Commit | Line | Data |
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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 | 17 | |
06458e27 JC |
18 | #include <linux/iio/iio.h> |
19 | #include <linux/iio/sysfs.h> | |
20 | #include <linux/iio/buffer.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) { | |
b11f98ff | 46 | case IIO_CHAN_INFO_RAW: |
84f79ecb JC |
47 | mutex_lock(&indio_dev->mlock); |
48 | if (iio_buffer_enabled(indio_dev)) | |
78c32ed3 | 49 | ret = -EBUSY; |
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; | |
c8a9f805 | 59 | case IIO_CHAN_INFO_SCALE: |
c5e0819e JC |
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 | |
85871cd8 JC |
69 | #define AD7476_CHAN(bits) \ |
70 | { \ | |
71 | .type = IIO_VOLTAGE, \ | |
72 | .indexed = 1, \ | |
b11f98ff JC |
73 | .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT | \ |
74 | IIO_CHAN_INFO_SCALE_SHARED_BIT, \ | |
85871cd8 JC |
75 | .scan_type = { \ |
76 | .sign = 'u', \ | |
77 | .realbits = bits, \ | |
78 | .storagebits = 16, \ | |
79 | .shift = 12 - bits, \ | |
80 | }, \ | |
81 | } | |
82 | ||
349282d8 MH |
83 | static const struct ad7476_chip_info ad7476_chip_info_tbl[] = { |
84 | [ID_AD7466] = { | |
85871cd8 | 85 | .channel[0] = AD7476_CHAN(12), |
c5e0819e | 86 | .channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1), |
349282d8 MH |
87 | }, |
88 | [ID_AD7467] = { | |
85871cd8 | 89 | .channel[0] = AD7476_CHAN(10), |
c5e0819e | 90 | .channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1), |
349282d8 MH |
91 | }, |
92 | [ID_AD7468] = { | |
85871cd8 | 93 | .channel[0] = AD7476_CHAN(8), |
c5e0819e | 94 | .channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1), |
349282d8 MH |
95 | }, |
96 | [ID_AD7475] = { | |
85871cd8 | 97 | .channel[0] = AD7476_CHAN(12), |
c5e0819e | 98 | .channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1), |
349282d8 MH |
99 | }, |
100 | [ID_AD7476] = { | |
85871cd8 | 101 | .channel[0] = AD7476_CHAN(12), |
c5e0819e | 102 | .channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1), |
349282d8 MH |
103 | }, |
104 | [ID_AD7477] = { | |
85871cd8 | 105 | .channel[0] = AD7476_CHAN(10), |
c5e0819e | 106 | .channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1), |
349282d8 MH |
107 | }, |
108 | [ID_AD7478] = { | |
85871cd8 | 109 | .channel[0] = AD7476_CHAN(8), |
c5e0819e | 110 | .channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1), |
349282d8 MH |
111 | }, |
112 | [ID_AD7495] = { | |
85871cd8 | 113 | .channel[0] = AD7476_CHAN(12), |
c5e0819e | 114 | .channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1), |
349282d8 | 115 | .int_vref_mv = 2500, |
349282d8 MH |
116 | }, |
117 | }; | |
118 | ||
6fe8135f JC |
119 | static const struct iio_info ad7476_info = { |
120 | .driver_module = THIS_MODULE, | |
121 | .read_raw = &ad7476_read_raw, | |
122 | }; | |
123 | ||
349282d8 MH |
124 | static int __devinit ad7476_probe(struct spi_device *spi) |
125 | { | |
126 | struct ad7476_platform_data *pdata = spi->dev.platform_data; | |
127 | struct ad7476_state *st; | |
67688105 | 128 | struct iio_dev *indio_dev; |
349282d8 MH |
129 | int ret, voltage_uv = 0; |
130 | ||
67688105 JC |
131 | indio_dev = iio_allocate_device(sizeof(*st)); |
132 | if (indio_dev == NULL) { | |
349282d8 MH |
133 | ret = -ENOMEM; |
134 | goto error_ret; | |
135 | } | |
67688105 | 136 | st = iio_priv(indio_dev); |
26a54797 JC |
137 | st->reg = regulator_get(&spi->dev, "vcc"); |
138 | if (!IS_ERR(st->reg)) { | |
139 | ret = regulator_enable(st->reg); | |
349282d8 MH |
140 | if (ret) |
141 | goto error_put_reg; | |
142 | ||
26a54797 | 143 | voltage_uv = regulator_get_voltage(st->reg); |
349282d8 | 144 | } |
349282d8 MH |
145 | st->chip_info = |
146 | &ad7476_chip_info_tbl[spi_get_device_id(spi)->driver_data]; | |
147 | ||
148 | if (st->chip_info->int_vref_mv) | |
149 | st->int_vref_mv = st->chip_info->int_vref_mv; | |
150 | else if (pdata && pdata->vref_mv) | |
151 | st->int_vref_mv = pdata->vref_mv; | |
152 | else if (voltage_uv) | |
153 | st->int_vref_mv = voltage_uv / 1000; | |
154 | else | |
155 | dev_warn(&spi->dev, "reference voltage unspecified\n"); | |
156 | ||
38f71aa9 | 157 | spi_set_drvdata(spi, indio_dev); |
349282d8 | 158 | |
349282d8 MH |
159 | st->spi = spi; |
160 | ||
ae639830 | 161 | /* Establish that the iio_dev is a child of the spi device */ |
67688105 JC |
162 | indio_dev->dev.parent = &spi->dev; |
163 | indio_dev->name = spi_get_device_id(spi)->name; | |
164 | indio_dev->modes = INDIO_DIRECT_MODE; | |
165 | indio_dev->channels = st->chip_info->channel; | |
166 | indio_dev->num_channels = 2; | |
167 | indio_dev->info = &ad7476_info; | |
349282d8 MH |
168 | /* Setup default message */ |
169 | ||
170 | st->xfer.rx_buf = &st->data; | |
c5e0819e | 171 | st->xfer.len = st->chip_info->channel[0].scan_type.storagebits / 8; |
349282d8 MH |
172 | |
173 | spi_message_init(&st->msg); | |
174 | spi_message_add_tail(&st->xfer, &st->msg); | |
175 | ||
67688105 | 176 | ret = ad7476_register_ring_funcs_and_init(indio_dev); |
349282d8 | 177 | if (ret) |
67688105 | 178 | goto error_disable_reg; |
349282d8 | 179 | |
14555b14 JC |
180 | ret = iio_buffer_register(indio_dev, |
181 | st->chip_info->channel, | |
182 | ARRAY_SIZE(st->chip_info->channel)); | |
349282d8 MH |
183 | if (ret) |
184 | goto error_cleanup_ring; | |
26d25ae3 JC |
185 | |
186 | ret = iio_device_register(indio_dev); | |
187 | if (ret) | |
188 | goto error_ring_unregister; | |
349282d8 MH |
189 | return 0; |
190 | ||
26d25ae3 | 191 | error_ring_unregister: |
14555b14 | 192 | iio_buffer_unregister(indio_dev); |
349282d8 | 193 | error_cleanup_ring: |
67688105 | 194 | ad7476_ring_cleanup(indio_dev); |
349282d8 | 195 | error_disable_reg: |
26a54797 | 196 | if (!IS_ERR(st->reg)) |
349282d8 MH |
197 | regulator_disable(st->reg); |
198 | error_put_reg: | |
26a54797 JC |
199 | if (!IS_ERR(st->reg)) |
200 | regulator_put(st->reg); | |
26d25ae3 JC |
201 | iio_free_device(indio_dev); |
202 | ||
349282d8 MH |
203 | error_ret: |
204 | return ret; | |
205 | } | |
206 | ||
207 | static int ad7476_remove(struct spi_device *spi) | |
208 | { | |
67688105 JC |
209 | struct iio_dev *indio_dev = spi_get_drvdata(spi); |
210 | struct ad7476_state *st = iio_priv(indio_dev); | |
67688105 | 211 | |
d2fffd6c | 212 | iio_device_unregister(indio_dev); |
14555b14 | 213 | iio_buffer_unregister(indio_dev); |
349282d8 | 214 | ad7476_ring_cleanup(indio_dev); |
26a54797 JC |
215 | if (!IS_ERR(st->reg)) { |
216 | regulator_disable(st->reg); | |
217 | regulator_put(st->reg); | |
349282d8 | 218 | } |
d2fffd6c | 219 | iio_free_device(indio_dev); |
67688105 | 220 | |
349282d8 MH |
221 | return 0; |
222 | } | |
223 | ||
224 | static const struct spi_device_id ad7476_id[] = { | |
225 | {"ad7466", ID_AD7466}, | |
226 | {"ad7467", ID_AD7467}, | |
227 | {"ad7468", ID_AD7468}, | |
228 | {"ad7475", ID_AD7475}, | |
229 | {"ad7476", ID_AD7476}, | |
230 | {"ad7476a", ID_AD7476}, | |
231 | {"ad7477", ID_AD7477}, | |
232 | {"ad7477a", ID_AD7477}, | |
233 | {"ad7478", ID_AD7478}, | |
234 | {"ad7478a", ID_AD7478}, | |
235 | {"ad7495", ID_AD7495}, | |
236 | {} | |
237 | }; | |
55e4390c | 238 | MODULE_DEVICE_TABLE(spi, ad7476_id); |
349282d8 MH |
239 | |
240 | static struct spi_driver ad7476_driver = { | |
241 | .driver = { | |
242 | .name = "ad7476", | |
349282d8 MH |
243 | .owner = THIS_MODULE, |
244 | }, | |
245 | .probe = ad7476_probe, | |
246 | .remove = __devexit_p(ad7476_remove), | |
247 | .id_table = ad7476_id, | |
248 | }; | |
ae6ae6fe | 249 | module_spi_driver(ad7476_driver); |
349282d8 MH |
250 | |
251 | MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); | |
252 | MODULE_DESCRIPTION("Analog Devices AD7475/6/7/8(A) AD7466/7/8 ADC"); | |
253 | MODULE_LICENSE("GPL v2"); |