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/pm_runtime.h> 8 #include <linux/slab.h> 9 #include <linux/soundwire/sdw.h> 10 #include <linux/soundwire/sdw_registers.h> 11 #include "bus.h" 12 13 static struct dentry *sdw_debugfs_root; 14 15 void sdw_bus_debugfs_init(struct sdw_bus *bus) 16 { 17 char name[16]; 18 19 if (!sdw_debugfs_root) 20 return; 21 22 /* create the debugfs master-N */ 23 snprintf(name, sizeof(name), "master-%d-%d", bus->id, bus->link_id); 24 bus->debugfs = debugfs_create_dir(name, sdw_debugfs_root); 25 } 26 27 void sdw_bus_debugfs_exit(struct sdw_bus *bus) 28 { 29 debugfs_remove_recursive(bus->debugfs); 30 } 31 32 #define RD_BUF (3 * PAGE_SIZE) 33 34 static ssize_t sdw_sprintf(struct sdw_slave *slave, 35 char *buf, size_t pos, unsigned int reg) 36 { 37 int value; 38 39 value = sdw_read_no_pm(slave, reg); 40 41 if (value < 0) 42 return scnprintf(buf + pos, RD_BUF - pos, "%3x\tXX\n", reg); 43 else 44 return scnprintf(buf + pos, RD_BUF - pos, 45 "%3x\t%2x\n", reg, value); 46 } 47 48 static int sdw_slave_reg_show(struct seq_file *s_file, void *data) 49 { 50 struct sdw_slave *slave = s_file->private; 51 char *buf; 52 ssize_t ret; 53 int i, j; 54 55 buf = kzalloc(RD_BUF, GFP_KERNEL); 56 if (!buf) 57 return -ENOMEM; 58 59 ret = pm_runtime_resume_and_get(&slave->dev); 60 if (ret < 0 && ret != -EACCES) { 61 kfree(buf); 62 return ret; 63 } 64 65 ret = scnprintf(buf, RD_BUF, "Register Value\n"); 66 67 /* DP0 non-banked registers */ 68 ret += scnprintf(buf + ret, RD_BUF - ret, "\nDP0\n"); 69 for (i = SDW_DP0_INT; i <= SDW_DP0_PREPARECTRL; i++) 70 ret += sdw_sprintf(slave, buf, ret, i); 71 72 /* DP0 Bank 0 registers */ 73 ret += scnprintf(buf + ret, RD_BUF - ret, "Bank0\n"); 74 ret += sdw_sprintf(slave, buf, ret, SDW_DP0_CHANNELEN); 75 for (i = SDW_DP0_SAMPLECTRL1; i <= SDW_DP0_LANECTRL; i++) 76 ret += sdw_sprintf(slave, buf, ret, i); 77 78 /* DP0 Bank 1 registers */ 79 ret += scnprintf(buf + ret, RD_BUF - ret, "Bank1\n"); 80 ret += sdw_sprintf(slave, buf, ret, 81 SDW_DP0_CHANNELEN + SDW_BANK1_OFFSET); 82 for (i = SDW_DP0_SAMPLECTRL1 + SDW_BANK1_OFFSET; 83 i <= SDW_DP0_LANECTRL + SDW_BANK1_OFFSET; i++) 84 ret += sdw_sprintf(slave, buf, ret, i); 85 86 /* SCP registers */ 87 ret += scnprintf(buf + ret, RD_BUF - ret, "\nSCP\n"); 88 for (i = SDW_SCP_INT1; i <= SDW_SCP_BANKDELAY; i++) 89 ret += sdw_sprintf(slave, buf, ret, i); 90 for (i = SDW_SCP_DEVID_0; i <= SDW_SCP_DEVID_5; i++) 91 ret += sdw_sprintf(slave, buf, ret, i); 92 93 /* 94 * SCP Bank 0/1 registers are read-only and cannot be 95 * retrieved from the Slave. The Master typically keeps track 96 * of the current frame size so the information can be found 97 * in other places 98 */ 99 100 /* DP1..14 registers */ 101 for (i = 1; SDW_VALID_PORT_RANGE(i); i++) { 102 103 /* DPi registers */ 104 ret += scnprintf(buf + ret, RD_BUF - ret, "\nDP%d\n", i); 105 for (j = SDW_DPN_INT(i); j <= SDW_DPN_PREPARECTRL(i); j++) 106 ret += sdw_sprintf(slave, buf, ret, j); 107 108 /* DPi Bank0 registers */ 109 ret += scnprintf(buf + ret, RD_BUF - ret, "Bank0\n"); 110 for (j = SDW_DPN_CHANNELEN_B0(i); 111 j <= SDW_DPN_LANECTRL_B0(i); j++) 112 ret += sdw_sprintf(slave, buf, ret, j); 113 114 /* DPi Bank1 registers */ 115 ret += scnprintf(buf + ret, RD_BUF - ret, "Bank1\n"); 116 for (j = SDW_DPN_CHANNELEN_B1(i); 117 j <= SDW_DPN_LANECTRL_B1(i); j++) 118 ret += sdw_sprintf(slave, buf, ret, j); 119 } 120 121 seq_printf(s_file, "%s", buf); 122 123 pm_runtime_mark_last_busy(&slave->dev); 124 pm_runtime_put(&slave->dev); 125 126 kfree(buf); 127 128 return 0; 129 } 130 DEFINE_SHOW_ATTRIBUTE(sdw_slave_reg); 131 132 void sdw_slave_debugfs_init(struct sdw_slave *slave) 133 { 134 struct dentry *master; 135 struct dentry *d; 136 char name[32]; 137 138 master = slave->bus->debugfs; 139 140 /* create the debugfs slave-name */ 141 snprintf(name, sizeof(name), "%s", dev_name(&slave->dev)); 142 d = debugfs_create_dir(name, master); 143 144 debugfs_create_file("registers", 0400, d, slave, &sdw_slave_reg_fops); 145 146 slave->debugfs = d; 147 } 148 149 void sdw_slave_debugfs_exit(struct sdw_slave *slave) 150 { 151 debugfs_remove_recursive(slave->debugfs); 152 } 153 154 void sdw_debugfs_init(void) 155 { 156 sdw_debugfs_root = debugfs_create_dir("soundwire", NULL); 157 } 158 159 void sdw_debugfs_exit(void) 160 { 161 debugfs_remove_recursive(sdw_debugfs_root); 162 } 163