Commit | Line | Data |
---|---|---|
6790e29f BS |
1 | /* |
2 | * AD5624R, AD5644R, AD5664R Digital to analog convertors spi driver | |
3 | * | |
14f88f1b | 4 | * Copyright 2010-2011 Analog Devices Inc. |
6790e29f | 5 | * |
14f88f1b | 6 | * Licensed under the GPL-2. |
6790e29f BS |
7 | */ |
8 | ||
9 | #include <linux/interrupt.h> | |
6790e29f BS |
10 | #include <linux/fs.h> |
11 | #include <linux/device.h> | |
12 | #include <linux/kernel.h> | |
13 | #include <linux/spi/spi.h> | |
14 | #include <linux/slab.h> | |
15 | #include <linux/sysfs.h> | |
14f88f1b | 16 | #include <linux/regulator/consumer.h> |
99c97852 | 17 | #include <linux/module.h> |
6790e29f | 18 | |
06458e27 JC |
19 | #include <linux/iio/iio.h> |
20 | #include <linux/iio/sysfs.h> | |
cadb6951 | 21 | |
6790e29f BS |
22 | #include "ad5624r.h" |
23 | ||
df9cd105 MH |
24 | static int ad5624r_spi_write(struct spi_device *spi, |
25 | u8 cmd, u8 addr, u16 val, u8 len) | |
6790e29f | 26 | { |
6790e29f BS |
27 | u32 data; |
28 | u8 msg[3]; | |
29 | ||
30 | /* | |
14f88f1b MH |
31 | * The input shift register is 24 bits wide. The first two bits are |
32 | * don't care bits. The next three are the command bits, C2 to C0, | |
33 | * followed by the 3-bit DAC address, A2 to A0, and then the | |
34 | * 16-, 14-, 12-bit data-word. The data-word comprises the 16-, | |
35 | * 14-, 12-bit input code followed by 0, 2, or 4 don't care bits, | |
36 | * for the AD5664R, AD5644R, and AD5624R, respectively. | |
6790e29f BS |
37 | */ |
38 | data = (0 << 22) | (cmd << 19) | (addr << 16) | (val << (16 - len)); | |
39 | msg[0] = data >> 16; | |
40 | msg[1] = data >> 8; | |
41 | msg[2] = data; | |
42 | ||
df9cd105 | 43 | return spi_write(spi, msg, 3); |
6790e29f BS |
44 | } |
45 | ||
275de9f7 LPC |
46 | static int ad5624r_read_raw(struct iio_dev *indio_dev, |
47 | struct iio_chan_spec const *chan, | |
48 | int *val, | |
49 | int *val2, | |
50 | long m) | |
6790e29f | 51 | { |
3ff24205 | 52 | struct ad5624r_state *st = iio_priv(indio_dev); |
275de9f7 | 53 | unsigned long scale_uv; |
6790e29f | 54 | |
275de9f7 LPC |
55 | switch (m) { |
56 | case IIO_CHAN_INFO_SCALE: | |
57 | scale_uv = (st->vref_mv * 1000) >> chan->scan_type.realbits; | |
58 | *val = scale_uv / 1000; | |
59 | *val2 = (scale_uv % 1000) * 1000; | |
60 | return IIO_VAL_INT_PLUS_MICRO; | |
6790e29f | 61 | |
275de9f7 LPC |
62 | } |
63 | return -EINVAL; | |
64 | } | |
65 | ||
66 | static int ad5624r_write_raw(struct iio_dev *indio_dev, | |
67 | struct iio_chan_spec const *chan, | |
68 | int val, | |
69 | int val2, | |
70 | long mask) | |
71 | { | |
72 | struct ad5624r_state *st = iio_priv(indio_dev); | |
73 | int ret; | |
74 | ||
75 | switch (mask) { | |
09f4eb40 | 76 | case IIO_CHAN_INFO_RAW: |
275de9f7 LPC |
77 | if (val >= (1 << chan->scan_type.realbits) || val < 0) |
78 | return -EINVAL; | |
79 | ||
80 | return ad5624r_spi_write(st->us, | |
81 | AD5624R_CMD_WRITE_INPUT_N_UPDATE_N, | |
82 | chan->address, val, | |
83 | chan->scan_type.shift); | |
84 | default: | |
85 | ret = -EINVAL; | |
86 | } | |
87 | ||
88 | return -EINVAL; | |
6790e29f BS |
89 | } |
90 | ||
66eb9050 LPC |
91 | static const char * const ad5624r_powerdown_modes[] = { |
92 | "1kohm_to_gnd", | |
93 | "100kohm_to_gnd", | |
94 | "three_state" | |
95 | }; | |
96 | ||
97 | static int ad5624r_get_powerdown_mode(struct iio_dev *indio_dev, | |
98 | const struct iio_chan_spec *chan) | |
6790e29f | 99 | { |
3ff24205 | 100 | struct ad5624r_state *st = iio_priv(indio_dev); |
6790e29f | 101 | |
66eb9050 | 102 | return st->pwr_down_mode; |
6790e29f BS |
103 | } |
104 | ||
66eb9050 LPC |
105 | static int ad5624r_set_powerdown_mode(struct iio_dev *indio_dev, |
106 | const struct iio_chan_spec *chan, unsigned int mode) | |
6790e29f | 107 | { |
3ff24205 | 108 | struct ad5624r_state *st = iio_priv(indio_dev); |
6790e29f | 109 | |
66eb9050 | 110 | st->pwr_down_mode = mode; |
6790e29f | 111 | |
66eb9050 | 112 | return 0; |
6790e29f BS |
113 | } |
114 | ||
66eb9050 LPC |
115 | static const struct iio_enum ad5624r_powerdown_mode_enum = { |
116 | .items = ad5624r_powerdown_modes, | |
117 | .num_items = ARRAY_SIZE(ad5624r_powerdown_modes), | |
118 | .get = ad5624r_get_powerdown_mode, | |
119 | .set = ad5624r_set_powerdown_mode, | |
120 | }; | |
121 | ||
122 | static ssize_t ad5624r_read_dac_powerdown(struct iio_dev *indio_dev, | |
123 | uintptr_t private, const struct iio_chan_spec *chan, char *buf) | |
6790e29f | 124 | { |
3ff24205 | 125 | struct ad5624r_state *st = iio_priv(indio_dev); |
6790e29f | 126 | |
14f88f1b | 127 | return sprintf(buf, "%d\n", |
66eb9050 | 128 | !!(st->pwr_down_mask & (1 << chan->channel))); |
6790e29f BS |
129 | } |
130 | ||
66eb9050 LPC |
131 | static ssize_t ad5624r_write_dac_powerdown(struct iio_dev *indio_dev, |
132 | uintptr_t private, const struct iio_chan_spec *chan, const char *buf, | |
133 | size_t len) | |
6790e29f | 134 | { |
2490594e | 135 | bool pwr_down; |
6790e29f | 136 | int ret; |
3ff24205 | 137 | struct ad5624r_state *st = iio_priv(indio_dev); |
6790e29f | 138 | |
2490594e | 139 | ret = strtobool(buf, &pwr_down); |
6790e29f BS |
140 | if (ret) |
141 | return ret; | |
142 | ||
2490594e | 143 | if (pwr_down) |
66eb9050 | 144 | st->pwr_down_mask |= (1 << chan->channel); |
14f88f1b | 145 | else |
2490594e | 146 | st->pwr_down_mask &= ~(1 << chan->channel); |
6790e29f | 147 | |
14f88f1b MH |
148 | ret = ad5624r_spi_write(st->us, AD5624R_CMD_POWERDOWN_DAC, 0, |
149 | (st->pwr_down_mode << 4) | | |
150 | st->pwr_down_mask, 16); | |
6790e29f BS |
151 | |
152 | return ret ? ret : len; | |
153 | } | |
154 | ||
6fe8135f | 155 | static const struct iio_info ad5624r_info = { |
275de9f7 LPC |
156 | .write_raw = ad5624r_write_raw, |
157 | .read_raw = ad5624r_read_raw, | |
6fe8135f JC |
158 | .driver_module = THIS_MODULE, |
159 | }; | |
160 | ||
66eb9050 LPC |
161 | static const struct iio_chan_spec_ext_info ad5624r_ext_info[] = { |
162 | { | |
163 | .name = "powerdown", | |
164 | .read = ad5624r_read_dac_powerdown, | |
165 | .write = ad5624r_write_dac_powerdown, | |
3704432f | 166 | .shared = IIO_SEPARATE, |
66eb9050 | 167 | }, |
3704432f JC |
168 | IIO_ENUM("powerdown_mode", IIO_SHARED_BY_TYPE, |
169 | &ad5624r_powerdown_mode_enum), | |
66eb9050 LPC |
170 | IIO_ENUM_AVAILABLE("powerdown_mode", &ad5624r_powerdown_mode_enum), |
171 | { }, | |
172 | }; | |
173 | ||
174 | #define AD5624R_CHANNEL(_chan, _bits) { \ | |
175 | .type = IIO_VOLTAGE, \ | |
176 | .indexed = 1, \ | |
177 | .output = 1, \ | |
178 | .channel = (_chan), \ | |
8b686348 JC |
179 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ |
180 | .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ | |
66eb9050 LPC |
181 | .address = (_chan), \ |
182 | .scan_type = IIO_ST('u', (_bits), 16, 16 - (_bits)), \ | |
183 | .ext_info = ad5624r_ext_info, \ | |
184 | } | |
185 | ||
186 | #define DECLARE_AD5624R_CHANNELS(_name, _bits) \ | |
187 | const struct iio_chan_spec _name##_channels[] = { \ | |
188 | AD5624R_CHANNEL(0, _bits), \ | |
189 | AD5624R_CHANNEL(1, _bits), \ | |
190 | AD5624R_CHANNEL(2, _bits), \ | |
191 | AD5624R_CHANNEL(3, _bits), \ | |
192 | } | |
193 | ||
194 | static DECLARE_AD5624R_CHANNELS(ad5624r, 12); | |
195 | static DECLARE_AD5624R_CHANNELS(ad5644r, 14); | |
196 | static DECLARE_AD5624R_CHANNELS(ad5664r, 16); | |
197 | ||
198 | static const struct ad5624r_chip_info ad5624r_chip_info_tbl[] = { | |
199 | [ID_AD5624R3] = { | |
200 | .channels = ad5624r_channels, | |
201 | .int_vref_mv = 1250, | |
202 | }, | |
203 | [ID_AD5624R5] = { | |
204 | .channels = ad5624r_channels, | |
205 | .int_vref_mv = 2500, | |
206 | }, | |
207 | [ID_AD5644R3] = { | |
208 | .channels = ad5644r_channels, | |
209 | .int_vref_mv = 1250, | |
210 | }, | |
211 | [ID_AD5644R5] = { | |
212 | .channels = ad5644r_channels, | |
213 | .int_vref_mv = 2500, | |
214 | }, | |
215 | [ID_AD5664R3] = { | |
216 | .channels = ad5664r_channels, | |
217 | .int_vref_mv = 1250, | |
218 | }, | |
219 | [ID_AD5664R5] = { | |
220 | .channels = ad5664r_channels, | |
221 | .int_vref_mv = 2500, | |
222 | }, | |
223 | }; | |
224 | ||
fc52692c | 225 | static int ad5624r_probe(struct spi_device *spi) |
6790e29f | 226 | { |
6790e29f | 227 | struct ad5624r_state *st; |
3ff24205 | 228 | struct iio_dev *indio_dev; |
14f88f1b | 229 | int ret, voltage_uv = 0; |
6790e29f | 230 | |
75238230 SK |
231 | indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st)); |
232 | if (!indio_dev) | |
233 | return -ENOMEM; | |
3ff24205 | 234 | st = iio_priv(indio_dev); |
75238230 | 235 | st->reg = devm_regulator_get(&spi->dev, "vcc"); |
26a54797 JC |
236 | if (!IS_ERR(st->reg)) { |
237 | ret = regulator_enable(st->reg); | |
238 | if (ret) | |
75238230 | 239 | return ret; |
26a54797 | 240 | |
8434e785 AL |
241 | ret = regulator_get_voltage(st->reg); |
242 | if (ret < 0) | |
243 | goto error_disable_reg; | |
244 | ||
245 | voltage_uv = ret; | |
26a54797 JC |
246 | } |
247 | ||
3ff24205 | 248 | spi_set_drvdata(spi, indio_dev); |
14f88f1b MH |
249 | st->chip_info = |
250 | &ad5624r_chip_info_tbl[spi_get_device_id(spi)->driver_data]; | |
251 | ||
252 | if (voltage_uv) | |
253 | st->vref_mv = voltage_uv / 1000; | |
254 | else | |
255 | st->vref_mv = st->chip_info->int_vref_mv; | |
6790e29f BS |
256 | |
257 | st->us = spi; | |
6790e29f | 258 | |
3ff24205 JC |
259 | indio_dev->dev.parent = &spi->dev; |
260 | indio_dev->name = spi_get_device_id(spi)->name; | |
261 | indio_dev->info = &ad5624r_info; | |
262 | indio_dev->modes = INDIO_DIRECT_MODE; | |
275de9f7 LPC |
263 | indio_dev->channels = st->chip_info->channels; |
264 | indio_dev->num_channels = AD5624R_DAC_CHANNELS; | |
3ff24205 | 265 | |
3e394407 JC |
266 | ret = ad5624r_spi_write(spi, AD5624R_CMD_INTERNAL_REFER_SETUP, 0, |
267 | !!voltage_uv, 16); | |
6790e29f | 268 | if (ret) |
26a54797 | 269 | goto error_disable_reg; |
6790e29f | 270 | |
3e394407 | 271 | ret = iio_device_register(indio_dev); |
14f88f1b | 272 | if (ret) |
26a54797 | 273 | goto error_disable_reg; |
6790e29f BS |
274 | |
275 | return 0; | |
276 | ||
14f88f1b | 277 | error_disable_reg: |
26a54797 JC |
278 | if (!IS_ERR(st->reg)) |
279 | regulator_disable(st->reg); | |
14f88f1b | 280 | |
6790e29f BS |
281 | return ret; |
282 | } | |
283 | ||
fc52692c | 284 | static int ad5624r_remove(struct spi_device *spi) |
6790e29f | 285 | { |
3ff24205 JC |
286 | struct iio_dev *indio_dev = spi_get_drvdata(spi); |
287 | struct ad5624r_state *st = iio_priv(indio_dev); | |
3ff24205 | 288 | |
d2fffd6c | 289 | iio_device_unregister(indio_dev); |
75238230 | 290 | if (!IS_ERR(st->reg)) |
26a54797 | 291 | regulator_disable(st->reg); |
14f88f1b | 292 | |
6790e29f BS |
293 | return 0; |
294 | } | |
295 | ||
ece30c15 | 296 | static const struct spi_device_id ad5624r_id[] = { |
14f88f1b MH |
297 | {"ad5624r3", ID_AD5624R3}, |
298 | {"ad5644r3", ID_AD5644R3}, | |
299 | {"ad5664r3", ID_AD5664R3}, | |
300 | {"ad5624r5", ID_AD5624R5}, | |
301 | {"ad5644r5", ID_AD5644R5}, | |
302 | {"ad5664r5", ID_AD5664R5}, | |
ece30c15 MH |
303 | {} |
304 | }; | |
55e4390c | 305 | MODULE_DEVICE_TABLE(spi, ad5624r_id); |
ece30c15 | 306 | |
6790e29f BS |
307 | static struct spi_driver ad5624r_driver = { |
308 | .driver = { | |
24d6050b MH |
309 | .name = "ad5624r", |
310 | .owner = THIS_MODULE, | |
311 | }, | |
6790e29f | 312 | .probe = ad5624r_probe, |
fc52692c | 313 | .remove = ad5624r_remove, |
ece30c15 | 314 | .id_table = ad5624r_id, |
6790e29f | 315 | }; |
ae6ae6fe | 316 | module_spi_driver(ad5624r_driver); |
6790e29f BS |
317 | |
318 | MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>"); | |
319 | MODULE_DESCRIPTION("Analog Devices AD5624/44/64R DAC spi driver"); | |
320 | MODULE_LICENSE("GPL v2"); |