drivers/soundwire/debugfs.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 // Copyright(c) 2017-2019 Intel Corporation.
   3
   4 #include <linux/device.h>
   5 #include <linux/debugfs.h>
   6 #include <linux/mod_devicetable.h>
   7 #include <linux/slab.h>
   8 #include <linux/soundwire/sdw.h>
   9 #include <linux/soundwire/sdw_registers.h>
  10 #include "bus.h"
  11
  12 static struct dentry *sdw_debugfs_root;
  13
  14 void sdw_bus_debugfs_init(struct sdw_bus *bus)
  15 {
  16         char name[16];
  17
  18         if (!sdw_debugfs_root)
  19                 return;
  20
  21         /* create the debugfs master-N */
  22         snprintf(name, sizeof(name), "master-%d", bus->link_id);
  23         bus->debugfs = debugfs_create_dir(name, sdw_debugfs_root);
  24 }
  25
  26 void sdw_bus_debugfs_exit(struct sdw_bus *bus)
  27 {
  28         debugfs_remove_recursive(bus->debugfs);
  29 }
  30
  31 #define RD_BUF (3 * PAGE_SIZE)
  32
  33 static ssize_t sdw_sprintf(struct sdw_slave *slave,
  34                            char *buf, size_t pos, unsigned int reg)
  35 {
  36         int value;
  37
  38         value = sdw_read(slave, reg);
  39
  40         if (value < 0)
  41                 return scnprintf(buf + pos, RD_BUF - pos, "%3x\tXX\n", reg);
  42         else
  43                 return scnprintf(buf + pos, RD_BUF - pos,
  44                                 "%3x\t%2x\n", reg, value);
  45 }
  46
  47 static int sdw_slave_reg_show(struct seq_file *s_file, void *data)
  48 {
  49         struct sdw_slave *slave = s_file->private;
  50         char *buf;
  51         ssize_t ret;
  52         int i, j;
  53
  54         buf = kzalloc(RD_BUF, GFP_KERNEL);
  55         if (!buf)
  56                 return -ENOMEM;
  57
  58         ret = scnprintf(buf, RD_BUF, "Register  Value\n");
  59
  60         /* DP0 non-banked registers */
  61         ret += scnprintf(buf + ret, RD_BUF - ret, "\nDP0\n");
  62         for (i = SDW_DP0_INT; i <= SDW_DP0_PREPARECTRL; i++)
  63                 ret += sdw_sprintf(slave, buf, ret, i);
  64
  65         /* DP0 Bank 0 registers */
  66         ret += scnprintf(buf + ret, RD_BUF - ret, "Bank0\n");
  67         ret += sdw_sprintf(slave, buf, ret, SDW_DP0_CHANNELEN);
  68         for (i = SDW_DP0_SAMPLECTRL1; i <= SDW_DP0_LANECTRL; i++)
  69                 ret += sdw_sprintf(slave, buf, ret, i);
  70
  71         /* DP0 Bank 1 registers */
  72         ret += scnprintf(buf + ret, RD_BUF - ret, "Bank1\n");
  73         ret += sdw_sprintf(slave, buf, ret,
  74                         SDW_DP0_CHANNELEN + SDW_BANK1_OFFSET);
  75         for (i = SDW_DP0_SAMPLECTRL1 + SDW_BANK1_OFFSET;
  76                         i <= SDW_DP0_LANECTRL + SDW_BANK1_OFFSET; i++)
  77                 ret += sdw_sprintf(slave, buf, ret, i);
  78
  79         /* SCP registers */
  80         ret += scnprintf(buf + ret, RD_BUF - ret, "\nSCP\n");
  81         for (i = SDW_SCP_INT1; i <= SDW_SCP_BANKDELAY; i++)
  82                 ret += sdw_sprintf(slave, buf, ret, i);
  83         for (i = SDW_SCP_DEVID_0; i <= SDW_SCP_DEVID_5; i++)
  84                 ret += sdw_sprintf(slave, buf, ret, i);
  85
  86         /*
  87          * SCP Bank 0/1 registers are read-only and cannot be
  88          * retrieved from the Slave. The Master typically keeps track
  89          * of the current frame size so the information can be found
  90          * in other places
  91          */
  92
  93         /* DP1..14 registers */
  94         for (i = 1; SDW_VALID_PORT_RANGE(i); i++) {
  95
  96                 /* DPi registers */
  97                 ret += scnprintf(buf + ret, RD_BUF - ret, "\nDP%d\n", i);
  98                 for (j = SDW_DPN_INT(i); j <= SDW_DPN_PREPARECTRL(i); j++)
  99                         ret += sdw_sprintf(slave, buf, ret, j);
 100
 101                 /* DPi Bank0 registers */
 102                 ret += scnprintf(buf + ret, RD_BUF - ret, "Bank0\n");
 103                 for (j = SDW_DPN_CHANNELEN_B0(i);
 104                      j <= SDW_DPN_LANECTRL_B0(i); j++)
 105                         ret += sdw_sprintf(slave, buf, ret, j);
 106
 107                 /* DPi Bank1 registers */
 108                 ret += scnprintf(buf + ret, RD_BUF - ret, "Bank1\n");
 109                 for (j = SDW_DPN_CHANNELEN_B1(i);
 110                      j <= SDW_DPN_LANECTRL_B1(i); j++)
 111                         ret += sdw_sprintf(slave, buf, ret, j);
 112         }
 113
 114         seq_printf(s_file, "%s", buf);
 115         kfree(buf);
 116
 117         return 0;
 118 }
 119 DEFINE_SHOW_ATTRIBUTE(sdw_slave_reg);
 120
 121 void sdw_slave_debugfs_init(struct sdw_slave *slave)
 122 {
 123         struct dentry *master;
 124         struct dentry *d;
 125         char name[32];
 126
 127         master = slave->bus->debugfs;
 128
 129         /* create the debugfs slave-name */
 130         snprintf(name, sizeof(name), "%s", dev_name(&slave->dev));
 131         d = debugfs_create_dir(name, master);
 132
 133         debugfs_create_file("registers", 0400, d, slave, &sdw_slave_reg_fops);
 134
 135         slave->debugfs = d;
 136 }
 137
 138 void sdw_slave_debugfs_exit(struct sdw_slave *slave)
 139 {
 140         debugfs_remove_recursive(slave->debugfs);
 141 }
 142
 143 void sdw_debugfs_init(void)
 144 {
 145         sdw_debugfs_root = debugfs_create_dir("soundwire", NULL);
 146 }
 147
 148 void sdw_debugfs_exit(void)
 149 {
 150         debugfs_remove_recursive(sdw_debugfs_root);
 151 }