diff options
author | 2016-04-11 10:41:07 +0300 | |
---|---|---|
committer | 2016-04-13 08:17:18 +0300 | |
commit | e09b41010ba33a20a87472ee821fa407a5b8da36 (patch) | |
tree | d10dc367189862e7ca5c592f033dc3726e1df4e3 /kernel/drivers/i2c/muxes | |
parent | f93b97fd65072de626c074dbe099a1fff05ce060 (diff) |
These changes are the raw update to linux-4.4.6-rt14. Kernel sources
are taken from kernel.org, and rt patch from the rt wiki download page.
During the rebasing, the following patch collided:
Force tick interrupt and get rid of softirq magic(I70131fb85).
Collisions have been removed because its logic was found on the
source already.
Change-Id: I7f57a4081d9deaa0d9ccfc41a6c8daccdee3b769
Signed-off-by: José Pekkarinen <jose.pekkarinen@nokia.com>
Diffstat (limited to 'kernel/drivers/i2c/muxes')
-rw-r--r-- | kernel/drivers/i2c/muxes/Kconfig | 16 | ||||
-rw-r--r-- | kernel/drivers/i2c/muxes/Makefile | 1 | ||||
-rw-r--r-- | kernel/drivers/i2c/muxes/i2c-arb-gpio-challenge.c | 3 | ||||
-rw-r--r-- | kernel/drivers/i2c/muxes/i2c-mux-gpio.c | 1 | ||||
-rw-r--r-- | kernel/drivers/i2c/muxes/i2c-mux-pca9541.c | 1 | ||||
-rw-r--r-- | kernel/drivers/i2c/muxes/i2c-mux-pca954x.c | 1 | ||||
-rw-r--r-- | kernel/drivers/i2c/muxes/i2c-mux-pinctrl.c | 1 | ||||
-rw-r--r-- | kernel/drivers/i2c/muxes/i2c-mux-reg.c | 290 |
8 files changed, 309 insertions, 5 deletions
diff --git a/kernel/drivers/i2c/muxes/Kconfig b/kernel/drivers/i2c/muxes/Kconfig index f6d313e52..f06b0e246 100644 --- a/kernel/drivers/i2c/muxes/Kconfig +++ b/kernel/drivers/i2c/muxes/Kconfig @@ -7,7 +7,8 @@ menu "Multiplexer I2C Chip support" config I2C_ARB_GPIO_CHALLENGE tristate "GPIO-based I2C arbitration" - depends on GPIOLIB && OF + depends on GPIOLIB || COMPILE_TEST + depends on OF help If you say yes to this option, support will be included for an I2C multimaster arbitration scheme using GPIOs and a challenge & @@ -40,7 +41,7 @@ config I2C_MUX_PCA9541 config I2C_MUX_PCA954x tristate "Philips PCA954x I2C Mux/switches" - depends on GPIOLIB + depends on GPIOLIB || COMPILE_TEST help If you say yes here you get support for the Philips PCA954x I2C mux/switch devices. @@ -60,4 +61,15 @@ config I2C_MUX_PINCTRL This driver can also be built as a module. If so, the module will be called pinctrl-i2cmux. +config I2C_MUX_REG + tristate "Register-based I2C multiplexer" + help + If you say yes to this option, support will be included for a + register based I2C multiplexer. This driver provides access to + I2C busses connected through a MUX, which is controlled + by a single register. + + This driver can also be built as a module. If so, the module + will be called i2c-mux-reg. + endmenu diff --git a/kernel/drivers/i2c/muxes/Makefile b/kernel/drivers/i2c/muxes/Makefile index 465778b5d..e89799b76 100644 --- a/kernel/drivers/i2c/muxes/Makefile +++ b/kernel/drivers/i2c/muxes/Makefile @@ -7,5 +7,6 @@ obj-$(CONFIG_I2C_MUX_GPIO) += i2c-mux-gpio.o obj-$(CONFIG_I2C_MUX_PCA9541) += i2c-mux-pca9541.o obj-$(CONFIG_I2C_MUX_PCA954x) += i2c-mux-pca954x.o obj-$(CONFIG_I2C_MUX_PINCTRL) += i2c-mux-pinctrl.o +obj-$(CONFIG_I2C_MUX_REG) += i2c-mux-reg.o ccflags-$(CONFIG_I2C_DEBUG_BUS) := -DDEBUG diff --git a/kernel/drivers/i2c/muxes/i2c-arb-gpio-challenge.c b/kernel/drivers/i2c/muxes/i2c-arb-gpio-challenge.c index 5cf1b60b6..402e3a6c6 100644 --- a/kernel/drivers/i2c/muxes/i2c-arb-gpio-challenge.c +++ b/kernel/drivers/i2c/muxes/i2c-arb-gpio-challenge.c @@ -196,7 +196,8 @@ static int i2c_arbitrator_probe(struct platform_device *pdev) dev_err(dev, "Cannot parse i2c-parent\n"); return -EINVAL; } - arb->parent = of_find_i2c_adapter_by_node(parent_np); + arb->parent = of_get_i2c_adapter_by_node(parent_np); + of_node_put(parent_np); if (!arb->parent) { dev_err(dev, "Cannot find parent bus\n"); return -EPROBE_DEFER; diff --git a/kernel/drivers/i2c/muxes/i2c-mux-gpio.c b/kernel/drivers/i2c/muxes/i2c-mux-gpio.c index 70db99264..b8e11c16d 100644 --- a/kernel/drivers/i2c/muxes/i2c-mux-gpio.c +++ b/kernel/drivers/i2c/muxes/i2c-mux-gpio.c @@ -76,6 +76,7 @@ static int i2c_mux_gpio_probe_dt(struct gpiomux *mux, return -ENODEV; } adapter = of_find_i2c_adapter_by_node(adapter_np); + of_node_put(adapter_np); if (!adapter) return -EPROBE_DEFER; diff --git a/kernel/drivers/i2c/muxes/i2c-mux-pca9541.c b/kernel/drivers/i2c/muxes/i2c-mux-pca9541.c index 0c8d4d2cb..d0ba424ad 100644 --- a/kernel/drivers/i2c/muxes/i2c-mux-pca9541.c +++ b/kernel/drivers/i2c/muxes/i2c-mux-pca9541.c @@ -386,7 +386,6 @@ static int pca9541_remove(struct i2c_client *client) static struct i2c_driver pca9541_driver = { .driver = { .name = "pca9541", - .owner = THIS_MODULE, }, .probe = pca9541_probe, .remove = pca9541_remove, diff --git a/kernel/drivers/i2c/muxes/i2c-mux-pca954x.c b/kernel/drivers/i2c/muxes/i2c-mux-pca954x.c index ea4aa9dfc..acfcef3d4 100644 --- a/kernel/drivers/i2c/muxes/i2c-mux-pca954x.c +++ b/kernel/drivers/i2c/muxes/i2c-mux-pca954x.c @@ -300,7 +300,6 @@ static struct i2c_driver pca954x_driver = { .driver = { .name = "pca954x", .pm = &pca954x_pm, - .owner = THIS_MODULE, }, .probe = pca954x_probe, .remove = pca954x_remove, diff --git a/kernel/drivers/i2c/muxes/i2c-mux-pinctrl.c b/kernel/drivers/i2c/muxes/i2c-mux-pinctrl.c index b48378c4b..b5a982ba8 100644 --- a/kernel/drivers/i2c/muxes/i2c-mux-pinctrl.c +++ b/kernel/drivers/i2c/muxes/i2c-mux-pinctrl.c @@ -111,6 +111,7 @@ static int i2c_mux_pinctrl_parse_dt(struct i2c_mux_pinctrl *mux, return -ENODEV; } adapter = of_find_i2c_adapter_by_node(adapter_np); + of_node_put(adapter_np); if (!adapter) { dev_err(mux->dev, "Cannot find parent bus\n"); return -EPROBE_DEFER; diff --git a/kernel/drivers/i2c/muxes/i2c-mux-reg.c b/kernel/drivers/i2c/muxes/i2c-mux-reg.c new file mode 100644 index 000000000..5fbd5bd08 --- /dev/null +++ b/kernel/drivers/i2c/muxes/i2c-mux-reg.c @@ -0,0 +1,290 @@ +/* + * I2C multiplexer using a single register + * + * Copyright 2015 Freescale Semiconductor + * York Sun <yorksun@freescale.com> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + */ + +#include <linux/i2c.h> +#include <linux/i2c-mux.h> +#include <linux/init.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/of_address.h> +#include <linux/platform_data/i2c-mux-reg.h> +#include <linux/platform_device.h> +#include <linux/slab.h> + +struct regmux { + struct i2c_adapter *parent; + struct i2c_adapter **adap; /* child busses */ + struct i2c_mux_reg_platform_data data; +}; + +static int i2c_mux_reg_set(const struct regmux *mux, unsigned int chan_id) +{ + if (!mux->data.reg) + return -EINVAL; + + /* + * Write to the register, followed by a read to ensure the write is + * completed on a "posted" bus, for example PCI or write buffers. + * The endianness of reading doesn't matter and the return data + * is not used. + */ + switch (mux->data.reg_size) { + case 4: + if (mux->data.little_endian) + iowrite32(chan_id, mux->data.reg); + else + iowrite32be(chan_id, mux->data.reg); + if (!mux->data.write_only) + ioread32(mux->data.reg); + break; + case 2: + if (mux->data.little_endian) + iowrite16(chan_id, mux->data.reg); + else + iowrite16be(chan_id, mux->data.reg); + if (!mux->data.write_only) + ioread16(mux->data.reg); + break; + case 1: + iowrite8(chan_id, mux->data.reg); + if (!mux->data.write_only) + ioread8(mux->data.reg); + break; + } + + return 0; +} + +static int i2c_mux_reg_select(struct i2c_adapter *adap, void *data, + unsigned int chan) +{ + struct regmux *mux = data; + + return i2c_mux_reg_set(mux, chan); +} + +static int i2c_mux_reg_deselect(struct i2c_adapter *adap, void *data, + unsigned int chan) +{ + struct regmux *mux = data; + + if (mux->data.idle_in_use) + return i2c_mux_reg_set(mux, mux->data.idle); + + return 0; +} + +#ifdef CONFIG_OF +static int i2c_mux_reg_probe_dt(struct regmux *mux, + struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + struct device_node *adapter_np, *child; + struct i2c_adapter *adapter; + struct resource res; + unsigned *values; + int i = 0; + + if (!np) + return -ENODEV; + + adapter_np = of_parse_phandle(np, "i2c-parent", 0); + if (!adapter_np) { + dev_err(&pdev->dev, "Cannot parse i2c-parent\n"); + return -ENODEV; + } + adapter = of_find_i2c_adapter_by_node(adapter_np); + of_node_put(adapter_np); + if (!adapter) + return -EPROBE_DEFER; + + mux->parent = adapter; + mux->data.parent = i2c_adapter_id(adapter); + put_device(&adapter->dev); + + mux->data.n_values = of_get_child_count(np); + if (of_find_property(np, "little-endian", NULL)) { + mux->data.little_endian = true; + } else if (of_find_property(np, "big-endian", NULL)) { + mux->data.little_endian = false; + } else { +#if defined(__BYTE_ORDER) ? __BYTE_ORDER == __LITTLE_ENDIAN : \ + defined(__LITTLE_ENDIAN) + mux->data.little_endian = true; +#elif defined(__BYTE_ORDER) ? __BYTE_ORDER == __BIG_ENDIAN : \ + defined(__BIG_ENDIAN) + mux->data.little_endian = false; +#else +#error Endianness not defined? +#endif + } + if (of_find_property(np, "write-only", NULL)) + mux->data.write_only = true; + else + mux->data.write_only = false; + + values = devm_kzalloc(&pdev->dev, + sizeof(*mux->data.values) * mux->data.n_values, + GFP_KERNEL); + if (!values) { + dev_err(&pdev->dev, "Cannot allocate values array"); + return -ENOMEM; + } + + for_each_child_of_node(np, child) { + of_property_read_u32(child, "reg", values + i); + i++; + } + mux->data.values = values; + + if (!of_property_read_u32(np, "idle-state", &mux->data.idle)) + mux->data.idle_in_use = true; + + /* map address from "reg" if exists */ + if (of_address_to_resource(np, 0, &res)) { + mux->data.reg_size = resource_size(&res); + mux->data.reg = devm_ioremap_resource(&pdev->dev, &res); + if (IS_ERR(mux->data.reg)) + return PTR_ERR(mux->data.reg); + } + + return 0; +} +#else +static int i2c_mux_reg_probe_dt(struct regmux *mux, + struct platform_device *pdev) +{ + return 0; +} +#endif + +static int i2c_mux_reg_probe(struct platform_device *pdev) +{ + struct regmux *mux; + struct i2c_adapter *parent; + struct resource *res; + int (*deselect)(struct i2c_adapter *, void *, u32); + unsigned int class; + int i, ret, nr; + + mux = devm_kzalloc(&pdev->dev, sizeof(*mux), GFP_KERNEL); + if (!mux) + return -ENOMEM; + + platform_set_drvdata(pdev, mux); + + if (dev_get_platdata(&pdev->dev)) { + memcpy(&mux->data, dev_get_platdata(&pdev->dev), + sizeof(mux->data)); + + parent = i2c_get_adapter(mux->data.parent); + if (!parent) + return -EPROBE_DEFER; + + mux->parent = parent; + } else { + ret = i2c_mux_reg_probe_dt(mux, pdev); + if (ret < 0) { + dev_err(&pdev->dev, "Error parsing device tree"); + return ret; + } + } + + if (!mux->data.reg) { + dev_info(&pdev->dev, + "Register not set, using platform resource\n"); + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + mux->data.reg_size = resource_size(res); + mux->data.reg = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(mux->data.reg)) + return PTR_ERR(mux->data.reg); + } + + if (mux->data.reg_size != 4 && mux->data.reg_size != 2 && + mux->data.reg_size != 1) { + dev_err(&pdev->dev, "Invalid register size\n"); + return -EINVAL; + } + + mux->adap = devm_kzalloc(&pdev->dev, + sizeof(*mux->adap) * mux->data.n_values, + GFP_KERNEL); + if (!mux->adap) { + dev_err(&pdev->dev, "Cannot allocate i2c_adapter structure"); + return -ENOMEM; + } + + if (mux->data.idle_in_use) + deselect = i2c_mux_reg_deselect; + else + deselect = NULL; + + for (i = 0; i < mux->data.n_values; i++) { + nr = mux->data.base_nr ? (mux->data.base_nr + i) : 0; + class = mux->data.classes ? mux->data.classes[i] : 0; + + mux->adap[i] = i2c_add_mux_adapter(mux->parent, &pdev->dev, mux, + nr, mux->data.values[i], + class, i2c_mux_reg_select, + deselect); + if (!mux->adap[i]) { + ret = -ENODEV; + dev_err(&pdev->dev, "Failed to add adapter %d\n", i); + goto add_adapter_failed; + } + } + + dev_dbg(&pdev->dev, "%d port mux on %s adapter\n", + mux->data.n_values, mux->parent->name); + + return 0; + +add_adapter_failed: + for (; i > 0; i--) + i2c_del_mux_adapter(mux->adap[i - 1]); + + return ret; +} + +static int i2c_mux_reg_remove(struct platform_device *pdev) +{ + struct regmux *mux = platform_get_drvdata(pdev); + int i; + + for (i = 0; i < mux->data.n_values; i++) + i2c_del_mux_adapter(mux->adap[i]); + + i2c_put_adapter(mux->parent); + + return 0; +} + +static const struct of_device_id i2c_mux_reg_of_match[] = { + { .compatible = "i2c-mux-reg", }, + {}, +}; +MODULE_DEVICE_TABLE(of, i2c_mux_reg_of_match); + +static struct platform_driver i2c_mux_reg_driver = { + .probe = i2c_mux_reg_probe, + .remove = i2c_mux_reg_remove, + .driver = { + .name = "i2c-mux-reg", + }, +}; + +module_platform_driver(i2c_mux_reg_driver); + +MODULE_DESCRIPTION("Register-based I2C multiplexer driver"); +MODULE_AUTHOR("York Sun <yorksun@freescale.com>"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:i2c-mux-reg"); |