tas2563-misc.c

   1 /*
   2 ** =============================================================================
   3 ** Copyright (c) 2016  Texas Instruments Inc.
   4 **
   5 ** This program is free software; you can redistribute it and/or modify it under
   6 ** the terms of the GNU General Public License as published by the Free Software
   7 ** Foundation; version 2.
   8 **
   9 ** This program is distributed in the hope that it will be useful, but WITHOUT
  10 ** ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  11 ** FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
  12 **
  13 ** File:
  14 **     tas2563-misc.c
  15 **
  16 ** Description:
  17 **     misc driver for Texas Instruments TAS2563 High Performance 4W Smart Amplifier
  18 **
  19 ** =============================================================================
  20 */
  21
  22 #ifdef CONFIG_TAS2563_MISC
  23
  24 #define DEBUG
  25 #include <linux/module.h>
  26 #include <linux/moduleparam.h>
  27 #include <linux/init.h>
  28 #include <linux/delay.h>
  29 #include <linux/pm.h>
  30 #include <linux/i2c.h>
  31 #include <linux/gpio.h>
  32 #include <linux/regulator/consumer.h>
  33 #include <linux/firmware.h>
  34 #include <linux/regmap.h>
  35 #include <linux/of.h>
  36 #include <linux/of_gpio.h>
  37 #include <linux/slab.h>
  38 #include <linux/syscalls.h>
  39 #include <linux/fcntl.h>
  40 #include <linux/miscdevice.h>
  41 #include <linux/uaccess.h>
  42
  43 #include "tas2563.h"
  44 #include "tas2563-misc.h"
  45 #include <linux/dma-mapping.h>
  46
  47 static int g_logEnable = 1;
  48 static struct tas2563_priv *g_tas2563;
  49
  50 static int tas2563_file_open(struct inode *inode, struct file *file)
  51 {
  52         struct tas2563_priv *pTAS2563 = g_tas2563;
  53
  54         if (!try_module_get(THIS_MODULE))
  55                 return -ENODEV;
  56
  57         file->private_data = (void *)pTAS2563;
  58         if (g_logEnable)
  59                 dev_info(pTAS2563->dev, "%s\n", __func__);
  60         return 0;
  61 }
  62
  63 static int tas2563_file_release(struct inode *inode, struct file *file)
  64 {
  65         struct tas2563_priv *pTAS2563 = (struct tas2563_priv *)file->private_data;
  66
  67         if (g_logEnable)
  68                 dev_info(pTAS2563->dev, "%s\n", __func__);
  69         file->private_data = (void *)NULL;
  70         module_put(THIS_MODULE);
  71
  72         return 0;
  73 }
  74
  75 static ssize_t tas2563_file_read(struct file *file, char *buf, size_t count, loff_t *ppos)
  76 {
  77         struct tas2563_priv *pTAS2563 = (struct tas2563_priv *)file->private_data;
  78         int ret = 0;
  79         unsigned int nValue = 0;
  80         unsigned char value = 0;
  81         unsigned char *p_kBuf = NULL;
  82
  83         mutex_lock(&pTAS2563->file_lock);
  84
  85         switch (pTAS2563->mnDBGCmd) {
  86         case TIAUDIO_CMD_REG_READ: {
  87                 if (g_logEnable)
  88                         dev_info(pTAS2563->dev, "TIAUDIO_CMD_REG_READ: current_reg = 0x%x, count=%d\n",
  89                                 pTAS2563->mnCurrentReg, (int)count);
  90                 if (count == 1) {
  91                         ret = pTAS2563->read(pTAS2563, pTAS2563->mnCurrentReg, &nValue);
  92                         if (ret < 0)
  93                                 break;
  94
  95                         value = (u8)nValue;
  96                         if (g_logEnable)
  97                                 dev_info(pTAS2563->dev, "TIAUDIO_CMD_REG_READ: nValue=0x%x, value=0x%x\n", nValue, value);
  98                         ret = copy_to_user(buf, &value, 1);
  99                         if (ret != 0) {
 100                                 /* Failed to copy all the data, exit */
 101                                 dev_err(pTAS2563->dev, "copy to user fail %d\n", ret);
 102                         }
 103                 } else if (count > 1) {
 104                         p_kBuf = kzalloc(count, GFP_KERNEL);
 105                         if (p_kBuf != NULL) {
 106                                 ret = pTAS2563->bulk_read(pTAS2563, pTAS2563->mnCurrentReg, p_kBuf, count);
 107                                 if (ret < 0)
 108                                         break;
 109                                 ret = copy_to_user(buf, p_kBuf, count);
 110                                 if (ret != 0) {
 111                                         /* Failed to copy all the data, exit */
 112                                         dev_err(pTAS2563->dev, "copy to user fail %d\n", ret);
 113                                 }
 114                                 kfree(p_kBuf);
 115                         } else
 116                                 dev_err(pTAS2563->dev, "read no mem\n");
 117                 }
 118         }
 119         break;
 120
 121         }
 122         pTAS2563->mnDBGCmd = 0;
 123
 124         mutex_unlock(&pTAS2563->file_lock);
 125         return count;
 126 }
 127
 128 static ssize_t tas2563_file_write(struct file *file, const char *buf, size_t count, loff_t *ppos)
 129 {
 130         struct tas2563_priv *pTAS2563 = (struct tas2563_priv *)file->private_data;
 131         int ret = 0;
 132         unsigned char *p_kBuf = NULL;
 133         unsigned int reg = 0;
 134         unsigned int len = 0;
 135
 136         mutex_lock(&pTAS2563->file_lock);
 137
 138         p_kBuf = kzalloc(count, GFP_KERNEL);
 139         if (p_kBuf == NULL) {
 140                 dev_err(pTAS2563->dev, "write no mem\n");
 141                 goto err;
 142         }
 143
 144         ret = copy_from_user(p_kBuf, buf, count);
 145         if (ret != 0) {
 146                 dev_err(pTAS2563->dev, "copy_from_user failed.\n");
 147                 goto err;
 148         }
 149
 150         pTAS2563->mnDBGCmd = p_kBuf[0];
 151         switch (pTAS2563->mnDBGCmd) {
 152         case TIAUDIO_CMD_REG_WITE:
 153                 if (count > 5) {
 154                         reg = ((unsigned int)p_kBuf[1] << 24)
 155                                 + ((unsigned int)p_kBuf[2] << 16)
 156                                 + ((unsigned int)p_kBuf[3] << 8)
 157                                 + (unsigned int)p_kBuf[4];
 158                         len = count - 5;
 159                         if (len == 1) {
 160                                 ret = pTAS2563->write(pTAS2563, reg, p_kBuf[5]);
 161                                 if (g_logEnable)
 162                                         dev_info(pTAS2563->dev, "TIAUDIO_CMD_REG_WITE, Reg=0x%x, Val=0x%x\n", reg, p_kBuf[5]);
 163                         } else
 164                                 ret = pTAS2563->bulk_write(pTAS2563, reg, &p_kBuf[5], len);
 165                 } else
 166                         dev_err(pTAS2563->dev, "%s, write len fail, count=%d.\n", __func__, (int)count);
 167                 pTAS2563->mnDBGCmd = 0;
 168         break;
 169
 170         case TIAUDIO_CMD_REG_READ:
 171                 if (count == 5) {
 172                         pTAS2563->mnCurrentReg = ((unsigned int)p_kBuf[1] << 24)
 173                                 + ((unsigned int)p_kBuf[2] << 16)
 174                                 + ((unsigned int)p_kBuf[3] << 8)
 175                                 + (unsigned int)p_kBuf[4];
 176                         if (g_logEnable)
 177                                 dev_info(pTAS2563->dev, "TIAUDIO_CMD_REG_READ whole=0x%x\n", pTAS2563->mnCurrentReg);
 178                 } else
 179                         dev_err(pTAS2563->dev, "read len fail.\n");
 180         break;
 181         }
 182
 183 err:
 184         if (p_kBuf != NULL)
 185                 kfree(p_kBuf);
 186
 187         mutex_unlock(&pTAS2563->file_lock);
 188
 189         return count;
 190 }
 191
 192 static const struct file_operations fops = {
 193         .owner = THIS_MODULE,
 194         .read = tas2563_file_read,
 195         .write = tas2563_file_write,
 196         .unlocked_ioctl = NULL,
 197         .open = tas2563_file_open,
 198         .release = tas2563_file_release,
 199 };
 200
 201 #define MODULE_NAME     "tas2563"
 202 static struct miscdevice tas2563_misc = {
 203         .minor = MISC_DYNAMIC_MINOR,
 204         .name = MODULE_NAME,
 205         .fops = &fops,
 206 };
 207
 208 int tas2563_register_misc(struct tas2563_priv *pTAS2563)
 209 {
 210         int ret = 0;
 211
 212         g_tas2563 = pTAS2563;
 213
 214         ret = misc_register(&tas2563_misc);
 215         if (ret)
 216                 dev_err(pTAS2563->dev, "TAS2563 misc fail: %d\n", ret);
 217
 218         dev_info(pTAS2563->dev, "%s, leave\n", __func__);
 219
 220         return ret;
 221 }
 222
 223 int tas2563_deregister_misc(struct tas2563_priv *pTAS2563)
 224 {
 225         misc_deregister(&tas2563_misc);
 226         return 0;
 227 }
 228
 229 MODULE_AUTHOR("Texas Instruments Inc.");
 230 MODULE_DESCRIPTION("TAS2563 Misc Smart Amplifier driver");
 231 MODULE_LICENSE("GPL v2");
 232 #endif