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Linux/drivers/staging/iio/adc/ad7606_par.c

  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 
 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 
 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 
 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 
 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
 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 
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 #define AD7606_PAR_PM_OPS (&ad7606_pm_ops)
117 
118 #else
119 #define AD7606_PAR_PM_OPS NULL
120 #endif  /* CONFIG_PM */
121 
122 static struct platform_device_id ad7606_driver_ids[] = {
123         {
124                 .name           = "ad7606-8",
125                 .driver_data    = ID_AD7606_8,
126         }, {
127                 .name           = "ad7606-6",
128                 .driver_data    = ID_AD7606_6,
129         }, {
130                 .name           = "ad7606-4",
131                 .driver_data    = ID_AD7606_4,
132         },
133         { }
134 };
135 
136 MODULE_DEVICE_TABLE(platform, ad7606_driver_ids);
137 
138 static struct platform_driver ad7606_driver = {
139         .probe = ad7606_par_probe,
140         .remove = ad7606_par_remove,
141         .id_table = ad7606_driver_ids,
142         .driver = {
143                 .name    = "ad7606",
144                 .owner  = THIS_MODULE,
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 

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