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author | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-04-29 22:12:08 -0400 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-04-29 22:12:08 -0400 |
commit | c0a6720977f89c50473366af965ae28cd8fce923 (patch) | |
tree | f7d0d9fcc56bb03fd87e7e1e83525c906c06bd08 /drivers/w1/slaves | |
parent | f4cce69611ee941bac0729c6069795f106905ef9 (diff) | |
download | linux-3.10-c0a6720977f89c50473366af965ae28cd8fce923.tar.gz linux-3.10-c0a6720977f89c50473366af965ae28cd8fce923.tar.bz2 linux-3.10-c0a6720977f89c50473366af965ae28cd8fce923.zip |
Revert "w1: Add 1-wire slave device driver for DS28E04-100"
This reverts commit f19420c1acb0b573c88a12deb2d42035e22d4a17.
It contained lots of errors and warnings and shouldn't have ever been
applied, that was my fault, sorry.
Cc: Markus Franke <markus.franke@s2002.tu-chemnitz.de>
Cc: Evgeniy Polyakov <zbr@ioremap.net>,
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/w1/slaves')
-rw-r--r-- | drivers/w1/slaves/Kconfig | 7 | ||||
-rw-r--r-- | drivers/w1/slaves/Makefile | 1 | ||||
-rw-r--r-- | drivers/w1/slaves/w1_ds28e04.c | 464 |
3 files changed, 0 insertions, 472 deletions
diff --git a/drivers/w1/slaves/Kconfig b/drivers/w1/slaves/Kconfig index 605ee36c96f..eb9e376d624 100644 --- a/drivers/w1/slaves/Kconfig +++ b/drivers/w1/slaves/Kconfig @@ -94,13 +94,6 @@ config W1_SLAVE_DS2781 If you are unsure, say N. -config W1_SLAVE_DS28E04 - tristate "4096-Bit Addressable 1-Wire EEPROM with PIO (DS28E04-100)" - depends on W1 - help - Say Y here if you want to use a 1-wire - 4kb EEPROM with PIO family device (DS28E04). - config W1_SLAVE_BQ27000 tristate "BQ27000 slave support" depends on W1 diff --git a/drivers/w1/slaves/Makefile b/drivers/w1/slaves/Makefile index 05188f6aab5..c4f1859fb52 100644 --- a/drivers/w1/slaves/Makefile +++ b/drivers/w1/slaves/Makefile @@ -12,4 +12,3 @@ obj-$(CONFIG_W1_SLAVE_DS2760) += w1_ds2760.o obj-$(CONFIG_W1_SLAVE_DS2780) += w1_ds2780.o obj-$(CONFIG_W1_SLAVE_DS2781) += w1_ds2781.o obj-$(CONFIG_W1_SLAVE_BQ27000) += w1_bq27000.o -obj-$(CONFIG_W1_SLAVE_DS28E04) += w1_ds28e04.o diff --git a/drivers/w1/slaves/w1_ds28e04.c b/drivers/w1/slaves/w1_ds28e04.c deleted file mode 100644 index 4aa1aa90480..00000000000 --- a/drivers/w1/slaves/w1_ds28e04.c +++ /dev/null @@ -1,464 +0,0 @@ -/* - * w1_ds28e04.c - w1 family 1C (DS28E04) driver - * - * Copyright (c) 2012 Markus Franke <franke.m@sebakmt.com> - * - * This source code is licensed under the GNU General Public License, - * Version 2. See the file COPYING for more details. - */ - -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/moduleparam.h> -#include <linux/device.h> -#include <linux/types.h> -#include <linux/delay.h> -#include <linux/slab.h> -#include <linux/crc16.h> -#include <linux/uaccess.h> - -#define CRC16_INIT 0 -#define CRC16_VALID 0xb001 - -#include "../w1.h" -#include "../w1_int.h" -#include "../w1_family.h" - -MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Markus Franke <franke.m@sebakmt.com>, <franm@hrz.tu-chemnitz.de>"); -MODULE_DESCRIPTION("w1 family 1C driver for DS28E04, 4kb EEPROM and PIO"); - -/* Allow the strong pullup to be disabled, but default to enabled. - * If it was disabled a parasite powered device might not get the required - * current to copy the data from the scratchpad to EEPROM. If it is enabled parasite powered - * devices have a better chance of getting the current required. - */ -static int w1_strong_pullup = 1; -module_param_named(strong_pullup, w1_strong_pullup, int, 0); - -/* enable/disable CRC checking on DS28E04-100 memory accesses */ -static char w1_enable_crccheck = 1; - -#define W1_EEPROM_SIZE 512 -#define W1_PAGE_COUNT 16 -#define W1_PAGE_SIZE 32 -#define W1_PAGE_BITS 5 -#define W1_PAGE_MASK 0x1F - -#define W1_F1C_READ_EEPROM 0xF0 -#define W1_F1C_WRITE_SCRATCH 0x0F -#define W1_F1C_READ_SCRATCH 0xAA -#define W1_F1C_COPY_SCRATCH 0x55 -#define W1_F1C_ACCESS_WRITE 0x5A - -#define W1_1C_REG_LOGIC_STATE 0x220 - -struct w1_f1C_data { - u8 memory[W1_EEPROM_SIZE]; - u32 validcrc; -}; - -/** - * Check the file size bounds and adjusts count as needed. - * This would not be needed if the file size didn't reset to 0 after a write. - */ -static inline size_t w1_f1C_fix_count(loff_t off, size_t count, size_t size) -{ - if (off > size) - return 0; - - if ((off + count) > size) - return (size - off); - - return count; -} - -static int w1_f1C_refresh_block(struct w1_slave *sl, struct w1_f1C_data *data, - int block) -{ - u8 wrbuf[3]; - int off = block * W1_PAGE_SIZE; - - if (data->validcrc & (1 << block)) - return 0; - - if (w1_reset_select_slave(sl)) { - data->validcrc = 0; - return -EIO; - } - - wrbuf[0] = W1_F1C_READ_EEPROM; - wrbuf[1] = off & 0xff; - wrbuf[2] = off >> 8; - w1_write_block(sl->master, wrbuf, 3); - w1_read_block(sl->master, &data->memory[off], W1_PAGE_SIZE); - - /* cache the block if the CRC is valid */ - if (crc16(CRC16_INIT, &data->memory[off], W1_PAGE_SIZE) == CRC16_VALID) - data->validcrc |= (1 << block); - - return 0; -} - -static int w1_f1C_read(struct w1_slave *sl, int addr, int len, char *data) -{ - u8 wrbuf[3]; - - /* read directly from the EEPROM */ - if (w1_reset_select_slave(sl)) - return -EIO; - - wrbuf[0] = W1_F1C_READ_EEPROM; - wrbuf[1] = addr & 0xff; - wrbuf[2] = addr >> 8; - - w1_write_block(sl->master, wrbuf, sizeof(wrbuf)); - return w1_read_block(sl->master, data, len); -} - -static ssize_t w1_f1C_read_bin(struct file *filp, struct kobject *kobj, - struct bin_attribute *bin_attr, - char *buf, loff_t off, size_t count) -{ - struct w1_slave *sl = kobj_to_w1_slave(kobj); - struct w1_f1C_data *data = sl->family_data; - int i, min_page, max_page; - - if ((count = w1_f1C_fix_count(off, count, W1_EEPROM_SIZE)) == 0) - return 0; - - mutex_lock(&sl->master->mutex); - - if(w1_enable_crccheck) { - min_page = (off >> W1_PAGE_BITS); - max_page = (off + count - 1) >> W1_PAGE_BITS; - for (i = min_page; i <= max_page; i++) { - if (w1_f1C_refresh_block(sl, data, i)) { - count = -EIO; - goto out_up; - } - } - memcpy(buf, &data->memory[off], count); - } - else { - count = w1_f1C_read(sl, off, count, buf); - } - -out_up: - mutex_unlock(&sl->master->mutex); - - return count; -} - -/** - * Writes to the scratchpad and reads it back for verification. - * Then copies the scratchpad to EEPROM. - * The data must be on one page. - * The master must be locked. - * - * @param sl The slave structure - * @param addr Address for the write - * @param len length must be <= (W1_PAGE_SIZE - (addr & W1_PAGE_MASK)) - * @param data The data to write - * @return 0=Success -1=failure - */ -static int w1_f1C_write(struct w1_slave *sl, int addr, int len, const u8 *data) -{ - u8 wrbuf[4]; - u8 rdbuf[W1_PAGE_SIZE + 3]; - u8 es = (addr + len - 1) & 0x1f; - unsigned int tm = 10; - int i; - struct w1_f1C_data *f1C = sl->family_data; - - /* Write the data to the scratchpad */ - if (w1_reset_select_slave(sl)) - return -1; - - wrbuf[0] = W1_F1C_WRITE_SCRATCH; - wrbuf[1] = addr & 0xff; - wrbuf[2] = addr >> 8; - - w1_write_block(sl->master, wrbuf, 3); - w1_write_block(sl->master, data, len); - - /* Read the scratchpad and verify */ - if (w1_reset_select_slave(sl)) - return -1; - - w1_write_8(sl->master, W1_F1C_READ_SCRATCH); - w1_read_block(sl->master, rdbuf, len + 3); - - /* Compare what was read against the data written */ - if ((rdbuf[0] != wrbuf[1]) || (rdbuf[1] != wrbuf[2]) || - (rdbuf[2] != es) || (memcmp(data, &rdbuf[3], len) != 0)) - return -1; - - /* Copy the scratchpad to EEPROM */ - if (w1_reset_select_slave(sl)) - return -1; - - wrbuf[0] = W1_F1C_COPY_SCRATCH; - wrbuf[3] = es; - - for(i = 0; i < sizeof(wrbuf); ++i) { - /* issue 10ms strong pullup (or delay) on the last byte for writing the data from the scratchpad to EEPROM */ - if(w1_strong_pullup && i == sizeof(wrbuf)-1) - w1_next_pullup(sl->master, tm); - - w1_write_8(sl->master, wrbuf[i]); - } - - if(!w1_strong_pullup) - msleep(tm); - - if(w1_enable_crccheck) { - /* invalidate cached data */ - f1C->validcrc &= ~(1 << (addr >> W1_PAGE_BITS)); - } - - /* Reset the bus to wake up the EEPROM (this may not be needed) */ - w1_reset_bus(sl->master); - - return 0; -} - -static ssize_t w1_f1C_write_bin(struct file *filp, struct kobject *kobj, - struct bin_attribute *bin_attr, - char *buf, loff_t off, size_t count) - -{ - struct w1_slave *sl = kobj_to_w1_slave(kobj); - int addr, len, idx; - - if ((count = w1_f1C_fix_count(off, count, W1_EEPROM_SIZE)) == 0) - return 0; - - if(w1_enable_crccheck) { - /* can only write full blocks in cached mode */ - if ((off & W1_PAGE_MASK) || (count & W1_PAGE_MASK)) { - dev_err(&sl->dev, "invalid offset/count off=%d cnt=%zd\n", - (int)off, count); - return -EINVAL; - } - - /* make sure the block CRCs are valid */ - for (idx = 0; idx < count; idx += W1_PAGE_SIZE) { - if (crc16(CRC16_INIT, &buf[idx], W1_PAGE_SIZE) != CRC16_VALID) { - dev_err(&sl->dev, "bad CRC at offset %d\n", (int)off); - return -EINVAL; - } - } - } - - mutex_lock(&sl->master->mutex); - - /* Can only write data to one page at a time */ - idx = 0; - while (idx < count) { - addr = off + idx; - len = W1_PAGE_SIZE - (addr & W1_PAGE_MASK); - if (len > (count - idx)) - len = count - idx; - - if (w1_f1C_write(sl, addr, len, &buf[idx]) < 0) { - count = -EIO; - goto out_up; - } - idx += len; - } - -out_up: - mutex_unlock(&sl->master->mutex); - - return count; -} - -static ssize_t w1_f1C_read_pio(struct file *filp, struct kobject *kobj, - struct bin_attribute *bin_attr, - char *buf, loff_t off, size_t count) - -{ - struct w1_slave *sl = kobj_to_w1_slave(kobj); - int ret; - - /* check arguments */ - if(off != 0 || count != 1 || buf == NULL) - return -EINVAL; - - mutex_lock(&sl->master->mutex); - ret = w1_f1C_read(sl, W1_1C_REG_LOGIC_STATE, count, buf); - mutex_unlock(&sl->master->mutex); - - return ret; -} - -static ssize_t w1_f1C_write_pio(struct file *filp, struct kobject *kobj, - struct bin_attribute *bin_attr, - char *buf, loff_t off, size_t count) - -{ - struct w1_slave *sl = kobj_to_w1_slave(kobj); - u8 wrbuf[3]; - u8 ack; - - /* check arguments */ - if(off != 0 || count != 1 || buf == NULL) - return -EINVAL; - - mutex_lock(&sl->master->mutex); - - /* Write the PIO data */ - if (w1_reset_select_slave(sl)) { - mutex_unlock(&sl->master->mutex); - return -1; - } - - /* set bit 7..2 to value '1' */ - *buf = *buf | 0xFC; - - wrbuf[0] = W1_F1C_ACCESS_WRITE; - wrbuf[1] = *buf; - wrbuf[2] = ~(*buf); - w1_write_block(sl->master, wrbuf, 3); - - w1_read_block(sl->master, &ack, sizeof(ack)); - - mutex_unlock(&sl->master->mutex); - - /* check for acknowledgement */ - if(ack != 0xAA) return -EIO; - - return count; -} - -static ssize_t w1_f1C_show_crccheck(struct device *dev, struct device_attribute *attr, - char *buf) -{ - if(put_user(w1_enable_crccheck + 0x30, buf)) - return -EFAULT; - - return sizeof(w1_enable_crccheck); -} - -static ssize_t w1_f1C_store_crccheck(struct device *dev, struct device_attribute *attr, - const char *buf, size_t count) -{ - char val; - - if(count != 1 || !buf) return -EINVAL; - - if(get_user(val, buf)) - return -EFAULT; - - /* convert to decimal */ - val = val - 0x30; - if(val != 0 && val != 1) return -EINVAL; - - /* set the new value */ - w1_enable_crccheck = val; - - return sizeof(w1_enable_crccheck); -} - -#define NB_SYSFS_BIN_FILES 2 -static struct bin_attribute w1_f1C_bin_attr[NB_SYSFS_BIN_FILES] = { - { - .attr = { - .name = "eeprom", - .mode = S_IRUGO | S_IWUSR, - }, - .size = W1_EEPROM_SIZE, - .read = w1_f1C_read_bin, - .write = w1_f1C_write_bin, - }, - { - .attr = { - .name = "pio", - .mode = S_IRUGO | S_IWUSR, - }, - .size = 1, - .read = w1_f1C_read_pio, - .write = w1_f1C_write_pio, - } -}; - -static DEVICE_ATTR(crccheck, S_IWUSR | S_IRUGO, w1_f1C_show_crccheck, w1_f1C_store_crccheck); - -static int w1_f1C_add_slave(struct w1_slave *sl) -{ - int err = 0; - int i; - struct w1_f1C_data *data = NULL; - - if(w1_enable_crccheck) { - data = kzalloc(sizeof(struct w1_f1C_data), GFP_KERNEL); - if (!data) - return -ENOMEM; - sl->family_data = data; - } - - /* create binary sysfs attributes */ - for (i = 0; i < NB_SYSFS_BIN_FILES && !err; ++i) - err = sysfs_create_bin_file(&sl->dev.kobj, &(w1_f1C_bin_attr[i])); - - if(err) - goto out; - - /* create device attributes */ - err = device_create_file(&sl->dev, &dev_attr_crccheck); - - if(err) { - /* remove binary sysfs attributes */ - for (i = 0; i < NB_SYSFS_BIN_FILES; ++i) - sysfs_remove_bin_file(&sl->dev.kobj, &(w1_f1C_bin_attr[i])); - } - -out: - if(err) { - if(w1_enable_crccheck) - kfree(data); - } - - return err; -} - -static void w1_f1C_remove_slave(struct w1_slave *sl) -{ - int i; - - if(w1_enable_crccheck) { - kfree(sl->family_data); - sl->family_data = NULL; - } - - /* remove device attributes */ - device_remove_file(&sl->dev, &dev_attr_crccheck); - - /* remove binary sysfs attributes */ - for (i = 0; i < NB_SYSFS_BIN_FILES; ++i) - sysfs_remove_bin_file(&sl->dev.kobj, &(w1_f1C_bin_attr[i])); -} - -static struct w1_family_ops w1_f1C_fops = { - .add_slave = w1_f1C_add_slave, - .remove_slave = w1_f1C_remove_slave, -}; - -static struct w1_family w1_family_1C = { - .fid = W1_FAMILY_DS28E04, - .fops = &w1_f1C_fops, -}; - -static int __init w1_f1C_init(void) -{ - return w1_register_family(&w1_family_1C); -} - -static void __exit w1_f1C_fini(void) -{ - w1_unregister_family(&w1_family_1C); -} - -module_init(w1_f1C_init); -module_exit(w1_f1C_fini); |