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9#include <linux/interrupt.h>
10#include <linux/gpio.h>
11#include <linux/fs.h>
12#include <linux/device.h>
13#include <linux/kernel.h>
14#include <linux/spi/spi.h>
15#include <linux/slab.h>
16#include <linux/sysfs.h>
17#include <linux/delay.h>
18
19#include "../iio.h"
20#include "../sysfs.h"
21#include "dac.h"
22#include "ad5624r.h"
23
24
25
26
27
28
29struct ad5624r_state {
30 struct iio_dev *indio_dev;
31 struct spi_device *us;
32 int data_len;
33 int ldac_mode;
34 int dac_power_mode[AD5624R_DAC_CHANNELS];
35 int internal_ref;
36};
37
38static int ad5624r_spi_write(struct spi_device *spi,
39 u8 cmd, u8 addr, u16 val, u8 len)
40{
41 u32 data;
42 u8 msg[3];
43
44
45
46
47
48
49
50
51 data = (0 << 22) | (cmd << 19) | (addr << 16) | (val << (16 - len));
52 msg[0] = data >> 16;
53 msg[1] = data >> 8;
54 msg[2] = data;
55
56 return spi_write(spi, msg, 3);
57}
58
59static ssize_t ad5624r_write_dac(struct device *dev,
60 struct device_attribute *attr,
61 const char *buf, size_t len)
62{
63 long readin;
64 int ret;
65 struct iio_dev *indio_dev = dev_get_drvdata(dev);
66 struct ad5624r_state *st = indio_dev->dev_data;
67 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
68
69 ret = strict_strtol(buf, 10, &readin);
70 if (ret)
71 return ret;
72
73 ret = ad5624r_spi_write(st->us, AD5624R_CMD_WRITE_INPUT_N_UPDATE_N,
74 this_attr->address, readin, st->data_len);
75 return ret ? ret : len;
76}
77
78static ssize_t ad5624r_read_ldac_mode(struct device *dev,
79 struct device_attribute *attr, char *buf)
80{
81 struct iio_dev *indio_dev = dev_get_drvdata(dev);
82 struct ad5624r_state *st = indio_dev->dev_data;
83
84 return sprintf(buf, "%x\n", st->ldac_mode);
85}
86
87static ssize_t ad5624r_write_ldac_mode(struct device *dev,
88 struct device_attribute *attr,
89 const char *buf, size_t len)
90{
91 long readin;
92 int ret;
93 struct iio_dev *indio_dev = dev_get_drvdata(dev);
94 struct ad5624r_state *st = indio_dev->dev_data;
95
96 ret = strict_strtol(buf, 16, &readin);
97 if (ret)
98 return ret;
99
100 ret = ad5624r_spi_write(st->us, AD5624R_CMD_LDAC_SETUP, 0,
101 readin & 0xF, 16);
102 st->ldac_mode = readin & 0xF;
103
104 return ret ? ret : len;
105}
106
107static ssize_t ad5624r_read_dac_power_mode(struct device *dev,
108 struct device_attribute *attr,
109 char *buf)
110{
111 struct iio_dev *indio_dev = dev_get_drvdata(dev);
112 struct ad5624r_state *st = indio_dev->dev_data;
113 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
114
115 return sprintf(buf, "%d\n", st->dac_power_mode[this_attr->address]);
116}
117
118static ssize_t ad5624r_write_dac_power_mode(struct device *dev,
119 struct device_attribute *attr,
120 const char *buf, size_t len)
121{
122 long readin;
123 int ret;
124 struct iio_dev *indio_dev = dev_get_drvdata(dev);
125 struct ad5624r_state *st = indio_dev->dev_data;
126 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
127
128 ret = strict_strtol(buf, 10, &readin);
129 if (ret)
130 return ret;
131
132 ret = ad5624r_spi_write(st->us, AD5624R_CMD_POWERDOWN_DAC, 0,
133 ((readin & 0x3) << 4) |
134 (1 << this_attr->address), 16);
135
136 st->dac_power_mode[this_attr->address] = readin & 0x3;
137
138 return ret ? ret : len;
139}
140
141static ssize_t ad5624r_read_internal_ref_mode(struct device *dev,
142 struct device_attribute *attr,
143 char *buf)
144{
145 struct iio_dev *indio_dev = dev_get_drvdata(dev);
146 struct ad5624r_state *st = indio_dev->dev_data;
147
148 return sprintf(buf, "%d\n", st->internal_ref);
149}
150
151static ssize_t ad5624r_write_internal_ref_mode(struct device *dev,
152 struct device_attribute *attr,
153 const char *buf, size_t len)
154{
155 long readin;
156 int ret;
157 struct iio_dev *indio_dev = dev_get_drvdata(dev);
158 struct ad5624r_state *st = indio_dev->dev_data;
159
160 ret = strict_strtol(buf, 10, &readin);
161 if (ret)
162 return ret;
163
164 ret = ad5624r_spi_write(st->us, AD5624R_CMD_INTERNAL_REFER_SETUP, 0,
165 !!readin, 16);
166
167 st->internal_ref = !!readin;
168
169 return ret ? ret : len;
170}
171
172static IIO_DEV_ATTR_OUT_RAW(0, ad5624r_write_dac, AD5624R_ADDR_DAC0);
173static IIO_DEV_ATTR_OUT_RAW(1, ad5624r_write_dac, AD5624R_ADDR_DAC1);
174static IIO_DEV_ATTR_OUT_RAW(2, ad5624r_write_dac, AD5624R_ADDR_DAC2);
175static IIO_DEV_ATTR_OUT_RAW(3, ad5624r_write_dac, AD5624R_ADDR_DAC3);
176
177static IIO_DEVICE_ATTR(ldac_mode, S_IRUGO | S_IWUSR, ad5624r_read_ldac_mode,
178 ad5624r_write_ldac_mode, 0);
179static IIO_DEVICE_ATTR(internal_ref, S_IRUGO | S_IWUSR,
180 ad5624r_read_internal_ref_mode,
181 ad5624r_write_internal_ref_mode, 0);
182
183#define IIO_DEV_ATTR_DAC_POWER_MODE(_num, _show, _store, _addr) \
184 IIO_DEVICE_ATTR(dac_power_mode_##_num, S_IRUGO | S_IWUSR, _show, _store, _addr)
185
186static IIO_DEV_ATTR_DAC_POWER_MODE(0, ad5624r_read_dac_power_mode,
187 ad5624r_write_dac_power_mode, 0);
188static IIO_DEV_ATTR_DAC_POWER_MODE(1, ad5624r_read_dac_power_mode,
189 ad5624r_write_dac_power_mode, 1);
190static IIO_DEV_ATTR_DAC_POWER_MODE(2, ad5624r_read_dac_power_mode,
191 ad5624r_write_dac_power_mode, 2);
192static IIO_DEV_ATTR_DAC_POWER_MODE(3, ad5624r_read_dac_power_mode,
193 ad5624r_write_dac_power_mode, 3);
194
195static struct attribute *ad5624r_attributes[] = {
196 &iio_dev_attr_out0_raw.dev_attr.attr,
197 &iio_dev_attr_out1_raw.dev_attr.attr,
198 &iio_dev_attr_out2_raw.dev_attr.attr,
199 &iio_dev_attr_out3_raw.dev_attr.attr,
200 &iio_dev_attr_dac_power_mode_0.dev_attr.attr,
201 &iio_dev_attr_dac_power_mode_1.dev_attr.attr,
202 &iio_dev_attr_dac_power_mode_2.dev_attr.attr,
203 &iio_dev_attr_dac_power_mode_3.dev_attr.attr,
204 &iio_dev_attr_ldac_mode.dev_attr.attr,
205 &iio_dev_attr_internal_ref.dev_attr.attr,
206 NULL,
207};
208
209static const struct attribute_group ad5624r_attribute_group = {
210 .attrs = ad5624r_attributes,
211};
212
213static int __devinit ad5624r_probe(struct spi_device *spi)
214{
215 struct ad5624r_state *st;
216 int ret = 0;
217
218 st = kzalloc(sizeof(*st), GFP_KERNEL);
219 if (st == NULL) {
220 ret = -ENOMEM;
221 goto error_ret;
222 }
223 spi_set_drvdata(spi, st);
224
225 st->data_len = spi_get_device_id(spi)->driver_data;
226
227 st->us = spi;
228 st->indio_dev = iio_allocate_device();
229 if (st->indio_dev == NULL) {
230 ret = -ENOMEM;
231 goto error_free_st;
232 }
233 st->indio_dev->dev.parent = &spi->dev;
234 st->indio_dev->num_interrupt_lines = 0;
235 st->indio_dev->event_attrs = NULL;
236
237 st->indio_dev->attrs = &ad5624r_attribute_group;
238 st->indio_dev->dev_data = (void *)(st);
239 st->indio_dev->driver_module = THIS_MODULE;
240 st->indio_dev->modes = INDIO_DIRECT_MODE;
241
242 ret = iio_device_register(st->indio_dev);
243 if (ret)
244 goto error_free_dev;
245
246 spi->mode = SPI_MODE_0;
247 spi_setup(spi);
248
249 return 0;
250
251error_free_dev:
252 iio_free_device(st->indio_dev);
253error_free_st:
254 kfree(st);
255error_ret:
256 return ret;
257}
258
259static int __devexit ad5624r_remove(struct spi_device *spi)
260{
261 struct ad5624r_state *st = spi_get_drvdata(spi);
262
263 iio_device_unregister(st->indio_dev);
264 kfree(st);
265
266 return 0;
267}
268
269static const struct spi_device_id ad5624r_id[] = {
270 {"ad5624r", 12},
271 {"ad5644r", 14},
272 {"ad5664r", 16},
273 {}
274};
275
276static struct spi_driver ad5624r_driver = {
277 .driver = {
278 .name = "ad5624r",
279 .owner = THIS_MODULE,
280 },
281 .probe = ad5624r_probe,
282 .remove = __devexit_p(ad5624r_remove),
283 .id_table = ad5624r_id,
284};
285
286static __init int ad5624r_spi_init(void)
287{
288 return spi_register_driver(&ad5624r_driver);
289}
290module_init(ad5624r_spi_init);
291
292static __exit void ad5624r_spi_exit(void)
293{
294 spi_unregister_driver(&ad5624r_driver);
295}
296module_exit(ad5624r_spi_exit);
297
298MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
299MODULE_DESCRIPTION("Analog Devices AD5624/44/64R DAC spi driver");
300MODULE_LICENSE("GPL v2");
301
