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 ret, 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 if (!res)
66 return -ENODEV;
67
68 remap_size = resource_size(res);
69
70 /* Request the regions */
71 if (!request_mem_region(res->start, remap_size, "iio-ad7606")) {
72 ret = -EBUSY;
73 goto out1;
74 }
75 addr = ioremap(res->start, remap_size);
76 if (!addr) {
77 ret = -ENOMEM;
78 goto out1;
79 }
80
81 indio_dev = ad7606_probe(&pdev->dev, irq, addr,
82 platform_get_device_id(pdev)->driver_data,
83 remap_size > 1 ? &ad7606_par16_bops :
84 &ad7606_par8_bops);
85
86 if (IS_ERR(indio_dev)) {
87 ret = PTR_ERR(indio_dev);
88 goto out2;
89 }
90
91 platform_set_drvdata(pdev, indio_dev);
92
93 return 0;
94
95 out2:
96 iounmap(addr);
97 out1:
98 release_mem_region(res->start, remap_size);
99
100 return ret;
101 }
102
ad7606_par_remove(struct platform_device * pdev)103 static int ad7606_par_remove(struct platform_device *pdev)
104 {
105 struct iio_dev *indio_dev = platform_get_drvdata(pdev);
106 struct resource *res;
107 struct ad7606_state *st = iio_priv(indio_dev);
108
109 ad7606_remove(indio_dev, platform_get_irq(pdev, 0));
110
111 iounmap(st->base_address);
112 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
113 release_mem_region(res->start, resource_size(res));
114
115 platform_set_drvdata(pdev, NULL);
116
117 return 0;
118 }
119
120 #ifdef CONFIG_PM
ad7606_par_suspend(struct device * dev)121 static int ad7606_par_suspend(struct device *dev)
122 {
123 struct iio_dev *indio_dev = dev_get_drvdata(dev);
124
125 ad7606_suspend(indio_dev);
126
127 return 0;
128 }
129
ad7606_par_resume(struct device * dev)130 static int ad7606_par_resume(struct device *dev)
131 {
132 struct iio_dev *indio_dev = dev_get_drvdata(dev);
133
134 ad7606_resume(indio_dev);
135
136 return 0;
137 }
138
139 static const struct dev_pm_ops ad7606_pm_ops = {
140 .suspend = ad7606_par_suspend,
141 .resume = ad7606_par_resume,
142 };
143 #define AD7606_PAR_PM_OPS (&ad7606_pm_ops)
144
145 #else
146 #define AD7606_PAR_PM_OPS NULL
147 #endif /* CONFIG_PM */
148
149 static struct platform_device_id ad7606_driver_ids[] = {
150 {
151 .name = "ad7606-8",
152 .driver_data = ID_AD7606_8,
153 }, {
154 .name = "ad7606-6",
155 .driver_data = ID_AD7606_6,
156 }, {
157 .name = "ad7606-4",
158 .driver_data = ID_AD7606_4,
159 },
160 { }
161 };
162
163 MODULE_DEVICE_TABLE(platform, ad7606_driver_ids);
164
165 static struct platform_driver ad7606_driver = {
166 .probe = ad7606_par_probe,
167 .remove = ad7606_par_remove,
168 .id_table = ad7606_driver_ids,
169 .driver = {
170 .name = "ad7606",
171 .owner = THIS_MODULE,
172 .pm = AD7606_PAR_PM_OPS,
173 },
174 };
175
176 module_platform_driver(ad7606_driver);
177
178 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
179 MODULE_DESCRIPTION("Analog Devices AD7606 ADC");
180 MODULE_LICENSE("GPL v2");
181