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.
26 	enum wm831x_auxadc input;  member
32 				  enum wm831x_auxadc input)  in wm831x_auxadc_read_irq()  argument
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()
64 	if (!(wm831x->auxadc_active & (1 << input))) {  in wm831x_auxadc_read_irq()
66 				      1 << input, 1 << input);  in wm831x_auxadc_read_irq()
68 			dev_err(wm831x->dev,  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()
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()
97 	list_del(&req->list);  in wm831x_auxadc_read_irq()
98 	ret = req->val;  in wm831x_auxadc_read_irq()
101 	mutex_unlock(&wm831x->auxadc_lock);  in wm831x_auxadc_read_irq()
112 	int ret, input, val;  in wm831x_auxadc_irq()  local
116 		dev_err(wm831x->dev,  in wm831x_auxadc_irq()
121 	input = ((ret & WM831X_AUX_DATA_SRC_MASK)  in wm831x_auxadc_irq()
122 		 >> WM831X_AUX_DATA_SRC_SHIFT) - 1;  in wm831x_auxadc_irq()
124 	if (input == 14)  in wm831x_auxadc_irq()
125 		input = WM831X_AUX_CAL;  in wm831x_auxadc_irq()
129 	mutex_lock(&wm831x->auxadc_lock);  in wm831x_auxadc_irq()
131 	/* Disable this conversion, we're about to complete all users */  in wm831x_auxadc_irq()
133 			1 << input, 0);  in wm831x_auxadc_irq()
134 	wm831x->auxadc_active &= ~(1 << input);  in wm831x_auxadc_irq()
137 	if (!wm831x->auxadc_active)  in wm831x_auxadc_irq()
141 	list_for_each_entry(req, &wm831x->auxadc_pending, list) {  in wm831x_auxadc_irq()
142 		if (req->input == input) {  in wm831x_auxadc_irq()
143 			req->val = val;  in wm831x_auxadc_irq()
144 			complete(&req->done);  in wm831x_auxadc_irq()
148 	mutex_unlock(&wm831x->auxadc_lock);  in wm831x_auxadc_irq()
154 				     enum wm831x_auxadc input)  in wm831x_auxadc_read_polled()  argument
158 	mutex_lock(&wm831x->auxadc_lock);  in wm831x_auxadc_read_polled()
163 		dev_err(wm831x->dev, "Failed to enable AUXADC: %d\n", ret);  in wm831x_auxadc_read_polled()
168 	src = input;  in wm831x_auxadc_read_polled()
172 		dev_err(wm831x->dev, "Failed to set AUXADC source: %d\n", ret);  in wm831x_auxadc_read_polled()
179 		dev_err(wm831x->dev, "Failed to start AUXADC: %d\n", ret);  in wm831x_auxadc_read_polled()
180 		goto disable;  in wm831x_auxadc_read_polled()
192 			dev_err(wm831x->dev,  in wm831x_auxadc_read_polled()
194 			goto disable;  in wm831x_auxadc_read_polled()
204 			dev_err(wm831x->dev,  in wm831x_auxadc_read_polled()
206 			ret = -EBUSY;  in wm831x_auxadc_read_polled()
207 			goto disable;  in wm831x_auxadc_read_polled()
213 		dev_err(wm831x->dev,  in wm831x_auxadc_read_polled()
215 		goto disable;  in wm831x_auxadc_read_polled()
219 	       >> WM831X_AUX_DATA_SRC_SHIFT) - 1;  in wm831x_auxadc_read_polled()
224 	if (src != input) {  in wm831x_auxadc_read_polled()
225 		dev_err(wm831x->dev, "Data from source %d not %d\n",  in wm831x_auxadc_read_polled()
226 			src, input);  in wm831x_auxadc_read_polled()
227 		ret = -EINVAL;  in wm831x_auxadc_read_polled()
232 disable:  in wm831x_auxadc_read_polled()
235 	mutex_unlock(&wm831x->auxadc_lock);  in wm831x_auxadc_read_polled()
243  * @input: AUXADC input to read.
245 int wm831x_auxadc_read(struct wm831x *wm831x, enum wm831x_auxadc input)  in wm831x_auxadc_read()  argument
247 	return wm831x->auxadc_read(wm831x, input);  in wm831x_auxadc_read()
255  * @input: AUXADC input to read.
257 int wm831x_auxadc_read_uv(struct wm831x *wm831x, enum wm831x_auxadc input)  in wm831x_auxadc_read_uv()  argument
261 	ret = wm831x_auxadc_read(wm831x, input);  in wm831x_auxadc_read_uv()
275 	mutex_init(&wm831x->auxadc_lock);  in wm831x_auxadc_init()
276 	INIT_LIST_HEAD(&wm831x->auxadc_pending);  in wm831x_auxadc_init()
278 	if (wm831x->irq) {  in wm831x_auxadc_init()
279 		wm831x->auxadc_read = wm831x_auxadc_read_irq;  in wm831x_auxadc_init()
287 			dev_err(wm831x->dev, "AUXADC IRQ request failed: %d\n",  in wm831x_auxadc_init()
289 			wm831x->auxadc_read = NULL;  in wm831x_auxadc_init()
293 	if (!wm831x->auxadc_read)  in wm831x_auxadc_init()
294 		wm831x->auxadc_read = wm831x_auxadc_read_polled;  in wm831x_auxadc_init()