346 lines
8.1 KiB
C
346 lines
8.1 KiB
C
/* drivers/motor/dcmotor.c
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* Copyright (C) 2015 Samsung Electronics Co. Ltd. All Rights Reserved.
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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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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*/
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/hrtimer.h>
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#include <linux/err.h>
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#include <linux/regulator/consumer.h>
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#include <linux/of_gpio.h>
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#include <linux/wakelock.h>
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#include <linux/workqueue.h>
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#include "../staging/android/timed_output.h"
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#define SEC_VIB_NAME "sec_vib"
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#define INTERNAL_LDO 0
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#define EXTERNAL_LDO 1
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#define LDO_EN 1
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#define LDO_DIS 0
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struct sec_vib_pdata {
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const char *regulator;
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int max_timeout;
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int ldo_type;
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int gpio_ldo_en;
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};
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struct sec_vib_drvdata {
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struct regulator *regulator;
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struct timed_output_dev dev;
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struct hrtimer timer;
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struct workqueue_struct *workqueue;
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struct work_struct work;
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spinlock_t lock;
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bool running;
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int max_timeout;
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int timeout;
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int ldo_type;
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int gpio_ldo_en;
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};
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int sec_vib_vdd_en(struct timed_output_dev *dev, bool en)
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{
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struct sec_vib_drvdata *ddata =
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container_of(dev, struct sec_vib_drvdata, dev);
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int ret = 0;
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if (en) {
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if (ddata->ldo_type == INTERNAL_LDO) { /* pmic ldo */
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ret = regulator_enable(ddata->regulator);
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}
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else if (ddata->ldo_type == EXTERNAL_LDO) { /* external ldo */
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ret = gpio_direction_output(ddata->gpio_ldo_en, 1);
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}
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}
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else {
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if (ddata->ldo_type == INTERNAL_LDO) { /* pmic ldo */
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ret = regulator_disable(ddata->regulator);
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}
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else if (ddata->ldo_type == EXTERNAL_LDO) { /* external ldo */
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ret = gpio_direction_output(ddata->gpio_ldo_en, 0);
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}
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}
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return 0;
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}
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static enum hrtimer_restart sec_vib_timer_func(struct hrtimer *timer)
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{
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struct sec_vib_drvdata *ddata =
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container_of(timer, struct sec_vib_drvdata, timer);
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ddata->timeout = 0;
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queue_work(ddata->workqueue, &ddata->work);
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return HRTIMER_NORESTART;
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}
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static int sec_vib_get_time(struct timed_output_dev *dev)
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{
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struct sec_vib_drvdata *ddata =
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container_of(dev, struct sec_vib_drvdata, dev);
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if (hrtimer_active(&ddata->timer)) {
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ktime_t r = hrtimer_get_remaining(&ddata->timer);
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struct timeval t = ktime_to_timeval(r);
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return t.tv_sec * 1000 + t.tv_usec / 1000;
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} else
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return 0;
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}
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static void sec_vib_enable(struct timed_output_dev *dev, int value)
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{
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struct sec_vib_drvdata *ddata =
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container_of(dev, struct sec_vib_drvdata, dev);
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unsigned long flags;
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printk("[VIB] %s, timedout = %d \n", __func__, value);
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hrtimer_cancel(&ddata->timer);
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if (value > 0) {
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if (value > ddata->max_timeout)
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value = ddata->max_timeout;
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ddata->timeout = value;
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queue_work(ddata->workqueue, &ddata->work);
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spin_lock_irqsave(&ddata->lock, flags);
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hrtimer_start(&ddata->timer,
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ktime_set(value / 1000, (value % 1000) * 1000000),
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HRTIMER_MODE_REL);
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spin_unlock_irqrestore(&ddata->lock, flags);
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} else {
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ddata->timeout = 0;
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queue_work(ddata->workqueue, &ddata->work);
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}
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}
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static void sec_vib_work(struct work_struct *work)
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{
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struct sec_vib_drvdata *ddata =
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container_of(work, struct sec_vib_drvdata, work);
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printk("[VIB] %s, timedout = %d , running = %d \n", __func__, ddata->timeout, ddata->running );
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if (ddata->timeout > 0) {
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if (ddata->running)
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return;
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sec_vib_vdd_en(&ddata->dev, LDO_EN);
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ddata->running = true;
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} else {
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if (!ddata->running)
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return;
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sec_vib_vdd_en(&ddata->dev, LDO_DIS);
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ddata->running = false;
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}
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return;
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}
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#if defined(CONFIG_OF)
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static struct sec_vib_pdata *sec_vib_get_dt(struct device *dev)
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{
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struct device_node *node, *child_node;
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struct sec_vib_pdata *pdata;
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int ret = 0;
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node = dev->of_node;
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if (!node) {
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ret = -ENODEV;
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goto err_out;
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}
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child_node = of_get_next_child(node, NULL);
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if (!child_node) {
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printk("[VIB] failed to get dt node\n");
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ret = -EINVAL;
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goto err_out;
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}
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pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
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if (!pdata) {
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printk("[VIB] failed to alloc\n");
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ret = -ENOMEM;
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goto err_out;
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}
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of_property_read_u32(child_node, "sec_vib,max_timeout", &pdata->max_timeout);
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of_property_read_u32(child_node, "sec_vib,ldo_type", &pdata->ldo_type);
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if (pdata->ldo_type == INTERNAL_LDO) {
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of_property_read_string(child_node, "sec_vib,regulator", &pdata->regulator);
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}
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else if (pdata->ldo_type == EXTERNAL_LDO) {
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pdata->gpio_ldo_en = of_get_named_gpio(child_node, "sec_vib,ldo_en", 0);
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if (!gpio_is_valid(pdata->gpio_ldo_en)) {
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printk("[VIB]failed to get ldo_en gpio\n");
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} else {
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ret = gpio_request(pdata->gpio_ldo_en, "mot_ldo_en");
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if (ret) {
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printk("[VIB]: %s : motor gpio request fail = %d \n",__func__, ret);
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goto err_gpio_req;
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}
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ret = gpio_direction_output(pdata->gpio_ldo_en, 0);
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}
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}
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return pdata;
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err_gpio_req:
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kfree(pdata);
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err_out:
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return ERR_PTR(ret);
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}
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#endif
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static int sec_vib_probe(struct platform_device *pdev)
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{
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struct sec_vib_pdata *pdata = pdev->dev.platform_data;
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struct sec_vib_drvdata *ddata;
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int ret = 0;
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pr_info("[VIB] %s \n", __func__);
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if (!pdata) {
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#if defined(CONFIG_OF)
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pdata = sec_vib_get_dt(&pdev->dev);
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if (IS_ERR(pdata)) {
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printk(KERN_ERR "[VIB] there is no device tree!\n");
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ret = -ENODEV;
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goto err_pdata;
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}
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#else
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ret = -ENODEV;
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printk(KERN_ERR "[VIB] there is no platform data!\n");
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goto err_pdata;
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#endif
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}
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ddata = kzalloc(sizeof(struct sec_vib_drvdata), GFP_KERNEL);
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if (!ddata) {
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ret = -ENOMEM;
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printk(KERN_ERR "[VIB] Failed to memory alloc \n");
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goto err_ddata;
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}
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ddata->ldo_type = pdata->ldo_type;
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if (ddata->ldo_type == INTERNAL_LDO) {
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ddata->regulator = regulator_get(NULL, pdata->regulator);
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if (IS_ERR(ddata->regulator)) {
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printk(KERN_ERR "[VIB] failed get %s\n", pdata->regulator);
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ret = PTR_ERR(ddata->regulator);
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goto err_regulator_get;
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}
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}
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else if (ddata->ldo_type == EXTERNAL_LDO) {
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ddata->gpio_ldo_en = pdata->gpio_ldo_en;
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}
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hrtimer_init(&ddata->timer, CLOCK_MONOTONIC,
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HRTIMER_MODE_REL);
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ddata->timer.function = sec_vib_timer_func;
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spin_lock_init(&ddata->lock);
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ddata->max_timeout = pdata->max_timeout;
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ddata->workqueue = create_singlethread_workqueue("sec_vib_work");
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if (!ddata->workqueue) {
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ret = -EFAULT;
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printk(KERN_ERR "[VIB] Failed to create workqueue \n");
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goto err_work_queue;
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}
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INIT_WORK(&(ddata->work), sec_vib_work);
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ddata->dev.name = "vibrator";
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ddata->dev.get_time = sec_vib_get_time;
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ddata->dev.enable = sec_vib_enable;
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ret = timed_output_dev_register(&ddata->dev);
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if (ret < 0)
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goto err_timed_output_register;
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platform_set_drvdata(pdev, ddata);
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return 0;
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err_timed_output_register:
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destroy_workqueue(ddata->workqueue);
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err_work_queue:
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if (ddata->ldo_type == INTERNAL_LDO) { /* pmic ldo */
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regulator_put(ddata->regulator);
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}
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err_regulator_get:
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kfree(ddata);
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err_ddata:
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#if defined(CONFIG_OF)
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kfree(pdata);
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#endif
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err_pdata:
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return ret;
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}
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static int sec_vib_remove(struct platform_device *pdev)
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{
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struct sec_vib_drvdata *ddata = platform_get_drvdata(pdev);
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destroy_workqueue(ddata->workqueue);
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if (ddata->ldo_type == INTERNAL_LDO) { /* pmic ldo */
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regulator_put(ddata->regulator);
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}
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timed_output_dev_unregister(&ddata->dev);
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kfree(ddata);
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return 0;
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}
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#if defined(CONFIG_OF)
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static struct of_device_id sec_vib_dt_ids[] = {
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{ .compatible = "sec_vib" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, sec_vib_dt_ids);
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#endif /* CONFIG_OF */
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static struct platform_driver sec_vib_driver = {
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.probe = sec_vib_probe,
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.remove = sec_vib_remove,
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.driver = {
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.name = SEC_VIB_NAME,
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.owner = THIS_MODULE,
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.of_match_table = of_match_ptr(sec_vib_dt_ids),
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},
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};
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static int __init sec_vib_init(void)
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{
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return platform_driver_register(&sec_vib_driver);
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}
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module_init(sec_vib_init);
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static void __exit sec_vib_exit(void)
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{
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platform_driver_unregister(&sec_vib_driver);
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}
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module_exit(sec_vib_exit);
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MODULE_AUTHOR("Samsung Electronics");
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MODULE_DESCRIPTION("dc motor driver");
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MODULE_LICENSE("GPL");
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