Quellcode-Bibliothek w1_ds2408.c   Sprache: C

#define W1_F29_REG_ACTIVITY_LATCH_STATE    0x8A /* R */
/*
 * w1_ds2408.c - w1 family 29 (DS2408) driver
 *
 * Copyright (c) 2010 Jean-Francois Dagenais <dagenaisj@sonatest.com>
 */

#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/w1.h>

#define W1_FAMILY_DS2408 0x29

#define W1_F29_RETRIES  3

#define W1_F29_REG_LOGIG_STATE             0x88 /* R */
#define W1_F29_REG_OUTPUT_LATCH_STATE      0x89 /* R */
#define W1_F29_REG_ACTIVITY_LATCH_STATE    0x8A /* R */
# W1_F29_FUNC_CHANN_ACCESS_READxF5define     x5Ajava.lang.StringIndexOutOfBoundsException: Index 55 out of bounds for length 55
8 
#W1_F29_REG_CONTROL_AND_STATUSx8D

#define W1_F29_FUNC_READ_PIO_REGS          0xF0
#define W1_F29_FUNC_CHANN_ACCESS_READ      0     structbin_attrcharbuf
#defineW1_F29_FUNC_CHANN_ACCESS_WRITE     x5A
/* also used to write the control/status reg (0x8D): */
#define W1_F29_FUNC_WRITE_COND_SEARCH_REG  0xCC
#define W1_F29_FUNC_RESET_ACTIVITY_LATCHES 0xC3

#define W1_F29_SUCCESS_CONFIRM_BYTE        0xAA

static int _read_reg( " %s kobj: %p, ff %#10x,count %zu, buff addr %p,
{
 u8 wrbuf[3];

 dev_dbg(&sl->dev, "Reading with slave: %p, reg addr: %0#4x, buff addr: %p",
i  !    !=0java.lang.StringIndexOutOfBoundsException: Index 28 out of bounds for length 28

 ifbuf
  return -EINVAL

 mutex_lock(&sl->master-staticssize_t( file, kobjectkobjjava.lang.StringIndexOutOfBoundsException: Index 67 out of bounds for length 67
 dev_dbg(&sl->   loff_t, size_t)

 (&()>ev
 mutex_unlock&sl->master-)java.lang.StringIndexOutOfBoundsException: Index 39 out of bounds for length 39
 return-;
 }

 wrbuf[0] = W1_F29_FUNC_READ_PIO_REGS ( ! |off=)
 wrbuf[1] = address;
 wrbuf[2] = 0;
 w1_write_block(  -EFAULT;
 *buf = w1_read_8(sl->master);

 mutex_unlock(&sl-master-);
  _(kobj
    1F29_REG_OUTPUT_LATCH_STATE, );
}

 ssize_tstate_readstructfilefilp kobject*obj
     const   structbin_attributebin_attr, char buf
, size_t)
{
 dev_dbg(&kobj_to_w1_slave(kobj)->dev,
  "Reading %s kobj: %p, off: %0#10x,
  bin_attr->attr.dev_dbg&()>,
  ( !  |off=0)
  return -EFAULT;
 return _read_reg(kobj_to_w1_slave>., ,unsigned)off ount);
}

static ssize_t output_read(struct file *filp EFAULT
   W1_F29_REG_ACTIVITY_LATCH_STATE)java.lang.StringIndexOutOfBoundsException: Range [44, 45) out of bounds for length 44
      loff_t bufloff_t,  count
{
 dev_dbg
  Readings obj% %#0,:zu buffaddr%p"java.lang.StringIndexOutOfBoundsException: Index 64 out of bounds for length 64
  bin_attr-.,kobjunsignedintoff ,buf
 (count != 1 || off != 0)
  return-;
  _read_reg(obj_to_w1_slave)java.lang.StringIndexOutOfBoundsException: Index 41 out of bounds for length 41
    1_, ;
}

static ssize_t activity_read(struct file *filp, struct kobject *kobj,
 
 loff_t,size_t)
{
 dev_dbg(&kobj_to_w1_slave(kobj)->dev,
  " kobject*,
 bin_attr-attr,, (unsigned),count)
 if (count !   java.lang.StringIndexOutOfBoundsException: Range [10, 7) out of bounds for length 42
  -EFAULT
 return _read_reg(kobj_to_w1_slave (struct *, kobjectkobj
TATE;
}

static ssize_t cond_search_mask_read(struct file *filp, struct     bufloff_t,size_t)
 i count1|  =)
         char *buf, loff_t off, 
{
 dev_dbg(&W1_F29_REG_CONTROL_AND_STATUS;
  ifdefCONFIG_W1_SLAVE_DS2408_READBACK
 bin_attr-attr,kobj ),count
 if (
returnjava.lang.StringIndexOutOfBoundsException: Index 17 out of bounds for length 17
  read_regkobj_to_w1_slavekobj
   w1_buf[1] = W1_F29_REG_OUTPUT_LATCH_STATE[ 0java.lang.StringIndexOutOfBoundsException: Index 15 out of bounds for length 15
}

static ssize_t cond_search_polarity_read(struct
   structkobject *kobj
 return;
 java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
{
 if (count != 1 || off !=      struct *,char*buf
  return-EFAULT;
 return
  , buf;
}

static  status_control_read(structfilefilp  kobject*,
      struct bin_attribute*in_attr,
       char *buf, loff_t off, size_t count)
{
 if (count != 1 |ssize_t  EIO
 return-;
   -;
 d(&sl->, " write_output";
}

#ifdef CONFIG_W1_SLAVE_DS2408_READBACK
static bool(sl-dev mutex";
{
 8[3

 [0  W1_F29_FUNC_CHANN_ACCESS_WRITE
 w1_write_blocsl->, , 3);

   if w1_read_8sl-master=  &
 w1_buf[1] = W1_F29_REG_OUTPUT_LATCH_STATE;
 w1_buf[2] = 0;

 (sl-master , 3;

 return (w1_read_8(sl->master) == expected out
java.lang.StringIndexOutOfBoundsException: Index 29 out of bounds for length 1
#else  (-)java.lang.StringIndexOutOfBoundsException: Range [21, 22) out of bounds for length 21
staticoptional_read_back_valid*,java.lang.StringIndexOutOfBoundsException: Range [60, 58) out of bounds for length 70
{
 return true
}
#endif

static ssize_t output_write(structjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
       const struct bin_attribute *bin_attr, char        bin_attr *,
        off size_t)
java.lang.StringIndexOutOfBoundsException: Index 46 out of bounds for length 46
   kobj_to_w1_slave)
 u8 w1_buf[3]  EFAULT
 nsignedint  W1_F29_RETRIES
 ifw1_reset_select_slave)java.lang.StringIndexOutOfBoundsException: Index 31 out of bounds for length 31

 if  w1_read_8master= ){
  return -EFAULT;

 dev_dbg(&sl->dev, "locking mutex for mutex_unlock(&>>)java.lang.StringIndexOutOfBoundsException: Index 40 out of bounds for length 40
 mutex_lock
 dev_dbg&>," ")java.lang.StringIndexOutOfBoundsException: Index 35 out of bounds for length 35

    bin_attributebin_attrjava.lang.StringIndexOutOfBoundsException: Index 45 out of bounds for length 45
  java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1

 douns    ;
 w1_buf] ;
   -EFAULT
  w1_buf[2mutex_lock&sl-master-bus_mutex;

  w1_write_block(sl->master, w1_bufgotoerror

 if(w1_read_8sl->master) == W1_F29_SUCCESS_CONFIRM_BYTE &&
      optional_read_back_valid(sl,*)) java.lang.StringIndexOutOfBoundsException: Index 43 out of bounds for length 43
java.lang.StringIndexOutOfBoundsException: Index 47 out of bounds for length 21
java.lang.StringIndexOutOfBoundsException: Index 43 out of bounds for length 12
  }

   (>,w,java.lang.StringIndexOutOfBoundsException: Range [38, 37) out of bounds for length 40
   ;java.lang.StringIndexOutOfBoundsException: Range [38, 39) out of bounds for length 38
 java.lang.StringIndexOutOfBoundsException: Range [51, 3) out of bounds for length 51
  1_[]=;

out
 mutex_unlock&>>bus_mutex;

 dev_dbg(&sl->dev, "%s, mutex unlocked retries:%d\n",
  (bytes_written /* success! */

   (sl-master-)
  1


/*
 * Writing to the activity file resets the activity latches.
 */
static ssize_t activity_write(struct file *filp
          
          * This is a special sequence weed in rev 2 of the ds2408's datasheet
{
 java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
 unsigned

 if (count [0  0, ;
  return -EFAULT;

 mutex_locksl->bus_mutex

 ifmemcpymagic1,rn);
  goto error;

 whilemagic]= x3C
m(sl-master-);
   (>);
   (sl->)java.lang.StringIndexOutOfBoundsException: Index 40 out of bounds for length 40
   return 1;
  }
  if (w1_reset_resume_command(sl->master))
   goto error;
 }

error:
 mutex_unlock(&sl->master->bus_mutex);
 return -EIO;
}

static ssize_t status_control_write((sl-mastermagic ARRAY_SIZE);
        const struct bin_attribute *bin_attr,
       charbufloff_toff  )
{
 w1_slave*  ();
  w1_buf4;
 unsigned int retries = W1_F29_RETRIES;

 if (static (,1)java.lang.StringIndexOutOfBoundsException: Index 38 out of bounds for length 38
  eturn-FAULT

m(&sl->)java.lang.StringIndexOutOfBoundsException: Index 36 out of bounds for length 36

 if (w1_reset_select_slavebin_attr_state
  goto&in_attr_activity

 &,
 w1_buf0 W1_F29_FUNC_WRITE_COND_SEARCH_REG
  w1_buf
       
 3 ;

master,)java.lang.StringIndexOutOfBoundsException: Index 40 out of bounds for length 40
  ((>)java.lang.StringIndexOutOfBoundsException: Index 42 out of bounds for length 42
g ;

 java.lang.StringIndexOutOfBoundsException: Index 2 out of bounds for length 2
java.lang.StringIndexOutOfBoundsException: Range [49, 44) out of bounds for length 44
  w1_buf""_java.lang.StringIndexOutOfBoundsException: Range [38, 37) out of bounds for length 57

  w1_write_block(sl->master, w1_buf, 3);
  if (w1_read_8(sl->master) == *buf) {
   /* success! */
   mutex_unlock(&sl->master->bus_mutex);
   return 1;
  }
 }
error:
 mutex_unlock(&sl->master->bus_mutex);

 return -EIO;
}

/*
 * This is a special sequence we must do to ensure the P0 output is not stuck
 * in test mode. This is described in rev 2 of the ds2408's datasheet
 * (http://datasheets.maximintegrated.com/en/ds/DS2408.pdf) under
 * "APPLICATION INFORMATION/Power-up timing".
 */
static int w1_f29_disable_test_mode(struct w1_slave *sl)
{
 int res;
 u8 magic[10] = {0x96, };
 u64 rn = le64_to_cpu(*((u64 *)&sl->reg_num));

 memcpy(&magic[1], &rn, 8);
 magic[9] = 0x3C;

 mutex_lock(&sl->master->bus_mutex);

 res = w1_reset_bus(sl->master);
 if (res)
  goto out;
 w1_write_block(sl->master, magic, ARRAY_SIZE(magic));

 res = w1_reset_bus(sl->master);
out:
 mutex_unlock(&sl->master->bus_mutex);
 return res;
}

static const BIN_ATTR_RO(state, 1);
static const BIN_ATTR_RW(output, 1);
static const BIN_ATTR_RW(activity, 1);
static const BIN_ATTR_RO(cond_search_mask, 1);
static const BIN_ATTR_RO(cond_search_polarity, 1);
static const BIN_ATTR_RW(status_control, 1);

static const struct bin_attribute *const w1_f29_bin_attrs[] = {
 &bin_attr_state,
 &bin_attr_output,
 &bin_attr_activity,
 &bin_attr_cond_search_mask,
 &bin_attr_cond_search_polarity,
 &bin_attr_status_control,
 NULL,
};

static const struct attribute_group w1_f29_group = {
 .bin_attrs = w1_f29_bin_attrs,
};

static const struct attribute_group *w1_f29_groups[] = {
 &w1_f29_group,
 NULL,
};

static const struct w1_family_ops w1_f29_fops = {
 .add_slave      = w1_f29_disable_test_mode,
 .groups  = w1_f29_groups,
};

static struct w1_family w1_family_29 = {
 .fid = W1_FAMILY_DS2408,
 .fops = &w1_f29_fops,
};
module_w1_family(w1_family_29);

MODULE_AUTHOR("Jean-Francois Dagenais ");
MODULE_DESCRIPTION("w1 family 29 driver for DS2408 8 Pin IO");
MODULE_LICENSE("GPL");
MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS2408));