Merge branch 'i2c-mux/for-next' of https://github.com/peda-r/i2c-mux into i2c/for-4.12
Pull in changes from the i2c-mux subsubsystem: "Here are a new LTC4306/5 driver, a fix needed by the RT kernel and some error message cleanup."
This commit is contained in:
Wolfram Sang
commit
69e620f866
61
Documentation/devicetree/bindings/i2c/i2c-mux-ltc4306.txt
Normal file
61
Documentation/devicetree/bindings/i2c/i2c-mux-ltc4306.txt
Normal file
@ -0,0 +1,61 @@
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* Linear Technology / Analog Devices I2C bus switch
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Required Properties:
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- compatible: Must contain one of the following.
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"lltc,ltc4305", "lltc,ltc4306"
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- reg: The I2C address of the device.
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The following required properties are defined externally:
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- Standard I2C mux properties. See i2c-mux.txt in this directory.
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- I2C child bus nodes. See i2c-mux.txt in this directory.
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Optional Properties:
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- enable-gpios: Reference to the GPIO connected to the enable input.
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- i2c-mux-idle-disconnect: Boolean; if defined, forces mux to disconnect all
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children in idle state. This is necessary for example, if there are several
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multiplexers on the bus and the devices behind them use same I2C addresses.
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- gpio-controller: Marks the device node as a GPIO Controller.
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- #gpio-cells: Should be two. The first cell is the pin number and
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the second cell is used to specify flags.
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See ../gpio/gpio.txt for more information.
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- ltc,downstream-accelerators-enable: Enables the rise time accelerators
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on the downstream port.
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- ltc,upstream-accelerators-enable: Enables the rise time accelerators
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on the upstream port.
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Example:
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ltc4306: i2c-mux@4a {
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compatible = "lltc,ltc4306";
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#address-cells = <1>;
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#size-cells = <0>;
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reg = <0x4a>;
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gpio-controller;
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#gpio-cells = <2>;
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i2c@0 {
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#address-cells = <1>;
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#size-cells = <0>;
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reg = <0>;
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eeprom@50 {
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compatible = "at,24c02";
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reg = <0x50>;
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};
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};
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i2c@1 {
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#address-cells = <1>;
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#size-cells = <0>;
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reg = <1>;
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eeprom@50 {
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compatible = "at,24c02";
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reg = <0x50>;
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};
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};
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};
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@ -7698,6 +7698,14 @@ S: Maintained
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F: Documentation/hwmon/ltc4261
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F: drivers/hwmon/ltc4261.c
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LTC4306 I2C MULTIPLEXER DRIVER
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M: Michael Hennerich <michael.hennerich@analog.com>
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W: http://ez.analog.com/community/linux-device-drivers
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L: linux-i2c@vger.kernel.org
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S: Supported
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F: drivers/i2c/muxes/i2c-mux-ltc4306.c
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F: Documentation/devicetree/bindings/i2c/i2c-mux-ltc4306.txt
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LTP (Linux Test Project)
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M: Mike Frysinger <vapier@gentoo.org>
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M: Cyril Hrubis <chrubis@suse.cz>
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@ -395,13 +395,16 @@ int i2c_mux_add_adapter(struct i2c_mux_core *muxc,
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if (force_nr) {
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priv->adap.nr = force_nr;
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ret = i2c_add_numbered_adapter(&priv->adap);
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dev_err(&parent->dev,
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"failed to add mux-adapter %u as bus %u (error=%d)\n",
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chan_id, force_nr, ret);
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} else {
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ret = i2c_add_adapter(&priv->adap);
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dev_err(&parent->dev,
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"failed to add mux-adapter %u (error=%d)\n",
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chan_id, ret);
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}
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if (ret < 0) {
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dev_err(&parent->dev,
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"failed to add mux-adapter (error=%d)\n",
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ret);
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kfree(priv);
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return ret;
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}
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@ -30,6 +30,17 @@ config I2C_MUX_GPIO
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This driver can also be built as a module. If so, the module
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will be called i2c-mux-gpio.
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config I2C_MUX_LTC4306
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tristate "LTC LTC4306/5 I2C multiplexer"
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select GPIOLIB
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select REGMAP_I2C
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help
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If you say yes here you get support for the Analog Devices
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LTC4306 or LTC4305 I2C mux/switch devices.
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This driver can also be built as a module. If so, the module
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will be called i2c-mux-ltc4306.
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config I2C_MUX_PCA9541
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tristate "NXP PCA9541 I2C Master Selector"
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help
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@ -6,6 +6,7 @@ obj-$(CONFIG_I2C_ARB_GPIO_CHALLENGE) += i2c-arb-gpio-challenge.o
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obj-$(CONFIG_I2C_DEMUX_PINCTRL) += i2c-demux-pinctrl.o
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obj-$(CONFIG_I2C_MUX_GPIO) += i2c-mux-gpio.o
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obj-$(CONFIG_I2C_MUX_LTC4306) += i2c-mux-ltc4306.o
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obj-$(CONFIG_I2C_MUX_MLXCPLD) += i2c-mux-mlxcpld.o
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obj-$(CONFIG_I2C_MUX_PCA9541) += i2c-mux-pca9541.o
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obj-$(CONFIG_I2C_MUX_PCA954x) += i2c-mux-pca954x.o
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@ -202,10 +202,8 @@ static int i2c_arbitrator_probe(struct platform_device *pdev)
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/* Actually add the mux adapter */
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ret = i2c_mux_add_adapter(muxc, 0, 0, 0);
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if (ret) {
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dev_err(dev, "Failed to add adapter\n");
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if (ret)
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i2c_put_adapter(muxc->parent);
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}
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return ret;
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}
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@ -245,10 +245,8 @@ static int i2c_mux_gpio_probe(struct platform_device *pdev)
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unsigned int class = mux->data.classes ? mux->data.classes[i] : 0;
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ret = i2c_mux_add_adapter(muxc, nr, mux->data.values[i], class);
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if (ret) {
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dev_err(&pdev->dev, "Failed to add adapter %d\n", i);
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if (ret)
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goto add_adapter_failed;
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}
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}
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dev_info(&pdev->dev, "%d port mux on %s adapter\n",
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322
drivers/i2c/muxes/i2c-mux-ltc4306.c
Normal file
322
drivers/i2c/muxes/i2c-mux-ltc4306.c
Normal file
@ -0,0 +1,322 @@
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/*
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* Linear Technology LTC4306 and LTC4305 I2C multiplexer/switch
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*
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* Copyright (C) 2017 Analog Devices Inc.
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*
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* Licensed under the GPL-2.
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*
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* Based on: i2c-mux-pca954x.c
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*
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* Datasheet: http://cds.linear.com/docs/en/datasheet/4306.pdf
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*/
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#include <linux/gpio/consumer.h>
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#include <linux/gpio/driver.h>
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#include <linux/i2c-mux.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/property.h>
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#include <linux/regmap.h>
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#include <linux/slab.h>
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#define LTC4305_MAX_NCHANS 2
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#define LTC4306_MAX_NCHANS 4
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#define LTC_REG_STATUS 0x0
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#define LTC_REG_CONFIG 0x1
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#define LTC_REG_MODE 0x2
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#define LTC_REG_SWITCH 0x3
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#define LTC_DOWNSTREAM_ACCL_EN BIT(6)
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#define LTC_UPSTREAM_ACCL_EN BIT(7)
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#define LTC_GPIO_ALL_INPUT 0xC0
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#define LTC_SWITCH_MASK 0xF0
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enum ltc_type {
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ltc_4305,
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ltc_4306,
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};
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struct chip_desc {
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u8 nchans;
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u8 num_gpios;
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};
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struct ltc4306 {
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struct regmap *regmap;
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struct gpio_chip gpiochip;
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const struct chip_desc *chip;
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};
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static const struct chip_desc chips[] = {
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[ltc_4305] = {
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.nchans = LTC4305_MAX_NCHANS,
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},
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[ltc_4306] = {
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.nchans = LTC4306_MAX_NCHANS,
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.num_gpios = 2,
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},
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};
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static bool ltc4306_is_volatile_reg(struct device *dev, unsigned int reg)
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{
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return (reg == LTC_REG_CONFIG) ? true : false;
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}
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static const struct regmap_config ltc4306_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = LTC_REG_SWITCH,
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.volatile_reg = ltc4306_is_volatile_reg,
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.cache_type = REGCACHE_FLAT,
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};
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static int ltc4306_gpio_get(struct gpio_chip *chip, unsigned int offset)
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{
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struct ltc4306 *data = gpiochip_get_data(chip);
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unsigned int val;
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int ret;
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ret = regmap_read(data->regmap, LTC_REG_CONFIG, &val);
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if (ret < 0)
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return ret;
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return !!(val & BIT(1 - offset));
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}
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static void ltc4306_gpio_set(struct gpio_chip *chip, unsigned int offset,
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int value)
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{
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struct ltc4306 *data = gpiochip_get_data(chip);
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regmap_update_bits(data->regmap, LTC_REG_CONFIG, BIT(5 - offset),
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value ? BIT(5 - offset) : 0);
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}
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static int ltc4306_gpio_get_direction(struct gpio_chip *chip,
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unsigned int offset)
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{
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struct ltc4306 *data = gpiochip_get_data(chip);
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unsigned int val;
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int ret;
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ret = regmap_read(data->regmap, LTC_REG_MODE, &val);
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if (ret < 0)
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return ret;
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return !!(val & BIT(7 - offset));
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}
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static int ltc4306_gpio_direction_input(struct gpio_chip *chip,
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unsigned int offset)
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{
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struct ltc4306 *data = gpiochip_get_data(chip);
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return regmap_update_bits(data->regmap, LTC_REG_MODE,
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BIT(7 - offset), BIT(7 - offset));
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}
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static int ltc4306_gpio_direction_output(struct gpio_chip *chip,
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unsigned int offset, int value)
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{
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struct ltc4306 *data = gpiochip_get_data(chip);
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ltc4306_gpio_set(chip, offset, value);
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return regmap_update_bits(data->regmap, LTC_REG_MODE,
|
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BIT(7 - offset), 0);
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}
|
||||
|
||||
static int ltc4306_gpio_set_config(struct gpio_chip *chip,
|
||||
unsigned int offset, unsigned long config)
|
||||
{
|
||||
struct ltc4306 *data = gpiochip_get_data(chip);
|
||||
unsigned int val;
|
||||
|
||||
switch (pinconf_to_config_param(config)) {
|
||||
case PIN_CONFIG_DRIVE_OPEN_DRAIN:
|
||||
val = 0;
|
||||
break;
|
||||
case PIN_CONFIG_DRIVE_PUSH_PULL:
|
||||
val = BIT(4 - offset);
|
||||
break;
|
||||
default:
|
||||
return -ENOTSUPP;
|
||||
}
|
||||
|
||||
return regmap_update_bits(data->regmap, LTC_REG_MODE,
|
||||
BIT(4 - offset), val);
|
||||
}
|
||||
|
||||
static int ltc4306_gpio_init(struct ltc4306 *data)
|
||||
{
|
||||
struct device *dev = regmap_get_device(data->regmap);
|
||||
|
||||
if (!data->chip->num_gpios)
|
||||
return 0;
|
||||
|
||||
data->gpiochip.label = dev_name(dev);
|
||||
data->gpiochip.base = -1;
|
||||
data->gpiochip.ngpio = data->chip->num_gpios;
|
||||
data->gpiochip.parent = dev;
|
||||
data->gpiochip.can_sleep = true;
|
||||
data->gpiochip.get_direction = ltc4306_gpio_get_direction;
|
||||
data->gpiochip.direction_input = ltc4306_gpio_direction_input;
|
||||
data->gpiochip.direction_output = ltc4306_gpio_direction_output;
|
||||
data->gpiochip.get = ltc4306_gpio_get;
|
||||
data->gpiochip.set = ltc4306_gpio_set;
|
||||
data->gpiochip.set_config = ltc4306_gpio_set_config;
|
||||
data->gpiochip.owner = THIS_MODULE;
|
||||
|
||||
/* gpiolib assumes all GPIOs default input */
|
||||
regmap_write(data->regmap, LTC_REG_MODE, LTC_GPIO_ALL_INPUT);
|
||||
|
||||
return devm_gpiochip_add_data(dev, &data->gpiochip, data);
|
||||
}
|
||||
|
||||
static int ltc4306_select_mux(struct i2c_mux_core *muxc, u32 chan)
|
||||
{
|
||||
struct ltc4306 *data = i2c_mux_priv(muxc);
|
||||
|
||||
return regmap_update_bits(data->regmap, LTC_REG_SWITCH,
|
||||
LTC_SWITCH_MASK, BIT(7 - chan));
|
||||
}
|
||||
|
||||
static int ltc4306_deselect_mux(struct i2c_mux_core *muxc, u32 chan)
|
||||
{
|
||||
struct ltc4306 *data = i2c_mux_priv(muxc);
|
||||
|
||||
return regmap_update_bits(data->regmap, LTC_REG_SWITCH,
|
||||
LTC_SWITCH_MASK, 0);
|
||||
}
|
||||
|
||||
static const struct i2c_device_id ltc4306_id[] = {
|
||||
{ "ltc4305", ltc_4305 },
|
||||
{ "ltc4306", ltc_4306 },
|
||||
{ }
|
||||
};
|
||||
MODULE_DEVICE_TABLE(i2c, ltc4306_id);
|
||||
|
||||
static const struct of_device_id ltc4306_of_match[] = {
|
||||
{ .compatible = "lltc,ltc4305", .data = &chips[ltc_4305] },
|
||||
{ .compatible = "lltc,ltc4306", .data = &chips[ltc_4306] },
|
||||
{ }
|
||||
};
|
||||
MODULE_DEVICE_TABLE(of, ltc4306_of_match);
|
||||
|
||||
static int ltc4306_probe(struct i2c_client *client,
|
||||
const struct i2c_device_id *id)
|
||||
{
|
||||
struct i2c_adapter *adap = to_i2c_adapter(client->dev.parent);
|
||||
const struct chip_desc *chip;
|
||||
struct i2c_mux_core *muxc;
|
||||
struct ltc4306 *data;
|
||||
struct gpio_desc *gpio;
|
||||
bool idle_disc;
|
||||
unsigned int val = 0;
|
||||
int num, ret;
|
||||
|
||||
chip = of_device_get_match_data(&client->dev);
|
||||
|
||||
if (!chip)
|
||||
chip = &chips[id->driver_data];
|
||||
|
||||
idle_disc = device_property_read_bool(&client->dev,
|
||||
"i2c-mux-idle-disconnect");
|
||||
|
||||
muxc = i2c_mux_alloc(adap, &client->dev,
|
||||
chip->nchans, sizeof(*data),
|
||||
I2C_MUX_LOCKED, ltc4306_select_mux,
|
||||
idle_disc ? ltc4306_deselect_mux : NULL);
|
||||
if (!muxc)
|
||||
return -ENOMEM;
|
||||
data = i2c_mux_priv(muxc);
|
||||
data->chip = chip;
|
||||
|
||||
i2c_set_clientdata(client, muxc);
|
||||
|
||||
data->regmap = devm_regmap_init_i2c(client, <c4306_regmap_config);
|
||||
if (IS_ERR(data->regmap)) {
|
||||
ret = PTR_ERR(data->regmap);
|
||||
dev_err(&client->dev, "Failed to allocate register map: %d\n",
|
||||
ret);
|
||||
return ret;
|
||||
}
|
||||
|
||||
/* Reset and enable the mux if an enable GPIO is specified. */
|
||||
gpio = devm_gpiod_get_optional(&client->dev, "enable", GPIOD_OUT_LOW);
|
||||
if (IS_ERR(gpio))
|
||||
return PTR_ERR(gpio);
|
||||
|
||||
if (gpio) {
|
||||
udelay(1);
|
||||
gpiod_set_value(gpio, 1);
|
||||
}
|
||||
|
||||
/*
|
||||
* Write the mux register at addr to verify
|
||||
* that the mux is in fact present. This also
|
||||
* initializes the mux to disconnected state.
|
||||
*/
|
||||
if (regmap_write(data->regmap, LTC_REG_SWITCH, 0) < 0) {
|
||||
dev_warn(&client->dev, "probe failed\n");
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
if (device_property_read_bool(&client->dev,
|
||||
"ltc,downstream-accelerators-enable"))
|
||||
val |= LTC_DOWNSTREAM_ACCL_EN;
|
||||
|
||||
if (device_property_read_bool(&client->dev,
|
||||
"ltc,upstream-accelerators-enable"))
|
||||
val |= LTC_UPSTREAM_ACCL_EN;
|
||||
|
||||
if (regmap_write(data->regmap, LTC_REG_CONFIG, val) < 0)
|
||||
return -ENODEV;
|
||||
|
||||
ret = ltc4306_gpio_init(data);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
/* Now create an adapter for each channel */
|
||||
for (num = 0; num < chip->nchans; num++) {
|
||||
ret = i2c_mux_add_adapter(muxc, 0, num, 0);
|
||||
if (ret) {
|
||||
i2c_mux_del_adapters(muxc);
|
||||
return ret;
|
||||
}
|
||||
}
|
||||
|
||||
dev_info(&client->dev,
|
||||
"registered %d multiplexed busses for I2C switch %s\n",
|
||||
num, client->name);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int ltc4306_remove(struct i2c_client *client)
|
||||
{
|
||||
struct i2c_mux_core *muxc = i2c_get_clientdata(client);
|
||||
|
||||
i2c_mux_del_adapters(muxc);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct i2c_driver ltc4306_driver = {
|
||||
.driver = {
|
||||
.name = "ltc4306",
|
||||
.of_match_table = of_match_ptr(ltc4306_of_match),
|
||||
},
|
||||
.probe = ltc4306_probe,
|
||||
.remove = ltc4306_remove,
|
||||
.id_table = ltc4306_id,
|
||||
};
|
||||
|
||||
module_i2c_driver(ltc4306_driver);
|
||||
|
||||
MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
|
||||
MODULE_DESCRIPTION("Linear Technology LTC4306, LTC4305 I2C mux/switch driver");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
@ -369,10 +369,8 @@ static int pca9541_probe(struct i2c_client *client,
|
||||
i2c_set_clientdata(client, muxc);
|
||||
|
||||
ret = i2c_mux_add_adapter(muxc, force, 0, 0);
|
||||
if (ret) {
|
||||
dev_err(&client->dev, "failed to register master selector\n");
|
||||
if (ret)
|
||||
return ret;
|
||||
}
|
||||
|
||||
dev_info(&client->dev, "registered master selector for I2C %s\n",
|
||||
client->name);
|
||||
|
||||
@ -85,7 +85,7 @@ struct pca954x {
|
||||
|
||||
struct irq_domain *irq;
|
||||
unsigned int irq_mask;
|
||||
spinlock_t lock;
|
||||
raw_spinlock_t lock;
|
||||
};
|
||||
|
||||
/* Provide specs for the PCA954x types we know about */
|
||||
@ -264,13 +264,13 @@ static void pca954x_irq_mask(struct irq_data *idata)
|
||||
unsigned int pos = idata->hwirq;
|
||||
unsigned long flags;
|
||||
|
||||
spin_lock_irqsave(&data->lock, flags);
|
||||
raw_spin_lock_irqsave(&data->lock, flags);
|
||||
|
||||
data->irq_mask &= ~BIT(pos);
|
||||
if (!data->irq_mask)
|
||||
disable_irq(data->client->irq);
|
||||
|
||||
spin_unlock_irqrestore(&data->lock, flags);
|
||||
raw_spin_unlock_irqrestore(&data->lock, flags);
|
||||
}
|
||||
|
||||
static void pca954x_irq_unmask(struct irq_data *idata)
|
||||
@ -279,13 +279,13 @@ static void pca954x_irq_unmask(struct irq_data *idata)
|
||||
unsigned int pos = idata->hwirq;
|
||||
unsigned long flags;
|
||||
|
||||
spin_lock_irqsave(&data->lock, flags);
|
||||
raw_spin_lock_irqsave(&data->lock, flags);
|
||||
|
||||
if (!data->irq_mask)
|
||||
enable_irq(data->client->irq);
|
||||
data->irq_mask |= BIT(pos);
|
||||
|
||||
spin_unlock_irqrestore(&data->lock, flags);
|
||||
raw_spin_unlock_irqrestore(&data->lock, flags);
|
||||
}
|
||||
|
||||
static int pca954x_irq_set_type(struct irq_data *idata, unsigned int type)
|
||||
@ -311,7 +311,7 @@ static int pca954x_irq_setup(struct i2c_mux_core *muxc)
|
||||
if (!data->chip->has_irq || client->irq <= 0)
|
||||
return 0;
|
||||
|
||||
spin_lock_init(&data->lock);
|
||||
raw_spin_lock_init(&data->lock);
|
||||
|
||||
data->irq = irq_domain_add_linear(client->dev.of_node,
|
||||
data->chip->nchans,
|
||||
@ -434,13 +434,8 @@ static int pca954x_probe(struct i2c_client *client,
|
||||
idle_disconnect_dt) << num;
|
||||
|
||||
ret = i2c_mux_add_adapter(muxc, force, num, class);
|
||||
|
||||
if (ret) {
|
||||
dev_err(&client->dev,
|
||||
"failed to register multiplexed adapter"
|
||||
" %d as bus %d\n", num, force);
|
||||
if (ret)
|
||||
goto fail_del_adapters;
|
||||
}
|
||||
}
|
||||
|
||||
dev_info(&client->dev,
|
||||
|
||||
@ -245,10 +245,8 @@ static int i2c_mux_pinctrl_probe(struct platform_device *pdev)
|
||||
(mux->pdata->base_bus_num + i) : 0;
|
||||
|
||||
ret = i2c_mux_add_adapter(muxc, bus, i, 0);
|
||||
if (ret) {
|
||||
dev_err(&pdev->dev, "Failed to add adapter %d\n", i);
|
||||
if (ret)
|
||||
goto err_del_adapter;
|
||||
}
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
||||
@ -222,10 +222,8 @@ static int i2c_mux_reg_probe(struct platform_device *pdev)
|
||||
class = mux->data.classes ? mux->data.classes[i] : 0;
|
||||
|
||||
ret = i2c_mux_add_adapter(muxc, nr, mux->data.values[i], class);
|
||||
if (ret) {
|
||||
dev_err(&pdev->dev, "Failed to add adapter %d\n", i);
|
||||
if (ret)
|
||||
goto add_adapter_failed;
|
||||
}
|
||||
}
|
||||
|
||||
dev_dbg(&pdev->dev, "%d port mux on %s adapter\n",
|
||||
|
||||
Loading…
Reference in New Issue
Block a user