2  * Copyright (c) 2014-2015 Imagination Technologies Ltd.
52  * As per device specification, wait six clock cycles after power-up to
74 	writel(val, adc_dev->reg_base + reg);  in cc10001_adc_write_reg()
80 	return readl(adc_dev->reg_base + reg);  in cc10001_adc_read_reg()
86 	ndelay(adc_dev->start_delay_ns);  in cc10001_adc_power_up()
151 	indio_dev = pf->indio_dev;  in cc10001_adc_trigger_h()
153 	data = adc_dev->buf;  in cc10001_adc_trigger_h()
155 	mutex_lock(&adc_dev->lock);  in cc10001_adc_trigger_h()
157 	if (!adc_dev->shared)  in cc10001_adc_trigger_h()
161 	delay_ns = adc_dev->eoc_delay_ns / CC10001_MAX_POLL_COUNT;  in cc10001_adc_trigger_h()
165 	for_each_set_bit(scan_idx, indio_dev->active_scan_mask,  in cc10001_adc_trigger_h()
166 				  indio_dev->masklength) {  in cc10001_adc_trigger_h()
168 		channel = indio_dev->channels[scan_idx].channel;  in cc10001_adc_trigger_h()
173 			dev_warn(&indio_dev->dev,  in cc10001_adc_trigger_h()
182 	if (!adc_dev->shared)  in cc10001_adc_trigger_h()
185 	mutex_unlock(&adc_dev->lock);  in cc10001_adc_trigger_h()
190 	iio_trigger_notify_done(indio_dev->trig);  in cc10001_adc_trigger_h()
202 	if (!adc_dev->shared)  in cc10001_adc_read_raw_voltage()
206 	delay_ns = adc_dev->eoc_delay_ns / CC10001_MAX_POLL_COUNT;  in cc10001_adc_read_raw_voltage()
208 	cc10001_adc_start(adc_dev, chan->channel);  in cc10001_adc_read_raw_voltage()
210 	val = cc10001_adc_poll_done(indio_dev, chan->channel, delay_ns);  in cc10001_adc_read_raw_voltage()
212 	if (!adc_dev->shared)  in cc10001_adc_read_raw_voltage()
228 			return -EBUSY;  in cc10001_adc_read_raw()
229 		mutex_lock(&adc_dev->lock);  in cc10001_adc_read_raw()
231 		mutex_unlock(&adc_dev->lock);  in cc10001_adc_read_raw()
234 			return -EIO;  in cc10001_adc_read_raw()
238 		ret = regulator_get_voltage(adc_dev->reg);  in cc10001_adc_read_raw()
243 		*val2 = chan->scan_type.realbits;  in cc10001_adc_read_raw()
247 		return -EINVAL;  in cc10001_adc_read_raw()
256 	kfree(adc_dev->buf);  in cc10001_update_scan_mode()
257 	adc_dev->buf = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);  in cc10001_update_scan_mode()
258 	if (!adc_dev->buf)  in cc10001_update_scan_mode()
259 		return -ENOMEM;  in cc10001_update_scan_mode()
275 	indio_dev->num_channels = bitmap_weight(&channel_map,  in cc10001_adc_channel_init()
278 	chan_array = devm_kcalloc(&indio_dev->dev, indio_dev->num_channels,  in cc10001_adc_channel_init()
282 		return -ENOMEM;  in cc10001_adc_channel_init()
287 		chan->type = IIO_VOLTAGE;  in cc10001_adc_channel_init()
288 		chan->indexed = 1;  in cc10001_adc_channel_init()
289 		chan->channel = bit;  in cc10001_adc_channel_init()
290 		chan->scan_index = idx;  in cc10001_adc_channel_init()
291 		chan->scan_type.sign = 'u';  in cc10001_adc_channel_init()
292 		chan->scan_type.realbits = 10;  in cc10001_adc_channel_init()
293 		chan->scan_type.storagebits = 16;  in cc10001_adc_channel_init()
294 		chan->info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE);  in cc10001_adc_channel_init()
295 		chan->info_mask_separate = BIT(IIO_CHAN_INFO_RAW);  in cc10001_adc_channel_init()
300 	timestamp->type = IIO_TIMESTAMP;  in cc10001_adc_channel_init()
301 	timestamp->channel = -1;  in cc10001_adc_channel_init()
302 	timestamp->scan_index = idx;  in cc10001_adc_channel_init()
303 	timestamp->scan_type.sign = 's';  in cc10001_adc_channel_init()
304 	timestamp->scan_type.realbits = 64;  in cc10001_adc_channel_init()
305 	timestamp->scan_type.storagebits = 64;  in cc10001_adc_channel_init()
307 	indio_dev->channels = chan_array;  in cc10001_adc_channel_init()
314 	struct device_node *node = pdev->dev.of_node;  in cc10001_adc_probe()
322 	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*adc_dev));  in cc10001_adc_probe()
324 		return -ENOMEM;  in cc10001_adc_probe()
328 	channel_map = GENMASK(CC10001_ADC_NUM_CHANNELS - 1, 0);  in cc10001_adc_probe()
329 	if (!of_property_read_u32(node, "adc-reserved-channels", &ret)) {  in cc10001_adc_probe()
330 		adc_dev->shared = true;  in cc10001_adc_probe()
334 	adc_dev->reg = devm_regulator_get(&pdev->dev, "vref");  in cc10001_adc_probe()
335 	if (IS_ERR(adc_dev->reg))  in cc10001_adc_probe()
336 		return PTR_ERR(adc_dev->reg);  in cc10001_adc_probe()
338 	ret = regulator_enable(adc_dev->reg);  in cc10001_adc_probe()
342 	indio_dev->dev.parent = &pdev->dev;  in cc10001_adc_probe()
343 	indio_dev->name = dev_name(&pdev->dev);  in cc10001_adc_probe()
344 	indio_dev->info = &cc10001_adc_info;  in cc10001_adc_probe()
345 	indio_dev->modes = INDIO_DIRECT_MODE;  in cc10001_adc_probe()
348 	adc_dev->reg_base = devm_ioremap_resource(&pdev->dev, res);  in cc10001_adc_probe()
349 	if (IS_ERR(adc_dev->reg_base)) {  in cc10001_adc_probe()
350 		ret = PTR_ERR(adc_dev->reg_base);  in cc10001_adc_probe()
354 	adc_dev->adc_clk = devm_clk_get(&pdev->dev, "adc");  in cc10001_adc_probe()
355 	if (IS_ERR(adc_dev->adc_clk)) {  in cc10001_adc_probe()
356 		dev_err(&pdev->dev, "failed to get the clock\n");  in cc10001_adc_probe()
357 		ret = PTR_ERR(adc_dev->adc_clk);  in cc10001_adc_probe()
361 	ret = clk_prepare_enable(adc_dev->adc_clk);  in cc10001_adc_probe()
363 		dev_err(&pdev->dev, "failed to enable the clock\n");  in cc10001_adc_probe()
367 	adc_clk_rate = clk_get_rate(adc_dev->adc_clk);  in cc10001_adc_probe()
369 		ret = -EINVAL;  in cc10001_adc_probe()
370 		dev_err(&pdev->dev, "null clock rate!\n");  in cc10001_adc_probe()
374 	adc_dev->eoc_delay_ns = NSEC_PER_SEC / adc_clk_rate;  in cc10001_adc_probe()
375 	adc_dev->start_delay_ns = adc_dev->eoc_delay_ns * CC10001_WAIT_CYCLES;  in cc10001_adc_probe()
378 	 * There is only one register to power-up/power-down the AUX ADC.  in cc10001_adc_probe()
379 	 * If the ADC is shared among multiple CPUs, always power it up here.  in cc10001_adc_probe()
380 	 * If the ADC is used only by the MIPS, power-up/power-down at runtime.  in cc10001_adc_probe()
382 	if (adc_dev->shared)  in cc10001_adc_probe()
385 	/* Setup the ADC channels available on the device */  in cc10001_adc_probe()
390 	mutex_init(&adc_dev->lock);  in cc10001_adc_probe()
408 	clk_disable_unprepare(adc_dev->adc_clk);  in cc10001_adc_probe()
410 	regulator_disable(adc_dev->reg);  in cc10001_adc_probe()
422 	clk_disable_unprepare(adc_dev->adc_clk);  in cc10001_adc_remove()
423 	regulator_disable(adc_dev->reg);  in cc10001_adc_remove()
429 	{ .compatible = "cosmic,10001-adc", },
436 		.name   = "cc10001-adc",
445 MODULE_DESCRIPTION("Cosmic Circuits ADC driver");