2  * wm831x-auxadc.c  --  AUXADC for Wolfson WM831x PMICs
4  * Copyright 2009-2011 Wolfson Microelectronics PLC.
31 	enum wm831x_auxadc input;  member
37 				  enum wm831x_auxadc input)  in wm831x_auxadc_read_irq()  argument
45 		return -ENOMEM;  in wm831x_auxadc_read_irq()
47 	init_completion(&req->done);  in wm831x_auxadc_read_irq()
48 	req->input = input;  in wm831x_auxadc_read_irq()
49 	req->val = -ETIMEDOUT;  in wm831x_auxadc_read_irq()
51 	mutex_lock(&wm831x->auxadc_lock);  in wm831x_auxadc_read_irq()
54 	list_add(&req->list, &wm831x->auxadc_pending);  in wm831x_auxadc_read_irq()
56 	ena = !wm831x->auxadc_active;  in wm831x_auxadc_read_irq()
62 			dev_err(wm831x->dev, "Failed to enable AUXADC: %d\n",  in wm831x_auxadc_read_irq()
69 	if (!(wm831x->auxadc_active & (1 << input))) {  in wm831x_auxadc_read_irq()
71 				      1 << input, 1 << input);  in wm831x_auxadc_read_irq()
73 			dev_err(wm831x->dev,  in wm831x_auxadc_read_irq()
78 		wm831x->auxadc_active |= 1 << input;  in wm831x_auxadc_read_irq()
89 			dev_err(wm831x->dev, "Failed to start AUXADC: %d\n",  in wm831x_auxadc_read_irq()
95 	mutex_unlock(&wm831x->auxadc_lock);  in wm831x_auxadc_read_irq()
98 	wait_for_completion_timeout(&req->done, msecs_to_jiffies(500));  in wm831x_auxadc_read_irq()
100 	mutex_lock(&wm831x->auxadc_lock);  in wm831x_auxadc_read_irq()
102 	list_del(&req->list);  in wm831x_auxadc_read_irq()
103 	ret = req->val;  in wm831x_auxadc_read_irq()
106 	mutex_unlock(&wm831x->auxadc_lock);  in wm831x_auxadc_read_irq()
117 	int ret, input, val;  in wm831x_auxadc_irq()  local
121 		dev_err(wm831x->dev,  in wm831x_auxadc_irq()
126 	input = ((ret & WM831X_AUX_DATA_SRC_MASK)  in wm831x_auxadc_irq()
127 		 >> WM831X_AUX_DATA_SRC_SHIFT) - 1;  in wm831x_auxadc_irq()
129 	if (input == 14)  in wm831x_auxadc_irq()
130 		input = WM831X_AUX_CAL;  in wm831x_auxadc_irq()
134 	mutex_lock(&wm831x->auxadc_lock);  in wm831x_auxadc_irq()
136 	/* Disable this conversion, we're about to complete all users */  in wm831x_auxadc_irq()
138 			1 << input, 0);  in wm831x_auxadc_irq()
139 	wm831x->auxadc_active &= ~(1 << input);  in wm831x_auxadc_irq()
142 	if (!wm831x->auxadc_active)  in wm831x_auxadc_irq()
146 	list_for_each_entry(req, &wm831x->auxadc_pending, list) {  in wm831x_auxadc_irq()
147 		if (req->input == input) {  in wm831x_auxadc_irq()
148 			req->val = val;  in wm831x_auxadc_irq()
149 			complete(&req->done);  in wm831x_auxadc_irq()
153 	mutex_unlock(&wm831x->auxadc_lock);  in wm831x_auxadc_irq()
159 				     enum wm831x_auxadc input)  in wm831x_auxadc_read_polled()  argument
163 	mutex_lock(&wm831x->auxadc_lock);  in wm831x_auxadc_read_polled()
168 		dev_err(wm831x->dev, "Failed to enable AUXADC: %d\n", ret);  in wm831x_auxadc_read_polled()
173 	src = input;  in wm831x_auxadc_read_polled()
177 		dev_err(wm831x->dev, "Failed to set AUXADC source: %d\n", ret);  in wm831x_auxadc_read_polled()
184 		dev_err(wm831x->dev, "Failed to start AUXADC: %d\n", ret);  in wm831x_auxadc_read_polled()
185 		goto disable;  in wm831x_auxadc_read_polled()
197 			dev_err(wm831x->dev,  in wm831x_auxadc_read_polled()
199 			goto disable;  in wm831x_auxadc_read_polled()
209 			dev_err(wm831x->dev,  in wm831x_auxadc_read_polled()
211 			ret = -EBUSY;  in wm831x_auxadc_read_polled()
212 			goto disable;  in wm831x_auxadc_read_polled()
218 		dev_err(wm831x->dev,  in wm831x_auxadc_read_polled()
220 		goto disable;  in wm831x_auxadc_read_polled()
224 	       >> WM831X_AUX_DATA_SRC_SHIFT) - 1;  in wm831x_auxadc_read_polled()
229 	if (src != input) {  in wm831x_auxadc_read_polled()
230 		dev_err(wm831x->dev, "Data from source %d not %d\n",  in wm831x_auxadc_read_polled()
231 			src, input);  in wm831x_auxadc_read_polled()
232 		ret = -EINVAL;  in wm831x_auxadc_read_polled()
237 disable:  in wm831x_auxadc_read_polled()
240 	mutex_unlock(&wm831x->auxadc_lock);  in wm831x_auxadc_read_polled()
248  * @input: AUXADC input to read.
250 int wm831x_auxadc_read(struct wm831x *wm831x, enum wm831x_auxadc input)  in wm831x_auxadc_read()  argument
252 	return wm831x->auxadc_read(wm831x, input);  in wm831x_auxadc_read()
260  * @input: AUXADC input to read.
262 int wm831x_auxadc_read_uv(struct wm831x *wm831x, enum wm831x_auxadc input)  in wm831x_auxadc_read_uv()  argument
266 	ret = wm831x_auxadc_read(wm831x, input);  in wm831x_auxadc_read_uv()
280 	mutex_init(&wm831x->auxadc_lock);  in wm831x_auxadc_init()
281 	INIT_LIST_HEAD(&wm831x->auxadc_pending);  in wm831x_auxadc_init()
283 	if (wm831x->irq) {  in wm831x_auxadc_init()
284 		wm831x->auxadc_read = wm831x_auxadc_read_irq;  in wm831x_auxadc_init()
292 			dev_err(wm831x->dev, "AUXADC IRQ request failed: %d\n",  in wm831x_auxadc_init()
294 			wm831x->auxadc_read = NULL;  in wm831x_auxadc_init()
298 	if (!wm831x->auxadc_read)  in wm831x_auxadc_init()
299 		wm831x->auxadc_read = wm831x_auxadc_read_polled;  in wm831x_auxadc_init()