1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * ti-dac5571.c - Texas Instruments 8/10/12-bit 1/4-channel DAC driver 4 * 5 * Copyright (C) 2018 Prevas A/S 6 * 7 * https://www.ti.com/lit/ds/symlink/dac5571.pdf 8 * https://www.ti.com/lit/ds/symlink/dac6571.pdf 9 * https://www.ti.com/lit/ds/symlink/dac7571.pdf 10 * https://www.ti.com/lit/ds/symlink/dac5574.pdf 11 * https://www.ti.com/lit/ds/symlink/dac6574.pdf 12 * https://www.ti.com/lit/ds/symlink/dac7574.pdf 13 * https://www.ti.com/lit/ds/symlink/dac5573.pdf 14 * https://www.ti.com/lit/ds/symlink/dac6573.pdf 15 * https://www.ti.com/lit/ds/symlink/dac7573.pdf 16 */ 17 18 #include <linux/iio/iio.h> 19 #include <linux/i2c.h> 20 #include <linux/module.h> 21 #include <linux/mod_devicetable.h> 22 #include <linux/property.h> 23 #include <linux/regulator/consumer.h> 24 25 enum chip_id { 26 single_8bit, single_10bit, single_12bit, 27 quad_8bit, quad_10bit, quad_12bit 28 }; 29 30 struct dac5571_spec { 31 u8 num_channels; 32 u8 resolution; 33 }; 34 35 static const struct dac5571_spec dac5571_spec[] = { 36 [single_8bit] = {.num_channels = 1, .resolution = 8}, 37 [single_10bit] = {.num_channels = 1, .resolution = 10}, 38 [single_12bit] = {.num_channels = 1, .resolution = 12}, 39 [quad_8bit] = {.num_channels = 4, .resolution = 8}, 40 [quad_10bit] = {.num_channels = 4, .resolution = 10}, 41 [quad_12bit] = {.num_channels = 4, .resolution = 12}, 42 }; 43 44 struct dac5571_data { 45 struct i2c_client *client; 46 int id; 47 struct mutex lock; 48 struct regulator *vref; 49 u16 val[4]; 50 bool powerdown[4]; 51 u8 powerdown_mode[4]; 52 struct dac5571_spec const *spec; 53 int (*dac5571_cmd)(struct dac5571_data *data, int channel, u16 val); 54 int (*dac5571_pwrdwn)(struct dac5571_data *data, int channel, u8 pwrdwn); 55 u8 buf[3] ____cacheline_aligned; 56 }; 57 58 #define DAC5571_POWERDOWN(mode) ((mode) + 1) 59 #define DAC5571_POWERDOWN_FLAG BIT(0) 60 #define DAC5571_CHANNEL_SELECT 1 61 #define DAC5571_LOADMODE_DIRECT BIT(4) 62 #define DAC5571_SINGLE_PWRDWN_BITS 4 63 #define DAC5571_QUAD_PWRDWN_BITS 6 64 65 static int dac5571_cmd_single(struct dac5571_data *data, int channel, u16 val) 66 { 67 unsigned int shift; 68 69 shift = 12 - data->spec->resolution; 70 data->buf[1] = val << shift; 71 data->buf[0] = val >> (8 - shift); 72 73 if (i2c_master_send(data->client, data->buf, 2) != 2) 74 return -EIO; 75 76 return 0; 77 } 78 79 static int dac5571_cmd_quad(struct dac5571_data *data, int channel, u16 val) 80 { 81 unsigned int shift; 82 83 shift = 16 - data->spec->resolution; 84 data->buf[2] = val << shift; 85 data->buf[1] = (val >> (8 - shift)); 86 data->buf[0] = (channel << DAC5571_CHANNEL_SELECT) | 87 DAC5571_LOADMODE_DIRECT; 88 89 if (i2c_master_send(data->client, data->buf, 3) != 3) 90 return -EIO; 91 92 return 0; 93 } 94 95 static int dac5571_pwrdwn_single(struct dac5571_data *data, int channel, u8 pwrdwn) 96 { 97 data->buf[1] = 0; 98 data->buf[0] = pwrdwn << DAC5571_SINGLE_PWRDWN_BITS; 99 100 if (i2c_master_send(data->client, data->buf, 2) != 2) 101 return -EIO; 102 103 return 0; 104 } 105 106 static int dac5571_pwrdwn_quad(struct dac5571_data *data, int channel, u8 pwrdwn) 107 { 108 data->buf[2] = 0; 109 data->buf[1] = pwrdwn << DAC5571_QUAD_PWRDWN_BITS; 110 data->buf[0] = (channel << DAC5571_CHANNEL_SELECT) | 111 DAC5571_LOADMODE_DIRECT | DAC5571_POWERDOWN_FLAG; 112 113 if (i2c_master_send(data->client, data->buf, 3) != 3) 114 return -EIO; 115 116 return 0; 117 } 118 119 static const char *const dac5571_powerdown_modes[] = { 120 "1kohm_to_gnd", "100kohm_to_gnd", "three_state", 121 }; 122 123 static int dac5571_get_powerdown_mode(struct iio_dev *indio_dev, 124 const struct iio_chan_spec *chan) 125 { 126 struct dac5571_data *data = iio_priv(indio_dev); 127 128 return data->powerdown_mode[chan->channel]; 129 } 130 131 static int dac5571_set_powerdown_mode(struct iio_dev *indio_dev, 132 const struct iio_chan_spec *chan, 133 unsigned int mode) 134 { 135 struct dac5571_data *data = iio_priv(indio_dev); 136 int ret = 0; 137 138 if (data->powerdown_mode[chan->channel] == mode) 139 return 0; 140 141 mutex_lock(&data->lock); 142 if (data->powerdown[chan->channel]) { 143 ret = data->dac5571_pwrdwn(data, chan->channel, 144 DAC5571_POWERDOWN(mode)); 145 if (ret) 146 goto out; 147 } 148 data->powerdown_mode[chan->channel] = mode; 149 150 out: 151 mutex_unlock(&data->lock); 152 153 return ret; 154 } 155 156 static const struct iio_enum dac5571_powerdown_mode = { 157 .items = dac5571_powerdown_modes, 158 .num_items = ARRAY_SIZE(dac5571_powerdown_modes), 159 .get = dac5571_get_powerdown_mode, 160 .set = dac5571_set_powerdown_mode, 161 }; 162 163 static ssize_t dac5571_read_powerdown(struct iio_dev *indio_dev, 164 uintptr_t private, 165 const struct iio_chan_spec *chan, 166 char *buf) 167 { 168 struct dac5571_data *data = iio_priv(indio_dev); 169 170 return sysfs_emit(buf, "%d\n", data->powerdown[chan->channel]); 171 } 172 173 static ssize_t dac5571_write_powerdown(struct iio_dev *indio_dev, 174 uintptr_t private, 175 const struct iio_chan_spec *chan, 176 const char *buf, size_t len) 177 { 178 struct dac5571_data *data = iio_priv(indio_dev); 179 bool powerdown; 180 int ret; 181 182 ret = kstrtobool(buf, &powerdown); 183 if (ret) 184 return ret; 185 186 if (data->powerdown[chan->channel] == powerdown) 187 return len; 188 189 mutex_lock(&data->lock); 190 if (powerdown) 191 ret = data->dac5571_pwrdwn(data, chan->channel, 192 DAC5571_POWERDOWN(data->powerdown_mode[chan->channel])); 193 else 194 ret = data->dac5571_cmd(data, chan->channel, 195 data->val[chan->channel]); 196 if (ret) 197 goto out; 198 199 data->powerdown[chan->channel] = powerdown; 200 201 out: 202 mutex_unlock(&data->lock); 203 204 return ret ? ret : len; 205 } 206 207 208 static const struct iio_chan_spec_ext_info dac5571_ext_info[] = { 209 { 210 .name = "powerdown", 211 .read = dac5571_read_powerdown, 212 .write = dac5571_write_powerdown, 213 .shared = IIO_SEPARATE, 214 }, 215 IIO_ENUM("powerdown_mode", IIO_SEPARATE, &dac5571_powerdown_mode), 216 IIO_ENUM_AVAILABLE("powerdown_mode", IIO_SHARED_BY_TYPE, &dac5571_powerdown_mode), 217 {}, 218 }; 219 220 #define dac5571_CHANNEL(chan, name) { \ 221 .type = IIO_VOLTAGE, \ 222 .channel = (chan), \ 223 .address = (chan), \ 224 .indexed = true, \ 225 .output = true, \ 226 .datasheet_name = name, \ 227 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ 228 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ 229 .ext_info = dac5571_ext_info, \ 230 } 231 232 static const struct iio_chan_spec dac5571_channels[] = { 233 dac5571_CHANNEL(0, "A"), 234 dac5571_CHANNEL(1, "B"), 235 dac5571_CHANNEL(2, "C"), 236 dac5571_CHANNEL(3, "D"), 237 }; 238 239 static int dac5571_read_raw(struct iio_dev *indio_dev, 240 struct iio_chan_spec const *chan, 241 int *val, int *val2, long mask) 242 { 243 struct dac5571_data *data = iio_priv(indio_dev); 244 int ret; 245 246 switch (mask) { 247 case IIO_CHAN_INFO_RAW: 248 *val = data->val[chan->channel]; 249 return IIO_VAL_INT; 250 251 case IIO_CHAN_INFO_SCALE: 252 ret = regulator_get_voltage(data->vref); 253 if (ret < 0) 254 return ret; 255 256 *val = ret / 1000; 257 *val2 = data->spec->resolution; 258 return IIO_VAL_FRACTIONAL_LOG2; 259 260 default: 261 return -EINVAL; 262 } 263 } 264 265 static int dac5571_write_raw(struct iio_dev *indio_dev, 266 struct iio_chan_spec const *chan, 267 int val, int val2, long mask) 268 { 269 struct dac5571_data *data = iio_priv(indio_dev); 270 int ret; 271 272 switch (mask) { 273 case IIO_CHAN_INFO_RAW: 274 if (data->val[chan->channel] == val) 275 return 0; 276 277 if (val >= (1 << data->spec->resolution) || val < 0) 278 return -EINVAL; 279 280 if (data->powerdown[chan->channel]) 281 return -EBUSY; 282 283 mutex_lock(&data->lock); 284 ret = data->dac5571_cmd(data, chan->channel, val); 285 if (ret == 0) 286 data->val[chan->channel] = val; 287 mutex_unlock(&data->lock); 288 return ret; 289 290 default: 291 return -EINVAL; 292 } 293 } 294 295 static int dac5571_write_raw_get_fmt(struct iio_dev *indio_dev, 296 struct iio_chan_spec const *chan, 297 long mask) 298 { 299 return IIO_VAL_INT; 300 } 301 302 static const struct iio_info dac5571_info = { 303 .read_raw = dac5571_read_raw, 304 .write_raw = dac5571_write_raw, 305 .write_raw_get_fmt = dac5571_write_raw_get_fmt, 306 }; 307 308 static int dac5571_probe(struct i2c_client *client, 309 const struct i2c_device_id *id) 310 { 311 struct device *dev = &client->dev; 312 const struct dac5571_spec *spec; 313 struct dac5571_data *data; 314 struct iio_dev *indio_dev; 315 enum chip_id chip_id; 316 int ret, i; 317 318 indio_dev = devm_iio_device_alloc(dev, sizeof(*data)); 319 if (!indio_dev) 320 return -ENOMEM; 321 322 data = iio_priv(indio_dev); 323 i2c_set_clientdata(client, indio_dev); 324 data->client = client; 325 326 indio_dev->info = &dac5571_info; 327 indio_dev->name = id->name; 328 indio_dev->modes = INDIO_DIRECT_MODE; 329 indio_dev->channels = dac5571_channels; 330 331 if (dev_fwnode(dev)) 332 chip_id = (uintptr_t)device_get_match_data(dev); 333 else 334 chip_id = id->driver_data; 335 336 spec = &dac5571_spec[chip_id]; 337 338 indio_dev->num_channels = spec->num_channels; 339 data->spec = spec; 340 341 data->vref = devm_regulator_get(dev, "vref"); 342 if (IS_ERR(data->vref)) 343 return PTR_ERR(data->vref); 344 345 ret = regulator_enable(data->vref); 346 if (ret < 0) 347 return ret; 348 349 mutex_init(&data->lock); 350 351 switch (spec->num_channels) { 352 case 1: 353 data->dac5571_cmd = dac5571_cmd_single; 354 data->dac5571_pwrdwn = dac5571_pwrdwn_single; 355 break; 356 case 4: 357 data->dac5571_cmd = dac5571_cmd_quad; 358 data->dac5571_pwrdwn = dac5571_pwrdwn_quad; 359 break; 360 default: 361 ret = -EINVAL; 362 goto err; 363 } 364 365 for (i = 0; i < spec->num_channels; i++) { 366 ret = data->dac5571_cmd(data, i, 0); 367 if (ret) { 368 dev_err(dev, "failed to initialize channel %d to 0\n", i); 369 goto err; 370 } 371 } 372 373 ret = iio_device_register(indio_dev); 374 if (ret) 375 goto err; 376 377 return 0; 378 379 err: 380 regulator_disable(data->vref); 381 return ret; 382 } 383 384 static int dac5571_remove(struct i2c_client *i2c) 385 { 386 struct iio_dev *indio_dev = i2c_get_clientdata(i2c); 387 struct dac5571_data *data = iio_priv(indio_dev); 388 389 iio_device_unregister(indio_dev); 390 regulator_disable(data->vref); 391 392 return 0; 393 } 394 395 static const struct of_device_id dac5571_of_id[] = { 396 {.compatible = "ti,dac5571", .data = (void *)single_8bit}, 397 {.compatible = "ti,dac6571", .data = (void *)single_10bit}, 398 {.compatible = "ti,dac7571", .data = (void *)single_12bit}, 399 {.compatible = "ti,dac5574", .data = (void *)quad_8bit}, 400 {.compatible = "ti,dac6574", .data = (void *)quad_10bit}, 401 {.compatible = "ti,dac7574", .data = (void *)quad_12bit}, 402 {.compatible = "ti,dac5573", .data = (void *)quad_8bit}, 403 {.compatible = "ti,dac6573", .data = (void *)quad_10bit}, 404 {.compatible = "ti,dac7573", .data = (void *)quad_12bit}, 405 {} 406 }; 407 MODULE_DEVICE_TABLE(of, dac5571_of_id); 408 409 static const struct i2c_device_id dac5571_id[] = { 410 {"dac5571", single_8bit}, 411 {"dac6571", single_10bit}, 412 {"dac7571", single_12bit}, 413 {"dac5574", quad_8bit}, 414 {"dac6574", quad_10bit}, 415 {"dac7574", quad_12bit}, 416 {"dac5573", quad_8bit}, 417 {"dac6573", quad_10bit}, 418 {"dac7573", quad_12bit}, 419 {} 420 }; 421 MODULE_DEVICE_TABLE(i2c, dac5571_id); 422 423 static struct i2c_driver dac5571_driver = { 424 .driver = { 425 .name = "ti-dac5571", 426 .of_match_table = dac5571_of_id, 427 }, 428 .probe = dac5571_probe, 429 .remove = dac5571_remove, 430 .id_table = dac5571_id, 431 }; 432 module_i2c_driver(dac5571_driver); 433 434 MODULE_AUTHOR("Sean Nyekjaer <sean@geanix.dk>"); 435 MODULE_DESCRIPTION("Texas Instruments 8/10/12-bit 1/4-channel DAC driver"); 436 MODULE_LICENSE("GPL v2"); 437