kernel: remove support for kernel 4.19

We use 5.4 on all targets by default, and 4.19 has never been released
in a stable version. There is no reason to keep it.

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>

1 files changed, 0 insertions, 454 deletions

diff --git a/target/linux/generic/backport-4.19/500-v5.1-iio-chemical-add-support-for-Sensirion-SPS30-sensor.patch b/target/linux/generic/backport-4.19/500-v5.1-iio-chemical-add-support-for-Sensirion-SPS30-sensor.patch
deleted file mode 100644
index d30c7c3cc1..0000000000
--- a/target/linux/generic/backport-4.19/500-v5.1-iio-chemical-add-support-for-Sensirion-SPS30-sensor.patch
+++ /dev/null
@@ -1,454 +0,0 @@
-From 232e0f6ddeaee104d64675fe7d0cc142cf955f35 Mon Sep 17 00:00:00 2001
-From: Tomasz Duszynski <tduszyns@gmail.com>
-Date: Fri, 14 Dec 2018 19:28:02 +0100
-Subject: [PATCH] iio: chemical: add support for Sensirion SPS30 sensor
-
-Add support for Sensirion SPS30 particulate matter sensor.
-
-Signed-off-by: Tomasz Duszynski <tduszyns@gmail.com>
-Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
----
- drivers/iio/chemical/Kconfig  |  11 +
- drivers/iio/chemical/Makefile |   1 +
- drivers/iio/chemical/sps30.c  | 407 ++++++++++++++++++++++++++++++++++
- 3 files changed, 419 insertions(+)
- create mode 100644 drivers/iio/chemical/sps30.c
-
---- a/drivers/iio/chemical/Kconfig
-+++ b/drivers/iio/chemical/Kconfig
-@@ -61,6 +61,17 @@ config IAQCORE
- 	  iAQ-Core Continuous/Pulsed VOC (Volatile Organic Compounds)
- 	  sensors
- 
-+config SPS30
-+	tristate "SPS30 particulate matter sensor"
-+	depends on I2C
-+	select CRC8
-+	help
-+	  Say Y here to build support for the Sensirion SPS30 particulate
-+	  matter sensor.
-+
-+	  To compile this driver as a module, choose M here: the module will
-+	  be called sps30.
-+
- config VZ89X
- 	tristate "SGX Sensortech MiCS VZ89X VOC sensor"
- 	depends on I2C
---- a/drivers/iio/chemical/Makefile
-+++ b/drivers/iio/chemical/Makefile
-@@ -9,4 +9,5 @@ obj-$(CONFIG_BME680_I2C) += bme680_i2c.o
- obj-$(CONFIG_BME680_SPI) += bme680_spi.o
- obj-$(CONFIG_CCS811)		+= ccs811.o
- obj-$(CONFIG_IAQCORE)		+= ams-iaq-core.o
-+obj-$(CONFIG_SPS30) += sps30.o
- obj-$(CONFIG_VZ89X)		+= vz89x.o
---- /dev/null
-+++ b/drivers/iio/chemical/sps30.c
-@@ -0,0 +1,407 @@
-+// SPDX-License-Identifier: GPL-2.0
-+/*
-+ * Sensirion SPS30 particulate matter sensor driver
-+ *
-+ * Copyright (c) Tomasz Duszynski <tduszyns@gmail.com>
-+ *
-+ * I2C slave address: 0x69
-+ *
-+ * TODO:
-+ *  - support for turning on fan cleaning
-+ *  - support for reading/setting auto cleaning interval
-+ */
-+
-+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-+
-+#include <asm/unaligned.h>
-+#include <linux/crc8.h>
-+#include <linux/delay.h>
-+#include <linux/i2c.h>
-+#include <linux/iio/buffer.h>
-+#include <linux/iio/iio.h>
-+#include <linux/iio/sysfs.h>
-+#include <linux/iio/trigger_consumer.h>
-+#include <linux/iio/triggered_buffer.h>
-+#include <linux/module.h>
-+
-+#define SPS30_CRC8_POLYNOMIAL 0x31
-+/* max number of bytes needed to store PM measurements or serial string */
-+#define SPS30_MAX_READ_SIZE 48
-+/* sensor measures reliably up to 3000 ug / m3 */
-+#define SPS30_MAX_PM 3000
-+
-+/* SPS30 commands */
-+#define SPS30_START_MEAS 0x0010
-+#define SPS30_STOP_MEAS 0x0104
-+#define SPS30_RESET 0xd304
-+#define SPS30_READ_DATA_READY_FLAG 0x0202
-+#define SPS30_READ_DATA 0x0300
-+#define SPS30_READ_SERIAL 0xd033
-+
-+enum {
-+	PM1,
-+	PM2P5,
-+	PM4,
-+	PM10,
-+};
-+
-+struct sps30_state {
-+	struct i2c_client *client;
-+	/*
-+	 * Guards against concurrent access to sensor registers.
-+	 * Must be held whenever sequence of commands is to be executed.
-+	 */
-+	struct mutex lock;
-+};
-+
-+DECLARE_CRC8_TABLE(sps30_crc8_table);
-+
-+static int sps30_write_then_read(struct sps30_state *state, u8 *txbuf,
-+				 int txsize, u8 *rxbuf, int rxsize)
-+{
-+	int ret;
-+
-+	/*
-+	 * Sensor does not support repeated start so instead of
-+	 * sending two i2c messages in a row we just send one by one.
-+	 */
-+	ret = i2c_master_send(state->client, txbuf, txsize);
-+	if (ret != txsize)
-+		return ret < 0 ? ret : -EIO;
-+
-+	if (!rxbuf)
-+		return 0;
-+
-+	ret = i2c_master_recv(state->client, rxbuf, rxsize);
-+	if (ret != rxsize)
-+		return ret < 0 ? ret : -EIO;
-+
-+	return 0;
-+}
-+
-+static int sps30_do_cmd(struct sps30_state *state, u16 cmd, u8 *data, int size)
-+{
-+	/*
-+	 * Internally sensor stores measurements in a following manner:
-+	 *
-+	 * PM1: upper two bytes, crc8, lower two bytes, crc8
-+	 * PM2P5: upper two bytes, crc8, lower two bytes, crc8
-+	 * PM4: upper two bytes, crc8, lower two bytes, crc8
-+	 * PM10: upper two bytes, crc8, lower two bytes, crc8
-+	 *
-+	 * What follows next are number concentration measurements and
-+	 * typical particle size measurement which we omit.
-+	 */
-+	u8 buf[SPS30_MAX_READ_SIZE] = { cmd >> 8, cmd };
-+	int i, ret = 0;
-+
-+	switch (cmd) {
-+	case SPS30_START_MEAS:
-+		buf[2] = 0x03;
-+		buf[3] = 0x00;
-+		buf[4] = crc8(sps30_crc8_table, &buf[2], 2, CRC8_INIT_VALUE);
-+		ret = sps30_write_then_read(state, buf, 5, NULL, 0);
-+		break;
-+	case SPS30_STOP_MEAS:
-+	case SPS30_RESET:
-+		ret = sps30_write_then_read(state, buf, 2, NULL, 0);
-+		break;
-+	case SPS30_READ_DATA_READY_FLAG:
-+	case SPS30_READ_DATA:
-+	case SPS30_READ_SERIAL:
-+		/* every two data bytes are checksummed */
-+		size += size / 2;
-+		ret = sps30_write_then_read(state, buf, 2, buf, size);
-+		break;
-+	}
-+
-+	if (ret)
-+		return ret;
-+
-+	/* validate received data and strip off crc bytes */
-+	for (i = 0; i < size; i += 3) {
-+		u8 crc = crc8(sps30_crc8_table, &buf[i], 2, CRC8_INIT_VALUE);
-+
-+		if (crc != buf[i + 2]) {
-+			dev_err(&state->client->dev,
-+				"data integrity check failed\n");
-+			return -EIO;
-+		}
-+
-+		*data++ = buf[i];
-+		*data++ = buf[i + 1];
-+	}
-+
-+	return 0;
-+}
-+
-+static s32 sps30_float_to_int_clamped(const u8 *fp)
-+{
-+	int val = get_unaligned_be32(fp);
-+	int mantissa = val & GENMASK(22, 0);
-+	/* this is fine since passed float is always non-negative */
-+	int exp = val >> 23;
-+	int fraction, shift;
-+
-+	/* special case 0 */
-+	if (!exp && !mantissa)
-+		return 0;
-+
-+	exp -= 127;
-+	if (exp < 0) {
-+		/* return values ranging from 1 to 99 */
-+		return ((((1 << 23) + mantissa) * 100) >> 23) >> (-exp);
-+	}
-+
-+	/* return values ranging from 100 to 300000 */
-+	shift = 23 - exp;
-+	val = (1 << exp) + (mantissa >> shift);
-+	if (val >= SPS30_MAX_PM)
-+		return SPS30_MAX_PM * 100;
-+
-+	fraction = mantissa & GENMASK(shift - 1, 0);
-+
-+	return val * 100 + ((fraction * 100) >> shift);
-+}
-+
-+static int sps30_do_meas(struct sps30_state *state, s32 *data, int size)
-+{
-+	int i, ret, tries = 5;
-+	u8 tmp[16];
-+
-+	while (tries--) {
-+		ret = sps30_do_cmd(state, SPS30_READ_DATA_READY_FLAG, tmp, 2);
-+		if (ret)
-+			return -EIO;
-+
-+		/* new measurements ready to be read */
-+		if (tmp[1] == 1)
-+			break;
-+
-+		msleep_interruptible(300);
-+	}
-+
-+	if (!tries)
-+		return -ETIMEDOUT;
-+
-+	ret = sps30_do_cmd(state, SPS30_READ_DATA, tmp, sizeof(int) * size);
-+	if (ret)
-+		return ret;
-+
-+	for (i = 0; i < size; i++)
-+		data[i] = sps30_float_to_int_clamped(&tmp[4 * i]);
-+
-+	return 0;
-+}
-+
-+static irqreturn_t sps30_trigger_handler(int irq, void *p)
-+{
-+	struct iio_poll_func *pf = p;
-+	struct iio_dev *indio_dev = pf->indio_dev;
-+	struct sps30_state *state = iio_priv(indio_dev);
-+	int ret;
-+	s32 data[4 + 2]; /* PM1, PM2P5, PM4, PM10, timestamp */
-+
-+	mutex_lock(&state->lock);
-+	ret = sps30_do_meas(state, data, 4);
-+	mutex_unlock(&state->lock);
-+	if (ret)
-+		goto err;
-+
-+	iio_push_to_buffers_with_timestamp(indio_dev, data,
-+					   iio_get_time_ns(indio_dev));
-+err:
-+	iio_trigger_notify_done(indio_dev->trig);
-+
-+	return IRQ_HANDLED;
-+}
-+
-+static int sps30_read_raw(struct iio_dev *indio_dev,
-+			  struct iio_chan_spec const *chan,
-+			  int *val, int *val2, long mask)
-+{
-+	struct sps30_state *state = iio_priv(indio_dev);
-+	int data[4], ret = -EINVAL;
-+
-+	switch (mask) {
-+	case IIO_CHAN_INFO_PROCESSED:
-+		switch (chan->type) {
-+		case IIO_MASSCONCENTRATION:
-+			mutex_lock(&state->lock);
-+			/* read up to the number of bytes actually needed */
-+			switch (chan->channel2) {
-+			case IIO_MOD_PM1:
-+				ret = sps30_do_meas(state, data, 1);
-+				break;
-+			case IIO_MOD_PM2P5:
-+				ret = sps30_do_meas(state, data, 2);
-+				break;
-+			case IIO_MOD_PM4:
-+				ret = sps30_do_meas(state, data, 3);
-+				break;
-+			case IIO_MOD_PM10:
-+				ret = sps30_do_meas(state, data, 4);
-+				break;
-+			}
-+			mutex_unlock(&state->lock);
-+			if (ret)
-+				return ret;
-+
-+			*val = data[chan->address] / 100;
-+			*val2 = (data[chan->address] % 100) * 10000;
-+
-+			return IIO_VAL_INT_PLUS_MICRO;
-+		default:
-+			return -EINVAL;
-+		}
-+	case IIO_CHAN_INFO_SCALE:
-+		switch (chan->type) {
-+		case IIO_MASSCONCENTRATION:
-+			switch (chan->channel2) {
-+			case IIO_MOD_PM1:
-+			case IIO_MOD_PM2P5:
-+			case IIO_MOD_PM4:
-+			case IIO_MOD_PM10:
-+				*val = 0;
-+				*val2 = 10000;
-+
-+				return IIO_VAL_INT_PLUS_MICRO;
-+			}
-+		default:
-+			return -EINVAL;
-+		}
-+	}
-+
-+	return -EINVAL;
-+}
-+
-+static const struct iio_info sps30_info = {
-+	.read_raw = sps30_read_raw,
-+};
-+
-+#define SPS30_CHAN(_index, _mod) { \
-+	.type = IIO_MASSCONCENTRATION, \
-+	.modified = 1, \
-+	.channel2 = IIO_MOD_ ## _mod, \
-+	.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), \
-+	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
-+	.address = _mod, \
-+	.scan_index = _index, \
-+	.scan_type = { \
-+		.sign = 'u', \
-+		.realbits = 19, \
-+		.storagebits = 32, \
-+		.endianness = IIO_CPU, \
-+	}, \
-+}
-+
-+static const struct iio_chan_spec sps30_channels[] = {
-+	SPS30_CHAN(0, PM1),
-+	SPS30_CHAN(1, PM2P5),
-+	SPS30_CHAN(2, PM4),
-+	SPS30_CHAN(3, PM10),
-+	IIO_CHAN_SOFT_TIMESTAMP(4),
-+};
-+
-+static void sps30_stop_meas(void *data)
-+{
-+	struct sps30_state *state = data;
-+
-+	sps30_do_cmd(state, SPS30_STOP_MEAS, NULL, 0);
-+}
-+
-+static const unsigned long sps30_scan_masks[] = { 0x0f, 0x00 };
-+
-+static int sps30_probe(struct i2c_client *client)
-+{
-+	struct iio_dev *indio_dev;
-+	struct sps30_state *state;
-+	u8 buf[32];
-+	int ret;
-+
-+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
-+		return -EOPNOTSUPP;
-+
-+	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*state));
-+	if (!indio_dev)
-+		return -ENOMEM;
-+
-+	state = iio_priv(indio_dev);
-+	i2c_set_clientdata(client, indio_dev);
-+	state->client = client;
-+	indio_dev->dev.parent = &client->dev;
-+	indio_dev->info = &sps30_info;
-+	indio_dev->name = client->name;
-+	indio_dev->channels = sps30_channels;
-+	indio_dev->num_channels = ARRAY_SIZE(sps30_channels);
-+	indio_dev->modes = INDIO_DIRECT_MODE;
-+	indio_dev->available_scan_masks = sps30_scan_masks;
-+
-+	mutex_init(&state->lock);
-+	crc8_populate_msb(sps30_crc8_table, SPS30_CRC8_POLYNOMIAL);
-+
-+	ret = sps30_do_cmd(state, SPS30_RESET, NULL, 0);
-+	if (ret) {
-+		dev_err(&client->dev, "failed to reset device\n");
-+		return ret;
-+	}
-+	msleep(300);
-+	/*
-+	 * Power-on-reset causes sensor to produce some glitch on i2c bus and
-+	 * some controllers end up in error state. Recover simply by placing
-+	 * some data on the bus, for example STOP_MEAS command, which
-+	 * is NOP in this case.
-+	 */
-+	sps30_do_cmd(state, SPS30_STOP_MEAS, NULL, 0);
-+
-+	ret = sps30_do_cmd(state, SPS30_READ_SERIAL, buf, sizeof(buf));
-+	if (ret) {
-+		dev_err(&client->dev, "failed to read serial number\n");
-+		return ret;
-+	}
-+	/* returned serial number is already NUL terminated */
-+	dev_info(&client->dev, "serial number: %s\n", buf);
-+
-+	ret = sps30_do_cmd(state, SPS30_START_MEAS, NULL, 0);
-+	if (ret) {
-+		dev_err(&client->dev, "failed to start measurement\n");
-+		return ret;
-+	}
-+
-+	ret = devm_add_action_or_reset(&client->dev, sps30_stop_meas, state);
-+	if (ret)
-+		return ret;
-+
-+	ret = devm_iio_triggered_buffer_setup(&client->dev, indio_dev, NULL,
-+					      sps30_trigger_handler, NULL);
-+	if (ret)
-+		return ret;
-+
-+	return devm_iio_device_register(&client->dev, indio_dev);
-+}
-+
-+static const struct i2c_device_id sps30_id[] = {
-+	{ "sps30" },
-+	{ }
-+};
-+MODULE_DEVICE_TABLE(i2c, sps30_id);
-+
-+static const struct of_device_id sps30_of_match[] = {
-+	{ .compatible = "sensirion,sps30" },
-+	{ }
-+};
-+MODULE_DEVICE_TABLE(of, sps30_of_match);
-+
-+static struct i2c_driver sps30_driver = {
-+	.driver = {
-+		.name = "sps30",
-+		.of_match_table = sps30_of_match,
-+	},
-+	.id_table = sps30_id,
-+	.probe_new = sps30_probe,
-+};
-+module_i2c_driver(sps30_driver);
-+
-+MODULE_AUTHOR("Tomasz Duszynski <tduszyns@gmail.com>");
-+MODULE_DESCRIPTION("Sensirion SPS30 particulate matter sensor driver");
-+MODULE_LICENSE("GPL v2");