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c0644160 TD |
1 | /* |
2 | * MS5611 pressure and temperature sensor driver (SPI bus) | |
3 | * | |
4 | * Copyright (c) Tomasz Duszynski <tduszyns@gmail.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | */ | |
11 | ||
12 | #include <linux/delay.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/spi/spi.h> | |
7a948c5e | 15 | #include <linux/of_device.h> |
c0644160 TD |
16 | |
17 | #include "ms5611.h" | |
18 | ||
19 | static int ms5611_spi_reset(struct device *dev) | |
20 | { | |
21 | u8 cmd = MS5611_RESET; | |
22 | struct ms5611_state *st = iio_priv(dev_to_iio_dev(dev)); | |
23 | ||
24 | return spi_write_then_read(st->client, &cmd, 1, NULL, 0); | |
25 | } | |
26 | ||
27 | static int ms5611_spi_read_prom_word(struct device *dev, int index, u16 *word) | |
28 | { | |
29 | int ret; | |
30 | struct ms5611_state *st = iio_priv(dev_to_iio_dev(dev)); | |
31 | ||
32 | ret = spi_w8r16be(st->client, MS5611_READ_PROM_WORD + (index << 1)); | |
33 | if (ret < 0) | |
34 | return ret; | |
35 | ||
36 | *word = ret; | |
37 | ||
38 | return 0; | |
39 | } | |
40 | ||
41 | static int ms5611_spi_read_adc(struct device *dev, s32 *val) | |
42 | { | |
43 | int ret; | |
44 | u8 buf[3] = { MS5611_READ_ADC }; | |
45 | struct ms5611_state *st = iio_priv(dev_to_iio_dev(dev)); | |
46 | ||
47 | ret = spi_write_then_read(st->client, buf, 1, buf, 3); | |
48 | if (ret < 0) | |
49 | return ret; | |
50 | ||
51 | *val = (buf[0] << 16) | (buf[1] << 8) | buf[2]; | |
52 | ||
53 | return 0; | |
54 | } | |
55 | ||
56 | static int ms5611_spi_read_adc_temp_and_pressure(struct device *dev, | |
57 | s32 *temp, s32 *pressure) | |
58 | { | |
c0644160 TD |
59 | int ret; |
60 | struct ms5611_state *st = iio_priv(dev_to_iio_dev(dev)); | |
033691a9 | 61 | const struct ms5611_osr *osr = st->temp_osr; |
c0644160 | 62 | |
033691a9 GB |
63 | /* |
64 | * Warning: &osr->cmd MUST be aligned on a word boundary since used as | |
65 | * 2nd argument (void*) of spi_write_then_read. | |
66 | */ | |
67 | ret = spi_write_then_read(st->client, &osr->cmd, 1, NULL, 0); | |
c0644160 TD |
68 | if (ret < 0) |
69 | return ret; | |
70 | ||
033691a9 | 71 | usleep_range(osr->conv_usec, osr->conv_usec + (osr->conv_usec / 10UL)); |
c0644160 TD |
72 | ret = ms5611_spi_read_adc(dev, temp); |
73 | if (ret < 0) | |
74 | return ret; | |
75 | ||
033691a9 GB |
76 | osr = st->pressure_osr; |
77 | ret = spi_write_then_read(st->client, &osr->cmd, 1, NULL, 0); | |
c0644160 TD |
78 | if (ret < 0) |
79 | return ret; | |
80 | ||
033691a9 | 81 | usleep_range(osr->conv_usec, osr->conv_usec + (osr->conv_usec / 10UL)); |
c0644160 TD |
82 | return ms5611_spi_read_adc(dev, pressure); |
83 | } | |
84 | ||
85 | static int ms5611_spi_probe(struct spi_device *spi) | |
86 | { | |
87 | int ret; | |
88 | struct ms5611_state *st; | |
89 | struct iio_dev *indio_dev; | |
90 | ||
91 | indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st)); | |
92 | if (!indio_dev) | |
93 | return -ENOMEM; | |
94 | ||
713bbb4e DB |
95 | spi_set_drvdata(spi, indio_dev); |
96 | ||
c0644160 TD |
97 | spi->mode = SPI_MODE_0; |
98 | spi->max_speed_hz = 20000000; | |
99 | spi->bits_per_word = 8; | |
100 | ret = spi_setup(spi); | |
101 | if (ret < 0) | |
102 | return ret; | |
103 | ||
104 | st = iio_priv(indio_dev); | |
105 | st->reset = ms5611_spi_reset; | |
106 | st->read_prom_word = ms5611_spi_read_prom_word; | |
107 | st->read_adc_temp_and_pressure = ms5611_spi_read_adc_temp_and_pressure; | |
108 | st->client = spi; | |
109 | ||
eac635eb | 110 | return ms5611_probe(indio_dev, &spi->dev, spi_get_device_id(spi)->name, |
964d97bd | 111 | spi_get_device_id(spi)->driver_data); |
c0644160 TD |
112 | } |
113 | ||
713bbb4e DB |
114 | static int ms5611_spi_remove(struct spi_device *spi) |
115 | { | |
116 | return ms5611_remove(spi_get_drvdata(spi)); | |
117 | } | |
118 | ||
7a948c5e GB |
119 | #if defined(CONFIG_OF) |
120 | static const struct of_device_id ms5611_spi_matches[] = { | |
121 | { .compatible = "meas,ms5611" }, | |
122 | { .compatible = "ms5611" }, | |
123 | { .compatible = "meas,ms5607" }, | |
124 | { .compatible = "ms5607" }, | |
125 | { } | |
126 | }; | |
127 | MODULE_DEVICE_TABLE(of, ms5611_spi_matches); | |
128 | #endif | |
129 | ||
c0644160 | 130 | static const struct spi_device_id ms5611_id[] = { |
9690d81a TD |
131 | { "ms5611", MS5611 }, |
132 | { "ms5607", MS5607 }, | |
c0644160 TD |
133 | { } |
134 | }; | |
135 | MODULE_DEVICE_TABLE(spi, ms5611_id); | |
136 | ||
137 | static struct spi_driver ms5611_driver = { | |
138 | .driver = { | |
139 | .name = "ms5611", | |
7a948c5e | 140 | .of_match_table = of_match_ptr(ms5611_spi_matches) |
c0644160 TD |
141 | }, |
142 | .id_table = ms5611_id, | |
143 | .probe = ms5611_spi_probe, | |
713bbb4e | 144 | .remove = ms5611_spi_remove, |
c0644160 TD |
145 | }; |
146 | module_spi_driver(ms5611_driver); | |
147 | ||
148 | MODULE_AUTHOR("Tomasz Duszynski <tduszyns@gmail.com>"); | |
149 | MODULE_DESCRIPTION("MS5611 spi driver"); | |
150 | MODULE_LICENSE("GPL v2"); |