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349282d8 MH |
1 | /* |
2 | * AD7466/7/8 AD7476/5/7/8 (A) SPI ADC driver | |
3 | * | |
4 | * Copyright 2010 Analog Devices Inc. | |
5 | * | |
6 | * Licensed under the GPL-2 or later. | |
7 | */ | |
8 | ||
349282d8 MH |
9 | #include <linux/device.h> |
10 | #include <linux/kernel.h> | |
11 | #include <linux/slab.h> | |
12 | #include <linux/sysfs.h> | |
349282d8 MH |
13 | #include <linux/spi/spi.h> |
14 | #include <linux/regulator/consumer.h> | |
15 | #include <linux/err.h> | |
99c97852 | 16 | #include <linux/module.h> |
349282d8 MH |
17 | |
18 | #include "../iio.h" | |
19 | #include "../sysfs.h" | |
3811cd62 | 20 | #include "../buffer_generic.h" |
349282d8 MH |
21 | |
22 | #include "ad7476.h" | |
23 | ||
24 | static int ad7476_scan_direct(struct ad7476_state *st) | |
25 | { | |
349282d8 MH |
26 | int ret; |
27 | ||
668413e9 | 28 | ret = spi_sync(st->spi, &st->msg); |
349282d8 MH |
29 | if (ret) |
30 | return ret; | |
31 | ||
32 | return (st->data[0] << 8) | st->data[1]; | |
33 | } | |
34 | ||
84f79ecb | 35 | static int ad7476_read_raw(struct iio_dev *indio_dev, |
c5e0819e JC |
36 | struct iio_chan_spec const *chan, |
37 | int *val, | |
38 | int *val2, | |
39 | long m) | |
349282d8 | 40 | { |
349282d8 | 41 | int ret; |
84f79ecb | 42 | struct ad7476_state *st = iio_priv(indio_dev); |
c5e0819e JC |
43 | unsigned int scale_uv; |
44 | ||
45 | switch (m) { | |
46 | case 0: | |
84f79ecb JC |
47 | mutex_lock(&indio_dev->mlock); |
48 | if (iio_buffer_enabled(indio_dev)) | |
49 | ret = ad7476_scan_from_ring(indio_dev); | |
c5e0819e JC |
50 | else |
51 | ret = ad7476_scan_direct(st); | |
84f79ecb | 52 | mutex_unlock(&indio_dev->mlock); |
c5e0819e JC |
53 | |
54 | if (ret < 0) | |
55 | return ret; | |
56 | *val = (ret >> st->chip_info->channel[0].scan_type.shift) & | |
57 | RES_MASK(st->chip_info->channel[0].scan_type.realbits); | |
58 | return IIO_VAL_INT; | |
59 | case (1 << IIO_CHAN_INFO_SCALE_SHARED): | |
60 | scale_uv = (st->int_vref_mv * 1000) | |
61 | >> st->chip_info->channel[0].scan_type.realbits; | |
62 | *val = scale_uv/1000; | |
63 | *val2 = (scale_uv%1000)*1000; | |
64 | return IIO_VAL_INT_PLUS_MICRO; | |
65 | } | |
66 | return -EINVAL; | |
349282d8 | 67 | } |
349282d8 | 68 | |
349282d8 MH |
69 | static const struct ad7476_chip_info ad7476_chip_info_tbl[] = { |
70 | [ID_AD7466] = { | |
6835cb6b | 71 | .channel[0] = IIO_CHAN(IIO_VOLTAGE, 0, 1, 0, NULL, 0, 0, |
c5e0819e JC |
72 | (1 << IIO_CHAN_INFO_SCALE_SHARED), |
73 | 0, 0, IIO_ST('u', 12, 16, 0), 0), | |
74 | .channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1), | |
349282d8 MH |
75 | }, |
76 | [ID_AD7467] = { | |
6835cb6b | 77 | .channel[0] = IIO_CHAN(IIO_VOLTAGE, 0, 1, 0, NULL, 0, 0, |
c5e0819e JC |
78 | (1 << IIO_CHAN_INFO_SCALE_SHARED), |
79 | 0, 0, IIO_ST('u', 10, 16, 2), 0), | |
80 | .channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1), | |
349282d8 MH |
81 | }, |
82 | [ID_AD7468] = { | |
6835cb6b | 83 | .channel[0] = IIO_CHAN(IIO_VOLTAGE, 0, 1 , 0, NULL, 0, 0, |
c5e0819e JC |
84 | (1 << IIO_CHAN_INFO_SCALE_SHARED), |
85 | 0, 0, IIO_ST('u', 8, 16, 4), 0), | |
86 | .channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1), | |
349282d8 MH |
87 | }, |
88 | [ID_AD7475] = { | |
6835cb6b | 89 | .channel[0] = IIO_CHAN(IIO_VOLTAGE, 0, 1, 0, NULL, 0, 0, |
c5e0819e JC |
90 | (1 << IIO_CHAN_INFO_SCALE_SHARED), |
91 | 0, 0, IIO_ST('u', 12, 16, 0), 0), | |
92 | .channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1), | |
349282d8 MH |
93 | }, |
94 | [ID_AD7476] = { | |
6835cb6b | 95 | .channel[0] = IIO_CHAN(IIO_VOLTAGE, 0, 1, 0, NULL, 0, 0, |
c5e0819e JC |
96 | (1 << IIO_CHAN_INFO_SCALE_SHARED), |
97 | 0, 0, IIO_ST('u', 12, 16, 0), 0), | |
98 | .channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1), | |
349282d8 MH |
99 | }, |
100 | [ID_AD7477] = { | |
6835cb6b | 101 | .channel[0] = IIO_CHAN(IIO_VOLTAGE, 0, 1, 0, NULL, 0, 0, |
c5e0819e JC |
102 | (1 << IIO_CHAN_INFO_SCALE_SHARED), |
103 | 0, 0, IIO_ST('u', 10, 16, 2), 0), | |
104 | .channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1), | |
349282d8 MH |
105 | }, |
106 | [ID_AD7478] = { | |
6835cb6b | 107 | .channel[0] = IIO_CHAN(IIO_VOLTAGE, 0, 1, 0, NULL, 0, 0, |
c5e0819e JC |
108 | (1 << IIO_CHAN_INFO_SCALE_SHARED), |
109 | 0, 0, IIO_ST('u', 8, 16, 4), 0), | |
110 | .channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1), | |
349282d8 MH |
111 | }, |
112 | [ID_AD7495] = { | |
6835cb6b | 113 | .channel[0] = IIO_CHAN(IIO_VOLTAGE, 0, 1, 0, NULL, 0, 0, |
c5e0819e JC |
114 | (1 << IIO_CHAN_INFO_SCALE_SHARED), |
115 | 0, 0, IIO_ST('u', 12, 16, 0), 0), | |
116 | .channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1), | |
349282d8 | 117 | .int_vref_mv = 2500, |
349282d8 MH |
118 | }, |
119 | }; | |
120 | ||
6fe8135f JC |
121 | static const struct iio_info ad7476_info = { |
122 | .driver_module = THIS_MODULE, | |
123 | .read_raw = &ad7476_read_raw, | |
124 | }; | |
125 | ||
349282d8 MH |
126 | static int __devinit ad7476_probe(struct spi_device *spi) |
127 | { | |
128 | struct ad7476_platform_data *pdata = spi->dev.platform_data; | |
129 | struct ad7476_state *st; | |
67688105 | 130 | struct iio_dev *indio_dev; |
349282d8 MH |
131 | int ret, voltage_uv = 0; |
132 | ||
67688105 JC |
133 | indio_dev = iio_allocate_device(sizeof(*st)); |
134 | if (indio_dev == NULL) { | |
349282d8 MH |
135 | ret = -ENOMEM; |
136 | goto error_ret; | |
137 | } | |
67688105 | 138 | st = iio_priv(indio_dev); |
26a54797 JC |
139 | st->reg = regulator_get(&spi->dev, "vcc"); |
140 | if (!IS_ERR(st->reg)) { | |
141 | ret = regulator_enable(st->reg); | |
349282d8 MH |
142 | if (ret) |
143 | goto error_put_reg; | |
144 | ||
26a54797 | 145 | voltage_uv = regulator_get_voltage(st->reg); |
349282d8 | 146 | } |
349282d8 MH |
147 | st->chip_info = |
148 | &ad7476_chip_info_tbl[spi_get_device_id(spi)->driver_data]; | |
149 | ||
150 | if (st->chip_info->int_vref_mv) | |
151 | st->int_vref_mv = st->chip_info->int_vref_mv; | |
152 | else if (pdata && pdata->vref_mv) | |
153 | st->int_vref_mv = pdata->vref_mv; | |
154 | else if (voltage_uv) | |
155 | st->int_vref_mv = voltage_uv / 1000; | |
156 | else | |
157 | dev_warn(&spi->dev, "reference voltage unspecified\n"); | |
158 | ||
38f71aa9 | 159 | spi_set_drvdata(spi, indio_dev); |
349282d8 | 160 | |
349282d8 MH |
161 | st->spi = spi; |
162 | ||
ae639830 | 163 | /* Establish that the iio_dev is a child of the spi device */ |
67688105 JC |
164 | indio_dev->dev.parent = &spi->dev; |
165 | indio_dev->name = spi_get_device_id(spi)->name; | |
166 | indio_dev->modes = INDIO_DIRECT_MODE; | |
167 | indio_dev->channels = st->chip_info->channel; | |
168 | indio_dev->num_channels = 2; | |
169 | indio_dev->info = &ad7476_info; | |
349282d8 MH |
170 | /* Setup default message */ |
171 | ||
172 | st->xfer.rx_buf = &st->data; | |
c5e0819e | 173 | st->xfer.len = st->chip_info->channel[0].scan_type.storagebits / 8; |
349282d8 MH |
174 | |
175 | spi_message_init(&st->msg); | |
176 | spi_message_add_tail(&st->xfer, &st->msg); | |
177 | ||
67688105 | 178 | ret = ad7476_register_ring_funcs_and_init(indio_dev); |
349282d8 | 179 | if (ret) |
67688105 | 180 | goto error_disable_reg; |
349282d8 | 181 | |
14555b14 JC |
182 | ret = iio_buffer_register(indio_dev, |
183 | st->chip_info->channel, | |
184 | ARRAY_SIZE(st->chip_info->channel)); | |
349282d8 MH |
185 | if (ret) |
186 | goto error_cleanup_ring; | |
26d25ae3 JC |
187 | |
188 | ret = iio_device_register(indio_dev); | |
189 | if (ret) | |
190 | goto error_ring_unregister; | |
349282d8 MH |
191 | return 0; |
192 | ||
26d25ae3 | 193 | error_ring_unregister: |
14555b14 | 194 | iio_buffer_unregister(indio_dev); |
349282d8 | 195 | error_cleanup_ring: |
67688105 | 196 | ad7476_ring_cleanup(indio_dev); |
349282d8 | 197 | error_disable_reg: |
26a54797 | 198 | if (!IS_ERR(st->reg)) |
349282d8 MH |
199 | regulator_disable(st->reg); |
200 | error_put_reg: | |
26a54797 JC |
201 | if (!IS_ERR(st->reg)) |
202 | regulator_put(st->reg); | |
26d25ae3 JC |
203 | iio_free_device(indio_dev); |
204 | ||
349282d8 MH |
205 | error_ret: |
206 | return ret; | |
207 | } | |
208 | ||
209 | static int ad7476_remove(struct spi_device *spi) | |
210 | { | |
67688105 JC |
211 | struct iio_dev *indio_dev = spi_get_drvdata(spi); |
212 | struct ad7476_state *st = iio_priv(indio_dev); | |
67688105 | 213 | |
d2fffd6c | 214 | iio_device_unregister(indio_dev); |
14555b14 | 215 | iio_buffer_unregister(indio_dev); |
349282d8 | 216 | ad7476_ring_cleanup(indio_dev); |
26a54797 JC |
217 | if (!IS_ERR(st->reg)) { |
218 | regulator_disable(st->reg); | |
219 | regulator_put(st->reg); | |
349282d8 | 220 | } |
d2fffd6c | 221 | iio_free_device(indio_dev); |
67688105 | 222 | |
349282d8 MH |
223 | return 0; |
224 | } | |
225 | ||
226 | static const struct spi_device_id ad7476_id[] = { | |
227 | {"ad7466", ID_AD7466}, | |
228 | {"ad7467", ID_AD7467}, | |
229 | {"ad7468", ID_AD7468}, | |
230 | {"ad7475", ID_AD7475}, | |
231 | {"ad7476", ID_AD7476}, | |
232 | {"ad7476a", ID_AD7476}, | |
233 | {"ad7477", ID_AD7477}, | |
234 | {"ad7477a", ID_AD7477}, | |
235 | {"ad7478", ID_AD7478}, | |
236 | {"ad7478a", ID_AD7478}, | |
237 | {"ad7495", ID_AD7495}, | |
238 | {} | |
239 | }; | |
240 | ||
241 | static struct spi_driver ad7476_driver = { | |
242 | .driver = { | |
243 | .name = "ad7476", | |
244 | .bus = &spi_bus_type, | |
245 | .owner = THIS_MODULE, | |
246 | }, | |
247 | .probe = ad7476_probe, | |
248 | .remove = __devexit_p(ad7476_remove), | |
249 | .id_table = ad7476_id, | |
250 | }; | |
ae6ae6fe | 251 | module_spi_driver(ad7476_driver); |
349282d8 MH |
252 | |
253 | MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); | |
254 | MODULE_DESCRIPTION("Analog Devices AD7475/6/7/8(A) AD7466/7/8 ADC"); | |
255 | MODULE_LICENSE("GPL v2"); | |
256 | MODULE_ALIAS("spi:ad7476"); |