diff options
Diffstat (limited to 'drivers/misc/eeprom')
| -rw-r--r-- | drivers/misc/eeprom/at24.c | 65 | ||||
| -rw-r--r-- | drivers/misc/eeprom/at25.c | 6 | ||||
| -rw-r--r-- | drivers/misc/eeprom/eeprom.c | 39 | ||||
| -rw-r--r-- | drivers/misc/eeprom/eeprom_93cx6.c | 39 | ||||
| -rw-r--r-- | drivers/misc/eeprom/max6875.c | 54 |
5 files changed, 117 insertions, 86 deletions
diff --git a/drivers/misc/eeprom/at24.c b/drivers/misc/eeprom/at24.c index db7d0f21b65d..f7ca3a42b490 100644 --- a/drivers/misc/eeprom/at24.c +++ b/drivers/misc/eeprom/at24.c @@ -54,7 +54,7 @@ struct at24_data { struct at24_platform_data chip; struct memory_accessor macc; - bool use_smbus; + int use_smbus; /* * Lock protects against activities from other Linux tasks, @@ -184,11 +184,19 @@ static ssize_t at24_eeprom_read(struct at24_data *at24, char *buf, if (count > io_limit) count = io_limit; - if (at24->use_smbus) { + switch (at24->use_smbus) { + case I2C_SMBUS_I2C_BLOCK_DATA: /* Smaller eeproms can work given some SMBus extension calls */ if (count > I2C_SMBUS_BLOCK_MAX) count = I2C_SMBUS_BLOCK_MAX; - } else { + break; + case I2C_SMBUS_WORD_DATA: + count = 2; + break; + case I2C_SMBUS_BYTE_DATA: + count = 1; + break; + default: /* * When we have a better choice than SMBus calls, use a * combined I2C message. Write address; then read up to @@ -219,10 +227,27 @@ static ssize_t at24_eeprom_read(struct at24_data *at24, char *buf, timeout = jiffies + msecs_to_jiffies(write_timeout); do { read_time = jiffies; - if (at24->use_smbus) { + switch (at24->use_smbus) { + case I2C_SMBUS_I2C_BLOCK_DATA: status = i2c_smbus_read_i2c_block_data(client, offset, count, buf); - } else { + break; + case I2C_SMBUS_WORD_DATA: + status = i2c_smbus_read_word_data(client, offset); + if (status >= 0) { + buf[0] = status & 0xff; + buf[1] = status >> 8; + status = count; + } + break; + case I2C_SMBUS_BYTE_DATA: + status = i2c_smbus_read_byte_data(client, offset); + if (status >= 0) { + buf[0] = status; + status = count; + } + break; + default: status = i2c_transfer(client->adapter, msg, 2); if (status == 2) status = count; @@ -274,7 +299,8 @@ static ssize_t at24_read(struct at24_data *at24, return retval; } -static ssize_t at24_bin_read(struct kobject *kobj, struct bin_attribute *attr, +static ssize_t at24_bin_read(struct file *filp, struct kobject *kobj, + struct bin_attribute *attr, char *buf, loff_t off, size_t count) { struct at24_data *at24; @@ -395,7 +421,8 @@ static ssize_t at24_write(struct at24_data *at24, const char *buf, loff_t off, return retval; } -static ssize_t at24_bin_write(struct kobject *kobj, struct bin_attribute *attr, +static ssize_t at24_bin_write(struct file *filp, struct kobject *kobj, + struct bin_attribute *attr, char *buf, loff_t off, size_t count) { struct at24_data *at24; @@ -434,7 +461,7 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct at24_platform_data chip; bool writable; - bool use_smbus = false; + int use_smbus = 0; struct at24_data *at24; int err; unsigned i, num_addresses; @@ -475,12 +502,19 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id) err = -EPFNOSUPPORT; goto err_out; } - if (!i2c_check_functionality(client->adapter, + if (i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_READ_I2C_BLOCK)) { + use_smbus = I2C_SMBUS_I2C_BLOCK_DATA; + } else if (i2c_check_functionality(client->adapter, + I2C_FUNC_SMBUS_READ_WORD_DATA)) { + use_smbus = I2C_SMBUS_WORD_DATA; + } else if (i2c_check_functionality(client->adapter, + I2C_FUNC_SMBUS_READ_BYTE_DATA)) { + use_smbus = I2C_SMBUS_BYTE_DATA; + } else { err = -EPFNOSUPPORT; goto err_out; } - use_smbus = true; } if (chip.flags & AT24_FLAG_TAKE8ADDR) @@ -566,11 +600,16 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id) dev_info(&client->dev, "%zu byte %s EEPROM %s\n", at24->bin.size, client->name, writable ? "(writable)" : "(read-only)"); + if (use_smbus == I2C_SMBUS_WORD_DATA || + use_smbus == I2C_SMBUS_BYTE_DATA) { + dev_notice(&client->dev, "Falling back to %s reads, " + "performance will suffer\n", use_smbus == + I2C_SMBUS_WORD_DATA ? "word" : "byte"); + } dev_dbg(&client->dev, - "page_size %d, num_addresses %d, write_max %d%s\n", + "page_size %d, num_addresses %d, write_max %d, use_smbus %d\n", chip.page_size, num_addresses, - at24->write_max, - use_smbus ? ", use_smbus" : ""); + at24->write_max, use_smbus); /* export data to kernel code */ if (chip.setup) diff --git a/drivers/misc/eeprom/at25.c b/drivers/misc/eeprom/at25.c index d194212a41f6..c627e4174ccd 100644 --- a/drivers/misc/eeprom/at25.c +++ b/drivers/misc/eeprom/at25.c @@ -126,7 +126,8 @@ at25_ee_read( } static ssize_t -at25_bin_read(struct kobject *kobj, struct bin_attribute *bin_attr, +at25_bin_read(struct file *filp, struct kobject *kobj, + struct bin_attribute *bin_attr, char *buf, loff_t off, size_t count) { struct device *dev; @@ -253,7 +254,8 @@ at25_ee_write(struct at25_data *at25, const char *buf, loff_t off, } static ssize_t -at25_bin_write(struct kobject *kobj, struct bin_attribute *bin_attr, +at25_bin_write(struct file *filp, struct kobject *kobj, + struct bin_attribute *bin_attr, char *buf, loff_t off, size_t count) { struct device *dev; diff --git a/drivers/misc/eeprom/eeprom.c b/drivers/misc/eeprom/eeprom.c index f939ebc2507c..45060ddc4e59 100644 --- a/drivers/misc/eeprom/eeprom.c +++ b/drivers/misc/eeprom/eeprom.c @@ -1,24 +1,20 @@ /* - Copyright (C) 1998, 1999 Frodo Looijaard <frodol@dds.nl> and - Philip Edelbrock <phil@netroedge.com> - Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com> - Copyright (C) 2003 IBM Corp. - Copyright (C) 2004 Jean Delvare <khali@linux-fr.org> - - This program is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 2 of the License, or - (at your option) any later version. - - This program is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - GNU General Public License for more details. - - You should have received a copy of the GNU General Public License - along with this program; if not, write to the Free Software - Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. -*/ + * Copyright (C) 1998, 1999 Frodo Looijaard <frodol@dds.nl> and + * Philip Edelbrock <phil@netroedge.com> + * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com> + * Copyright (C) 2003 IBM Corp. + * Copyright (C) 2004 Jean Delvare <khali@linux-fr.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ #include <linux/kernel.h> #include <linux/init.h> @@ -85,7 +81,8 @@ exit: mutex_unlock(&data->update_lock); } -static ssize_t eeprom_read(struct kobject *kobj, struct bin_attribute *bin_attr, +static ssize_t eeprom_read(struct file *filp, struct kobject *kobj, + struct bin_attribute *bin_attr, char *buf, loff_t off, size_t count) { struct i2c_client *client = to_i2c_client(container_of(kobj, struct device, kobj)); diff --git a/drivers/misc/eeprom/eeprom_93cx6.c b/drivers/misc/eeprom/eeprom_93cx6.c index 15b1780025c8..7b33de95c4bf 100644 --- a/drivers/misc/eeprom/eeprom_93cx6.c +++ b/drivers/misc/eeprom/eeprom_93cx6.c @@ -1,27 +1,20 @@ /* - Copyright (C) 2004 - 2006 rt2x00 SourceForge Project - <http://rt2x00.serialmonkey.com> - - This program is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 2 of the License, or - (at your option) any later version. - - This program is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - GNU General Public License for more details. - - You should have received a copy of the GNU General Public License - along with this program; if not, write to the - Free Software Foundation, Inc., - 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. - */ - -/* - Module: eeprom_93cx6 - Abstract: EEPROM reader routines for 93cx6 chipsets. - Supported chipsets: 93c46 & 93c66. + * Copyright (C) 2004 - 2006 rt2x00 SourceForge Project + * <http://rt2x00.serialmonkey.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * Module: eeprom_93cx6 + * Abstract: EEPROM reader routines for 93cx6 chipsets. + * Supported chipsets: 93c46 & 93c66. */ #include <linux/kernel.h> diff --git a/drivers/misc/eeprom/max6875.c b/drivers/misc/eeprom/max6875.c index 5a6b2bce8ad5..5653a3ce0517 100644 --- a/drivers/misc/eeprom/max6875.c +++ b/drivers/misc/eeprom/max6875.c @@ -1,30 +1,30 @@ /* - max6875.c - driver for MAX6874/MAX6875 - - Copyright (C) 2005 Ben Gardner <bgardner@wabtec.com> - - Based on eeprom.c - - The MAX6875 has a bank of registers and two banks of EEPROM. - Address ranges are defined as follows: - * 0x0000 - 0x0046 = configuration registers - * 0x8000 - 0x8046 = configuration EEPROM - * 0x8100 - 0x82FF = user EEPROM - - This driver makes the user EEPROM available for read. - - The registers & config EEPROM should be accessed via i2c-dev. - - The MAX6875 ignores the lowest address bit, so each chip responds to - two addresses - 0x50/0x51 and 0x52/0x53. - - Note that the MAX6875 uses i2c_smbus_write_byte_data() to set the read - address, so this driver is destructive if loaded for the wrong EEPROM chip. - - This program is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License as published by - the Free Software Foundation; version 2 of the License. -*/ + * max6875.c - driver for MAX6874/MAX6875 + * + * Copyright (C) 2005 Ben Gardner <bgardner@wabtec.com> + * + * Based on eeprom.c + * + * The MAX6875 has a bank of registers and two banks of EEPROM. + * Address ranges are defined as follows: + * * 0x0000 - 0x0046 = configuration registers + * * 0x8000 - 0x8046 = configuration EEPROM + * * 0x8100 - 0x82FF = user EEPROM + * + * This driver makes the user EEPROM available for read. + * + * The registers & config EEPROM should be accessed via i2c-dev. + * + * The MAX6875 ignores the lowest address bit, so each chip responds to + * two addresses - 0x50/0x51 and 0x52/0x53. + * + * Note that the MAX6875 uses i2c_smbus_write_byte_data() to set the read + * address, so this driver is destructive if loaded for the wrong EEPROM chip. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + */ #include <linux/kernel.h> #include <linux/init.h> @@ -107,7 +107,7 @@ exit_up: mutex_unlock(&data->update_lock); } -static ssize_t max6875_read(struct kobject *kobj, +static ssize_t max6875_read(struct file *filp, struct kobject *kobj, struct bin_attribute *bin_attr, char *buf, loff_t off, size_t count) { |