Thomas Gleixner | 2874c5f | 2019-05-27 08:55:01 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
Lars Poeschel | ffd8a6e | 2012-11-05 15:48:26 +0100 | [diff] [blame] | 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. |
Lars Poeschel | ffd8a6e | 2012-11-05 15:48:26 +0100 | [diff] [blame] | 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, \ |
Jonathan Cameron | 9123972 | 2013-02-27 19:07:39 +0000 | [diff] [blame] | 39 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ |
Lars Poeschel | ffd8a6e | 2012-11-05 15:48:26 +0100 | [diff] [blame] | 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; |
Peter Meerwald | f227c13 | 2013-11-02 19:44:00 +0000 | [diff] [blame] | 65 | admsg->chan = chan->channel; |
Lars Poeschel | ffd8a6e | 2012-11-05 15:48:26 +0100 | [diff] [blame] | 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, |
Lars Poeschel | ffd8a6e | 2012-11-05 15:48:26 +0100 | [diff] [blame] | 105 | }; |
| 106 | |
Greg Kroah-Hartman | fc52692 | 2012-12-21 13:21:43 -0800 | [diff] [blame] | 107 | static int vprbrd_adc_probe(struct platform_device *pdev) |
Lars Poeschel | ffd8a6e | 2012-11-05 15:48:26 +0100 | [diff] [blame] | 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 */ |
Sachin Kamat | 3ef50f8 | 2013-07-23 09:58:00 +0100 | [diff] [blame] | 115 | indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*adc)); |
Lars Poeschel | ffd8a6e | 2012-11-05 15:48:26 +0100 | [diff] [blame] | 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"; |
| 124 | indio_dev->dev.parent = &pdev->dev; |
| 125 | indio_dev->info = &vprbrd_adc_iio_info; |
| 126 | indio_dev->modes = INDIO_DIRECT_MODE; |
| 127 | indio_dev->channels = vprbrd_adc_iio_channels; |
| 128 | indio_dev->num_channels = ARRAY_SIZE(vprbrd_adc_iio_channels); |
| 129 | |
Sachin Kamat | 2191d0f | 2013-10-29 11:39:00 +0000 | [diff] [blame] | 130 | ret = devm_iio_device_register(&pdev->dev, indio_dev); |
Lars Poeschel | ffd8a6e | 2012-11-05 15:48:26 +0100 | [diff] [blame] | 131 | if (ret) { |
| 132 | dev_err(&pdev->dev, "could not register iio (adc)"); |
Sachin Kamat | 3ef50f8 | 2013-07-23 09:58:00 +0100 | [diff] [blame] | 133 | return ret; |
Lars Poeschel | ffd8a6e | 2012-11-05 15:48:26 +0100 | [diff] [blame] | 134 | } |
| 135 | |
Lars Poeschel | ffd8a6e | 2012-11-05 15:48:26 +0100 | [diff] [blame] | 136 | return 0; |
Lars Poeschel | ffd8a6e | 2012-11-05 15:48:26 +0100 | [diff] [blame] | 137 | } |
| 138 | |
Lars Poeschel | ffd8a6e | 2012-11-05 15:48:26 +0100 | [diff] [blame] | 139 | static struct platform_driver vprbrd_adc_driver = { |
| 140 | .driver = { |
| 141 | .name = "viperboard-adc", |
Lars Poeschel | ffd8a6e | 2012-11-05 15:48:26 +0100 | [diff] [blame] | 142 | }, |
| 143 | .probe = vprbrd_adc_probe, |
Lars Poeschel | ffd8a6e | 2012-11-05 15:48:26 +0100 | [diff] [blame] | 144 | }; |
| 145 | |
| 146 | module_platform_driver(vprbrd_adc_driver); |
| 147 | |
| 148 | MODULE_AUTHOR("Lars Poeschel <poeschel@lemonage.de>"); |
| 149 | MODULE_DESCRIPTION("IIO ADC driver for Nano River Techs Viperboard"); |
| 150 | MODULE_LICENSE("GPL"); |
| 151 | MODULE_ALIAS("platform:viperboard-adc"); |