1 // SPDX-License-Identifier: GPL-2.0-only
4  * TWL4030 MADC module driver-This driver monitors the real time
8  * Copyright (C) 2011 Texas Instruments Incorporated - https://www.ti.com/
9  * J Keerthy <j-keerthy@ti.com>
11  * Based on twl4030-madc.c
118  * struct twl4030_madc_request - madc request packet for channel conversion
153  * struct twl4030_madc_data - a container for madc info
158  * @use_second_irq:	IRQ selection (main or co-processor)
182 	req.method = madc->use_second_irq ? TWL4030_MADC_SW2 : TWL4030_MADC_SW1;  in twl4030_madc_read()
184 	req.channels = BIT(chan->channel);  in twl4030_madc_read()
194 	*val = req.rbuf[chan->channel];  in twl4030_madc_read()
253 /* Conversion table from -3 to 55 degrees Celcius */
295  * twl4030_madc_channel_raw_read() - Function to read a particular channel value
311 		dev_err(madc->dev, "unable to read register 0x%X\n", reg);  in twl4030_madc_channel_raw_read()
325 	int temp, curr, volt, res, ret;  in twl4030battery_temperature()  local
327 	volt = (raw_volt * TEMP_STEP_SIZE) / TEMP_PSR_R;  in twl4030battery_temperature()
328 	/* Getting and calculating the supply current in micro amperes */  in twl4030battery_temperature()
336 	res = volt * 1000 / curr;  in twl4030battery_temperature()
338 	for (temp = 58; temp >= 0; temp--) {  in twl4030battery_temperature()
340 		if ((actual - res) >= 0)  in twl4030battery_temperature()
364  * @madc - pointer to twl4030_madc_data struct
365  * @reg_base - Base address of the first channel
366  * @Channels - 16 bit bitmap. If the bit is set, channel's value is read
367  * @buf - The channel values are stored here. if read fails error
368  * @raw - Return raw values without conversion
385 			dev_err(madc->dev, "Unable to read register 0x%X\n",  in twl4030_madc_read_channels()
397 				dev_err(madc->dev, "err reading current\n");  in twl4030_madc_read_channels()
401 				buf[i] = buf[i] - 750;  in twl4030_madc_read_channels()
407 				dev_err(madc->dev, "err reading temperature\n");  in twl4030_madc_read_channels()
410 				buf[i] -= 3;  in twl4030_madc_read_channels()
417 			 * conv_result = decimal value of 10-bit conversion  in twl4030_madc_read_channels()
419 			 * step size = 1.5 / (2 ^ 10 -1)  in twl4030_madc_read_channels()
435  * @madc - pointer to twl4030_madc_data struct
436  * @id - irq number to be disabled
446 	ret = twl_i2c_read_u8(TWL4030_MODULE_MADC, &val, madc->imr);  in twl4030_madc_disable_irq()
448 		dev_err(madc->dev, "unable to read imr register 0x%X\n",  in twl4030_madc_disable_irq()
449 			madc->imr);  in twl4030_madc_disable_irq()
453 	ret = twl_i2c_write_u8(TWL4030_MODULE_MADC, val, madc->imr);  in twl4030_madc_disable_irq()
455 		dev_err(madc->dev,  in twl4030_madc_disable_irq()
456 			"unable to write imr register 0x%X\n", madc->imr);  in twl4030_madc_disable_irq()
471 	mutex_lock(&madc->lock);  in twl4030_madc_threaded_irq_handler()
472 	ret = twl_i2c_read_u8(TWL4030_MODULE_MADC, &isr_val, madc->isr);  in twl4030_madc_threaded_irq_handler()
474 		dev_err(madc->dev, "unable to read isr register 0x%X\n",  in twl4030_madc_threaded_irq_handler()
475 			madc->isr);  in twl4030_madc_threaded_irq_handler()
478 	ret = twl_i2c_read_u8(TWL4030_MODULE_MADC, &imr_val, madc->imr);  in twl4030_madc_threaded_irq_handler()
480 		dev_err(madc->dev, "unable to read imr register 0x%X\n",  in twl4030_madc_threaded_irq_handler()
481 			madc->imr);  in twl4030_madc_threaded_irq_handler()
490 			dev_dbg(madc->dev, "Disable interrupt failed %d\n", i);  in twl4030_madc_threaded_irq_handler()
491 		madc->requests[i].result_pending = true;  in twl4030_madc_threaded_irq_handler()
494 		r = &madc->requests[i];  in twl4030_madc_threaded_irq_handler()
496 		if (!r->result_pending)  in twl4030_madc_threaded_irq_handler()
498 		method = &twl4030_conversion_methods[r->method];  in twl4030_madc_threaded_irq_handler()
500 		twl4030_madc_read_channels(madc, method->rbase,  in twl4030_madc_threaded_irq_handler()
501 					   r->channels, r->rbuf, r->raw);  in twl4030_madc_threaded_irq_handler()
503 		r->result_pending = false;  in twl4030_madc_threaded_irq_handler()
504 		r->active = false;  in twl4030_madc_threaded_irq_handler()
506 	mutex_unlock(&madc->lock);  in twl4030_madc_threaded_irq_handler()
516 		r = &madc->requests[i];  in twl4030_madc_threaded_irq_handler()
517 		if (!r->active)  in twl4030_madc_threaded_irq_handler()
519 		method = &twl4030_conversion_methods[r->method];  in twl4030_madc_threaded_irq_handler()
521 		twl4030_madc_read_channels(madc, method->rbase,  in twl4030_madc_threaded_irq_handler()
522 					   r->channels, r->rbuf, r->raw);  in twl4030_madc_threaded_irq_handler()
524 		r->result_pending = false;  in twl4030_madc_threaded_irq_handler()
525 		r->active = false;  in twl4030_madc_threaded_irq_handler()
527 	mutex_unlock(&madc->lock);  in twl4030_madc_threaded_irq_handler()
535  * @madc - pointer to twl4030_madc_data struct
536  * @conv_method - can be TWL4030_MADC_RT, TWL4030_MADC_SW2, TWL4030_MADC_SW1
547 		return -ENOTSUPP;  in twl4030_madc_start_conversion()
551 			       method->ctrl);  in twl4030_madc_start_conversion()
553 		dev_err(madc->dev, "unable to write ctrl register 0x%X\n",  in twl4030_madc_start_conversion()
554 			method->ctrl);  in twl4030_madc_start_conversion()
563  * @madc - pointer to twl4030_madc_data struct
564  * @timeout_ms - timeout value in milliseconds
565  * @status_reg - ctrl register
581 			dev_err(madc->dev,  in twl4030_madc_wait_conversion_ready()
590 	dev_err(madc->dev, "conversion timeout!\n");  in twl4030_madc_wait_conversion_ready()
592 	return -EAGAIN;  in twl4030_madc_wait_conversion_ready()
598  * req->rbuf will be filled with read values of channels based on the
609 		return -EINVAL;  in twl4030_madc_conversion()
611 	mutex_lock(&twl4030_madc->lock);  in twl4030_madc_conversion()
612 	if (req->method < TWL4030_MADC_RT || req->method > TWL4030_MADC_SW2) {  in twl4030_madc_conversion()
613 		ret = -EINVAL;  in twl4030_madc_conversion()
617 	if (twl4030_madc->requests[req->method].active) {  in twl4030_madc_conversion()
618 		ret = -EBUSY;  in twl4030_madc_conversion()
621 	method = &twl4030_conversion_methods[req->method];  in twl4030_madc_conversion()
623 	ret = twl_i2c_write_u16(TWL4030_MODULE_MADC, req->channels, method->sel);  in twl4030_madc_conversion()
625 		dev_err(twl4030_madc->dev,  in twl4030_madc_conversion()
626 			"unable to write sel register 0x%X\n", method->sel);  in twl4030_madc_conversion()
630 	if (req->do_avg) {  in twl4030_madc_conversion()
631 		ret = twl_i2c_write_u16(TWL4030_MODULE_MADC, req->channels,  in twl4030_madc_conversion()
632 				       method->avg);  in twl4030_madc_conversion()
634 			dev_err(twl4030_madc->dev,  in twl4030_madc_conversion()
636 				method->avg);  in twl4030_madc_conversion()
641 	if (req->method == TWL4030_MADC_RT) {  in twl4030_madc_conversion()
642 		ret = -EINVAL;  in twl4030_madc_conversion()
645 	ret = twl4030_madc_start_conversion(twl4030_madc, req->method);  in twl4030_madc_conversion()
648 	twl4030_madc->requests[req->method].active = true;  in twl4030_madc_conversion()
650 	ret = twl4030_madc_wait_conversion_ready(twl4030_madc, 5, method->ctrl);  in twl4030_madc_conversion()
652 		twl4030_madc->requests[req->method].active = false;  in twl4030_madc_conversion()
655 	ret = twl4030_madc_read_channels(twl4030_madc, method->rbase,  in twl4030_madc_conversion()
656 					 req->channels, req->rbuf, req->raw);  in twl4030_madc_conversion()
657 	twl4030_madc->requests[req->method].active = false;  in twl4030_madc_conversion()
660 	mutex_unlock(&twl4030_madc->lock);  in twl4030_madc_conversion()
666  * twl4030_madc_set_current_generator() - setup bias current
670  *		0 - Enables bias current for main battery type reading
671  *		1 - Enables bias current for main battery temperature sensing
687 		dev_err(madc->dev, "unable to read BCICTL1 reg 0x%X",  in twl4030_madc_set_current_generator()
701 		dev_err(madc->dev, "unable to write BCICTL1 reg 0x%X\n",  in twl4030_madc_set_current_generator()
711  * @madc - pointer to twl4030_madc_data struct
712  * @on - Enable or disable MADC software power on bit.
723 		dev_err(madc->dev, "unable to read madc ctrl1 reg 0x%X\n",  in twl4030_madc_set_power()
733 		dev_err(madc->dev, "unable to write madc ctrl1 reg 0x%X\n",  in twl4030_madc_set_power()
747 	struct twl4030_madc_platform_data *pdata = dev_get_platdata(&pdev->dev);  in twl4030_madc_probe()
748 	struct device_node *np = pdev->dev.of_node;  in twl4030_madc_probe()
754 		dev_err(&pdev->dev, "neither platform data nor Device Tree node available\n");  in twl4030_madc_probe()
755 		return -EINVAL;  in twl4030_madc_probe()
758 	iio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*madc));  in twl4030_madc_probe()
760 		dev_err(&pdev->dev, "failed allocating iio device\n");  in twl4030_madc_probe()
761 		return -ENOMEM;  in twl4030_madc_probe()
765 	madc->dev = &pdev->dev;  in twl4030_madc_probe()
767 	iio_dev->name = dev_name(&pdev->dev);  in twl4030_madc_probe()
768 	iio_dev->info = &twl4030_madc_iio_info;  in twl4030_madc_probe()
769 	iio_dev->modes = INDIO_DIRECT_MODE;  in twl4030_madc_probe()
770 	iio_dev->channels = twl4030_madc_iio_channels;  in twl4030_madc_probe()
771 	iio_dev->num_channels = ARRAY_SIZE(twl4030_madc_iio_channels);  in twl4030_madc_probe()
779 		madc->use_second_irq = (pdata->irq_line != 1);  in twl4030_madc_probe()
781 		madc->use_second_irq = of_property_read_bool(np,  in twl4030_madc_probe()
782 				       "ti,system-uses-second-madc-irq");  in twl4030_madc_probe()
784 	madc->imr = madc->use_second_irq ? TWL4030_MADC_IMR2 :  in twl4030_madc_probe()
786 	madc->isr = madc->use_second_irq ? TWL4030_MADC_ISR2 :  in twl4030_madc_probe()
799 		dev_err(&pdev->dev, "unable to read reg BCI CTL1 0x%X\n",  in twl4030_madc_probe()
807 		dev_err(&pdev->dev, "unable to write reg BCI Ctl1 0x%X\n",  in twl4030_madc_probe()
815 		dev_err(&pdev->dev, "unable to read reg GPBR1 0x%X\n",  in twl4030_madc_probe()
822 		dev_info(&pdev->dev, "clk disabled, enabling\n");  in twl4030_madc_probe()
827 			dev_err(&pdev->dev, "unable to write reg GPBR1 0x%X\n",  in twl4030_madc_probe()
834 	mutex_init(&madc->lock);  in twl4030_madc_probe()
837 	ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,  in twl4030_madc_probe()
842 		dev_err(&pdev->dev, "could not request irq\n");  in twl4030_madc_probe()
851 		dev_err(&pdev->dev, "unable to read reg CARKIT_ANA_CTRL  0x%X\n",  in twl4030_madc_probe()
859 		dev_err(&pdev->dev, "unable to write reg CARKIT_ANA_CTRL 0x%X\n",  in twl4030_madc_probe()
865 	madc->usb3v1 = devm_regulator_get(madc->dev, "vusb3v1");  in twl4030_madc_probe()
866 	if (IS_ERR(madc->usb3v1)) {  in twl4030_madc_probe()
867 		ret = -ENODEV;  in twl4030_madc_probe()
871 	ret = regulator_enable(madc->usb3v1);  in twl4030_madc_probe()
873 		dev_err(madc->dev, "could not enable 3v1 bias regulator\n");  in twl4030_madc_probe()
879 		dev_err(&pdev->dev, "could not register iio device\n");  in twl4030_madc_probe()
886 	regulator_disable(madc->usb3v1);  in twl4030_madc_probe()
904 	regulator_disable(madc->usb3v1);  in twl4030_madc_remove()
911 	{ .compatible = "ti,twl4030-madc", },