From 95099d4622f8cb224d94e314c7a8e0df60b13f87 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Sat, 09 Dec 2023 08:38:01 +0000
Subject: [PATCH] enable docker ppp
---
kernel/drivers/iio/chemical/ccs811.c | 148 +++++++++++++++++++++++++++++++++++++++----------
1 files changed, 117 insertions(+), 31 deletions(-)
diff --git a/kernel/drivers/iio/chemical/ccs811.c b/kernel/drivers/iio/chemical/ccs811.c
index 46d5d48..384d167 100644
--- a/kernel/drivers/iio/chemical/ccs811.c
+++ b/kernel/drivers/iio/chemical/ccs811.c
@@ -1,13 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* ccs811.c - Support for AMS CCS811 VOC Sensor
*
* Copyright (C) 2017 Narcisa Vasile <narcisaanamaria12@gmail.com>
*
* Datasheet: ams.com/content/download/951091/2269479/CCS811_DS000459_3-00.pdf
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
*
* IIO driver for AMS CCS811 (I2C address 0x5A/0x5B set by ADDR Low/High)
*
@@ -19,6 +16,7 @@
*/
#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/iio/iio.h>
#include <linux/iio/buffer.h>
@@ -39,6 +37,7 @@
#define CCS811_ERR 0xE0
/* Used to transition from boot to application mode */
#define CCS811_APP_START 0xF4
+#define CCS811_SW_RESET 0xFF
/* Status register flags */
#define CCS811_STATUS_ERROR BIT(0)
@@ -77,6 +76,7 @@
struct mutex lock; /* Protect readings */
struct ccs811_reading buffer;
struct iio_trigger *drdy_trig;
+ struct gpio_desc *wakeup_gpio;
bool drdy_trig_on;
/* Ensures correct alignment of timestamp if present */
struct {
@@ -174,9 +174,24 @@
CCS811_MODE_IAQ_1SEC);
}
+static void ccs811_set_wakeup(struct ccs811_data *data, bool enable)
+{
+ if (!data->wakeup_gpio)
+ return;
+
+ gpiod_set_value(data->wakeup_gpio, enable);
+
+ if (enable)
+ usleep_range(50, 60);
+ else
+ usleep_range(20, 30);
+}
+
static int ccs811_get_measurement(struct ccs811_data *data)
{
int ret, tries = 11;
+
+ ccs811_set_wakeup(data, true);
/* Maximum waiting time: 1s, as measurements are made every second */
while (tries-- > 0) {
@@ -191,9 +206,12 @@
if (!(ret & CCS811_STATUS_DATA_READY))
return -EIO;
- return i2c_smbus_read_i2c_block_data(data->client,
+ ret = i2c_smbus_read_i2c_block_data(data->client,
CCS811_ALG_RESULT_DATA, 8,
(char *)&data->buffer);
+ ccs811_set_wakeup(data, false);
+
+ return ret;
}
static int ccs811_read_raw(struct iio_dev *indio_dev,
@@ -344,6 +362,45 @@
return IRQ_HANDLED;
}
+static int ccs811_reset(struct i2c_client *client)
+{
+ struct gpio_desc *reset_gpio;
+ int ret;
+
+ reset_gpio = devm_gpiod_get_optional(&client->dev, "reset",
+ GPIOD_OUT_LOW);
+ if (IS_ERR(reset_gpio))
+ return PTR_ERR(reset_gpio);
+
+ /* Try to reset using nRESET pin if available else do SW reset */
+ if (reset_gpio) {
+ gpiod_set_value(reset_gpio, 1);
+ usleep_range(20, 30);
+ gpiod_set_value(reset_gpio, 0);
+ } else {
+ /*
+ * As per the datasheet, this sequence of values needs to be
+ * written to the SW_RESET register for triggering the soft
+ * reset in the device and placing it in boot mode.
+ */
+ static const u8 reset_seq[] = {
+ 0x11, 0xE5, 0x72, 0x8A,
+ };
+
+ ret = i2c_smbus_write_i2c_block_data(client, CCS811_SW_RESET,
+ sizeof(reset_seq), reset_seq);
+ if (ret < 0) {
+ dev_err(&client->dev, "Failed to reset sensor\n");
+ return ret;
+ }
+ }
+
+ /* tSTART delay required after reset */
+ usleep_range(1000, 2000);
+
+ return 0;
+}
+
static int ccs811_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
@@ -356,40 +413,62 @@
| I2C_FUNC_SMBUS_READ_I2C_BLOCK))
return -EOPNOTSUPP;
- /* Check hardware id (should be 0x81 for this family of devices) */
- ret = i2c_smbus_read_byte_data(client, CCS811_HW_ID);
- if (ret < 0)
- return ret;
-
- if (ret != CCS811_HW_ID_VALUE) {
- dev_err(&client->dev, "hardware id doesn't match CCS81x\n");
- return -ENODEV;
- }
-
- ret = i2c_smbus_read_byte_data(client, CCS811_HW_VERSION);
- if (ret < 0)
- return ret;
-
- if ((ret & CCS811_HW_VERSION_MASK) != CCS811_HW_VERSION_VALUE) {
- dev_err(&client->dev, "no CCS811 sensor\n");
- return -ENODEV;
- }
-
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
if (!indio_dev)
return -ENOMEM;
-
- ret = ccs811_setup(client);
- if (ret < 0)
- return ret;
data = iio_priv(indio_dev);
i2c_set_clientdata(client, indio_dev);
data->client = client;
+ data->wakeup_gpio = devm_gpiod_get_optional(&client->dev, "wakeup",
+ GPIOD_OUT_HIGH);
+ if (IS_ERR(data->wakeup_gpio))
+ return PTR_ERR(data->wakeup_gpio);
+
+ ccs811_set_wakeup(data, true);
+
+ ret = ccs811_reset(client);
+ if (ret) {
+ ccs811_set_wakeup(data, false);
+ return ret;
+ }
+
+ /* Check hardware id (should be 0x81 for this family of devices) */
+ ret = i2c_smbus_read_byte_data(client, CCS811_HW_ID);
+ if (ret < 0) {
+ ccs811_set_wakeup(data, false);
+ return ret;
+ }
+
+ if (ret != CCS811_HW_ID_VALUE) {
+ dev_err(&client->dev, "hardware id doesn't match CCS81x\n");
+ ccs811_set_wakeup(data, false);
+ return -ENODEV;
+ }
+
+ ret = i2c_smbus_read_byte_data(client, CCS811_HW_VERSION);
+ if (ret < 0) {
+ ccs811_set_wakeup(data, false);
+ return ret;
+ }
+
+ if ((ret & CCS811_HW_VERSION_MASK) != CCS811_HW_VERSION_VALUE) {
+ dev_err(&client->dev, "no CCS811 sensor\n");
+ ccs811_set_wakeup(data, false);
+ return -ENODEV;
+ }
+
+ ret = ccs811_setup(client);
+ if (ret < 0) {
+ ccs811_set_wakeup(data, false);
+ return ret;
+ }
+
+ ccs811_set_wakeup(data, false);
+
mutex_init(&data->lock);
- indio_dev->dev.parent = &client->dev;
indio_dev->name = id->name;
indio_dev->info = &ccs811_info;
indio_dev->modes = INDIO_DIRECT_MODE;
@@ -421,11 +500,11 @@
data->drdy_trig->dev.parent = &client->dev;
data->drdy_trig->ops = &ccs811_trigger_ops;
iio_trigger_set_drvdata(data->drdy_trig, indio_dev);
- indio_dev->trig = data->drdy_trig;
- iio_trigger_get(indio_dev->trig);
ret = iio_trigger_register(data->drdy_trig);
if (ret)
goto err_poweroff;
+
+ indio_dev->trig = iio_trigger_get(data->drdy_trig);
}
ret = iio_triggered_buffer_setup(indio_dev, NULL,
@@ -474,9 +553,16 @@
};
MODULE_DEVICE_TABLE(i2c, ccs811_id);
+static const struct of_device_id ccs811_dt_ids[] = {
+ { .compatible = "ams,ccs811" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, ccs811_dt_ids);
+
static struct i2c_driver ccs811_driver = {
.driver = {
.name = "ccs811",
+ .of_match_table = ccs811_dt_ids,
},
.probe = ccs811_probe,
.remove = ccs811_remove,
--
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