ti-dac5571.c 10 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428
  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. #include <linux/iio/iio.h>
  18. #include <linux/i2c.h>
  19. #include <linux/module.h>
  20. #include <linux/mod_devicetable.h>
  21. #include <linux/regulator/consumer.h>
  22. enum chip_id {
  23. single_8bit, single_10bit, single_12bit,
  24. quad_8bit, quad_10bit, quad_12bit
  25. };
  26. struct dac5571_spec {
  27. u8 num_channels;
  28. u8 resolution;
  29. };
  30. static const struct dac5571_spec dac5571_spec[] = {
  31. [single_8bit] = {.num_channels = 1, .resolution = 8},
  32. [single_10bit] = {.num_channels = 1, .resolution = 10},
  33. [single_12bit] = {.num_channels = 1, .resolution = 12},
  34. [quad_8bit] = {.num_channels = 4, .resolution = 8},
  35. [quad_10bit] = {.num_channels = 4, .resolution = 10},
  36. [quad_12bit] = {.num_channels = 4, .resolution = 12},
  37. };
  38. struct dac5571_data {
  39. struct i2c_client *client;
  40. int id;
  41. struct mutex lock;
  42. struct regulator *vref;
  43. u16 val[4];
  44. bool powerdown[4];
  45. u8 powerdown_mode[4];
  46. struct dac5571_spec const *spec;
  47. int (*dac5571_cmd)(struct dac5571_data *data, int channel, u16 val);
  48. int (*dac5571_pwrdwn)(struct dac5571_data *data, int channel, u8 pwrdwn);
  49. u8 buf[3] ____cacheline_aligned;
  50. };
  51. #define DAC5571_POWERDOWN(mode) ((mode) + 1)
  52. #define DAC5571_POWERDOWN_FLAG BIT(0)
  53. #define DAC5571_CHANNEL_SELECT 1
  54. #define DAC5571_LOADMODE_DIRECT BIT(4)
  55. #define DAC5571_SINGLE_PWRDWN_BITS 4
  56. #define DAC5571_QUAD_PWRDWN_BITS 6
  57. static int dac5571_cmd_single(struct dac5571_data *data, int channel, u16 val)
  58. {
  59. unsigned int shift;
  60. shift = 12 - data->spec->resolution;
  61. data->buf[1] = val << shift;
  62. data->buf[0] = val >> (8 - shift);
  63. if (i2c_master_send(data->client, data->buf, 2) != 2)
  64. return -EIO;
  65. return 0;
  66. }
  67. static int dac5571_cmd_quad(struct dac5571_data *data, int channel, u16 val)
  68. {
  69. unsigned int shift;
  70. shift = 16 - data->spec->resolution;
  71. data->buf[2] = val << shift;
  72. data->buf[1] = (val >> (8 - shift));
  73. data->buf[0] = (channel << DAC5571_CHANNEL_SELECT) |
  74. DAC5571_LOADMODE_DIRECT;
  75. if (i2c_master_send(data->client, data->buf, 3) != 3)
  76. return -EIO;
  77. return 0;
  78. }
  79. static int dac5571_pwrdwn_single(struct dac5571_data *data, int channel, u8 pwrdwn)
  80. {
  81. data->buf[1] = 0;
  82. data->buf[0] = pwrdwn << DAC5571_SINGLE_PWRDWN_BITS;
  83. if (i2c_master_send(data->client, data->buf, 2) != 2)
  84. return -EIO;
  85. return 0;
  86. }
  87. static int dac5571_pwrdwn_quad(struct dac5571_data *data, int channel, u8 pwrdwn)
  88. {
  89. data->buf[2] = 0;
  90. data->buf[1] = pwrdwn << DAC5571_QUAD_PWRDWN_BITS;
  91. data->buf[0] = (channel << DAC5571_CHANNEL_SELECT) |
  92. DAC5571_LOADMODE_DIRECT | DAC5571_POWERDOWN_FLAG;
  93. if (i2c_master_send(data->client, data->buf, 3) != 3)
  94. return -EIO;
  95. return 0;
  96. }
  97. static const char *const dac5571_powerdown_modes[] = {
  98. "1kohm_to_gnd", "100kohm_to_gnd", "three_state",
  99. };
  100. static int dac5571_get_powerdown_mode(struct iio_dev *indio_dev,
  101. const struct iio_chan_spec *chan)
  102. {
  103. struct dac5571_data *data = iio_priv(indio_dev);
  104. return data->powerdown_mode[chan->channel];
  105. }
  106. static int dac5571_set_powerdown_mode(struct iio_dev *indio_dev,
  107. const struct iio_chan_spec *chan,
  108. unsigned int mode)
  109. {
  110. struct dac5571_data *data = iio_priv(indio_dev);
  111. int ret = 0;
  112. if (data->powerdown_mode[chan->channel] == mode)
  113. return 0;
  114. mutex_lock(&data->lock);
  115. if (data->powerdown[chan->channel]) {
  116. ret = data->dac5571_pwrdwn(data, chan->channel,
  117. DAC5571_POWERDOWN(mode));
  118. if (ret)
  119. goto out;
  120. }
  121. data->powerdown_mode[chan->channel] = mode;
  122. out:
  123. mutex_unlock(&data->lock);
  124. return ret;
  125. }
  126. static const struct iio_enum dac5571_powerdown_mode = {
  127. .items = dac5571_powerdown_modes,
  128. .num_items = ARRAY_SIZE(dac5571_powerdown_modes),
  129. .get = dac5571_get_powerdown_mode,
  130. .set = dac5571_set_powerdown_mode,
  131. };
  132. static ssize_t dac5571_read_powerdown(struct iio_dev *indio_dev,
  133. uintptr_t private,
  134. const struct iio_chan_spec *chan,
  135. char *buf)
  136. {
  137. struct dac5571_data *data = iio_priv(indio_dev);
  138. return sprintf(buf, "%d\n", data->powerdown[chan->channel]);
  139. }
  140. static ssize_t dac5571_write_powerdown(struct iio_dev *indio_dev,
  141. uintptr_t private,
  142. const struct iio_chan_spec *chan,
  143. const char *buf, size_t len)
  144. {
  145. struct dac5571_data *data = iio_priv(indio_dev);
  146. bool powerdown;
  147. int ret;
  148. ret = strtobool(buf, &powerdown);
  149. if (ret)
  150. return ret;
  151. if (data->powerdown[chan->channel] == powerdown)
  152. return len;
  153. mutex_lock(&data->lock);
  154. if (powerdown)
  155. ret = data->dac5571_pwrdwn(data, chan->channel,
  156. DAC5571_POWERDOWN(data->powerdown_mode[chan->channel]));
  157. else
  158. ret = data->dac5571_cmd(data, chan->channel,
  159. data->val[chan->channel]);
  160. if (ret)
  161. goto out;
  162. data->powerdown[chan->channel] = powerdown;
  163. out:
  164. mutex_unlock(&data->lock);
  165. return ret ? ret : len;
  166. }
  167. static const struct iio_chan_spec_ext_info dac5571_ext_info[] = {
  168. {
  169. .name = "powerdown",
  170. .read = dac5571_read_powerdown,
  171. .write = dac5571_write_powerdown,
  172. .shared = IIO_SEPARATE,
  173. },
  174. IIO_ENUM("powerdown_mode", IIO_SEPARATE, &dac5571_powerdown_mode),
  175. IIO_ENUM_AVAILABLE("powerdown_mode", &dac5571_powerdown_mode),
  176. {},
  177. };
  178. #define dac5571_CHANNEL(chan, name) { \
  179. .type = IIO_VOLTAGE, \
  180. .channel = (chan), \
  181. .address = (chan), \
  182. .indexed = true, \
  183. .output = true, \
  184. .datasheet_name = name, \
  185. .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
  186. .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
  187. .ext_info = dac5571_ext_info, \
  188. }
  189. static const struct iio_chan_spec dac5571_channels[] = {
  190. dac5571_CHANNEL(0, "A"),
  191. dac5571_CHANNEL(1, "B"),
  192. dac5571_CHANNEL(2, "C"),
  193. dac5571_CHANNEL(3, "D"),
  194. };
  195. static int dac5571_read_raw(struct iio_dev *indio_dev,
  196. struct iio_chan_spec const *chan,
  197. int *val, int *val2, long mask)
  198. {
  199. struct dac5571_data *data = iio_priv(indio_dev);
  200. int ret;
  201. switch (mask) {
  202. case IIO_CHAN_INFO_RAW:
  203. *val = data->val[chan->channel];
  204. return IIO_VAL_INT;
  205. case IIO_CHAN_INFO_SCALE:
  206. ret = regulator_get_voltage(data->vref);
  207. if (ret < 0)
  208. return ret;
  209. *val = ret / 1000;
  210. *val2 = data->spec->resolution;
  211. return IIO_VAL_FRACTIONAL_LOG2;
  212. default:
  213. return -EINVAL;
  214. }
  215. }
  216. static int dac5571_write_raw(struct iio_dev *indio_dev,
  217. struct iio_chan_spec const *chan,
  218. int val, int val2, long mask)
  219. {
  220. struct dac5571_data *data = iio_priv(indio_dev);
  221. int ret;
  222. switch (mask) {
  223. case IIO_CHAN_INFO_RAW:
  224. if (data->val[chan->channel] == val)
  225. return 0;
  226. if (val >= (1 << data->spec->resolution) || val < 0)
  227. return -EINVAL;
  228. if (data->powerdown[chan->channel])
  229. return -EBUSY;
  230. mutex_lock(&data->lock);
  231. ret = data->dac5571_cmd(data, chan->channel, val);
  232. if (ret == 0)
  233. data->val[chan->channel] = val;
  234. mutex_unlock(&data->lock);
  235. return ret;
  236. default:
  237. return -EINVAL;
  238. }
  239. }
  240. static int dac5571_write_raw_get_fmt(struct iio_dev *indio_dev,
  241. struct iio_chan_spec const *chan,
  242. long mask)
  243. {
  244. return IIO_VAL_INT;
  245. }
  246. static const struct iio_info dac5571_info = {
  247. .read_raw = dac5571_read_raw,
  248. .write_raw = dac5571_write_raw,
  249. .write_raw_get_fmt = dac5571_write_raw_get_fmt,
  250. };
  251. static int dac5571_probe(struct i2c_client *client,
  252. const struct i2c_device_id *id)
  253. {
  254. struct device *dev = &client->dev;
  255. const struct dac5571_spec *spec;
  256. struct dac5571_data *data;
  257. struct iio_dev *indio_dev;
  258. int ret, i;
  259. indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
  260. if (!indio_dev)
  261. return -ENOMEM;
  262. data = iio_priv(indio_dev);
  263. i2c_set_clientdata(client, indio_dev);
  264. data->client = client;
  265. indio_dev->info = &dac5571_info;
  266. indio_dev->name = id->name;
  267. indio_dev->modes = INDIO_DIRECT_MODE;
  268. indio_dev->channels = dac5571_channels;
  269. spec = &dac5571_spec[id->driver_data];
  270. indio_dev->num_channels = spec->num_channels;
  271. data->spec = spec;
  272. data->vref = devm_regulator_get(dev, "vref");
  273. if (IS_ERR(data->vref))
  274. return PTR_ERR(data->vref);
  275. ret = regulator_enable(data->vref);
  276. if (ret < 0)
  277. return ret;
  278. mutex_init(&data->lock);
  279. switch (spec->num_channels) {
  280. case 1:
  281. data->dac5571_cmd = dac5571_cmd_single;
  282. data->dac5571_pwrdwn = dac5571_pwrdwn_single;
  283. break;
  284. case 4:
  285. data->dac5571_cmd = dac5571_cmd_quad;
  286. data->dac5571_pwrdwn = dac5571_pwrdwn_quad;
  287. break;
  288. default:
  289. ret = -EINVAL;
  290. goto err;
  291. }
  292. for (i = 0; i < spec->num_channels; i++) {
  293. ret = data->dac5571_cmd(data, i, 0);
  294. if (ret) {
  295. dev_err(dev, "failed to initialize channel %d to 0\n", i);
  296. goto err;
  297. }
  298. }
  299. ret = iio_device_register(indio_dev);
  300. if (ret)
  301. goto err;
  302. return 0;
  303. err:
  304. regulator_disable(data->vref);
  305. return ret;
  306. }
  307. static int dac5571_remove(struct i2c_client *i2c)
  308. {
  309. struct iio_dev *indio_dev = i2c_get_clientdata(i2c);
  310. struct dac5571_data *data = iio_priv(indio_dev);
  311. iio_device_unregister(indio_dev);
  312. regulator_disable(data->vref);
  313. return 0;
  314. }
  315. static const struct of_device_id dac5571_of_id[] = {
  316. {.compatible = "ti,dac5571"},
  317. {.compatible = "ti,dac6571"},
  318. {.compatible = "ti,dac7571"},
  319. {.compatible = "ti,dac5574"},
  320. {.compatible = "ti,dac6574"},
  321. {.compatible = "ti,dac7574"},
  322. {.compatible = "ti,dac5573"},
  323. {.compatible = "ti,dac6573"},
  324. {.compatible = "ti,dac7573"},
  325. {}
  326. };
  327. MODULE_DEVICE_TABLE(of, dac5571_of_id);
  328. static const struct i2c_device_id dac5571_id[] = {
  329. {"dac5571", single_8bit},
  330. {"dac6571", single_10bit},
  331. {"dac7571", single_12bit},
  332. {"dac5574", quad_8bit},
  333. {"dac6574", quad_10bit},
  334. {"dac7574", quad_12bit},
  335. {"dac5573", quad_8bit},
  336. {"dac6573", quad_10bit},
  337. {"dac7573", quad_12bit},
  338. {}
  339. };
  340. MODULE_DEVICE_TABLE(i2c, dac5571_id);
  341. static struct i2c_driver dac5571_driver = {
  342. .driver = {
  343. .name = "ti-dac5571",
  344. .of_match_table = dac5571_of_id,
  345. },
  346. .probe = dac5571_probe,
  347. .remove = dac5571_remove,
  348. .id_table = dac5571_id,
  349. };
  350. module_i2c_driver(dac5571_driver);
  351. MODULE_AUTHOR("Sean Nyekjaer <sean@geanix.dk>");
  352. MODULE_DESCRIPTION("Texas Instruments 8/10/12-bit 1/4-channel DAC driver");
  353. MODULE_LICENSE("GPL v2");