| /* Copyright (c) 2016, The Linux Foundation. All rights reserved. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 and |
| * only version 2 as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/init.h> |
| #include <linux/err.h> |
| #include <linux/module.h> |
| #include <linux/of.h> |
| #include <linux/of_device.h> |
| #include <linux/platform_device.h> |
| #include <linux/gpio.h> |
| #include <linux/of_gpio.h> |
| #include <linux/mfd/wcd9xxx/wcd-gpio-ctrl.h> |
| |
| struct wcd_gpio_pinctrl_info { |
| struct pinctrl *pinctrl; |
| struct pinctrl_state *pinctrl_active; |
| struct pinctrl_state *pinctrl_sleep; |
| }; |
| |
| static struct wcd_gpio_pinctrl_info *wcd_gpio_get_gpiodata( |
| struct device_node *np) |
| { |
| struct platform_device *pdev; |
| struct wcd_gpio_pinctrl_info *gpio_data; |
| |
| if (!np) { |
| pr_err("%s: device node is null\n", __func__); |
| return NULL; |
| } |
| |
| pdev = of_find_device_by_node(np); |
| if (!pdev) { |
| pr_err("%s: platform device not found!\n", __func__); |
| return NULL; |
| } |
| |
| gpio_data = dev_get_drvdata(&pdev->dev); |
| if (!gpio_data) |
| dev_err(&pdev->dev, "%s: cannot find cdc gpio info\n", |
| __func__); |
| |
| return gpio_data; |
| } |
| |
| /* |
| * wcd_gpio_ctrl_select_sleep_state: select pinctrl sleep state |
| * @np: pointer to struct device_node |
| * |
| * Returns error code for failure |
| */ |
| int wcd_gpio_ctrl_select_sleep_state(struct device_node *np) |
| { |
| struct wcd_gpio_pinctrl_info *gpio_data; |
| |
| gpio_data = wcd_gpio_get_gpiodata(np); |
| if (!gpio_data) |
| return -EINVAL; |
| |
| if (!gpio_data->pinctrl_sleep) { |
| pr_err("%s: pinctrl sleep state is null\n", __func__); |
| return -EINVAL; |
| } |
| |
| return pinctrl_select_state(gpio_data->pinctrl, |
| gpio_data->pinctrl_sleep); |
| } |
| EXPORT_SYMBOL(wcd_gpio_ctrl_select_sleep_state); |
| |
| /* |
| * wcd_gpio_ctrl_select_active_state: select pinctrl active state |
| * @np: pointer to struct device_node |
| * |
| * Returns error code for failure |
| */ |
| int wcd_gpio_ctrl_select_active_state(struct device_node *np) |
| { |
| struct wcd_gpio_pinctrl_info *gpio_data; |
| |
| gpio_data = wcd_gpio_get_gpiodata(np); |
| if (!gpio_data) |
| return -EINVAL; |
| |
| if (!gpio_data->pinctrl_active) { |
| pr_err("%s: pinctrl active state is null\n", __func__); |
| return -EINVAL; |
| } |
| |
| return pinctrl_select_state(gpio_data->pinctrl, |
| gpio_data->pinctrl_active); |
| } |
| EXPORT_SYMBOL(wcd_gpio_ctrl_select_active_state); |
| |
| static int wcd_gpio_ctrl_probe(struct platform_device *pdev) |
| { |
| int ret = 0; |
| struct wcd_gpio_pinctrl_info *gpio_data; |
| |
| gpio_data = devm_kzalloc(&pdev->dev, |
| sizeof(struct wcd_gpio_pinctrl_info), |
| GFP_KERNEL); |
| if (!gpio_data) |
| return -ENOMEM; |
| |
| gpio_data->pinctrl = devm_pinctrl_get(&pdev->dev); |
| if (IS_ERR_OR_NULL(gpio_data->pinctrl)) { |
| dev_err(&pdev->dev, "%s: Cannot get cdc gpio pinctrl:%ld\n", |
| __func__, PTR_ERR(gpio_data->pinctrl)); |
| ret = PTR_ERR(gpio_data->pinctrl); |
| goto err_pctrl_get; |
| } |
| |
| gpio_data->pinctrl_active = pinctrl_lookup_state( |
| gpio_data->pinctrl, "aud_active"); |
| if (IS_ERR_OR_NULL(gpio_data->pinctrl_active)) { |
| dev_err(&pdev->dev, "%s: Cannot get aud_active pinctrl state:%ld\n", |
| __func__, PTR_ERR(gpio_data->pinctrl_active)); |
| ret = PTR_ERR(gpio_data->pinctrl_active); |
| goto err_lookup_state; |
| } |
| |
| gpio_data->pinctrl_sleep = pinctrl_lookup_state( |
| gpio_data->pinctrl, "aud_sleep"); |
| if (IS_ERR_OR_NULL(gpio_data->pinctrl_sleep)) { |
| dev_err(&pdev->dev, "%s: Cannot get aud_sleep pinctrl state:%ld\n", |
| __func__, PTR_ERR(gpio_data->pinctrl_sleep)); |
| ret = PTR_ERR(gpio_data->pinctrl_sleep); |
| goto err_lookup_state; |
| } |
| |
| /* Set pinctrl state to aud_sleep by default */ |
| ret = pinctrl_select_state(gpio_data->pinctrl, |
| gpio_data->pinctrl_sleep); |
| if (ret) |
| dev_err(&pdev->dev, "%s: set cdc gpio sleep state fail: %d\n", |
| __func__, ret); |
| |
| dev_set_drvdata(&pdev->dev, gpio_data); |
| return 0; |
| |
| err_lookup_state: |
| devm_pinctrl_put(gpio_data->pinctrl); |
| err_pctrl_get: |
| devm_kfree(&pdev->dev, gpio_data); |
| return ret; |
| } |
| |
| static int wcd_gpio_ctrl_remove(struct platform_device *pdev) |
| { |
| struct wcd_gpio_pinctrl_info *gpio_data; |
| |
| gpio_data = dev_get_drvdata(&pdev->dev); |
| |
| if (gpio_data && gpio_data->pinctrl) |
| devm_pinctrl_put(gpio_data->pinctrl); |
| |
| devm_kfree(&pdev->dev, gpio_data); |
| |
| return 0; |
| } |
| |
| static const struct of_device_id wcd_gpio_ctrl_match[] = { |
| {.compatible = "qcom,wcd-gpio-ctrl"}, |
| {} |
| }; |
| |
| static struct platform_driver wcd_gpio_ctrl_driver = { |
| .driver = { |
| .name = "wcd-gpio-ctrl", |
| .owner = THIS_MODULE, |
| .of_match_table = wcd_gpio_ctrl_match, |
| }, |
| .probe = wcd_gpio_ctrl_probe, |
| .remove = wcd_gpio_ctrl_remove, |
| }; |
| module_platform_driver(wcd_gpio_ctrl_driver); |
| |
| MODULE_DESCRIPTION("WCD GPIO Control module platform driver"); |
| MODULE_LICENSE("GPL v2"); |