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481 lines
12 KiB
481 lines
12 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Analog Devices Generic AXI ADC IP core |
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* Link: https://wiki.analog.com/resources/fpga/docs/axi_adc_ip |
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* |
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* Copyright 2012-2020 Analog Devices Inc. |
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*/ |
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#include <linux/bitfield.h> |
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#include <linux/clk.h> |
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#include <linux/io.h> |
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#include <linux/delay.h> |
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#include <linux/module.h> |
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#include <linux/of_device.h> |
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#include <linux/platform_device.h> |
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#include <linux/slab.h> |
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#include <linux/iio/iio.h> |
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#include <linux/iio/sysfs.h> |
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#include <linux/iio/buffer.h> |
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#include <linux/iio/buffer-dmaengine.h> |
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#include <linux/fpga/adi-axi-common.h> |
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#include <linux/iio/adc/adi-axi-adc.h> |
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/** |
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* Register definitions: |
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* https://wiki.analog.com/resources/fpga/docs/axi_adc_ip#register_map |
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*/ |
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|
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/* ADC controls */ |
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#define ADI_AXI_REG_RSTN 0x0040 |
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#define ADI_AXI_REG_RSTN_CE_N BIT(2) |
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#define ADI_AXI_REG_RSTN_MMCM_RSTN BIT(1) |
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#define ADI_AXI_REG_RSTN_RSTN BIT(0) |
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/* ADC Channel controls */ |
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#define ADI_AXI_REG_CHAN_CTRL(c) (0x0400 + (c) * 0x40) |
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#define ADI_AXI_REG_CHAN_CTRL_LB_OWR BIT(11) |
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#define ADI_AXI_REG_CHAN_CTRL_PN_SEL_OWR BIT(10) |
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#define ADI_AXI_REG_CHAN_CTRL_IQCOR_EN BIT(9) |
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#define ADI_AXI_REG_CHAN_CTRL_DCFILT_EN BIT(8) |
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#define ADI_AXI_REG_CHAN_CTRL_FMT_SIGNEXT BIT(6) |
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#define ADI_AXI_REG_CHAN_CTRL_FMT_TYPE BIT(5) |
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#define ADI_AXI_REG_CHAN_CTRL_FMT_EN BIT(4) |
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#define ADI_AXI_REG_CHAN_CTRL_PN_TYPE_OWR BIT(1) |
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#define ADI_AXI_REG_CHAN_CTRL_ENABLE BIT(0) |
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#define ADI_AXI_REG_CHAN_CTRL_DEFAULTS \ |
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(ADI_AXI_REG_CHAN_CTRL_FMT_SIGNEXT | \ |
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ADI_AXI_REG_CHAN_CTRL_FMT_EN | \ |
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ADI_AXI_REG_CHAN_CTRL_ENABLE) |
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struct adi_axi_adc_core_info { |
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unsigned int version; |
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}; |
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struct adi_axi_adc_state { |
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struct mutex lock; |
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struct adi_axi_adc_client *client; |
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void __iomem *regs; |
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}; |
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struct adi_axi_adc_client { |
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struct list_head entry; |
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struct adi_axi_adc_conv conv; |
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struct adi_axi_adc_state *state; |
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struct device *dev; |
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const struct adi_axi_adc_core_info *info; |
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}; |
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static LIST_HEAD(registered_clients); |
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static DEFINE_MUTEX(registered_clients_lock); |
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static struct adi_axi_adc_client *conv_to_client(struct adi_axi_adc_conv *conv) |
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{ |
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return container_of(conv, struct adi_axi_adc_client, conv); |
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} |
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void *adi_axi_adc_conv_priv(struct adi_axi_adc_conv *conv) |
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{ |
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struct adi_axi_adc_client *cl = conv_to_client(conv); |
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return (char *)cl + ALIGN(sizeof(struct adi_axi_adc_client), IIO_ALIGN); |
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} |
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EXPORT_SYMBOL_GPL(adi_axi_adc_conv_priv); |
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static void adi_axi_adc_write(struct adi_axi_adc_state *st, |
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unsigned int reg, |
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unsigned int val) |
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{ |
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iowrite32(val, st->regs + reg); |
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} |
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static unsigned int adi_axi_adc_read(struct adi_axi_adc_state *st, |
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unsigned int reg) |
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{ |
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return ioread32(st->regs + reg); |
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} |
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static int adi_axi_adc_config_dma_buffer(struct device *dev, |
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struct iio_dev *indio_dev) |
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{ |
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struct iio_buffer *buffer; |
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const char *dma_name; |
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if (!device_property_present(dev, "dmas")) |
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return 0; |
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if (device_property_read_string(dev, "dma-names", &dma_name)) |
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dma_name = "rx"; |
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buffer = devm_iio_dmaengine_buffer_alloc(indio_dev->dev.parent, |
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dma_name); |
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if (IS_ERR(buffer)) |
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return PTR_ERR(buffer); |
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indio_dev->modes |= INDIO_BUFFER_HARDWARE; |
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iio_device_attach_buffer(indio_dev, buffer); |
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return 0; |
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} |
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static int adi_axi_adc_read_raw(struct iio_dev *indio_dev, |
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struct iio_chan_spec const *chan, |
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int *val, int *val2, long mask) |
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{ |
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struct adi_axi_adc_state *st = iio_priv(indio_dev); |
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struct adi_axi_adc_conv *conv = &st->client->conv; |
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if (!conv->read_raw) |
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return -EOPNOTSUPP; |
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return conv->read_raw(conv, chan, val, val2, mask); |
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} |
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static int adi_axi_adc_write_raw(struct iio_dev *indio_dev, |
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struct iio_chan_spec const *chan, |
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int val, int val2, long mask) |
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{ |
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struct adi_axi_adc_state *st = iio_priv(indio_dev); |
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struct adi_axi_adc_conv *conv = &st->client->conv; |
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if (!conv->write_raw) |
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return -EOPNOTSUPP; |
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return conv->write_raw(conv, chan, val, val2, mask); |
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} |
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static int adi_axi_adc_update_scan_mode(struct iio_dev *indio_dev, |
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const unsigned long *scan_mask) |
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{ |
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struct adi_axi_adc_state *st = iio_priv(indio_dev); |
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struct adi_axi_adc_conv *conv = &st->client->conv; |
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unsigned int i, ctrl; |
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for (i = 0; i < conv->chip_info->num_channels; i++) { |
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ctrl = adi_axi_adc_read(st, ADI_AXI_REG_CHAN_CTRL(i)); |
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if (test_bit(i, scan_mask)) |
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ctrl |= ADI_AXI_REG_CHAN_CTRL_ENABLE; |
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else |
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ctrl &= ~ADI_AXI_REG_CHAN_CTRL_ENABLE; |
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adi_axi_adc_write(st, ADI_AXI_REG_CHAN_CTRL(i), ctrl); |
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} |
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return 0; |
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} |
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static struct adi_axi_adc_conv *adi_axi_adc_conv_register(struct device *dev, |
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size_t sizeof_priv) |
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{ |
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struct adi_axi_adc_client *cl; |
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size_t alloc_size; |
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alloc_size = ALIGN(sizeof(struct adi_axi_adc_client), IIO_ALIGN); |
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if (sizeof_priv) |
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alloc_size += ALIGN(sizeof_priv, IIO_ALIGN); |
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cl = kzalloc(alloc_size, GFP_KERNEL); |
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if (!cl) |
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return ERR_PTR(-ENOMEM); |
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mutex_lock(®istered_clients_lock); |
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cl->dev = get_device(dev); |
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list_add_tail(&cl->entry, ®istered_clients); |
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mutex_unlock(®istered_clients_lock); |
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return &cl->conv; |
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} |
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static void adi_axi_adc_conv_unregister(struct adi_axi_adc_conv *conv) |
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{ |
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struct adi_axi_adc_client *cl = conv_to_client(conv); |
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mutex_lock(®istered_clients_lock); |
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list_del(&cl->entry); |
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put_device(cl->dev); |
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mutex_unlock(®istered_clients_lock); |
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kfree(cl); |
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} |
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static void devm_adi_axi_adc_conv_release(struct device *dev, void *res) |
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{ |
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adi_axi_adc_conv_unregister(*(struct adi_axi_adc_conv **)res); |
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} |
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struct adi_axi_adc_conv *devm_adi_axi_adc_conv_register(struct device *dev, |
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size_t sizeof_priv) |
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{ |
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struct adi_axi_adc_conv **ptr, *conv; |
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ptr = devres_alloc(devm_adi_axi_adc_conv_release, sizeof(*ptr), |
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GFP_KERNEL); |
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if (!ptr) |
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return ERR_PTR(-ENOMEM); |
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conv = adi_axi_adc_conv_register(dev, sizeof_priv); |
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if (IS_ERR(conv)) { |
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devres_free(ptr); |
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return ERR_CAST(conv); |
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} |
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*ptr = conv; |
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devres_add(dev, ptr); |
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return conv; |
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} |
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EXPORT_SYMBOL_GPL(devm_adi_axi_adc_conv_register); |
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static ssize_t in_voltage_scale_available_show(struct device *dev, |
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struct device_attribute *attr, |
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char *buf) |
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{ |
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struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
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struct adi_axi_adc_state *st = iio_priv(indio_dev); |
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struct adi_axi_adc_conv *conv = &st->client->conv; |
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size_t len = 0; |
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int i; |
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for (i = 0; i < conv->chip_info->num_scales; i++) { |
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const unsigned int *s = conv->chip_info->scale_table[i]; |
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len += scnprintf(buf + len, PAGE_SIZE - len, |
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"%u.%06u ", s[0], s[1]); |
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} |
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buf[len - 1] = '\n'; |
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return len; |
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} |
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static IIO_DEVICE_ATTR_RO(in_voltage_scale_available, 0); |
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enum { |
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ADI_AXI_ATTR_SCALE_AVAIL, |
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}; |
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#define ADI_AXI_ATTR(_en_, _file_) \ |
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[ADI_AXI_ATTR_##_en_] = &iio_dev_attr_##_file_.dev_attr.attr |
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static struct attribute *adi_axi_adc_attributes[] = { |
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ADI_AXI_ATTR(SCALE_AVAIL, in_voltage_scale_available), |
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NULL |
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}; |
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static umode_t axi_adc_attr_is_visible(struct kobject *kobj, |
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struct attribute *attr, int n) |
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{ |
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struct device *dev = kobj_to_dev(kobj); |
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struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
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struct adi_axi_adc_state *st = iio_priv(indio_dev); |
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struct adi_axi_adc_conv *conv = &st->client->conv; |
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switch (n) { |
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case ADI_AXI_ATTR_SCALE_AVAIL: |
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if (!conv->chip_info->num_scales) |
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return 0; |
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return attr->mode; |
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default: |
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return attr->mode; |
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} |
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} |
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static const struct attribute_group adi_axi_adc_attribute_group = { |
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.attrs = adi_axi_adc_attributes, |
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.is_visible = axi_adc_attr_is_visible, |
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}; |
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static const struct iio_info adi_axi_adc_info = { |
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.read_raw = &adi_axi_adc_read_raw, |
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.write_raw = &adi_axi_adc_write_raw, |
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.attrs = &adi_axi_adc_attribute_group, |
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.update_scan_mode = &adi_axi_adc_update_scan_mode, |
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}; |
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static const struct adi_axi_adc_core_info adi_axi_adc_10_0_a_info = { |
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.version = ADI_AXI_PCORE_VER(10, 0, 'a'), |
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}; |
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static struct adi_axi_adc_client *adi_axi_adc_attach_client(struct device *dev) |
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{ |
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const struct adi_axi_adc_core_info *info; |
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struct adi_axi_adc_client *cl; |
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struct device_node *cln; |
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info = of_device_get_match_data(dev); |
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if (!info) |
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return ERR_PTR(-ENODEV); |
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cln = of_parse_phandle(dev->of_node, "adi,adc-dev", 0); |
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if (!cln) { |
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dev_err(dev, "No 'adi,adc-dev' node defined\n"); |
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return ERR_PTR(-ENODEV); |
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} |
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mutex_lock(®istered_clients_lock); |
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list_for_each_entry(cl, ®istered_clients, entry) { |
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if (!cl->dev) |
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continue; |
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if (cl->dev->of_node != cln) |
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continue; |
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if (!try_module_get(cl->dev->driver->owner)) { |
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mutex_unlock(®istered_clients_lock); |
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return ERR_PTR(-ENODEV); |
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} |
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get_device(cl->dev); |
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cl->info = info; |
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mutex_unlock(®istered_clients_lock); |
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return cl; |
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} |
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mutex_unlock(®istered_clients_lock); |
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return ERR_PTR(-EPROBE_DEFER); |
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} |
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static int adi_axi_adc_setup_channels(struct device *dev, |
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struct adi_axi_adc_state *st) |
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{ |
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struct adi_axi_adc_conv *conv = &st->client->conv; |
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int i, ret; |
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if (conv->preenable_setup) { |
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ret = conv->preenable_setup(conv); |
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if (ret) |
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return ret; |
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} |
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for (i = 0; i < conv->chip_info->num_channels; i++) { |
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adi_axi_adc_write(st, ADI_AXI_REG_CHAN_CTRL(i), |
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ADI_AXI_REG_CHAN_CTRL_DEFAULTS); |
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} |
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return 0; |
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} |
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static void axi_adc_reset(struct adi_axi_adc_state *st) |
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{ |
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adi_axi_adc_write(st, ADI_AXI_REG_RSTN, 0); |
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mdelay(10); |
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adi_axi_adc_write(st, ADI_AXI_REG_RSTN, ADI_AXI_REG_RSTN_MMCM_RSTN); |
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mdelay(10); |
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adi_axi_adc_write(st, ADI_AXI_REG_RSTN, |
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ADI_AXI_REG_RSTN_RSTN | ADI_AXI_REG_RSTN_MMCM_RSTN); |
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} |
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static void adi_axi_adc_cleanup(void *data) |
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{ |
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struct adi_axi_adc_client *cl = data; |
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put_device(cl->dev); |
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module_put(cl->dev->driver->owner); |
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} |
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static int adi_axi_adc_probe(struct platform_device *pdev) |
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{ |
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struct adi_axi_adc_conv *conv; |
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struct iio_dev *indio_dev; |
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struct adi_axi_adc_client *cl; |
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struct adi_axi_adc_state *st; |
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unsigned int ver; |
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int ret; |
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cl = adi_axi_adc_attach_client(&pdev->dev); |
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if (IS_ERR(cl)) |
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return PTR_ERR(cl); |
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ret = devm_add_action_or_reset(&pdev->dev, adi_axi_adc_cleanup, cl); |
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if (ret) |
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return ret; |
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indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*st)); |
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if (indio_dev == NULL) |
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return -ENOMEM; |
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st = iio_priv(indio_dev); |
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st->client = cl; |
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cl->state = st; |
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mutex_init(&st->lock); |
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st->regs = devm_platform_ioremap_resource(pdev, 0); |
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if (IS_ERR(st->regs)) |
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return PTR_ERR(st->regs); |
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conv = &st->client->conv; |
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axi_adc_reset(st); |
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ver = adi_axi_adc_read(st, ADI_AXI_REG_VERSION); |
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if (cl->info->version > ver) { |
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dev_err(&pdev->dev, |
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"IP core version is too old. Expected %d.%.2d.%c, Reported %d.%.2d.%c\n", |
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ADI_AXI_PCORE_VER_MAJOR(cl->info->version), |
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ADI_AXI_PCORE_VER_MINOR(cl->info->version), |
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ADI_AXI_PCORE_VER_PATCH(cl->info->version), |
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ADI_AXI_PCORE_VER_MAJOR(ver), |
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ADI_AXI_PCORE_VER_MINOR(ver), |
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ADI_AXI_PCORE_VER_PATCH(ver)); |
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return -ENODEV; |
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} |
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indio_dev->info = &adi_axi_adc_info; |
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indio_dev->name = "adi-axi-adc"; |
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indio_dev->modes = INDIO_DIRECT_MODE; |
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indio_dev->num_channels = conv->chip_info->num_channels; |
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indio_dev->channels = conv->chip_info->channels; |
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ret = adi_axi_adc_config_dma_buffer(&pdev->dev, indio_dev); |
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if (ret) |
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return ret; |
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ret = adi_axi_adc_setup_channels(&pdev->dev, st); |
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if (ret) |
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return ret; |
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ret = devm_iio_device_register(&pdev->dev, indio_dev); |
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if (ret) |
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return ret; |
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dev_info(&pdev->dev, "AXI ADC IP core (%d.%.2d.%c) probed\n", |
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ADI_AXI_PCORE_VER_MAJOR(ver), |
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ADI_AXI_PCORE_VER_MINOR(ver), |
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ADI_AXI_PCORE_VER_PATCH(ver)); |
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return 0; |
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} |
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/* Match table for of_platform binding */ |
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static const struct of_device_id adi_axi_adc_of_match[] = { |
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{ .compatible = "adi,axi-adc-10.0.a", .data = &adi_axi_adc_10_0_a_info }, |
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{ /* end of list */ } |
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}; |
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MODULE_DEVICE_TABLE(of, adi_axi_adc_of_match); |
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static struct platform_driver adi_axi_adc_driver = { |
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.driver = { |
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.name = KBUILD_MODNAME, |
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.of_match_table = adi_axi_adc_of_match, |
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}, |
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.probe = adi_axi_adc_probe, |
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}; |
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module_platform_driver(adi_axi_adc_driver); |
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MODULE_AUTHOR("Michael Hennerich <[email protected]>"); |
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MODULE_DESCRIPTION("Analog Devices Generic AXI ADC IP core driver"); |
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MODULE_LICENSE("GPL v2");
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