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From:   Mircea Caprioru <mircea.caprioru@analog.com>
To:     <peda@axentia.se>
CC:     <davem@davemloft.net>, <mchehab+samsung@kernel.org>,
        <akpm@linux-foundation.org>, <rdunlap@infradead.org>,
        <linux-kernel@vger.kernel.org>,
        Mircea Caprioru <mircea.caprioru@analog.com>
Subject: [PATCH 1/2] =?UTF-8?q?mux:adgs1408/1409:=20New=20driver=20for=20A?= =?UTF-8?q?nalog=20Devices=20ADGS1408/1409=20mux=20=E2=80=A6?=
Date:   Fri, 13 Jul 2018 15:27:38 +0300
Message-ID: <20180713122738.5888-1-mircea.caprioru@analog.com>
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This patch adds basic support for Analog Device ADGS1408/09 SPI mux
controller.

The device is probed and set to a disabled state. It uses the new mux
controller framework.

Signed-off-by: Mircea Caprioru <mircea.caprioru@analog.com>
---
 MAINTAINERS            |   7 +++
 drivers/mux/Kconfig    |  12 ++++
 drivers/mux/Makefile   |   2 +
 drivers/mux/adgs140x.c | 132 +++++++++++++++++++++++++++++++++++++++++
 4 files changed, 153 insertions(+)
 create mode 100644 drivers/mux/adgs140x.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 192d7f73fd01..7aa68f38ea4b 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -810,6 +810,13 @@ L:	linux-media@vger.kernel.org
 S:	Maintained
 F:	drivers/media/i2c/ad9389b*
 
+ANALOG DEVICES INC ADGS1408 DRIVER
+M:	Mircea Caprioru <mircea.caprioru@analog.com>
+W:	http://wiki.analog.com/
+W:	http://ez.analog.com/community/linux-device-drivers
+S:	Supported
+F:	drivers/mux/adgs140x.c
+
 ANALOG DEVICES INC ADV7180 DRIVER
 M:	Lars-Peter Clausen <lars@metafoo.de>
 L:	linux-media@vger.kernel.org
diff --git a/drivers/mux/Kconfig b/drivers/mux/Kconfig
index 6241678e99af..87b3fda56d8f 100644
--- a/drivers/mux/Kconfig
+++ b/drivers/mux/Kconfig
@@ -48,4 +48,16 @@ config MUX_MMIO
 	  To compile the driver as a module, choose M here: the module will
 	  be called mux-mmio.
 
+config MUX_ADGS140X
+	tristate "Analog Devices ADGS1408/ADGS1409 Multiplexers"
+	depends on SPI
+	help
+	  ADGS1408 and ADGS1409 4 independent single-pole/single-throw
+	  switches.
+
+	  The driver suports driving each switch independently.
+
+	  To compile the driver as a module, choose M here: the module will
+	  be called mux-ads140x.
+
 endmenu
diff --git a/drivers/mux/Makefile b/drivers/mux/Makefile
index c3d883955fd5..236e7738462a 100644
--- a/drivers/mux/Makefile
+++ b/drivers/mux/Makefile
@@ -5,10 +5,12 @@
 
 mux-core-objs			:= core.o
 mux-adg792a-objs		:= adg792a.o
+mux-adgs140x-objs		:= adgs140x.o
 mux-gpio-objs			:= gpio.o
 mux-mmio-objs			:= mmio.o
 
 obj-$(CONFIG_MULTIPLEXER)	+= mux-core.o
 obj-$(CONFIG_MUX_ADG792A)	+= mux-adg792a.o
+obj-$(CONFIG_MUX_ADGS140X)	+= mux-adgs140x.o
 obj-$(CONFIG_MUX_GPIO)		+= mux-gpio.o
 obj-$(CONFIG_MUX_MMIO)		+= mux-mmio.o
diff --git a/drivers/mux/adgs140x.c b/drivers/mux/adgs140x.c
new file mode 100644
index 000000000000..13dd95acca20
--- /dev/null
+++ b/drivers/mux/adgs140x.c
@@ -0,0 +1,132 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * ADG1408 SPI MUX driver
+ *
+ * Copyright 2018 Analog Devices Inc.
+ *
+ */
+
+#include <linux/err.h>
+#include <linux/of.h>
+#include <linux/module.h>
+#include <linux/mux/driver.h>
+#include <linux/spi/spi.h>
+#include <linux/property.h>
+
+#define ADGS1408_SW_DATA       (0x01)
+#define ADGS1408_REG_READ(reg) ((reg) | 0x80)
+#define ADGS1408_DISABLE       (0x00)
+#define ADGS1408_MUX(state)    (((state) << 1) | 1)
+
+static int adgs140x_spi_reg_write(struct spi_device *spi,
+				u8 reg_addr, u8 reg_data)
+{
+	u8 tx_buf[2];
+
+	tx_buf[0] = reg_addr;
+	tx_buf[1] = reg_data;
+
+	return spi_write_then_read(spi, tx_buf, sizeof(tx_buf), NULL, 0);
+}
+
+static int adgs140x_set(struct mux_control *mux, int state)
+{
+	struct spi_device *spi = to_spi_device(mux->chip->dev.parent);
+	u8 reg;
+
+	if (state == MUX_IDLE_DISCONNECT)
+		reg = ADGS1408_DISABLE;
+	else
+		reg = ADGS1408_MUX(state);
+
+	return adgs140x_spi_reg_write(spi, ADGS1408_SW_DATA, reg);
+}
+
+static const struct mux_control_ops adgs140x_ops = {
+	.set = adgs140x_set,
+};
+
+static int adgs140x_probe(struct spi_device *spi)
+{
+	struct device *dev = &spi->dev;
+	struct mux_chip *mux_chip;
+	u32 idle_state[2];
+	u32 cells;
+	int ret;
+	int i;
+
+	ret = device_property_read_u32(dev, "#mux-control-cells", &cells);
+	if (ret < 0)
+		return ret;
+
+	if (cells >= 2)
+		return -EINVAL;
+
+	mux_chip = devm_mux_chip_alloc(dev, cells ? 2 : 1, 0);
+	if (IS_ERR(mux_chip))
+		return PTR_ERR(mux_chip);
+
+	mux_chip->ops = &adgs140x_ops;
+
+	ret = adgs140x_spi_reg_write(spi, ADGS1408_SW_DATA, ADGS1408_DISABLE);
+	if (ret < 0)
+		return ret;
+
+	ret = device_property_read_u32_array(dev, "idle-state",
+					     idle_state,
+					     mux_chip->controllers);
+	if (ret < 0) {
+		idle_state[0] = MUX_IDLE_AS_IS;
+		idle_state[1] = MUX_IDLE_AS_IS;
+	}
+
+	for (i = 0; i < mux_chip->controllers; ++i) {
+		struct mux_control *mux = &mux_chip->mux[i];
+
+		if (mux_chip->controllers == 1)
+			mux->states = 8;
+		else
+			mux->states = 4;
+
+		switch (idle_state[i]) {
+		case MUX_IDLE_DISCONNECT:
+		case MUX_IDLE_AS_IS:
+		case 0 ... 8:
+			mux->idle_state = idle_state[i];
+			break;
+		default:
+			dev_err(dev, "invalid idle-state %d\n", idle_state[i]);
+			return -EINVAL;
+		}
+	}
+
+	return devm_mux_chip_register(dev, mux_chip);
+}
+
+static const struct spi_device_id adgs140x_id[] = {
+	{ .name = "adgs1408", },
+	{ .name = "adgs1409", },
+	{ }
+};
+MODULE_DEVICE_TABLE(spi, adgs140x_id);
+
+static const struct of_device_id adgs140x_of_match[] = {
+	{ .compatible = "adi,adgs1408", },
+	{ .compatible = "adi,adgs1409", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, adgs140x_of_match);
+
+static struct spi_driver adgs140x_driver = {
+	.driver = {
+		.name = "adgs1408",
+		.of_match_table = of_match_ptr(adgs140x_of_match),
+	},
+	.probe = adgs140x_probe,
+	.id_table = adgs140x_id,
+};
+module_spi_driver(adgs140x_driver);
+
+MODULE_AUTHOR("Mircea Caprioru <mircea.caprioru@analog.com>");
+MODULE_DESCRIPTION("Analog Devices ADGS140x MUX driver");
+MODULE_LICENSE("GPL v2");
-- 
2.17.1