/drivers/staging/iio/dds/ad9951.c
C | 241 lines | 181 code | 49 blank | 11 comment | 9 complexity | 9983eb70a7cb395d5b3af5449b3e8c55 MD5 | raw file
Possible License(s): LGPL-2.0, AGPL-1.0, GPL-2.0
1/* 2 * Driver for ADI Direct Digital Synthesis ad9951 3 * 4 * Copyright (c) 2010 Analog Devices Inc. 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#include <linux/types.h> 12#include <linux/mutex.h> 13#include <linux/device.h> 14#include <linux/spi/spi.h> 15#include <linux/slab.h> 16#include <linux/sysfs.h> 17 18#include "../iio.h" 19#include "../sysfs.h" 20 21#define DRV_NAME "ad9951" 22 23#define CFR1 0x0 24#define CFR2 0x1 25 26#define AUTO_OSK (1) 27#define OSKEN (1 << 1) 28#define LOAD_ARR (1 << 2) 29 30#define AUTO_SYNC (1 << 7) 31 32#define LSB_FST (1) 33#define SDIO_IPT (1 << 1) 34#define CLR_PHA (1 << 2) 35#define SINE_OPT (1 << 4) 36#define ACLR_PHA (1 << 5) 37 38#define VCO_RANGE (1 << 2) 39 40#define CRS_OPT (1 << 1) 41#define HMANU_SYNC (1 << 2) 42#define HSPD_SYNC (1 << 3) 43 44/* Register format: 1 byte addr + value */ 45struct ad9951_config { 46 u8 asf[3]; 47 u8 arr[2]; 48 u8 ftw0[5]; 49 u8 ftw1[3]; 50}; 51 52struct ad9951_state { 53 struct mutex lock; 54 struct spi_device *sdev; 55}; 56 57static ssize_t ad9951_set_parameter(struct device *dev, 58 struct device_attribute *attr, 59 const char *buf, 60 size_t len) 61{ 62 struct spi_message msg; 63 struct spi_transfer xfer; 64 int ret; 65 struct ad9951_config *config = (struct ad9951_config *)buf; 66 struct iio_dev *idev = dev_get_drvdata(dev); 67 struct ad9951_state *st = iio_priv(idev); 68 69 xfer.len = 3; 70 xfer.tx_buf = &config->asf[0]; 71 mutex_lock(&st->lock); 72 73 spi_message_init(&msg); 74 spi_message_add_tail(&xfer, &msg); 75 ret = spi_sync(st->sdev, &msg); 76 if (ret) 77 goto error_ret; 78 79 xfer.len = 2; 80 xfer.tx_buf = &config->arr[0]; 81 82 spi_message_init(&msg); 83 spi_message_add_tail(&xfer, &msg); 84 ret = spi_sync(st->sdev, &msg); 85 if (ret) 86 goto error_ret; 87 88 xfer.len = 5; 89 xfer.tx_buf = &config->ftw0[0]; 90 91 spi_message_init(&msg); 92 spi_message_add_tail(&xfer, &msg); 93 ret = spi_sync(st->sdev, &msg); 94 if (ret) 95 goto error_ret; 96 97 xfer.len = 3; 98 xfer.tx_buf = &config->ftw1[0]; 99 100 spi_message_init(&msg); 101 spi_message_add_tail(&xfer, &msg); 102 ret = spi_sync(st->sdev, &msg); 103 if (ret) 104 goto error_ret; 105error_ret: 106 mutex_unlock(&st->lock); 107 108 return ret ? ret : len; 109} 110 111static IIO_DEVICE_ATTR(dds, S_IWUSR, NULL, ad9951_set_parameter, 0); 112 113static void ad9951_init(struct ad9951_state *st) 114{ 115 struct spi_message msg; 116 struct spi_transfer xfer; 117 int ret; 118 u8 cfr[5]; 119 120 cfr[0] = CFR1; 121 cfr[1] = 0; 122 cfr[2] = LSB_FST | CLR_PHA | SINE_OPT | ACLR_PHA; 123 cfr[3] = AUTO_OSK | OSKEN | LOAD_ARR; 124 cfr[4] = 0; 125 126 mutex_lock(&st->lock); 127 128 xfer.len = 5; 129 xfer.tx_buf = 𝔠 130 131 spi_message_init(&msg); 132 spi_message_add_tail(&xfer, &msg); 133 ret = spi_sync(st->sdev, &msg); 134 if (ret) 135 goto error_ret; 136 137 cfr[0] = CFR2; 138 cfr[1] = VCO_RANGE; 139 cfr[2] = HSPD_SYNC; 140 cfr[3] = 0; 141 142 xfer.len = 4; 143 xfer.tx_buf = 𝔠 144 145 spi_message_init(&msg); 146 spi_message_add_tail(&xfer, &msg); 147 ret = spi_sync(st->sdev, &msg); 148 if (ret) 149 goto error_ret; 150 151error_ret: 152 mutex_unlock(&st->lock); 153 154 155 156} 157 158static struct attribute *ad9951_attributes[] = { 159 &iio_dev_attr_dds.dev_attr.attr, 160 NULL, 161}; 162 163static const struct attribute_group ad9951_attribute_group = { 164 .name = DRV_NAME, 165 .attrs = ad9951_attributes, 166}; 167 168static const struct iio_info ad9951_info = { 169 .attrs = &ad9951_attribute_group, 170 .driver_module = THIS_MODULE, 171}; 172 173static int __devinit ad9951_probe(struct spi_device *spi) 174{ 175 struct ad9951_state *st; 176 struct iio_dev *idev; 177 int ret = 0; 178 179 idev = iio_allocate_device(sizeof(*st)); 180 if (idev == NULL) { 181 ret = -ENOMEM; 182 goto error_ret; 183 } 184 spi_set_drvdata(spi, idev); 185 st = iio_priv(idev); 186 mutex_init(&st->lock); 187 st->sdev = spi; 188 189 idev->dev.parent = &spi->dev; 190 191 idev->info = &ad9951_info; 192 idev->modes = INDIO_DIRECT_MODE; 193 194 ret = iio_device_register(idev); 195 if (ret) 196 goto error_free_dev; 197 spi->max_speed_hz = 2000000; 198 spi->mode = SPI_MODE_3; 199 spi->bits_per_word = 8; 200 spi_setup(spi); 201 ad9951_init(st); 202 return 0; 203 204error_free_dev: 205 iio_free_device(idev); 206 207error_ret: 208 return ret; 209} 210 211static int __devexit ad9951_remove(struct spi_device *spi) 212{ 213 iio_device_unregister(spi_get_drvdata(spi)); 214 215 return 0; 216} 217 218static struct spi_driver ad9951_driver = { 219 .driver = { 220 .name = DRV_NAME, 221 .owner = THIS_MODULE, 222 }, 223 .probe = ad9951_probe, 224 .remove = __devexit_p(ad9951_remove), 225}; 226 227static __init int ad9951_spi_init(void) 228{ 229 return spi_register_driver(&ad9951_driver); 230} 231module_init(ad9951_spi_init); 232 233static __exit void ad9951_spi_exit(void) 234{ 235 spi_unregister_driver(&ad9951_driver); 236} 237module_exit(ad9951_spi_exit); 238 239MODULE_AUTHOR("Cliff Cai"); 240MODULE_DESCRIPTION("Analog Devices ad9951 driver"); 241MODULE_LICENSE("GPL v2");