260 lines
6.2 KiB
C
260 lines
6.2 KiB
C
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/*
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* =============================================================================
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* Copyright (c) 2016 Texas Instruments Inc.
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*
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* This program is free software; you can redistribute it and/or modify it under
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* the terms of the GNU General Public License as published by the Free Software
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* Foundation; version 2.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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* File:
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* tas2562-misc.c
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*
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* Description:
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* misc driver for Texas Instruments
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* TAS2562 High Performance 4W Smart Amplifier
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*
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* =============================================================================
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*/
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#define DEBUG
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/pm.h>
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#include <linux/i2c.h>
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#include <linux/gpio.h>
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#include <linux/regulator/consumer.h>
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#include <linux/firmware.h>
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#include <linux/regmap.h>
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#include <linux/of.h>
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#include <linux/of_gpio.h>
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#include <linux/slab.h>
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#include <linux/syscalls.h>
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#include <linux/fcntl.h>
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#include <linux/miscdevice.h>
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#include <linux/uaccess.h>
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#include "tas2562.h"
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#include "tas2562-misc.h"
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#include <linux/dma-mapping.h>
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static int g_log_enable = 1;
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static struct tas2562_priv *g_tas2562;
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static int tas2562_file_open(struct inode *inode, struct file *file)
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{
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struct tas2562_priv *p_tas2562 = g_tas2562;
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if (!try_module_get(THIS_MODULE))
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return -ENODEV;
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file->private_data = (void *)p_tas2562;
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if (g_log_enable)
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dev_info(p_tas2562->dev, "%s\n", __func__);
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return 0;
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}
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static int tas2562_file_release(struct inode *inode, struct file *file)
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{
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struct tas2562_priv *p_tas2562 =
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(struct tas2562_priv *)file->private_data;
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if (g_log_enable)
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dev_info(p_tas2562->dev, "%s\n", __func__);
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file->private_data = (void *)NULL;
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module_put(THIS_MODULE);
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return 0;
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}
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static ssize_t tas2562_file_read(struct file *file,
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char *buf, size_t count, loff_t *ppos)
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{
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struct tas2562_priv *p_tas2562 =
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(struct tas2562_priv *)file->private_data;
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int ret = 0;
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unsigned int n_value = 0;
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unsigned char value = 0;
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unsigned char *p_kbuf = NULL;
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mutex_lock(&p_tas2562->file_lock);
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switch (p_tas2562->mn_dbg_cmd) {
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case TIAUDIO_CMD_REG_READ:
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{
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if (g_log_enable)
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dev_info(p_tas2562->dev,
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"TIAUDIO_CMD_REG_READ: current_reg = 0x%x, count=%d\n",
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p_tas2562->mn_current_reg, (int)count);
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if (count == 1) {
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ret = p_tas2562->read(p_tas2562,
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p_tas2562->mn_current_reg, &n_value);
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if (ret < 0) {
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dev_err(p_tas2562->dev,
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"dev read fail %d\n", ret);
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break;
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}
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value = (u8)n_value;
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if (g_log_enable)
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dev_info(p_tas2562->dev, "TIAUDIO_CMD_REG_READ: n_value=0x%x, value=0x%x\n",
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n_value, value);
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ret = copy_to_user(buf, &value, 1);
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if (ret != 0) {
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/* Failed to copy all the data, exit */
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dev_err(p_tas2562->dev,
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"copy to user fail %d\n", ret);
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}
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} else if (count > 1) {
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p_kbuf = kzalloc(count, GFP_KERNEL);
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if (p_kbuf != NULL) {
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ret = p_tas2562->bulk_read(p_tas2562,
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p_tas2562->mn_current_reg, p_kbuf, count);
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if (ret < 0) {
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dev_err(p_tas2562->dev,
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"dev bulk read fail %d\n", ret);
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} else {
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ret = copy_to_user(buf, p_kbuf, count);
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if (ret != 0) {
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/* Failed to copy all the data, exit */
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dev_err(p_tas2562->dev,
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"copy to user fail %d\n", ret);
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}
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}
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kfree(p_kbuf);
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} else {
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dev_err(p_tas2562->dev, "read no mem\n");
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}
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}
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}
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break;
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}
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p_tas2562->mn_dbg_cmd = 0;
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mutex_unlock(&p_tas2562->file_lock);
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return count;
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}
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static ssize_t tas2562_file_write(struct file *file,
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const char *buf, size_t count, loff_t *ppos)
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{
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struct tas2562_priv *p_tas2562 =
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(struct tas2562_priv *)file->private_data;
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int ret = 0;
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unsigned char *p_kbuf = NULL;
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unsigned int reg = 0;
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unsigned int len = 0;
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mutex_lock(&p_tas2562->file_lock);
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p_kbuf = kzalloc(count, GFP_KERNEL);
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if (p_kbuf == NULL) {
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/* dev_err(p_tas2562->dev, "write no mem\n"); */
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goto err;
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}
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ret = copy_from_user(p_kbuf, buf, count);
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if (ret != 0) {
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dev_err(p_tas2562->dev, "copy_from_user failed.\n");
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goto err;
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}
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p_tas2562->mn_dbg_cmd = p_kbuf[0];
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switch (p_tas2562->mn_dbg_cmd) {
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case TIAUDIO_CMD_REG_WITE:
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if (count > 5) {
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reg = ((unsigned int)p_kbuf[1] << 24) +
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((unsigned int)p_kbuf[2] << 16) +
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((unsigned int)p_kbuf[3] << 8) +
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(unsigned int)p_kbuf[4];
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len = count - 5;
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if (len == 1) {
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ret = p_tas2562->write(p_tas2562, reg, p_kbuf[5]);
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if (g_log_enable)
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dev_info(p_tas2562->dev,
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"TIAUDIO_CMD_REG_WITE, Reg=0x%x, Val=0x%x\n",
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reg, p_kbuf[5]);
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} else {
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ret = p_tas2562->bulk_write(p_tas2562,
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reg, &p_kbuf[5], len);
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}
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} else {
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dev_err(p_tas2562->dev, "%s, write len fail, count=%d.\n",
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__func__, (int)count);
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}
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p_tas2562->mn_dbg_cmd = 0;
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break;
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case TIAUDIO_CMD_REG_READ:
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if (count == 5) {
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p_tas2562->mn_current_reg = ((unsigned int)p_kbuf[1] << 24) +
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((unsigned int)p_kbuf[2] << 16) +
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((unsigned int)p_kbuf[3] << 8) +
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(unsigned int)p_kbuf[4];
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if (g_log_enable) {
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dev_info(p_tas2562->dev,
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"TIAUDIO_CMD_REG_READ, whole=0x%x\n",
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p_tas2562->mn_current_reg);
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}
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} else {
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dev_err(p_tas2562->dev, "read len fail.\n");
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}
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break;
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}
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err:
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if (p_kbuf != NULL)
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kfree(p_kbuf);
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mutex_unlock(&p_tas2562->file_lock);
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return count;
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}
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static const struct file_operations fops = {
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.owner = THIS_MODULE,
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.read = tas2562_file_read,
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.write = tas2562_file_write,
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.unlocked_ioctl = NULL,
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.open = tas2562_file_open,
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.release = tas2562_file_release,
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};
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#define MODULE_NAME "tas2562"
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static struct miscdevice tas2562_misc = {
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.minor = MISC_DYNAMIC_MINOR,
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.name = MODULE_NAME,
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.fops = &fops,
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};
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int tas2562_register_misc(struct tas2562_priv *p_tas2562)
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{
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int ret = 0;
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g_tas2562 = p_tas2562;
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ret = misc_register(&tas2562_misc);
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if (ret)
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dev_err(p_tas2562->dev, "TAS2562 misc fail: %d\n", ret);
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dev_info(p_tas2562->dev, "%s, leave\n", __func__);
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return ret;
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}
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int tas2562_deregister_misc(struct tas2562_priv *p_tas2562)
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{
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misc_deregister(&tas2562_misc);
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return 0;
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}
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MODULE_AUTHOR("Texas Instruments Inc.");
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MODULE_DESCRIPTION("TAS2562 Misc Smart Amplifier driver");
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MODULE_LICENSE("GPL v2");
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