Merge tag 'staging-4.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging

Pull staging and IIO updates from Greg KH:
 "Here is the big staging and IIO driver pull request for 4.9-rc1.

  There are a lot of patches in here, the majority due to the
  drivers/staging/greybus/ subsystem being merged in with full
  development history that went back a few years, in order to preserve
  the work that those developers did over time.

  Lots and lots of tiny cleanups happened in the tree as well, due to
  the Outreachy application process and lots of other developers showing
  up for the first time to clean code up.  Along with those changes, we
  deleted a wireless driver, and added a raspberrypi driver (currently
  marked broken), and lots of new iio drivers.

  Overall the tree still shrunk with more lines removed than added,
  about 10 thousand lines removed in total. Full details are in the very
  long shortlog below.

  All of this has been in the linux-next tree with no issues. There will
  be some merge problems with other subsystem trees, but those are all
  minor problems and shouldn't be hard to work out when they happen
  (MAINTAINERS and some lustre build problems with the IB tree)"

And furter from me asking for clarification about greybus:
 "Right now there is a phone from Motorola shipping with this code (a
  slightly older version, but the same tree), so even though Ara is not
  alive in the same form, the functionality is happening. We are working
  with the developers of that phone to merge the newer stuff in with
  their fork so they can use the upstream version in future versions of
  their phone product line.

  Toshiba has at least one chip shipping in their catalog that
  needs/uses this protocol over a Unipro link, and rumor has it that
  there might be more in the future.

  There are also other users of the greybus protocols, there is a talk
  next week at ELC that shows how it is being used across a network
  connection to control a device, and previous ELC talks have showed the
  protocol stack being used over USB to drive embedded Linux boards.
  I've also talked to some people who are starting to work to add a host
  controller driver to control arduinos as the greybus PHY protocols are
  very useful to control a serial/i2c/spio/whatever device across a
  random physical link, as it is a way to have a self-describing device
  be attached to a host without needing manual configuration.

  So yes, people are using it, and there is still the chance that it
  will show up in a phone/laptop/tablet/whatever from Google in the
  future as well, the tech isn't dead, even if the original large phone
  project happens to be"

* tag 'staging-4.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging: (3703 commits)
  Staging: fbtft: Fix bug in fbtft-core
  staging: rtl8188eu: fix double unlock error in rtw_resume_process()
  staging:r8188eu: remove GEN_MLME_EXT_HANDLER macro
  staging:r8188eu: remove GEN_DRV_CMD_HANDLER macro
  staging:r8188eu: remove GEN_EVT_CODE macro
  staging:r8188eu: remove GEN_CMD_CODE macro
  staging:r8188eu: remove pkt_newalloc member of the recv_buf structure
  staging:r8188eu: remove rtw_handle_dualmac declaration
  staging:r8188eu: remove (RGTRY|BSSID)_(OFT|SZ) macros
  staging:r8188eu: change rtl8188e_process_phy_info function argument type
  Staging: fsl-mc: Remove blank lines
  Staging: fsl-mc: Fix unaligned * in block comments
  Staging: comedi: Align the * in block comments
  Staging : ks7010 : Fix block comments warninig
  Staging: vt6655: Remove explicit NULL comparison using Coccinelle
  staging: rtl8188eu: core: rtw_xmit: Use macros instead of constants
  staging: rtl8188eu: core: rtw_xmit: Move constant of the right side
  staging: dgnc: Fix lines longer than 80 characters
  Staging: dgnc: constify attribute_group structures
  Staging: most: hdm-dim2: constify attribute_group structures
  ...

1 files changed, 522 insertions, 0 deletions

diff --git a/drivers/staging/greybus/arche-apb-ctrl.c b/drivers/staging/greybus/arche-apb-ctrl.c
new file mode 100644
index 0000000..70323aa
--- /dev/null
+++ b/drivers/staging/greybus/arche-apb-ctrl.c
@@ -0,0 +1,522 @@
+/*
+ * Arche Platform driver to control APB.
+ *
+ * Copyright 2014-2015 Google Inc.
+ * Copyright 2014-2015 Linaro Ltd.
+ *
+ * Released under the GPLv2 only.
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/gpio.h>
+#include <linux/interrupt.h>
+#include <linux/of_gpio.h>
+#include <linux/of_irq.h>
+#include <linux/module.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/platform_device.h>
+#include <linux/pm.h>
+#include <linux/regulator/consumer.h>
+#include <linux/spinlock.h>
+#include "arche_platform.h"
+
+
+struct arche_apb_ctrl_drvdata {
+	/* Control GPIO signals to and from AP <=> AP Bridges */
+	int resetn_gpio;
+	int boot_ret_gpio;
+	int pwroff_gpio;
+	int wake_in_gpio;
+	int wake_out_gpio;
+	int pwrdn_gpio;
+
+	enum arche_platform_state state;
+	bool init_disabled;
+
+	struct regulator *vcore;
+	struct regulator *vio;
+
+	int clk_en_gpio;
+	struct clk *clk;
+
+	struct pinctrl *pinctrl;
+	struct pinctrl_state *pin_default;
+
+	/* V2: SPI Bus control  */
+	int spi_en_gpio;
+	bool spi_en_polarity_high;
+};
+
+/*
+ * Note that these low level api's are active high
+ */
+static inline void deassert_reset(unsigned int gpio)
+{
+	gpio_set_value(gpio, 1);
+}
+
+static inline void assert_reset(unsigned int gpio)
+{
+	gpio_set_value(gpio, 0);
+}
+
+/*
+ * Note: Please do not modify the below sequence, as it is as per the spec
+ */
+static int coldboot_seq(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct arche_apb_ctrl_drvdata *apb = platform_get_drvdata(pdev);
+	int ret;
+
+	if (apb->init_disabled ||
+			apb->state == ARCHE_PLATFORM_STATE_ACTIVE)
+		return 0;
+
+	/* Hold APB in reset state */
+	assert_reset(apb->resetn_gpio);
+
+	if (apb->state == ARCHE_PLATFORM_STATE_FW_FLASHING &&
+			gpio_is_valid(apb->spi_en_gpio))
+		devm_gpio_free(dev, apb->spi_en_gpio);
+
+	/* Enable power to APB */
+	if (!IS_ERR(apb->vcore)) {
+		ret = regulator_enable(apb->vcore);
+		if (ret) {
+			dev_err(dev, "failed to enable core regulator\n");
+			return ret;
+		}
+	}
+
+	if (!IS_ERR(apb->vio)) {
+		ret = regulator_enable(apb->vio);
+		if (ret) {
+			dev_err(dev, "failed to enable IO regulator\n");
+			return ret;
+		}
+	}
+
+	apb_bootret_deassert(dev);
+
+	/* On DB3 clock was not mandatory */
+	if (gpio_is_valid(apb->clk_en_gpio))
+		gpio_set_value(apb->clk_en_gpio, 1);
+
+	usleep_range(100, 200);
+
+	/* deassert reset to APB : Active-low signal */
+	deassert_reset(apb->resetn_gpio);
+
+	apb->state = ARCHE_PLATFORM_STATE_ACTIVE;
+
+	return 0;
+}
+
+static int fw_flashing_seq(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct arche_apb_ctrl_drvdata *apb = platform_get_drvdata(pdev);
+	int ret;
+
+	if (apb->init_disabled ||
+			apb->state == ARCHE_PLATFORM_STATE_FW_FLASHING)
+		return 0;
+
+	ret = regulator_enable(apb->vcore);
+	if (ret) {
+		dev_err(dev, "failed to enable core regulator\n");
+		return ret;
+	}
+
+	ret = regulator_enable(apb->vio);
+	if (ret) {
+		dev_err(dev, "failed to enable IO regulator\n");
+		return ret;
+	}
+
+	if (gpio_is_valid(apb->spi_en_gpio)) {
+		unsigned long flags;
+
+		if (apb->spi_en_polarity_high)
+			flags = GPIOF_OUT_INIT_HIGH;
+		else
+			flags = GPIOF_OUT_INIT_LOW;
+
+		ret = devm_gpio_request_one(dev, apb->spi_en_gpio,
+				flags, "apb_spi_en");
+		if (ret) {
+			dev_err(dev, "Failed requesting SPI bus en gpio %d\n",
+				apb->spi_en_gpio);
+			return ret;
+		}
+	}
+
+	/* for flashing device should be in reset state */
+	assert_reset(apb->resetn_gpio);
+	apb->state = ARCHE_PLATFORM_STATE_FW_FLASHING;
+
+	return 0;
+}
+
+static int standby_boot_seq(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct arche_apb_ctrl_drvdata *apb = platform_get_drvdata(pdev);
+
+	if (apb->init_disabled)
+		return 0;
+
+	/* Even if it is in OFF state, then we do not want to change the state */
+	if (apb->state == ARCHE_PLATFORM_STATE_STANDBY ||
+			apb->state == ARCHE_PLATFORM_STATE_OFF)
+		return 0;
+
+	if (apb->state == ARCHE_PLATFORM_STATE_FW_FLASHING &&
+			gpio_is_valid(apb->spi_en_gpio))
+		devm_gpio_free(dev, apb->spi_en_gpio);
+
+	/*
+	 * As per WDM spec, do nothing
+	 *
+	 * Pasted from WDM spec,
+	 *  - A falling edge on POWEROFF_L is detected (a)
+	 *  - WDM enters standby mode, but no output signals are changed
+	 * */
+
+	/* TODO: POWEROFF_L is input to WDM module  */
+	apb->state = ARCHE_PLATFORM_STATE_STANDBY;
+	return 0;
+}
+
+static void poweroff_seq(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct arche_apb_ctrl_drvdata *apb = platform_get_drvdata(pdev);
+
+	if (apb->init_disabled || apb->state == ARCHE_PLATFORM_STATE_OFF)
+		return;
+
+	if (apb->state == ARCHE_PLATFORM_STATE_FW_FLASHING &&
+			gpio_is_valid(apb->spi_en_gpio))
+		devm_gpio_free(dev, apb->spi_en_gpio);
+
+	/* disable the clock */
+	if (gpio_is_valid(apb->clk_en_gpio))
+		gpio_set_value(apb->clk_en_gpio, 0);
+
+	if (!IS_ERR(apb->vcore) && regulator_is_enabled(apb->vcore) > 0)
+		regulator_disable(apb->vcore);
+
+	if (!IS_ERR(apb->vio) && regulator_is_enabled(apb->vio) > 0)
+		regulator_disable(apb->vio);
+
+	/* As part of exit, put APB back in reset state */
+	assert_reset(apb->resetn_gpio);
+	apb->state = ARCHE_PLATFORM_STATE_OFF;
+
+	/* TODO: May have to send an event to SVC about this exit */
+}
+
+void apb_bootret_assert(struct device *dev)
+{
+	struct arche_apb_ctrl_drvdata *apb = dev_get_drvdata(dev);
+
+	gpio_set_value(apb->boot_ret_gpio, 1);
+}
+
+void apb_bootret_deassert(struct device *dev)
+{
+	struct arche_apb_ctrl_drvdata *apb = dev_get_drvdata(dev);
+
+	gpio_set_value(apb->boot_ret_gpio, 0);
+}
+
+int apb_ctrl_coldboot(struct device *dev)
+{
+	return coldboot_seq(to_platform_device(dev));
+}
+
+int apb_ctrl_fw_flashing(struct device *dev)
+{
+	return fw_flashing_seq(to_platform_device(dev));
+}
+
+int apb_ctrl_standby_boot(struct device *dev)
+{
+	return standby_boot_seq(to_platform_device(dev));
+}
+
+void apb_ctrl_poweroff(struct device *dev)
+{
+	poweroff_seq(to_platform_device(dev));
+}
+
+static ssize_t state_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t count)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct arche_apb_ctrl_drvdata *apb = platform_get_drvdata(pdev);
+	int ret = 0;
+	bool is_disabled;
+
+	if (sysfs_streq(buf, "off")) {
+		if (apb->state == ARCHE_PLATFORM_STATE_OFF)
+			return count;
+
+		poweroff_seq(pdev);
+	} else if (sysfs_streq(buf, "active")) {
+		if (apb->state == ARCHE_PLATFORM_STATE_ACTIVE)
+			return count;
+
+		poweroff_seq(pdev);
+		is_disabled = apb->init_disabled;
+		apb->init_disabled = false;
+		ret = coldboot_seq(pdev);
+		if (ret)
+			apb->init_disabled = is_disabled;
+	} else if (sysfs_streq(buf, "standby")) {
+		if (apb->state == ARCHE_PLATFORM_STATE_STANDBY)
+			return count;
+
+		ret = standby_boot_seq(pdev);
+	} else if (sysfs_streq(buf, "fw_flashing")) {
+		if (apb->state == ARCHE_PLATFORM_STATE_FW_FLASHING)
+			return count;
+
+		/* First we want to make sure we power off everything
+		 * and then enter FW flashing state */
+		poweroff_seq(pdev);
+		ret = fw_flashing_seq(pdev);
+	} else {
+		dev_err(dev, "unknown state\n");
+		ret = -EINVAL;
+	}
+
+	return ret ? ret : count;
+}
+
+static ssize_t state_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct arche_apb_ctrl_drvdata *apb = dev_get_drvdata(dev);
+
+	switch (apb->state) {
+	case ARCHE_PLATFORM_STATE_OFF:
+		return sprintf(buf, "off%s\n",
+				apb->init_disabled ? ",disabled" : "");
+	case ARCHE_PLATFORM_STATE_ACTIVE:
+		return sprintf(buf, "active\n");
+	case ARCHE_PLATFORM_STATE_STANDBY:
+		return sprintf(buf, "standby\n");
+	case ARCHE_PLATFORM_STATE_FW_FLASHING:
+		return sprintf(buf, "fw_flashing\n");
+	default:
+		return sprintf(buf, "unknown state\n");
+	}
+}
+
+static DEVICE_ATTR_RW(state);
+
+static int apb_ctrl_get_devtree_data(struct platform_device *pdev,
+		struct arche_apb_ctrl_drvdata *apb)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *np = dev->of_node;
+	int ret;
+
+	apb->resetn_gpio = of_get_named_gpio(np, "reset-gpios", 0);
+	if (apb->resetn_gpio < 0) {
+		dev_err(dev, "failed to get reset gpio\n");
+		return apb->resetn_gpio;
+	}
+	ret = devm_gpio_request_one(dev, apb->resetn_gpio,
+			GPIOF_OUT_INIT_LOW, "apb-reset");
+	if (ret) {
+		dev_err(dev, "Failed requesting reset gpio %d\n",
+				apb->resetn_gpio);
+		return ret;
+	}
+
+	apb->boot_ret_gpio = of_get_named_gpio(np, "boot-ret-gpios", 0);
+	if (apb->boot_ret_gpio < 0) {
+		dev_err(dev, "failed to get boot retention gpio\n");
+		return apb->boot_ret_gpio;
+	}
+	ret = devm_gpio_request_one(dev, apb->boot_ret_gpio,
+			GPIOF_OUT_INIT_LOW, "boot retention");
+	if (ret) {
+		dev_err(dev, "Failed requesting bootret gpio %d\n",
+				apb->boot_ret_gpio);
+		return ret;
+	}
+
+	/* It's not mandatory to support power management interface */
+	apb->pwroff_gpio = of_get_named_gpio(np, "pwr-off-gpios", 0);
+	if (apb->pwroff_gpio < 0) {
+		dev_err(dev, "failed to get power off gpio\n");
+		return apb->pwroff_gpio;
+	}
+	ret = devm_gpio_request_one(dev, apb->pwroff_gpio,
+			GPIOF_IN, "pwroff_n");
+	if (ret) {
+		dev_err(dev, "Failed requesting pwroff_n gpio %d\n",
+				apb->pwroff_gpio);
+		return ret;
+	}
+
+	/* Do not make clock mandatory as of now (for DB3) */
+	apb->clk_en_gpio = of_get_named_gpio(np, "clock-en-gpio", 0);
+	if (apb->clk_en_gpio < 0) {
+		dev_warn(dev, "failed to get clock en gpio\n");
+	} else if (gpio_is_valid(apb->clk_en_gpio)) {
+		ret = devm_gpio_request_one(dev, apb->clk_en_gpio,
+				GPIOF_OUT_INIT_LOW, "apb_clk_en");
+		if (ret) {
+			dev_warn(dev, "Failed requesting APB clock en gpio %d\n",
+					apb->clk_en_gpio);
+			return ret;
+		}
+	}
+
+	apb->pwrdn_gpio = of_get_named_gpio(np, "pwr-down-gpios", 0);
+	if (apb->pwrdn_gpio < 0)
+		dev_warn(dev, "failed to get power down gpio\n");
+
+	/* Regulators are optional, as we may have fixed supply coming in */
+	apb->vcore = devm_regulator_get(dev, "vcore");
+	if (IS_ERR(apb->vcore))
+		dev_warn(dev, "no core regulator found\n");
+
+	apb->vio = devm_regulator_get(dev, "vio");
+	if (IS_ERR(apb->vio))
+		dev_warn(dev, "no IO regulator found\n");
+
+	apb->pinctrl = devm_pinctrl_get(&pdev->dev);
+	if (IS_ERR(apb->pinctrl)) {
+		dev_err(&pdev->dev, "could not get pinctrl handle\n");
+		return PTR_ERR(apb->pinctrl);
+	}
+	apb->pin_default = pinctrl_lookup_state(apb->pinctrl, "default");
+	if (IS_ERR(apb->pin_default)) {
+		dev_err(&pdev->dev, "could not get default pin state\n");
+		return PTR_ERR(apb->pin_default);
+	}
+
+	/* Only applicable for platform >= V2 */
+	apb->spi_en_gpio = of_get_named_gpio(np, "spi-en-gpio", 0);
+	if (apb->spi_en_gpio >= 0) {
+		if (of_property_read_bool(pdev->dev.of_node,
+					"spi-en-active-high"))
+			apb->spi_en_polarity_high = true;
+	}
+
+	return 0;
+}
+
+static int arche_apb_ctrl_probe(struct platform_device *pdev)
+{
+	int ret;
+	struct arche_apb_ctrl_drvdata *apb;
+	struct device *dev = &pdev->dev;
+
+	apb = devm_kzalloc(&pdev->dev, sizeof(*apb), GFP_KERNEL);
+	if (!apb)
+		return -ENOMEM;
+
+	ret = apb_ctrl_get_devtree_data(pdev, apb);
+	if (ret) {
+		dev_err(dev, "failed to get apb devicetree data %d\n", ret);
+		return ret;
+	}
+
+	/* Initially set APB to OFF state */
+	apb->state = ARCHE_PLATFORM_STATE_OFF;
+	/* Check whether device needs to be enabled on boot */
+	if (of_property_read_bool(pdev->dev.of_node, "arche,init-disable"))
+		apb->init_disabled = true;
+
+	platform_set_drvdata(pdev, apb);
+
+	/* Create sysfs interface to allow user to change state dynamically */
+	ret = device_create_file(dev, &dev_attr_state);
+	if (ret) {
+		dev_err(dev, "failed to create state file in sysfs\n");
+		return ret;
+	}
+
+	dev_info(&pdev->dev, "Device registered successfully\n");
+	return 0;
+}
+
+static int arche_apb_ctrl_remove(struct platform_device *pdev)
+{
+	device_remove_file(&pdev->dev, &dev_attr_state);
+	poweroff_seq(pdev);
+	platform_set_drvdata(pdev, NULL);
+
+	return 0;
+}
+
+static int arche_apb_ctrl_suspend(struct device *dev)
+{
+	/*
+	 * If timing profile permits, we may shutdown bridge
+	 * completely
+	 *
+	 * TODO: sequence ??
+	 *
+	 * Also, need to make sure we meet precondition for unipro suspend
+	 * Precondition: Definition ???
+	 */
+	return 0;
+}
+
+static int arche_apb_ctrl_resume(struct device *dev)
+{
+	/*
+	 * Atleast for ES2 we have to meet the delay requirement between
+	 * unipro switch and AP bridge init, depending on whether bridge is in
+	 * OFF state or standby state.
+	 *
+	 * Based on whether bridge is in standby or OFF state we may have to
+	 * assert multiple signals. Please refer to WDM spec, for more info.
+	 *
+	 */
+	return 0;
+}
+
+static void arche_apb_ctrl_shutdown(struct platform_device *pdev)
+{
+	apb_ctrl_poweroff(&pdev->dev);
+}
+
+static SIMPLE_DEV_PM_OPS(arche_apb_ctrl_pm_ops, arche_apb_ctrl_suspend,
+			 arche_apb_ctrl_resume);
+
+static const struct of_device_id arche_apb_ctrl_of_match[] = {
+	{ .compatible = "usbffff,2", },
+	{ },
+};
+
+static struct platform_driver arche_apb_ctrl_device_driver = {
+	.probe		= arche_apb_ctrl_probe,
+	.remove		= arche_apb_ctrl_remove,
+	.shutdown	= arche_apb_ctrl_shutdown,
+	.driver		= {
+		.name	= "arche-apb-ctrl",
+		.pm	= &arche_apb_ctrl_pm_ops,
+		.of_match_table = arche_apb_ctrl_of_match,
+	}
+};
+
+int __init arche_apb_init(void)
+{
+	return platform_driver_register(&arche_apb_ctrl_device_driver);
+}
+
+void __exit arche_apb_exit(void)
+{
+	platform_driver_unregister(&arche_apb_ctrl_device_driver);
+}