This source file includes following definitions.
- ad5504_spi_write
- ad5504_spi_read
- ad5504_read_raw
- ad5504_write_raw
- ad5504_get_powerdown_mode
- ad5504_set_powerdown_mode
- ad5504_read_dac_powerdown
- ad5504_write_dac_powerdown
- ad5504_event_handler
- ad5504_probe
- ad5504_remove
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8 #include <linux/interrupt.h>
9 #include <linux/fs.h>
10 #include <linux/device.h>
11 #include <linux/kernel.h>
12 #include <linux/spi/spi.h>
13 #include <linux/slab.h>
14 #include <linux/sysfs.h>
15 #include <linux/regulator/consumer.h>
16 #include <linux/module.h>
17 #include <linux/bitops.h>
18
19 #include <linux/iio/iio.h>
20 #include <linux/iio/sysfs.h>
21 #include <linux/iio/events.h>
22 #include <linux/iio/dac/ad5504.h>
23
24 #define AD5504_RES_MASK GENMASK(11, 0)
25 #define AD5504_CMD_READ BIT(15)
26 #define AD5504_CMD_WRITE 0
27 #define AD5504_ADDR(addr) ((addr) << 12)
28
29
30 #define AD5504_ADDR_NOOP 0
31 #define AD5504_ADDR_DAC(x) ((x) + 1)
32 #define AD5504_ADDR_ALL_DAC 5
33 #define AD5504_ADDR_CTRL 7
34
35
36 #define AD5504_DAC_PWR(ch) ((ch) << 2)
37 #define AD5504_DAC_PWRDWN_MODE(mode) ((mode) << 6)
38 #define AD5504_DAC_PWRDN_20K 0
39 #define AD5504_DAC_PWRDN_3STATE 1
40
41
42
43
44
45
46
47
48
49
50 struct ad5504_state {
51 struct spi_device *spi;
52 struct regulator *reg;
53 unsigned short vref_mv;
54 unsigned pwr_down_mask;
55 unsigned pwr_down_mode;
56
57 __be16 data[2] ____cacheline_aligned;
58 };
59
60
61
62
63
64 enum ad5504_supported_device_ids {
65 ID_AD5504,
66 ID_AD5501,
67 };
68
69 static int ad5504_spi_write(struct ad5504_state *st, u8 addr, u16 val)
70 {
71 st->data[0] = cpu_to_be16(AD5504_CMD_WRITE | AD5504_ADDR(addr) |
72 (val & AD5504_RES_MASK));
73
74 return spi_write(st->spi, &st->data[0], 2);
75 }
76
77 static int ad5504_spi_read(struct ad5504_state *st, u8 addr)
78 {
79 int ret;
80 struct spi_transfer t = {
81 .tx_buf = &st->data[0],
82 .rx_buf = &st->data[1],
83 .len = 2,
84 };
85
86 st->data[0] = cpu_to_be16(AD5504_CMD_READ | AD5504_ADDR(addr));
87 ret = spi_sync_transfer(st->spi, &t, 1);
88 if (ret < 0)
89 return ret;
90
91 return be16_to_cpu(st->data[1]) & AD5504_RES_MASK;
92 }
93
94 static int ad5504_read_raw(struct iio_dev *indio_dev,
95 struct iio_chan_spec const *chan,
96 int *val,
97 int *val2,
98 long m)
99 {
100 struct ad5504_state *st = iio_priv(indio_dev);
101 int ret;
102
103 switch (m) {
104 case IIO_CHAN_INFO_RAW:
105 ret = ad5504_spi_read(st, chan->address);
106 if (ret < 0)
107 return ret;
108
109 *val = ret;
110
111 return IIO_VAL_INT;
112 case IIO_CHAN_INFO_SCALE:
113 *val = st->vref_mv;
114 *val2 = chan->scan_type.realbits;
115 return IIO_VAL_FRACTIONAL_LOG2;
116 }
117 return -EINVAL;
118 }
119
120 static int ad5504_write_raw(struct iio_dev *indio_dev,
121 struct iio_chan_spec const *chan,
122 int val,
123 int val2,
124 long mask)
125 {
126 struct ad5504_state *st = iio_priv(indio_dev);
127
128 switch (mask) {
129 case IIO_CHAN_INFO_RAW:
130 if (val >= (1 << chan->scan_type.realbits) || val < 0)
131 return -EINVAL;
132
133 return ad5504_spi_write(st, chan->address, val);
134 default:
135 return -EINVAL;
136 }
137 }
138
139 static const char * const ad5504_powerdown_modes[] = {
140 "20kohm_to_gnd",
141 "three_state",
142 };
143
144 static int ad5504_get_powerdown_mode(struct iio_dev *indio_dev,
145 const struct iio_chan_spec *chan)
146 {
147 struct ad5504_state *st = iio_priv(indio_dev);
148
149 return st->pwr_down_mode;
150 }
151
152 static int ad5504_set_powerdown_mode(struct iio_dev *indio_dev,
153 const struct iio_chan_spec *chan, unsigned int mode)
154 {
155 struct ad5504_state *st = iio_priv(indio_dev);
156
157 st->pwr_down_mode = mode;
158
159 return 0;
160 }
161
162 static const struct iio_enum ad5504_powerdown_mode_enum = {
163 .items = ad5504_powerdown_modes,
164 .num_items = ARRAY_SIZE(ad5504_powerdown_modes),
165 .get = ad5504_get_powerdown_mode,
166 .set = ad5504_set_powerdown_mode,
167 };
168
169 static ssize_t ad5504_read_dac_powerdown(struct iio_dev *indio_dev,
170 uintptr_t private, const struct iio_chan_spec *chan, char *buf)
171 {
172 struct ad5504_state *st = iio_priv(indio_dev);
173
174 return sprintf(buf, "%d\n",
175 !(st->pwr_down_mask & (1 << chan->channel)));
176 }
177
178 static ssize_t ad5504_write_dac_powerdown(struct iio_dev *indio_dev,
179 uintptr_t private, const struct iio_chan_spec *chan, const char *buf,
180 size_t len)
181 {
182 bool pwr_down;
183 int ret;
184 struct ad5504_state *st = iio_priv(indio_dev);
185
186 ret = strtobool(buf, &pwr_down);
187 if (ret)
188 return ret;
189
190 if (pwr_down)
191 st->pwr_down_mask |= (1 << chan->channel);
192 else
193 st->pwr_down_mask &= ~(1 << chan->channel);
194
195 ret = ad5504_spi_write(st, AD5504_ADDR_CTRL,
196 AD5504_DAC_PWRDWN_MODE(st->pwr_down_mode) |
197 AD5504_DAC_PWR(st->pwr_down_mask));
198
199
200 ad5504_spi_write(st, AD5504_ADDR_NOOP, 0);
201
202 return ret ? ret : len;
203 }
204
205 static IIO_CONST_ATTR(temp0_thresh_rising_value, "110000");
206 static IIO_CONST_ATTR(temp0_thresh_rising_en, "1");
207
208 static struct attribute *ad5504_ev_attributes[] = {
209 &iio_const_attr_temp0_thresh_rising_value.dev_attr.attr,
210 &iio_const_attr_temp0_thresh_rising_en.dev_attr.attr,
211 NULL,
212 };
213
214 static const struct attribute_group ad5504_ev_attribute_group = {
215 .attrs = ad5504_ev_attributes,
216 };
217
218 static irqreturn_t ad5504_event_handler(int irq, void *private)
219 {
220 iio_push_event(private,
221 IIO_UNMOD_EVENT_CODE(IIO_TEMP,
222 0,
223 IIO_EV_TYPE_THRESH,
224 IIO_EV_DIR_RISING),
225 iio_get_time_ns(private));
226
227 return IRQ_HANDLED;
228 }
229
230 static const struct iio_info ad5504_info = {
231 .write_raw = ad5504_write_raw,
232 .read_raw = ad5504_read_raw,
233 .event_attrs = &ad5504_ev_attribute_group,
234 };
235
236 static const struct iio_chan_spec_ext_info ad5504_ext_info[] = {
237 {
238 .name = "powerdown",
239 .read = ad5504_read_dac_powerdown,
240 .write = ad5504_write_dac_powerdown,
241 .shared = IIO_SEPARATE,
242 },
243 IIO_ENUM("powerdown_mode", IIO_SHARED_BY_TYPE,
244 &ad5504_powerdown_mode_enum),
245 IIO_ENUM_AVAILABLE("powerdown_mode", &ad5504_powerdown_mode_enum),
246 { },
247 };
248
249 #define AD5504_CHANNEL(_chan) { \
250 .type = IIO_VOLTAGE, \
251 .indexed = 1, \
252 .output = 1, \
253 .channel = (_chan), \
254 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
255 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
256 .address = AD5504_ADDR_DAC(_chan), \
257 .scan_type = { \
258 .sign = 'u', \
259 .realbits = 12, \
260 .storagebits = 16, \
261 }, \
262 .ext_info = ad5504_ext_info, \
263 }
264
265 static const struct iio_chan_spec ad5504_channels[] = {
266 AD5504_CHANNEL(0),
267 AD5504_CHANNEL(1),
268 AD5504_CHANNEL(2),
269 AD5504_CHANNEL(3),
270 };
271
272 static int ad5504_probe(struct spi_device *spi)
273 {
274 struct ad5504_platform_data *pdata = spi->dev.platform_data;
275 struct iio_dev *indio_dev;
276 struct ad5504_state *st;
277 struct regulator *reg;
278 int ret, voltage_uv = 0;
279
280 indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
281 if (!indio_dev)
282 return -ENOMEM;
283 reg = devm_regulator_get(&spi->dev, "vcc");
284 if (!IS_ERR(reg)) {
285 ret = regulator_enable(reg);
286 if (ret)
287 return ret;
288
289 ret = regulator_get_voltage(reg);
290 if (ret < 0)
291 goto error_disable_reg;
292
293 voltage_uv = ret;
294 }
295
296 spi_set_drvdata(spi, indio_dev);
297 st = iio_priv(indio_dev);
298 if (voltage_uv)
299 st->vref_mv = voltage_uv / 1000;
300 else if (pdata)
301 st->vref_mv = pdata->vref_mv;
302 else
303 dev_warn(&spi->dev, "reference voltage unspecified\n");
304
305 st->reg = reg;
306 st->spi = spi;
307 indio_dev->dev.parent = &spi->dev;
308 indio_dev->name = spi_get_device_id(st->spi)->name;
309 indio_dev->info = &ad5504_info;
310 if (spi_get_device_id(st->spi)->driver_data == ID_AD5501)
311 indio_dev->num_channels = 1;
312 else
313 indio_dev->num_channels = 4;
314 indio_dev->channels = ad5504_channels;
315 indio_dev->modes = INDIO_DIRECT_MODE;
316
317 if (spi->irq) {
318 ret = devm_request_threaded_irq(&spi->dev, spi->irq,
319 NULL,
320 &ad5504_event_handler,
321 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
322 spi_get_device_id(st->spi)->name,
323 indio_dev);
324 if (ret)
325 goto error_disable_reg;
326 }
327
328 ret = iio_device_register(indio_dev);
329 if (ret)
330 goto error_disable_reg;
331
332 return 0;
333
334 error_disable_reg:
335 if (!IS_ERR(reg))
336 regulator_disable(reg);
337
338 return ret;
339 }
340
341 static int ad5504_remove(struct spi_device *spi)
342 {
343 struct iio_dev *indio_dev = spi_get_drvdata(spi);
344 struct ad5504_state *st = iio_priv(indio_dev);
345
346 iio_device_unregister(indio_dev);
347
348 if (!IS_ERR(st->reg))
349 regulator_disable(st->reg);
350
351 return 0;
352 }
353
354 static const struct spi_device_id ad5504_id[] = {
355 {"ad5504", ID_AD5504},
356 {"ad5501", ID_AD5501},
357 {}
358 };
359 MODULE_DEVICE_TABLE(spi, ad5504_id);
360
361 static struct spi_driver ad5504_driver = {
362 .driver = {
363 .name = "ad5504",
364 },
365 .probe = ad5504_probe,
366 .remove = ad5504_remove,
367 .id_table = ad5504_id,
368 };
369 module_spi_driver(ad5504_driver);
370
371 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
372 MODULE_DESCRIPTION("Analog Devices AD5501/AD5501 DAC");
373 MODULE_LICENSE("GPL v2");