^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Nano River Technologies viperboard IIO ADC driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * (C) 2012 by Lemonage GmbH
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Author: Lars Poeschel <poeschel@lemonage.de>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/mutex.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/usb.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/iio/iio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/mfd/viperboard.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #define VPRBRD_ADC_CMD_GET 0x00
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) struct vprbrd_adc_msg {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) u8 cmd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) u8 chan;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) u8 val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) } __packed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) struct vprbrd_adc {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) struct vprbrd *vb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #define VPRBRD_ADC_CHANNEL(_index) { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) .type = IIO_VOLTAGE, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) .indexed = 1, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) .channel = _index, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) static struct iio_chan_spec const vprbrd_adc_iio_channels[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) VPRBRD_ADC_CHANNEL(0),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) VPRBRD_ADC_CHANNEL(1),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) VPRBRD_ADC_CHANNEL(2),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) VPRBRD_ADC_CHANNEL(3),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) static int vprbrd_iio_read_raw(struct iio_dev *iio_dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) struct iio_chan_spec const *chan,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) int *val,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) int *val2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) long info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) int ret, error = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) struct vprbrd_adc *adc = iio_priv(iio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) struct vprbrd *vb = adc->vb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) struct vprbrd_adc_msg *admsg = (struct vprbrd_adc_msg *)vb->buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) switch (info) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) case IIO_CHAN_INFO_RAW:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) mutex_lock(&vb->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) admsg->cmd = VPRBRD_ADC_CMD_GET;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) admsg->chan = chan->channel;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) admsg->val = 0x00;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) ret = usb_control_msg(vb->usb_dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) usb_sndctrlpipe(vb->usb_dev, 0), VPRBRD_USB_REQUEST_ADC,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) VPRBRD_USB_TYPE_OUT, 0x0000, 0x0000, admsg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) sizeof(struct vprbrd_adc_msg), VPRBRD_USB_TIMEOUT_MS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) if (ret != sizeof(struct vprbrd_adc_msg)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) dev_err(&iio_dev->dev, "usb send error on adc read\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) error = -EREMOTEIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) ret = usb_control_msg(vb->usb_dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) usb_rcvctrlpipe(vb->usb_dev, 0), VPRBRD_USB_REQUEST_ADC,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) VPRBRD_USB_TYPE_IN, 0x0000, 0x0000, admsg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) sizeof(struct vprbrd_adc_msg), VPRBRD_USB_TIMEOUT_MS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) *val = admsg->val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) mutex_unlock(&vb->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) if (ret != sizeof(struct vprbrd_adc_msg)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) dev_err(&iio_dev->dev, "usb recv error on adc read\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) error = -EREMOTEIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) return IIO_VAL_INT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) error = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) error:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) static const struct iio_info vprbrd_adc_iio_info = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) .read_raw = &vprbrd_iio_read_raw,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) static int vprbrd_adc_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) struct vprbrd *vb = dev_get_drvdata(pdev->dev.parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) struct vprbrd_adc *adc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) struct iio_dev *indio_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) /* registering iio */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*adc));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) if (!indio_dev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) dev_err(&pdev->dev, "failed allocating iio device\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) adc = iio_priv(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) adc->vb = vb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) indio_dev->name = "viperboard adc";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) indio_dev->info = &vprbrd_adc_iio_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) indio_dev->modes = INDIO_DIRECT_MODE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) indio_dev->channels = vprbrd_adc_iio_channels;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) indio_dev->num_channels = ARRAY_SIZE(vprbrd_adc_iio_channels);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) ret = devm_iio_device_register(&pdev->dev, indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) dev_err(&pdev->dev, "could not register iio (adc)");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) static struct platform_driver vprbrd_adc_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) .name = "viperboard-adc",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) .probe = vprbrd_adc_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) module_platform_driver(vprbrd_adc_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) MODULE_AUTHOR("Lars Poeschel <poeschel@lemonage.de>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) MODULE_DESCRIPTION("IIO ADC driver for Nano River Techs Viperboard");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) MODULE_ALIAS("platform:viperboard-adc");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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