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Message-ID: <1484755035-25927-11-git-send-email-peda@axentia.se>
Date: Wed, 18 Jan 2017 16:57:13 +0100
From: Peter Rosin <peda@...ntia.se>
To: <linux-kernel@...r.kernel.org>
CC: Peter Rosin <peda@...ntia.se>, Wolfram Sang <wsa@...-dreams.de>,
Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Jonathan Cameron <jic23@...nel.org>,
Hartmut Knaack <knaack.h@....de>,
Lars-Peter Clausen <lars@...afoo.de>,
Peter Meerwald-Stadler <pmeerw@...erw.net>,
Jonathan Corbet <corbet@....net>,
Andrew Morton <akpm@...ux-foundation.org>,
<linux-i2c@...r.kernel.org>, <devicetree@...r.kernel.org>,
<linux-iio@...r.kernel.org>, <linux-doc@...r.kernel.org>
Subject: [PATCH v8 10/12] mux: adg792a: add mux controller driver for ADG792A/G
Analog Devices ADG792A/G is a triple 4:1 mux.
Reviewed-by: Jonathan Cameron <jic23@...nel.org>
Signed-off-by: Peter Rosin <peda@...ntia.se>
---
drivers/mux/Kconfig | 12 ++++
drivers/mux/Makefile | 1 +
drivers/mux/mux-adg792a.c | 167 ++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 180 insertions(+)
create mode 100644 drivers/mux/mux-adg792a.c
diff --git a/drivers/mux/Kconfig b/drivers/mux/Kconfig
index 57e6f4e5fda9..d13fcf98958e 100644
--- a/drivers/mux/Kconfig
+++ b/drivers/mux/Kconfig
@@ -16,6 +16,18 @@ menuconfig MULTIPLEXER
if MULTIPLEXER
+config MUX_ADG792A
+ tristate "Analog Devices ADG792A/ADG792G Multiplexers"
+ depends on I2C
+ help
+ ADG792A and ADG792G Wide Bandwidth Triple 4:1 Multiplexers
+
+ The driver supports both operating the three multiplexers in
+ parallel and operating them independently.
+
+ To compile the driver as a module, choose M here: the module will
+ be called mux-adg792a.
+
config MUX_GPIO
tristate "GPIO-controlled Multiplexer"
depends on OF && GPIOLIB
diff --git a/drivers/mux/Makefile b/drivers/mux/Makefile
index facc43da3648..fddbb073fc77 100644
--- a/drivers/mux/Makefile
+++ b/drivers/mux/Makefile
@@ -3,4 +3,5 @@
#
obj-$(CONFIG_MULTIPLEXER) += mux-core.o
+obj-$(CONFIG_MUX_ADG792A) += mux-adg792a.o
obj-$(CONFIG_MUX_GPIO) += mux-gpio.o
diff --git a/drivers/mux/mux-adg792a.c b/drivers/mux/mux-adg792a.c
new file mode 100644
index 000000000000..6a4c4c9f585b
--- /dev/null
+++ b/drivers/mux/mux-adg792a.c
@@ -0,0 +1,167 @@
+/*
+ * Multiplexer driver for Analog Devices ADG792A/G Triple 4:1 mux
+ *
+ * Copyright (C) 2017 Axentia Technologies AB
+ *
+ * Author: Peter Rosin <peda@...ntia.se>
+ *
+ * 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.
+ */
+
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/mux.h>
+
+#define ADG792A_LDSW BIT(0)
+#define ADG792A_RESET BIT(1)
+#define ADG792A_DISABLE(mux) (0x50 | (mux))
+#define ADG792A_DISABLE_ALL (0x5f)
+#define ADG792A_MUX(mux, state) (0xc0 | (((mux) + 1) << 2) | (state))
+#define ADG792A_MUX_ALL(state) (0xc0 | (state))
+
+#define ADG792A_DISABLE_STATE (4)
+
+static int adg792a_set(struct mux_control *mux, int state)
+{
+ struct i2c_client *i2c = to_i2c_client(mux->chip->dev.parent);
+ u8 cmd;
+
+ if (mux->chip->controllers == 1) {
+ /* parallel mux controller operation */
+ if (state == ADG792A_DISABLE_STATE)
+ cmd = ADG792A_DISABLE_ALL;
+ else
+ cmd = ADG792A_MUX_ALL(state);
+ } else {
+ unsigned int controller = mux_control_get_index(mux);
+
+ if (state == ADG792A_DISABLE_STATE)
+ cmd = ADG792A_DISABLE(controller);
+ else
+ cmd = ADG792A_MUX(controller, state);
+ }
+
+ return i2c_smbus_write_byte_data(i2c, cmd, ADG792A_LDSW);
+}
+
+static const struct mux_control_ops adg792a_ops = {
+ .set = adg792a_set,
+};
+
+static int adg792a_probe(struct i2c_client *i2c,
+ const struct i2c_device_id *id)
+{
+ struct device *dev = &i2c->dev;
+ struct mux_chip *mux_chip;
+ bool parallel;
+ int count;
+ int ret;
+ int i;
+
+ parallel = of_property_read_bool(i2c->dev.of_node, "adi,parallel");
+
+ mux_chip = devm_mux_chip_alloc(dev, parallel ? 1 : 3, 0);
+ if (!mux_chip)
+ return -ENOMEM;
+
+ mux_chip->ops = &adg792a_ops;
+
+ ret = i2c_smbus_write_byte_data(i2c, ADG792A_DISABLE_ALL,
+ ADG792A_RESET | ADG792A_LDSW);
+ if (ret < 0)
+ return ret;
+
+ for (i = 0; i < mux_chip->controllers; ++i) {
+ struct mux_control *mux = &mux_chip->mux[i];
+
+ mux->states = 4;
+ }
+
+ count = of_property_count_u32_elems(dev->of_node, "adi,idle-state");
+ for (i = 0; i < count; i += 2) {
+ u32 index;
+ u32 idle_state;
+
+ ret = of_property_read_u32_index(dev->of_node,
+ "adi,idle-state", i,
+ &index);
+ if (ret < 0)
+ return ret;
+ if (index >= mux_chip->controllers) {
+ dev_err(dev, "invalid mux %u\n", index);
+ return -EINVAL;
+ }
+
+ ret = of_property_read_u32_index(dev->of_node,
+ "adi,idle-state", i + 1,
+ &idle_state);
+ if (ret < 0)
+ return ret;
+ if (idle_state >= ADG792A_DISABLE_STATE) {
+ dev_err(dev, "invalid idle-state %u for mux %u\n",
+ idle_state, index);
+ return -EINVAL;
+ }
+ mux_chip->mux[index].idle_state = idle_state;
+ }
+
+ count = of_property_count_u32_elems(dev->of_node,
+ "adi,idle-high-impedance");
+ for (i = 0; i < count; ++i) {
+ u32 index;
+
+ ret = of_property_read_u32_index(dev->of_node,
+ "adi,idle-high-impedance", i,
+ &index);
+ if (ret < 0)
+ return ret;
+ if (index >= mux_chip->controllers) {
+ dev_err(dev, "invalid mux %u\n", index);
+ return -EINVAL;
+ }
+
+ mux_chip->mux[index].idle_state = ADG792A_DISABLE_STATE;
+ }
+
+ ret = devm_mux_chip_register(dev, mux_chip);
+ if (ret < 0)
+ return ret;
+
+ if (parallel)
+ dev_info(dev, "triple pole quadruple throw mux registered\n");
+ else
+ dev_info(dev, "3x single pole quadruple throw muxes registered\n");
+
+ return 0;
+}
+
+static const struct i2c_device_id adg792a_id[] = {
+ { .name = "adg792a", },
+ { .name = "adg792g", },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, adg792a_id);
+
+static const struct of_device_id adg792a_of_match[] = {
+ { .compatible = "adi,adg792a", },
+ { .compatible = "adi,adg792g", },
+ { }
+};
+MODULE_DEVICE_TABLE(of, adg792a_of_match);
+
+static struct i2c_driver adg792a_driver = {
+ .driver = {
+ .name = "adg792a",
+ .of_match_table = of_match_ptr(adg792a_of_match),
+ },
+ .probe = adg792a_probe,
+ .id_table = adg792a_id,
+};
+module_i2c_driver(adg792a_driver);
+
+MODULE_DESCRIPTION("Analog Devices ADG792A/G Triple 4:1 mux driver");
+MODULE_AUTHOR("Peter Rosin <peda@...ntia.se");
+MODULE_LICENSE("GPL v2");
--
2.1.4
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