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ffd8a6e7 LP |
1 | /* |
2 | * Nano River Technologies viperboard IIO ADC driver | |
3 | * | |
4 | * (C) 2012 by Lemonage GmbH | |
5 | * Author: Lars Poeschel <poeschel@lemonage.de> | |
6 | * All rights reserved. | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU General Public License as published by the | |
10 | * Free Software Foundation; either version 2 of the License, or (at your | |
11 | * option) any later version. | |
12 | * | |
13 | */ | |
14 | ||
15 | #include <linux/kernel.h> | |
16 | #include <linux/errno.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/slab.h> | |
19 | #include <linux/types.h> | |
20 | #include <linux/mutex.h> | |
21 | #include <linux/platform_device.h> | |
22 | ||
23 | #include <linux/usb.h> | |
24 | #include <linux/iio/iio.h> | |
25 | ||
26 | #include <linux/mfd/viperboard.h> | |
27 | ||
28 | #define VPRBRD_ADC_CMD_GET 0x00 | |
29 | ||
30 | struct vprbrd_adc_msg { | |
31 | u8 cmd; | |
32 | u8 chan; | |
33 | u8 val; | |
34 | } __packed; | |
35 | ||
36 | struct vprbrd_adc { | |
37 | struct vprbrd *vb; | |
38 | }; | |
39 | ||
40 | #define VPRBRD_ADC_CHANNEL(_index) { \ | |
41 | .type = IIO_VOLTAGE, \ | |
42 | .indexed = 1, \ | |
43 | .channel = _index, \ | |
91239722 | 44 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ |
ffd8a6e7 LP |
45 | } |
46 | ||
47 | static struct iio_chan_spec const vprbrd_adc_iio_channels[] = { | |
48 | VPRBRD_ADC_CHANNEL(0), | |
49 | VPRBRD_ADC_CHANNEL(1), | |
50 | VPRBRD_ADC_CHANNEL(2), | |
51 | VPRBRD_ADC_CHANNEL(3), | |
52 | }; | |
53 | ||
54 | static int vprbrd_iio_read_raw(struct iio_dev *iio_dev, | |
55 | struct iio_chan_spec const *chan, | |
56 | int *val, | |
57 | int *val2, | |
58 | long info) | |
59 | { | |
60 | int ret, error = 0; | |
61 | struct vprbrd_adc *adc = iio_priv(iio_dev); | |
62 | struct vprbrd *vb = adc->vb; | |
63 | struct vprbrd_adc_msg *admsg = (struct vprbrd_adc_msg *)vb->buf; | |
64 | ||
65 | switch (info) { | |
66 | case IIO_CHAN_INFO_RAW: | |
67 | mutex_lock(&vb->lock); | |
68 | ||
69 | admsg->cmd = VPRBRD_ADC_CMD_GET; | |
f227c132 | 70 | admsg->chan = chan->channel; |
ffd8a6e7 LP |
71 | admsg->val = 0x00; |
72 | ||
73 | ret = usb_control_msg(vb->usb_dev, | |
74 | usb_sndctrlpipe(vb->usb_dev, 0), VPRBRD_USB_REQUEST_ADC, | |
75 | VPRBRD_USB_TYPE_OUT, 0x0000, 0x0000, admsg, | |
76 | sizeof(struct vprbrd_adc_msg), VPRBRD_USB_TIMEOUT_MS); | |
77 | if (ret != sizeof(struct vprbrd_adc_msg)) { | |
78 | dev_err(&iio_dev->dev, "usb send error on adc read\n"); | |
79 | error = -EREMOTEIO; | |
80 | } | |
81 | ||
82 | ret = usb_control_msg(vb->usb_dev, | |
83 | usb_rcvctrlpipe(vb->usb_dev, 0), VPRBRD_USB_REQUEST_ADC, | |
84 | VPRBRD_USB_TYPE_IN, 0x0000, 0x0000, admsg, | |
85 | sizeof(struct vprbrd_adc_msg), VPRBRD_USB_TIMEOUT_MS); | |
86 | ||
87 | *val = admsg->val; | |
88 | ||
89 | mutex_unlock(&vb->lock); | |
90 | ||
91 | if (ret != sizeof(struct vprbrd_adc_msg)) { | |
92 | dev_err(&iio_dev->dev, "usb recv error on adc read\n"); | |
93 | error = -EREMOTEIO; | |
94 | } | |
95 | ||
96 | if (error) | |
97 | goto error; | |
98 | ||
99 | return IIO_VAL_INT; | |
100 | default: | |
101 | error = -EINVAL; | |
102 | break; | |
103 | } | |
104 | error: | |
105 | return error; | |
106 | } | |
107 | ||
108 | static const struct iio_info vprbrd_adc_iio_info = { | |
109 | .read_raw = &vprbrd_iio_read_raw, | |
110 | .driver_module = THIS_MODULE, | |
111 | }; | |
112 | ||
fc52692c | 113 | static int vprbrd_adc_probe(struct platform_device *pdev) |
ffd8a6e7 LP |
114 | { |
115 | struct vprbrd *vb = dev_get_drvdata(pdev->dev.parent); | |
116 | struct vprbrd_adc *adc; | |
117 | struct iio_dev *indio_dev; | |
118 | int ret; | |
119 | ||
120 | /* registering iio */ | |
3ef50f88 | 121 | indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*adc)); |
ffd8a6e7 LP |
122 | if (!indio_dev) { |
123 | dev_err(&pdev->dev, "failed allocating iio device\n"); | |
124 | return -ENOMEM; | |
125 | } | |
126 | ||
127 | adc = iio_priv(indio_dev); | |
128 | adc->vb = vb; | |
129 | indio_dev->name = "viperboard adc"; | |
130 | indio_dev->dev.parent = &pdev->dev; | |
131 | indio_dev->info = &vprbrd_adc_iio_info; | |
132 | indio_dev->modes = INDIO_DIRECT_MODE; | |
133 | indio_dev->channels = vprbrd_adc_iio_channels; | |
134 | indio_dev->num_channels = ARRAY_SIZE(vprbrd_adc_iio_channels); | |
135 | ||
2191d0fb | 136 | ret = devm_iio_device_register(&pdev->dev, indio_dev); |
ffd8a6e7 LP |
137 | if (ret) { |
138 | dev_err(&pdev->dev, "could not register iio (adc)"); | |
3ef50f88 | 139 | return ret; |
ffd8a6e7 LP |
140 | } |
141 | ||
ffd8a6e7 | 142 | return 0; |
ffd8a6e7 LP |
143 | } |
144 | ||
ffd8a6e7 LP |
145 | static struct platform_driver vprbrd_adc_driver = { |
146 | .driver = { | |
147 | .name = "viperboard-adc", | |
ffd8a6e7 LP |
148 | }, |
149 | .probe = vprbrd_adc_probe, | |
ffd8a6e7 LP |
150 | }; |
151 | ||
152 | module_platform_driver(vprbrd_adc_driver); | |
153 | ||
154 | MODULE_AUTHOR("Lars Poeschel <poeschel@lemonage.de>"); | |
155 | MODULE_DESCRIPTION("IIO ADC driver for Nano River Techs Viperboard"); | |
156 | MODULE_LICENSE("GPL"); | |
157 | MODULE_ALIAS("platform:viperboard-adc"); |