sun4i-gpadc.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2/* ADC MFD core driver for sunxi platforms
  3 *
  4 * Copyright (c) 2016 Quentin Schulz <quentin.schulz@free-electrons.com>
  5 */
  6
  7#include <linux/interrupt.h>
  8#include <linux/kernel.h>
  9#include <linux/mfd/core.h>
 10#include <linux/module.h>
 11#include <linux/of.h>
 12#include <linux/platform_device.h>
 13#include <linux/regmap.h>
 14
 15#include <linux/mfd/sun4i-gpadc.h>
 16
 17#define ARCH_SUN4I_A10 0
 18#define ARCH_SUN5I_A13 1
 19#define ARCH_SUN6I_A31 2
 20
 21static const struct resource adc_resources[] = {
 22	DEFINE_RES_IRQ_NAMED(SUN4I_GPADC_IRQ_FIFO_DATA, "FIFO_DATA_PENDING"),
 23	DEFINE_RES_IRQ_NAMED(SUN4I_GPADC_IRQ_TEMP_DATA, "TEMP_DATA_PENDING"),
 24};
 25
 26static const struct regmap_irq sun4i_gpadc_regmap_irq[] = {
 27	REGMAP_IRQ_REG(SUN4I_GPADC_IRQ_FIFO_DATA, 0,
 28		       SUN4I_GPADC_INT_FIFOC_TP_DATA_IRQ_EN),
 29	REGMAP_IRQ_REG(SUN4I_GPADC_IRQ_TEMP_DATA, 0,
 30		       SUN4I_GPADC_INT_FIFOC_TEMP_IRQ_EN),
 31};
 32
 33static const struct regmap_irq_chip sun4i_gpadc_regmap_irq_chip = {
 34	.name = "sun4i_gpadc_irq_chip",
 35	.status_base = SUN4I_GPADC_INT_FIFOS,
 36	.ack_base = SUN4I_GPADC_INT_FIFOS,
 37	.unmask_base = SUN4I_GPADC_INT_FIFOC,
 38	.init_ack_masked = true,
 39	.irqs = sun4i_gpadc_regmap_irq,
 40	.num_irqs = ARRAY_SIZE(sun4i_gpadc_regmap_irq),
 41	.num_regs = 1,
 42};
 43
 44static struct mfd_cell sun4i_gpadc_cells[] = {
 45	{
 46		.name	= "sun4i-a10-gpadc-iio",
 47		.resources = adc_resources,
 48		.num_resources = ARRAY_SIZE(adc_resources),
 49	},
 50	{ .name = "iio_hwmon" }
 51};
 52
 53static struct mfd_cell sun5i_gpadc_cells[] = {
 54	{
 55		.name	= "sun5i-a13-gpadc-iio",
 56		.resources = adc_resources,
 57		.num_resources = ARRAY_SIZE(adc_resources),
 58	},
 59	{ .name = "iio_hwmon" },
 60};
 61
 62static struct mfd_cell sun6i_gpadc_cells[] = {
 63	{
 64		.name	= "sun6i-a31-gpadc-iio",
 65		.resources = adc_resources,
 66		.num_resources = ARRAY_SIZE(adc_resources),
 67	},
 68	{ .name = "iio_hwmon" },
 69};
 70
 71static const struct regmap_config sun4i_gpadc_regmap_config = {
 72	.reg_bits = 32,
 73	.val_bits = 32,
 74	.reg_stride = 4,
 75};
 76
 77static const struct of_device_id sun4i_gpadc_of_match[] = {
 78	{
 79		.compatible = "allwinner,sun4i-a10-ts",
 80		.data = (void *)ARCH_SUN4I_A10,
 81	}, {
 82		.compatible = "allwinner,sun5i-a13-ts",
 83		.data = (void *)ARCH_SUN5I_A13,
 84	}, {
 85		.compatible = "allwinner,sun6i-a31-ts",
 86		.data = (void *)ARCH_SUN6I_A31,
 87	}, { /* sentinel */ }
 88};
 89
 90MODULE_DEVICE_TABLE(of, sun4i_gpadc_of_match);
 91
 92static int sun4i_gpadc_probe(struct platform_device *pdev)
 93{
 94	struct sun4i_gpadc_dev *dev;
 95	const struct of_device_id *of_id;
 96	const struct mfd_cell *cells;
 97	unsigned int irq, size;
 98	int ret;
 99
100	of_id = of_match_node(sun4i_gpadc_of_match, pdev->dev.of_node);
101	if (!of_id)
102		return -EINVAL;
103
104	switch ((long)of_id->data) {
105	case ARCH_SUN4I_A10:
106		cells = sun4i_gpadc_cells;
107		size = ARRAY_SIZE(sun4i_gpadc_cells);
108		break;
109	case ARCH_SUN5I_A13:
110		cells = sun5i_gpadc_cells;
111		size = ARRAY_SIZE(sun5i_gpadc_cells);
112		break;
113	case ARCH_SUN6I_A31:
114		cells = sun6i_gpadc_cells;
115		size = ARRAY_SIZE(sun6i_gpadc_cells);
116		break;
117	default:
118		return -EINVAL;
119	}
120
121	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
122	if (!dev)
123		return -ENOMEM;
124
125	dev->base = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
126	if (IS_ERR(dev->base))
127		return PTR_ERR(dev->base);
128
129	dev->dev = &pdev->dev;
130	dev_set_drvdata(dev->dev, dev);
131
132	dev->regmap = devm_regmap_init_mmio(dev->dev, dev->base,
133					    &sun4i_gpadc_regmap_config);
134	if (IS_ERR(dev->regmap)) {
135		ret = PTR_ERR(dev->regmap);
136		dev_err(&pdev->dev, "failed to init regmap: %d\n", ret);
137		return ret;
138	}
139
140	/* Disable all interrupts */
141	regmap_write(dev->regmap, SUN4I_GPADC_INT_FIFOC, 0);
142
143	irq = platform_get_irq(pdev, 0);
144	ret = devm_regmap_add_irq_chip(&pdev->dev, dev->regmap, irq,
145				       IRQF_ONESHOT, 0,
146				       &sun4i_gpadc_regmap_irq_chip,
147				       &dev->regmap_irqc);
148	if (ret) {
149		dev_err(&pdev->dev, "failed to add irq chip: %d\n", ret);
150		return ret;
151	}
152
153	ret = devm_mfd_add_devices(dev->dev, 0, cells, size, NULL, 0, NULL);
154	if (ret) {
155		dev_err(&pdev->dev, "failed to add MFD devices: %d\n", ret);
156		return ret;
157	}
158
159	return 0;
160}
161
162static struct platform_driver sun4i_gpadc_driver = {
163	.driver = {
164		.name = "sun4i-gpadc",
165		.of_match_table = sun4i_gpadc_of_match,
166	},
167	.probe = sun4i_gpadc_probe,
168};
169
170module_platform_driver(sun4i_gpadc_driver);
171
172MODULE_DESCRIPTION("Allwinner sunxi platforms' GPADC MFD core driver");
173MODULE_AUTHOR("Quentin Schulz <quentin.schulz@free-electrons.com>");
174MODULE_LICENSE("GPL v2");