net: fsk: Prepare SiLabs Si4432 driverlora-next

Tested with HopeRF RFM22B module on Chistera Pi HAT.

Signed-off-by: Andreas Färber <afaerber@suse.de>

2 files changed, 90 insertions, 0 deletions

diff --git a/drivers/net/fsk/Makefile b/drivers/net/fsk/Makefile
index 0be2ecc561dcef..f2b53696e7a172 100644
--- a/drivers/net/fsk/Makefile
+++ b/drivers/net/fsk/Makefile
@@ -1,2 +1,5 @@
 obj-m += fsk-nrf24l01p.o
 fsk-nrf24l01p-y := nrf24l01p.o
+
+obj-m += fsk-si443x.o
+fsk-si443x-y := si443x.o
diff --git a/drivers/net/fsk/si443x.c b/drivers/net/fsk/si443x.c
new file mode 100644
index 00000000000000..ee2873665470ad
--- /dev/null
+++ b/drivers/net/fsk/si443x.c
@@ -0,0 +1,87 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * SiLabs Si4432 transceiver
+ *
+ * Copyright (c) 2019 Andreas Färber
+ */
+
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/regmap.h>
+#include <linux/spi/spi.h>
+
+static struct regmap_config si443x_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+
+	.cache_type = REGCACHE_NONE,
+
+	.read_flag_mask = 0,
+	.write_flag_mask = BIT(7),
+
+	.max_register = 0x7f,
+};
+
+#ifdef CONFIG_OF
+static const struct of_device_id si443x_dt_ids[] = {
+	{ .compatible = "silabs,si4432" },
+	{}
+};
+MODULE_DEVICE_TABLE(of, si443x_dt_ids);
+#endif
+
+static int si443x_probe(struct spi_device *spi)
+{
+	struct regmap *regmap;
+	unsigned int val;
+	int ret;
+
+	spi->bits_per_word = 8;
+	spi_setup(spi);
+
+	regmap = devm_regmap_init_spi(spi, &si443x_regmap_config);
+	if (IS_ERR(regmap)) {
+		ret = PTR_ERR(regmap);
+		return ret;
+	}
+
+	ret = regmap_read(regmap, 0, &val);
+	if (ret)
+		return ret;
+
+	dev_info(&spi->dev, "device type: 0x%02x\n", val);
+
+	ret = regmap_read(regmap, 1, &val);
+	if (ret)
+		return ret;
+
+	dev_info(&spi->dev, "device version: 0x%02x\n", val);
+
+	dev_info(&spi->dev, "probed\n");
+
+	return 0;
+}
+
+static int si443x_remove(struct spi_device *spi)
+{
+	dev_info(&spi->dev, "removed\n");
+
+	return 0;
+}
+
+static struct spi_driver si443x_spi_driver = {
+	.driver = {
+		.name = "si443x",
+		.of_match_table = of_match_ptr(si443x_dt_ids),
+	},
+	.probe = si443x_probe,
+	.remove = si443x_remove,
+};
+
+module_spi_driver(si443x_spi_driver);
+
+MODULE_DESCRIPTION("Si443x SPI driver");
+MODULE_AUTHOR("Andreas Färber <afaerber@suse.de>");
+MODULE_LICENSE("GPL");