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 | |
Jonathan Cameron | 06458e2 | 2012-04-25 15:54:58 +0100 | [diff] [blame] | 21 | #include <linux/iio/iio.h> |
| 22 | #include <linux/iio/sysfs.h> |
| 23 | #include <linux/iio/buffer.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 | { |
Jonathan Cameron | 68b41ae | 2011-09-30 10:05:40 +0100 | [diff] [blame] | 29 | if (gpio_is_valid(st->pdata->gpio_reset)) { |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 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 | |
Jonathan Cameron | 68b41ae | 2011-09-30 10:05:40 +0100 | [diff] [blame] | 51 | if (gpio_is_valid(st->pdata->gpio_frstdata)) { |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 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) { |
Jonathan Cameron | b11f98f | 2012-04-15 17:41:18 +0100 | [diff] [blame] | 91 | case IIO_CHAN_INFO_RAW: |
Michael Hennerich | b9c4451 | 2011-05-18 14:42:27 +0100 | [diff] [blame] | 92 | mutex_lock(&indio_dev->mlock); |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 93 | if (iio_buffer_enabled(indio_dev)) |
Jonathan Cameron | 9380d5e | 2011-12-05 22:18:21 +0000 | [diff] [blame] | 94 | ret = -EBUSY; |
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; |
Jonathan Cameron | c8a9f80 | 2011-10-26 17:41:36 +0100 | [diff] [blame] | 103 | case IIO_CHAN_INFO_SCALE: |
Michael Hennerich | 1caf7cb | 2011-05-18 14:42:00 +0100 | [diff] [blame] | 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 | { |
Lars-Peter Clausen | 62c5183 | 2012-05-12 15:39:42 +0200 | [diff] [blame] | 116 | struct iio_dev *indio_dev = dev_to_iio_dev(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 | { |
Lars-Peter Clausen | 62c5183 | 2012-05-12 15:39:42 +0200 | [diff] [blame] | 125 | struct iio_dev *indio_dev = dev_to_iio_dev(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; |
Aida Mynzhasova | f86f836 | 2013-05-07 00:04:41 +0400 | [diff] [blame] | 128 | int ret; |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 129 | |
Aida Mynzhasova | f86f836 | 2013-05-07 00:04:41 +0400 | [diff] [blame] | 130 | ret = kstrtoul(buf, 10, &lval); |
| 131 | if (ret) |
| 132 | return ret; |
| 133 | |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 134 | if (!(lval == 5000 || lval == 10000)) { |
| 135 | dev_err(dev, "range is not supported\n"); |
| 136 | return -EINVAL; |
| 137 | } |
Michael Hennerich | b9c4451 | 2011-05-18 14:42:27 +0100 | [diff] [blame] | 138 | mutex_lock(&indio_dev->mlock); |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 139 | gpio_set_value(st->pdata->gpio_range, lval == 10000); |
| 140 | st->range = lval; |
Michael Hennerich | b9c4451 | 2011-05-18 14:42:27 +0100 | [diff] [blame] | 141 | mutex_unlock(&indio_dev->mlock); |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 142 | |
| 143 | return count; |
| 144 | } |
| 145 | |
Jonathan Cameron | cedd1a1 | 2011-09-14 13:01:24 +0100 | [diff] [blame] | 146 | static IIO_DEVICE_ATTR(in_voltage_range, S_IRUGO | S_IWUSR, \ |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 147 | ad7606_show_range, ad7606_store_range, 0); |
Jonathan Cameron | cedd1a1 | 2011-09-14 13:01:24 +0100 | [diff] [blame] | 148 | static IIO_CONST_ATTR(in_voltage_range_available, "5000 10000"); |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 149 | |
| 150 | static ssize_t ad7606_show_oversampling_ratio(struct device *dev, |
| 151 | struct device_attribute *attr, char *buf) |
| 152 | { |
Lars-Peter Clausen | 62c5183 | 2012-05-12 15:39:42 +0200 | [diff] [blame] | 153 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
Michael Hennerich | 44039a6 | 2011-05-18 14:42:28 +0100 | [diff] [blame] | 154 | struct ad7606_state *st = iio_priv(indio_dev); |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 155 | |
| 156 | return sprintf(buf, "%u\n", st->oversampling); |
| 157 | } |
| 158 | |
| 159 | static int ad7606_oversampling_get_index(unsigned val) |
| 160 | { |
| 161 | unsigned char supported[] = {0, 2, 4, 8, 16, 32, 64}; |
| 162 | int i; |
| 163 | |
| 164 | for (i = 0; i < ARRAY_SIZE(supported); i++) |
| 165 | if (val == supported[i]) |
| 166 | return i; |
| 167 | |
| 168 | return -EINVAL; |
| 169 | } |
| 170 | |
| 171 | static ssize_t ad7606_store_oversampling_ratio(struct device *dev, |
| 172 | struct device_attribute *attr, const char *buf, size_t count) |
| 173 | { |
Lars-Peter Clausen | 62c5183 | 2012-05-12 15:39:42 +0200 | [diff] [blame] | 174 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
Michael Hennerich | 44039a6 | 2011-05-18 14:42:28 +0100 | [diff] [blame] | 175 | struct ad7606_state *st = iio_priv(indio_dev); |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 176 | unsigned long lval; |
| 177 | int ret; |
| 178 | |
Aida Mynzhasova | f86f836 | 2013-05-07 00:04:41 +0400 | [diff] [blame] | 179 | ret = kstrtoul(buf, 10, &lval); |
| 180 | if (ret) |
| 181 | return ret; |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 182 | |
| 183 | ret = ad7606_oversampling_get_index(lval); |
| 184 | if (ret < 0) { |
| 185 | dev_err(dev, "oversampling %lu is not supported\n", lval); |
| 186 | return ret; |
| 187 | } |
| 188 | |
Michael Hennerich | b9c4451 | 2011-05-18 14:42:27 +0100 | [diff] [blame] | 189 | mutex_lock(&indio_dev->mlock); |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 190 | gpio_set_value(st->pdata->gpio_os0, (ret >> 0) & 1); |
| 191 | gpio_set_value(st->pdata->gpio_os1, (ret >> 1) & 1); |
| 192 | gpio_set_value(st->pdata->gpio_os1, (ret >> 2) & 1); |
| 193 | st->oversampling = lval; |
Michael Hennerich | b9c4451 | 2011-05-18 14:42:27 +0100 | [diff] [blame] | 194 | mutex_unlock(&indio_dev->mlock); |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 195 | |
| 196 | return count; |
| 197 | } |
| 198 | |
| 199 | static IIO_DEVICE_ATTR(oversampling_ratio, S_IRUGO | S_IWUSR, |
| 200 | ad7606_show_oversampling_ratio, |
| 201 | ad7606_store_oversampling_ratio, 0); |
| 202 | static IIO_CONST_ATTR(oversampling_ratio_available, "0 2 4 8 16 32 64"); |
| 203 | |
Jonathan Cameron | 9214cc6 | 2012-01-29 11:07:03 +0000 | [diff] [blame] | 204 | static struct attribute *ad7606_attributes_os_and_range[] = { |
Jonathan Cameron | cedd1a1 | 2011-09-14 13:01:24 +0100 | [diff] [blame] | 205 | &iio_dev_attr_in_voltage_range.dev_attr.attr, |
| 206 | &iio_const_attr_in_voltage_range_available.dev_attr.attr, |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 207 | &iio_dev_attr_oversampling_ratio.dev_attr.attr, |
| 208 | &iio_const_attr_oversampling_ratio_available.dev_attr.attr, |
| 209 | NULL, |
| 210 | }; |
| 211 | |
Jonathan Cameron | 9214cc6 | 2012-01-29 11:07:03 +0000 | [diff] [blame] | 212 | static const struct attribute_group ad7606_attribute_group_os_and_range = { |
| 213 | .attrs = ad7606_attributes_os_and_range, |
| 214 | }; |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 215 | |
Jonathan Cameron | 9214cc6 | 2012-01-29 11:07:03 +0000 | [diff] [blame] | 216 | static struct attribute *ad7606_attributes_os[] = { |
| 217 | &iio_dev_attr_oversampling_ratio.dev_attr.attr, |
| 218 | &iio_const_attr_oversampling_ratio_available.dev_attr.attr, |
| 219 | NULL, |
| 220 | }; |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 221 | |
Jonathan Cameron | 9214cc6 | 2012-01-29 11:07:03 +0000 | [diff] [blame] | 222 | static const struct attribute_group ad7606_attribute_group_os = { |
| 223 | .attrs = ad7606_attributes_os, |
| 224 | }; |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 225 | |
Jonathan Cameron | 9214cc6 | 2012-01-29 11:07:03 +0000 | [diff] [blame] | 226 | static struct attribute *ad7606_attributes_range[] = { |
| 227 | &iio_dev_attr_in_voltage_range.dev_attr.attr, |
| 228 | &iio_const_attr_in_voltage_range_available.dev_attr.attr, |
| 229 | NULL, |
| 230 | }; |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 231 | |
Jonathan Cameron | 9214cc6 | 2012-01-29 11:07:03 +0000 | [diff] [blame] | 232 | static const struct attribute_group ad7606_attribute_group_range = { |
| 233 | .attrs = ad7606_attributes_range, |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 234 | }; |
| 235 | |
Jonathan Cameron | b11f98f | 2012-04-15 17:41:18 +0100 | [diff] [blame] | 236 | #define AD7606_CHANNEL(num) \ |
| 237 | { \ |
| 238 | .type = IIO_VOLTAGE, \ |
| 239 | .indexed = 1, \ |
| 240 | .channel = num, \ |
| 241 | .address = num, \ |
Jonathan Cameron | 7593908 | 2013-02-27 19:37:28 +0000 | [diff] [blame] | 242 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ |
| 243 | .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),\ |
Jonathan Cameron | b11f98f | 2012-04-15 17:41:18 +0100 | [diff] [blame] | 244 | .scan_index = num, \ |
| 245 | .scan_type = IIO_ST('s', 16, 16, 0), \ |
Jonathan Cameron | 50ac23b | 2011-09-30 10:05:38 +0100 | [diff] [blame] | 246 | } |
| 247 | |
Lars-Peter Clausen | f4e4b95 | 2012-08-09 08:51:00 +0100 | [diff] [blame] | 248 | static const struct iio_chan_spec ad7606_8_channels[] = { |
Jonathan Cameron | 50ac23b | 2011-09-30 10:05:38 +0100 | [diff] [blame] | 249 | AD7606_CHANNEL(0), |
| 250 | AD7606_CHANNEL(1), |
| 251 | AD7606_CHANNEL(2), |
| 252 | AD7606_CHANNEL(3), |
| 253 | AD7606_CHANNEL(4), |
| 254 | AD7606_CHANNEL(5), |
| 255 | AD7606_CHANNEL(6), |
| 256 | AD7606_CHANNEL(7), |
Michael Hennerich | 1caf7cb | 2011-05-18 14:42:00 +0100 | [diff] [blame] | 257 | IIO_CHAN_SOFT_TIMESTAMP(8), |
| 258 | }; |
| 259 | |
Lars-Peter Clausen | f4e4b95 | 2012-08-09 08:51:00 +0100 | [diff] [blame] | 260 | static const struct iio_chan_spec ad7606_6_channels[] = { |
Jonathan Cameron | 50ac23b | 2011-09-30 10:05:38 +0100 | [diff] [blame] | 261 | AD7606_CHANNEL(0), |
| 262 | AD7606_CHANNEL(1), |
| 263 | AD7606_CHANNEL(2), |
| 264 | AD7606_CHANNEL(3), |
| 265 | AD7606_CHANNEL(4), |
| 266 | AD7606_CHANNEL(5), |
Michael Hennerich | 1caf7cb | 2011-05-18 14:42:00 +0100 | [diff] [blame] | 267 | IIO_CHAN_SOFT_TIMESTAMP(6), |
| 268 | }; |
| 269 | |
Lars-Peter Clausen | f4e4b95 | 2012-08-09 08:51:00 +0100 | [diff] [blame] | 270 | static const struct iio_chan_spec ad7606_4_channels[] = { |
Jonathan Cameron | 50ac23b | 2011-09-30 10:05:38 +0100 | [diff] [blame] | 271 | AD7606_CHANNEL(0), |
| 272 | AD7606_CHANNEL(1), |
| 273 | AD7606_CHANNEL(2), |
| 274 | AD7606_CHANNEL(3), |
Michael Hennerich | 1caf7cb | 2011-05-18 14:42:00 +0100 | [diff] [blame] | 275 | IIO_CHAN_SOFT_TIMESTAMP(4), |
| 276 | }; |
| 277 | |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 278 | static const struct ad7606_chip_info ad7606_chip_info_tbl[] = { |
| 279 | /* |
| 280 | * More devices added in future |
| 281 | */ |
| 282 | [ID_AD7606_8] = { |
| 283 | .name = "ad7606", |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 284 | .int_vref_mv = 2500, |
Michael Hennerich | 1caf7cb | 2011-05-18 14:42:00 +0100 | [diff] [blame] | 285 | .channels = ad7606_8_channels, |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 286 | .num_channels = 8, |
| 287 | }, |
| 288 | [ID_AD7606_6] = { |
| 289 | .name = "ad7606-6", |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 290 | .int_vref_mv = 2500, |
Michael Hennerich | 1caf7cb | 2011-05-18 14:42:00 +0100 | [diff] [blame] | 291 | .channels = ad7606_6_channels, |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 292 | .num_channels = 6, |
| 293 | }, |
| 294 | [ID_AD7606_4] = { |
| 295 | .name = "ad7606-4", |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 296 | .int_vref_mv = 2500, |
Michael Hennerich | 1caf7cb | 2011-05-18 14:42:00 +0100 | [diff] [blame] | 297 | .channels = ad7606_4_channels, |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 298 | .num_channels = 4, |
| 299 | }, |
| 300 | }; |
| 301 | |
| 302 | static int ad7606_request_gpios(struct ad7606_state *st) |
| 303 | { |
| 304 | struct gpio gpio_array[3] = { |
| 305 | [0] = { |
| 306 | .gpio = st->pdata->gpio_os0, |
| 307 | .flags = GPIOF_DIR_OUT | ((st->oversampling & 1) ? |
| 308 | GPIOF_INIT_HIGH : GPIOF_INIT_LOW), |
| 309 | .label = "AD7606_OS0", |
| 310 | }, |
| 311 | [1] = { |
| 312 | .gpio = st->pdata->gpio_os1, |
| 313 | .flags = GPIOF_DIR_OUT | ((st->oversampling & 2) ? |
| 314 | GPIOF_INIT_HIGH : GPIOF_INIT_LOW), |
| 315 | .label = "AD7606_OS1", |
| 316 | }, |
| 317 | [2] = { |
| 318 | .gpio = st->pdata->gpio_os2, |
| 319 | .flags = GPIOF_DIR_OUT | ((st->oversampling & 4) ? |
| 320 | GPIOF_INIT_HIGH : GPIOF_INIT_LOW), |
| 321 | .label = "AD7606_OS2", |
| 322 | }, |
| 323 | }; |
| 324 | int ret; |
| 325 | |
Jonathan Cameron | 68b41ae | 2011-09-30 10:05:40 +0100 | [diff] [blame] | 326 | if (gpio_is_valid(st->pdata->gpio_convst)) { |
| 327 | ret = gpio_request_one(st->pdata->gpio_convst, |
| 328 | GPIOF_OUT_INIT_LOW, |
| 329 | "AD7606_CONVST"); |
| 330 | if (ret) { |
| 331 | dev_err(st->dev, "failed to request GPIO CONVST\n"); |
| 332 | goto error_ret; |
| 333 | } |
| 334 | } else { |
| 335 | ret = -EIO; |
| 336 | goto error_ret; |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 337 | } |
| 338 | |
Jonathan Cameron | 68b41ae | 2011-09-30 10:05:40 +0100 | [diff] [blame] | 339 | if (gpio_is_valid(st->pdata->gpio_os0) && |
| 340 | gpio_is_valid(st->pdata->gpio_os1) && |
| 341 | gpio_is_valid(st->pdata->gpio_os2)) { |
| 342 | ret = gpio_request_array(gpio_array, ARRAY_SIZE(gpio_array)); |
| 343 | if (ret < 0) |
| 344 | goto error_free_convst; |
| 345 | } |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 346 | |
Jonathan Cameron | 68b41ae | 2011-09-30 10:05:40 +0100 | [diff] [blame] | 347 | if (gpio_is_valid(st->pdata->gpio_reset)) { |
| 348 | ret = gpio_request_one(st->pdata->gpio_reset, |
| 349 | GPIOF_OUT_INIT_LOW, |
| 350 | "AD7606_RESET"); |
| 351 | if (ret < 0) |
| 352 | goto error_free_os; |
| 353 | } |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 354 | |
Jonathan Cameron | 68b41ae | 2011-09-30 10:05:40 +0100 | [diff] [blame] | 355 | if (gpio_is_valid(st->pdata->gpio_range)) { |
| 356 | ret = gpio_request_one(st->pdata->gpio_range, GPIOF_DIR_OUT | |
| 357 | ((st->range == 10000) ? GPIOF_INIT_HIGH : |
| 358 | GPIOF_INIT_LOW), "AD7606_RANGE"); |
| 359 | if (ret < 0) |
| 360 | goto error_free_reset; |
| 361 | } |
| 362 | if (gpio_is_valid(st->pdata->gpio_stby)) { |
| 363 | ret = gpio_request_one(st->pdata->gpio_stby, |
| 364 | GPIOF_OUT_INIT_HIGH, |
| 365 | "AD7606_STBY"); |
| 366 | if (ret < 0) |
| 367 | goto error_free_range; |
| 368 | } |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 369 | |
| 370 | if (gpio_is_valid(st->pdata->gpio_frstdata)) { |
| 371 | ret = gpio_request_one(st->pdata->gpio_frstdata, GPIOF_IN, |
| 372 | "AD7606_FRSTDATA"); |
Jonathan Cameron | 68b41ae | 2011-09-30 10:05:40 +0100 | [diff] [blame] | 373 | if (ret < 0) |
| 374 | goto error_free_stby; |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 375 | } |
| 376 | |
| 377 | return 0; |
Jonathan Cameron | 68b41ae | 2011-09-30 10:05:40 +0100 | [diff] [blame] | 378 | |
| 379 | error_free_stby: |
| 380 | if (gpio_is_valid(st->pdata->gpio_stby)) |
| 381 | gpio_free(st->pdata->gpio_stby); |
| 382 | error_free_range: |
| 383 | if (gpio_is_valid(st->pdata->gpio_range)) |
| 384 | gpio_free(st->pdata->gpio_range); |
| 385 | error_free_reset: |
| 386 | if (gpio_is_valid(st->pdata->gpio_reset)) |
| 387 | gpio_free(st->pdata->gpio_reset); |
| 388 | error_free_os: |
| 389 | if (gpio_is_valid(st->pdata->gpio_os0) && |
| 390 | gpio_is_valid(st->pdata->gpio_os1) && |
| 391 | gpio_is_valid(st->pdata->gpio_os2)) |
| 392 | gpio_free_array(gpio_array, ARRAY_SIZE(gpio_array)); |
| 393 | error_free_convst: |
| 394 | gpio_free(st->pdata->gpio_convst); |
| 395 | error_ret: |
| 396 | return ret; |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 397 | } |
| 398 | |
| 399 | static void ad7606_free_gpios(struct ad7606_state *st) |
| 400 | { |
Jonathan Cameron | 68b41ae | 2011-09-30 10:05:40 +0100 | [diff] [blame] | 401 | if (gpio_is_valid(st->pdata->gpio_frstdata)) |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 402 | gpio_free(st->pdata->gpio_frstdata); |
Jonathan Cameron | 68b41ae | 2011-09-30 10:05:40 +0100 | [diff] [blame] | 403 | if (gpio_is_valid(st->pdata->gpio_stby)) |
| 404 | gpio_free(st->pdata->gpio_stby); |
| 405 | if (gpio_is_valid(st->pdata->gpio_range)) |
| 406 | gpio_free(st->pdata->gpio_range); |
| 407 | if (gpio_is_valid(st->pdata->gpio_reset)) |
| 408 | gpio_free(st->pdata->gpio_reset); |
| 409 | if (gpio_is_valid(st->pdata->gpio_os0) && |
| 410 | gpio_is_valid(st->pdata->gpio_os1) && |
| 411 | gpio_is_valid(st->pdata->gpio_os2)) { |
| 412 | gpio_free(st->pdata->gpio_os2); |
| 413 | gpio_free(st->pdata->gpio_os1); |
| 414 | gpio_free(st->pdata->gpio_os0); |
| 415 | } |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 416 | gpio_free(st->pdata->gpio_convst); |
| 417 | } |
| 418 | |
| 419 | /** |
| 420 | * Interrupt handler |
| 421 | */ |
| 422 | static irqreturn_t ad7606_interrupt(int irq, void *dev_id) |
| 423 | { |
Michael Hennerich | e61181d | 2011-05-18 14:42:01 +0100 | [diff] [blame] | 424 | struct iio_dev *indio_dev = dev_id; |
| 425 | struct ad7606_state *st = iio_priv(indio_dev); |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 426 | |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 427 | if (iio_buffer_enabled(indio_dev)) { |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 428 | if (!work_pending(&st->poll_work)) |
| 429 | schedule_work(&st->poll_work); |
| 430 | } else { |
| 431 | st->done = true; |
| 432 | wake_up_interruptible(&st->wq_data_avail); |
| 433 | } |
| 434 | |
| 435 | return IRQ_HANDLED; |
| 436 | }; |
| 437 | |
Jonathan Cameron | 9214cc6 | 2012-01-29 11:07:03 +0000 | [diff] [blame] | 438 | static const struct iio_info ad7606_info_no_os_or_range = { |
Jonathan Cameron | 6fe8135 | 2011-05-18 14:42:37 +0100 | [diff] [blame] | 439 | .driver_module = THIS_MODULE, |
| 440 | .read_raw = &ad7606_read_raw, |
Jonathan Cameron | 9214cc6 | 2012-01-29 11:07:03 +0000 | [diff] [blame] | 441 | }; |
| 442 | |
| 443 | static const struct iio_info ad7606_info_os_and_range = { |
| 444 | .driver_module = THIS_MODULE, |
| 445 | .read_raw = &ad7606_read_raw, |
| 446 | .attrs = &ad7606_attribute_group_os_and_range, |
| 447 | }; |
| 448 | |
| 449 | static const struct iio_info ad7606_info_os = { |
| 450 | .driver_module = THIS_MODULE, |
| 451 | .read_raw = &ad7606_read_raw, |
| 452 | .attrs = &ad7606_attribute_group_os, |
| 453 | }; |
| 454 | |
| 455 | static const struct iio_info ad7606_info_range = { |
| 456 | .driver_module = THIS_MODULE, |
| 457 | .read_raw = &ad7606_read_raw, |
| 458 | .attrs = &ad7606_attribute_group_range, |
Jonathan Cameron | 6fe8135 | 2011-05-18 14:42:37 +0100 | [diff] [blame] | 459 | }; |
| 460 | |
Michael Hennerich | e61181d | 2011-05-18 14:42:01 +0100 | [diff] [blame] | 461 | struct iio_dev *ad7606_probe(struct device *dev, int irq, |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 462 | void __iomem *base_address, |
| 463 | unsigned id, |
| 464 | const struct ad7606_bus_ops *bops) |
| 465 | { |
| 466 | struct ad7606_platform_data *pdata = dev->platform_data; |
| 467 | struct ad7606_state *st; |
Jonathan Cameron | 26d25ae | 2011-09-02 17:14:40 +0100 | [diff] [blame] | 468 | int ret; |
Lars-Peter Clausen | 7cbb753 | 2012-04-26 13:35:01 +0200 | [diff] [blame] | 469 | struct iio_dev *indio_dev = iio_device_alloc(sizeof(*st)); |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 470 | |
Michael Hennerich | e61181d | 2011-05-18 14:42:01 +0100 | [diff] [blame] | 471 | if (indio_dev == NULL) { |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 472 | ret = -ENOMEM; |
| 473 | goto error_ret; |
| 474 | } |
| 475 | |
Michael Hennerich | e61181d | 2011-05-18 14:42:01 +0100 | [diff] [blame] | 476 | st = iio_priv(indio_dev); |
| 477 | |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 478 | st->dev = dev; |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 479 | st->bops = bops; |
| 480 | st->base_address = base_address; |
| 481 | st->range = pdata->default_range == 10000 ? 10000 : 5000; |
| 482 | |
| 483 | ret = ad7606_oversampling_get_index(pdata->default_os); |
| 484 | if (ret < 0) { |
| 485 | dev_warn(dev, "oversampling %d is not supported\n", |
| 486 | pdata->default_os); |
| 487 | st->oversampling = 0; |
| 488 | } else { |
| 489 | st->oversampling = pdata->default_os; |
| 490 | } |
| 491 | |
| 492 | st->reg = regulator_get(dev, "vcc"); |
| 493 | if (!IS_ERR(st->reg)) { |
| 494 | ret = regulator_enable(st->reg); |
| 495 | if (ret) |
| 496 | goto error_put_reg; |
| 497 | } |
| 498 | |
| 499 | st->pdata = pdata; |
| 500 | st->chip_info = &ad7606_chip_info_tbl[id]; |
| 501 | |
Michael Hennerich | e61181d | 2011-05-18 14:42:01 +0100 | [diff] [blame] | 502 | indio_dev->dev.parent = dev; |
Jonathan Cameron | 9214cc6 | 2012-01-29 11:07:03 +0000 | [diff] [blame] | 503 | if (gpio_is_valid(st->pdata->gpio_os0) && |
| 504 | gpio_is_valid(st->pdata->gpio_os1) && |
| 505 | gpio_is_valid(st->pdata->gpio_os2)) { |
| 506 | if (gpio_is_valid(st->pdata->gpio_range)) |
| 507 | indio_dev->info = &ad7606_info_os_and_range; |
| 508 | else |
| 509 | indio_dev->info = &ad7606_info_os; |
| 510 | } else { |
| 511 | if (gpio_is_valid(st->pdata->gpio_range)) |
| 512 | indio_dev->info = &ad7606_info_range; |
| 513 | else |
| 514 | indio_dev->info = &ad7606_info_no_os_or_range; |
| 515 | } |
Michael Hennerich | e61181d | 2011-05-18 14:42:01 +0100 | [diff] [blame] | 516 | indio_dev->modes = INDIO_DIRECT_MODE; |
| 517 | indio_dev->name = st->chip_info->name; |
| 518 | indio_dev->channels = st->chip_info->channels; |
| 519 | indio_dev->num_channels = st->chip_info->num_channels; |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 520 | |
| 521 | init_waitqueue_head(&st->wq_data_avail); |
| 522 | |
| 523 | ret = ad7606_request_gpios(st); |
| 524 | if (ret) |
Michael Hennerich | e61181d | 2011-05-18 14:42:01 +0100 | [diff] [blame] | 525 | goto error_disable_reg; |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 526 | |
| 527 | ret = ad7606_reset(st); |
| 528 | if (ret) |
| 529 | dev_warn(st->dev, "failed to RESET: no RESET GPIO specified\n"); |
| 530 | |
Jonathan Cameron | 8cbb36a | 2011-09-30 10:05:42 +0100 | [diff] [blame] | 531 | ret = request_irq(irq, ad7606_interrupt, |
Michael Hennerich | e61181d | 2011-05-18 14:42:01 +0100 | [diff] [blame] | 532 | IRQF_TRIGGER_FALLING, st->chip_info->name, indio_dev); |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 533 | if (ret) |
| 534 | goto error_free_gpios; |
| 535 | |
Michael Hennerich | e61181d | 2011-05-18 14:42:01 +0100 | [diff] [blame] | 536 | ret = ad7606_register_ring_funcs_and_init(indio_dev); |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 537 | if (ret) |
| 538 | goto error_free_irq; |
| 539 | |
Jonathan Cameron | 26d25ae | 2011-09-02 17:14:40 +0100 | [diff] [blame] | 540 | ret = iio_device_register(indio_dev); |
| 541 | if (ret) |
| 542 | goto error_unregister_ring; |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 543 | |
Michael Hennerich | e61181d | 2011-05-18 14:42:01 +0100 | [diff] [blame] | 544 | return indio_dev; |
Jonathan Cameron | 26d25ae | 2011-09-02 17:14:40 +0100 | [diff] [blame] | 545 | error_unregister_ring: |
Michael Hennerich | e61181d | 2011-05-18 14:42:01 +0100 | [diff] [blame] | 546 | ad7606_ring_cleanup(indio_dev); |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 547 | |
| 548 | error_free_irq: |
Jonathan Cameron | 8cbb36a | 2011-09-30 10:05:42 +0100 | [diff] [blame] | 549 | free_irq(irq, indio_dev); |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 550 | |
| 551 | error_free_gpios: |
| 552 | ad7606_free_gpios(st); |
| 553 | |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 554 | error_disable_reg: |
| 555 | if (!IS_ERR(st->reg)) |
| 556 | regulator_disable(st->reg); |
| 557 | error_put_reg: |
| 558 | if (!IS_ERR(st->reg)) |
| 559 | regulator_put(st->reg); |
Lars-Peter Clausen | 7cbb753 | 2012-04-26 13:35:01 +0200 | [diff] [blame] | 560 | iio_device_free(indio_dev); |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 561 | error_ret: |
| 562 | return ERR_PTR(ret); |
| 563 | } |
| 564 | |
Jonathan Cameron | 8cbb36a | 2011-09-30 10:05:42 +0100 | [diff] [blame] | 565 | int ad7606_remove(struct iio_dev *indio_dev, int irq) |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 566 | { |
Michael Hennerich | e61181d | 2011-05-18 14:42:01 +0100 | [diff] [blame] | 567 | struct ad7606_state *st = iio_priv(indio_dev); |
| 568 | |
Jonathan Cameron | d2fffd6 | 2011-10-14 14:46:58 +0100 | [diff] [blame] | 569 | iio_device_unregister(indio_dev); |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 570 | ad7606_ring_cleanup(indio_dev); |
Michael Hennerich | e61181d | 2011-05-18 14:42:01 +0100 | [diff] [blame] | 571 | |
Jonathan Cameron | 8cbb36a | 2011-09-30 10:05:42 +0100 | [diff] [blame] | 572 | free_irq(irq, indio_dev); |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 573 | if (!IS_ERR(st->reg)) { |
| 574 | regulator_disable(st->reg); |
| 575 | regulator_put(st->reg); |
| 576 | } |
| 577 | |
| 578 | ad7606_free_gpios(st); |
Lars-Peter Clausen | 7cbb753 | 2012-04-26 13:35:01 +0200 | [diff] [blame] | 579 | iio_device_free(indio_dev); |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 580 | |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 581 | return 0; |
| 582 | } |
| 583 | |
Michael Hennerich | e61181d | 2011-05-18 14:42:01 +0100 | [diff] [blame] | 584 | void ad7606_suspend(struct iio_dev *indio_dev) |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 585 | { |
Michael Hennerich | e61181d | 2011-05-18 14:42:01 +0100 | [diff] [blame] | 586 | struct ad7606_state *st = iio_priv(indio_dev); |
| 587 | |
Jonathan Cameron | 68b41ae | 2011-09-30 10:05:40 +0100 | [diff] [blame] | 588 | if (gpio_is_valid(st->pdata->gpio_stby)) { |
| 589 | if (gpio_is_valid(st->pdata->gpio_range)) |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 590 | gpio_set_value(st->pdata->gpio_range, 1); |
| 591 | gpio_set_value(st->pdata->gpio_stby, 0); |
| 592 | } |
| 593 | } |
| 594 | |
Michael Hennerich | e61181d | 2011-05-18 14:42:01 +0100 | [diff] [blame] | 595 | void ad7606_resume(struct iio_dev *indio_dev) |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 596 | { |
Michael Hennerich | e61181d | 2011-05-18 14:42:01 +0100 | [diff] [blame] | 597 | struct ad7606_state *st = iio_priv(indio_dev); |
| 598 | |
Jonathan Cameron | 68b41ae | 2011-09-30 10:05:40 +0100 | [diff] [blame] | 599 | if (gpio_is_valid(st->pdata->gpio_stby)) { |
| 600 | if (gpio_is_valid(st->pdata->gpio_range)) |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 601 | gpio_set_value(st->pdata->gpio_range, |
| 602 | st->range == 10000); |
| 603 | |
| 604 | gpio_set_value(st->pdata->gpio_stby, 1); |
| 605 | ad7606_reset(st); |
| 606 | } |
| 607 | } |
| 608 | |
| 609 | MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); |
| 610 | MODULE_DESCRIPTION("Analog Devices AD7606 ADC"); |
| 611 | MODULE_LICENSE("GPL v2"); |