Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 1 | /* |
| 2 | * AD7606 SPI ADC driver |
| 3 | * |
| 4 | * Copyright 2011 Analog Devices Inc. |
| 5 | * |
| 6 | * Licensed under the GPL-2. |
| 7 | */ |
| 8 | |
| 9 | #include <linux/module.h> |
| 10 | #include <linux/spi/spi.h> |
| 11 | #include <linux/types.h> |
| 12 | #include <linux/err.h> |
Michael Hennerich | e61181d | 2011-05-18 14:42:01 +0100 | [diff] [blame] | 13 | |
Jonathan Cameron | 06458e2 | 2012-04-25 15:54:58 +0100 | [diff] [blame] | 14 | #include <linux/iio/iio.h> |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 15 | #include "ad7606.h" |
| 16 | |
| 17 | #define MAX_SPI_FREQ_HZ 23500000 /* VDRIVE above 4.75 V */ |
| 18 | |
| 19 | static int ad7606_spi_read_block(struct device *dev, |
| 20 | int count, void *buf) |
| 21 | { |
| 22 | struct spi_device *spi = to_spi_device(dev); |
| 23 | int i, ret; |
| 24 | unsigned short *data = buf; |
| 25 | |
| 26 | ret = spi_read(spi, (u8 *)buf, count * 2); |
| 27 | if (ret < 0) { |
| 28 | dev_err(&spi->dev, "SPI read error\n"); |
| 29 | return ret; |
| 30 | } |
| 31 | |
| 32 | for (i = 0; i < count; i++) |
| 33 | data[i] = be16_to_cpu(data[i]); |
| 34 | |
| 35 | return 0; |
| 36 | } |
| 37 | |
| 38 | static const struct ad7606_bus_ops ad7606_spi_bops = { |
| 39 | .read_block = ad7606_spi_read_block, |
| 40 | }; |
| 41 | |
Bill Pemberton | 4ae1c61 | 2012-11-19 13:21:57 -0500 | [diff] [blame] | 42 | static int ad7606_spi_probe(struct spi_device *spi) |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 43 | { |
Michael Hennerich | e61181d | 2011-05-18 14:42:01 +0100 | [diff] [blame] | 44 | struct iio_dev *indio_dev; |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 45 | |
Michael Hennerich | e61181d | 2011-05-18 14:42:01 +0100 | [diff] [blame] | 46 | indio_dev = ad7606_probe(&spi->dev, spi->irq, NULL, |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 47 | spi_get_device_id(spi)->driver_data, |
| 48 | &ad7606_spi_bops); |
| 49 | |
Michael Hennerich | e61181d | 2011-05-18 14:42:01 +0100 | [diff] [blame] | 50 | if (IS_ERR(indio_dev)) |
| 51 | return PTR_ERR(indio_dev); |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 52 | |
Michael Hennerich | e61181d | 2011-05-18 14:42:01 +0100 | [diff] [blame] | 53 | spi_set_drvdata(spi, indio_dev); |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 54 | |
| 55 | return 0; |
| 56 | } |
| 57 | |
Bill Pemberton | 447d4f2 | 2012-11-19 13:26:37 -0500 | [diff] [blame] | 58 | static int ad7606_spi_remove(struct spi_device *spi) |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 59 | { |
Michael Hennerich | e61181d | 2011-05-18 14:42:01 +0100 | [diff] [blame] | 60 | struct iio_dev *indio_dev = dev_get_drvdata(&spi->dev); |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 61 | |
Jonathan Cameron | 8cbb36a | 2011-09-30 10:05:42 +0100 | [diff] [blame] | 62 | return ad7606_remove(indio_dev, spi->irq); |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 63 | } |
| 64 | |
| 65 | #ifdef CONFIG_PM |
| 66 | static int ad7606_spi_suspend(struct device *dev) |
| 67 | { |
Michael Hennerich | e61181d | 2011-05-18 14:42:01 +0100 | [diff] [blame] | 68 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 69 | |
Michael Hennerich | e61181d | 2011-05-18 14:42:01 +0100 | [diff] [blame] | 70 | ad7606_suspend(indio_dev); |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 71 | |
| 72 | return 0; |
| 73 | } |
| 74 | |
| 75 | static int ad7606_spi_resume(struct device *dev) |
| 76 | { |
Michael Hennerich | e61181d | 2011-05-18 14:42:01 +0100 | [diff] [blame] | 77 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 78 | |
Michael Hennerich | e61181d | 2011-05-18 14:42:01 +0100 | [diff] [blame] | 79 | ad7606_resume(indio_dev); |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 80 | |
| 81 | return 0; |
| 82 | } |
| 83 | |
| 84 | static const struct dev_pm_ops ad7606_pm_ops = { |
| 85 | .suspend = ad7606_spi_suspend, |
| 86 | .resume = ad7606_spi_resume, |
| 87 | }; |
| 88 | #define AD7606_SPI_PM_OPS (&ad7606_pm_ops) |
| 89 | |
| 90 | #else |
| 91 | #define AD7606_SPI_PM_OPS NULL |
| 92 | #endif |
| 93 | |
| 94 | static const struct spi_device_id ad7606_id[] = { |
| 95 | {"ad7606-8", ID_AD7606_8}, |
| 96 | {"ad7606-6", ID_AD7606_6}, |
| 97 | {"ad7606-4", ID_AD7606_4}, |
| 98 | {} |
| 99 | }; |
Lars-Peter Clausen | 55e4390 | 2011-11-16 08:53:31 +0100 | [diff] [blame] | 100 | MODULE_DEVICE_TABLE(spi, ad7606_id); |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 101 | |
| 102 | static struct spi_driver ad7606_driver = { |
| 103 | .driver = { |
| 104 | .name = "ad7606", |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 105 | .owner = THIS_MODULE, |
| 106 | .pm = AD7606_SPI_PM_OPS, |
| 107 | }, |
| 108 | .probe = ad7606_spi_probe, |
Bill Pemberton | e543acf | 2012-11-19 13:21:38 -0500 | [diff] [blame] | 109 | .remove = ad7606_spi_remove, |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 110 | .id_table = ad7606_id, |
| 111 | }; |
Lars-Peter Clausen | ae6ae6f | 2011-11-16 10:13:39 +0100 | [diff] [blame] | 112 | module_spi_driver(ad7606_driver); |
Michael Hennerich | b9618c0 | 2011-02-22 21:46:18 +0100 | [diff] [blame] | 113 | |
| 114 | MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); |
| 115 | MODULE_DESCRIPTION("Analog Devices AD7606 ADC"); |
| 116 | MODULE_LICENSE("GPL v2"); |