 632 | /* start sweep */ |
| 633 | ad5933_cmd(st, AD5933_CTRL_START_SWEEP); |
| 634 | st->state = AD5933_CTRL_START_SWEEP; |
| 635 | schedule_delayed_work(&st->work, st->poll_time_jiffies); |
| 636 | mutex_unlock(&indio_dev->mlock); |
| 637 | return; |
| 638 | } |
| 639 | |
| 640 | ad5933_i2c_read(st->client, AD5933_REG_STATUS, 1, &status); |
| 641 | |
| 642 | if (status & AD5933_STAT_DATA_VALID) { |
| 643 | ad5933_i2c_read(st->client, |
Jonathan Cameron | 32b5eec | 2011-09-02 17:14:38 +0100 | [diff] [blame] | 644 | test_bit(1, ring->scan_mask) ? |
Michael Hennerich | f94aa35 | 2011-08-02 08:48:22 +0200 | [diff] [blame] | 645 | AD5933_REG_REAL_DATA : AD5933_REG_IMAG_DATA, |
| 646 | ring->scan_count * 2, (u8 *)buf); |
| 647 | |
| 648 | if (ring->scan_count == 2) { |
| 649 | buf[0] = be16_to_cpu(buf[0]); |
| 650 | buf[1] = be16_to_cpu(buf[1]); |
| 651 | } else { |
| 652 | buf[0] = be16_to_cpu(buf[0]); |
| 653 | } |
| 654 | /* save datum to the ring */ |
| 655 | ring->access->store_to(ring, (u8 *)buf, iio_get_time_ns()); |
| 656 | } else { |
| 657 | /* no data available - try again later */ |
| 658 | schedule_delayed_work(&st->work, st->poll_time_jiffies); |
| 659 | mutex_unlock(&indio_dev->mlock); |
| 660 | return; |
| 661 | } |
| 662 | |
| 663 | if (status & AD5933_STAT_SWEEP_DONE) { |
| 664 | /* last sample received - power down do nothing until |
| 665 | * the ring enable is toggled */ |
| 666 | ad5933_cmd(st, AD5933_CTRL_POWER_DOWN); |
| 667 | } else { |
| 668 | /* we just received a valid datum, move on to the next */ |
| 669 | ad5933_cmd(st, AD5933_CTRL_INC_FREQ); |
| 670 | schedule_delayed_work(&st->work, st->poll_time_jiffies); |
| 671 | } |
| 672 | |
| 673 | mutex_unlock(&indio_dev->mlock); |
| 674 | } |
| 675 | |
| 676 | static int __devinit ad5933_probe(struct i2c_client *client, |
| 677 | const struct i2c_device_id *id) |
| 678 | { |
Jonathan Cameron | 26d25ae | 2011-09-02 17:14:40 +0100 | [diff] [blame] | 679 | int ret, voltage_uv = 0; |
Michael Hennerich | f94aa35 | 2011-08-02 08:48:22 +0200 | [diff] [blame] | 680 | struct ad5933_platform_data *pdata = client->dev.platform_data; |
| 681 | struct ad5933_state *st; |
| 682 | struct iio_dev *indio_dev = iio_allocate_device(sizeof(*st)); |
| 683 | if (indio_dev == NULL) |
| 684 | return -ENOMEM; |
| 685 | |
| 686 | st = iio_priv(indio_dev); |
| 687 | i2c_set_clientdata(client, indio_dev); |
| 688 | st->client = client; |
| 689 | |
| 690 | if (!pdata) |
| 691 | st->pdata = &ad5933_default_pdata; |
| 692 | else |
| 693 | st->pdata = pdata; |
| 694 | |
| 695 | st->reg = regulator_get(&client->dev, "vcc"); |
| 696 | if (!IS_ERR(st->reg)) { |
| 697 | ret = regulator_enable(st->reg); |
| 698 | if (ret) |
| 699 | goto error_put_reg; |
| 700 | voltage_uv = regulator_get_voltage(st->reg); |
| 701 | } |
| 702 | |
| 703 | if (voltage_uv) |
| 704 | st->vref_mv = voltage_uv / 1000; |
| 705 | else |
| 706 | st->vref_mv = st->pdata->vref_mv; |
| 707 | |
| 708 | if (st->pdata->ext_clk_Hz) { |
| 709 | st->mclk_hz = st->pdata->ext_clk_Hz; |
| 710 | st->ctrl_lb = AD5933_CTRL_EXT_SYSCLK; |
| 711 | } else { |
| 712 | st->mclk_hz = AD5933_INT_OSC_FREQ_Hz; |
| 713 | st->ctrl_lb = AD5933_CTRL_INT_SYSCLK; |
| 714 | } |
| 715 | |
| 716 | ad5933_calc_out_ranges(st); |
| 717 | INIT_DELAYED_WORK(&st->work, ad5933_work); |
| 718 | st->poll_time_jiffies = msecs_to_jiffies(AD5933_POLL_TIME_ms); |
| 719 | |
| 720 | indio_dev->dev.parent = &client->dev; |
| 721 | indio_dev->info = &ad5933_info; |
| 722 | indio_dev->name = id->name; |
| 723 | indio_dev->modes = INDIO_DIRECT_MODE; |
| 724 | indio_dev->channels = ad5933_channels; |
| 725 | indio_dev->num_channels = 1; /* only register temp0_input */ |
| 726 | |
| 727 | ret = ad5933_register_ring_funcs_and_init(indio_dev); |
| 728 | if (ret) |
| 729 | goto error_disable_reg; |
| 730 | |
Michael Hennerich | f94aa35 | 2011-08-02 08:48:22 +0200 | [diff] [blame] | 731 | /* skip temp0_input, register in0_(real|imag)_raw */ |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 732 | ret = iio_buffer_register(indio_dev, &ad5933_channels[1], 2); |
Michael Hennerich | f94aa35 | 2011-08-02 08:48:22 +0200 | [diff] [blame] | 733 | if (ret) |
| 734 | goto error_unreg_ring; |
| 735 | |
| 736 | /* enable both REAL and IMAG channels by default */ |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 737 | iio_scan_mask_set(indio_dev->buffer, 0); |
| 738 | iio_scan_mask_set(indio_dev->buffer, 1); |
Michael Hennerich | f94aa35 | 2011-08-02 08:48:22 +0200 | [diff] [blame] | 739 | |
| 740 | ret = ad5933_setup(st); |
| 741 | if (ret) |
| 742 | goto error_uninitialize_ring; |
| 743 | |
Jonathan Cameron | 26d25ae | 2011-09-02 17:14:40 +0100 | [diff] [blame] | 744 | ret = iio_device_register(indio_dev); |
| 745 | if (ret) |
| 746 | goto error_uninitialize_ring; |
| 747 | |
Michael Hennerich | f94aa35 | 2011-08-02 08:48:22 +0200 | [diff] [blame] | 748 | return 0; |
| 749 | |
| 750 | error_uninitialize_ring: |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 751 | iio_buffer_unregister(indio_dev); |
Michael Hennerich | f94aa35 | 2011-08-02 08:48:22 +0200 | [diff] [blame] | 752 | error_unreg_ring: |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 753 | iio_sw_rb_free(indio_dev->buffer); |
Michael Hennerich | f94aa35 | 2011-08-02 08:48:22 +0200 | [diff] [blame] | 754 | error_disable_reg: |
| 755 | if (!IS_ERR(st->reg)) |
| 756 | regulator_disable(st->reg); |
| 757 | error_put_reg: |
| 758 | if (!IS_ERR(st->reg)) |
| 759 | regulator_put(st->reg); |
| 760 | |
Jonathan Cameron | 26d25ae | 2011-09-02 17:14:40 +0100 | [diff] [blame] | 761 | iio_free_device(indio_dev); |
Michael Hennerich | f94aa35 | 2011-08-02 08:48:22 +0200 | [diff] [blame] | 762 | |
| 763 | return ret; |
| 764 | } |
| 765 | |
| 766 | static __devexit int ad5933_remove(struct i2c_client *client) |
| 767 | { |
| 768 | struct iio_dev *indio_dev = i2c_get_clientdata(client); |
| 769 | struct ad5933_state *st = iio_priv(indio_dev); |
| 770 | |
Jonathan Cameron | d2fffd6 | 2011-10-14 14:46:58 +0100 | [diff] [blame] | 771 | iio_device_unregister(indio_dev); |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 772 | iio_buffer_unregister(indio_dev); |
| 773 | iio_sw_rb_free(indio_dev->buffer); |
Michael Hennerich | f94aa35 | 2011-08-02 08:48:22 +0200 | [diff] [blame] | 774 | if (!IS_ERR(st->reg)) { |
| 775 | regulator_disable(st->reg); |
| 776 | regulator_put(st->reg); |
| 777 | } |
Jonathan Cameron | d2fffd6 | 2011-10-14 14:46:58 +0100 | [diff] [blame] | 778 | iio_free_device(indio_dev); |
Michael Hennerich | f94aa35 | 2011-08-02 08:48:22 +0200 | [diff] [blame] | 779 | |
| 780 | return 0; |
| 781 | } |
| 782 | |
| 783 | static const struct i2c_device_id ad5933_id[] = { |
| 784 | { "ad5933", 0 }, |
| 785 | { "ad5934", 0 }, |
| 786 | {} |
| 787 | }; |
| 788 | |
| 789 | MODULE_DEVICE_TABLE(i2c, ad5933_id); |
| 790 | |
| 791 | static struct i2c_driver ad5933_driver = { |
| 792 | .driver = { |
| 793 | .name = "ad5933", |
| 794 | }, |
| 795 | .probe = ad5933_probe, |
| 796 | .remove = __devexit_p(ad5933_remove), |
| 797 | .id_table = ad5933_id, |
| 798 | }; |
| 799 | |
| 800 | static __init int ad5933_init(void) |
| 801 | { |
| 802 | return i2c_add_driver(&ad5933_driver); |
| 803 | } |
| 804 | module_init(ad5933_init); |
| 805 | |
| 806 | static __exit void ad5933_exit(void) |
| 807 | { |
| 808 | i2c_del_driver(&ad5933_driver); |
| 809 | } |
| 810 | module_exit(ad5933_exit); |
| 811 | |
| 812 | MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); |
| 813 | MODULE_DESCRIPTION("Analog Devices AD5933 Impedance Conv. Network Analyzer"); |
| 814 | MODULE_LICENSE("GPL v2"); |