1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
|
// SPDX-License-Identifier: GPL-2.0-only
/* ADC MFD core driver for sunxi platforms
*
* Copyright (c) 2016 Quentin Schulz <quentin.schulz@free-electrons.com>
*/
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/mfd/core.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/of_irq.h>
#include <linux/regmap.h>
#include <linux/mfd/sun4i-gpadc.h>
#define ARCH_SUN4I_A10 0
#define ARCH_SUN5I_A13 1
#define ARCH_SUN6I_A31 2
static struct resource adc_resources[] = {
DEFINE_RES_IRQ_NAMED(SUN4I_GPADC_IRQ_FIFO_DATA, "FIFO_DATA_PENDING"),
DEFINE_RES_IRQ_NAMED(SUN4I_GPADC_IRQ_TEMP_DATA, "TEMP_DATA_PENDING"),
};
static const struct regmap_irq sun4i_gpadc_regmap_irq[] = {
REGMAP_IRQ_REG(SUN4I_GPADC_IRQ_FIFO_DATA, 0,
SUN4I_GPADC_INT_FIFOC_TP_DATA_IRQ_EN),
REGMAP_IRQ_REG(SUN4I_GPADC_IRQ_TEMP_DATA, 0,
SUN4I_GPADC_INT_FIFOC_TEMP_IRQ_EN),
};
static const struct regmap_irq_chip sun4i_gpadc_regmap_irq_chip = {
.name = "sun4i_gpadc_irq_chip",
.status_base = SUN4I_GPADC_INT_FIFOS,
.ack_base = SUN4I_GPADC_INT_FIFOS,
.mask_base = SUN4I_GPADC_INT_FIFOC,
.init_ack_masked = true,
.mask_invert = true,
.irqs = sun4i_gpadc_regmap_irq,
.num_irqs = ARRAY_SIZE(sun4i_gpadc_regmap_irq),
.num_regs = 1,
};
static struct mfd_cell sun4i_gpadc_cells[] = {
{
.name = "sun4i-a10-gpadc-iio",
.resources = adc_resources,
.num_resources = ARRAY_SIZE(adc_resources),
},
{ .name = "iio_hwmon" }
};
static struct mfd_cell sun5i_gpadc_cells[] = {
{
.name = "sun5i-a13-gpadc-iio",
.resources = adc_resources,
.num_resources = ARRAY_SIZE(adc_resources),
},
{ .name = "iio_hwmon" },
};
static struct mfd_cell sun6i_gpadc_cells[] = {
{
.name = "sun6i-a31-gpadc-iio",
.resources = adc_resources,
.num_resources = ARRAY_SIZE(adc_resources),
},
{ .name = "iio_hwmon" },
};
static const struct regmap_config sun4i_gpadc_regmap_config = {
.reg_bits = 32,
.val_bits = 32,
.reg_stride = 4,
.fast_io = true,
};
static const struct of_device_id sun4i_gpadc_of_match[] = {
{
.compatible = "allwinner,sun4i-a10-ts",
.data = (void *)ARCH_SUN4I_A10,
}, {
.compatible = "allwinner,sun5i-a13-ts",
.data = (void *)ARCH_SUN5I_A13,
}, {
.compatible = "allwinner,sun6i-a31-ts",
.data = (void *)ARCH_SUN6I_A31,
}, { /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, sun4i_gpadc_of_match);
static int sun4i_gpadc_probe(struct platform_device *pdev)
{
struct sun4i_gpadc_dev *dev;
struct resource *mem;
const struct of_device_id *of_id;
const struct mfd_cell *cells;
unsigned int irq, size;
int ret;
of_id = of_match_node(sun4i_gpadc_of_match, pdev->dev.of_node);
if (!of_id)
return -EINVAL;
switch ((long)of_id->data) {
case ARCH_SUN4I_A10:
cells = sun4i_gpadc_cells;
size = ARRAY_SIZE(sun4i_gpadc_cells);
break;
case ARCH_SUN5I_A13:
cells = sun5i_gpadc_cells;
size = ARRAY_SIZE(sun5i_gpadc_cells);
break;
case ARCH_SUN6I_A31:
cells = sun6i_gpadc_cells;
size = ARRAY_SIZE(sun6i_gpadc_cells);
break;
default:
return -EINVAL;
}
dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
if (!dev)
return -ENOMEM;
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
dev->base = devm_ioremap_resource(&pdev->dev, mem);
if (IS_ERR(dev->base))
return PTR_ERR(dev->base);
dev->dev = &pdev->dev;
dev_set_drvdata(dev->dev, dev);
dev->regmap = devm_regmap_init_mmio(dev->dev, dev->base,
&sun4i_gpadc_regmap_config);
if (IS_ERR(dev->regmap)) {
ret = PTR_ERR(dev->regmap);
dev_err(&pdev->dev, "failed to init regmap: %d\n", ret);
return ret;
}
/* Disable all interrupts */
regmap_write(dev->regmap, SUN4I_GPADC_INT_FIFOC, 0);
irq = platform_get_irq(pdev, 0);
ret = devm_regmap_add_irq_chip(&pdev->dev, dev->regmap, irq,
IRQF_ONESHOT, 0,
&sun4i_gpadc_regmap_irq_chip,
&dev->regmap_irqc);
if (ret) {
dev_err(&pdev->dev, "failed to add irq chip: %d\n", ret);
return ret;
}
ret = devm_mfd_add_devices(dev->dev, 0, cells, size, NULL, 0, NULL);
if (ret) {
dev_err(&pdev->dev, "failed to add MFD devices: %d\n", ret);
return ret;
}
return 0;
}
static struct platform_driver sun4i_gpadc_driver = {
.driver = {
.name = "sun4i-gpadc",
.of_match_table = of_match_ptr(sun4i_gpadc_of_match),
},
.probe = sun4i_gpadc_probe,
};
module_platform_driver(sun4i_gpadc_driver);
MODULE_DESCRIPTION("Allwinner sunxi platforms' GPADC MFD core driver");
MODULE_AUTHOR("Quentin Schulz <quentin.schulz@free-electrons.com>");
MODULE_LICENSE("GPL v2");
|
