33 #define		AT91_ADC_SWRST		(1 << 0)	/* Software Reset */
34 #define		AT91_ADC_START		(1 << 1)	/* Start Conversion */
39 #define		AT91_ADC_TSAMOD_TS_ONLY_MODE		(1 << 0)	/* Touch Screen Only Mode */
40 #define		AT91_ADC_TRGEN		(1 << 0)	/* Trigger Enable */
41 #define		AT91_ADC_TRGSEL		(7 << 1)	/* Trigger Selection */
42 #define			AT91_ADC_TRGSEL_TC0		(0 << 1)
43 #define			AT91_ADC_TRGSEL_TC1		(1 << 1)
44 #define			AT91_ADC_TRGSEL_TC2		(2 << 1)
45 #define			AT91_ADC_TRGSEL_EXTERNAL	(6 << 1)
46 #define		AT91_ADC_LOWRES		(1 << 4)	/* Low Resolution */
47 #define		AT91_ADC_SLEEP		(1 << 5)	/* Sleep Mode */
48 #define		AT91_ADC_PENDET		(1 << 6)	/* Pen contact detection enable */
68 #define		AT91_ADC_CH(n)		(1 << (n))	/* Channel Number */
71 #define		AT91_ADC_EOC(n)		(1 << (n))	/* End of Conversion on Channel N */
72 #define		AT91_ADC_OVRE(n)	(1 << ((n) + 8))/* Overrun Error on Channel N */
73 #define		AT91_ADC_DRDY		(1 << 16)	/* Data Ready */
74 #define		AT91_ADC_GOVRE		(1 << 17)	/* General Overrun Error */
75 #define		AT91_ADC_ENDRX		(1 << 18)	/* End of RX Buffer */
76 #define		AT91_ADC_RXFUFF		(1 << 19)	/* RX Buffer Full */
79 #define		AT91_ADC_SR_DRDY_9X5	(1 << 24)	/* Data Ready */
87 #define		AT91RL_ADC_IER_PEN	(1 << 20)
88 #define		AT91RL_ADC_IER_NOPEN	(1 << 21)
89 #define		AT91_ADC_IER_PEN	(1 << 29)
90 #define		AT91_ADC_IER_NOPEN	(1 << 30)
91 #define		AT91_ADC_IER_XRDY	(1 << 20)
92 #define		AT91_ADC_IER_YRDY	(1 << 21)
93 #define		AT91_ADC_IER_PRDY	(1 << 22)
94 #define		AT91_ADC_ISR_PENS	(1 << 31)
107 #define			AT91_ADC_TSMR_TSMODE_4WIRE_NO_PRESS	(1 << 0)
116 #define		AT91_ADC_TSMR_NOTSDMA	(1 << 22)	/* No Touchscreen DMA */
118 #define		AT91_ADC_TSMR_PENDET_ENA	(1 << 24)	/* Pen contact detection enable */
135 #define AT91_ADC_CHAN(st, ch) \  argument
136 	(st->registers->channel_base + (ch * 4))
137 #define at91_adc_readl(st, reg) \  argument
138 	(readl_relaxed(st->reg_base + reg))
139 #define at91_adc_writel(st, reg, val) \  argument
140 	(writel_relaxed(val, st->reg_base + reg))
267 	struct at91_adc_state *st = iio_priv(idev);  in at91_adc_trigger_handler()  local
275 		st->buffer[j] = at91_adc_readl(st, AT91_ADC_CHAN(st, chan->channel));  in at91_adc_trigger_handler()
279 	iio_push_to_buffers_with_timestamp(idev, st->buffer, pf->timestamp);  in at91_adc_trigger_handler()
284 	at91_adc_readl(st, AT91_ADC_LCDR);  in at91_adc_trigger_handler()
286 	enable_irq(st->irq);  in at91_adc_trigger_handler()
294 	struct at91_adc_state *st = iio_priv(idev);  in handle_adc_eoc_trigger()  local
300 		st->last_value = at91_adc_readl(st, AT91_ADC_CHAN(st, st->chnb));  in handle_adc_eoc_trigger()
302 		at91_adc_readl(st, AT91_ADC_LCDR);  in handle_adc_eoc_trigger()
303 		st->done = true;  in handle_adc_eoc_trigger()
304 		wake_up_interruptible(&st->wq_data_avail);  in handle_adc_eoc_trigger()
310 	struct at91_adc_state *st = iio_priv(idev);  in at91_ts_sample()  local
313 	unsigned int rxp = 1;  in at91_ts_sample()
316 	unsigned int xyz_mask_bits = st->res;  in at91_ts_sample()
317 	unsigned int xyz_mask = (1 << xyz_mask_bits) - 1;  in at91_ts_sample()
320 	/* x position = (x / xscale) * max, max = 2^MAX_POS_BITS - 1 */  in at91_ts_sample()
321 	reg = at91_adc_readl(st, AT91_ADC_TSXPOSR);  in at91_ts_sample()
327 		return -1;  in at91_ts_sample()
331 	/* y position = (y / yscale) * max, max = 2^MAX_POS_BITS - 1 */  in at91_ts_sample()
332 	reg = at91_adc_readl(st, AT91_ADC_TSYPOSR);  in at91_ts_sample()
338 		return -1;  in at91_ts_sample()
343 	reg = at91_adc_readl(st, AT91_ADC_TSPRESSR);  in at91_ts_sample()
351 		pres = st->ts_pressure_threshold;	/* no pen contacted */  in at91_ts_sample()
356 	if (pres < st->ts_pressure_threshold) {  in at91_ts_sample()
359 		input_report_abs(st->ts_input, ABS_X, x);  in at91_ts_sample()
360 		input_report_abs(st->ts_input, ABS_Y, y);  in at91_ts_sample()
361 		input_report_abs(st->ts_input, ABS_PRESSURE, pres);  in at91_ts_sample()
362 		input_report_key(st->ts_input, BTN_TOUCH, 1);  in at91_ts_sample()
363 		input_sync(st->ts_input);  in at91_ts_sample()
374 	struct at91_adc_state *st = iio_priv(idev);  in at91_adc_rl_interrupt()  local
375 	u32 status = at91_adc_readl(st, st->registers->status_register);  in at91_adc_rl_interrupt()
378 	status &= at91_adc_readl(st, AT91_ADC_IMR);  in at91_adc_rl_interrupt()
379 	if (status & GENMASK(st->num_channels - 1, 0))  in at91_adc_rl_interrupt()
384 		reg = at91_adc_readl(st, AT91_ADC_MR);  in at91_adc_rl_interrupt()
386 		at91_adc_writel(st, AT91_ADC_MR, reg);  in at91_adc_rl_interrupt()
388 		at91_adc_writel(st, AT91_ADC_IDR, AT91RL_ADC_IER_PEN);  in at91_adc_rl_interrupt()
389 		at91_adc_writel(st, AT91_ADC_IER, AT91RL_ADC_IER_NOPEN  in at91_adc_rl_interrupt()
392 		at91_adc_writel(st, st->registers->trigger_register,  in at91_adc_rl_interrupt()
394 			AT91_ADC_TRGR_TRGPER_(st->ts_sample_period_val));  in at91_adc_rl_interrupt()
396 		reg = at91_adc_readl(st, AT91_ADC_MR);  in at91_adc_rl_interrupt()
397 		reg |= AT91_ADC_PENDBC_(st->ts_pendbc) & AT91_ADC_PENDBC;  in at91_adc_rl_interrupt()
398 		at91_adc_writel(st, AT91_ADC_MR, reg);  in at91_adc_rl_interrupt()
399 		at91_adc_writel(st, st->registers->trigger_register,  in at91_adc_rl_interrupt()
402 		at91_adc_writel(st, AT91_ADC_IDR, AT91RL_ADC_IER_NOPEN  in at91_adc_rl_interrupt()
404 		at91_adc_writel(st, AT91_ADC_IER, AT91RL_ADC_IER_PEN);  in at91_adc_rl_interrupt()
405 		st->ts_bufferedmeasure = false;  in at91_adc_rl_interrupt()
406 		input_report_key(st->ts_input, BTN_TOUCH, 0);  in at91_adc_rl_interrupt()
407 		input_sync(st->ts_input);  in at91_adc_rl_interrupt()
408 	} else if (status & AT91_ADC_EOC(3) && st->ts_input) {  in at91_adc_rl_interrupt()
410 		if (st->ts_bufferedmeasure) {  in at91_adc_rl_interrupt()
416 			input_report_abs(st->ts_input, ABS_X, st->ts_prev_absx);  in at91_adc_rl_interrupt()
417 			input_report_abs(st->ts_input, ABS_Y, st->ts_prev_absy);  in at91_adc_rl_interrupt()
418 			input_report_key(st->ts_input, BTN_TOUCH, 1);  in at91_adc_rl_interrupt()
419 			input_sync(st->ts_input);  in at91_adc_rl_interrupt()
421 			st->ts_bufferedmeasure = true;  in at91_adc_rl_interrupt()
424 		st->ts_prev_absx = at91_adc_readl(st, AT91_ADC_CHAN(st, 3))  in at91_adc_rl_interrupt()
426 		st->ts_prev_absx /= at91_adc_readl(st, AT91_ADC_CHAN(st, 2));  in at91_adc_rl_interrupt()
428 		st->ts_prev_absy = at91_adc_readl(st, AT91_ADC_CHAN(st, 1))  in at91_adc_rl_interrupt()
430 		st->ts_prev_absy /= at91_adc_readl(st, AT91_ADC_CHAN(st, 0));  in at91_adc_rl_interrupt()
439 	struct at91_adc_state *st = iio_priv(idev);  in at91_adc_9x5_interrupt()  local
440 	u32 status = at91_adc_readl(st, st->registers->status_register);  in at91_adc_9x5_interrupt()
446 	if (status & GENMASK(st->num_channels - 1, 0))  in at91_adc_9x5_interrupt()
450 		at91_adc_writel(st, AT91_ADC_IDR, AT91_ADC_IER_PEN);  in at91_adc_9x5_interrupt()
451 		at91_adc_writel(st, AT91_ADC_IER, AT91_ADC_IER_NOPEN |  in at91_adc_9x5_interrupt()
454 		at91_adc_writel(st, st->registers->trigger_register,  in at91_adc_9x5_interrupt()
456 			AT91_ADC_TRGR_TRGPER_(st->ts_sample_period_val));  in at91_adc_9x5_interrupt()
458 		at91_adc_writel(st, st->registers->trigger_register, 0);  in at91_adc_9x5_interrupt()
459 		at91_adc_writel(st, AT91_ADC_IDR, AT91_ADC_IER_NOPEN |  in at91_adc_9x5_interrupt()
461 		at91_adc_writel(st, AT91_ADC_IER, AT91_ADC_IER_PEN);  in at91_adc_9x5_interrupt()
463 		input_report_key(st->ts_input, BTN_TOUCH, 0);  in at91_adc_9x5_interrupt()
464 		input_sync(st->ts_input);  in at91_adc_9x5_interrupt()
475 			at91_adc_readl(st, AT91_ADC_TSXPOSR);  in at91_adc_9x5_interrupt()
476 			at91_adc_readl(st, AT91_ADC_TSYPOSR);  in at91_adc_9x5_interrupt()
477 			at91_adc_readl(st, AT91_ADC_TSPRESSR);  in at91_adc_9x5_interrupt()
486 	struct at91_adc_state *st = iio_priv(idev);  in at91_adc_channel_init()  local
492 	if (st->touchscreen_type == ATMEL_ADC_TOUCHSCREEN_4WIRE)  in at91_adc_channel_init()
494 	else if (st->touchscreen_type == ATMEL_ADC_TOUCHSCREEN_5WIRE)  in at91_adc_channel_init()
498 	st->channels_mask &= ~rsvd_mask;  in at91_adc_channel_init()
500 	idev->num_channels = bitmap_weight(&st->channels_mask,  in at91_adc_channel_init()
501 					   st->num_channels) + 1;  in at91_adc_channel_init()
504 				  ((idev->num_channels + 1) *  in at91_adc_channel_init()
511 	for_each_set_bit(bit, &st->channels_mask, st->num_channels) {  in at91_adc_channel_init()
515 		chan->indexed = 1;  in at91_adc_channel_init()
519 		chan->scan_type.realbits = st->res;  in at91_adc_channel_init()
528 	timestamp->channel = -1;  in at91_adc_channel_init()
542 	struct at91_adc_state *st = iio_priv(idev);  in at91_adc_get_trigger_value_by_name()  local
545 	for (i = 0; i < st->caps->trigger_number; i++) {  in at91_adc_get_trigger_value_by_name()
570 	struct at91_adc_state *st = iio_priv(idev);  in at91_adc_configure_trigger()  local
571 	const struct at91_adc_reg_desc *reg = st->registers;  in at91_adc_configure_trigger()
572 	u32 status = at91_adc_readl(st, reg->trigger_register);  in at91_adc_configure_trigger()
577 						   st->caps->triggers,  in at91_adc_configure_trigger()
583 		st->buffer = kmalloc(idev->scan_bytes, GFP_KERNEL);  in at91_adc_configure_trigger()
584 		if (st->buffer == NULL)  in at91_adc_configure_trigger()
587 		at91_adc_writel(st, reg->trigger_register,  in at91_adc_configure_trigger()
591 				 st->num_channels) {  in at91_adc_configure_trigger()
593 			at91_adc_writel(st, AT91_ADC_CHER,  in at91_adc_configure_trigger()
597 		at91_adc_writel(st, AT91_ADC_IER, reg->drdy_mask);  in at91_adc_configure_trigger()
600 		at91_adc_writel(st, AT91_ADC_IDR, reg->drdy_mask);  in at91_adc_configure_trigger()
602 		at91_adc_writel(st, reg->trigger_register,  in at91_adc_configure_trigger()
606 				 st->num_channels) {  in at91_adc_configure_trigger()
608 			at91_adc_writel(st, AT91_ADC_CHDR,  in at91_adc_configure_trigger()
611 		kfree(st->buffer);  in at91_adc_configure_trigger()
646 	struct at91_adc_state *st = iio_priv(idev);  in at91_adc_trigger_init()  local
649 	st->trig = devm_kcalloc(&idev->dev,  in at91_adc_trigger_init()
650 				st->caps->trigger_number, sizeof(*st->trig),  in at91_adc_trigger_init()
653 	if (st->trig == NULL) {  in at91_adc_trigger_init()
658 	for (i = 0; i < st->caps->trigger_number; i++) {  in at91_adc_trigger_init()
659 		if (st->caps->triggers[i].is_external && !(st->use_external))  in at91_adc_trigger_init()
662 		st->trig[i] = at91_adc_allocate_trigger(idev,  in at91_adc_trigger_init()
663 							st->caps->triggers + i);  in at91_adc_trigger_init()
664 		if (st->trig[i] == NULL) {  in at91_adc_trigger_init()
676 		iio_trigger_unregister(st->trig[i]);  in at91_adc_trigger_init()
677 		iio_trigger_free(st->trig[i]);  in at91_adc_trigger_init()
685 	struct at91_adc_state *st = iio_priv(idev);  in at91_adc_trigger_remove()  local
688 	for (i = 0; i < st->caps->trigger_number; i++) {  in at91_adc_trigger_remove()
689 		iio_trigger_unregister(st->trig[i]);  in at91_adc_trigger_remove()
690 		iio_trigger_free(st->trig[i]);  in at91_adc_trigger_remove()
709 	struct at91_adc_state *st = iio_priv(idev);  in at91_adc_read_raw()  local
714 		mutex_lock(&st->lock);  in at91_adc_read_raw()
716 		st->chnb = chan->channel;  in at91_adc_read_raw()
717 		at91_adc_writel(st, AT91_ADC_CHER,  in at91_adc_read_raw()
719 		at91_adc_writel(st, AT91_ADC_IER, BIT(chan->channel));  in at91_adc_read_raw()
720 		at91_adc_writel(st, AT91_ADC_CR, AT91_ADC_START);  in at91_adc_read_raw()
722 		ret = wait_event_interruptible_timeout(st->wq_data_avail,  in at91_adc_read_raw()
723 						       st->done,  in at91_adc_read_raw()
729 		at91_adc_writel(st, AT91_ADC_CHDR,  in at91_adc_read_raw()
731 		at91_adc_writel(st, AT91_ADC_IDR, BIT(chan->channel));  in at91_adc_read_raw()
735 			*val = st->last_value;  in at91_adc_read_raw()
736 			st->last_value = 0;  in at91_adc_read_raw()
737 			st->done = false;  in at91_adc_read_raw()
746 		mutex_unlock(&st->lock);  in at91_adc_read_raw()
750 		*val = st->vref_mv;  in at91_adc_read_raw()
766 	 *   Startup Time = (ticks + 1) * 8 / ADC Clock  in calc_startup_ticks_9260()
768 	return round_up((startup_time * adc_clk_khz / 1000) - 1, 8) / 8;  in calc_startup_ticks_9260()
794 		ticks = size - 1;  in calc_startup_ticks_9x5()
800 	struct at91_adc_state *st, struct device *dev)  in at91_adc_probe_dt_ts()  argument
814 		st->touchscreen_type = prop;  in at91_adc_probe_dt_ts()
821 	if (!st->caps->has_tsmr)  in at91_adc_probe_dt_ts()
825 	st->ts_pressure_threshold = prop;  in at91_adc_probe_dt_ts()
826 	if (st->ts_pressure_threshold) {  in at91_adc_probe_dt_ts()
841 	struct at91_adc_state *st = input_get_drvdata(dev);  in atmel_ts_open()  local
843 	if (st->caps->has_tsmr)  in atmel_ts_open()
844 		at91_adc_writel(st, AT91_ADC_IER, AT91_ADC_IER_PEN);  in atmel_ts_open()
846 		at91_adc_writel(st, AT91_ADC_IER, AT91RL_ADC_IER_PEN);  in atmel_ts_open()
852 	struct at91_adc_state *st = input_get_drvdata(dev);  in atmel_ts_close()  local
854 	if (st->caps->has_tsmr)  in atmel_ts_close()
855 		at91_adc_writel(st, AT91_ADC_IDR, AT91_ADC_IER_PEN);  in atmel_ts_close()
857 		at91_adc_writel(st, AT91_ADC_IDR, AT91RL_ADC_IER_PEN);  in atmel_ts_close()
862 	struct at91_adc_state *st = iio_priv(idev);  in at91_ts_hw_init()  local
871 	st->ts_pendbc = round_up(TOUCH_PEN_DETECT_DEBOUNCE_US * adc_clk_khz /  in at91_ts_hw_init()
872 				 1000, 1);  in at91_ts_hw_init()
874 	while (st->ts_pendbc >> ++i)  in at91_ts_hw_init()
876 	if (abs(st->ts_pendbc - (1 << i)) < abs(st->ts_pendbc - (1 << (i - 1))))  in at91_ts_hw_init()
877 		st->ts_pendbc = i;  in at91_ts_hw_init()
879 		st->ts_pendbc = i - 1;  in at91_ts_hw_init()
881 	if (!st->caps->has_tsmr) {  in at91_ts_hw_init()
882 		reg = at91_adc_readl(st, AT91_ADC_MR);  in at91_ts_hw_init()
885 		reg |= AT91_ADC_PENDBC_(st->ts_pendbc) & AT91_ADC_PENDBC;  in at91_ts_hw_init()
886 		at91_adc_writel(st, AT91_ADC_MR, reg);  in at91_ts_hw_init()
889 		at91_adc_writel(st, AT91_ADC_TSR, reg);  in at91_ts_hw_init()
891 		st->ts_sample_period_val = round_up((TOUCH_SAMPLE_PERIOD_US_RL *  in at91_ts_hw_init()
892 						    adc_clk_khz / 1000) - 1, 1);  in at91_ts_hw_init()
905 	if (st->touchscreen_type == ATMEL_ADC_TOUCHSCREEN_4WIRE)  in at91_ts_hw_init()
911 	reg |= AT91_ADC_TSMR_TSAV_(st->caps->ts_filter_average)  in at91_ts_hw_init()
913 	reg |= AT91_ADC_TSMR_PENDBC_(st->ts_pendbc) & AT91_ADC_TSMR_PENDBC;  in at91_ts_hw_init()
918 	at91_adc_writel(st, AT91_ADC_TSMR, reg);  in at91_ts_hw_init()
922 	 * 0 = 200 kOhm, 1 = 150 kOhm, 2 = 100 kOhm, 3 = 50 kOhm  in at91_ts_hw_init()
925 	at91_adc_writel(st, AT91_ADC_ACR, st->caps->ts_pen_detect_sensitivity  in at91_ts_hw_init()
928 	/* Sample Period Time = (TRGPER + 1) / ADCClock */  in at91_ts_hw_init()
929 	st->ts_sample_period_val = round_up((TOUCH_SAMPLE_PERIOD_US *  in at91_ts_hw_init()
930 			adc_clk_khz / 1000) - 1, 1);  in at91_ts_hw_init()
938 	struct at91_adc_state *st = iio_priv(idev);  in at91_ts_register()  local
957 	if (st->caps->has_tsmr) {  in at91_ts_register()
958 		input_set_abs_params(input, ABS_X, 0, (1 << MAX_POS_BITS) - 1,  in at91_ts_register()
960 		input_set_abs_params(input, ABS_Y, 0, (1 << MAX_POS_BITS) - 1,  in at91_ts_register()
964 		if (st->touchscreen_type != ATMEL_ADC_TOUCHSCREEN_4WIRE) {  in at91_ts_register()
971 		input_set_abs_params(input, ABS_X, 0, (1 << MAX_RLPOS_BITS) - 1,  in at91_ts_register()
973 		input_set_abs_params(input, ABS_Y, 0, (1 << MAX_RLPOS_BITS) - 1,  in at91_ts_register()
977 	st->ts_input = input;  in at91_ts_register()
978 	input_set_drvdata(input, st);  in at91_ts_register()
987 	input_free_device(st->ts_input);  in at91_ts_register()
991 static void at91_ts_unregister(struct at91_adc_state *st)  in at91_ts_unregister()  argument
993 	input_unregister_device(st->ts_input);  in at91_ts_unregister()
1002 	struct at91_adc_state *st;  in at91_adc_probe()  local
1010 	st = iio_priv(idev);  in at91_adc_probe()
1012 	st->caps = of_device_get_match_data(&pdev->dev);  in at91_adc_probe()
1014 	st->use_external = of_property_read_bool(node, "atmel,adc-use-external-triggers");  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()
1026 	st->startup_time = prop;  in at91_adc_probe()
1030 	st->sample_hold_time = prop;  in at91_adc_probe()
1035 	st->vref_mv = prop;  in at91_adc_probe()
1037 	st->res = st->caps->high_res_bits;  in at91_adc_probe()
1038 	if (st->caps->low_res_bits &&  in at91_adc_probe()
1041 		st->res = st->caps->low_res_bits;  in at91_adc_probe()
1043 	dev_info(&idev->dev, "Resolution used: %u bits\n", st->res);  in at91_adc_probe()
1045 	st->registers = &st->caps->registers;  in at91_adc_probe()
1046 	st->num_channels = st->caps->num_channels;  in at91_adc_probe()
1049 	if (st->caps->has_ts) {  in at91_adc_probe()
1050 		ret = at91_adc_probe_dt_ts(node, st, &idev->dev);  in at91_adc_probe()
1061 	st->irq = platform_get_irq(pdev, 0);  in at91_adc_probe()
1062 	if (st->irq < 0)  in at91_adc_probe()
1065 	st->reg_base = devm_platform_ioremap_resource(pdev, 0);  in at91_adc_probe()
1066 	if (IS_ERR(st->reg_base))  in at91_adc_probe()
1067 		return PTR_ERR(st->reg_base);  in at91_adc_probe()
1072 	at91_adc_writel(st, AT91_ADC_CR, AT91_ADC_SWRST);  in at91_adc_probe()
1073 	at91_adc_writel(st, AT91_ADC_IDR, 0xFFFFFFFF);  in at91_adc_probe()
1075 	if (st->caps->has_tsmr)  in at91_adc_probe()
1076 		ret = devm_request_irq(&pdev->dev, st->irq,  in at91_adc_probe()
1080 		ret = devm_request_irq(&pdev->dev, st->irq,  in at91_adc_probe()
1087 	st->clk = devm_clk_get_enabled(&pdev->dev, "adc_clk");  in at91_adc_probe()
1088 	if (IS_ERR(st->clk))  in at91_adc_probe()
1089 		return dev_err_probe(&pdev->dev, PTR_ERR(st->clk),  in at91_adc_probe()
1092 	st->adc_clk = devm_clk_get_enabled(&pdev->dev, "adc_op_clk");  in at91_adc_probe()
1093 	if (IS_ERR(st->adc_clk))  in at91_adc_probe()
1094 		return dev_err_probe(&pdev->dev, PTR_ERR(st->adc_clk),  in at91_adc_probe()
1099 	 * datasheet : ADC Clock = MCK / ((Prescaler + 1) * 2), ADC Clock being  in at91_adc_probe()
1102 	mstrclk = clk_get_rate(st->clk);  in at91_adc_probe()
1103 	adc_clk = clk_get_rate(st->adc_clk);  in at91_adc_probe()
1109 	prsc = (mstrclk / (2 * adc_clk)) - 1;  in at91_adc_probe()
1111 	if (!st->startup_time)  in at91_adc_probe()
1114 	ticks = (*st->caps->calc_startup_ticks)(st->startup_time, adc_clk_khz);  in at91_adc_probe()
1119 	 * The formula thus is : Sample and Hold Time = (shtim + 1) / ADCClock  in at91_adc_probe()
1121 	if (st->sample_hold_time > 0)  in at91_adc_probe()
1122 		shtim = round_up((st->sample_hold_time * adc_clk_khz / 1000)  in at91_adc_probe()
1123 				 - 1, 1);  in at91_adc_probe()
1127 	reg = AT91_ADC_PRESCAL_(prsc) & st->registers->mr_prescal_mask;  in at91_adc_probe()
1128 	reg |= AT91_ADC_STARTUP_(ticks) & st->registers->mr_startup_mask;  in at91_adc_probe()
1129 	if (st->res == st->caps->low_res_bits)  in at91_adc_probe()
1131 	if (st->sleep_mode)  in at91_adc_probe()
1134 	at91_adc_writel(st, AT91_ADC_MR, reg);  in at91_adc_probe()
1142 	init_waitqueue_head(&st->wq_data_avail);  in at91_adc_probe()
1143 	mutex_init(&st->lock);  in at91_adc_probe()
1150 	if (!st->touchscreen_type) {  in at91_adc_probe()
1179 	if (!st->touchscreen_type) {  in at91_adc_probe()
1183 		at91_ts_unregister(st);  in at91_adc_probe()
1191 	struct at91_adc_state *st = iio_priv(idev);  in at91_adc_remove()  local
1194 	if (!st->touchscreen_type) {  in at91_adc_remove()
1198 		at91_ts_unregister(st);  in at91_adc_remove()
1205 	struct at91_adc_state *st = iio_priv(idev);  in at91_adc_suspend()  local
1208 	clk_disable_unprepare(st->clk);  in at91_adc_suspend()
1216 	struct at91_adc_state *st = iio_priv(idev);  in at91_adc_resume()  local
1218 	clk_prepare_enable(st->clk);  in at91_adc_resume()
1229 	{ .name = "timer-counter-1", .value = 0x3 },