From 9d77db3c730780c8ef5ccd4b66403ff5675cfe4e Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Mon, 13 May 2024 10:30:14 +0000
Subject: [PATCH] modify sin led gpio
---
kernel/drivers/iio/adc/ad7476.c | 102 +++++++++++++++++++++++++++++++++++---------------
1 files changed, 71 insertions(+), 31 deletions(-)
diff --git a/kernel/drivers/iio/adc/ad7476.c b/kernel/drivers/iio/adc/ad7476.c
index fbaae47..bf55726 100644
--- a/kernel/drivers/iio/adc/ad7476.c
+++ b/kernel/drivers/iio/adc/ad7476.c
@@ -12,9 +12,11 @@
#include <linux/sysfs.h>
#include <linux/spi/spi.h>
#include <linux/regulator/consumer.h>
+#include <linux/gpio/consumer.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/bitops.h>
+#include <linux/delay.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
@@ -27,6 +29,8 @@
struct ad7476_chip_info {
unsigned int int_vref_uv;
struct iio_chan_spec channel[2];
+ /* channels used when convst gpio is defined */
+ struct iio_chan_spec convst_channel[2];
void (*reset)(struct ad7476_state *);
};
@@ -34,6 +38,7 @@
struct spi_device *spi;
const struct ad7476_chip_info *chip_info;
struct regulator *reg;
+ struct gpio_desc *convst_gpio;
struct spi_transfer xfer;
struct spi_message msg;
/*
@@ -59,7 +64,21 @@
ID_ADC081S,
ID_ADC101S,
ID_ADC121S,
+ ID_ADS7866,
+ ID_ADS7867,
+ ID_ADS7868,
};
+
+static void ad7091_convst(struct ad7476_state *st)
+{
+ if (!st->convst_gpio)
+ return;
+
+ gpiod_set_value(st->convst_gpio, 0);
+ udelay(1); /* CONVST pulse width: 10 ns min */
+ gpiod_set_value(st->convst_gpio, 1);
+ udelay(1); /* Conversion time: 650 ns max */
+}
static irqreturn_t ad7476_trigger_handler(int irq, void *p)
{
@@ -67,6 +86,8 @@
struct iio_dev *indio_dev = pf->indio_dev;
struct ad7476_state *st = iio_priv(indio_dev);
int b_sent;
+
+ ad7091_convst(st);
b_sent = spi_sync(st->spi, &st->msg);
if (b_sent < 0)
@@ -89,6 +110,8 @@
static int ad7476_scan_direct(struct ad7476_state *st)
{
int ret;
+
+ ad7091_convst(st);
ret = spi_sync(st->spi, &st->msg);
if (ret)
@@ -157,11 +180,17 @@
#define AD7940_CHAN(bits) _AD7476_CHAN((bits), 15 - (bits), \
BIT(IIO_CHAN_INFO_RAW))
#define AD7091R_CHAN(bits) _AD7476_CHAN((bits), 16 - (bits), 0)
+#define AD7091R_CONVST_CHAN(bits) _AD7476_CHAN((bits), 16 - (bits), \
+ BIT(IIO_CHAN_INFO_RAW))
+#define ADS786X_CHAN(bits) _AD7476_CHAN((bits), 12 - (bits), \
+ BIT(IIO_CHAN_INFO_RAW))
static const struct ad7476_chip_info ad7476_chip_info_tbl[] = {
[ID_AD7091R] = {
.channel[0] = AD7091R_CHAN(12),
.channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1),
+ .convst_channel[0] = AD7091R_CONVST_CHAN(12),
+ .convst_channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1),
.reset = ad7091_reset,
},
[ID_AD7276] = {
@@ -209,11 +238,30 @@
.channel[0] = ADC081S_CHAN(12),
.channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1),
},
+ [ID_ADS7866] = {
+ .channel[0] = ADS786X_CHAN(12),
+ .channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1),
+ },
+ [ID_ADS7867] = {
+ .channel[0] = ADS786X_CHAN(10),
+ .channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1),
+ },
+ [ID_ADS7868] = {
+ .channel[0] = ADS786X_CHAN(8),
+ .channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1),
+ },
};
static const struct iio_info ad7476_info = {
.read_raw = &ad7476_read_raw,
};
+
+static void ad7476_reg_disable(void *data)
+{
+ struct ad7476_state *st = data;
+
+ regulator_disable(st->reg);
+}
static int ad7476_probe(struct spi_device *spi)
{
@@ -237,18 +285,29 @@
if (ret)
return ret;
+ ret = devm_add_action_or_reset(&spi->dev, ad7476_reg_disable,
+ st);
+ if (ret)
+ return ret;
+
+ st->convst_gpio = devm_gpiod_get_optional(&spi->dev,
+ "adi,conversion-start",
+ GPIOD_OUT_LOW);
+ if (IS_ERR(st->convst_gpio))
+ return PTR_ERR(st->convst_gpio);
+
spi_set_drvdata(spi, indio_dev);
st->spi = spi;
- /* Establish that the iio_dev is a child of the spi device */
- indio_dev->dev.parent = &spi->dev;
- indio_dev->dev.of_node = spi->dev.of_node;
indio_dev->name = spi_get_device_id(spi)->name;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->channels = st->chip_info->channel;
indio_dev->num_channels = 2;
indio_dev->info = &ad7476_info;
+
+ if (st->convst_gpio)
+ indio_dev->channels = st->chip_info->convst_channel;
/* Setup default message */
st->xfer.rx_buf = &st->data;
@@ -257,40 +316,19 @@
spi_message_init(&st->msg);
spi_message_add_tail(&st->xfer, &st->msg);
- ret = iio_triggered_buffer_setup(indio_dev, NULL,
- &ad7476_trigger_handler, NULL);
+ ret = devm_iio_triggered_buffer_setup(&spi->dev, indio_dev, NULL,
+ &ad7476_trigger_handler, NULL);
if (ret)
- goto error_disable_reg;
+ return ret;
if (st->chip_info->reset)
st->chip_info->reset(st);
- ret = iio_device_register(indio_dev);
- if (ret)
- goto error_ring_unregister;
- return 0;
-
-error_ring_unregister:
- iio_triggered_buffer_cleanup(indio_dev);
-error_disable_reg:
- regulator_disable(st->reg);
-
- return ret;
-}
-
-static int ad7476_remove(struct spi_device *spi)
-{
- struct iio_dev *indio_dev = spi_get_drvdata(spi);
- struct ad7476_state *st = iio_priv(indio_dev);
-
- iio_device_unregister(indio_dev);
- iio_triggered_buffer_cleanup(indio_dev);
- regulator_disable(st->reg);
-
- return 0;
+ return devm_iio_device_register(&spi->dev, indio_dev);
}
static const struct spi_device_id ad7476_id[] = {
+ {"ad7091", ID_AD7091R},
{"ad7091r", ID_AD7091R},
{"ad7273", ID_AD7277},
{"ad7274", ID_AD7276},
@@ -314,6 +352,9 @@
{"adc081s", ID_ADC081S},
{"adc101s", ID_ADC101S},
{"adc121s", ID_ADC121S},
+ {"ads7866", ID_ADS7866},
+ {"ads7867", ID_ADS7867},
+ {"ads7868", ID_ADS7868},
{}
};
MODULE_DEVICE_TABLE(spi, ad7476_id);
@@ -323,11 +364,10 @@
.name = "ad7476",
},
.probe = ad7476_probe,
- .remove = ad7476_remove,
.id_table = ad7476_id,
};
module_spi_driver(ad7476_driver);
-MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
+MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
MODULE_DESCRIPTION("Analog Devices AD7476 and similar 1-channel ADCs");
MODULE_LICENSE("GPL v2");
--
Gitblit v1.6.2