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-rw-r--r--drivers/iio/imu/adis.c70
-rw-r--r--drivers/iio/imu/adis_buffer.c15
-rw-r--r--include/linux/iio/imu/adis.h10
3 files changed, 77 insertions, 18 deletions
diff --git a/drivers/iio/imu/adis.c b/drivers/iio/imu/adis.c
index 280a49584ad..c4ea04ffa60 100644
--- a/drivers/iio/imu/adis.c
+++ b/drivers/iio/imu/adis.c
@@ -30,6 +30,7 @@
int adis_write_reg(struct adis *adis, unsigned int reg,
unsigned int value, unsigned int size)
{
+ unsigned int page = reg / ADIS_PAGE_SIZE;
int ret, i;
struct spi_message msg;
struct spi_transfer xfers[] = {
@@ -56,39 +57,53 @@ int adis_write_reg(struct adis *adis, unsigned int reg,
.bits_per_word = 8,
.len = 2,
.delay_usecs = adis->data->write_delay,
+ }, {
+ .tx_buf = adis->tx + 8,
+ .bits_per_word = 8,
+ .len = 2,
+ .delay_usecs = adis->data->write_delay,
},
};
mutex_lock(&adis->txrx_lock);
spi_message_init(&msg);
+
+ if (adis->current_page != page) {
+ adis->tx[0] = ADIS_WRITE_REG(ADIS_REG_PAGE_ID);
+ adis->tx[1] = page;
+ spi_message_add_tail(&xfers[0], &msg);
+ }
+
switch (size) {
case 4:
- adis->tx[6] = ADIS_WRITE_REG(reg + 3);
- adis->tx[7] = (value >> 24) & 0xff;
- adis->tx[4] = ADIS_WRITE_REG(reg + 2);
- adis->tx[5] = (value >> 16) & 0xff;
+ adis->tx[8] = ADIS_WRITE_REG(reg + 3);
+ adis->tx[9] = (value >> 24) & 0xff;
+ adis->tx[6] = ADIS_WRITE_REG(reg + 2);
+ adis->tx[7] = (value >> 16) & 0xff;
case 2:
- adis->tx[2] = ADIS_WRITE_REG(reg + 1);
- adis->tx[3] = (value >> 8) & 0xff;
+ adis->tx[4] = ADIS_WRITE_REG(reg + 1);
+ adis->tx[5] = (value >> 8) & 0xff;
case 1:
- adis->tx[0] = ADIS_WRITE_REG(reg);
- adis->tx[1] = value & 0xff;
+ adis->tx[2] = ADIS_WRITE_REG(reg);
+ adis->tx[3] = value & 0xff;
break;
default:
ret = -EINVAL;
goto out_unlock;
}
- xfers[size - 1].cs_change = 0;
+ xfers[size].cs_change = 0;
- for (i = 0; i < size; i++)
+ for (i = 1; i <= size; i++)
spi_message_add_tail(&xfers[i], &msg);
ret = spi_sync(adis->spi, &msg);
if (ret) {
dev_err(&adis->spi->dev, "Failed to write register 0x%02X: %d\n",
reg, ret);
+ } else {
+ adis->current_page = page;
}
out_unlock:
@@ -107,6 +122,7 @@ EXPORT_SYMBOL_GPL(adis_write_reg);
int adis_read_reg(struct adis *adis, unsigned int reg,
unsigned int *val, unsigned int size)
{
+ unsigned int page = reg / ADIS_PAGE_SIZE;
struct spi_message msg;
int ret;
struct spi_transfer xfers[] = {
@@ -115,9 +131,15 @@ int adis_read_reg(struct adis *adis, unsigned int reg,
.bits_per_word = 8,
.len = 2,
.cs_change = 1,
- .delay_usecs = adis->data->read_delay,
+ .delay_usecs = adis->data->write_delay,
}, {
.tx_buf = adis->tx + 2,
+ .bits_per_word = 8,
+ .len = 2,
+ .cs_change = 1,
+ .delay_usecs = adis->data->read_delay,
+ }, {
+ .tx_buf = adis->tx + 4,
.rx_buf = adis->rx,
.bits_per_word = 8,
.len = 2,
@@ -134,16 +156,22 @@ int adis_read_reg(struct adis *adis, unsigned int reg,
mutex_lock(&adis->txrx_lock);
spi_message_init(&msg);
+ if (adis->current_page != page) {
+ adis->tx[0] = ADIS_WRITE_REG(ADIS_REG_PAGE_ID);
+ adis->tx[1] = page;
+ spi_message_add_tail(&xfers[0], &msg);
+ }
+
switch (size) {
case 4:
- adis->tx[0] = ADIS_READ_REG(reg + 2);
- adis->tx[1] = 0;
- spi_message_add_tail(&xfers[0], &msg);
- case 2:
- adis->tx[2] = ADIS_READ_REG(reg);
+ adis->tx[2] = ADIS_READ_REG(reg + 2);
adis->tx[3] = 0;
spi_message_add_tail(&xfers[1], &msg);
+ case 2:
+ adis->tx[4] = ADIS_READ_REG(reg);
+ adis->tx[5] = 0;
spi_message_add_tail(&xfers[2], &msg);
+ spi_message_add_tail(&xfers[3], &msg);
break;
default:
ret = -EINVAL;
@@ -155,6 +183,8 @@ int adis_read_reg(struct adis *adis, unsigned int reg,
dev_err(&adis->spi->dev, "Failed to read register 0x%02X: %d\n",
reg, ret);
goto out_unlock;
+ } else {
+ adis->current_page = page;
}
switch (size) {
@@ -390,6 +420,14 @@ int adis_init(struct adis *adis, struct iio_dev *indio_dev,
adis->data = data;
iio_device_set_drvdata(indio_dev, adis);
+ if (data->has_paging) {
+ /* Need to set the page before first read/write */
+ adis->current_page = -1;
+ } else {
+ /* Page will always be 0 */
+ adis->current_page = 0;
+ }
+
return adis_enable_irq(adis, false);
}
EXPORT_SYMBOL_GPL(adis_init);
diff --git a/drivers/iio/imu/adis_buffer.c b/drivers/iio/imu/adis_buffer.c
index 785713349e9..99d8e0b0dd3 100644
--- a/drivers/iio/imu/adis_buffer.c
+++ b/drivers/iio/imu/adis_buffer.c
@@ -83,10 +83,25 @@ static irqreturn_t adis_trigger_handler(int irq, void *p)
if (!adis->buffer)
return -ENOMEM;
+ if (adis->data->has_paging) {
+ mutex_lock(&adis->txrx_lock);
+ if (adis->current_page != 0) {
+ adis->tx[0] = ADIS_WRITE_REG(ADIS_REG_PAGE_ID);
+ adis->tx[1] = 0;
+ spi_write(adis->spi, adis->tx, 2);
+ }
+ }
+
ret = spi_sync(adis->spi, &adis->msg);
if (ret)
dev_err(&adis->spi->dev, "Failed to read data: %d", ret);
+
+ if (adis->data->has_paging) {
+ adis->current_page = 0;
+ mutex_unlock(&adis->txrx_lock);
+ }
+
/* Guaranteed to be aligned with 8 byte boundary */
if (indio_dev->scan_timestamp) {
void *b = adis->buffer + indio_dev->scan_bytes - sizeof(s64);
diff --git a/include/linux/iio/imu/adis.h b/include/linux/iio/imu/adis.h
index 6402a08c0e6..e82cd0827e9 100644
--- a/include/linux/iio/imu/adis.h
+++ b/include/linux/iio/imu/adis.h
@@ -14,8 +14,11 @@
#include <linux/interrupt.h>
#include <linux/iio/types.h>
-#define ADIS_WRITE_REG(reg) (0x80 | (reg))
-#define ADIS_READ_REG(reg) (reg)
+#define ADIS_WRITE_REG(reg) ((0x80 | (reg)))
+#define ADIS_READ_REG(reg) ((reg) & 0x7f)
+
+#define ADIS_PAGE_SIZE 0x80
+#define ADIS_REG_PAGE_ID 0x00
/**
* struct adis_data - ADIS chip variant specific data
@@ -40,6 +43,8 @@ struct adis_data {
const char * const *status_error_msgs;
unsigned int status_error_mask;
+
+ bool has_paging;
};
struct adis {
@@ -51,6 +56,7 @@ struct adis {
struct mutex txrx_lock;
struct spi_message msg;
struct spi_transfer *xfer;
+ unsigned int current_page;
void *buffer;
uint8_t tx[10] ____cacheline_aligned;
generated by cgit v1.2.3-70-g09d2 (git 2.51.2) at 2025-11-04 11:25:15 +0000