1
2
3
4
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_device.h>
12#include <linux/of_irq.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 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 .mask_base = SUN4I_GPADC_INT_FIFOC,
38 .init_ack_masked = true,
39 .mask_invert = true,
40 .irqs = sun4i_gpadc_regmap_irq,
41 .num_irqs = ARRAY_SIZE(sun4i_gpadc_regmap_irq),
42 .num_regs = 1,
43};
44
45static struct mfd_cell sun4i_gpadc_cells[] = {
46 {
47 .name = "sun4i-a10-gpadc-iio",
48 .resources = adc_resources,
49 .num_resources = ARRAY_SIZE(adc_resources),
50 },
51 { .name = "iio_hwmon" }
52};
53
54static struct mfd_cell sun5i_gpadc_cells[] = {
55 {
56 .name = "sun5i-a13-gpadc-iio",
57 .resources = adc_resources,
58 .num_resources = ARRAY_SIZE(adc_resources),
59 },
60 { .name = "iio_hwmon" },
61};
62
63static struct mfd_cell sun6i_gpadc_cells[] = {
64 {
65 .name = "sun6i-a31-gpadc-iio",
66 .resources = adc_resources,
67 .num_resources = ARRAY_SIZE(adc_resources),
68 },
69 { .name = "iio_hwmon" },
70};
71
72static const struct regmap_config sun4i_gpadc_regmap_config = {
73 .reg_bits = 32,
74 .val_bits = 32,
75 .reg_stride = 4,
76 .fast_io = true,
77};
78
79static const struct of_device_id sun4i_gpadc_of_match[] = {
80 {
81 .compatible = "allwinner,sun4i-a10-ts",
82 .data = (void *)ARCH_SUN4I_A10,
83 }, {
84 .compatible = "allwinner,sun5i-a13-ts",
85 .data = (void *)ARCH_SUN5I_A13,
86 }, {
87 .compatible = "allwinner,sun6i-a31-ts",
88 .data = (void *)ARCH_SUN6I_A31,
89 }, { }
90};
91
92MODULE_DEVICE_TABLE(of, sun4i_gpadc_of_match);
93
94static int sun4i_gpadc_probe(struct platform_device *pdev)
95{
96 struct sun4i_gpadc_dev *dev;
97 struct resource *mem;
98 const struct of_device_id *of_id;
99 const struct mfd_cell *cells;
100 unsigned int irq, size;
101 int ret;
102
103 of_id = of_match_node(sun4i_gpadc_of_match, pdev->dev.of_node);
104 if (!of_id)
105 return -EINVAL;
106
107 switch ((long)of_id->data) {
108 case ARCH_SUN4I_A10:
109 cells = sun4i_gpadc_cells;
110 size = ARRAY_SIZE(sun4i_gpadc_cells);
111 break;
112 case ARCH_SUN5I_A13:
113 cells = sun5i_gpadc_cells;
114 size = ARRAY_SIZE(sun5i_gpadc_cells);
115 break;
116 case ARCH_SUN6I_A31:
117 cells = sun6i_gpadc_cells;
118 size = ARRAY_SIZE(sun6i_gpadc_cells);
119 break;
120 default:
121 return -EINVAL;
122 }
123
124 dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
125 if (!dev)
126 return -ENOMEM;
127
128 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
129 dev->base = devm_ioremap_resource(&pdev->dev, mem);
130 if (IS_ERR(dev->base))
131 return PTR_ERR(dev->base);
132
133 dev->dev = &pdev->dev;
134 dev_set_drvdata(dev->dev, dev);
135
136 dev->regmap = devm_regmap_init_mmio(dev->dev, dev->base,
137 &sun4i_gpadc_regmap_config);
138 if (IS_ERR(dev->regmap)) {
139 ret = PTR_ERR(dev->regmap);
140 dev_err(&pdev->dev, "failed to init regmap: %d\n", ret);
141 return ret;
142 }
143
144
145 regmap_write(dev->regmap, SUN4I_GPADC_INT_FIFOC, 0);
146
147 irq = platform_get_irq(pdev, 0);
148 ret = devm_regmap_add_irq_chip(&pdev->dev, dev->regmap, irq,
149 IRQF_ONESHOT, 0,
150 &sun4i_gpadc_regmap_irq_chip,
151 &dev->regmap_irqc);
152 if (ret) {
153 dev_err(&pdev->dev, "failed to add irq chip: %d\n", ret);
154 return ret;
155 }
156
157 ret = devm_mfd_add_devices(dev->dev, 0, cells, size, NULL, 0, NULL);
158 if (ret) {
159 dev_err(&pdev->dev, "failed to add MFD devices: %d\n", ret);
160 return ret;
161 }
162
163 return 0;
164}
165
166static struct platform_driver sun4i_gpadc_driver = {
167 .driver = {
168 .name = "sun4i-gpadc",
169 .of_match_table = of_match_ptr(sun4i_gpadc_of_match),
170 },
171 .probe = sun4i_gpadc_probe,
172};
173
174module_platform_driver(sun4i_gpadc_driver);
175
176MODULE_DESCRIPTION("Allwinner sunxi platforms' GPADC MFD core driver");
177MODULE_AUTHOR("Quentin Schulz <quentin.schulz@free-electrons.com>");
178MODULE_LICENSE("GPL v2");
179
