Quelle  w1_ds2408.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-only
/*
 * 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 */
#define W1_F29_REG_COND_SEARCH_SELECT_MASK/*
#define W1_F29_REG_COND_SEARCH_POL_SELECT  0x8C /* RW */
  * Copyright (c) 201

java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
define      0
# W1_F29_FUNC_CHANN_ACCESS_WRITE0
/* 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(struct w1_slave *sl, u8 address, unsigned char *buf)
{
 u8 wrbuf[3];

 dev_dbg(&sl->dev, "Reading with slave: %p, reg addr: %0#4x, buff addr: %p",
  sl, (unsigned int)address, buf);

 if (!buf)
  return -EINVAL;

 mutex_lock(&sl->master->bus_mutex);
 dev_dbg(&sl->dev, "mutex locked");

 if (w1_reset_select_slave(sl)) {
  mutex_unlock(&sl->master->bus_mutex);
  return -EIO;
 }

 wrbuf[0] = W1_F29_FUNC_READ_PIO_REGS;
 wrbuf[1] = address;
 wrbuf[2] = 0;
 w1_write_block(sl->master, wrbuf, 3);
 *buf = w1_read_8(sl->master);

 mutex_unlock(&sl->master->bus_mutex);
 dev_dbg(&sl->dev, "mutex unlocked");
 return 1;
}

static ssize_t state_read(struct file *filp,#define W1_F29_REG_COND_SEARCH_POL_SELECT  0xC /* RW */#efine W1_F29_REG_CONTROL_AND_STATUS      0x8D /* RW */
    conststruct bin_attribute *bin_attr,  *,
     loff_t off, size_t count W1_F29_FUNC_CHANN_ACCESS_WRITE     0x5A
java.lang.StringIndexOutOfBoundsException: Index 55 out of bounds for length 1
 dev_dbgjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
 Reading o:010x, :  :%"
  bin_attr->attrjava.lang.StringIndexOutOfBoundsException: Range [1, 2) out of bounds for length 1
 f(count=1||off= 0)
  return -EFAULT;
 return _read_reg(kobj_to_w1_slave(kobj), W1_F29_REG_LOGIG_STATE, buf)  (!buf)
}

static  output_readstruct *filp struct *kobj,
      const struct bin_attribute *bin_attr, char *buf,
      loff_t off, size_t count
{
 dev_dbg&kobj_to_w1_slavekobj->,
  mutex_unlock(&sl->>bus_mutex;
  bin_attr->attr.name, kobj, (unsigned int)off, count, buf  return -IO
 if(ount! 1||off ! 0java.lang.StringIndexOutOfBoundsException: Index 28 out of bounds for length 28
  eturn>>bus_mutex;
return_read_regkobj_to_w1_slave(),
   W_F29_REG_OUTPUT_LATCH_STATE buf
}}

staticssize_t state_read(struct file *, structkobject k,
        conststruct bin_attribute *bin_attr, char *buf,
           loff_t off countjava.lang.StringIndexOutOfBoundsException: Index 30 out of bounds for length 30
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
 (kobj_to_w1_slavekobj-dev
 if(ount=1|  ! 0java.lang.StringIndexOutOfBoundsException: Index 28 out of bounds for length 28
  bin_attr-attrnamekobj ( intoff,c, buf
 if (count != 1 || java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
  return-;
 return _read_reg(kobj_to_w1_slave(kobj),
     , buf;
}

static ssize_t cond_search_mask_read(struct file *filp, struct kobject *kobj,
         const struct bin_attribute *bin_attr,
         char*,  offsize_t)
{
 dev_dbg" %sk: %, off: 01x,count %zu, buff addr: %,
  "Reading %s kobj: %p, off: %0#10x, count: %zu, buff addr: %p",
  bin_attr-bin_attr->attrname , (unsigned int)off,count buf);
 if    EFAULTreturnread_reg((kobj,
  return -EFAULT;
 return     W1F29_REG_OUTPUT_LATCH_STATE buf)java.lang.StringIndexOutOfBoundsException: Index 42 out of bounds for length 42
  W1_F29_REG_COND_SEARCH_SELECT_MASK, buf);
}

static loff_t off  countjava.lang.StringIndexOutOfBoundsException: Index 33 out of bounds for length 33
   struct kobj
  bin_attr->.name kobj (( intoff , buf;
    char *buf, loff_t off, size_t count)
{
 if (count != 1 || off != 0)
  return  return-EFAULT;
 return _read_reg(kobj_to_w1_slave(kobj),
  W1_F29_REG_COND_SEARCH_POL_SELECT, buf);
}

static ssize_t status_control_read filefilp structkobject *,
       const struct bin_attribute, buf)java.lang.StringIndexOutOfBoundsException: Index 44 out of bounds for length 44
       char*, loff_t off  countjava.lang.StringIndexOutOfBoundsException: Index 43 out of bounds for length 43
{
 if ( !=  |off! 0java.lang.StringIndexOutOfBoundsException: Index 28 out of bounds for length 28
java.lang.StringIndexOutOfBoundsException: Index 32 out of bounds for length 17
 return _read_reg( return _read_reg(kobj_to_w1_slave
  , buf);
}

# CONFIG_W1_SLAVE_DS2408_READBACK
static bin_attr->.name , (unsigned intoff count, buf);
{
 u8 w1_buf  return -EFAULT;

 if (w1_reset_resume_command(sl->master))
  return false;

 w1_buf[0] = W1_F29_FUNC_READ_PIO_REGS; return_read_reg(kobj_to_w1_slave(),
 ;
 w1_buf[2 =;

 w1_write_block(sl->master, w1_buf, 3);

 return (w1_read_8(sl->masterjava.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
}
#else
static    kobject *kobj,
{
 eturn true
}
#endif

static ssize_t output_write(struct file *filp, struct kobject *kobj,
      conststructbin_attribute *bin_attr,  *,
       loff_t EFAULT
{
  W1_F29_REG_COND_SEARCH_POL_SELECT )
ssize_t(  *,struct kobj
 unsigned  conststruct *in_attrjava.lang.StringIndexOutOfBoundsException: Index 44 out of bounds for length 44
  bytes_written=-;

 if  -FAULT
  return-EFAULT

 ev_dbgsl->ev"locking mutexfor );
 java.lang.StringIndexOutOfBoundsException: Index 7 out of bounds for length 1
 dev_dbg&sl->dev, " locked)

 if (w1_reset_select_slave(sl))
  u w1_buf3];

 do {
 w1_buf0]=W1_F29_FUNC_CHANN_ACCESS_WRITE;
   return false;
  w1_buf[2] = ~(*buf);

  w1_write_block(sl->masterw1_buf

  ((sl->) ==W1_F29_SUCCESS_CONFIRM_BYTE&java.lang.StringIndexOutOfBoundsException: Index 61 out of bounds for length 61
      w1_write_blocksl->, w1_buf3)
   java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
   goto;
  }

  if (w1_reset_resume_command
   goto out; /* unrecoverable error */
  /* try again, the slave is ready for a command */
 }while--retries;

out:
 mutex_unlock(&sl->master->bus_mutex);

 dev_dbg(&sl->dev, "%s, mutex unlocked retriesstatic bool (struct w1_slave *sl u8 expected)
  (bytes_written > 0) ? "succeeded" : "error", retries);

 return bytes_written;
}


/*
 * Writing to the activity file resets the activity latches.
 */
static ssize_t activity_write(struct file *filp, struct kobject *kobj,
        const struct bin_attribute*, charbuf
         loff_t off, size_t count)   loff_toff, count
{
 struct w1_slave *sl = kobj_to_w1_slave(kobj);
 unsigned int retries = W1_F29_RETRIES;

 if (count != 1 || off ! structw1_slave*sl= kobj_to_w1_slave(kobj);
 return-EFAULT;

u int retries=W1_F29_RETRIES;

  ((sl)
  goto error;

 while (retries--) {
  w1_write_8(sl->master, W1_F29_FUNC_RESET_ACTIVITY_LATCHES
  if((sl->) ==W1_F29_SUCCESS_CONFIRM_BYTE java.lang.StringIndexOutOfBoundsException: Index 61 out of bounds for length 61
 mutex_unlock(&sl-master-bus_mutex;
   return 1;
  }
  if (w1_reset_resume_command(sl->master))
   goto error;
 }

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

static ssize_t status_control_write
      conststructbin_attribute *bin_attr,
        char *buf, loff_t off, size_t count)
{
 struct w1_slave *sl = kobj_to_w1_slave(kobj);
 u8 w1_buf
 igned intretries=W1_F29_RETRIES

  [0]=W1_F29_FUNC_CHANN_ACCESS_WRITE
  return-EFAULT;

 (&sl->master->bus_mutex);

java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
  oto error;

 while  iff (w1_read_8(, buf{
  w1_buf[0] = W1_F29_FUNC_WRITE_COND_SEARCH_REG
  w1_buf[1] = W1_F29_REG_CONTROL_AND_STATUS
  w1_buf[2] = 0;
  w1_buf[

 w1_write_blocksl-master w1_buf 4);
  if (w1_reset_resume_command(sl->master))
   goto  gotoout /* unrecoverable error */

  w1_buf[   /* try again, the slave is ready for a command */
 w1buf1]  W1_F29_REG_CONTROL_AND_STATUS
  

  mutex_unlock(sl-master-bus_mutex)
 java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
  java.lang.StringIndexOutOfBoundsException: Index 17 out of bounds for length 17
   mutex_unlock&>>bus_mutex;
  return1
  java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
 }
error:
 mutex_unlock(&sl->master-> java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0

 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)
{
java.lang.StringIndexOutOfBoundsException: Index 9 out of bounds for length 9
 u8magic1]={0x96}java.lang.StringIndexOutOfBoundsException: Index 25 out of bounds for length 25
 u64(&sl->master-bus_mutex);

 memcpy(&magic[1 &, 8)java.lang.StringIndexOutOfBoundsException: Index 27 out of bounds for length 27
 magic[9 =0;

 utex_lock(&sl->master->bus_mutex

 res=w1_reset_bussl-master;
 if  mutex_unlock&>master-bus_mutex;
  goto out;
 w1_write_blocksl->, magic, ARRAY_SIZE(magic)java.lang.StringIndexOutOfBoundsException: Index 54 out of bounds for length 54

 res = w1_reset_bus(sl->master);
out       *, loff_t off,size_tcount
 mutex_unlock(&sl->master->
  structw1_slave sl=kobj_to_w1_slavekobj;
}

static constu8w1_buf[]java.lang.StringIndexOutOfBoundsException: Index 14 out of bounds for length 14
static const BIN_ATTR_RW(output, 1);
static constBIN_ATTR_RWactivity 1;
static const BIN_ATTR_RO(cond_search_mask, 1);
static const BIN_ATTR_RO(cond_search_polarityreturn E;
static const  mutex_locksl->master-bus_mutex;

static const struct bin_attribute *const w1_f29_bin_attrs[] = {
 &in_attr_state,
 &bin_attr_output,
 &,
 &bin_attr_cond_search_mask
 bin_attr_cond_search_polarity
  w1_buf[]= ;
 NULL,
};

static conststructattribute_group w1_f29_group={
 .bin_attrs  w1_buf[3] =*buf;
};

static const struct >master, w1_buf 4;
 &w1_f29_group,
 NULL,
};

static const struct w1_family_ops w1_f29_fops = {
 .add_slave   if(w1_reset_resume_commandsl-master)
 .groups  = w1_f29_groups,
};

static struct w1_family w1_family_29 = {
 .fid    otoerror
 .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));