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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2025-08-26 01:02:46 +00:00
d9d87d90cc
The conversion of all GPIO drivers to using the .set_rv() and .set_multiple_rv() callbacks from struct gpio_chip (which - unlike their predecessors - return an integer and allow the controller drivers to indicate failures to users) is now complete and the legacy ones have been removed. Rename the new callbacks back to their original names in one sweeping change. Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
135 lines
2.9 KiB
C
135 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright 2021~2022 NXP
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*
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* The driver exports a standard gpiochip interface
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* to control the PIN resources on SCU domain.
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*/
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#include <linux/cleanup.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/gpio/driver.h>
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#include <linux/platform_device.h>
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#include <linux/firmware/imx/svc/rm.h>
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#include <dt-bindings/firmware/imx/rsrc.h>
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struct scu_gpio_priv {
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struct gpio_chip chip;
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struct mutex lock;
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struct device *dev;
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struct imx_sc_ipc *handle;
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};
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static unsigned int scu_rsrc_arr[] = {
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IMX_SC_R_BOARD_R0,
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IMX_SC_R_BOARD_R1,
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IMX_SC_R_BOARD_R2,
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IMX_SC_R_BOARD_R3,
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IMX_SC_R_BOARD_R4,
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IMX_SC_R_BOARD_R5,
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IMX_SC_R_BOARD_R6,
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IMX_SC_R_BOARD_R7,
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};
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static int imx_scu_gpio_get(struct gpio_chip *chip, unsigned int offset)
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{
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struct scu_gpio_priv *priv = gpiochip_get_data(chip);
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int level;
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int err;
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scoped_guard(mutex, &priv->lock) {
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/* to read PIN state via scu api */
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err = imx_sc_misc_get_control(priv->handle,
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scu_rsrc_arr[offset], 0, &level);
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}
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if (err) {
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dev_err(priv->dev, "SCU get failed: %d\n", err);
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return err;
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}
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return level;
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}
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static int imx_scu_gpio_set(struct gpio_chip *chip, unsigned int offset,
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int value)
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{
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struct scu_gpio_priv *priv = gpiochip_get_data(chip);
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int err;
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scoped_guard(mutex, &priv->lock) {
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/* to set PIN output level via scu api */
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err = imx_sc_misc_set_control(priv->handle,
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scu_rsrc_arr[offset], 0, value);
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}
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if (err)
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dev_err(priv->dev, "SCU set (%d) failed: %d\n",
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scu_rsrc_arr[offset], err);
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return err;
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}
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static int imx_scu_gpio_get_direction(struct gpio_chip *chip, unsigned int offset)
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{
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return GPIO_LINE_DIRECTION_OUT;
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}
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static int imx_scu_gpio_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct scu_gpio_priv *priv;
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struct gpio_chip *gc;
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int ret;
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priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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ret = imx_scu_get_handle(&priv->handle);
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if (ret)
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return ret;
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priv->dev = dev;
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ret = devm_mutex_init(&pdev->dev, &priv->lock);
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if (ret)
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return ret;
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gc = &priv->chip;
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gc->base = -1;
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gc->parent = dev;
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gc->ngpio = ARRAY_SIZE(scu_rsrc_arr);
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gc->label = dev_name(dev);
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gc->get = imx_scu_gpio_get;
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gc->set = imx_scu_gpio_set;
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gc->get_direction = imx_scu_gpio_get_direction;
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platform_set_drvdata(pdev, priv);
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return devm_gpiochip_add_data(dev, gc, priv);
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}
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static const struct of_device_id imx_scu_gpio_dt_ids[] = {
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{ .compatible = "fsl,imx8qxp-sc-gpio" },
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{ /* sentinel */ }
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};
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static struct platform_driver imx_scu_gpio_driver = {
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.driver = {
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.name = "gpio-imx-scu",
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.of_match_table = imx_scu_gpio_dt_ids,
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},
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.probe = imx_scu_gpio_probe,
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};
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static int __init _imx_scu_gpio_init(void)
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{
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return platform_driver_register(&imx_scu_gpio_driver);
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}
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subsys_initcall_sync(_imx_scu_gpio_init);
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MODULE_AUTHOR("Shenwei Wang <shenwei.wang@nxp.com>");
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MODULE_DESCRIPTION("NXP GPIO over IMX SCU API");
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