1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * wm831x-auxadc.c  --  AUXADC for Wolfson WM831x PMICs
5  * Copyright 2009-2011 Wolfson Microelectronics PLC.
40 		return -ENOMEM;  in wm831x_auxadc_read_irq()
42 	init_completion(&req->done);  in wm831x_auxadc_read_irq()
43 	req->input = input;  in wm831x_auxadc_read_irq()
44 	req->val = -ETIMEDOUT;  in wm831x_auxadc_read_irq()
46 	mutex_lock(&wm831x->auxadc_lock);  in wm831x_auxadc_read_irq()
49 	list_add(&req->list, &wm831x->auxadc_pending);  in wm831x_auxadc_read_irq()
51 	ena = !wm831x->auxadc_active;  in wm831x_auxadc_read_irq()
57 			dev_err(wm831x->dev, "Failed to enable AUXADC: %d\n",  in wm831x_auxadc_read_irq()
59 			goto out;  in wm831x_auxadc_read_irq()
64 	if (!(wm831x->auxadc_active & (1 << input))) {  in wm831x_auxadc_read_irq()
68 			dev_err(wm831x->dev,  in wm831x_auxadc_read_irq()
70 			goto out;  in wm831x_auxadc_read_irq()
73 		wm831x->auxadc_active |= 1 << input;  in wm831x_auxadc_read_irq()
84 			dev_err(wm831x->dev, "Failed to start AUXADC: %d\n",  in wm831x_auxadc_read_irq()
86 			goto out;  in wm831x_auxadc_read_irq()
90 	mutex_unlock(&wm831x->auxadc_lock);  in wm831x_auxadc_read_irq()
93 	wait_for_completion_timeout(&req->done, msecs_to_jiffies(500));  in wm831x_auxadc_read_irq()
95 	mutex_lock(&wm831x->auxadc_lock);  in wm831x_auxadc_read_irq()
96 	ret = req->val;  in wm831x_auxadc_read_irq()
98 out:  in wm831x_auxadc_read_irq()
99 	list_del(&req->list);  in wm831x_auxadc_read_irq()
100 	mutex_unlock(&wm831x->auxadc_lock);  in wm831x_auxadc_read_irq()
115 		dev_err(wm831x->dev,  in wm831x_auxadc_irq()
116 			"Failed to read AUXADC data: %d\n", ret);  in wm831x_auxadc_irq()
121 		 >> WM831X_AUX_DATA_SRC_SHIFT) - 1;  in wm831x_auxadc_irq()
128 	mutex_lock(&wm831x->auxadc_lock);  in wm831x_auxadc_irq()
133 	wm831x->auxadc_active &= ~(1 << input);  in wm831x_auxadc_irq()
136 	if (!wm831x->auxadc_active)  in wm831x_auxadc_irq()
140 	list_for_each_entry(req, &wm831x->auxadc_pending, list) {  in wm831x_auxadc_irq()
141 		if (req->input == input) {  in wm831x_auxadc_irq()
142 			req->val = val;  in wm831x_auxadc_irq()
143 			complete(&req->done);  in wm831x_auxadc_irq()
147 	mutex_unlock(&wm831x->auxadc_lock);  in wm831x_auxadc_irq()
157 	mutex_lock(&wm831x->auxadc_lock);  in wm831x_auxadc_read_polled()
162 		dev_err(wm831x->dev, "Failed to enable AUXADC: %d\n", ret);  in wm831x_auxadc_read_polled()
163 		goto out;  in wm831x_auxadc_read_polled()
171 		dev_err(wm831x->dev, "Failed to set AUXADC source: %d\n", ret);  in wm831x_auxadc_read_polled()
172 		goto out;  in wm831x_auxadc_read_polled()
178 		dev_err(wm831x->dev, "Failed to start AUXADC: %d\n", ret);  in wm831x_auxadc_read_polled()
182 	/* If we're not using interrupts then read the interrupt status register */  in wm831x_auxadc_read_polled()
187 		dev_err(wm831x->dev,  in wm831x_auxadc_read_polled()
188 			"ISR 1 read failed: %d\n", ret);  in wm831x_auxadc_read_polled()
197 		dev_err(wm831x->dev,  in wm831x_auxadc_read_polled()
199 		ret = -EBUSY;  in wm831x_auxadc_read_polled()
205 		dev_err(wm831x->dev,  in wm831x_auxadc_read_polled()
206 			"Failed to read AUXADC data: %d\n", ret);  in wm831x_auxadc_read_polled()
211 	       >> WM831X_AUX_DATA_SRC_SHIFT) - 1;  in wm831x_auxadc_read_polled()
217 		dev_err(wm831x->dev, "Data from source %d not %d\n",  in wm831x_auxadc_read_polled()
219 		ret = -EINVAL;  in wm831x_auxadc_read_polled()
226 out:  in wm831x_auxadc_read_polled()
227 	mutex_unlock(&wm831x->auxadc_lock);  in wm831x_auxadc_read_polled()
232  * wm831x_auxadc_read: Read a value from the WM831x AUXADC
234  * @wm831x: Device to read from.
235  * @input: AUXADC input to read.
239 	return wm831x->auxadc_read(wm831x, input);  in wm831x_auxadc_read()
244  * wm831x_auxadc_read_uv: Read a voltage from the WM831x AUXADC
246  * @wm831x: Device to read from.
247  * @input: AUXADC input to read.
267 	mutex_init(&wm831x->auxadc_lock);  in wm831x_auxadc_init()
268 	INIT_LIST_HEAD(&wm831x->auxadc_pending);  in wm831x_auxadc_init()
270 	if (wm831x->irq) {  in wm831x_auxadc_init()
271 		wm831x->auxadc_read = wm831x_auxadc_read_irq;  in wm831x_auxadc_init()
279 			dev_err(wm831x->dev, "AUXADC IRQ request failed: %d\n",  in wm831x_auxadc_init()
281 			wm831x->auxadc_read = NULL;  in wm831x_auxadc_init()
285 	if (!wm831x->auxadc_read)  in wm831x_auxadc_init()
286 		wm831x->auxadc_read = wm831x_auxadc_read_polled;  in wm831x_auxadc_init()