Update the MAINTAINERS entry and all other references accordingly.
Based on an original patch by Wolfram Sang.
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Acked-by: Peter Korsgaard <peter.korsgaard@barco.com>
[wsa: fixed merge conflict due to rework in i2c_add_mux_adapter()]
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
+++ /dev/null
-Kernel driver gpio-i2cmux
-
-Author: Peter Korsgaard <peter.korsgaard@barco.com>
-
-Description
------------
-
-gpio-i2cmux is an i2c mux driver providing access to I2C bus segments
-from a master I2C bus and a hardware MUX controlled through GPIO pins.
-
-E.G.:
-
- ---------- ---------- Bus segment 1 - - - - -
- | | SCL/SDA | |-------------- | |
- | |------------| |
- | | | | Bus segment 2 | |
- | Linux | GPIO 1..N | MUX |--------------- Devices
- | |------------| | | |
- | | | | Bus segment M
- | | | |---------------| |
- ---------- ---------- - - - - -
-
-SCL/SDA of the master I2C bus is multiplexed to bus segment 1..M
-according to the settings of the GPIO pins 1..N.
-
-Usage
------
-
-gpio-i2cmux uses the platform bus, so you need to provide a struct
-platform_device with the platform_data pointing to a struct
-gpio_i2cmux_platform_data with the I2C adapter number of the master
-bus, the number of bus segments to create and the GPIO pins used
-to control it. See include/linux/gpio-i2cmux.h for details.
-
-E.G. something like this for a MUX providing 4 bus segments
-controlled through 3 GPIO pins:
-
-#include <linux/gpio-i2cmux.h>
-#include <linux/platform_device.h>
-
-static const unsigned myboard_gpiomux_gpios[] = {
- AT91_PIN_PC26, AT91_PIN_PC25, AT91_PIN_PC24
-};
-
-static const unsigned myboard_gpiomux_values[] = {
- 0, 1, 2, 3
-};
-
-static struct gpio_i2cmux_platform_data myboard_i2cmux_data = {
- .parent = 1,
- .base_nr = 2, /* optional */
- .values = myboard_gpiomux_values,
- .n_values = ARRAY_SIZE(myboard_gpiomux_values),
- .gpios = myboard_gpiomux_gpios,
- .n_gpios = ARRAY_SIZE(myboard_gpiomux_gpios),
- .idle = 4, /* optional */
-};
-
-static struct platform_device myboard_i2cmux = {
- .name = "gpio-i2cmux",
- .id = 0,
- .dev = {
- .platform_data = &myboard_i2cmux_data,
- },
-};
--- /dev/null
+Kernel driver i2c-gpio-mux
+
+Author: Peter Korsgaard <peter.korsgaard@barco.com>
+
+Description
+-----------
+
+i2c-gpio-mux is an i2c mux driver providing access to I2C bus segments
+from a master I2C bus and a hardware MUX controlled through GPIO pins.
+
+E.G.:
+
+ ---------- ---------- Bus segment 1 - - - - -
+ | | SCL/SDA | |-------------- | |
+ | |------------| |
+ | | | | Bus segment 2 | |
+ | Linux | GPIO 1..N | MUX |--------------- Devices
+ | |------------| | | |
+ | | | | Bus segment M
+ | | | |---------------| |
+ ---------- ---------- - - - - -
+
+SCL/SDA of the master I2C bus is multiplexed to bus segment 1..M
+according to the settings of the GPIO pins 1..N.
+
+Usage
+-----
+
+i2c-gpio-mux uses the platform bus, so you need to provide a struct
+platform_device with the platform_data pointing to a struct
+gpio_i2cmux_platform_data with the I2C adapter number of the master
+bus, the number of bus segments to create and the GPIO pins used
+to control it. See include/linux/i2c-gpio-mux.h for details.
+
+E.G. something like this for a MUX providing 4 bus segments
+controlled through 3 GPIO pins:
+
+#include <linux/i2c-gpio-mux.h>
+#include <linux/platform_device.h>
+
+static const unsigned myboard_gpiomux_gpios[] = {
+ AT91_PIN_PC26, AT91_PIN_PC25, AT91_PIN_PC24
+};
+
+static const unsigned myboard_gpiomux_values[] = {
+ 0, 1, 2, 3
+};
+
+static struct gpio_i2cmux_platform_data myboard_i2cmux_data = {
+ .parent = 1,
+ .base_nr = 2, /* optional */
+ .values = myboard_gpiomux_values,
+ .n_values = ARRAY_SIZE(myboard_gpiomux_values),
+ .gpios = myboard_gpiomux_gpios,
+ .n_gpios = ARRAY_SIZE(myboard_gpiomux_gpios),
+ .idle = 4, /* optional */
+};
+
+static struct platform_device myboard_i2cmux = {
+ .name = "i2c-gpio-mux",
+ .id = 0,
+ .dev = {
+ .platform_data = &myboard_i2cmux_data,
+ },
+};
M: Peter Korsgaard <peter.korsgaard@barco.com>
L: linux-i2c@vger.kernel.org
S: Supported
-F: drivers/i2c/muxes/gpio-i2cmux.c
-F: include/linux/gpio-i2cmux.h
-F: Documentation/i2c/muxes/gpio-i2cmux
+F: drivers/i2c/muxes/i2c-mux-gpio.c
+F: include/linux/i2c-mux-gpio.h
+F: Documentation/i2c/muxes/i2c-mux-gpio
GENERIC HDLC (WAN) DRIVERS
M: Krzysztof Halasa <khc@pm.waw.pl>
through GPIO pins.
This driver can also be built as a module. If so, the module
- will be called gpio-i2cmux.
+ will be called i2c-mux-gpio.
config I2C_MUX_PCA9541
tristate "NXP PCA9541 I2C Master Selector"
#
# Makefile for multiplexer I2C chip drivers.
-obj-$(CONFIG_I2C_MUX_GPIO) += gpio-i2cmux.o
+obj-$(CONFIG_I2C_MUX_GPIO) += i2c-mux-gpio.o
obj-$(CONFIG_I2C_MUX_PCA9541) += i2c-mux-pca9541.o
obj-$(CONFIG_I2C_MUX_PCA954x) += i2c-mux-pca954x.o
+++ /dev/null
-/*
- * I2C multiplexer using GPIO API
- *
- * Peter Korsgaard <peter.korsgaard@barco.com>
- *
- * 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/i2c.h>
-#include <linux/i2c-mux.h>
-#include <linux/gpio-i2cmux.h>
-#include <linux/platform_device.h>
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/slab.h>
-#include <linux/gpio.h>
-
-struct gpiomux {
- struct i2c_adapter *parent;
- struct i2c_adapter **adap; /* child busses */
- struct gpio_i2cmux_platform_data data;
-};
-
-static void gpiomux_set(const struct gpiomux *mux, unsigned val)
-{
- int i;
-
- for (i = 0; i < mux->data.n_gpios; i++)
- gpio_set_value(mux->data.gpios[i], val & (1 << i));
-}
-
-static int gpiomux_select(struct i2c_adapter *adap, void *data, u32 chan)
-{
- struct gpiomux *mux = data;
-
- gpiomux_set(mux, mux->data.values[chan]);
-
- return 0;
-}
-
-static int gpiomux_deselect(struct i2c_adapter *adap, void *data, u32 chan)
-{
- struct gpiomux *mux = data;
-
- gpiomux_set(mux, mux->data.idle);
-
- return 0;
-}
-
-static int __devinit gpiomux_probe(struct platform_device *pdev)
-{
- struct gpiomux *mux;
- struct gpio_i2cmux_platform_data *pdata;
- struct i2c_adapter *parent;
- int (*deselect) (struct i2c_adapter *, void *, u32);
- unsigned initial_state;
- int i, ret;
-
- pdata = pdev->dev.platform_data;
- if (!pdata) {
- dev_err(&pdev->dev, "Missing platform data\n");
- return -ENODEV;
- }
-
- parent = i2c_get_adapter(pdata->parent);
- if (!parent) {
- dev_err(&pdev->dev, "Parent adapter (%d) not found\n",
- pdata->parent);
- return -ENODEV;
- }
-
- mux = kzalloc(sizeof(*mux), GFP_KERNEL);
- if (!mux) {
- ret = -ENOMEM;
- goto alloc_failed;
- }
-
- mux->parent = parent;
- mux->data = *pdata;
- mux->adap = kzalloc(sizeof(struct i2c_adapter *) * pdata->n_values,
- GFP_KERNEL);
- if (!mux->adap) {
- ret = -ENOMEM;
- goto alloc_failed2;
- }
-
- if (pdata->idle != GPIO_I2CMUX_NO_IDLE) {
- initial_state = pdata->idle;
- deselect = gpiomux_deselect;
- } else {
- initial_state = pdata->values[0];
- deselect = NULL;
- }
-
- for (i = 0; i < pdata->n_gpios; i++) {
- ret = gpio_request(pdata->gpios[i], "gpio-i2cmux");
- if (ret)
- goto err_request_gpio;
- gpio_direction_output(pdata->gpios[i],
- initial_state & (1 << i));
- }
-
- for (i = 0; i < pdata->n_values; i++) {
- u32 nr = pdata->base_nr ? (pdata->base_nr + i) : 0;
-
- mux->adap[i] = i2c_add_mux_adapter(parent, &pdev->dev, mux,
- nr, i,
- gpiomux_select, deselect);
- if (!mux->adap[i]) {
- ret = -ENODEV;
- dev_err(&pdev->dev, "Failed to add adapter %d\n", i);
- goto add_adapter_failed;
- }
- }
-
- dev_info(&pdev->dev, "%d port mux on %s adapter\n",
- pdata->n_values, parent->name);
-
- platform_set_drvdata(pdev, mux);
-
- return 0;
-
-add_adapter_failed:
- for (; i > 0; i--)
- i2c_del_mux_adapter(mux->adap[i - 1]);
- i = pdata->n_gpios;
-err_request_gpio:
- for (; i > 0; i--)
- gpio_free(pdata->gpios[i - 1]);
- kfree(mux->adap);
-alloc_failed2:
- kfree(mux);
-alloc_failed:
- i2c_put_adapter(parent);
-
- return ret;
-}
-
-static int __devexit gpiomux_remove(struct platform_device *pdev)
-{
- struct gpiomux *mux = platform_get_drvdata(pdev);
- int i;
-
- for (i = 0; i < mux->data.n_values; i++)
- i2c_del_mux_adapter(mux->adap[i]);
-
- for (i = 0; i < mux->data.n_gpios; i++)
- gpio_free(mux->data.gpios[i]);
-
- platform_set_drvdata(pdev, NULL);
- i2c_put_adapter(mux->parent);
- kfree(mux->adap);
- kfree(mux);
-
- return 0;
-}
-
-static struct platform_driver gpiomux_driver = {
- .probe = gpiomux_probe,
- .remove = __devexit_p(gpiomux_remove),
- .driver = {
- .owner = THIS_MODULE,
- .name = "gpio-i2cmux",
- },
-};
-
-module_platform_driver(gpiomux_driver);
-
-MODULE_DESCRIPTION("GPIO-based I2C multiplexer driver");
-MODULE_AUTHOR("Peter Korsgaard <peter.korsgaard@barco.com>");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS("platform:gpio-i2cmux");
--- /dev/null
+/*
+ * I2C multiplexer using GPIO API
+ *
+ * Peter Korsgaard <peter.korsgaard@barco.com>
+ *
+ * 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/i2c.h>
+#include <linux/i2c-mux.h>
+#include <linux/i2c-mux-gpio.h>
+#include <linux/platform_device.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/gpio.h>
+
+struct gpiomux {
+ struct i2c_adapter *parent;
+ struct i2c_adapter **adap; /* child busses */
+ struct i2c_mux_gpio_platform_data data;
+};
+
+static void i2c_mux_gpio_set(const struct gpiomux *mux, unsigned val)
+{
+ int i;
+
+ for (i = 0; i < mux->data.n_gpios; i++)
+ gpio_set_value(mux->data.gpios[i], val & (1 << i));
+}
+
+static int i2c_mux_gpio_select(struct i2c_adapter *adap, void *data, u32 chan)
+{
+ struct gpiomux *mux = data;
+
+ i2c_mux_gpio_set(mux, mux->data.values[chan]);
+
+ return 0;
+}
+
+static int i2c_mux_gpio_deselect(struct i2c_adapter *adap, void *data, u32 chan)
+{
+ struct gpiomux *mux = data;
+
+ i2c_mux_gpio_set(mux, mux->data.idle);
+
+ return 0;
+}
+
+static int __devinit i2c_mux_gpio_probe(struct platform_device *pdev)
+{
+ struct gpiomux *mux;
+ struct i2c_mux_gpio_platform_data *pdata;
+ struct i2c_adapter *parent;
+ int (*deselect) (struct i2c_adapter *, void *, u32);
+ unsigned initial_state;
+ int i, ret;
+
+ pdata = pdev->dev.platform_data;
+ if (!pdata) {
+ dev_err(&pdev->dev, "Missing platform data\n");
+ return -ENODEV;
+ }
+
+ parent = i2c_get_adapter(pdata->parent);
+ if (!parent) {
+ dev_err(&pdev->dev, "Parent adapter (%d) not found\n",
+ pdata->parent);
+ return -ENODEV;
+ }
+
+ mux = kzalloc(sizeof(*mux), GFP_KERNEL);
+ if (!mux) {
+ ret = -ENOMEM;
+ goto alloc_failed;
+ }
+
+ mux->parent = parent;
+ mux->data = *pdata;
+ mux->adap = kzalloc(sizeof(struct i2c_adapter *) * pdata->n_values,
+ GFP_KERNEL);
+ if (!mux->adap) {
+ ret = -ENOMEM;
+ goto alloc_failed2;
+ }
+
+ if (pdata->idle != I2C_MUX_GPIO_NO_IDLE) {
+ initial_state = pdata->idle;
+ deselect = i2c_mux_gpio_deselect;
+ } else {
+ initial_state = pdata->values[0];
+ deselect = NULL;
+ }
+
+ for (i = 0; i < pdata->n_gpios; i++) {
+ ret = gpio_request(pdata->gpios[i], "i2c-mux-gpio");
+ if (ret)
+ goto err_request_gpio;
+ gpio_direction_output(pdata->gpios[i],
+ initial_state & (1 << i));
+ }
+
+ for (i = 0; i < pdata->n_values; i++) {
+ u32 nr = pdata->base_nr ? (pdata->base_nr + i) : 0;
+
+ mux->adap[i] = i2c_add_mux_adapter(parent, &pdev->dev, mux, nr, i,
+ i2c_mux_gpio_select, deselect);
+ if (!mux->adap[i]) {
+ ret = -ENODEV;
+ dev_err(&pdev->dev, "Failed to add adapter %d\n", i);
+ goto add_adapter_failed;
+ }
+ }
+
+ dev_info(&pdev->dev, "%d port mux on %s adapter\n",
+ pdata->n_values, parent->name);
+
+ platform_set_drvdata(pdev, mux);
+
+ return 0;
+
+add_adapter_failed:
+ for (; i > 0; i--)
+ i2c_del_mux_adapter(mux->adap[i - 1]);
+ i = pdata->n_gpios;
+err_request_gpio:
+ for (; i > 0; i--)
+ gpio_free(pdata->gpios[i - 1]);
+ kfree(mux->adap);
+alloc_failed2:
+ kfree(mux);
+alloc_failed:
+ i2c_put_adapter(parent);
+
+ return ret;
+}
+
+static int __devexit i2c_mux_gpio_remove(struct platform_device *pdev)
+{
+ struct gpiomux *mux = platform_get_drvdata(pdev);
+ int i;
+
+ for (i = 0; i < mux->data.n_values; i++)
+ i2c_del_mux_adapter(mux->adap[i]);
+
+ for (i = 0; i < mux->data.n_gpios; i++)
+ gpio_free(mux->data.gpios[i]);
+
+ platform_set_drvdata(pdev, NULL);
+ i2c_put_adapter(mux->parent);
+ kfree(mux->adap);
+ kfree(mux);
+
+ return 0;
+}
+
+static struct platform_driver i2c_mux_gpio_driver = {
+ .probe = i2c_mux_gpio_probe,
+ .remove = __devexit_p(i2c_mux_gpio_remove),
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "i2c-mux-gpio",
+ },
+};
+
+module_platform_driver(i2c_mux_gpio_driver);
+
+MODULE_DESCRIPTION("GPIO-based I2C multiplexer driver");
+MODULE_AUTHOR("Peter Korsgaard <peter.korsgaard@barco.com>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:i2c-mux-gpio");
+++ /dev/null
-/*
- * gpio-i2cmux interface to platform code
- *
- * Peter Korsgaard <peter.korsgaard@barco.com>
- *
- * 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.
- */
-
-#ifndef _LINUX_GPIO_I2CMUX_H
-#define _LINUX_GPIO_I2CMUX_H
-
-/* MUX has no specific idle mode */
-#define GPIO_I2CMUX_NO_IDLE ((unsigned)-1)
-
-/**
- * struct gpio_i2cmux_platform_data - Platform-dependent data for gpio-i2cmux
- * @parent: Parent I2C bus adapter number
- * @base_nr: Base I2C bus number to number adapters from or zero for dynamic
- * @values: Array of bitmasks of GPIO settings (low/high) for each
- * position
- * @n_values: Number of multiplexer positions (busses to instantiate)
- * @gpios: Array of GPIO numbers used to control MUX
- * @n_gpios: Number of GPIOs used to control MUX
- * @idle: Bitmask to write to MUX when idle or GPIO_I2CMUX_NO_IDLE if not used
- */
-struct gpio_i2cmux_platform_data {
- int parent;
- int base_nr;
- const unsigned *values;
- int n_values;
- const unsigned *gpios;
- int n_gpios;
- unsigned idle;
-};
-
-#endif /* _LINUX_GPIO_I2CMUX_H */
--- /dev/null
+/*
+ * i2c-mux-gpio interface to platform code
+ *
+ * Peter Korsgaard <peter.korsgaard@barco.com>
+ *
+ * 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.
+ */
+
+#ifndef _LINUX_I2C_MUX_GPIO_H
+#define _LINUX_I2C_MUX_GPIO_H
+
+/* MUX has no specific idle mode */
+#define I2C_MUX_GPIO_NO_IDLE ((unsigned)-1)
+
+/**
+ * struct i2c_mux_gpio_platform_data - Platform-dependent data for i2c-mux-gpio
+ * @parent: Parent I2C bus adapter number
+ * @base_nr: Base I2C bus number to number adapters from or zero for dynamic
+ * @values: Array of bitmasks of GPIO settings (low/high) for each
+ * position
+ * @n_values: Number of multiplexer positions (busses to instantiate)
+ * @gpios: Array of GPIO numbers used to control MUX
+ * @n_gpios: Number of GPIOs used to control MUX
+ * @idle: Bitmask to write to MUX when idle or GPIO_I2CMUX_NO_IDLE if not used
+ */
+struct i2c_mux_gpio_platform_data {
+ int parent;
+ int base_nr;
+ const unsigned *values;
+ int n_values;
+ const unsigned *gpios;
+ int n_gpios;
+ unsigned idle;
+};
+
+#endif /* _LINUX_I2C_MUX_GPIO_H */
projects / GitHub / exynos8895 / android_kernel_samsung_universal8895.git / commitdiff