Prakash Dhavali | 7090c5f | 2015-11-02 17:55:19 -0800 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (c) 2013-2014 The Linux Foundation. All rights reserved. |
| 3 | * |
| 4 | * Previously licensed under the ISC license by Qualcomm Atheros, Inc. |
| 5 | * |
| 6 | * |
| 7 | * Permission to use, copy, modify, and/or distribute this software for |
| 8 | * any purpose with or without fee is hereby granted, provided that the |
| 9 | * above copyright notice and this permission notice appear in all |
| 10 | * copies. |
| 11 | * |
| 12 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL |
| 13 | * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED |
| 14 | * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE |
| 15 | * AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL |
| 16 | * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR |
| 17 | * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER |
| 18 | * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR |
| 19 | * PERFORMANCE OF THIS SOFTWARE. |
| 20 | */ |
| 21 | |
| 22 | /* |
| 23 | * This file was originally distributed by Qualcomm Atheros, Inc. |
| 24 | * under proprietary terms before Copyright ownership was assigned |
| 25 | * to the Linux Foundation. |
| 26 | */ |
| 27 | |
| 28 | #if defined(CONFIG_ATH_PROCFS_DIAG_SUPPORT) |
| 29 | #include <linux/module.h> /* Specifically, a module */ |
| 30 | #include <linux/kernel.h> /* We're doing kernel work */ |
| 31 | #include <linux/version.h> /* We're doing kernel work */ |
| 32 | #include <linux/proc_fs.h> /* Necessary because we use the proc fs */ |
| 33 | #include <asm/uaccess.h> /* for copy_from_user */ |
| 34 | #include "ol_if_athvar.h" |
| 35 | #include "hif.h" |
| 36 | #if defined(HIF_PCI) |
| 37 | #include "if_pci.h" |
| 38 | #elif defined(HIF_USB) |
| 39 | #include "if_usb.h" |
| 40 | #elif defined(HIF_SDIO) |
| 41 | #include "if_ath_sdio.h" |
| 42 | #endif |
| 43 | #include "cds_api.h" |
| 44 | #include "hif_debug.h" |
| 45 | |
| 46 | #define PROCFS_NAME "athdiagpfs" |
| 47 | #define PROCFS_DIR "cld" |
| 48 | |
| 49 | /** |
| 50 | * This structure hold information about the /proc file |
| 51 | * |
| 52 | */ |
| 53 | static struct proc_dir_entry *proc_file, *proc_dir; |
| 54 | |
| 55 | static void *get_hif_hdl_from_file(struct file *file) |
| 56 | { |
| 57 | struct ol_softc *scn; |
| 58 | |
| 59 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 10, 0)) |
| 60 | scn = (struct ol_softc *)PDE_DATA(file_inode(file)); |
| 61 | #else |
| 62 | scn = (struct ol_softc *)( |
| 63 | PDE(file->f_path.dentry->d_inode)->data); |
| 64 | #endif |
| 65 | return (void *)scn; |
| 66 | } |
| 67 | |
| 68 | static ssize_t ath_procfs_diag_read(struct file *file, char __user *buf, |
| 69 | size_t count, loff_t *pos) |
| 70 | { |
| 71 | hif_handle_t hif_hdl; |
| 72 | int rv; |
| 73 | uint8_t *read_buffer = NULL; |
| 74 | |
| 75 | read_buffer = cdf_mem_malloc(count); |
| 76 | if (NULL == read_buffer) { |
| 77 | HIF_ERROR("%s: cdf_mem_alloc failed", __func__); |
| 78 | return -ENOMEM; |
| 79 | } |
| 80 | |
| 81 | hif_hdl = get_hif_hdl_from_file(file); |
| 82 | HIF_DBG("rd buff 0x%p cnt %zu offset 0x%x buf 0x%p", |
| 83 | read_buffer, count, (int)*pos, buf); |
| 84 | |
| 85 | if ((count == 4) && ((((uint32_t) (*pos)) & 3) == 0)) { |
| 86 | /* reading a word? */ |
| 87 | rv = hif_diag_read_access(hif_hdl, (uint32_t)(*pos), |
| 88 | (uint32_t *)read_buffer); |
| 89 | } else { |
| 90 | rv = hif_diag_read_mem(hif_hdl, (uint32_t)(*pos), |
| 91 | (uint8_t *)read_buffer, count); |
| 92 | } |
| 93 | |
| 94 | if (copy_to_user(buf, read_buffer, count)) { |
| 95 | cdf_mem_free(read_buffer); |
| 96 | HIF_ERROR("%s: copy_to_user error in /proc/%s", |
| 97 | __func__, PROCFS_NAME); |
| 98 | return -EFAULT; |
| 99 | } else |
| 100 | cdf_mem_free(read_buffer); |
| 101 | |
| 102 | if (rv == 0) { |
| 103 | return count; |
| 104 | } else { |
| 105 | return -EIO; |
| 106 | } |
| 107 | } |
| 108 | |
| 109 | static ssize_t ath_procfs_diag_write(struct file *file, |
| 110 | const char __user *buf, |
| 111 | size_t count, loff_t *pos) |
| 112 | { |
| 113 | hif_handle_t hif_hdl; |
| 114 | int rv; |
| 115 | uint8_t *write_buffer = NULL; |
| 116 | |
| 117 | write_buffer = cdf_mem_malloc(count); |
| 118 | if (NULL == write_buffer) { |
| 119 | HIF_ERROR("%s: cdf_mem_alloc failed", __func__); |
| 120 | return -ENOMEM; |
| 121 | } |
| 122 | if (copy_from_user(write_buffer, buf, count)) { |
| 123 | cdf_mem_free(write_buffer); |
| 124 | HIF_ERROR("%s: copy_to_user error in /proc/%s", |
| 125 | __func__, PROCFS_NAME); |
| 126 | return -EFAULT; |
| 127 | } |
| 128 | |
| 129 | hif_hdl = get_hif_hdl_from_file(file); |
| 130 | HIF_DBG("wr buff 0x%p buf 0x%p cnt %zu offset 0x%x value 0x%x", |
| 131 | write_buffer, buf, count, |
| 132 | (int)*pos, *((uint32_t *) write_buffer)); |
| 133 | |
| 134 | if ((count == 4) && ((((uint32_t) (*pos)) & 3) == 0)) { |
| 135 | /* reading a word? */ |
| 136 | uint32_t value = *((uint32_t *)write_buffer); |
| 137 | rv = hif_diag_write_access(hif_hdl, (uint32_t)(*pos), value); |
| 138 | } else { |
| 139 | rv = hif_diag_write_mem(hif_hdl, (uint32_t)(*pos), |
| 140 | (uint8_t *)write_buffer, count); |
| 141 | } |
| 142 | |
| 143 | cdf_mem_free(write_buffer); |
| 144 | if (rv == 0) { |
| 145 | return count; |
| 146 | } else { |
| 147 | return -EIO; |
| 148 | } |
| 149 | } |
| 150 | |
| 151 | static const struct file_operations athdiag_fops = { |
| 152 | .read = ath_procfs_diag_read, |
| 153 | .write = ath_procfs_diag_write, |
| 154 | }; |
| 155 | |
| 156 | /** |
| 157 | *This function is called when the module is loaded |
| 158 | * |
| 159 | */ |
| 160 | int athdiag_procfs_init(void *scn) |
| 161 | { |
| 162 | proc_dir = proc_mkdir(PROCFS_DIR, NULL); |
| 163 | if (proc_dir == NULL) { |
| 164 | remove_proc_entry(PROCFS_DIR, NULL); |
| 165 | HIF_ERROR("%s: Error: Could not initialize /proc/%s", |
| 166 | __func__, PROCFS_DIR); |
| 167 | return -ENOMEM; |
| 168 | } |
| 169 | |
| 170 | proc_file = proc_create_data(PROCFS_NAME, |
| 171 | S_IRUSR | S_IWUSR, proc_dir, |
| 172 | &athdiag_fops, (void *)scn); |
| 173 | if (proc_file == NULL) { |
| 174 | remove_proc_entry(PROCFS_NAME, proc_dir); |
| 175 | HIF_ERROR("%s: Could not initialize /proc/%s", |
| 176 | __func__, PROCFS_NAME); |
| 177 | return -ENOMEM; |
| 178 | } |
| 179 | |
| 180 | HIF_DBG("/proc/%s/%s created", PROCFS_DIR, PROCFS_NAME); |
| 181 | return 0; /* everything is ok */ |
| 182 | } |
| 183 | |
| 184 | /** |
| 185 | *This function is called when the module is unloaded |
| 186 | * |
| 187 | */ |
| 188 | void athdiag_procfs_remove(void) |
| 189 | { |
| 190 | remove_proc_entry(PROCFS_NAME, proc_dir); |
| 191 | HIF_DBG("/proc/%s/%s removed", PROCFS_DIR, PROCFS_NAME); |
| 192 | remove_proc_entry(PROCFS_DIR, NULL); |
| 193 | HIF_DBG("/proc/%s removed", PROCFS_DIR); |
| 194 | } |
| 195 | #else |
| 196 | int athdiag_procfs_init(void *scn) |
| 197 | { |
| 198 | return 0; |
| 199 | } |
| 200 | void athdiag_procfs_remove(void) {} |
| 201 | #endif |