From f70575805708cabdedea7498aaa3f710fde4d920 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Wed, 31 Jan 2024 03:29:01 +0000
Subject: [PATCH] add lvds1024*800
---
kernel/drivers/iio/dac/ad7303.c | 48 ++++++++++++++++++++++--------------------------
1 files changed, 22 insertions(+), 26 deletions(-)
diff --git a/kernel/drivers/iio/dac/ad7303.c b/kernel/drivers/iio/dac/ad7303.c
index 8f3bd19..2e46def 100644
--- a/kernel/drivers/iio/dac/ad7303.c
+++ b/kernel/drivers/iio/dac/ad7303.c
@@ -1,19 +1,18 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* AD7303 Digital to analog converters driver
*
* Copyright 2013 Analog Devices Inc.
- *
- * Licensed under the GPL-2.
*/
#include <linux/err.h>
#include <linux/module.h>
+#include <linux/mod_devicetable.h>
#include <linux/kernel.h>
#include <linux/spi/spi.h>
#include <linux/slab.h>
#include <linux/sysfs.h>
#include <linux/regulator/consumer.h>
-#include <linux/of.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
@@ -31,6 +30,9 @@
* @spi: the device for this driver instance
* @config: cached config register value
* @dac_cache: current DAC raw value (chip does not support readback)
+ * @vdd_reg: reference to VDD regulator
+ * @vref_reg: reference to VREF regulator
+ * @lock: protect writes and cache updates
* @data: spi transfer buffer
*/
@@ -42,6 +44,7 @@
struct regulator *vdd_reg;
struct regulator *vref_reg;
+ struct mutex lock;
/*
* DMA (thus cache coherency maintenance) requires the
* transfer buffers to live in their own cache lines.
@@ -80,7 +83,7 @@
if (ret)
return ret;
- mutex_lock(&indio_dev->mlock);
+ mutex_lock(&st->lock);
if (pwr_down)
st->config |= AD7303_CFG_POWER_DOWN(chan->channel);
@@ -91,7 +94,7 @@
* mode, so just write one of the DAC channels again */
ad7303_write(st, chan->channel, st->dac_cache[chan->channel]);
- mutex_unlock(&indio_dev->mlock);
+ mutex_unlock(&st->lock);
return len;
}
@@ -117,7 +120,9 @@
switch (info) {
case IIO_CHAN_INFO_RAW:
+ mutex_lock(&st->lock);
*val = st->dac_cache[chan->channel];
+ mutex_unlock(&st->lock);
return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
vref_uv = ad7303_get_vref(st, chan);
@@ -145,11 +150,11 @@
if (val >= (1 << chan->scan_type.realbits) || val < 0)
return -EINVAL;
- mutex_lock(&indio_dev->mlock);
+ mutex_lock(&st->lock);
ret = ad7303_write(st, chan->address, val);
if (ret == 0)
st->dac_cache[chan->channel] = val;
- mutex_unlock(&indio_dev->mlock);
+ mutex_unlock(&st->lock);
break;
default:
ret = -EINVAL;
@@ -200,7 +205,6 @@
const struct spi_device_id *id = spi_get_device_id(spi);
struct iio_dev *indio_dev;
struct ad7303_state *st;
- bool ext_ref;
int ret;
indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
@@ -212,6 +216,8 @@
st->spi = spi;
+ mutex_init(&st->lock);
+
st->vdd_reg = devm_regulator_get(&spi->dev, "Vdd");
if (IS_ERR(st->vdd_reg))
return PTR_ERR(st->vdd_reg);
@@ -220,24 +226,15 @@
if (ret)
return ret;
- if (spi->dev.of_node) {
- ext_ref = of_property_read_bool(spi->dev.of_node,
- "REF-supply");
- } else {
- struct ad7303_platform_data *pdata = spi->dev.platform_data;
- if (pdata && pdata->use_external_ref)
- ext_ref = true;
- else
- ext_ref = false;
+ st->vref_reg = devm_regulator_get_optional(&spi->dev, "REF");
+ if (IS_ERR(st->vref_reg)) {
+ ret = PTR_ERR(st->vref_reg);
+ if (ret != -ENODEV)
+ goto err_disable_vdd_reg;
+ st->vref_reg = NULL;
}
- if (ext_ref) {
- st->vref_reg = devm_regulator_get(&spi->dev, "REF");
- if (IS_ERR(st->vref_reg)) {
- ret = PTR_ERR(st->vref_reg);
- goto err_disable_vdd_reg;
- }
-
+ if (st->vref_reg) {
ret = regulator_enable(st->vref_reg);
if (ret)
goto err_disable_vdd_reg;
@@ -245,7 +242,6 @@
st->config |= AD7303_CFG_EXTERNAL_VREF;
}
- indio_dev->dev.parent = &spi->dev;
indio_dev->name = id->name;
indio_dev->info = &ad7303_info;
indio_dev->modes = INDIO_DIRECT_MODE;
@@ -295,7 +291,7 @@
static struct spi_driver ad7303_driver = {
.driver = {
.name = "ad7303",
- .of_match_table = of_match_ptr(ad7303_spi_of_match),
+ .of_match_table = ad7303_spi_of_match,
},
.probe = ad7303_probe,
.remove = ad7303_remove,
--
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