1 /*
2 * AD7606 Parallel Interface ADC driver
3 *
4 * Copyright 2011 Analog Devices Inc.
5 *
6 * Licensed under the GPL-2.
7 */
8
9 #include <linux/module.h>
10 #include <linux/platform_device.h>
11 #include <linux/types.h>
12 #include <linux/err.h>
13 #include <linux/io.h>
14
15 #include <linux/iio/iio.h>
16 #include "ad7606.h"
17
ad7606_par16_read_block(struct device * dev,int count,void * buf)18 static int ad7606_par16_read_block(struct device *dev,
19 int count, void *buf)
20 {
21 struct platform_device *pdev = to_platform_device(dev);
22 struct iio_dev *indio_dev = platform_get_drvdata(pdev);
23 struct ad7606_state *st = iio_priv(indio_dev);
24
25 insw((unsigned long)st->base_address, buf, count);
26
27 return 0;
28 }
29
30 static const struct ad7606_bus_ops ad7606_par16_bops = {
31 .read_block = ad7606_par16_read_block,
32 };
33
ad7606_par8_read_block(struct device * dev,int count,void * buf)34 static int ad7606_par8_read_block(struct device *dev,
35 int count, void *buf)
36 {
37 struct platform_device *pdev = to_platform_device(dev);
38 struct iio_dev *indio_dev = platform_get_drvdata(pdev);
39 struct ad7606_state *st = iio_priv(indio_dev);
40
41 insb((unsigned long)st->base_address, buf, count * 2);
42
43 return 0;
44 }
45
46 static const struct ad7606_bus_ops ad7606_par8_bops = {
47 .read_block = ad7606_par8_read_block,
48 };
49
ad7606_par_probe(struct platform_device * pdev)50 static int ad7606_par_probe(struct platform_device *pdev)
51 {
52 struct resource *res;
53 struct iio_dev *indio_dev;
54 void __iomem *addr;
55 resource_size_t remap_size;
56 int irq;
57
58 irq = platform_get_irq(pdev, 0);
59 if (irq < 0) {
60 dev_err(&pdev->dev, "no irq\n");
61 return -ENODEV;
62 }
63
64 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
65 addr = devm_ioremap_resource(&pdev->dev, res);
66 if (IS_ERR(addr))
67 return PTR_ERR(addr);
68
69 remap_size = resource_size(res);
70
71 indio_dev = ad7606_probe(&pdev->dev, irq, addr,
72 platform_get_device_id(pdev)->driver_data,
73 remap_size > 1 ? &ad7606_par16_bops :
74 &ad7606_par8_bops);
75
76 if (IS_ERR(indio_dev))
77 return PTR_ERR(indio_dev);
78
79 platform_set_drvdata(pdev, indio_dev);
80
81 return 0;
82 }
83
ad7606_par_remove(struct platform_device * pdev)84 static int ad7606_par_remove(struct platform_device *pdev)
85 {
86 struct iio_dev *indio_dev = platform_get_drvdata(pdev);
87
88 ad7606_remove(indio_dev, platform_get_irq(pdev, 0));
89
90 return 0;
91 }
92
93 #ifdef CONFIG_PM
ad7606_par_suspend(struct device * dev)94 static int ad7606_par_suspend(struct device *dev)
95 {
96 struct iio_dev *indio_dev = dev_get_drvdata(dev);
97
98 ad7606_suspend(indio_dev);
99
100 return 0;
101 }
102
ad7606_par_resume(struct device * dev)103 static int ad7606_par_resume(struct device *dev)
104 {
105 struct iio_dev *indio_dev = dev_get_drvdata(dev);
106
107 ad7606_resume(indio_dev);
108
109 return 0;
110 }
111
112 static const struct dev_pm_ops ad7606_pm_ops = {
113 .suspend = ad7606_par_suspend,
114 .resume = ad7606_par_resume,
115 };
116
117 #define AD7606_PAR_PM_OPS (&ad7606_pm_ops)
118
119 #else
120 #define AD7606_PAR_PM_OPS NULL
121 #endif /* CONFIG_PM */
122
123 static const struct platform_device_id ad7606_driver_ids[] = {
124 {
125 .name = "ad7606-8",
126 .driver_data = ID_AD7606_8,
127 }, {
128 .name = "ad7606-6",
129 .driver_data = ID_AD7606_6,
130 }, {
131 .name = "ad7606-4",
132 .driver_data = ID_AD7606_4,
133 },
134 { }
135 };
136
137 MODULE_DEVICE_TABLE(platform, ad7606_driver_ids);
138
139 static struct platform_driver ad7606_driver = {
140 .probe = ad7606_par_probe,
141 .remove = ad7606_par_remove,
142 .id_table = ad7606_driver_ids,
143 .driver = {
144 .name = "ad7606",
145 .pm = AD7606_PAR_PM_OPS,
146 },
147 };
148
149 module_platform_driver(ad7606_driver);
150
151 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
152 MODULE_DESCRIPTION("Analog Devices AD7606 ADC");
153 MODULE_LICENSE("GPL v2");
154