Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 1 | /* |
| 2 | * AD7606 SPI ADC driver |
| 3 | * |
| 4 | * Copyright 2011 Analog Devices Inc. |
| 5 | * |
| 6 | * Licensed under the GPL-2. |
| 7 | */ |
| 8 | |
| 9 | #include <linux/interrupt.h> |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 10 | #include <linux/device.h> |
| 11 | #include <linux/kernel.h> |
| 12 | #include <linux/slab.h> |
| 13 | #include <linux/sysfs.h> |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 14 | #include <linux/regulator/consumer.h> |
| 15 | #include <linux/err.h> |
| 16 | #include <linux/gpio.h> |
| 17 | #include <linux/delay.h> |
| 18 | #include <linux/sched.h> |
Paul Gortmaker | 99c9785 | 2011-07-03 15:49:50 -0400 | [diff] [blame] | 19 | #include <linux/module.h> |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 20 | |
| 21 | #include "../iio.h" |
| 22 | #include "../sysfs.h" |
| 23 | #include "../ring_generic.h" |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 24 | |
| 25 | #include "ad7606.h" |
| 26 | |
| 27 | int ad7606_reset(struct ad7606_state *st) |
| 28 | { |
| 29 | if (st->have_reset) { |
| 30 | gpio_set_value(st->pdata->gpio_reset, 1); |
| 31 | ndelay(100); /* t_reset >= 100ns */ |
| 32 | gpio_set_value(st->pdata->gpio_reset, 0); |
| 33 | return 0; |
| 34 | } |
| 35 | |
| 36 | return -ENODEV; |
| 37 | } |
| 38 | |
Michael Hennerich | 44039a6 | 2011-05-18 14:42:28 +0100 | [diff] [blame] | 39 | static int ad7606_scan_direct(struct iio_dev *indio_dev, unsigned ch) |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 40 | { |
Michael Hennerich | 44039a6 | 2011-05-18 14:42:28 +0100 | [diff] [blame] | 41 | struct ad7606_state *st = iio_priv(indio_dev); |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 42 | int ret; |
| 43 | |
| 44 | st->done = false; |
| 45 | gpio_set_value(st->pdata->gpio_convst, 1); |
| 46 | |
| 47 | ret = wait_event_interruptible(st->wq_data_avail, st->done); |
| 48 | if (ret) |
| 49 | goto error_ret; |
| 50 | |
| 51 | if (st->have_frstdata) { |
| 52 | ret = st->bops->read_block(st->dev, 1, st->data); |
| 53 | if (ret) |
| 54 | goto error_ret; |
| 55 | if (!gpio_get_value(st->pdata->gpio_frstdata)) { |
| 56 | /* This should never happen */ |
| 57 | ad7606_reset(st); |
| 58 | ret = -EIO; |
| 59 | goto error_ret; |
| 60 | } |
| 61 | ret = st->bops->read_block(st->dev, |
| 62 | st->chip_info->num_channels - 1, &st->data[1]); |
| 63 | if (ret) |
| 64 | goto error_ret; |
| 65 | } else { |
| 66 | ret = st->bops->read_block(st->dev, |
| 67 | st->chip_info->num_channels, st->data); |
| 68 | if (ret) |
| 69 | goto error_ret; |
| 70 | } |
| 71 | |
| 72 | ret = st->data[ch]; |
| 73 | |
| 74 | error_ret: |
| 75 | gpio_set_value(st->pdata->gpio_convst, 0); |
| 76 | |
| 77 | return ret; |
| 78 | } |
| 79 | |
Michael Hennerich | b9c4451 | 2011-05-18 14:42:27 +0100 | [diff] [blame] | 80 | static int ad7606_read_raw(struct iio_dev *indio_dev, |
Michael Hennerich | 1caf7cb | 2011-05-18 14:42:00 +0100 | [diff] [blame] | 81 | struct iio_chan_spec const *chan, |
| 82 | int *val, |
| 83 | int *val2, |
| 84 | long m) |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 85 | { |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 86 | int ret; |
Michael Hennerich | 44039a6 | 2011-05-18 14:42:28 +0100 | [diff] [blame] | 87 | struct ad7606_state *st = iio_priv(indio_dev); |
Michael Hennerich | 1caf7cb | 2011-05-18 14:42:00 +0100 | [diff] [blame] | 88 | unsigned int scale_uv; |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 89 | |
Michael Hennerich | 1caf7cb | 2011-05-18 14:42:00 +0100 | [diff] [blame] | 90 | switch (m) { |
| 91 | case 0: |
Michael Hennerich | b9c4451 | 2011-05-18 14:42:27 +0100 | [diff] [blame] | 92 | mutex_lock(&indio_dev->mlock); |
| 93 | if (iio_ring_enabled(indio_dev)) |
Michael Hennerich | 44039a6 | 2011-05-18 14:42:28 +0100 | [diff] [blame] | 94 | ret = ad7606_scan_from_ring(indio_dev, chan->address); |
Michael Hennerich | 1caf7cb | 2011-05-18 14:42:00 +0100 | [diff] [blame] | 95 | else |
Michael Hennerich | 44039a6 | 2011-05-18 14:42:28 +0100 | [diff] [blame] | 96 | ret = ad7606_scan_direct(indio_dev, chan->address); |
Michael Hennerich | b9c4451 | 2011-05-18 14:42:27 +0100 | [diff] [blame] | 97 | mutex_unlock(&indio_dev->mlock); |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 98 | |
Michael Hennerich | 1caf7cb | 2011-05-18 14:42:00 +0100 | [diff] [blame] | 99 | if (ret < 0) |
| 100 | return ret; |
| 101 | *val = (short) ret; |
| 102 | return IIO_VAL_INT; |
| 103 | case (1 << IIO_CHAN_INFO_SCALE_SHARED): |
| 104 | scale_uv = (st->range * 1000 * 2) |
| 105 | >> st->chip_info->channels[0].scan_type.realbits; |
| 106 | *val = scale_uv / 1000; |
| 107 | *val2 = (scale_uv % 1000) * 1000; |
| 108 | return IIO_VAL_INT_PLUS_MICRO; |
| 109 | } |
| 110 | return -EINVAL; |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 111 | } |
| 112 | |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 113 | static ssize_t ad7606_show_range(struct device *dev, |
| 114 | struct device_attribute *attr, char *buf) |
| 115 | { |
Michael Hennerich | b9c4451 | 2011-05-18 14:42:27 +0100 | [diff] [blame] | 116 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
Michael Hennerich | 44039a6 | 2011-05-18 14:42:28 +0100 | [diff] [blame] | 117 | struct ad7606_state *st = iio_priv(indio_dev); |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 118 | |
| 119 | return sprintf(buf, "%u\n", st->range); |
| 120 | } |
| 121 | |
| 122 | static ssize_t ad7606_store_range(struct device *dev, |
| 123 | struct device_attribute *attr, const char *buf, size_t count) |
| 124 | { |
Michael Hennerich | b9c4451 | 2011-05-18 14:42:27 +0100 | [diff] [blame] | 125 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
Michael Hennerich | 44039a6 | 2011-05-18 14:42:28 +0100 | [diff] [blame] | 126 | struct ad7606_state *st = iio_priv(indio_dev); |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 127 | unsigned long lval; |
| 128 | |
| 129 | if (strict_strtoul(buf, 10, &lval)) |
| 130 | return -EINVAL; |
| 131 | if (!(lval == 5000 || lval == 10000)) { |
| 132 | dev_err(dev, "range is not supported\n"); |
| 133 | return -EINVAL; |
| 134 | } |
Michael Hennerich | b9c4451 | 2011-05-18 14:42:27 +0100 | [diff] [blame] | 135 | mutex_lock(&indio_dev->mlock); |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 136 | gpio_set_value(st->pdata->gpio_range, lval == 10000); |
| 137 | st->range = lval; |
Michael Hennerich | b9c4451 | 2011-05-18 14:42:27 +0100 | [diff] [blame] | 138 | mutex_unlock(&indio_dev->mlock); |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 139 | |
| 140 | return count; |
| 141 | } |
| 142 | |
Jonathan Cameron | cedd1a1 | 2011-09-14 13:01:24 +0100 | [diff] [blame^] | 143 | static IIO_DEVICE_ATTR(in_voltage_range, S_IRUGO | S_IWUSR, \ |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 144 | ad7606_show_range, ad7606_store_range, 0); |
Jonathan Cameron | cedd1a1 | 2011-09-14 13:01:24 +0100 | [diff] [blame^] | 145 | static IIO_CONST_ATTR(in_voltage_range_available, "5000 10000"); |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 146 | |
| 147 | static ssize_t ad7606_show_oversampling_ratio(struct device *dev, |
| 148 | struct device_attribute *attr, char *buf) |
| 149 | { |
Michael Hennerich | b9c4451 | 2011-05-18 14:42:27 +0100 | [diff] [blame] | 150 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
Michael Hennerich | 44039a6 | 2011-05-18 14:42:28 +0100 | [diff] [blame] | 151 | struct ad7606_state *st = iio_priv(indio_dev); |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 152 | |
| 153 | return sprintf(buf, "%u\n", st->oversampling); |
| 154 | } |
| 155 | |
| 156 | static int ad7606_oversampling_get_index(unsigned val) |
| 157 | { |
| 158 | unsigned char supported[] = {0, 2, 4, 8, 16, 32, 64}; |
| 159 | int i; |
| 160 | |
| 161 | for (i = 0; i < ARRAY_SIZE(supported); i++) |
| 162 | if (val == supported[i]) |
| 163 | return i; |
| 164 | |
| 165 | return -EINVAL; |
| 166 | } |
| 167 | |
| 168 | static ssize_t ad7606_store_oversampling_ratio(struct device *dev, |
| 169 | struct device_attribute *attr, const char *buf, size_t count) |
| 170 | { |
Michael Hennerich | b9c4451 | 2011-05-18 14:42:27 +0100 | [diff] [blame] | 171 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
Michael Hennerich | 44039a6 | 2011-05-18 14:42:28 +0100 | [diff] [blame] | 172 | struct ad7606_state *st = iio_priv(indio_dev); |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 173 | unsigned long lval; |
| 174 | int ret; |
| 175 | |
| 176 | if (strict_strtoul(buf, 10, &lval)) |
| 177 | return -EINVAL; |
| 178 | |
| 179 | ret = ad7606_oversampling_get_index(lval); |
| 180 | if (ret < 0) { |
| 181 | dev_err(dev, "oversampling %lu is not supported\n", lval); |
| 182 | return ret; |
| 183 | } |
| 184 | |
Michael Hennerich | b9c4451 | 2011-05-18 14:42:27 +0100 | [diff] [blame] | 185 | mutex_lock(&indio_dev->mlock); |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 186 | gpio_set_value(st->pdata->gpio_os0, (ret >> 0) & 1); |
| 187 | gpio_set_value(st->pdata->gpio_os1, (ret >> 1) & 1); |
| 188 | gpio_set_value(st->pdata->gpio_os1, (ret >> 2) & 1); |
| 189 | st->oversampling = lval; |
Michael Hennerich | b9c4451 | 2011-05-18 14:42:27 +0100 | [diff] [blame] | 190 | mutex_unlock(&indio_dev->mlock); |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 191 | |
| 192 | return count; |
| 193 | } |
| 194 | |
| 195 | static IIO_DEVICE_ATTR(oversampling_ratio, S_IRUGO | S_IWUSR, |
| 196 | ad7606_show_oversampling_ratio, |
| 197 | ad7606_store_oversampling_ratio, 0); |
| 198 | static IIO_CONST_ATTR(oversampling_ratio_available, "0 2 4 8 16 32 64"); |
| 199 | |
| 200 | static struct attribute *ad7606_attributes[] = { |
Jonathan Cameron | cedd1a1 | 2011-09-14 13:01:24 +0100 | [diff] [blame^] | 201 | &iio_dev_attr_in_voltage_range.dev_attr.attr, |
| 202 | &iio_const_attr_in_voltage_range_available.dev_attr.attr, |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 203 | &iio_dev_attr_oversampling_ratio.dev_attr.attr, |
| 204 | &iio_const_attr_oversampling_ratio_available.dev_attr.attr, |
| 205 | NULL, |
| 206 | }; |
| 207 | |
| 208 | static mode_t ad7606_attr_is_visible(struct kobject *kobj, |
| 209 | struct attribute *attr, int n) |
| 210 | { |
| 211 | struct device *dev = container_of(kobj, struct device, kobj); |
Michael Hennerich | b9c4451 | 2011-05-18 14:42:27 +0100 | [diff] [blame] | 212 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
Michael Hennerich | 44039a6 | 2011-05-18 14:42:28 +0100 | [diff] [blame] | 213 | struct ad7606_state *st = iio_priv(indio_dev); |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 214 | |
| 215 | mode_t mode = attr->mode; |
| 216 | |
Michael Hennerich | 1caf7cb | 2011-05-18 14:42:00 +0100 | [diff] [blame] | 217 | if (!st->have_os && |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 218 | (attr == &iio_dev_attr_oversampling_ratio.dev_attr.attr || |
| 219 | attr == |
| 220 | &iio_const_attr_oversampling_ratio_available.dev_attr.attr)) |
| 221 | mode = 0; |
| 222 | else if (!st->have_range && |
Jonathan Cameron | cedd1a1 | 2011-09-14 13:01:24 +0100 | [diff] [blame^] | 223 | (attr == &iio_dev_attr_in_voltage_range.dev_attr.attr || |
| 224 | attr == |
| 225 | &iio_const_attr_in_voltage_range_available.dev_attr.attr)) |
| 226 | mode = 0; |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 227 | |
| 228 | return mode; |
| 229 | } |
| 230 | |
| 231 | static const struct attribute_group ad7606_attribute_group = { |
| 232 | .attrs = ad7606_attributes, |
| 233 | .is_visible = ad7606_attr_is_visible, |
| 234 | }; |
| 235 | |
Michael Hennerich | 1caf7cb | 2011-05-18 14:42:00 +0100 | [diff] [blame] | 236 | static struct iio_chan_spec ad7606_8_channels[] = { |
| 237 | IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 0, 0, |
| 238 | (1 << IIO_CHAN_INFO_SCALE_SHARED), |
| 239 | 0, 0, IIO_ST('s', 16, 16, 0), 0), |
| 240 | IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 1, 0, |
| 241 | (1 << IIO_CHAN_INFO_SCALE_SHARED), |
| 242 | 1, 1, IIO_ST('s', 16, 16, 0), 0), |
| 243 | IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 2, 0, |
| 244 | (1 << IIO_CHAN_INFO_SCALE_SHARED), |
| 245 | 2, 2, IIO_ST('s', 16, 16, 0), 0), |
| 246 | IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 3, 0, |
| 247 | (1 << IIO_CHAN_INFO_SCALE_SHARED), |
| 248 | 3, 3, IIO_ST('s', 16, 16, 0), 0), |
| 249 | IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 4, 0, |
| 250 | (1 << IIO_CHAN_INFO_SCALE_SHARED), |
| 251 | 4, 4, IIO_ST('s', 16, 16, 0), 0), |
| 252 | IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 5, 0, |
| 253 | (1 << IIO_CHAN_INFO_SCALE_SHARED), |
| 254 | 5, 5, IIO_ST('s', 16, 16, 0), 0), |
| 255 | IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 6, 0, |
| 256 | (1 << IIO_CHAN_INFO_SCALE_SHARED), |
| 257 | 6, 6, IIO_ST('s', 16, 16, 0), 0), |
| 258 | IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 7, 0, |
| 259 | (1 << IIO_CHAN_INFO_SCALE_SHARED), |
| 260 | 7, 7, IIO_ST('s', 16, 16, 0), 0), |
| 261 | IIO_CHAN_SOFT_TIMESTAMP(8), |
| 262 | }; |
| 263 | |
| 264 | static struct iio_chan_spec ad7606_6_channels[] = { |
| 265 | IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 0, 0, |
| 266 | (1 << IIO_CHAN_INFO_SCALE_SHARED), |
| 267 | 0, 0, IIO_ST('s', 16, 16, 0), 0), |
| 268 | IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 1, 0, |
| 269 | (1 << IIO_CHAN_INFO_SCALE_SHARED), |
| 270 | 1, 1, IIO_ST('s', 16, 16, 0), 0), |
| 271 | IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 2, 0, |
| 272 | (1 << IIO_CHAN_INFO_SCALE_SHARED), |
| 273 | 2, 2, IIO_ST('s', 16, 16, 0), 0), |
| 274 | IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 3, 0, |
| 275 | (1 << IIO_CHAN_INFO_SCALE_SHARED), |
| 276 | 3, 3, IIO_ST('s', 16, 16, 0), 0), |
| 277 | IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 4, 0, |
| 278 | (1 << IIO_CHAN_INFO_SCALE_SHARED), |
| 279 | 4, 4, IIO_ST('s', 16, 16, 0), 0), |
| 280 | IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 5, 0, |
| 281 | (1 << IIO_CHAN_INFO_SCALE_SHARED), |
| 282 | 5, 5, IIO_ST('s', 16, 16, 0), 0), |
| 283 | IIO_CHAN_SOFT_TIMESTAMP(6), |
| 284 | }; |
| 285 | |
| 286 | static struct iio_chan_spec ad7606_4_channels[] = { |
| 287 | IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 0, 0, |
| 288 | (1 << IIO_CHAN_INFO_SCALE_SHARED), |
| 289 | 0, 0, IIO_ST('s', 16, 16, 0), 0), |
| 290 | IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 1, 0, |
| 291 | (1 << IIO_CHAN_INFO_SCALE_SHARED), |
| 292 | 1, 1, IIO_ST('s', 16, 16, 0), 0), |
| 293 | IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 2, 0, |
| 294 | (1 << IIO_CHAN_INFO_SCALE_SHARED), |
| 295 | 2, 2, IIO_ST('s', 16, 16, 0), 0), |
| 296 | IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 3, 0, |
| 297 | (1 << IIO_CHAN_INFO_SCALE_SHARED), |
| 298 | 3, 3, IIO_ST('s', 16, 16, 0), 0), |
| 299 | IIO_CHAN_SOFT_TIMESTAMP(4), |
| 300 | }; |
| 301 | |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 302 | static const struct ad7606_chip_info ad7606_chip_info_tbl[] = { |
| 303 | /* |
| 304 | * More devices added in future |
| 305 | */ |
| 306 | [ID_AD7606_8] = { |
| 307 | .name = "ad7606", |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 308 | .int_vref_mv = 2500, |
Michael Hennerich | 1caf7cb | 2011-05-18 14:42:00 +0100 | [diff] [blame] | 309 | .channels = ad7606_8_channels, |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 310 | .num_channels = 8, |
| 311 | }, |
| 312 | [ID_AD7606_6] = { |
| 313 | .name = "ad7606-6", |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 314 | .int_vref_mv = 2500, |
Michael Hennerich | 1caf7cb | 2011-05-18 14:42:00 +0100 | [diff] [blame] | 315 | .channels = ad7606_6_channels, |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 316 | .num_channels = 6, |
| 317 | }, |
| 318 | [ID_AD7606_4] = { |
| 319 | .name = "ad7606-4", |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 320 | .int_vref_mv = 2500, |
Michael Hennerich | 1caf7cb | 2011-05-18 14:42:00 +0100 | [diff] [blame] | 321 | .channels = ad7606_4_channels, |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 322 | .num_channels = 4, |
| 323 | }, |
| 324 | }; |
| 325 | |
| 326 | static int ad7606_request_gpios(struct ad7606_state *st) |
| 327 | { |
| 328 | struct gpio gpio_array[3] = { |
| 329 | [0] = { |
| 330 | .gpio = st->pdata->gpio_os0, |
| 331 | .flags = GPIOF_DIR_OUT | ((st->oversampling & 1) ? |
| 332 | GPIOF_INIT_HIGH : GPIOF_INIT_LOW), |
| 333 | .label = "AD7606_OS0", |
| 334 | }, |
| 335 | [1] = { |
| 336 | .gpio = st->pdata->gpio_os1, |
| 337 | .flags = GPIOF_DIR_OUT | ((st->oversampling & 2) ? |
| 338 | GPIOF_INIT_HIGH : GPIOF_INIT_LOW), |
| 339 | .label = "AD7606_OS1", |
| 340 | }, |
| 341 | [2] = { |
| 342 | .gpio = st->pdata->gpio_os2, |
| 343 | .flags = GPIOF_DIR_OUT | ((st->oversampling & 4) ? |
| 344 | GPIOF_INIT_HIGH : GPIOF_INIT_LOW), |
| 345 | .label = "AD7606_OS2", |
| 346 | }, |
| 347 | }; |
| 348 | int ret; |
| 349 | |
| 350 | ret = gpio_request_one(st->pdata->gpio_convst, GPIOF_OUT_INIT_LOW, |
| 351 | "AD7606_CONVST"); |
| 352 | if (ret) { |
| 353 | dev_err(st->dev, "failed to request GPIO CONVST\n"); |
| 354 | return ret; |
| 355 | } |
| 356 | |
| 357 | ret = gpio_request_array(gpio_array, ARRAY_SIZE(gpio_array)); |
| 358 | if (!ret) { |
| 359 | st->have_os = true; |
| 360 | } |
| 361 | |
| 362 | ret = gpio_request_one(st->pdata->gpio_reset, GPIOF_OUT_INIT_LOW, |
| 363 | "AD7606_RESET"); |
| 364 | if (!ret) |
| 365 | st->have_reset = true; |
| 366 | |
| 367 | ret = gpio_request_one(st->pdata->gpio_range, GPIOF_DIR_OUT | |
Michael Hennerich | e61181d | 2011-05-18 14:42:01 +0100 | [diff] [blame] | 368 | ((st->range == 10000) ? GPIOF_INIT_HIGH : |
| 369 | GPIOF_INIT_LOW), "AD7606_RANGE"); |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 370 | if (!ret) |
| 371 | st->have_range = true; |
| 372 | |
| 373 | ret = gpio_request_one(st->pdata->gpio_stby, GPIOF_OUT_INIT_HIGH, |
| 374 | "AD7606_STBY"); |
| 375 | if (!ret) |
| 376 | st->have_stby = true; |
| 377 | |
| 378 | if (gpio_is_valid(st->pdata->gpio_frstdata)) { |
| 379 | ret = gpio_request_one(st->pdata->gpio_frstdata, GPIOF_IN, |
| 380 | "AD7606_FRSTDATA"); |
| 381 | if (!ret) |
| 382 | st->have_frstdata = true; |
| 383 | } |
| 384 | |
| 385 | return 0; |
| 386 | } |
| 387 | |
| 388 | static void ad7606_free_gpios(struct ad7606_state *st) |
| 389 | { |
| 390 | if (st->have_range) |
| 391 | gpio_free(st->pdata->gpio_range); |
| 392 | |
| 393 | if (st->have_stby) |
| 394 | gpio_free(st->pdata->gpio_stby); |
| 395 | |
| 396 | if (st->have_os) { |
| 397 | gpio_free(st->pdata->gpio_os0); |
| 398 | gpio_free(st->pdata->gpio_os1); |
| 399 | gpio_free(st->pdata->gpio_os2); |
| 400 | } |
| 401 | |
| 402 | if (st->have_reset) |
| 403 | gpio_free(st->pdata->gpio_reset); |
| 404 | |
| 405 | if (st->have_frstdata) |
| 406 | gpio_free(st->pdata->gpio_frstdata); |
| 407 | |
| 408 | gpio_free(st->pdata->gpio_convst); |
| 409 | } |
| 410 | |
| 411 | /** |
| 412 | * Interrupt handler |
| 413 | */ |
| 414 | static irqreturn_t ad7606_interrupt(int irq, void *dev_id) |
| 415 | { |
Michael Hennerich | e61181d | 2011-05-18 14:42:01 +0100 | [diff] [blame] | 416 | struct iio_dev *indio_dev = dev_id; |
| 417 | struct ad7606_state *st = iio_priv(indio_dev); |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 418 | |
Michael Hennerich | e61181d | 2011-05-18 14:42:01 +0100 | [diff] [blame] | 419 | if (iio_ring_enabled(indio_dev)) { |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 420 | if (!work_pending(&st->poll_work)) |
| 421 | schedule_work(&st->poll_work); |
| 422 | } else { |
| 423 | st->done = true; |
| 424 | wake_up_interruptible(&st->wq_data_avail); |
| 425 | } |
| 426 | |
| 427 | return IRQ_HANDLED; |
| 428 | }; |
| 429 | |
Jonathan Cameron | 6fe8135 | 2011-05-18 14:42:37 +0100 | [diff] [blame] | 430 | static const struct iio_info ad7606_info = { |
| 431 | .driver_module = THIS_MODULE, |
| 432 | .read_raw = &ad7606_read_raw, |
| 433 | .attrs = &ad7606_attribute_group, |
| 434 | }; |
| 435 | |
Michael Hennerich | e61181d | 2011-05-18 14:42:01 +0100 | [diff] [blame] | 436 | struct iio_dev *ad7606_probe(struct device *dev, int irq, |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 437 | void __iomem *base_address, |
| 438 | unsigned id, |
| 439 | const struct ad7606_bus_ops *bops) |
| 440 | { |
| 441 | struct ad7606_platform_data *pdata = dev->platform_data; |
| 442 | struct ad7606_state *st; |
Jonathan Cameron | 26d25ae | 2011-09-02 17:14:40 +0100 | [diff] [blame] | 443 | int ret; |
Michael Hennerich | e61181d | 2011-05-18 14:42:01 +0100 | [diff] [blame] | 444 | struct iio_dev *indio_dev = iio_allocate_device(sizeof(*st)); |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 445 | |
Michael Hennerich | e61181d | 2011-05-18 14:42:01 +0100 | [diff] [blame] | 446 | if (indio_dev == NULL) { |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 447 | ret = -ENOMEM; |
| 448 | goto error_ret; |
| 449 | } |
| 450 | |
Michael Hennerich | e61181d | 2011-05-18 14:42:01 +0100 | [diff] [blame] | 451 | st = iio_priv(indio_dev); |
| 452 | |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 453 | st->dev = dev; |
| 454 | st->id = id; |
| 455 | st->irq = irq; |
| 456 | st->bops = bops; |
| 457 | st->base_address = base_address; |
| 458 | st->range = pdata->default_range == 10000 ? 10000 : 5000; |
| 459 | |
| 460 | ret = ad7606_oversampling_get_index(pdata->default_os); |
| 461 | if (ret < 0) { |
| 462 | dev_warn(dev, "oversampling %d is not supported\n", |
| 463 | pdata->default_os); |
| 464 | st->oversampling = 0; |
| 465 | } else { |
| 466 | st->oversampling = pdata->default_os; |
| 467 | } |
| 468 | |
| 469 | st->reg = regulator_get(dev, "vcc"); |
| 470 | if (!IS_ERR(st->reg)) { |
| 471 | ret = regulator_enable(st->reg); |
| 472 | if (ret) |
| 473 | goto error_put_reg; |
| 474 | } |
| 475 | |
| 476 | st->pdata = pdata; |
| 477 | st->chip_info = &ad7606_chip_info_tbl[id]; |
| 478 | |
Michael Hennerich | e61181d | 2011-05-18 14:42:01 +0100 | [diff] [blame] | 479 | indio_dev->dev.parent = dev; |
Jonathan Cameron | 6fe8135 | 2011-05-18 14:42:37 +0100 | [diff] [blame] | 480 | indio_dev->info = &ad7606_info; |
Michael Hennerich | e61181d | 2011-05-18 14:42:01 +0100 | [diff] [blame] | 481 | indio_dev->modes = INDIO_DIRECT_MODE; |
| 482 | indio_dev->name = st->chip_info->name; |
| 483 | indio_dev->channels = st->chip_info->channels; |
| 484 | indio_dev->num_channels = st->chip_info->num_channels; |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 485 | |
| 486 | init_waitqueue_head(&st->wq_data_avail); |
| 487 | |
| 488 | ret = ad7606_request_gpios(st); |
| 489 | if (ret) |
Michael Hennerich | e61181d | 2011-05-18 14:42:01 +0100 | [diff] [blame] | 490 | goto error_disable_reg; |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 491 | |
| 492 | ret = ad7606_reset(st); |
| 493 | if (ret) |
| 494 | dev_warn(st->dev, "failed to RESET: no RESET GPIO specified\n"); |
| 495 | |
| 496 | ret = request_irq(st->irq, ad7606_interrupt, |
Michael Hennerich | e61181d | 2011-05-18 14:42:01 +0100 | [diff] [blame] | 497 | IRQF_TRIGGER_FALLING, st->chip_info->name, indio_dev); |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 498 | if (ret) |
| 499 | goto error_free_gpios; |
| 500 | |
Michael Hennerich | e61181d | 2011-05-18 14:42:01 +0100 | [diff] [blame] | 501 | ret = ad7606_register_ring_funcs_and_init(indio_dev); |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 502 | if (ret) |
| 503 | goto error_free_irq; |
| 504 | |
Jonathan Cameron | c009f7e | 2011-08-30 12:41:14 +0100 | [diff] [blame] | 505 | ret = iio_ring_buffer_register(indio_dev, |
| 506 | indio_dev->channels, |
| 507 | indio_dev->num_channels); |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 508 | if (ret) |
| 509 | goto error_cleanup_ring; |
Jonathan Cameron | 26d25ae | 2011-09-02 17:14:40 +0100 | [diff] [blame] | 510 | ret = iio_device_register(indio_dev); |
| 511 | if (ret) |
| 512 | goto error_unregister_ring; |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 513 | |
Michael Hennerich | e61181d | 2011-05-18 14:42:01 +0100 | [diff] [blame] | 514 | return indio_dev; |
Jonathan Cameron | 26d25ae | 2011-09-02 17:14:40 +0100 | [diff] [blame] | 515 | error_unregister_ring: |
| 516 | iio_ring_buffer_unregister(indio_dev); |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 517 | |
| 518 | error_cleanup_ring: |
Michael Hennerich | e61181d | 2011-05-18 14:42:01 +0100 | [diff] [blame] | 519 | ad7606_ring_cleanup(indio_dev); |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 520 | |
| 521 | error_free_irq: |
Michael Hennerich | e61181d | 2011-05-18 14:42:01 +0100 | [diff] [blame] | 522 | free_irq(st->irq, indio_dev); |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 523 | |
| 524 | error_free_gpios: |
| 525 | ad7606_free_gpios(st); |
| 526 | |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 527 | error_disable_reg: |
| 528 | if (!IS_ERR(st->reg)) |
| 529 | regulator_disable(st->reg); |
| 530 | error_put_reg: |
| 531 | if (!IS_ERR(st->reg)) |
| 532 | regulator_put(st->reg); |
Jonathan Cameron | 26d25ae | 2011-09-02 17:14:40 +0100 | [diff] [blame] | 533 | iio_free_device(indio_dev); |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 534 | error_ret: |
| 535 | return ERR_PTR(ret); |
| 536 | } |
| 537 | |
Michael Hennerich | e61181d | 2011-05-18 14:42:01 +0100 | [diff] [blame] | 538 | int ad7606_remove(struct iio_dev *indio_dev) |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 539 | { |
Michael Hennerich | e61181d | 2011-05-18 14:42:01 +0100 | [diff] [blame] | 540 | struct ad7606_state *st = iio_priv(indio_dev); |
| 541 | |
Jonathan Cameron | 1aa0427 | 2011-08-30 12:32:47 +0100 | [diff] [blame] | 542 | iio_ring_buffer_unregister(indio_dev); |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 543 | ad7606_ring_cleanup(indio_dev); |
Michael Hennerich | e61181d | 2011-05-18 14:42:01 +0100 | [diff] [blame] | 544 | |
| 545 | free_irq(st->irq, indio_dev); |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 546 | if (!IS_ERR(st->reg)) { |
| 547 | regulator_disable(st->reg); |
| 548 | regulator_put(st->reg); |
| 549 | } |
| 550 | |
| 551 | ad7606_free_gpios(st); |
Michael Hennerich | e61181d | 2011-05-18 14:42:01 +0100 | [diff] [blame] | 552 | iio_device_unregister(indio_dev); |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 553 | |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 554 | return 0; |
| 555 | } |
| 556 | |
Michael Hennerich | e61181d | 2011-05-18 14:42:01 +0100 | [diff] [blame] | 557 | void ad7606_suspend(struct iio_dev *indio_dev) |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 558 | { |
Michael Hennerich | e61181d | 2011-05-18 14:42:01 +0100 | [diff] [blame] | 559 | struct ad7606_state *st = iio_priv(indio_dev); |
| 560 | |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 561 | if (st->have_stby) { |
| 562 | if (st->have_range) |
| 563 | gpio_set_value(st->pdata->gpio_range, 1); |
| 564 | gpio_set_value(st->pdata->gpio_stby, 0); |
| 565 | } |
| 566 | } |
| 567 | |
Michael Hennerich | e61181d | 2011-05-18 14:42:01 +0100 | [diff] [blame] | 568 | void ad7606_resume(struct iio_dev *indio_dev) |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 569 | { |
Michael Hennerich | e61181d | 2011-05-18 14:42:01 +0100 | [diff] [blame] | 570 | struct ad7606_state *st = iio_priv(indio_dev); |
| 571 | |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 572 | if (st->have_stby) { |
| 573 | if (st->have_range) |
| 574 | gpio_set_value(st->pdata->gpio_range, |
| 575 | st->range == 10000); |
| 576 | |
| 577 | gpio_set_value(st->pdata->gpio_stby, 1); |
| 578 | ad7606_reset(st); |
| 579 | } |
| 580 | } |
| 581 | |
| 582 | MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); |
| 583 | MODULE_DESCRIPTION("Analog Devices AD7606 ADC"); |
| 584 | MODULE_LICENSE("GPL v2"); |