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259 lines
6.6 KiB
259 lines
6.6 KiB
/* Copyright (c) 2016-2017, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/err.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/platform_device.h>
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#include <linux/gpio.h>
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#include <linux/of_gpio.h>
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#include "msm-cdc-pinctrl.h"
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struct msm_cdc_pinctrl_info {
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struct pinctrl *pinctrl;
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struct pinctrl_state *pinctrl_active;
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struct pinctrl_state *pinctrl_sleep;
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int gpio;
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bool state;
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};
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static struct msm_cdc_pinctrl_info *msm_cdc_pinctrl_get_gpiodata(
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struct device_node *np)
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{
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struct platform_device *pdev;
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struct msm_cdc_pinctrl_info *gpio_data;
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if (!np) {
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pr_err("%s: device node is null\n", __func__);
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return NULL;
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}
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pdev = of_find_device_by_node(np);
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if (!pdev) {
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pr_err("%s: platform device not found!\n", __func__);
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return NULL;
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}
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gpio_data = dev_get_drvdata(&pdev->dev);
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if (!gpio_data)
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dev_err(&pdev->dev, "%s: cannot find cdc gpio info\n",
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__func__);
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return gpio_data;
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}
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/*
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* msm_cdc_get_gpio_state: select pinctrl sleep state
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* @np: pointer to struct device_node
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*
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* Returns error code for failure and GPIO value on success
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*/
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int msm_cdc_get_gpio_state(struct device_node *np)
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{
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struct msm_cdc_pinctrl_info *gpio_data;
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int value = -EINVAL;
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gpio_data = msm_cdc_pinctrl_get_gpiodata(np);
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if (!gpio_data)
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return value;
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if (gpio_is_valid(gpio_data->gpio))
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value = gpio_get_value_cansleep(gpio_data->gpio);
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return value;
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}
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EXPORT_SYMBOL(msm_cdc_get_gpio_state);
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/*
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* msm_cdc_pinctrl_select_sleep_state: select pinctrl sleep state
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* @np: pointer to struct device_node
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*
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* Returns error code for failure
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*/
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int msm_cdc_pinctrl_select_sleep_state(struct device_node *np)
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{
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struct msm_cdc_pinctrl_info *gpio_data;
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gpio_data = msm_cdc_pinctrl_get_gpiodata(np);
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if (!gpio_data)
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return -EINVAL;
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if (!gpio_data->pinctrl_sleep) {
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pr_err("%s: pinctrl sleep state is null\n", __func__);
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return -EINVAL;
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}
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gpio_data->state = false;
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return pinctrl_select_state(gpio_data->pinctrl,
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gpio_data->pinctrl_sleep);
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}
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EXPORT_SYMBOL(msm_cdc_pinctrl_select_sleep_state);
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/*
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* msm_cdc_pinctrl_select_active_state: select pinctrl active state
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* @np: pointer to struct device_node
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*
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* Returns error code for failure
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*/
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int msm_cdc_pinctrl_select_active_state(struct device_node *np)
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{
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struct msm_cdc_pinctrl_info *gpio_data;
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gpio_data = msm_cdc_pinctrl_get_gpiodata(np);
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if (!gpio_data)
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return -EINVAL;
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if (!gpio_data->pinctrl_active) {
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pr_err("%s: pinctrl active state is null\n", __func__);
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return -EINVAL;
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}
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gpio_data->state = true;
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return pinctrl_select_state(gpio_data->pinctrl,
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gpio_data->pinctrl_active);
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}
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EXPORT_SYMBOL(msm_cdc_pinctrl_select_active_state);
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/*
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* msm_cdc_pinctrl_get_state: get curren pinctrl state
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* @np: pointer to struct device_node
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*
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* Returns 0 for sleep state, 1 for active state
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*/
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bool msm_cdc_pinctrl_get_state(struct device_node *np)
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{
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struct msm_cdc_pinctrl_info *gpio_data;
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gpio_data = msm_cdc_pinctrl_get_gpiodata(np);
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if (!gpio_data)
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return -EINVAL;
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return gpio_data->state;
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}
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EXPORT_SYMBOL(msm_cdc_pinctrl_get_state);
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static int msm_cdc_pinctrl_probe(struct platform_device *pdev)
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{
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int ret = 0;
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struct msm_cdc_pinctrl_info *gpio_data;
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gpio_data = devm_kzalloc(&pdev->dev,
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sizeof(struct msm_cdc_pinctrl_info),
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GFP_KERNEL);
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if (!gpio_data)
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return -ENOMEM;
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gpio_data->pinctrl = devm_pinctrl_get(&pdev->dev);
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if (IS_ERR_OR_NULL(gpio_data->pinctrl)) {
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dev_err(&pdev->dev, "%s: Cannot get cdc gpio pinctrl:%ld\n",
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__func__, PTR_ERR(gpio_data->pinctrl));
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ret = PTR_ERR(gpio_data->pinctrl);
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goto err_pctrl_get;
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}
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gpio_data->pinctrl_active = pinctrl_lookup_state(
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gpio_data->pinctrl, "aud_active");
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if (IS_ERR_OR_NULL(gpio_data->pinctrl_active)) {
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dev_err(&pdev->dev, "%s: Cannot get aud_active pinctrl state:%ld\n",
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__func__, PTR_ERR(gpio_data->pinctrl_active));
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ret = PTR_ERR(gpio_data->pinctrl_active);
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goto err_lookup_state;
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}
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gpio_data->pinctrl_sleep = pinctrl_lookup_state(
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gpio_data->pinctrl, "aud_sleep");
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if (IS_ERR_OR_NULL(gpio_data->pinctrl_sleep)) {
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dev_err(&pdev->dev, "%s: Cannot get aud_sleep pinctrl state:%ld\n",
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__func__, PTR_ERR(gpio_data->pinctrl_sleep));
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ret = PTR_ERR(gpio_data->pinctrl_sleep);
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goto err_lookup_state;
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}
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/* skip setting to sleep state for LPI_TLMM GPIOs */
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if (!of_property_read_bool(pdev->dev.of_node, "qcom,lpi-gpios")) {
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/* Set pinctrl state to aud_sleep by default */
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ret = pinctrl_select_state(gpio_data->pinctrl,
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gpio_data->pinctrl_sleep);
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if (ret)
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dev_err(&pdev->dev, "%s: set cdc gpio sleep state fail: %d\n",
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__func__, ret);
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}
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gpio_data->gpio = of_get_named_gpio(pdev->dev.of_node,
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"qcom,cdc-rst-n-gpio", 0);
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if (gpio_is_valid(gpio_data->gpio)) {
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ret = gpio_request(gpio_data->gpio, "MSM_CDC_RESET");
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if (ret) {
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dev_err(&pdev->dev, "%s: Failed to request gpio %d\n",
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__func__, gpio_data->gpio);
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goto err_lookup_state;
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}
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}
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dev_set_drvdata(&pdev->dev, gpio_data);
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return 0;
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err_lookup_state:
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devm_pinctrl_put(gpio_data->pinctrl);
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err_pctrl_get:
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devm_kfree(&pdev->dev, gpio_data);
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return ret;
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}
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static int msm_cdc_pinctrl_remove(struct platform_device *pdev)
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{
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struct msm_cdc_pinctrl_info *gpio_data;
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gpio_data = dev_get_drvdata(&pdev->dev);
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/* to free the requested gpio before exiting */
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if (gpio_data) {
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if (gpio_is_valid(gpio_data->gpio))
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gpio_free(gpio_data->gpio);
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if (gpio_data->pinctrl)
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devm_pinctrl_put(gpio_data->pinctrl);
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}
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devm_kfree(&pdev->dev, gpio_data);
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return 0;
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}
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static const struct of_device_id msm_cdc_pinctrl_match[] = {
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{.compatible = "qcom,msm-cdc-pinctrl"},
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{}
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};
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static struct platform_driver msm_cdc_pinctrl_driver = {
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.driver = {
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.name = "msm-cdc-pinctrl",
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.owner = THIS_MODULE,
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.of_match_table = msm_cdc_pinctrl_match,
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},
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.probe = msm_cdc_pinctrl_probe,
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.remove = msm_cdc_pinctrl_remove,
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};
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int msm_cdc_pinctrl_drv_init(void)
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{
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return platform_driver_register(&msm_cdc_pinctrl_driver);
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}
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void msm_cdc_pinctrl_drv_exit(void)
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{
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platform_driver_unregister(&msm_cdc_pinctrl_driver);
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}
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MODULE_DESCRIPTION("MSM CODEC pin control platform driver");
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MODULE_LICENSE("GPL v2");
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