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2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c 
 kernel/drivers/iio/adc/imx7d_adc.c
....@@ -1,12 +1,8 @@
1
+// SPDX-License-Identifier: GPL-2.0-or-later
12 /*
23  * Freescale i.MX7D ADC driver
34  *
45  * Copyright (C) 2015 Freescale Semiconductor, Inc.
5
- *
6
- * This program is free software; you can redistribute it and/or modify
7
- * it under the terms of the GNU General Public License as published by
8
- * the Free Software Foundation; either version 2 of the License, or
9
- * (at your option) any later version.
106  */
117 
128 #include <linux/clk.h>
....@@ -82,6 +78,7 @@
8278 #define IMX7D_REG_ADC_INT_STATUS_CHANNEL_CONV_TIME_OUT		0xf0000
8379 
8480 #define IMX7D_ADC_TIMEOUT		msecs_to_jiffies(100)
81
+#define IMX7D_ADC_INPUT_CLK		24000000
8582 
8683 enum imx7d_adc_clk_pre_div {
8784 	IMX7D_ADC_ANALOG_CLK_PRE_DIV_4,
....@@ -104,8 +101,6 @@
104101 	enum imx7d_adc_average_num avg_num;
105102 
106103 	u32 core_time_unit;	/* impact the sample rate */
107
-
108
-	bool average_en;
109104 };
110105 
111106 struct imx7d_adc {
....@@ -183,7 +178,6 @@
183178 	info->adc_feature.clk_pre_div = IMX7D_ADC_ANALOG_CLK_PRE_DIV_4;
184179 	info->adc_feature.avg_num = IMX7D_ADC_AVERAGE_NUM_32;
185180 	info->adc_feature.core_time_unit = 1;
186
-	info->adc_feature.average_en = true;
187181 }
188182 
189183 static void imx7d_adc_sample_rate_set(struct imx7d_adc *info)
....@@ -244,9 +238,8 @@
244238 
245239 	/* the channel choose single conversion, and enable average mode */
246240 	cfg1 |= (IMX7D_REG_ADC_CH_CFG1_CHANNEL_EN |
247
-		 IMX7D_REG_ADC_CH_CFG1_CHANNEL_SINGLE);
248
-	if (info->adc_feature.average_en)
249
-		cfg1 |= IMX7D_REG_ADC_CH_CFG1_CHANNEL_AVG_EN;
241
+		 IMX7D_REG_ADC_CH_CFG1_CHANNEL_SINGLE |
242
+		 IMX7D_REG_ADC_CH_CFG1_CHANNEL_AVG_EN);
250243 
251244 	/*
252245 	 * physical channel 0 chose logical channel A
....@@ -276,13 +269,11 @@
276269 
277270 static u32 imx7d_adc_get_sample_rate(struct imx7d_adc *info)
278271 {
279
-	/* input clock is always 24MHz */
280
-	u32 input_clk = 24000000;
281272 	u32 analogue_core_clk;
282273 	u32 core_time_unit = info->adc_feature.core_time_unit;
283274 	u32 tmp;
284275 
285
-	analogue_core_clk = input_clk / info->pre_div_num;
276
+	analogue_core_clk = IMX7D_ADC_INPUT_CLK / info->pre_div_num;
286277 	tmp = (core_time_unit + 1) * 6;
287278 
288279 	return analogue_core_clk / tmp;
....@@ -388,8 +379,9 @@
388379 	 * timeout flags.
389380 	 */
390381 	if (status & IMX7D_REG_ADC_INT_STATUS_CHANNEL_CONV_TIME_OUT) {
391
-		pr_err("%s: ADC got conversion time out interrupt: 0x%08x\n",
392
-			dev_name(info->dev), status);
382
+		dev_err(info->dev,
383
+			"ADC got conversion time out interrupt: 0x%08x\n",
384
+			status);
393385 		status &= ~IMX7D_REG_ADC_INT_STATUS_CHANNEL_CONV_TIME_OUT;
394386 		writel(status, info->regs + IMX7D_REG_ADC_INT_STATUS);
395387 	}
....@@ -433,136 +425,7 @@
433425 	writel(adc_cfg, info->regs + IMX7D_REG_ADC_ADC_CFG);
434426 }
435427 
436
-static int imx7d_adc_probe(struct platform_device *pdev)
437
-{
438
-	struct imx7d_adc *info;
439
-	struct iio_dev *indio_dev;
440
-	struct resource *mem;
441
-	int irq;
442
-	int ret;
443
-
444
-	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*info));
445
-	if (!indio_dev) {
446
-		dev_err(&pdev->dev, "Failed allocating iio device\n");
447
-		return -ENOMEM;
448
-	}
449
-
450
-	info = iio_priv(indio_dev);
451
-	info->dev = &pdev->dev;
452
-
453
-	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
454
-	info->regs = devm_ioremap_resource(&pdev->dev, mem);
455
-	if (IS_ERR(info->regs)) {
456
-		ret = PTR_ERR(info->regs);
457
-		dev_err(&pdev->dev,
458
-			"Failed to remap adc memory, err = %d\n", ret);
459
-		return ret;
460
-	}
461
-
462
-	irq = platform_get_irq(pdev, 0);
463
-	if (irq < 0) {
464
-		dev_err(&pdev->dev, "No irq resource?\n");
465
-		return irq;
466
-	}
467
-
468
-	info->clk = devm_clk_get(&pdev->dev, "adc");
469
-	if (IS_ERR(info->clk)) {
470
-		ret = PTR_ERR(info->clk);
471
-		dev_err(&pdev->dev, "Failed getting clock, err = %d\n", ret);
472
-		return ret;
473
-	}
474
-
475
-	info->vref = devm_regulator_get(&pdev->dev, "vref");
476
-	if (IS_ERR(info->vref)) {
477
-		ret = PTR_ERR(info->vref);
478
-		dev_err(&pdev->dev,
479
-			"Failed getting reference voltage, err = %d\n", ret);
480
-		return ret;
481
-	}
482
-
483
-	ret = regulator_enable(info->vref);
484
-	if (ret) {
485
-		dev_err(&pdev->dev,
486
-			"Can't enable adc reference top voltage, err = %d\n",
487
-			ret);
488
-		return ret;
489
-	}
490
-
491
-	platform_set_drvdata(pdev, indio_dev);
492
-
493
-	init_completion(&info->completion);
494
-
495
-	indio_dev->name = dev_name(&pdev->dev);
496
-	indio_dev->dev.parent = &pdev->dev;
497
-	indio_dev->info = &imx7d_adc_iio_info;
498
-	indio_dev->modes = INDIO_DIRECT_MODE;
499
-	indio_dev->channels = imx7d_adc_iio_channels;
500
-	indio_dev->num_channels = ARRAY_SIZE(imx7d_adc_iio_channels);
501
-
502
-	ret = clk_prepare_enable(info->clk);
503
-	if (ret) {
504
-		dev_err(&pdev->dev,
505
-			"Could not prepare or enable the clock.\n");
506
-		goto error_adc_clk_enable;
507
-	}
508
-
509
-	ret = devm_request_irq(info->dev, irq,
510
-				imx7d_adc_isr, 0,
511
-				dev_name(&pdev->dev), info);
512
-	if (ret < 0) {
513
-		dev_err(&pdev->dev, "Failed requesting irq, irq = %d\n", irq);
514
-		goto error_iio_device_register;
515
-	}
516
-
517
-	imx7d_adc_feature_config(info);
518
-	imx7d_adc_hw_init(info);
519
-
520
-	ret = iio_device_register(indio_dev);
521
-	if (ret) {
522
-		imx7d_adc_power_down(info);
523
-		dev_err(&pdev->dev, "Couldn't register the device.\n");
524
-		goto error_iio_device_register;
525
-	}
526
-
527
-	return 0;
528
-
529
-error_iio_device_register:
530
-	clk_disable_unprepare(info->clk);
531
-error_adc_clk_enable:
532
-	regulator_disable(info->vref);
533
-
534
-	return ret;
535
-}
536
-
537
-static int imx7d_adc_remove(struct platform_device *pdev)
538
-{
539
-	struct iio_dev *indio_dev = platform_get_drvdata(pdev);
540
-	struct imx7d_adc *info = iio_priv(indio_dev);
541
-
542
-	iio_device_unregister(indio_dev);
543
-
544
-	imx7d_adc_power_down(info);
545
-
546
-	clk_disable_unprepare(info->clk);
547
-	regulator_disable(info->vref);
548
-
549
-	return 0;
550
-}
551
-
552
-static int __maybe_unused imx7d_adc_suspend(struct device *dev)
553
-{
554
-	struct iio_dev *indio_dev = dev_get_drvdata(dev);
555
-	struct imx7d_adc *info = iio_priv(indio_dev);
556
-
557
-	imx7d_adc_power_down(info);
558
-
559
-	clk_disable_unprepare(info->clk);
560
-	regulator_disable(info->vref);
561
-
562
-	return 0;
563
-}
564
-
565
-static int __maybe_unused imx7d_adc_resume(struct device *dev)
428
+static int imx7d_adc_enable(struct device *dev)
566429 {
567430 	struct iio_dev *indio_dev = dev_get_drvdata(dev);
568431 	struct imx7d_adc *info = iio_priv(indio_dev);
....@@ -589,11 +452,104 @@
589452 	return 0;
590453 }
591454 
592
-static SIMPLE_DEV_PM_OPS(imx7d_adc_pm_ops, imx7d_adc_suspend, imx7d_adc_resume);
455
+static int imx7d_adc_disable(struct device *dev)
456
+{
457
+	struct iio_dev *indio_dev = dev_get_drvdata(dev);
458
+	struct imx7d_adc *info = iio_priv(indio_dev);
459
+
460
+	imx7d_adc_power_down(info);
461
+
462
+	clk_disable_unprepare(info->clk);
463
+	regulator_disable(info->vref);
464
+
465
+	return 0;
466
+}
467
+
468
+static void __imx7d_adc_disable(void *data)
469
+{
470
+	imx7d_adc_disable(data);
471
+}
472
+
473
+static int imx7d_adc_probe(struct platform_device *pdev)
474
+{
475
+	struct imx7d_adc *info;
476
+	struct iio_dev *indio_dev;
477
+	struct device *dev = &pdev->dev;
478
+	int irq;
479
+	int ret;
480
+
481
+	indio_dev = devm_iio_device_alloc(dev, sizeof(*info));
482
+	if (!indio_dev) {
483
+		dev_err(&pdev->dev, "Failed allocating iio device\n");
484
+		return -ENOMEM;
485
+	}
486
+
487
+	info = iio_priv(indio_dev);
488
+	info->dev = dev;
489
+
490
+	info->regs = devm_platform_ioremap_resource(pdev, 0);
491
+	if (IS_ERR(info->regs))
492
+		return PTR_ERR(info->regs);
493
+
494
+	irq = platform_get_irq(pdev, 0);
495
+	if (irq < 0)
496
+		return irq;
497
+
498
+	info->clk = devm_clk_get(dev, "adc");
499
+	if (IS_ERR(info->clk)) {
500
+		ret = PTR_ERR(info->clk);
501
+		dev_err(dev, "Failed getting clock, err = %d\n", ret);
502
+		return ret;
503
+	}
504
+
505
+	info->vref = devm_regulator_get(dev, "vref");
506
+	if (IS_ERR(info->vref)) {
507
+		ret = PTR_ERR(info->vref);
508
+		dev_err(dev,
509
+			"Failed getting reference voltage, err = %d\n", ret);
510
+		return ret;
511
+	}
512
+
513
+	platform_set_drvdata(pdev, indio_dev);
514
+
515
+	init_completion(&info->completion);
516
+
517
+	indio_dev->name = dev_name(dev);
518
+	indio_dev->info = &imx7d_adc_iio_info;
519
+	indio_dev->modes = INDIO_DIRECT_MODE;
520
+	indio_dev->channels = imx7d_adc_iio_channels;
521
+	indio_dev->num_channels = ARRAY_SIZE(imx7d_adc_iio_channels);
522
+
523
+	ret = devm_request_irq(dev, irq, imx7d_adc_isr, 0, dev_name(dev), info);
524
+	if (ret < 0) {
525
+		dev_err(dev, "Failed requesting irq, irq = %d\n", irq);
526
+		return ret;
527
+	}
528
+
529
+	imx7d_adc_feature_config(info);
530
+
531
+	ret = imx7d_adc_enable(&indio_dev->dev);
532
+	if (ret)
533
+		return ret;
534
+
535
+	ret = devm_add_action_or_reset(dev, __imx7d_adc_disable,
536
+				       &indio_dev->dev);
537
+	if (ret)
538
+		return ret;
539
+
540
+	ret = devm_iio_device_register(dev, indio_dev);
541
+	if (ret) {
542
+		dev_err(&pdev->dev, "Couldn't register the device.\n");
543
+		return ret;
544
+	}
545
+
546
+	return 0;
547
+}
548
+
549
+static SIMPLE_DEV_PM_OPS(imx7d_adc_pm_ops, imx7d_adc_disable, imx7d_adc_enable);
593550 
594551 static struct platform_driver imx7d_adc_driver = {
595552 	.probe		= imx7d_adc_probe,
596
-	.remove		= imx7d_adc_remove,
597553 	.driver		= {
598554 		.name	= "imx7d_adc",
599555 		.of_match_table = imx7d_adc_match,