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path: root/drivers/staging/iio/meter/ade7854-spi.c
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-rw-r--r--drivers/staging/iio/meter/ade7854-spi.c360
1 files changed, 360 insertions, 0 deletions
diff --git a/drivers/staging/iio/meter/ade7854-spi.c b/drivers/staging/iio/meter/ade7854-spi.c
new file mode 100644
index 000000000000..fe58103ed4ca
--- /dev/null
+++ b/drivers/staging/iio/meter/ade7854-spi.c
@@ -0,0 +1,360 @@
+/*
+ * ADE7854/58/68/78 Polyphase Multifunction Energy Metering IC Driver (SPI Bus)
+ *
+ * Copyright 2010 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/spi/spi.h>
+#include <linux/slab.h>
+
+#include "../iio.h"
+#include "ade7854.h"
+
+static int ade7854_spi_write_reg_8(struct device *dev,
+ u16 reg_address,
+ u8 value)
+{
+ int ret;
+ struct spi_message msg;
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct ade7854_state *st = iio_dev_get_devdata(indio_dev);
+ struct spi_transfer xfers[] = {
+ {
+ .tx_buf = st->tx,
+ .bits_per_word = 8,
+ .len = 4,
+ }
+ };
+
+ mutex_lock(&st->buf_lock);
+ st->tx[0] = ADE7854_WRITE_REG;
+ st->tx[1] = (reg_address >> 8) & 0xFF;
+ st->tx[2] = reg_address & 0xFF;
+ st->tx[3] = value & 0xFF;
+
+ spi_message_init(&msg);
+ spi_message_add_tail(xfers, &msg);
+ ret = spi_sync(st->spi, &msg);
+ mutex_unlock(&st->buf_lock);
+
+ return ret;
+}
+
+static int ade7854_spi_write_reg_16(struct device *dev,
+ u16 reg_address,
+ u16 value)
+{
+ int ret;
+ struct spi_message msg;
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct ade7854_state *st = iio_dev_get_devdata(indio_dev);
+ struct spi_transfer xfers[] = {
+ {
+ .tx_buf = st->tx,
+ .bits_per_word = 8,
+ .len = 5,
+ }
+ };
+
+ mutex_lock(&st->buf_lock);
+ st->tx[0] = ADE7854_WRITE_REG;
+ st->tx[1] = (reg_address >> 8) & 0xFF;
+ st->tx[2] = reg_address & 0xFF;
+ st->tx[3] = (value >> 8) & 0xFF;
+ st->tx[4] = value & 0xFF;
+
+ spi_message_init(&msg);
+ spi_message_add_tail(xfers, &msg);
+ ret = spi_sync(st->spi, &msg);
+ mutex_unlock(&st->buf_lock);
+
+ return ret;
+}
+
+static int ade7854_spi_write_reg_24(struct device *dev,
+ u16 reg_address,
+ u32 value)
+{
+ int ret;
+ struct spi_message msg;
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct ade7854_state *st = iio_dev_get_devdata(indio_dev);
+ struct spi_transfer xfers[] = {
+ {
+ .tx_buf = st->tx,
+ .bits_per_word = 8,
+ .len = 6,
+ }
+ };
+
+ mutex_lock(&st->buf_lock);
+ st->tx[0] = ADE7854_WRITE_REG;
+ st->tx[1] = (reg_address >> 8) & 0xFF;
+ st->tx[2] = reg_address & 0xFF;
+ st->tx[3] = (value >> 16) & 0xFF;
+ st->tx[4] = (value >> 8) & 0xFF;
+ st->tx[5] = value & 0xFF;
+
+ spi_message_init(&msg);
+ spi_message_add_tail(xfers, &msg);
+ ret = spi_sync(st->spi, &msg);
+ mutex_unlock(&st->buf_lock);
+
+ return ret;
+}
+
+static int ade7854_spi_write_reg_32(struct device *dev,
+ u16 reg_address,
+ u32 value)
+{
+ int ret;
+ struct spi_message msg;
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct ade7854_state *st = iio_dev_get_devdata(indio_dev);
+ struct spi_transfer xfers[] = {
+ {
+ .tx_buf = st->tx,
+ .bits_per_word = 8,
+ .len = 7,
+ }
+ };
+
+ mutex_lock(&st->buf_lock);
+ st->tx[0] = ADE7854_WRITE_REG;
+ st->tx[1] = (reg_address >> 8) & 0xFF;
+ st->tx[2] = reg_address & 0xFF;
+ st->tx[3] = (value >> 24) & 0xFF;
+ st->tx[4] = (value >> 16) & 0xFF;
+ st->tx[5] = (value >> 8) & 0xFF;
+ st->tx[6] = value & 0xFF;
+
+ spi_message_init(&msg);
+ spi_message_add_tail(xfers, &msg);
+ ret = spi_sync(st->spi, &msg);
+ mutex_unlock(&st->buf_lock);
+
+ return ret;
+}
+
+static int ade7854_spi_read_reg_8(struct device *dev,
+ u16 reg_address,
+ u8 *val)
+{
+ struct spi_message msg;
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct ade7854_state *st = iio_dev_get_devdata(indio_dev);
+ int ret;
+ struct spi_transfer xfers[] = {
+ {
+ .tx_buf = st->tx,
+ .bits_per_word = 8,
+ .len = 4,
+ },
+ };
+
+ mutex_lock(&st->buf_lock);
+
+ st->tx[0] = ADE7854_READ_REG;
+ st->tx[1] = (reg_address >> 8) & 0xFF;
+ st->tx[2] = reg_address & 0xFF;
+ st->tx[3] = 0;
+
+ spi_message_init(&msg);
+ spi_message_add_tail(xfers, &msg);
+ ret = spi_sync(st->spi, &msg);
+ if (ret) {
+ dev_err(&st->spi->dev, "problem when reading 8 bit register 0x%02X",
+ reg_address);
+ goto error_ret;
+ }
+ *val = st->rx[3];
+
+error_ret:
+ mutex_unlock(&st->buf_lock);
+ return ret;
+}
+
+static int ade7854_spi_read_reg_16(struct device *dev,
+ u16 reg_address,
+ u16 *val)
+{
+ struct spi_message msg;
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct ade7854_state *st = iio_dev_get_devdata(indio_dev);
+ int ret;
+ struct spi_transfer xfers[] = {
+ {
+ .tx_buf = st->tx,
+ .bits_per_word = 8,
+ .len = 5,
+ },
+ };
+
+ mutex_lock(&st->buf_lock);
+ st->tx[0] = ADE7854_READ_REG;
+ st->tx[1] = (reg_address >> 8) & 0xFF;
+ st->tx[2] = reg_address & 0xFF;
+ st->tx[3] = 0;
+ st->tx[4] = 0;
+
+ spi_message_init(&msg);
+ spi_message_add_tail(xfers, &msg);
+ ret = spi_sync(st->spi, &msg);
+ if (ret) {
+ dev_err(&st->spi->dev, "problem when reading 16 bit register 0x%02X",
+ reg_address);
+ goto error_ret;
+ }
+ *val = (st->rx[3] << 8) | st->rx[4];
+
+error_ret:
+ mutex_unlock(&st->buf_lock);
+ return ret;
+}
+
+static int ade7854_spi_read_reg_24(struct device *dev,
+ u16 reg_address,
+ u32 *val)
+{
+ struct spi_message msg;
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct ade7854_state *st = iio_dev_get_devdata(indio_dev);
+ int ret;
+ struct spi_transfer xfers[] = {
+ {
+ .tx_buf = st->tx,
+ .bits_per_word = 8,
+ .len = 6,
+ },
+ };
+
+ mutex_lock(&st->buf_lock);
+
+ st->tx[0] = ADE7854_READ_REG;
+ st->tx[1] = (reg_address >> 8) & 0xFF;
+ st->tx[2] = reg_address & 0xFF;
+ st->tx[3] = 0;
+ st->tx[4] = 0;
+ st->tx[5] = 0;
+
+ spi_message_init(&msg);
+ spi_message_add_tail(xfers, &msg);
+ ret = spi_sync(st->spi, &msg);
+ if (ret) {
+ dev_err(&st->spi->dev, "problem when reading 24 bit register 0x%02X",
+ reg_address);
+ goto error_ret;
+ }
+ *val = (st->rx[3] << 16) | (st->rx[4] << 8) | st->rx[5];
+
+error_ret:
+ mutex_unlock(&st->buf_lock);
+ return ret;
+}
+
+static int ade7854_spi_read_reg_32(struct device *dev,
+ u16 reg_address,
+ u32 *val)
+{
+ struct spi_message msg;
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct ade7854_state *st = iio_dev_get_devdata(indio_dev);
+ int ret;
+ struct spi_transfer xfers[] = {
+ {
+ .tx_buf = st->tx,
+ .bits_per_word = 8,
+ .len = 7,
+ },
+ };
+
+ mutex_lock(&st->buf_lock);
+
+ st->tx[0] = ADE7854_READ_REG;
+ st->tx[1] = (reg_address >> 8) & 0xFF;
+ st->tx[2] = reg_address & 0xFF;
+ st->tx[3] = 0;
+ st->tx[4] = 0;
+ st->tx[5] = 0;
+ st->tx[6] = 0;
+
+ spi_message_init(&msg);
+ spi_message_add_tail(xfers, &msg);
+ ret = spi_sync(st->spi, &msg);
+ if (ret) {
+ dev_err(&st->spi->dev, "problem when reading 32 bit register 0x%02X",
+ reg_address);
+ goto error_ret;
+ }
+ *val = (st->rx[3] << 24) | (st->rx[4] << 16) | (st->rx[5] << 8) | st->rx[6];
+
+error_ret:
+ mutex_unlock(&st->buf_lock);
+ return ret;
+}
+
+static int __devinit ade7854_spi_probe(struct spi_device *spi)
+{
+ int ret;
+ struct ade7854_state *st = kzalloc(sizeof *st, GFP_KERNEL);
+ if (!st) {
+ ret = -ENOMEM;
+ return ret;
+ }
+
+ spi_set_drvdata(spi, st);
+ st->read_reg_8 = ade7854_spi_read_reg_8;
+ st->read_reg_16 = ade7854_spi_read_reg_16;
+ st->read_reg_24 = ade7854_spi_read_reg_24;
+ st->read_reg_32 = ade7854_spi_read_reg_32;
+ st->write_reg_8 = ade7854_spi_write_reg_8;
+ st->write_reg_16 = ade7854_spi_write_reg_16;
+ st->write_reg_24 = ade7854_spi_write_reg_24;
+ st->write_reg_32 = ade7854_spi_write_reg_32;
+ st->irq = spi->irq;
+ st->spi = spi;
+
+ ret = ade7854_probe(st, &spi->dev);
+ if (ret) {
+ kfree(st);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int ade7854_spi_remove(struct spi_device *spi)
+{
+ ade7854_remove(spi_get_drvdata(spi));
+
+ return 0;
+}
+
+static struct spi_driver ade7854_driver = {
+ .driver = {
+ .name = "ade7854",
+ .owner = THIS_MODULE,
+ },
+ .probe = ade7854_spi_probe,
+ .remove = __devexit_p(ade7854_spi_remove),
+};
+
+static __init int ade7854_init(void)
+{
+ return spi_register_driver(&ade7854_driver);
+}
+module_init(ade7854_init);
+
+static __exit void ade7854_exit(void)
+{
+ spi_unregister_driver(&ade7854_driver);
+}
+module_exit(ade7854_exit);
+
+MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
+MODULE_DESCRIPTION("Analog Devices ADE7854/58/68/78 Polyphase Multifunction Energy Metering IC SPI Driver");
+MODULE_LICENSE("GPL v2");
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.