1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* NXP PCF50633 ADC Driver
4  * (C) 2006-2008 by Openmoko, Inc.
11  *  NOTE: This driver does not yet support subtractive ADC mode, which means
23 #include <linux/mfd/pcf50633/adc.h>
51 	return platform_get_drvdata(pcf->adc_pdev);  in __to_adc()
62 	/* start ADC conversion on selected channel */  in adc_setup()
69 	struct pcf50633_adc *adc = __to_adc(pcf);  in trigger_next_adc_job_if_any()  local
72 	head = adc->queue_head;  in trigger_next_adc_job_if_any()
74 	if (!adc->queue[head])  in trigger_next_adc_job_if_any()
77 	adc_setup(pcf, adc->queue[head]->mux, adc->queue[head]->avg);  in trigger_next_adc_job_if_any()
83 	struct pcf50633_adc *adc = __to_adc(pcf);  in adc_enqueue_request()  local
86 	mutex_lock(&adc->queue_mutex);  in adc_enqueue_request()
88 	head = adc->queue_head;  in adc_enqueue_request()
89 	tail = adc->queue_tail;  in adc_enqueue_request()
91 	if (adc->queue[tail]) {  in adc_enqueue_request()
92 		mutex_unlock(&adc->queue_mutex);  in adc_enqueue_request()
93 		dev_err(pcf->dev, "ADC queue is full, dropping request\n");  in adc_enqueue_request()
94 		return -EBUSY;  in adc_enqueue_request()
97 	adc->queue[tail] = req;  in adc_enqueue_request()
100 	adc->queue_tail = (tail + 1) & (PCF50633_MAX_ADC_FIFO_DEPTH - 1);  in adc_enqueue_request()
102 	mutex_unlock(&adc->queue_mutex);  in adc_enqueue_request()
112 	req->result = result;  in pcf50633_adc_sync_read_callback()
113 	complete(&req->completion);  in pcf50633_adc_sync_read_callback()
144 		return -ENOMEM;  in pcf50633_adc_async_read()
146 	req->mux = mux;  in pcf50633_adc_async_read()
147 	req->avg = avg;  in pcf50633_adc_async_read()
148 	req->callback = callback;  in pcf50633_adc_async_read()
149 	req->callback_param = callback_param;  in pcf50633_adc_async_read()
168 	dev_dbg(pcf->dev, "adc result = %d\n", result);  in adc_result()
175 	struct pcf50633_adc *adc = data;  in pcf50633_adc_irq()  local
176 	struct pcf50633 *pcf = adc->pcf;  in pcf50633_adc_irq()
180 	mutex_lock(&adc->queue_mutex);  in pcf50633_adc_irq()
181 	head = adc->queue_head;  in pcf50633_adc_irq()
183 	req = adc->queue[head];  in pcf50633_adc_irq()
185 		dev_err(pcf->dev, "pcf50633-adc irq: ADC queue empty!\n");  in pcf50633_adc_irq()
186 		mutex_unlock(&adc->queue_mutex);  in pcf50633_adc_irq()
189 	adc->queue[head] = NULL;  in pcf50633_adc_irq()
190 	adc->queue_head = (head + 1) &  in pcf50633_adc_irq()
191 				      (PCF50633_MAX_ADC_FIFO_DEPTH - 1);  in pcf50633_adc_irq()
196 	mutex_unlock(&adc->queue_mutex);  in pcf50633_adc_irq()
198 	req->callback(pcf, req->callback_param, res);  in pcf50633_adc_irq()
204 	struct pcf50633_adc *adc;  in pcf50633_adc_probe()  local
206 	adc = devm_kzalloc(&pdev->dev, sizeof(*adc), GFP_KERNEL);  in pcf50633_adc_probe()
207 	if (!adc)  in pcf50633_adc_probe()
208 		return -ENOMEM;  in pcf50633_adc_probe()
210 	adc->pcf = dev_to_pcf50633(pdev->dev.parent);  in pcf50633_adc_probe()
211 	platform_set_drvdata(pdev, adc);  in pcf50633_adc_probe()
213 	pcf50633_register_irq(adc->pcf, PCF50633_IRQ_ADCRDY,  in pcf50633_adc_probe()
214 					pcf50633_adc_irq, adc);  in pcf50633_adc_probe()
216 	mutex_init(&adc->queue_mutex);  in pcf50633_adc_probe()
223 	struct pcf50633_adc *adc = platform_get_drvdata(pdev);  in pcf50633_adc_remove()  local
226 	pcf50633_free_irq(adc->pcf, PCF50633_IRQ_ADCRDY);  in pcf50633_adc_remove()
228 	mutex_lock(&adc->queue_mutex);  in pcf50633_adc_remove()
229 	head = adc->queue_head;  in pcf50633_adc_remove()
231 	if (WARN_ON(adc->queue[head]))  in pcf50633_adc_remove()
232 		dev_err(adc->pcf->dev,  in pcf50633_adc_remove()
233 			"adc driver removed with request pending\n");  in pcf50633_adc_remove()
236 		kfree(adc->queue[i]);  in pcf50633_adc_remove()
238 	mutex_unlock(&adc->queue_mutex);  in pcf50633_adc_remove()
243 		.name = "pcf50633-adc",
252 MODULE_DESCRIPTION("PCF50633 adc driver");
254 MODULE_ALIAS("platform:pcf50633-adc");