Linux kernel mirror (for testing)
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linux
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");