eeprom: Remove deprecated legacy eeprom driver

-14

drivers/misc/eeprom/Kconfig

··· 46 46 This driver can also be built as a module. If so, the module 47 47 will be called at25. 48 48 49 - config EEPROM_LEGACY 50 - tristate "Old I2C EEPROM reader (DEPRECATED)" 51 - depends on I2C && SYSFS 52 - help 53 - If you say yes here you get read-only access to the EEPROM data 54 - available on modern memory DIMMs and Sony Vaio laptops via I2C. Such 55 - EEPROMs could theoretically be available on other devices as well. 56 - 57 - This driver is deprecated and will be removed soon, please use the 58 - better at24 driver instead. 59 - 60 - This driver can also be built as a module. If so, the module 61 - will be called eeprom. 62 - 63 49 config EEPROM_MAX6875 64 50 tristate "Maxim MAX6874/5 power supply supervisor" 65 51 depends on I2C

-1

drivers/misc/eeprom/Makefile

··· 1 1 # SPDX-License-Identifier: GPL-2.0 2 2 obj-$(CONFIG_EEPROM_AT24) += at24.o 3 3 obj-$(CONFIG_EEPROM_AT25) += at25.o 4 - obj-$(CONFIG_EEPROM_LEGACY) += eeprom.o 5 4 obj-$(CONFIG_EEPROM_MAX6875) += max6875.o 6 5 obj-$(CONFIG_EEPROM_93CX6) += eeprom_93cx6.o 7 6 obj-$(CONFIG_EEPROM_93XX46) += eeprom_93xx46.o

-214

drivers/misc/eeprom/eeprom.c

··· 1 - // SPDX-License-Identifier: GPL-2.0-or-later 2 - /* 3 - * Copyright (C) 1998, 1999 Frodo Looijaard <frodol@dds.nl> and 4 - * Philip Edelbrock <phil@netroedge.com> 5 - * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com> 6 - * Copyright (C) 2003 IBM Corp. 7 - * Copyright (C) 2004 Jean Delvare <jdelvare@suse.de> 8 - */ 9 - 10 - #include <linux/kernel.h> 11 - #include <linux/module.h> 12 - #include <linux/device.h> 13 - #include <linux/capability.h> 14 - #include <linux/jiffies.h> 15 - #include <linux/i2c.h> 16 - #include <linux/mutex.h> 17 - 18 - /* Addresses to scan */ 19 - static const unsigned short normal_i2c[] = { 0x50, 0x51, 0x52, 0x53, 0x54, 20 - 0x55, 0x56, 0x57, I2C_CLIENT_END }; 21 - 22 - 23 - /* Size of EEPROM in bytes */ 24 - #define EEPROM_SIZE 256 25 - 26 - /* possible types of eeprom devices */ 27 - enum eeprom_nature { 28 - UNKNOWN, 29 - VAIO, 30 - }; 31 - 32 - /* Each client has this additional data */ 33 - struct eeprom_data { 34 - struct mutex update_lock; 35 - u8 valid; /* bitfield, bit!=0 if slice is valid */ 36 - unsigned long last_updated[8]; /* In jiffies, 8 slices */ 37 - u8 data[EEPROM_SIZE]; /* Register values */ 38 - enum eeprom_nature nature; 39 - }; 40 - 41 - 42 - static void eeprom_update_client(struct i2c_client *client, u8 slice) 43 - { 44 - struct eeprom_data *data = i2c_get_clientdata(client); 45 - int i; 46 - 47 - mutex_lock(&data->update_lock); 48 - 49 - if (!(data->valid & (1 << slice)) || 50 - time_after(jiffies, data->last_updated[slice] + 300 * HZ)) { 51 - dev_dbg(&client->dev, "Starting eeprom update, slice %u\n", slice); 52 - 53 - if (i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_READ_I2C_BLOCK)) { 54 - for (i = slice << 5; i < (slice + 1) << 5; i += 32) 55 - if (i2c_smbus_read_i2c_block_data(client, i, 56 - 32, data->data + i) 57 - != 32) 58 - goto exit; 59 - } else { 60 - for (i = slice << 5; i < (slice + 1) << 5; i += 2) { 61 - int word = i2c_smbus_read_word_data(client, i); 62 - if (word < 0) 63 - goto exit; 64 - data->data[i] = word & 0xff; 65 - data->data[i + 1] = word >> 8; 66 - } 67 - } 68 - data->last_updated[slice] = jiffies; 69 - data->valid |= (1 << slice); 70 - } 71 - exit: 72 - mutex_unlock(&data->update_lock); 73 - } 74 - 75 - static ssize_t eeprom_read(struct file *filp, struct kobject *kobj, 76 - struct bin_attribute *bin_attr, 77 - char *buf, loff_t off, size_t count) 78 - { 79 - struct i2c_client *client = kobj_to_i2c_client(kobj); 80 - struct eeprom_data *data = i2c_get_clientdata(client); 81 - u8 slice; 82 - 83 - /* Only refresh slices which contain requested bytes */ 84 - for (slice = off >> 5; slice <= (off + count - 1) >> 5; slice++) 85 - eeprom_update_client(client, slice); 86 - 87 - /* Hide Vaio private settings to regular users: 88 - - BIOS passwords: bytes 0x00 to 0x0f 89 - - UUID: bytes 0x10 to 0x1f 90 - - Serial number: 0xc0 to 0xdf */ 91 - if (data->nature == VAIO && !capable(CAP_SYS_ADMIN)) { 92 - int i; 93 - 94 - for (i = 0; i < count; i++) { 95 - if ((off + i <= 0x1f) || 96 - (off + i >= 0xc0 && off + i <= 0xdf)) 97 - buf[i] = 0; 98 - else 99 - buf[i] = data->data[off + i]; 100 - } 101 - } else { 102 - memcpy(buf, &data->data[off], count); 103 - } 104 - 105 - return count; 106 - } 107 - 108 - static const struct bin_attribute eeprom_attr = { 109 - .attr = { 110 - .name = "eeprom", 111 - .mode = S_IRUGO, 112 - }, 113 - .size = EEPROM_SIZE, 114 - .read = eeprom_read, 115 - }; 116 - 117 - /* Return 0 if detection is successful, -ENODEV otherwise */ 118 - static int eeprom_detect(struct i2c_client *client, struct i2c_board_info *info) 119 - { 120 - struct i2c_adapter *adapter = client->adapter; 121 - 122 - /* EDID EEPROMs are often 24C00 EEPROMs, which answer to all 123 - addresses 0x50-0x57, but we only care about 0x50. So decline 124 - attaching to addresses >= 0x51 on DDC buses */ 125 - if (!(adapter->class & I2C_CLASS_SPD) && client->addr >= 0x51) 126 - return -ENODEV; 127 - 128 - /* There are four ways we can read the EEPROM data: 129 - (1) I2C block reads (faster, but unsupported by most adapters) 130 - (2) Word reads (128% overhead) 131 - (3) Consecutive byte reads (88% overhead, unsafe) 132 - (4) Regular byte data reads (265% overhead) 133 - The third and fourth methods are not implemented by this driver 134 - because all known adapters support one of the first two. */ 135 - if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_READ_WORD_DATA) 136 - && !i2c_check_functionality(adapter, I2C_FUNC_SMBUS_READ_I2C_BLOCK)) 137 - return -ENODEV; 138 - 139 - strscpy(info->type, "eeprom", I2C_NAME_SIZE); 140 - 141 - return 0; 142 - } 143 - 144 - static int eeprom_probe(struct i2c_client *client) 145 - { 146 - struct i2c_adapter *adapter = client->adapter; 147 - struct eeprom_data *data; 148 - 149 - data = devm_kzalloc(&client->dev, sizeof(struct eeprom_data), 150 - GFP_KERNEL); 151 - if (!data) 152 - return -ENOMEM; 153 - 154 - memset(data->data, 0xff, EEPROM_SIZE); 155 - i2c_set_clientdata(client, data); 156 - mutex_init(&data->update_lock); 157 - data->nature = UNKNOWN; 158 - 159 - /* Detect the Vaio nature of EEPROMs. 160 - We use the "PCG-" or "VGN-" prefix as the signature. */ 161 - if (client->addr == 0x57 162 - && i2c_check_functionality(adapter, I2C_FUNC_SMBUS_READ_BYTE_DATA)) { 163 - char name[4]; 164 - 165 - name[0] = i2c_smbus_read_byte_data(client, 0x80); 166 - name[1] = i2c_smbus_read_byte_data(client, 0x81); 167 - name[2] = i2c_smbus_read_byte_data(client, 0x82); 168 - name[3] = i2c_smbus_read_byte_data(client, 0x83); 169 - 170 - if (!memcmp(name, "PCG-", 4) || !memcmp(name, "VGN-", 4)) { 171 - dev_info(&client->dev, "Vaio EEPROM detected, " 172 - "enabling privacy protection\n"); 173 - data->nature = VAIO; 174 - } 175 - } 176 - 177 - /* Let the users know they are using deprecated driver */ 178 - dev_notice(&client->dev, 179 - "eeprom driver is deprecated, please use at24 instead\n"); 180 - 181 - /* create the sysfs eeprom file */ 182 - return sysfs_create_bin_file(&client->dev.kobj, &eeprom_attr); 183 - } 184 - 185 - static void eeprom_remove(struct i2c_client *client) 186 - { 187 - sysfs_remove_bin_file(&client->dev.kobj, &eeprom_attr); 188 - } 189 - 190 - static const struct i2c_device_id eeprom_id[] = { 191 - { "eeprom", 0 }, 192 - { } 193 - }; 194 - 195 - static struct i2c_driver eeprom_driver = { 196 - .driver = { 197 - .name = "eeprom", 198 - }, 199 - .probe = eeprom_probe, 200 - .remove = eeprom_remove, 201 - .id_table = eeprom_id, 202 - 203 - .class = I2C_CLASS_DDC | I2C_CLASS_SPD, 204 - .detect = eeprom_detect, 205 - .address_list = normal_i2c, 206 - }; 207 - 208 - module_i2c_driver(eeprom_driver); 209 - 210 - MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and " 211 - "Philip Edelbrock <phil@netroedge.com> and " 212 - "Greg Kroah-Hartman <greg@kroah.com>"); 213 - MODULE_DESCRIPTION("I2C EEPROM driver"); 214 - MODULE_LICENSE("GPL");

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