1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * Driver for the ADC present in the Atmel AT91 evaluation boards.
38 #define		AT91_ADC_TSAMOD		(3 << 0)	/* ADC mode */
39 #define		AT91_ADC_TSAMOD_ADC_ONLY_MODE		(0 << 0)	/* ADC Mode */
103 #define		AT91_ADC_ACR_PENDETSENS	(0x3 << 0)	/* pull-up resistor */
137 	(st->registers->channel_base + (ch * 4))
139 	(readl_relaxed(st->reg_base + reg))
141 	(writel_relaxed(val, st->reg_base + reg))
161  * struct at91_adc_trigger - description of triggers
163  * @value:		value to set in the ADC's trigger setup register
174  * struct at91_adc_reg_desc - Various informations relative to registers
180  * @mr_prescal_mask:	Mask of the PRESCAL field in the adc MR register
181  * @mr_startup_mask:	Mask of the STARTUP field in the adc MR register
200 	/* Pen Detection input pull-up resistor, can be 0~3 */
239 	 * Following ADC channels are shared by touchscreen:
241 	 * CH0 -- Touch screen XP/UL
242 	 * CH1 -- Touch screen XM/UR
243 	 * CH2 -- Touch screen YP/LL
244 	 * CH3 -- Touch screen YM/Sense
245 	 * CH4 -- Touch screen LR(5-wire only)
267 	struct iio_dev *idev = pf->indio_dev;  in at91_adc_trigger_handler()
269 	struct iio_chan_spec const *chan;  in at91_adc_trigger_handler()  local
272 	for (i = 0; i < idev->masklength; i++) {  in at91_adc_trigger_handler()
273 		if (!test_bit(i, idev->active_scan_mask))  in at91_adc_trigger_handler()
275 		chan = idev->channels + i;  in at91_adc_trigger_handler()
276 		st->buffer[j] = at91_adc_readl(st, AT91_ADC_CHAN(st, chan->channel));  in at91_adc_trigger_handler()
280 	iio_push_to_buffers_with_timestamp(idev, st->buffer, pf->timestamp);  in at91_adc_trigger_handler()
282 	iio_trigger_notify_done(idev->trig);  in at91_adc_trigger_handler()
287 	enable_irq(st->irq);  in at91_adc_trigger_handler()
292 /* Handler for classic adc channel eoc trigger */
299 		iio_trigger_poll(idev->trig);  in handle_adc_eoc_trigger()
301 		st->last_value = at91_adc_readl(st, AT91_ADC_CHAN(st, st->chnb));  in handle_adc_eoc_trigger()
304 		st->done = true;  in handle_adc_eoc_trigger()
305 		wake_up_interruptible(&st->wq_data_avail);  in handle_adc_eoc_trigger()
317 	unsigned int xyz_mask_bits = st->res;  in at91_ts_sample()
318 	unsigned int xyz_mask = (1 << xyz_mask_bits) - 1;  in at91_ts_sample()
321 	/* x position = (x / xscale) * max, max = 2^MAX_POS_BITS - 1 */  in at91_ts_sample()
324 	x = (xpos << MAX_POS_BITS) - xpos;  in at91_ts_sample()
327 		dev_err(&idev->dev, "Error: xscale == 0!\n");  in at91_ts_sample()
328 		return -1;  in at91_ts_sample()
332 	/* y position = (y / yscale) * max, max = 2^MAX_POS_BITS - 1 */  in at91_ts_sample()
335 	y = (ypos << MAX_POS_BITS) - ypos;  in at91_ts_sample()
338 		dev_err(&idev->dev, "Error: yscale == 0!\n");  in at91_ts_sample()
339 		return -1;  in at91_ts_sample()
349 		pres = rxp * (x * factor / 1024) * (z2 * factor / z1 - factor)  in at91_ts_sample()
352 		pres = st->ts_pressure_threshold;	/* no pen contacted */  in at91_ts_sample()
354 …dev_dbg(&idev->dev, "xpos = %d, xscale = %d, ypos = %d, yscale = %d, z1 = %d, z2 = %d, press = %d\…  in at91_ts_sample()
357 	if (pres < st->ts_pressure_threshold) {  in at91_ts_sample()
358 		dev_dbg(&idev->dev, "x = %d, y = %d, pressure = %d\n",  in at91_ts_sample()
360 		input_report_abs(st->ts_input, ABS_X, x);  in at91_ts_sample()
361 		input_report_abs(st->ts_input, ABS_Y, y);  in at91_ts_sample()
362 		input_report_abs(st->ts_input, ABS_PRESSURE, pres);  in at91_ts_sample()
363 		input_report_key(st->ts_input, BTN_TOUCH, 1);  in at91_ts_sample()
364 		input_sync(st->ts_input);  in at91_ts_sample()
366 		dev_dbg(&idev->dev, "pressure too low: not reporting\n");  in at91_ts_sample()
376 	u32 status = at91_adc_readl(st, st->registers->status_register);  in at91_adc_rl_interrupt()
380 	if (status & GENMASK(st->num_channels - 1, 0))  in at91_adc_rl_interrupt()
393 		at91_adc_writel(st, st->registers->trigger_register,  in at91_adc_rl_interrupt()
395 			AT91_ADC_TRGR_TRGPER_(st->ts_sample_period_val));  in at91_adc_rl_interrupt()
398 		reg |= AT91_ADC_PENDBC_(st->ts_pendbc) & AT91_ADC_PENDBC;  in at91_adc_rl_interrupt()
400 		at91_adc_writel(st, st->registers->trigger_register,  in at91_adc_rl_interrupt()
406 		st->ts_bufferedmeasure = false;  in at91_adc_rl_interrupt()
407 		input_report_key(st->ts_input, BTN_TOUCH, 0);  in at91_adc_rl_interrupt()
408 		input_sync(st->ts_input);  in at91_adc_rl_interrupt()
409 	} else if (status & AT91_ADC_EOC(3) && st->ts_input) {  in at91_adc_rl_interrupt()
411 		if (st->ts_bufferedmeasure) {  in at91_adc_rl_interrupt()
417 			input_report_abs(st->ts_input, ABS_X, st->ts_prev_absx);  in at91_adc_rl_interrupt()
418 			input_report_abs(st->ts_input, ABS_Y, st->ts_prev_absy);  in at91_adc_rl_interrupt()
419 			input_report_key(st->ts_input, BTN_TOUCH, 1);  in at91_adc_rl_interrupt()
420 			input_sync(st->ts_input);  in at91_adc_rl_interrupt()
422 			st->ts_bufferedmeasure = true;  in at91_adc_rl_interrupt()
425 		st->ts_prev_absx = at91_adc_readl(st, AT91_ADC_CHAN(st, 3))  in at91_adc_rl_interrupt()
427 		st->ts_prev_absx /= at91_adc_readl(st, AT91_ADC_CHAN(st, 2));  in at91_adc_rl_interrupt()
429 		st->ts_prev_absy = at91_adc_readl(st, AT91_ADC_CHAN(st, 1))  in at91_adc_rl_interrupt()
431 		st->ts_prev_absy /= at91_adc_readl(st, AT91_ADC_CHAN(st, 0));  in at91_adc_rl_interrupt()
441 	u32 status = at91_adc_readl(st, st->registers->status_register);  in at91_adc_9x5_interrupt()
447 	if (status & GENMASK(st->num_channels - 1, 0))  in at91_adc_9x5_interrupt()
455 		at91_adc_writel(st, st->registers->trigger_register,  in at91_adc_9x5_interrupt()
457 			AT91_ADC_TRGR_TRGPER_(st->ts_sample_period_val));  in at91_adc_9x5_interrupt()
459 		at91_adc_writel(st, st->registers->trigger_register, 0);  in at91_adc_9x5_interrupt()
464 		input_report_key(st->ts_input, BTN_TOUCH, 0);  in at91_adc_9x5_interrupt()
465 		input_sync(st->ts_input);  in at91_adc_9x5_interrupt()
492 	/* If touchscreen is enable, then reserve the adc channels */  in at91_adc_channel_init()
493 	if (st->touchscreen_type == ATMEL_ADC_TOUCHSCREEN_4WIRE)  in at91_adc_channel_init()
495 	else if (st->touchscreen_type == ATMEL_ADC_TOUCHSCREEN_5WIRE)  in at91_adc_channel_init()
499 	st->channels_mask &= ~rsvd_mask;  in at91_adc_channel_init()
501 	idev->num_channels = bitmap_weight(&st->channels_mask,  in at91_adc_channel_init()
502 					   st->num_channels) + 1;  in at91_adc_channel_init()
504 	chan_array = devm_kzalloc(&idev->dev,  in at91_adc_channel_init()
505 				  ((idev->num_channels + 1) *  in at91_adc_channel_init()
510 		return -ENOMEM;  in at91_adc_channel_init()
512 	for_each_set_bit(bit, &st->channels_mask, st->num_channels) {  in at91_adc_channel_init()
513 		struct iio_chan_spec *chan = chan_array + idx;  in at91_adc_channel_init()  local
515 		chan->type = IIO_VOLTAGE;  in at91_adc_channel_init()
516 		chan->indexed = 1;  in at91_adc_channel_init()
517 		chan->channel = bit;  in at91_adc_channel_init()
518 		chan->scan_index = idx;  in at91_adc_channel_init()
519 		chan->scan_type.sign = 'u';  in at91_adc_channel_init()
520 		chan->scan_type.realbits = st->res;  in at91_adc_channel_init()
521 		chan->scan_type.storagebits = 16;  in at91_adc_channel_init()
522 		chan->info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE);  in at91_adc_channel_init()
523 		chan->info_mask_separate = BIT(IIO_CHAN_INFO_RAW);  in at91_adc_channel_init()
528 	timestamp->type = IIO_TIMESTAMP;  in at91_adc_channel_init()
529 	timestamp->channel = -1;  in at91_adc_channel_init()
530 	timestamp->scan_index = idx;  in at91_adc_channel_init()
531 	timestamp->scan_type.sign = 's';  in at91_adc_channel_init()
532 	timestamp->scan_type.realbits = 64;  in at91_adc_channel_init()
533 	timestamp->scan_type.storagebits = 64;  in at91_adc_channel_init()
535 	idev->channels = chan_array;  in at91_adc_channel_init()
536 	return idev->num_channels;  in at91_adc_channel_init()
546 	for (i = 0; i < st->caps->trigger_number; i++) {  in at91_adc_get_trigger_value_by_name()
548 				"%s-dev%d-%s",  in at91_adc_get_trigger_value_by_name()
549 				idev->name,  in at91_adc_get_trigger_value_by_name()
553 			return -ENOMEM;  in at91_adc_get_trigger_value_by_name()
558 				return -EINVAL;  in at91_adc_get_trigger_value_by_name()
565 	return -EINVAL;  in at91_adc_get_trigger_value_by_name()
572 	const struct at91_adc_reg_desc *reg = st->registers;  in at91_adc_configure_trigger()
573 	u32 status = at91_adc_readl(st, reg->trigger_register);  in at91_adc_configure_trigger()
578 						   st->caps->triggers,  in at91_adc_configure_trigger()
579 						   idev->trig->name);  in at91_adc_configure_trigger()
584 		st->buffer = kmalloc(idev->scan_bytes, GFP_KERNEL);  in at91_adc_configure_trigger()
585 		if (st->buffer == NULL)  in at91_adc_configure_trigger()
586 			return -ENOMEM;  in at91_adc_configure_trigger()
588 		at91_adc_writel(st, reg->trigger_register,  in at91_adc_configure_trigger()
591 		for_each_set_bit(bit, idev->active_scan_mask,  in at91_adc_configure_trigger()
592 				 st->num_channels) {  in at91_adc_configure_trigger()
593 			struct iio_chan_spec const *chan = idev->channels + bit;  in at91_adc_configure_trigger()  local
595 					AT91_ADC_CH(chan->channel));  in at91_adc_configure_trigger()
598 		at91_adc_writel(st, AT91_ADC_IER, reg->drdy_mask);  in at91_adc_configure_trigger()
601 		at91_adc_writel(st, AT91_ADC_IDR, reg->drdy_mask);  in at91_adc_configure_trigger()
603 		at91_adc_writel(st, reg->trigger_register,  in at91_adc_configure_trigger()
606 		for_each_set_bit(bit, idev->active_scan_mask,  in at91_adc_configure_trigger()
607 				 st->num_channels) {  in at91_adc_configure_trigger()
608 			struct iio_chan_spec const *chan = idev->channels + bit;  in at91_adc_configure_trigger()  local
610 					AT91_ADC_CH(chan->channel));  in at91_adc_configure_trigger()
612 		kfree(st->buffer);  in at91_adc_configure_trigger()
628 	trig = iio_trigger_alloc(idev->dev.parent, "%s-dev%d-%s", idev->name,  in at91_adc_allocate_trigger()
629 				 iio_device_id(idev), trigger->name);  in at91_adc_allocate_trigger()
634 	trig->ops = &at91_adc_trigger_ops;  in at91_adc_allocate_trigger()
648 	st->trig = devm_kcalloc(&idev->dev,  in at91_adc_trigger_init()
649 				st->caps->trigger_number, sizeof(*st->trig),  in at91_adc_trigger_init()
652 	if (st->trig == NULL) {  in at91_adc_trigger_init()
653 		ret = -ENOMEM;  in at91_adc_trigger_init()
657 	for (i = 0; i < st->caps->trigger_number; i++) {  in at91_adc_trigger_init()
658 		if (st->caps->triggers[i].is_external && !(st->use_external))  in at91_adc_trigger_init()
661 		st->trig[i] = at91_adc_allocate_trigger(idev,  in at91_adc_trigger_init()
662 							st->caps->triggers + i);  in at91_adc_trigger_init()
663 		if (st->trig[i] == NULL) {  in at91_adc_trigger_init()
664 			dev_err(&idev->dev,  in at91_adc_trigger_init()
666 			ret = -ENOMEM;  in at91_adc_trigger_init()
674 	for (i--; i >= 0; i--) {  in at91_adc_trigger_init()
675 		iio_trigger_unregister(st->trig[i]);  in at91_adc_trigger_init()
676 		iio_trigger_free(st->trig[i]);  in at91_adc_trigger_init()
687 	for (i = 0; i < st->caps->trigger_number; i++) {  in at91_adc_trigger_remove()
688 		iio_trigger_unregister(st->trig[i]);  in at91_adc_trigger_remove()
689 		iio_trigger_free(st->trig[i]);  in at91_adc_trigger_remove()
705 			     struct iio_chan_spec const *chan,  in at91_adc_read_raw()  argument
713 		mutex_lock(&st->lock);  in at91_adc_read_raw()
715 		st->chnb = chan->channel;  in at91_adc_read_raw()
717 				AT91_ADC_CH(chan->channel));  in at91_adc_read_raw()
718 		at91_adc_writel(st, AT91_ADC_IER, BIT(chan->channel));  in at91_adc_read_raw()
721 		ret = wait_event_interruptible_timeout(st->wq_data_avail,  in at91_adc_read_raw()
722 						       st->done,  in at91_adc_read_raw()
725 		/* Disable interrupts, regardless if adc conversion was  in at91_adc_read_raw()
729 				AT91_ADC_CH(chan->channel));  in at91_adc_read_raw()
730 		at91_adc_writel(st, AT91_ADC_IDR, BIT(chan->channel));  in at91_adc_read_raw()
734 			*val = st->last_value;  in at91_adc_read_raw()
735 			st->last_value = 0;  in at91_adc_read_raw()
736 			st->done = false;  in at91_adc_read_raw()
740 			dev_err(&idev->dev, "ADC Channel %d timeout.\n",  in at91_adc_read_raw()
741 				chan->channel);  in at91_adc_read_raw()
742 			ret = -ETIMEDOUT;  in at91_adc_read_raw()
745 		mutex_unlock(&st->lock);  in at91_adc_read_raw()
749 		*val = st->vref_mv;  in at91_adc_read_raw()
750 		*val2 = chan->scan_type.realbits;  in at91_adc_read_raw()
755 	return -EINVAL;  in at91_adc_read_raw()
762 	 * Number of ticks needed to cover the startup time of the ADC  in calc_startup_ticks_9260()
765 	 *   Startup Time = (ticks + 1) * 8 / ADC Clock  in calc_startup_ticks_9260()
767 	return round_up((startup_time * adc_clk_khz / 1000) - 1, 8) / 8;  in calc_startup_ticks_9260()
774 	 * Startup Time = <lookup_table_value> / ADC Clock  in calc_startup_ticks_9x5()
793 		ticks = size - 1;  in calc_startup_ticks_9x5()
804 	ret = of_property_read_u32(node, "atmel,adc-ts-wires", &prop);  in at91_adc_probe_dt_ts()
806 		dev_info(dev, "ADC Touch screen is disabled.\n");  in at91_adc_probe_dt_ts()
813 		st->touchscreen_type = prop;  in at91_adc_probe_dt_ts()
817 		return -EINVAL;  in at91_adc_probe_dt_ts()
820 	if (!st->caps->has_tsmr)  in at91_adc_probe_dt_ts()
823 	of_property_read_u32(node, "atmel,adc-ts-pressure-threshold", &prop);  in at91_adc_probe_dt_ts()
824 	st->ts_pressure_threshold = prop;  in at91_adc_probe_dt_ts()
825 	if (st->ts_pressure_threshold) {  in at91_adc_probe_dt_ts()
829 		return -EINVAL;  in at91_adc_probe_dt_ts()
842 	if (st->caps->has_tsmr)  in atmel_ts_open()
853 	if (st->caps->has_tsmr)  in atmel_ts_close()
866 	/* a Pen Detect Debounce Time is necessary for the ADC Touch to avoid  in at91_ts_hw_init()
870 	st->ts_pendbc = round_up(TOUCH_PEN_DETECT_DEBOUNCE_US * adc_clk_khz /  in at91_ts_hw_init()
873 	while (st->ts_pendbc >> ++i)  in at91_ts_hw_init()
875 	if (abs(st->ts_pendbc - (1 << i)) < abs(st->ts_pendbc - (1 << (i - 1))))  in at91_ts_hw_init()
876 		st->ts_pendbc = i;  in at91_ts_hw_init()
878 		st->ts_pendbc = i - 1;  in at91_ts_hw_init()
880 	if (!st->caps->has_tsmr) {  in at91_ts_hw_init()
884 		reg |= AT91_ADC_PENDBC_(st->ts_pendbc) & AT91_ADC_PENDBC;  in at91_ts_hw_init()
890 		st->ts_sample_period_val = round_up((TOUCH_SAMPLE_PERIOD_US_RL *  in at91_ts_hw_init()
891 						    adc_clk_khz / 1000) - 1, 1);  in at91_ts_hw_init()
901 	dev_dbg(&idev->dev, "adc_clk at: %d KHz, tssctim at: %d\n",  in at91_ts_hw_init()
904 	if (st->touchscreen_type == ATMEL_ADC_TOUCHSCREEN_4WIRE)  in at91_ts_hw_init()
910 	reg |= AT91_ADC_TSMR_TSAV_(st->caps->ts_filter_average)  in at91_ts_hw_init()
912 	reg |= AT91_ADC_TSMR_PENDBC_(st->ts_pendbc) & AT91_ADC_TSMR_PENDBC;  in at91_ts_hw_init()
919 	/* Change adc internal resistor value for better pen detection,  in at91_ts_hw_init()
924 	at91_adc_writel(st, AT91_ADC_ACR, st->caps->ts_pen_detect_sensitivity  in at91_ts_hw_init()
928 	st->ts_sample_period_val = round_up((TOUCH_SAMPLE_PERIOD_US *  in at91_ts_hw_init()
929 			adc_clk_khz / 1000) - 1, 1);  in at91_ts_hw_init()
943 		dev_err(&idev->dev, "Failed to allocate TS device!\n");  in at91_ts_register()
944 		return -ENOMEM;  in at91_ts_register()
947 	input->name = DRIVER_NAME;  in at91_ts_register()
948 	input->id.bustype = BUS_HOST;  in at91_ts_register()
949 	input->dev.parent = &pdev->dev;  in at91_ts_register()
950 	input->open = atmel_ts_open;  in at91_ts_register()
951 	input->close = atmel_ts_close;  in at91_ts_register()
953 	__set_bit(EV_ABS, input->evbit);  in at91_ts_register()
954 	__set_bit(EV_KEY, input->evbit);  in at91_ts_register()
955 	__set_bit(BTN_TOUCH, input->keybit);  in at91_ts_register()
956 	if (st->caps->has_tsmr) {  in at91_ts_register()
957 		input_set_abs_params(input, ABS_X, 0, (1 << MAX_POS_BITS) - 1,  in at91_ts_register()
959 		input_set_abs_params(input, ABS_Y, 0, (1 << MAX_POS_BITS) - 1,  in at91_ts_register()
963 		if (st->touchscreen_type != ATMEL_ADC_TOUCHSCREEN_4WIRE) {  in at91_ts_register()
964 			dev_err(&pdev->dev,  in at91_ts_register()
966 			ret = -EINVAL;  in at91_ts_register()
970 		input_set_abs_params(input, ABS_X, 0, (1 << MAX_RLPOS_BITS) - 1,  in at91_ts_register()
972 		input_set_abs_params(input, ABS_Y, 0, (1 << MAX_RLPOS_BITS) - 1,  in at91_ts_register()
976 	st->ts_input = input;  in at91_ts_register()
986 	input_free_device(st->ts_input);  in at91_ts_register()
992 	input_unregister_device(st->ts_input);  in at91_ts_unregister()
998 	struct device_node *node = pdev->dev.of_node;  in at91_adc_probe()
1005 	idev = devm_iio_device_alloc(&pdev->dev, sizeof(struct at91_adc_state));  in at91_adc_probe()
1007 		return -ENOMEM;  in at91_adc_probe()
1011 	st->caps = of_device_get_match_data(&pdev->dev);  in at91_adc_probe()
1013 	st->use_external = of_property_read_bool(node, "atmel,adc-use-external-triggers");  in at91_adc_probe()
1015 	if (of_property_read_u32(node, "atmel,adc-channels-used", &prop)) {  in at91_adc_probe()
1016 		dev_err(&idev->dev, "Missing adc-channels-used property in the DT.\n");  in at91_adc_probe()
1017 		return -EINVAL;  in at91_adc_probe()
1019 	st->channels_mask = prop;  in at91_adc_probe()
1021 	st->sleep_mode = of_property_read_bool(node, "atmel,adc-sleep-mode");  in at91_adc_probe()
1023 	if (of_property_read_u32(node, "atmel,adc-startup-time", &prop)) {  in at91_adc_probe()
1024 		dev_err(&idev->dev, "Missing adc-startup-time property in the DT.\n");  in at91_adc_probe()
1025 		return -EINVAL;  in at91_adc_probe()
1027 	st->startup_time = prop;  in at91_adc_probe()
1030 	of_property_read_u32(node, "atmel,adc-sample-hold-time", &prop);  in at91_adc_probe()
1031 	st->sample_hold_time = prop;  in at91_adc_probe()
1033 	if (of_property_read_u32(node, "atmel,adc-vref", &prop)) {  in at91_adc_probe()
1034 		dev_err(&idev->dev, "Missing adc-vref property in the DT.\n");  in at91_adc_probe()
1035 		return -EINVAL;  in at91_adc_probe()
1037 	st->vref_mv = prop;  in at91_adc_probe()
1039 	st->res = st->caps->high_res_bits;  in at91_adc_probe()
1040 	if (st->caps->low_res_bits &&  in at91_adc_probe()
1041 	    !of_property_read_string(node, "atmel,adc-use-res", (const char **)&s)  in at91_adc_probe()
1043 		st->res = st->caps->low_res_bits;  in at91_adc_probe()
1045 	dev_info(&idev->dev, "Resolution used: %u bits\n", st->res);  in at91_adc_probe()
1047 	st->registers = &st->caps->registers;  in at91_adc_probe()
1048 	st->num_channels = st->caps->num_channels;  in at91_adc_probe()
1051 	if (st->caps->has_ts) {  in at91_adc_probe()
1052 		ret = at91_adc_probe_dt_ts(node, st, &idev->dev);  in at91_adc_probe()
1059 	idev->name = dev_name(&pdev->dev);  in at91_adc_probe()
1060 	idev->modes = INDIO_DIRECT_MODE;  in at91_adc_probe()
1061 	idev->info = &at91_adc_info;  in at91_adc_probe()
1063 	st->irq = platform_get_irq(pdev, 0);  in at91_adc_probe()
1064 	if (st->irq < 0)  in at91_adc_probe()
1065 		return -ENODEV;  in at91_adc_probe()
1067 	st->reg_base = devm_platform_ioremap_resource(pdev, 0);  in at91_adc_probe()
1068 	if (IS_ERR(st->reg_base))  in at91_adc_probe()
1069 		return PTR_ERR(st->reg_base);  in at91_adc_probe()
1078 	if (st->caps->has_tsmr)  in at91_adc_probe()
1079 		ret = request_irq(st->irq, at91_adc_9x5_interrupt, 0,  in at91_adc_probe()
1080 				  pdev->dev.driver->name, idev);  in at91_adc_probe()
1082 		ret = request_irq(st->irq, at91_adc_rl_interrupt, 0,  in at91_adc_probe()
1083 				  pdev->dev.driver->name, idev);  in at91_adc_probe()
1085 		dev_err(&pdev->dev, "Failed to allocate IRQ.\n");  in at91_adc_probe()
1089 	st->clk = devm_clk_get(&pdev->dev, "adc_clk");  in at91_adc_probe()
1090 	if (IS_ERR(st->clk)) {  in at91_adc_probe()
1091 		dev_err(&pdev->dev, "Failed to get the clock.\n");  in at91_adc_probe()
1092 		ret = PTR_ERR(st->clk);  in at91_adc_probe()
1096 	ret = clk_prepare_enable(st->clk);  in at91_adc_probe()
1098 		dev_err(&pdev->dev,  in at91_adc_probe()
1103 	st->adc_clk = devm_clk_get(&pdev->dev, "adc_op_clk");  in at91_adc_probe()
1104 	if (IS_ERR(st->adc_clk)) {  in at91_adc_probe()
1105 		dev_err(&pdev->dev, "Failed to get the ADC clock.\n");  in at91_adc_probe()
1106 		ret = PTR_ERR(st->adc_clk);  in at91_adc_probe()
1110 	ret = clk_prepare_enable(st->adc_clk);  in at91_adc_probe()
1112 		dev_err(&pdev->dev,  in at91_adc_probe()
1113 			"Could not prepare or enable the ADC clock.\n");  in at91_adc_probe()
1119 	 * datasheet : ADC Clock = MCK / ((Prescaler + 1) * 2), ADC Clock being  in at91_adc_probe()
1122 	mstrclk = clk_get_rate(st->clk);  in at91_adc_probe()
1123 	adc_clk = clk_get_rate(st->adc_clk);  in at91_adc_probe()
1126 	dev_dbg(&pdev->dev, "Master clock is set as: %d Hz, adc_clk should set as: %d Hz\n",  in at91_adc_probe()
1129 	prsc = (mstrclk / (2 * adc_clk)) - 1;  in at91_adc_probe()
1131 	if (!st->startup_time) {  in at91_adc_probe()
1132 		dev_err(&pdev->dev, "No startup time available.\n");  in at91_adc_probe()
1133 		ret = -EINVAL;  in at91_adc_probe()
1136 	ticks = (*st->caps->calc_startup_ticks)(st->startup_time, adc_clk_khz);  in at91_adc_probe()
1139 	 * a minimal Sample and Hold Time is necessary for the ADC to guarantee  in at91_adc_probe()
1143 	if (st->sample_hold_time > 0)  in at91_adc_probe()
1144 		shtim = round_up((st->sample_hold_time * adc_clk_khz / 1000)  in at91_adc_probe()
1145 				 - 1, 1);  in at91_adc_probe()
1149 	reg = AT91_ADC_PRESCAL_(prsc) & st->registers->mr_prescal_mask;  in at91_adc_probe()
1150 	reg |= AT91_ADC_STARTUP_(ticks) & st->registers->mr_startup_mask;  in at91_adc_probe()
1151 	if (st->res == st->caps->low_res_bits)  in at91_adc_probe()
1153 	if (st->sleep_mode)  in at91_adc_probe()
1158 	/* Setup the ADC channels available on the board */  in at91_adc_probe()
1161 		dev_err(&pdev->dev, "Couldn't initialize the channels.\n");  in at91_adc_probe()
1165 	init_waitqueue_head(&st->wq_data_avail);  in at91_adc_probe()
1166 	mutex_init(&st->lock);  in at91_adc_probe()
1171 	 * trigger for classic adc.  in at91_adc_probe()
1173 	if (!st->touchscreen_type) {  in at91_adc_probe()
1176 			dev_err(&pdev->dev, "Couldn't initialize the buffer.\n");  in at91_adc_probe()
1182 			dev_err(&pdev->dev, "Couldn't setup the triggers.\n");  in at91_adc_probe()
1196 		dev_err(&pdev->dev, "Couldn't register the device.\n");  in at91_adc_probe()
1203 	if (!st->touchscreen_type) {  in at91_adc_probe()
1210 	clk_disable_unprepare(st->adc_clk);  in at91_adc_probe()
1212 	clk_disable_unprepare(st->clk);  in at91_adc_probe()
1214 	free_irq(st->irq, idev);  in at91_adc_probe()
1224 	if (!st->touchscreen_type) {  in at91_adc_remove()
1230 	clk_disable_unprepare(st->adc_clk);  in at91_adc_remove()
1231 	clk_disable_unprepare(st->clk);  in at91_adc_remove()
1232 	free_irq(st->irq, idev);  in at91_adc_remove()
1244 	clk_disable_unprepare(st->clk);  in at91_adc_suspend()
1254 	clk_prepare_enable(st->clk);  in at91_adc_resume()
1264 	{ .name = "timer-counter-0", .value = 0x1 },
1265 	{ .name = "timer-counter-1", .value = 0x3 },
1266 	{ .name = "timer-counter-2", .value = 0x5 },
1288 	{ .name = "external-rising", .value = 0x1, .is_external = true },
1289 	{ .name = "external-falling", .value = 0x2, .is_external = true },
1290 	{ .name = "external-any", .value = 0x3, .is_external = true },
1374 	{ .compatible = "atmel,at91sam9260-adc", .data = &at91sam9260_caps },
1375 	{ .compatible = "atmel,at91sam9rl-adc", .data = &at91sam9rl_caps },
1376 	{ .compatible = "atmel,at91sam9g45-adc", .data = &at91sam9g45_caps },
1377 	{ .compatible = "atmel,at91sam9x5-adc", .data = &at91sam9x5_caps },
1378 	{ .compatible = "atmel,sama5d3-adc", .data = &sama5d3_caps },
1396 MODULE_DESCRIPTION("Atmel AT91 ADC Driver");
1397 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");