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Release 4.11 drivers/w1/slaves/w1_ds2433.c

/*
 *      w1_ds2433.c - w1 family 23 (DS2433) driver
 *
 * Copyright (c) 2005 Ben Gardner <bgardner@wabtec.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>
#ifdef CONFIG_W1_SLAVE_DS2433_CRC
#include <linux/crc16.h>


#define CRC16_INIT		0

#define CRC16_VALID		0xb001

#endif

#include "../w1.h"
#include "../w1_int.h"
#include "../w1_family.h"

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Ben Gardner <bgardner@wabtec.com>");
MODULE_DESCRIPTION("w1 family 23 driver for DS2433, 4kb EEPROM");
MODULE_ALIAS("w1-family-" __stringify(W1_EEPROM_DS2433));


#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_F23_TIME		300


#define W1_F23_READ_EEPROM	0xF0

#define W1_F23_WRITE_SCRATCH	0x0F

#define W1_F23_READ_SCRATCH	0xAA

#define W1_F23_COPY_SCRATCH	0x55


struct w1_f23_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_f23_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; }

Contributors

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Evgeniy Polyakov45100.00%1100.00%
Total45100.00%1100.00%

#ifdef CONFIG_W1_SLAVE_DS2433_CRC
static int w1_f23_refresh_block(struct w1_slave *sl, struct w1_f23_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_F23_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; }

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Evgeniy Polyakov152100.00%1100.00%
Total152100.00%1100.00%

#endif /* CONFIG_W1_SLAVE_DS2433_CRC */
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 w1_slave *sl = kobj_to_w1_slave(kobj); #ifdef CONFIG_W1_SLAVE_DS2433_CRC struct w1_f23_data *data = sl->family_data; int i, min_page, max_page; #else u8 wrbuf[3]; #endif if ((count = w1_f23_fix_count(off, count, W1_EEPROM_SIZE)) == 0) return 0; mutex_lock(&sl->master->bus_mutex); #ifdef CONFIG_W1_SLAVE_DS2433_CRC min_page = (off >> W1_PAGE_BITS); max_page = (off + count - 1) >> W1_PAGE_BITS; for (i = min_page; i <= max_page; i++) { if (w1_f23_refresh_block(sl, data, i)) { count = -EIO; goto out_up; } } memcpy(buf, &data->memory[off], count); #else /* CONFIG_W1_SLAVE_DS2433_CRC */ /* read directly from the EEPROM */ if (w1_reset_select_slave(sl)) { count = -EIO; goto out_up; } wrbuf[0] = W1_F23_READ_EEPROM; wrbuf[1] = off & 0xff; wrbuf[2] = off >> 8; w1_write_block(sl->master, wrbuf, 3); w1_read_block(sl->master, buf, count); #endif /* CONFIG_W1_SLAVE_DS2433_CRC */ out_up: mutex_unlock(&sl->master->bus_mutex); return count; }

Contributors

PersonTokensPropCommitsCommitProp
Evgeniy Polyakov24795.00%450.00%
Chris Wright51.92%112.50%
Rui Zhang51.92%112.50%
Neil Brown20.77%112.50%
Greg Kroah-Hartman10.38%112.50%
Total260100.00%8100.00%

/** * 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_f23_write(struct w1_slave *sl, int addr, int len, const u8 *data) { #ifdef CONFIG_W1_SLAVE_DS2433_CRC struct w1_f23_data *f23 = sl->family_data; #endif u8 wrbuf[4]; u8 rdbuf[W1_PAGE_SIZE + 3]; u8 es = (addr + len - 1) & 0x1f; /* Write the data to the scratchpad */ if (w1_reset_select_slave(sl)) return -1; wrbuf[0] = W1_F23_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_F23_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_F23_COPY_SCRATCH; wrbuf[3] = es; w1_write_block(sl->master, wrbuf, 4); /* Sleep for 5 ms to wait for the write to complete */ msleep(5); /* Reset the bus to wake up the EEPROM (this may not be needed) */ w1_reset_bus(sl->master); #ifdef CONFIG_W1_SLAVE_DS2433_CRC f23->validcrc &= ~(1 << (addr >> W1_PAGE_BITS)); #endif return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Evgeniy Polyakov25388.15%150.00%
Ben Gardner3411.85%150.00%
Total287100.00%2100.00%


static ssize_t eeprom_write(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_f23_fix_count(off, count, W1_EEPROM_SIZE)) == 0) return 0; #ifdef CONFIG_W1_SLAVE_DS2433_CRC /* 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; } } #endif /* CONFIG_W1_SLAVE_DS2433_CRC */ mutex_lock(&sl->master->bus_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_f23_write(sl, addr, len, &buf[idx]) < 0) { count = -EIO; goto out_up; } idx += len; } out_up: mutex_unlock(&sl->master->bus_mutex); return count; }

Contributors

PersonTokensPropCommitsCommitProp
Evgeniy Polyakov25795.19%555.56%
Chris Wright51.85%111.11%
Rui Zhang51.85%111.11%
Neil Brown20.74%111.11%
Greg Kroah-Hartman10.37%111.11%
Total270100.00%9100.00%

static BIN_ATTR_RW(eeprom, W1_EEPROM_SIZE); static struct bin_attribute *w1_f23_bin_attributes[] = { &bin_attr_eeprom, NULL, }; static const struct attribute_group w1_f23_group = { .bin_attrs = w1_f23_bin_attributes, }; static const struct attribute_group *w1_f23_groups[] = { &w1_f23_group, NULL, };
static int w1_f23_add_slave(struct w1_slave *sl) { #ifdef CONFIG_W1_SLAVE_DS2433_CRC struct w1_f23_data *data; data = kzalloc(sizeof(struct w1_f23_data), GFP_KERNEL); if (!data) return -ENOMEM; sl->family_data = data; #endif /* CONFIG_W1_SLAVE_DS2433_CRC */ return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Evgeniy Polyakov5196.23%360.00%
Greg Kroah-Hartman11.89%120.00%
Yoann Padioleau11.89%120.00%
Total53100.00%5100.00%


static void w1_f23_remove_slave(struct w1_slave *sl) { #ifdef CONFIG_W1_SLAVE_DS2433_CRC kfree(sl->family_data); sl->family_data = NULL; #endif /* CONFIG_W1_SLAVE_DS2433_CRC */ }

Contributors

PersonTokensPropCommitsCommitProp
Evgeniy Polyakov30100.00%3100.00%
Total30100.00%3100.00%

static struct w1_family_ops w1_f23_fops = { .add_slave = w1_f23_add_slave, .remove_slave = w1_f23_remove_slave, .groups = w1_f23_groups, }; static struct w1_family w1_family_23 = { .fid = W1_EEPROM_DS2433, .fops = &w1_f23_fops, }; module_w1_family(w1_family_23);

Overall Contributors

PersonTokensPropCommitsCommitProp
Evgeniy Polyakov120590.94%640.00%
Greg Kroah-Hartman473.55%16.67%
Ben Gardner342.57%16.67%
Chris Wright100.75%16.67%
Rui Zhang100.75%16.67%
Alexander Stein90.68%16.67%
Neil Brown40.30%16.67%
Tejun Heo30.23%16.67%
Andrew F. Davis20.15%16.67%
Yoann Padioleau10.08%16.67%
Total1325100.00%15100.00%
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