1 // SPDX-License-Identifier: (GPL-2.0-only)
47 /* AD7625_CHAN_SPEC - Define a chan spec structure for a specific chip */
65 	/* rate of the clock gated by the "clk_gate" PWM */
75 	 * Waveforms containing the last-requested and rounded
85 	 * EN2 controls the device -3dB bandwidth (and by extension, max
118  * conv_msb_ns is set to 0 instead of the datasheet maximum of 200ns to
120  * modulo 200 and offset by a full period. Values greater than or equal
121  * to the period would be rejected by the PWM API.
189 	cnv_wf.duty_length_ns = st->info->timing_spec->conv_high_ns;  in ad7625_set_sampling_freq()
191 	ret = pwm_round_waveform_might_sleep(st->cnv_pwm, &cnv_wf);  in ad7625_set_sampling_freq()
196 	 * Set up the burst signal for transferring data. period and  in ad7625_set_sampling_freq()
202 		st->info->chan_spec.scan_type.realbits,  in ad7625_set_sampling_freq()
203 		st->ref_clk_rate_hz);  in ad7625_set_sampling_freq()
206 	clk_gate_wf.duty_offset_ns = st->info->timing_spec->conv_msb_ns;  in ad7625_set_sampling_freq()
208 	ret = pwm_round_waveform_might_sleep(st->clk_gate_pwm, &clk_gate_wf);  in ad7625_set_sampling_freq()
212 	st->cnv_wf = cnv_wf;  in ad7625_set_sampling_freq()
213 	st->clk_gate_wf = clk_gate_wf;  in ad7625_set_sampling_freq()
216 	target = DIV_ROUND_CLOSEST(st->ref_clk_rate_hz, freq);  in ad7625_set_sampling_freq()
217 	st->sampling_freq_hz = DIV_ROUND_CLOSEST(st->ref_clk_rate_hz,  in ad7625_set_sampling_freq()
231 		*val = st->sampling_freq_hz;  in ad7625_read_raw()
236 		*val = st->vref_mv;  in ad7625_read_raw()
237 		*val2 = chan->scan_type.realbits - 1;  in ad7625_read_raw()
242 		return -EINVAL;  in ad7625_read_raw()
256 			return -EBUSY;  in ad7625_write_raw()
261 		return -EINVAL;  in ad7625_write_raw()
277 			 "adi,en%d-always-on", i);  in ad7625_parse_mode()
278 		/* Set the device to 0b0000 (power-down mode) by default */  in ad7625_parse_mode()
279 		st->en_gpios[i] = devm_gpiod_get_optional(dev, en_gpio_buf,  in ad7625_parse_mode()
281 		if (IS_ERR(st->en_gpios[i]))  in ad7625_parse_mode()
282 			return dev_err_probe(dev, PTR_ERR(st->en_gpios[i]),  in ad7625_parse_mode()
286 		if (st->en_gpios[i] && en_always_on[i])  in ad7625_parse_mode()
287 			return dev_err_probe(dev, -EINVAL,  in ad7625_parse_mode()
288 				"cannot have adi,en%d-always-on and en%d-gpios\n", i, i);  in ad7625_parse_mode()
291 		en_may_be_on[i] = en_always_on[i] || st->en_gpios[i];  in ad7625_parse_mode()
292 		en_always_off[i] = !en_always_on[i] && !st->en_gpios[i];  in ad7625_parse_mode()
299 	st->can_power_down = en_may_be_off[1] && en_may_be_off[0] &&  in ad7625_parse_mode()
300 			     st->info->has_power_down_state;  in ad7625_parse_mode()
305 	st->can_refin = en_may_be_off[1] && en_may_be_on[0];  in ad7625_parse_mode()
306 	/* 4.096V can be applied to REF when the EN mode is 0bXX10. */  in ad7625_parse_mode()
307 	st->can_ref_4v096 = en_may_be_on[1] && en_may_be_off[0];  in ad7625_parse_mode()
309 	/* Avoid AD796x-specific setup if the part is an AD762x */  in ad7625_parse_mode()
316 		return dev_err_probe(dev, -EINVAL,  in ad7625_parse_mode()
319 	 * 5V can be applied to the AD796x REF pin when the EN mode is  in ad7625_parse_mode()
323 	st->can_ref_5v = st->can_refin;  in ad7625_parse_mode()
326 	 * specified and not hard-wired, then we can configure it to  in ad7625_parse_mode()
329 	st->can_narrow_bandwidth = en_may_be_on[2];  in ad7625_parse_mode()
331 	st->can_wide_bandwidth = en_may_be_off[2];  in ad7625_parse_mode()
333 	st->can_snooze = en_may_be_on[1] && en_may_be_on[0];  in ad7625_parse_mode()
335 	st->can_test_pattern = en_may_be_off[3] && en_may_be_on[2] &&  in ad7625_parse_mode()
346 		gpiod_set_value_cansleep(st->en_gpios[1], 0);  in ad7625_set_en_gpios_for_vref()
347 		gpiod_set_value_cansleep(st->en_gpios[0], 1);  in ad7625_set_en_gpios_for_vref()
349 		gpiod_set_value_cansleep(st->en_gpios[1], 1);  in ad7625_set_en_gpios_for_vref()
350 		gpiod_set_value_cansleep(st->en_gpios[0], 0);  in ad7625_set_en_gpios_for_vref()
354 		 * neither REF nor REFIN is provided  in ad7625_set_en_gpios_for_vref()
356 		gpiod_set_value_cansleep(st->en_gpios[1], 1);  in ad7625_set_en_gpios_for_vref()
357 		gpiod_set_value_cansleep(st->en_gpios[0], 1);  in ad7625_set_en_gpios_for_vref()
366 		if (!st->can_power_down)  in ad7960_set_mode()
367 			return -EINVAL;  in ad7960_set_mode()
369 		gpiod_set_value_cansleep(st->en_gpios[2], 0);  in ad7960_set_mode()
370 		gpiod_set_value_cansleep(st->en_gpios[1], 0);  in ad7960_set_mode()
371 		gpiod_set_value_cansleep(st->en_gpios[0], 0);  in ad7960_set_mode()
376 		if (!st->can_snooze)  in ad7960_set_mode()
377 			return -EINVAL;  in ad7960_set_mode()
379 		gpiod_set_value_cansleep(st->en_gpios[1], 1);  in ad7960_set_mode()
380 		gpiod_set_value_cansleep(st->en_gpios[0], 1);  in ad7960_set_mode()
385 		if (!st->can_narrow_bandwidth)  in ad7960_set_mode()
386 			return -EINVAL;  in ad7960_set_mode()
388 		gpiod_set_value_cansleep(st->en_gpios[2], 1);  in ad7960_set_mode()
394 		if (!st->can_wide_bandwidth)  in ad7960_set_mode()
395 			return -EINVAL;  in ad7960_set_mode()
397 		gpiod_set_value_cansleep(st->en_gpios[2], 0);  in ad7960_set_mode()
403 		if (!st->can_test_pattern)  in ad7960_set_mode()
404 			return -EINVAL;  in ad7960_set_mode()
406 		gpiod_set_value_cansleep(st->en_gpios[3], 0);  in ad7960_set_mode()
407 		gpiod_set_value_cansleep(st->en_gpios[2], 1);  in ad7960_set_mode()
408 		gpiod_set_value_cansleep(st->en_gpios[1], 0);  in ad7960_set_mode()
409 		gpiod_set_value_cansleep(st->en_gpios[0], 0);  in ad7960_set_mode()
414 		return -EINVAL;  in ad7960_set_mode()
423 	ret = pwm_set_waveform_might_sleep(st->cnv_pwm, &st->cnv_wf, false);  in ad7625_buffer_preenable()
427 	ret = pwm_set_waveform_might_sleep(st->clk_gate_pwm,  in ad7625_buffer_preenable()
428 					   &st->clk_gate_wf, false);  in ad7625_buffer_preenable()
431 		pwm_disable(st->cnv_pwm);  in ad7625_buffer_preenable()
442 	pwm_disable(st->clk_gate_pwm);  in ad7625_buffer_postdisable()
443 	pwm_disable(st->cnv_pwm);  in ad7625_buffer_postdisable()
464 	st->cnv_pwm = devm_pwm_get(dev, "cnv");  in devm_ad7625_pwm_get()
465 	if (IS_ERR(st->cnv_pwm))  in devm_ad7625_pwm_get()
466 		return dev_err_probe(dev, PTR_ERR(st->cnv_pwm),  in devm_ad7625_pwm_get()
470 	pwm_disable(st->cnv_pwm);  in devm_ad7625_pwm_get()
472 	st->clk_gate_pwm = devm_pwm_get(dev, "clk_gate");  in devm_ad7625_pwm_get()
473 	if (IS_ERR(st->clk_gate_pwm))  in devm_ad7625_pwm_get()
474 		return dev_err_probe(dev, PTR_ERR(st->clk_gate_pwm),  in devm_ad7625_pwm_get()
478 	pwm_disable(st->clk_gate_pwm);  in devm_ad7625_pwm_get()
487 		return dev_err_probe(dev, -EINVAL,  in devm_ad7625_pwm_get()
490 	st->ref_clk_rate_hz = ref_clk_rate_hz;  in devm_ad7625_pwm_get()
497  * conditionally-optional (depending on part) REF and REFIN voltages
500  * Power-up info for the device says to bring up vio, then vdd2, then
504  * - internal reference: neither REF or REFIN is connected (invalid for
506  * - internal buffer, external reference: REF not connected, REFIN
508  * - external reference: REF connected, REFIN not connected
521 	ret = devm_regulator_get_enable_read_voltage(dev, "ref");  in devm_ad7625_regulator_setup()
522 	if (ret < 0 && ret != -ENODEV)  in devm_ad7625_regulator_setup()
523 		return dev_err_probe(dev, ret, "failed to get REF voltage\n");  in devm_ad7625_regulator_setup()
525 	ref_mv = ret == -ENODEV ? 0 : ret / 1000;  in devm_ad7625_regulator_setup()
528 	if (ret < 0 && ret != -ENODEV)  in devm_ad7625_regulator_setup()
531 	st->have_refin = ret != -ENODEV;  in devm_ad7625_regulator_setup()
533 	if (st->have_refin && !st->can_refin)  in devm_ad7625_regulator_setup()
534 		return dev_err_probe(dev, -EINVAL,  in devm_ad7625_regulator_setup()
537 	if (!st->info->has_internal_vref && !st->have_refin && !ref_mv)  in devm_ad7625_regulator_setup()
538 		return dev_err_probe(dev, -EINVAL,  in devm_ad7625_regulator_setup()
539 				     "Need either REFIN or REF\n");  in devm_ad7625_regulator_setup()
541 	if (st->have_refin && ref_mv)  in devm_ad7625_regulator_setup()
542 		return dev_err_probe(dev, -EINVAL,  in devm_ad7625_regulator_setup()
543 				     "cannot have both REFIN and REF supplies\n");  in devm_ad7625_regulator_setup()
545 	if (ref_mv == 4096 && !st->can_ref_4v096)  in devm_ad7625_regulator_setup()
546 		return dev_err_probe(dev, -EINVAL,  in devm_ad7625_regulator_setup()
547 				     "REF is 4.096V in unsupported mode\n");  in devm_ad7625_regulator_setup()
549 	if (ref_mv == 5000 && !st->can_ref_5v)  in devm_ad7625_regulator_setup()
550 		return dev_err_probe(dev, -EINVAL,  in devm_ad7625_regulator_setup()
551 				     "REF is 5V in unsupported mode\n");  in devm_ad7625_regulator_setup()
553 	st->vref_mv = ref_mv ?: AD7625_INTERNAL_REF_MV;  in devm_ad7625_regulator_setup()
560 	struct device *dev = &pdev->dev;  in ad7625_probe()
568 		return -ENOMEM;  in ad7625_probe()
572 	st->info = device_get_match_data(dev);  in ad7625_probe()
573 	if (!st->info)  in ad7625_probe()
574 		return dev_err_probe(dev, -EINVAL, "no chip info\n");  in ad7625_probe()
576 	if (device_property_read_bool(dev, "adi,no-dco"))  in ad7625_probe()
577 		return dev_err_probe(dev, -EINVAL,  in ad7625_probe()
578 				     "self-clocked mode not supported\n");  in ad7625_probe()
580 	if (st->info->has_bandwidth_control)  in ad7625_probe()
593 	if (!st->info->has_bandwidth_control) {  in ad7625_probe()
594 		ad7625_set_en_gpios_for_vref(st, st->have_refin, st->vref_mv);  in ad7625_probe()
600 		if (st->can_wide_bandwidth) {  in ad7625_probe()
602 					      st->have_refin, st->vref_mv);  in ad7625_probe()
603 		} else if (st->can_narrow_bandwidth) {  in ad7625_probe()
605 					      st->have_refin, st->vref_mv);  in ad7625_probe()
607 			return dev_err_probe(dev, -EINVAL,  in ad7625_probe()
612 			return dev_err_probe(dev, -EINVAL,  in ad7625_probe()
620 	indio_dev->channels = &st->info->chan_spec;  in ad7625_probe()
621 	indio_dev->num_channels = 1;  in ad7625_probe()
622 	indio_dev->name = st->info->name;  in ad7625_probe()
623 	indio_dev->info = &ad7625_info;  in ad7625_probe()
624 	indio_dev->setup_ops = &ad7625_buffer_setup_ops;  in ad7625_probe()
626 	st->back = devm_iio_backend_get(dev, NULL);  in ad7625_probe()
627 	if (IS_ERR(st->back))  in ad7625_probe()
628 		return dev_err_probe(dev, PTR_ERR(st->back),  in ad7625_probe()
631 	ret = devm_iio_backend_request_buffer(dev, st->back, indio_dev);  in ad7625_probe()
635 	ret = devm_iio_backend_enable(dev, st->back);  in ad7625_probe()
644 	default_sample_freq = st->info->max_sample_freq_hz;  in ad7625_probe()
645 	if (st->info->has_bandwidth_control && !st->can_wide_bandwidth)  in ad7625_probe()