Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 1 | /* |
Lars-Peter Clausen | bb92ff3 | 2012-02-21 18:38:16 +0100 | [diff] [blame] | 2 | * AD5024, AD5025, AD5044, AD5045, AD5064, AD5064-1, AD5065, AD5628, AD5648, |
Lars-Peter Clausen | 64f4eaa | 2012-02-21 18:38:17 +0100 | [diff] [blame] | 3 | * AD5666, AD5668 Digital to analog converters driver |
Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 4 | * |
| 5 | * Copyright 2011 Analog Devices Inc. |
| 6 | * |
| 7 | * Licensed under the GPL-2. |
| 8 | */ |
| 9 | |
| 10 | #include <linux/device.h> |
| 11 | #include <linux/err.h> |
| 12 | #include <linux/module.h> |
| 13 | #include <linux/kernel.h> |
| 14 | #include <linux/spi/spi.h> |
| 15 | #include <linux/slab.h> |
| 16 | #include <linux/sysfs.h> |
| 17 | #include <linux/regulator/consumer.h> |
| 18 | |
Jonathan Cameron | 06458e2 | 2012-04-25 15:54:58 +0100 | [diff] [blame] | 19 | #include <linux/iio/iio.h> |
| 20 | #include <linux/iio/sysfs.h> |
Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 21 | |
Lars-Peter Clausen | bb92ff3 | 2012-02-21 18:38:16 +0100 | [diff] [blame] | 22 | #define AD5064_MAX_DAC_CHANNELS 8 |
Lars-Peter Clausen | 83c169d | 2012-02-21 18:38:14 +0100 | [diff] [blame] | 23 | #define AD5064_MAX_VREFS 4 |
Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 24 | |
| 25 | #define AD5064_ADDR(x) ((x) << 20) |
| 26 | #define AD5064_CMD(x) ((x) << 24) |
| 27 | |
| 28 | #define AD5064_ADDR_DAC(chan) (chan) |
| 29 | #define AD5064_ADDR_ALL_DAC 0xF |
| 30 | |
| 31 | #define AD5064_CMD_WRITE_INPUT_N 0x0 |
| 32 | #define AD5064_CMD_UPDATE_DAC_N 0x1 |
| 33 | #define AD5064_CMD_WRITE_INPUT_N_UPDATE_ALL 0x2 |
| 34 | #define AD5064_CMD_WRITE_INPUT_N_UPDATE_N 0x3 |
| 35 | #define AD5064_CMD_POWERDOWN_DAC 0x4 |
| 36 | #define AD5064_CMD_CLEAR 0x5 |
| 37 | #define AD5064_CMD_LDAC_MASK 0x6 |
| 38 | #define AD5064_CMD_RESET 0x7 |
Lars-Peter Clausen | bb92ff3 | 2012-02-21 18:38:16 +0100 | [diff] [blame] | 39 | #define AD5064_CMD_CONFIG 0x8 |
| 40 | |
| 41 | #define AD5064_CONFIG_DAISY_CHAIN_ENABLE BIT(1) |
| 42 | #define AD5064_CONFIG_INT_VREF_ENABLE BIT(0) |
Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 43 | |
| 44 | #define AD5064_LDAC_PWRDN_NONE 0x0 |
| 45 | #define AD5064_LDAC_PWRDN_1K 0x1 |
| 46 | #define AD5064_LDAC_PWRDN_100K 0x2 |
| 47 | #define AD5064_LDAC_PWRDN_3STATE 0x3 |
| 48 | |
| 49 | /** |
| 50 | * struct ad5064_chip_info - chip specific information |
| 51 | * @shared_vref: whether the vref supply is shared between channels |
Lars-Peter Clausen | bb92ff3 | 2012-02-21 18:38:16 +0100 | [diff] [blame] | 52 | * @internal_vref: internal reference voltage. 0 if the chip has no internal |
| 53 | * vref. |
Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 54 | * @channel: channel specification |
Lars-Peter Clausen | 83c169d | 2012-02-21 18:38:14 +0100 | [diff] [blame] | 55 | * @num_channels: number of channels |
| 56 | */ |
Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 57 | |
| 58 | struct ad5064_chip_info { |
| 59 | bool shared_vref; |
Lars-Peter Clausen | bb92ff3 | 2012-02-21 18:38:16 +0100 | [diff] [blame] | 60 | unsigned long internal_vref; |
Lars-Peter Clausen | 83c169d | 2012-02-21 18:38:14 +0100 | [diff] [blame] | 61 | const struct iio_chan_spec *channels; |
| 62 | unsigned int num_channels; |
Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 63 | }; |
| 64 | |
| 65 | /** |
| 66 | * struct ad5064_state - driver instance specific data |
| 67 | * @spi: spi_device |
| 68 | * @chip_info: chip model specific constants, available modes etc |
| 69 | * @vref_reg: vref supply regulators |
| 70 | * @pwr_down: whether channel is powered down |
| 71 | * @pwr_down_mode: channel's current power down mode |
| 72 | * @dac_cache: current DAC raw value (chip does not support readback) |
Lars-Peter Clausen | bb92ff3 | 2012-02-21 18:38:16 +0100 | [diff] [blame] | 73 | * @use_internal_vref: set to true if the internal reference voltage should be |
| 74 | * used. |
Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 75 | * @data: spi transfer buffers |
| 76 | */ |
| 77 | |
| 78 | struct ad5064_state { |
| 79 | struct spi_device *spi; |
| 80 | const struct ad5064_chip_info *chip_info; |
Lars-Peter Clausen | 83c169d | 2012-02-21 18:38:14 +0100 | [diff] [blame] | 81 | struct regulator_bulk_data vref_reg[AD5064_MAX_VREFS]; |
| 82 | bool pwr_down[AD5064_MAX_DAC_CHANNELS]; |
| 83 | u8 pwr_down_mode[AD5064_MAX_DAC_CHANNELS]; |
| 84 | unsigned int dac_cache[AD5064_MAX_DAC_CHANNELS]; |
Lars-Peter Clausen | bb92ff3 | 2012-02-21 18:38:16 +0100 | [diff] [blame] | 85 | bool use_internal_vref; |
Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 86 | |
| 87 | /* |
| 88 | * DMA (thus cache coherency maintenance) requires the |
| 89 | * transfer buffers to live in their own cache lines. |
| 90 | */ |
| 91 | __be32 data ____cacheline_aligned; |
| 92 | }; |
| 93 | |
| 94 | enum ad5064_type { |
| 95 | ID_AD5024, |
Lars-Peter Clausen | f8be4af | 2012-02-21 18:38:15 +0100 | [diff] [blame] | 96 | ID_AD5025, |
Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 97 | ID_AD5044, |
Lars-Peter Clausen | f8be4af | 2012-02-21 18:38:15 +0100 | [diff] [blame] | 98 | ID_AD5045, |
Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 99 | ID_AD5064, |
| 100 | ID_AD5064_1, |
Lars-Peter Clausen | f8be4af | 2012-02-21 18:38:15 +0100 | [diff] [blame] | 101 | ID_AD5065, |
Lars-Peter Clausen | bb92ff3 | 2012-02-21 18:38:16 +0100 | [diff] [blame] | 102 | ID_AD5628_1, |
| 103 | ID_AD5628_2, |
| 104 | ID_AD5648_1, |
| 105 | ID_AD5648_2, |
Lars-Peter Clausen | 64f4eaa | 2012-02-21 18:38:17 +0100 | [diff] [blame] | 106 | ID_AD5666_1, |
| 107 | ID_AD5666_2, |
Lars-Peter Clausen | bb92ff3 | 2012-02-21 18:38:16 +0100 | [diff] [blame] | 108 | ID_AD5668_1, |
| 109 | ID_AD5668_2, |
Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 110 | }; |
| 111 | |
Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 112 | static int ad5064_spi_write(struct ad5064_state *st, unsigned int cmd, |
| 113 | unsigned int addr, unsigned int val, unsigned int shift) |
| 114 | { |
| 115 | val <<= shift; |
| 116 | |
| 117 | st->data = cpu_to_be32(AD5064_CMD(cmd) | AD5064_ADDR(addr) | val); |
| 118 | |
| 119 | return spi_write(st->spi, &st->data, sizeof(st->data)); |
| 120 | } |
| 121 | |
| 122 | static int ad5064_sync_powerdown_mode(struct ad5064_state *st, |
| 123 | unsigned int channel) |
| 124 | { |
| 125 | unsigned int val; |
| 126 | int ret; |
| 127 | |
| 128 | val = (0x1 << channel); |
| 129 | |
| 130 | if (st->pwr_down[channel]) |
| 131 | val |= st->pwr_down_mode[channel] << 8; |
| 132 | |
| 133 | ret = ad5064_spi_write(st, AD5064_CMD_POWERDOWN_DAC, 0, val, 0); |
| 134 | |
| 135 | return ret; |
| 136 | } |
| 137 | |
Lars-Peter Clausen | 26628f6 | 2012-06-04 11:36:12 +0200 | [diff] [blame] | 138 | static const char * const ad5064_powerdown_modes[] = { |
| 139 | "1kohm_to_gnd", |
| 140 | "100kohm_to_gnd", |
| 141 | "three_state", |
Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 142 | }; |
| 143 | |
Lars-Peter Clausen | 26628f6 | 2012-06-04 11:36:12 +0200 | [diff] [blame] | 144 | static int ad5064_get_powerdown_mode(struct iio_dev *indio_dev, |
| 145 | const struct iio_chan_spec *chan) |
Lars-Peter Clausen | 1d0d879 | 2012-02-21 18:38:13 +0100 | [diff] [blame] | 146 | { |
Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 147 | struct ad5064_state *st = iio_priv(indio_dev); |
| 148 | |
Lars-Peter Clausen | 26628f6 | 2012-06-04 11:36:12 +0200 | [diff] [blame] | 149 | return st->pwr_down_mode[chan->channel] - 1; |
Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 150 | } |
| 151 | |
Lars-Peter Clausen | 26628f6 | 2012-06-04 11:36:12 +0200 | [diff] [blame] | 152 | static int ad5064_set_powerdown_mode(struct iio_dev *indio_dev, |
| 153 | const struct iio_chan_spec *chan, unsigned int mode) |
Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 154 | { |
Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 155 | struct ad5064_state *st = iio_priv(indio_dev); |
Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 156 | int ret; |
| 157 | |
Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 158 | mutex_lock(&indio_dev->mlock); |
Lars-Peter Clausen | 26628f6 | 2012-06-04 11:36:12 +0200 | [diff] [blame] | 159 | st->pwr_down_mode[chan->channel] = mode + 1; |
Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 160 | |
Lars-Peter Clausen | 1d0d879 | 2012-02-21 18:38:13 +0100 | [diff] [blame] | 161 | ret = ad5064_sync_powerdown_mode(st, chan->channel); |
Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 162 | mutex_unlock(&indio_dev->mlock); |
| 163 | |
Lars-Peter Clausen | 26628f6 | 2012-06-04 11:36:12 +0200 | [diff] [blame] | 164 | return ret; |
Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 165 | } |
| 166 | |
Lars-Peter Clausen | 26628f6 | 2012-06-04 11:36:12 +0200 | [diff] [blame] | 167 | static const struct iio_enum ad5064_powerdown_mode_enum = { |
| 168 | .items = ad5064_powerdown_modes, |
| 169 | .num_items = ARRAY_SIZE(ad5064_powerdown_modes), |
| 170 | .get = ad5064_get_powerdown_mode, |
| 171 | .set = ad5064_set_powerdown_mode, |
| 172 | }; |
| 173 | |
Lars-Peter Clausen | 1d0d879 | 2012-02-21 18:38:13 +0100 | [diff] [blame] | 174 | static ssize_t ad5064_read_dac_powerdown(struct iio_dev *indio_dev, |
Michael Hennerich | fc6d113 | 2012-04-27 10:58:36 +0200 | [diff] [blame] | 175 | uintptr_t private, const struct iio_chan_spec *chan, char *buf) |
Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 176 | { |
Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 177 | struct ad5064_state *st = iio_priv(indio_dev); |
Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 178 | |
Lars-Peter Clausen | 1d0d879 | 2012-02-21 18:38:13 +0100 | [diff] [blame] | 179 | return sprintf(buf, "%d\n", st->pwr_down[chan->channel]); |
Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 180 | } |
| 181 | |
Lars-Peter Clausen | 1d0d879 | 2012-02-21 18:38:13 +0100 | [diff] [blame] | 182 | static ssize_t ad5064_write_dac_powerdown(struct iio_dev *indio_dev, |
Michael Hennerich | fc6d113 | 2012-04-27 10:58:36 +0200 | [diff] [blame] | 183 | uintptr_t private, const struct iio_chan_spec *chan, const char *buf, |
| 184 | size_t len) |
Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 185 | { |
Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 186 | struct ad5064_state *st = iio_priv(indio_dev); |
Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 187 | bool pwr_down; |
| 188 | int ret; |
| 189 | |
| 190 | ret = strtobool(buf, &pwr_down); |
| 191 | if (ret) |
| 192 | return ret; |
| 193 | |
| 194 | mutex_lock(&indio_dev->mlock); |
Lars-Peter Clausen | 1d0d879 | 2012-02-21 18:38:13 +0100 | [diff] [blame] | 195 | st->pwr_down[chan->channel] = pwr_down; |
Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 196 | |
Lars-Peter Clausen | 1d0d879 | 2012-02-21 18:38:13 +0100 | [diff] [blame] | 197 | ret = ad5064_sync_powerdown_mode(st, chan->channel); |
Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 198 | mutex_unlock(&indio_dev->mlock); |
| 199 | return ret ? ret : len; |
| 200 | } |
| 201 | |
Lars-Peter Clausen | bb92ff3 | 2012-02-21 18:38:16 +0100 | [diff] [blame] | 202 | static int ad5064_get_vref(struct ad5064_state *st, |
| 203 | struct iio_chan_spec const *chan) |
| 204 | { |
| 205 | unsigned int i; |
| 206 | |
| 207 | if (st->use_internal_vref) |
| 208 | return st->chip_info->internal_vref; |
| 209 | |
| 210 | i = st->chip_info->shared_vref ? 0 : chan->channel; |
| 211 | return regulator_get_voltage(st->vref_reg[i].consumer); |
| 212 | } |
| 213 | |
Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 214 | static int ad5064_read_raw(struct iio_dev *indio_dev, |
| 215 | struct iio_chan_spec const *chan, |
| 216 | int *val, |
| 217 | int *val2, |
| 218 | long m) |
| 219 | { |
| 220 | struct ad5064_state *st = iio_priv(indio_dev); |
Dan Carpenter | 23a3b8c | 2011-10-29 10:20:42 +0300 | [diff] [blame] | 221 | int scale_uv; |
Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 222 | |
| 223 | switch (m) { |
Jonathan Cameron | 09f4eb4 | 2012-04-15 17:41:19 +0100 | [diff] [blame] | 224 | case IIO_CHAN_INFO_RAW: |
Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 225 | *val = st->dac_cache[chan->channel]; |
| 226 | return IIO_VAL_INT; |
Jonathan Cameron | c8a9f80 | 2011-10-26 17:41:36 +0100 | [diff] [blame] | 227 | case IIO_CHAN_INFO_SCALE: |
Lars-Peter Clausen | bb92ff3 | 2012-02-21 18:38:16 +0100 | [diff] [blame] | 228 | scale_uv = ad5064_get_vref(st, chan); |
Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 229 | if (scale_uv < 0) |
| 230 | return scale_uv; |
| 231 | |
| 232 | scale_uv = (scale_uv * 100) >> chan->scan_type.realbits; |
| 233 | *val = scale_uv / 100000; |
| 234 | *val2 = (scale_uv % 100000) * 10; |
| 235 | return IIO_VAL_INT_PLUS_MICRO; |
| 236 | default: |
| 237 | break; |
| 238 | } |
| 239 | return -EINVAL; |
| 240 | } |
| 241 | |
| 242 | static int ad5064_write_raw(struct iio_dev *indio_dev, |
| 243 | struct iio_chan_spec const *chan, int val, int val2, long mask) |
| 244 | { |
| 245 | struct ad5064_state *st = iio_priv(indio_dev); |
| 246 | int ret; |
| 247 | |
| 248 | switch (mask) { |
Jonathan Cameron | 09f4eb4 | 2012-04-15 17:41:19 +0100 | [diff] [blame] | 249 | case IIO_CHAN_INFO_RAW: |
Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 250 | if (val > (1 << chan->scan_type.realbits) || val < 0) |
| 251 | return -EINVAL; |
| 252 | |
| 253 | mutex_lock(&indio_dev->mlock); |
| 254 | ret = ad5064_spi_write(st, AD5064_CMD_WRITE_INPUT_N_UPDATE_N, |
| 255 | chan->address, val, chan->scan_type.shift); |
| 256 | if (ret == 0) |
| 257 | st->dac_cache[chan->channel] = val; |
| 258 | mutex_unlock(&indio_dev->mlock); |
| 259 | break; |
| 260 | default: |
| 261 | ret = -EINVAL; |
| 262 | } |
| 263 | |
| 264 | return ret; |
| 265 | } |
| 266 | |
| 267 | static const struct iio_info ad5064_info = { |
| 268 | .read_raw = ad5064_read_raw, |
| 269 | .write_raw = ad5064_write_raw, |
Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 270 | .driver_module = THIS_MODULE, |
| 271 | }; |
| 272 | |
Lars-Peter Clausen | 26628f6 | 2012-06-04 11:36:12 +0200 | [diff] [blame] | 273 | static const struct iio_chan_spec_ext_info ad5064_ext_info[] = { |
Lars-Peter Clausen | 1d0d879 | 2012-02-21 18:38:13 +0100 | [diff] [blame] | 274 | { |
| 275 | .name = "powerdown", |
| 276 | .read = ad5064_read_dac_powerdown, |
| 277 | .write = ad5064_write_dac_powerdown, |
| 278 | }, |
Lars-Peter Clausen | 26628f6 | 2012-06-04 11:36:12 +0200 | [diff] [blame] | 279 | IIO_ENUM("powerdown_mode", false, &ad5064_powerdown_mode_enum), |
| 280 | IIO_ENUM_AVAILABLE("powerdown_mode", &ad5064_powerdown_mode_enum), |
Lars-Peter Clausen | 1d0d879 | 2012-02-21 18:38:13 +0100 | [diff] [blame] | 281 | { }, |
| 282 | }; |
| 283 | |
| 284 | #define AD5064_CHANNEL(chan, bits) { \ |
| 285 | .type = IIO_VOLTAGE, \ |
| 286 | .indexed = 1, \ |
| 287 | .output = 1, \ |
| 288 | .channel = (chan), \ |
Jonathan Cameron | 09f4eb4 | 2012-04-15 17:41:19 +0100 | [diff] [blame] | 289 | .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT | \ |
| 290 | IIO_CHAN_INFO_SCALE_SEPARATE_BIT, \ |
Lars-Peter Clausen | 1d0d879 | 2012-02-21 18:38:13 +0100 | [diff] [blame] | 291 | .address = AD5064_ADDR_DAC(chan), \ |
| 292 | .scan_type = IIO_ST('u', (bits), 16, 20 - (bits)), \ |
| 293 | .ext_info = ad5064_ext_info, \ |
| 294 | } |
| 295 | |
Lars-Peter Clausen | 83c169d | 2012-02-21 18:38:14 +0100 | [diff] [blame] | 296 | #define DECLARE_AD5064_CHANNELS(name, bits) \ |
| 297 | const struct iio_chan_spec name[] = { \ |
| 298 | AD5064_CHANNEL(0, bits), \ |
| 299 | AD5064_CHANNEL(1, bits), \ |
| 300 | AD5064_CHANNEL(2, bits), \ |
| 301 | AD5064_CHANNEL(3, bits), \ |
Lars-Peter Clausen | bb92ff3 | 2012-02-21 18:38:16 +0100 | [diff] [blame] | 302 | AD5064_CHANNEL(4, bits), \ |
| 303 | AD5064_CHANNEL(5, bits), \ |
| 304 | AD5064_CHANNEL(6, bits), \ |
| 305 | AD5064_CHANNEL(7, bits), \ |
Lars-Peter Clausen | 83c169d | 2012-02-21 18:38:14 +0100 | [diff] [blame] | 306 | } |
| 307 | |
| 308 | static DECLARE_AD5064_CHANNELS(ad5024_channels, 12); |
| 309 | static DECLARE_AD5064_CHANNELS(ad5044_channels, 14); |
| 310 | static DECLARE_AD5064_CHANNELS(ad5064_channels, 16); |
| 311 | |
Lars-Peter Clausen | 1d0d879 | 2012-02-21 18:38:13 +0100 | [diff] [blame] | 312 | static const struct ad5064_chip_info ad5064_chip_info_tbl[] = { |
| 313 | [ID_AD5024] = { |
| 314 | .shared_vref = false, |
Lars-Peter Clausen | 83c169d | 2012-02-21 18:38:14 +0100 | [diff] [blame] | 315 | .channels = ad5024_channels, |
| 316 | .num_channels = 4, |
Lars-Peter Clausen | 1d0d879 | 2012-02-21 18:38:13 +0100 | [diff] [blame] | 317 | }, |
Lars-Peter Clausen | f8be4af | 2012-02-21 18:38:15 +0100 | [diff] [blame] | 318 | [ID_AD5025] = { |
| 319 | .shared_vref = false, |
| 320 | .channels = ad5024_channels, |
| 321 | .num_channels = 2, |
| 322 | }, |
Lars-Peter Clausen | 1d0d879 | 2012-02-21 18:38:13 +0100 | [diff] [blame] | 323 | [ID_AD5044] = { |
| 324 | .shared_vref = false, |
Lars-Peter Clausen | 83c169d | 2012-02-21 18:38:14 +0100 | [diff] [blame] | 325 | .channels = ad5044_channels, |
| 326 | .num_channels = 4, |
Lars-Peter Clausen | 1d0d879 | 2012-02-21 18:38:13 +0100 | [diff] [blame] | 327 | }, |
Lars-Peter Clausen | f8be4af | 2012-02-21 18:38:15 +0100 | [diff] [blame] | 328 | [ID_AD5045] = { |
| 329 | .shared_vref = false, |
| 330 | .channels = ad5044_channels, |
| 331 | .num_channels = 2, |
| 332 | }, |
Lars-Peter Clausen | 1d0d879 | 2012-02-21 18:38:13 +0100 | [diff] [blame] | 333 | [ID_AD5064] = { |
| 334 | .shared_vref = false, |
Lars-Peter Clausen | 83c169d | 2012-02-21 18:38:14 +0100 | [diff] [blame] | 335 | .channels = ad5064_channels, |
| 336 | .num_channels = 4, |
Lars-Peter Clausen | 1d0d879 | 2012-02-21 18:38:13 +0100 | [diff] [blame] | 337 | }, |
| 338 | [ID_AD5064_1] = { |
| 339 | .shared_vref = true, |
Lars-Peter Clausen | 83c169d | 2012-02-21 18:38:14 +0100 | [diff] [blame] | 340 | .channels = ad5064_channels, |
| 341 | .num_channels = 4, |
Lars-Peter Clausen | 1d0d879 | 2012-02-21 18:38:13 +0100 | [diff] [blame] | 342 | }, |
Lars-Peter Clausen | f8be4af | 2012-02-21 18:38:15 +0100 | [diff] [blame] | 343 | [ID_AD5065] = { |
| 344 | .shared_vref = false, |
| 345 | .channels = ad5064_channels, |
| 346 | .num_channels = 2, |
| 347 | }, |
Lars-Peter Clausen | bb92ff3 | 2012-02-21 18:38:16 +0100 | [diff] [blame] | 348 | [ID_AD5628_1] = { |
| 349 | .shared_vref = true, |
| 350 | .internal_vref = 2500000, |
| 351 | .channels = ad5024_channels, |
| 352 | .num_channels = 8, |
| 353 | }, |
| 354 | [ID_AD5628_2] = { |
| 355 | .shared_vref = true, |
| 356 | .internal_vref = 5000000, |
| 357 | .channels = ad5024_channels, |
| 358 | .num_channels = 8, |
| 359 | }, |
| 360 | [ID_AD5648_1] = { |
| 361 | .shared_vref = true, |
| 362 | .internal_vref = 2500000, |
| 363 | .channels = ad5044_channels, |
| 364 | .num_channels = 8, |
| 365 | }, |
| 366 | [ID_AD5648_2] = { |
| 367 | .shared_vref = true, |
| 368 | .internal_vref = 5000000, |
| 369 | .channels = ad5044_channels, |
| 370 | .num_channels = 8, |
| 371 | }, |
Lars-Peter Clausen | 64f4eaa | 2012-02-21 18:38:17 +0100 | [diff] [blame] | 372 | [ID_AD5666_1] = { |
| 373 | .shared_vref = true, |
| 374 | .internal_vref = 2500000, |
| 375 | .channels = ad5064_channels, |
| 376 | .num_channels = 4, |
| 377 | }, |
| 378 | [ID_AD5666_2] = { |
| 379 | .shared_vref = true, |
| 380 | .internal_vref = 5000000, |
| 381 | .channels = ad5064_channels, |
| 382 | .num_channels = 4, |
| 383 | }, |
Lars-Peter Clausen | bb92ff3 | 2012-02-21 18:38:16 +0100 | [diff] [blame] | 384 | [ID_AD5668_1] = { |
| 385 | .shared_vref = true, |
| 386 | .internal_vref = 2500000, |
| 387 | .channels = ad5064_channels, |
| 388 | .num_channels = 8, |
| 389 | }, |
| 390 | [ID_AD5668_2] = { |
| 391 | .shared_vref = true, |
| 392 | .internal_vref = 5000000, |
| 393 | .channels = ad5064_channels, |
| 394 | .num_channels = 8, |
| 395 | }, |
Lars-Peter Clausen | 1d0d879 | 2012-02-21 18:38:13 +0100 | [diff] [blame] | 396 | }; |
| 397 | |
Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 398 | static inline unsigned int ad5064_num_vref(struct ad5064_state *st) |
| 399 | { |
Lars-Peter Clausen | 83c169d | 2012-02-21 18:38:14 +0100 | [diff] [blame] | 400 | return st->chip_info->shared_vref ? 1 : st->chip_info->num_channels; |
Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 401 | } |
| 402 | |
| 403 | static const char * const ad5064_vref_names[] = { |
| 404 | "vrefA", |
| 405 | "vrefB", |
| 406 | "vrefC", |
| 407 | "vrefD", |
| 408 | }; |
| 409 | |
| 410 | static const char * const ad5064_vref_name(struct ad5064_state *st, |
| 411 | unsigned int vref) |
| 412 | { |
| 413 | return st->chip_info->shared_vref ? "vref" : ad5064_vref_names[vref]; |
| 414 | } |
| 415 | |
| 416 | static int __devinit ad5064_probe(struct spi_device *spi) |
| 417 | { |
| 418 | enum ad5064_type type = spi_get_device_id(spi)->driver_data; |
| 419 | struct iio_dev *indio_dev; |
| 420 | struct ad5064_state *st; |
| 421 | unsigned int i; |
| 422 | int ret; |
| 423 | |
Lars-Peter Clausen | 7cbb753 | 2012-04-26 13:35:01 +0200 | [diff] [blame] | 424 | indio_dev = iio_device_alloc(sizeof(*st)); |
Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 425 | if (indio_dev == NULL) |
| 426 | return -ENOMEM; |
| 427 | |
| 428 | st = iio_priv(indio_dev); |
| 429 | spi_set_drvdata(spi, indio_dev); |
| 430 | |
| 431 | st->chip_info = &ad5064_chip_info_tbl[type]; |
| 432 | st->spi = spi; |
| 433 | |
| 434 | for (i = 0; i < ad5064_num_vref(st); ++i) |
| 435 | st->vref_reg[i].supply = ad5064_vref_name(st, i); |
| 436 | |
| 437 | ret = regulator_bulk_get(&st->spi->dev, ad5064_num_vref(st), |
| 438 | st->vref_reg); |
Lars-Peter Clausen | bb92ff3 | 2012-02-21 18:38:16 +0100 | [diff] [blame] | 439 | if (ret) { |
| 440 | if (!st->chip_info->internal_vref) |
| 441 | goto error_free; |
| 442 | st->use_internal_vref = true; |
| 443 | ret = ad5064_spi_write(st, AD5064_CMD_CONFIG, 0, |
| 444 | AD5064_CONFIG_INT_VREF_ENABLE, 0); |
| 445 | if (ret) { |
| 446 | dev_err(&spi->dev, "Failed to enable internal vref: %d\n", |
| 447 | ret); |
| 448 | goto error_free; |
| 449 | } |
| 450 | } else { |
| 451 | ret = regulator_bulk_enable(ad5064_num_vref(st), st->vref_reg); |
| 452 | if (ret) |
| 453 | goto error_free_reg; |
| 454 | } |
Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 455 | |
Lars-Peter Clausen | 83c169d | 2012-02-21 18:38:14 +0100 | [diff] [blame] | 456 | for (i = 0; i < st->chip_info->num_channels; ++i) { |
Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 457 | st->pwr_down_mode[i] = AD5064_LDAC_PWRDN_1K; |
| 458 | st->dac_cache[i] = 0x8000; |
| 459 | } |
| 460 | |
| 461 | indio_dev->dev.parent = &spi->dev; |
| 462 | indio_dev->name = spi_get_device_id(spi)->name; |
| 463 | indio_dev->info = &ad5064_info; |
| 464 | indio_dev->modes = INDIO_DIRECT_MODE; |
Lars-Peter Clausen | 83c169d | 2012-02-21 18:38:14 +0100 | [diff] [blame] | 465 | indio_dev->channels = st->chip_info->channels; |
| 466 | indio_dev->num_channels = st->chip_info->num_channels; |
Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 467 | |
| 468 | ret = iio_device_register(indio_dev); |
| 469 | if (ret) |
| 470 | goto error_disable_reg; |
| 471 | |
| 472 | return 0; |
| 473 | |
| 474 | error_disable_reg: |
Lars-Peter Clausen | bb92ff3 | 2012-02-21 18:38:16 +0100 | [diff] [blame] | 475 | if (!st->use_internal_vref) |
| 476 | regulator_bulk_disable(ad5064_num_vref(st), st->vref_reg); |
Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 477 | error_free_reg: |
Lars-Peter Clausen | bb92ff3 | 2012-02-21 18:38:16 +0100 | [diff] [blame] | 478 | if (!st->use_internal_vref) |
| 479 | regulator_bulk_free(ad5064_num_vref(st), st->vref_reg); |
Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 480 | error_free: |
Lars-Peter Clausen | 7cbb753 | 2012-04-26 13:35:01 +0200 | [diff] [blame] | 481 | iio_device_free(indio_dev); |
Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 482 | |
| 483 | return ret; |
| 484 | } |
| 485 | |
| 486 | |
| 487 | static int __devexit ad5064_remove(struct spi_device *spi) |
| 488 | { |
| 489 | struct iio_dev *indio_dev = spi_get_drvdata(spi); |
| 490 | struct ad5064_state *st = iio_priv(indio_dev); |
| 491 | |
| 492 | iio_device_unregister(indio_dev); |
| 493 | |
Lars-Peter Clausen | bb92ff3 | 2012-02-21 18:38:16 +0100 | [diff] [blame] | 494 | if (!st->use_internal_vref) { |
| 495 | regulator_bulk_disable(ad5064_num_vref(st), st->vref_reg); |
| 496 | regulator_bulk_free(ad5064_num_vref(st), st->vref_reg); |
| 497 | } |
Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 498 | |
Lars-Peter Clausen | 7cbb753 | 2012-04-26 13:35:01 +0200 | [diff] [blame] | 499 | iio_device_free(indio_dev); |
Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 500 | |
| 501 | return 0; |
| 502 | } |
| 503 | |
| 504 | static const struct spi_device_id ad5064_id[] = { |
| 505 | {"ad5024", ID_AD5024}, |
Lars-Peter Clausen | f8be4af | 2012-02-21 18:38:15 +0100 | [diff] [blame] | 506 | {"ad5025", ID_AD5025}, |
Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 507 | {"ad5044", ID_AD5044}, |
Lars-Peter Clausen | f8be4af | 2012-02-21 18:38:15 +0100 | [diff] [blame] | 508 | {"ad5045", ID_AD5045}, |
Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 509 | {"ad5064", ID_AD5064}, |
| 510 | {"ad5064-1", ID_AD5064_1}, |
Lars-Peter Clausen | f8be4af | 2012-02-21 18:38:15 +0100 | [diff] [blame] | 511 | {"ad5065", ID_AD5065}, |
Lars-Peter Clausen | bb92ff3 | 2012-02-21 18:38:16 +0100 | [diff] [blame] | 512 | {"ad5628-1", ID_AD5628_1}, |
| 513 | {"ad5628-2", ID_AD5628_2}, |
| 514 | {"ad5648-1", ID_AD5648_1}, |
| 515 | {"ad5648-2", ID_AD5648_2}, |
Lars-Peter Clausen | 64f4eaa | 2012-02-21 18:38:17 +0100 | [diff] [blame] | 516 | {"ad5666-1", ID_AD5666_1}, |
| 517 | {"ad5666-2", ID_AD5666_2}, |
Lars-Peter Clausen | bb92ff3 | 2012-02-21 18:38:16 +0100 | [diff] [blame] | 518 | {"ad5668-1", ID_AD5668_1}, |
| 519 | {"ad5668-2", ID_AD5668_2}, |
| 520 | {"ad5668-3", ID_AD5668_2}, /* similar enough to ad5668-2 */ |
Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 521 | {} |
| 522 | }; |
| 523 | MODULE_DEVICE_TABLE(spi, ad5064_id); |
| 524 | |
| 525 | static struct spi_driver ad5064_driver = { |
| 526 | .driver = { |
| 527 | .name = "ad5064", |
| 528 | .owner = THIS_MODULE, |
| 529 | }, |
| 530 | .probe = ad5064_probe, |
| 531 | .remove = __devexit_p(ad5064_remove), |
| 532 | .id_table = ad5064_id, |
| 533 | }; |
Lars-Peter Clausen | ae6ae6f | 2011-11-16 10:13:39 +0100 | [diff] [blame] | 534 | module_spi_driver(ad5064_driver); |
Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 535 | |
| 536 | MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); |
Lars-Peter Clausen | 64f4eaa | 2012-02-21 18:38:17 +0100 | [diff] [blame] | 537 | MODULE_DESCRIPTION("Analog Devices AD5024/25/44/45/64/64-1/65, AD5628/48/66/68 DAC"); |
Lars-Peter Clausen | fcf265d | 2011-10-18 09:33:03 +0200 | [diff] [blame] | 538 | MODULE_LICENSE("GPL v2"); |