2 * AD7606 SPI ADC driver
4 * Copyright 2011 Analog Devices Inc.
6 * Licensed under the GPL-2.
9 #include <linux/interrupt.h>
10 #include <linux/workqueue.h>
11 #include <linux/device.h>
12 #include <linux/kernel.h>
13 #include <linux/slab.h>
14 #include <linux/sysfs.h>
15 #include <linux/list.h>
16 #include <linux/regulator/consumer.h>
17 #include <linux/err.h>
18 #include <linux/gpio.h>
19 #include <linux/delay.h>
20 #include <linux/sched.h>
24 #include "../ring_generic.h"
29 int ad7606_reset(struct ad7606_state *st)
32 gpio_set_value(st->pdata->gpio_reset, 1);
33 ndelay(100); /* t_reset >= 100ns */
34 gpio_set_value(st->pdata->gpio_reset, 0);
41 static int ad7606_scan_direct(struct ad7606_state *st, unsigned ch)
46 gpio_set_value(st->pdata->gpio_convst, 1);
48 ret = wait_event_interruptible(st->wq_data_avail, st->done);
52 if (st->have_frstdata) {
53 ret = st->bops->read_block(st->dev, 1, st->data);
56 if (!gpio_get_value(st->pdata->gpio_frstdata)) {
57 /* This should never happen */
62 ret = st->bops->read_block(st->dev,
63 st->chip_info->num_channels - 1, &st->data[1]);
67 ret = st->bops->read_block(st->dev,
68 st->chip_info->num_channels, st->data);
76 gpio_set_value(st->pdata->gpio_convst, 0);
81 static ssize_t ad7606_scan(struct device *dev,
82 struct device_attribute *attr,
85 struct iio_dev *dev_info = dev_get_drvdata(dev);
86 struct ad7606_state *st = dev_info->dev_data;
87 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
90 mutex_lock(&dev_info->mlock);
91 if (iio_ring_enabled(dev_info))
92 ret = ad7606_scan_from_ring(st, this_attr->address);
94 ret = ad7606_scan_direct(st, this_attr->address);
95 mutex_unlock(&dev_info->mlock);
100 return sprintf(buf, "%d\n", (short) ret);
103 static IIO_DEV_ATTR_IN_RAW(0, ad7606_scan, 0);
104 static IIO_DEV_ATTR_IN_RAW(1, ad7606_scan, 1);
105 static IIO_DEV_ATTR_IN_RAW(2, ad7606_scan, 2);
106 static IIO_DEV_ATTR_IN_RAW(3, ad7606_scan, 3);
107 static IIO_DEV_ATTR_IN_RAW(4, ad7606_scan, 4);
108 static IIO_DEV_ATTR_IN_RAW(5, ad7606_scan, 5);
109 static IIO_DEV_ATTR_IN_RAW(6, ad7606_scan, 6);
110 static IIO_DEV_ATTR_IN_RAW(7, ad7606_scan, 7);
112 static ssize_t ad7606_show_scale(struct device *dev,
113 struct device_attribute *attr,
116 /* Driver currently only support internal vref */
117 struct iio_dev *dev_info = dev_get_drvdata(dev);
118 struct ad7606_state *st = iio_dev_get_devdata(dev_info);
119 unsigned int scale_uv = (st->range * 1000 * 2) >> st->chip_info->bits;
121 return sprintf(buf, "%d.%03d\n", scale_uv / 1000, scale_uv % 1000);
123 static IIO_DEVICE_ATTR(in_scale, S_IRUGO, ad7606_show_scale, NULL, 0);
125 static ssize_t ad7606_show_name(struct device *dev,
126 struct device_attribute *attr,
129 struct iio_dev *dev_info = dev_get_drvdata(dev);
130 struct ad7606_state *st = iio_dev_get_devdata(dev_info);
132 return sprintf(buf, "%s\n", st->chip_info->name);
135 static IIO_DEVICE_ATTR(name, S_IRUGO, ad7606_show_name, NULL, 0);
137 static ssize_t ad7606_show_range(struct device *dev,
138 struct device_attribute *attr, char *buf)
140 struct iio_dev *dev_info = dev_get_drvdata(dev);
141 struct ad7606_state *st = iio_dev_get_devdata(dev_info);
143 return sprintf(buf, "%u\n", st->range);
146 static ssize_t ad7606_store_range(struct device *dev,
147 struct device_attribute *attr, const char *buf, size_t count)
149 struct iio_dev *dev_info = dev_get_drvdata(dev);
150 struct ad7606_state *st = iio_dev_get_devdata(dev_info);
153 if (strict_strtoul(buf, 10, &lval))
155 if (!(lval == 5000 || lval == 10000)) {
156 dev_err(dev, "range is not supported\n");
159 mutex_lock(&dev_info->mlock);
160 gpio_set_value(st->pdata->gpio_range, lval == 10000);
162 mutex_unlock(&dev_info->mlock);
167 static IIO_DEVICE_ATTR(range, S_IRUGO | S_IWUSR, \
168 ad7606_show_range, ad7606_store_range, 0);
169 static IIO_CONST_ATTR(range_available, "5000 10000");
171 static ssize_t ad7606_show_oversampling_ratio(struct device *dev,
172 struct device_attribute *attr, char *buf)
174 struct iio_dev *dev_info = dev_get_drvdata(dev);
175 struct ad7606_state *st = iio_dev_get_devdata(dev_info);
177 return sprintf(buf, "%u\n", st->oversampling);
180 static int ad7606_oversampling_get_index(unsigned val)
182 unsigned char supported[] = {0, 2, 4, 8, 16, 32, 64};
185 for (i = 0; i < ARRAY_SIZE(supported); i++)
186 if (val == supported[i])
192 static ssize_t ad7606_store_oversampling_ratio(struct device *dev,
193 struct device_attribute *attr, const char *buf, size_t count)
195 struct iio_dev *dev_info = dev_get_drvdata(dev);
196 struct ad7606_state *st = iio_dev_get_devdata(dev_info);
200 if (strict_strtoul(buf, 10, &lval))
203 ret = ad7606_oversampling_get_index(lval);
205 dev_err(dev, "oversampling %lu is not supported\n", lval);
209 mutex_lock(&dev_info->mlock);
210 gpio_set_value(st->pdata->gpio_os0, (ret >> 0) & 1);
211 gpio_set_value(st->pdata->gpio_os1, (ret >> 1) & 1);
212 gpio_set_value(st->pdata->gpio_os1, (ret >> 2) & 1);
213 st->oversampling = lval;
214 mutex_unlock(&dev_info->mlock);
219 static IIO_DEVICE_ATTR(oversampling_ratio, S_IRUGO | S_IWUSR,
220 ad7606_show_oversampling_ratio,
221 ad7606_store_oversampling_ratio, 0);
222 static IIO_CONST_ATTR(oversampling_ratio_available, "0 2 4 8 16 32 64");
224 static struct attribute *ad7606_attributes[] = {
225 &iio_dev_attr_in0_raw.dev_attr.attr,
226 &iio_dev_attr_in1_raw.dev_attr.attr,
227 &iio_dev_attr_in2_raw.dev_attr.attr,
228 &iio_dev_attr_in3_raw.dev_attr.attr,
229 &iio_dev_attr_in4_raw.dev_attr.attr,
230 &iio_dev_attr_in5_raw.dev_attr.attr,
231 &iio_dev_attr_in6_raw.dev_attr.attr,
232 &iio_dev_attr_in7_raw.dev_attr.attr,
233 &iio_dev_attr_in_scale.dev_attr.attr,
234 &iio_dev_attr_name.dev_attr.attr,
235 &iio_dev_attr_range.dev_attr.attr,
236 &iio_const_attr_range_available.dev_attr.attr,
237 &iio_dev_attr_oversampling_ratio.dev_attr.attr,
238 &iio_const_attr_oversampling_ratio_available.dev_attr.attr,
242 static mode_t ad7606_attr_is_visible(struct kobject *kobj,
243 struct attribute *attr, int n)
245 struct device *dev = container_of(kobj, struct device, kobj);
246 struct iio_dev *dev_info = dev_get_drvdata(dev);
247 struct ad7606_state *st = iio_dev_get_devdata(dev_info);
249 mode_t mode = attr->mode;
251 if (st->chip_info->num_channels <= 6 &&
252 (attr == &iio_dev_attr_in7_raw.dev_attr.attr ||
253 attr == &iio_dev_attr_in6_raw.dev_attr.attr))
255 else if (st->chip_info->num_channels <= 4 &&
256 (attr == &iio_dev_attr_in5_raw.dev_attr.attr ||
257 attr == &iio_dev_attr_in4_raw.dev_attr.attr))
259 else if (!st->have_os &&
260 (attr == &iio_dev_attr_oversampling_ratio.dev_attr.attr ||
262 &iio_const_attr_oversampling_ratio_available.dev_attr.attr))
264 else if (!st->have_range &&
265 (attr == &iio_dev_attr_range.dev_attr.attr ||
266 attr == &iio_const_attr_range_available.dev_attr.attr))
272 static const struct attribute_group ad7606_attribute_group = {
273 .attrs = ad7606_attributes,
274 .is_visible = ad7606_attr_is_visible,
277 static const struct ad7606_chip_info ad7606_chip_info_tbl[] = {
279 * More devices added in future
284 .sign = IIO_SCAN_EL_TYPE_SIGNED,
291 .sign = IIO_SCAN_EL_TYPE_SIGNED,
298 .sign = IIO_SCAN_EL_TYPE_SIGNED,
304 static int ad7606_request_gpios(struct ad7606_state *st)
306 struct gpio gpio_array[3] = {
308 .gpio = st->pdata->gpio_os0,
309 .flags = GPIOF_DIR_OUT | ((st->oversampling & 1) ?
310 GPIOF_INIT_HIGH : GPIOF_INIT_LOW),
311 .label = "AD7606_OS0",
314 .gpio = st->pdata->gpio_os1,
315 .flags = GPIOF_DIR_OUT | ((st->oversampling & 2) ?
316 GPIOF_INIT_HIGH : GPIOF_INIT_LOW),
317 .label = "AD7606_OS1",
320 .gpio = st->pdata->gpio_os2,
321 .flags = GPIOF_DIR_OUT | ((st->oversampling & 4) ?
322 GPIOF_INIT_HIGH : GPIOF_INIT_LOW),
323 .label = "AD7606_OS2",
328 ret = gpio_request_one(st->pdata->gpio_convst, GPIOF_OUT_INIT_LOW,
331 dev_err(st->dev, "failed to request GPIO CONVST\n");
335 ret = gpio_request_array(gpio_array, ARRAY_SIZE(gpio_array));
340 ret = gpio_request_one(st->pdata->gpio_reset, GPIOF_OUT_INIT_LOW,
343 st->have_reset = true;
345 ret = gpio_request_one(st->pdata->gpio_range, GPIOF_DIR_OUT |
346 ((st->range == 10000) ? GPIOF_INIT_HIGH :
347 GPIOF_INIT_LOW), "AD7606_RANGE");
349 st->have_range = true;
351 ret = gpio_request_one(st->pdata->gpio_stby, GPIOF_OUT_INIT_HIGH,
354 st->have_stby = true;
356 if (gpio_is_valid(st->pdata->gpio_frstdata)) {
357 ret = gpio_request_one(st->pdata->gpio_frstdata, GPIOF_IN,
360 st->have_frstdata = true;
366 static void ad7606_free_gpios(struct ad7606_state *st)
369 gpio_free(st->pdata->gpio_range);
372 gpio_free(st->pdata->gpio_stby);
375 gpio_free(st->pdata->gpio_os0);
376 gpio_free(st->pdata->gpio_os1);
377 gpio_free(st->pdata->gpio_os2);
381 gpio_free(st->pdata->gpio_reset);
383 if (st->have_frstdata)
384 gpio_free(st->pdata->gpio_frstdata);
386 gpio_free(st->pdata->gpio_convst);
392 static irqreturn_t ad7606_interrupt(int irq, void *dev_id)
394 struct ad7606_state *st = dev_id;
396 if (iio_ring_enabled(st->indio_dev)) {
397 if (!work_pending(&st->poll_work))
398 schedule_work(&st->poll_work);
401 wake_up_interruptible(&st->wq_data_avail);
407 struct ad7606_state *ad7606_probe(struct device *dev, int irq,
408 void __iomem *base_address,
410 const struct ad7606_bus_ops *bops)
412 struct ad7606_platform_data *pdata = dev->platform_data;
413 struct ad7606_state *st;
416 st = kzalloc(sizeof(*st), GFP_KERNEL);
426 st->base_address = base_address;
427 st->range = pdata->default_range == 10000 ? 10000 : 5000;
429 ret = ad7606_oversampling_get_index(pdata->default_os);
431 dev_warn(dev, "oversampling %d is not supported\n",
433 st->oversampling = 0;
435 st->oversampling = pdata->default_os;
438 st->reg = regulator_get(dev, "vcc");
439 if (!IS_ERR(st->reg)) {
440 ret = regulator_enable(st->reg);
446 st->chip_info = &ad7606_chip_info_tbl[id];
448 atomic_set(&st->protect_ring, 0);
450 st->indio_dev = iio_allocate_device(0);
451 if (st->indio_dev == NULL) {
453 goto error_disable_reg;
456 st->indio_dev->dev.parent = dev;
457 st->indio_dev->attrs = &ad7606_attribute_group;
458 st->indio_dev->dev_data = (void *)(st);
459 st->indio_dev->driver_module = THIS_MODULE;
460 st->indio_dev->modes = INDIO_DIRECT_MODE;
461 st->indio_dev->name = st->chip_info->name;
463 init_waitqueue_head(&st->wq_data_avail);
465 ret = ad7606_request_gpios(st);
467 goto error_free_device;
469 ret = ad7606_reset(st);
471 dev_warn(st->dev, "failed to RESET: no RESET GPIO specified\n");
473 ret = request_irq(st->irq, ad7606_interrupt,
474 IRQF_TRIGGER_FALLING, st->chip_info->name, st);
476 goto error_free_gpios;
478 ret = ad7606_register_ring_funcs_and_init(st->indio_dev);
482 ret = iio_device_register(st->indio_dev);
486 ret = iio_ring_buffer_register(st->indio_dev->ring, 0);
488 goto error_cleanup_ring;
493 ad7606_ring_cleanup(st->indio_dev);
494 iio_device_unregister(st->indio_dev);
497 free_irq(st->irq, st);
500 ad7606_free_gpios(st);
503 iio_free_device(st->indio_dev);
506 if (!IS_ERR(st->reg))
507 regulator_disable(st->reg);
509 if (!IS_ERR(st->reg))
510 regulator_put(st->reg);
516 int ad7606_remove(struct ad7606_state *st)
518 struct iio_dev *indio_dev = st->indio_dev;
519 iio_ring_buffer_unregister(indio_dev->ring);
520 ad7606_ring_cleanup(indio_dev);
521 iio_device_unregister(indio_dev);
522 free_irq(st->irq, st);
523 if (!IS_ERR(st->reg)) {
524 regulator_disable(st->reg);
525 regulator_put(st->reg);
528 ad7606_free_gpios(st);
534 void ad7606_suspend(struct ad7606_state *st)
538 gpio_set_value(st->pdata->gpio_range, 1);
539 gpio_set_value(st->pdata->gpio_stby, 0);
543 void ad7606_resume(struct ad7606_state *st)
547 gpio_set_value(st->pdata->gpio_range,
550 gpio_set_value(st->pdata->gpio_stby, 1);
555 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
556 MODULE_DESCRIPTION("Analog Devices AD7606 ADC");
557 MODULE_LICENSE("GPL v2");