1 // SPDX-License-Identifier: GPL-2.0-only
3  * Copyright (c) 2014-2015 Imagination Technologies Ltd.
16 #include <linux/iio/buffer.h>
17 #include <linux/iio/iio.h>
18 #include <linux/iio/sysfs.h>
19 #include <linux/iio/trigger.h>
20 #include <linux/iio/trigger_consumer.h>
21 #include <linux/iio/triggered_buffer.h>
47  * As per device specification, wait six clock cycles after power-up to
69 	writel(val, adc_dev->reg_base + reg);  in cc10001_adc_write_reg()
75 	return readl(adc_dev->reg_base + reg);  in cc10001_adc_read_reg()
81 	ndelay(adc_dev->start_delay_ns);  in cc10001_adc_power_up()
146 	indio_dev = pf->indio_dev;  in cc10001_adc_trigger_h()
148 	data = adc_dev->buf;  in cc10001_adc_trigger_h()
150 	mutex_lock(&adc_dev->lock);  in cc10001_adc_trigger_h()
152 	if (!adc_dev->shared)  in cc10001_adc_trigger_h()
156 	delay_ns = adc_dev->eoc_delay_ns / CC10001_MAX_POLL_COUNT;  in cc10001_adc_trigger_h()
161 		channel = indio_dev->channels[scan_idx].channel;  in cc10001_adc_trigger_h()
166 			dev_warn(&indio_dev->dev,  in cc10001_adc_trigger_h()
175 	if (!adc_dev->shared)  in cc10001_adc_trigger_h()
178 	mutex_unlock(&adc_dev->lock);  in cc10001_adc_trigger_h()
183 	iio_trigger_notify_done(indio_dev->trig);  in cc10001_adc_trigger_h()
195 	if (!adc_dev->shared)  in cc10001_adc_read_raw_voltage()
199 	delay_ns = adc_dev->eoc_delay_ns / CC10001_MAX_POLL_COUNT;  in cc10001_adc_read_raw_voltage()
201 	cc10001_adc_start(adc_dev, chan->channel);  in cc10001_adc_read_raw_voltage()
203 	val = cc10001_adc_poll_done(indio_dev, chan->channel, delay_ns);  in cc10001_adc_read_raw_voltage()
205 	if (!adc_dev->shared)  in cc10001_adc_read_raw_voltage()
221 			return -EBUSY;  in cc10001_adc_read_raw()
222 		mutex_lock(&adc_dev->lock);  in cc10001_adc_read_raw()
224 		mutex_unlock(&adc_dev->lock);  in cc10001_adc_read_raw()
227 			return -EIO;  in cc10001_adc_read_raw()
231 		ret = regulator_get_voltage(adc_dev->reg);  in cc10001_adc_read_raw()
236 		*val2 = chan->scan_type.realbits;  in cc10001_adc_read_raw()
240 		return -EINVAL;  in cc10001_adc_read_raw()
249 	kfree(adc_dev->buf);  in cc10001_update_scan_mode()
250 	adc_dev->buf = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);  in cc10001_update_scan_mode()
251 	if (!adc_dev->buf)  in cc10001_update_scan_mode()
252 		return -ENOMEM;  in cc10001_update_scan_mode()
268 	indio_dev->num_channels = bitmap_weight(&channel_map,  in cc10001_adc_channel_init()
271 	chan_array = devm_kcalloc(&indio_dev->dev, indio_dev->num_channels,  in cc10001_adc_channel_init()
275 		return -ENOMEM;  in cc10001_adc_channel_init()
280 		chan->type = IIO_VOLTAGE;  in cc10001_adc_channel_init()
281 		chan->indexed = 1;  in cc10001_adc_channel_init()
282 		chan->channel = bit;  in cc10001_adc_channel_init()
283 		chan->scan_index = idx;  in cc10001_adc_channel_init()
284 		chan->scan_type.sign = 'u';  in cc10001_adc_channel_init()
285 		chan->scan_type.realbits = 10;  in cc10001_adc_channel_init()
286 		chan->scan_type.storagebits = 16;  in cc10001_adc_channel_init()
287 		chan->info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE);  in cc10001_adc_channel_init()
288 		chan->info_mask_separate = BIT(IIO_CHAN_INFO_RAW);  in cc10001_adc_channel_init()
293 	timestamp->type = IIO_TIMESTAMP;  in cc10001_adc_channel_init()
294 	timestamp->channel = -1;  in cc10001_adc_channel_init()
295 	timestamp->scan_index = idx;  in cc10001_adc_channel_init()
296 	timestamp->scan_type.sign = 's';  in cc10001_adc_channel_init()
297 	timestamp->scan_type.realbits = 64;  in cc10001_adc_channel_init()
298 	timestamp->scan_type.storagebits = 64;  in cc10001_adc_channel_init()
300 	indio_dev->channels = chan_array;  in cc10001_adc_channel_init()
317 	struct device *dev = &pdev->dev;  in cc10001_adc_probe()
318 	struct device_node *node = dev->of_node;  in cc10001_adc_probe()
327 		return -ENOMEM;  in cc10001_adc_probe()
331 	channel_map = GENMASK(CC10001_ADC_NUM_CHANNELS - 1, 0);  in cc10001_adc_probe()
332 	if (!of_property_read_u32(node, "adc-reserved-channels", &ret)) {  in cc10001_adc_probe()
333 		adc_dev->shared = true;  in cc10001_adc_probe()
337 	adc_dev->reg = devm_regulator_get(dev, "vref");  in cc10001_adc_probe()
338 	if (IS_ERR(adc_dev->reg))  in cc10001_adc_probe()
339 		return PTR_ERR(adc_dev->reg);  in cc10001_adc_probe()
341 	ret = regulator_enable(adc_dev->reg);  in cc10001_adc_probe()
345 	ret = devm_add_action_or_reset(dev, cc10001_reg_disable, adc_dev->reg);  in cc10001_adc_probe()
349 	indio_dev->name = dev_name(dev);  in cc10001_adc_probe()
350 	indio_dev->info = &cc10001_adc_info;  in cc10001_adc_probe()
351 	indio_dev->modes = INDIO_DIRECT_MODE;  in cc10001_adc_probe()
353 	adc_dev->reg_base = devm_platform_ioremap_resource(pdev, 0);  in cc10001_adc_probe()
354 	if (IS_ERR(adc_dev->reg_base))  in cc10001_adc_probe()
355 		return PTR_ERR(adc_dev->reg_base);  in cc10001_adc_probe()
357 	adc_dev->adc_clk = devm_clk_get_enabled(dev, "adc");  in cc10001_adc_probe()
358 	if (IS_ERR(adc_dev->adc_clk)) {  in cc10001_adc_probe()
360 		return PTR_ERR(adc_dev->adc_clk);  in cc10001_adc_probe()
363 	adc_clk_rate = clk_get_rate(adc_dev->adc_clk);  in cc10001_adc_probe()
366 		return -EINVAL;  in cc10001_adc_probe()
369 	adc_dev->eoc_delay_ns = NSEC_PER_SEC / adc_clk_rate;  in cc10001_adc_probe()
370 	adc_dev->start_delay_ns = adc_dev->eoc_delay_ns * CC10001_WAIT_CYCLES;  in cc10001_adc_probe()
373 	 * There is only one register to power-up/power-down the AUX ADC.  in cc10001_adc_probe()
375 	 * If the ADC is used only by the MIPS, power-up/power-down at runtime.  in cc10001_adc_probe()
377 	if (adc_dev->shared)  in cc10001_adc_probe()
388 	mutex_init(&adc_dev->lock);  in cc10001_adc_probe()
399 	{ .compatible = "cosmic,10001-adc", },
406 		.name   = "cc10001-adc",