Commit | Line | Data |
---|---|---|
2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
ffd8a6e7 LP |
2 | /* |
3 | * Nano River Technologies viperboard IIO ADC driver | |
4 | * | |
5 | * (C) 2012 by Lemonage GmbH | |
6 | * Author: Lars Poeschel <poeschel@lemonage.de> | |
7 | * All rights reserved. | |
ffd8a6e7 LP |
8 | */ |
9 | ||
10 | #include <linux/kernel.h> | |
11 | #include <linux/errno.h> | |
12 | #include <linux/module.h> | |
13 | #include <linux/slab.h> | |
14 | #include <linux/types.h> | |
15 | #include <linux/mutex.h> | |
16 | #include <linux/platform_device.h> | |
17 | ||
18 | #include <linux/usb.h> | |
19 | #include <linux/iio/iio.h> | |
20 | ||
21 | #include <linux/mfd/viperboard.h> | |
22 | ||
23 | #define VPRBRD_ADC_CMD_GET 0x00 | |
24 | ||
25 | struct vprbrd_adc_msg { | |
26 | u8 cmd; | |
27 | u8 chan; | |
28 | u8 val; | |
29 | } __packed; | |
30 | ||
31 | struct vprbrd_adc { | |
32 | struct vprbrd *vb; | |
33 | }; | |
34 | ||
35 | #define VPRBRD_ADC_CHANNEL(_index) { \ | |
36 | .type = IIO_VOLTAGE, \ | |
37 | .indexed = 1, \ | |
38 | .channel = _index, \ | |
91239722 | 39 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ |
ffd8a6e7 LP |
40 | } |
41 | ||
42 | static struct iio_chan_spec const vprbrd_adc_iio_channels[] = { | |
43 | VPRBRD_ADC_CHANNEL(0), | |
44 | VPRBRD_ADC_CHANNEL(1), | |
45 | VPRBRD_ADC_CHANNEL(2), | |
46 | VPRBRD_ADC_CHANNEL(3), | |
47 | }; | |
48 | ||
49 | static int vprbrd_iio_read_raw(struct iio_dev *iio_dev, | |
50 | struct iio_chan_spec const *chan, | |
51 | int *val, | |
52 | int *val2, | |
53 | long info) | |
54 | { | |
55 | int ret, error = 0; | |
56 | struct vprbrd_adc *adc = iio_priv(iio_dev); | |
57 | struct vprbrd *vb = adc->vb; | |
58 | struct vprbrd_adc_msg *admsg = (struct vprbrd_adc_msg *)vb->buf; | |
59 | ||
60 | switch (info) { | |
61 | case IIO_CHAN_INFO_RAW: | |
62 | mutex_lock(&vb->lock); | |
63 | ||
64 | admsg->cmd = VPRBRD_ADC_CMD_GET; | |
f227c132 | 65 | admsg->chan = chan->channel; |
ffd8a6e7 LP |
66 | admsg->val = 0x00; |
67 | ||
68 | ret = usb_control_msg(vb->usb_dev, | |
69 | usb_sndctrlpipe(vb->usb_dev, 0), VPRBRD_USB_REQUEST_ADC, | |
70 | VPRBRD_USB_TYPE_OUT, 0x0000, 0x0000, admsg, | |
71 | sizeof(struct vprbrd_adc_msg), VPRBRD_USB_TIMEOUT_MS); | |
72 | if (ret != sizeof(struct vprbrd_adc_msg)) { | |
73 | dev_err(&iio_dev->dev, "usb send error on adc read\n"); | |
74 | error = -EREMOTEIO; | |
75 | } | |
76 | ||
77 | ret = usb_control_msg(vb->usb_dev, | |
78 | usb_rcvctrlpipe(vb->usb_dev, 0), VPRBRD_USB_REQUEST_ADC, | |
79 | VPRBRD_USB_TYPE_IN, 0x0000, 0x0000, admsg, | |
80 | sizeof(struct vprbrd_adc_msg), VPRBRD_USB_TIMEOUT_MS); | |
81 | ||
82 | *val = admsg->val; | |
83 | ||
84 | mutex_unlock(&vb->lock); | |
85 | ||
86 | if (ret != sizeof(struct vprbrd_adc_msg)) { | |
87 | dev_err(&iio_dev->dev, "usb recv error on adc read\n"); | |
88 | error = -EREMOTEIO; | |
89 | } | |
90 | ||
91 | if (error) | |
92 | goto error; | |
93 | ||
94 | return IIO_VAL_INT; | |
95 | default: | |
96 | error = -EINVAL; | |
97 | break; | |
98 | } | |
99 | error: | |
100 | return error; | |
101 | } | |
102 | ||
103 | static const struct iio_info vprbrd_adc_iio_info = { | |
104 | .read_raw = &vprbrd_iio_read_raw, | |
ffd8a6e7 LP |
105 | }; |
106 | ||
fc52692c | 107 | static int vprbrd_adc_probe(struct platform_device *pdev) |
ffd8a6e7 LP |
108 | { |
109 | struct vprbrd *vb = dev_get_drvdata(pdev->dev.parent); | |
110 | struct vprbrd_adc *adc; | |
111 | struct iio_dev *indio_dev; | |
112 | int ret; | |
113 | ||
114 | /* registering iio */ | |
3ef50f88 | 115 | indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*adc)); |
ffd8a6e7 LP |
116 | if (!indio_dev) { |
117 | dev_err(&pdev->dev, "failed allocating iio device\n"); | |
118 | return -ENOMEM; | |
119 | } | |
120 | ||
121 | adc = iio_priv(indio_dev); | |
122 | adc->vb = vb; | |
123 | indio_dev->name = "viperboard adc"; | |
ffd8a6e7 LP |
124 | indio_dev->info = &vprbrd_adc_iio_info; |
125 | indio_dev->modes = INDIO_DIRECT_MODE; | |
126 | indio_dev->channels = vprbrd_adc_iio_channels; | |
127 | indio_dev->num_channels = ARRAY_SIZE(vprbrd_adc_iio_channels); | |
128 | ||
2191d0fb | 129 | ret = devm_iio_device_register(&pdev->dev, indio_dev); |
ffd8a6e7 LP |
130 | if (ret) { |
131 | dev_err(&pdev->dev, "could not register iio (adc)"); | |
3ef50f88 | 132 | return ret; |
ffd8a6e7 LP |
133 | } |
134 | ||
ffd8a6e7 | 135 | return 0; |
ffd8a6e7 LP |
136 | } |
137 | ||
ffd8a6e7 LP |
138 | static struct platform_driver vprbrd_adc_driver = { |
139 | .driver = { | |
140 | .name = "viperboard-adc", | |
ffd8a6e7 LP |
141 | }, |
142 | .probe = vprbrd_adc_probe, | |
ffd8a6e7 LP |
143 | }; |
144 | ||
145 | module_platform_driver(vprbrd_adc_driver); | |
146 | ||
147 | MODULE_AUTHOR("Lars Poeschel <poeschel@lemonage.de>"); | |
148 | MODULE_DESCRIPTION("IIO ADC driver for Nano River Techs Viperboard"); | |
149 | MODULE_LICENSE("GPL"); | |
150 | MODULE_ALIAS("platform:viperboard-adc"); |