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Message-ID: <20180713122738.5888-1-mircea.caprioru@analog.com>
Date: Fri, 13 Jul 2018 15:27:38 +0300
From: Mircea Caprioru <mircea.caprioru@...log.com>
To: <peda@...ntia.se>
CC: <davem@...emloft.net>, <mchehab+samsung@...nel.org>,
<akpm@...ux-foundation.org>, <rdunlap@...radead.org>,
<linux-kernel@...r.kernel.org>,
Mircea Caprioru <mircea.caprioru@...log.com>
Subject: [PATCH 1/2] mux:adgs1408/1409: New driver for Analog Devices ADGS1408/1409 mux …
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@...log.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@...r.kernel.org
S: Maintained
F: drivers/media/i2c/ad9389b*
+ANALOG DEVICES INC ADGS1408 DRIVER
+M: Mircea Caprioru <mircea.caprioru@...log.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@...afoo.de>
L: linux-media@...r.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@...log.com>");
+MODULE_DESCRIPTION("Analog Devices ADGS140x MUX driver");
+MODULE_LICENSE("GPL v2");
--
2.17.1
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