GNU Linux-libre 5.10.219-gnu1
[releases.git] / drivers / mfd / 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_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
21 static 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
26 static 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
33 static 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
45 static 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
54 static 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
63 static 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
72 static 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
79 static 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         }, { /* sentinel */ }
90 };
91
92 MODULE_DEVICE_TABLE(of, sun4i_gpadc_of_match);
93
94 static 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         /* Disable all interrupts */
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
166 static 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
174 module_platform_driver(sun4i_gpadc_driver);
175
176 MODULE_DESCRIPTION("Allwinner sunxi platforms' GPADC MFD core driver");
177 MODULE_AUTHOR("Quentin Schulz <quentin.schulz@free-electrons.com>");
178 MODULE_LICENSE("GPL v2");