forked from Minki/linux
[PATCH] W1: Add the DS2482 I2C-to-w1 bridge driver.
Signed-off-by: Ben Gardner <bgardner@wabtec.com> Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Evgeniy Polyakov
Greg Kroah-Hartman
parent
bd529cfb40
commit
baf12ae29a
31
Documentation/w1/masters/ds2482
Normal file
31
Documentation/w1/masters/ds2482
Normal file
@ -0,0 +1,31 @@
|
||||
Kernel driver ds2482
|
||||
====================
|
||||
|
||||
Supported chips:
|
||||
* Maxim DS2482-100, Maxim DS2482-800
|
||||
Prefix: 'ds2482'
|
||||
Addresses scanned: None
|
||||
Datasheets:
|
||||
http://pdfserv.maxim-ic.com/en/ds/DS2482-100-DS2482S-100.pdf
|
||||
http://pdfserv.maxim-ic.com/en/ds/DS2482-800-DS2482S-800.pdf
|
||||
|
||||
Author: Ben Gardner <bgardner@wabtec.com>
|
||||
|
||||
|
||||
Description
|
||||
-----------
|
||||
|
||||
The Maixm/Dallas Semiconductor DS2482 is a I2C device that provides
|
||||
one (DS2482-100) or eight (DS2482-800) 1-wire busses.
|
||||
|
||||
|
||||
General Remarks
|
||||
---------------
|
||||
|
||||
Valid addresses are 0x18, 0x19, 0x1a, and 0x1b.
|
||||
However, the device cannot be detected without writing to the i2c bus, so no
|
||||
detection is done.
|
||||
You should force the device address.
|
||||
|
||||
$ modprobe ds2482 force=0,0x18
|
||||
|
||||
@ -34,5 +34,15 @@ config W1_MASTER_DS9490_BRIDGE
|
||||
This support is also available as a module. If so, the module
|
||||
will be called ds_w1_bridge.ko.
|
||||
|
||||
config W1_MASTER_DS2482
|
||||
tristate "Maxim DS2482 I2C to 1-Wire bridge"
|
||||
depends on I2C && W1 && EXPERIMENTAL
|
||||
help
|
||||
If you say yes here you get support for the Maxim DS2482
|
||||
I2C to 1-Wire bridge.
|
||||
|
||||
This driver can also be built as a module. If so, the module
|
||||
will be called ds2482.
|
||||
|
||||
endmenu
|
||||
|
||||
|
||||
@ -9,3 +9,5 @@ ds9490r-objs := dscore.o
|
||||
|
||||
obj-$(CONFIG_W1_MASTER_DS9490_BRIDGE) += ds_w1_bridge.o
|
||||
|
||||
obj-$(CONFIG_W1_MASTER_DS2482) += ds2482.o
|
||||
|
||||
|
||||
564
drivers/w1/masters/ds2482.c
Normal file
564
drivers/w1/masters/ds2482.c
Normal file
@ -0,0 +1,564 @@
|
||||
/**
|
||||
* ds2482.c - provides i2c to w1-master bridge(s)
|
||||
* Copyright (C) 2005 Ben Gardner <bgardner@wabtec.com>
|
||||
*
|
||||
* The DS2482 is a sensor chip made by Dallas Semiconductor (Maxim).
|
||||
* It is a I2C to 1-wire bridge.
|
||||
* There are two variations: -100 and -800, which have 1 or 8 1-wire ports.
|
||||
* The complete datasheet can be obtained from MAXIM's website at:
|
||||
* http://www.maxim-ic.com/quick_view2.cfm/qv_pk/4382
|
||||
*
|
||||
* 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/module.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/i2c.h>
|
||||
#include <linux/delay.h>
|
||||
#include <asm/delay.h>
|
||||
|
||||
#include "../w1.h"
|
||||
#include "../w1_int.h"
|
||||
|
||||
/**
|
||||
* Address is selected using 2 pins, resulting in 4 possible addresses.
|
||||
* 0x18, 0x19, 0x1a, 0x1b
|
||||
* However, the chip cannot be detected without doing an i2c write,
|
||||
* so use the force module parameter.
|
||||
*/
|
||||
static unsigned short normal_i2c[] = {I2C_CLIENT_END};
|
||||
|
||||
/**
|
||||
* Insmod parameters
|
||||
*/
|
||||
I2C_CLIENT_INSMOD_1(ds2482);
|
||||
|
||||
/**
|
||||
* The DS2482 registers - there are 3 registers that are addressed by a read
|
||||
* pointer. The read pointer is set by the last command executed.
|
||||
*
|
||||
* To read the data, issue a register read for any address
|
||||
*/
|
||||
#define DS2482_CMD_RESET 0xF0 /* No param */
|
||||
#define DS2482_CMD_SET_READ_PTR 0xE1 /* Param: DS2482_PTR_CODE_xxx */
|
||||
#define DS2482_CMD_CHANNEL_SELECT 0xC3 /* Param: Channel byte - DS2482-800 only */
|
||||
#define DS2482_CMD_WRITE_CONFIG 0xD2 /* Param: Config byte */
|
||||
#define DS2482_CMD_1WIRE_RESET 0xB4 /* Param: None */
|
||||
#define DS2482_CMD_1WIRE_SINGLE_BIT 0x87 /* Param: Bit byte (bit7) */
|
||||
#define DS2482_CMD_1WIRE_WRITE_BYTE 0xA5 /* Param: Data byte */
|
||||
#define DS2482_CMD_1WIRE_READ_BYTE 0x96 /* Param: None */
|
||||
/* Note to read the byte, Set the ReadPtr to Data then read (any addr) */
|
||||
#define DS2482_CMD_1WIRE_TRIPLET 0x78 /* Param: Dir byte (bit7) */
|
||||
|
||||
/* Values for DS2482_CMD_SET_READ_PTR */
|
||||
#define DS2482_PTR_CODE_STATUS 0xF0
|
||||
#define DS2482_PTR_CODE_DATA 0xE1
|
||||
#define DS2482_PTR_CODE_CHANNEL 0xD2 /* DS2482-800 only */
|
||||
#define DS2482_PTR_CODE_CONFIG 0xC3
|
||||
|
||||
/**
|
||||
* Configure Register bit definitions
|
||||
* The top 4 bits always read 0.
|
||||
* To write, the top nibble must be the 1's compl. of the low nibble.
|
||||
*/
|
||||
#define DS2482_REG_CFG_1WS 0x08
|
||||
#define DS2482_REG_CFG_SPU 0x04
|
||||
#define DS2482_REG_CFG_PPM 0x02
|
||||
#define DS2482_REG_CFG_APU 0x01
|
||||
|
||||
|
||||
/**
|
||||
* Write and verify codes for the CHANNEL_SELECT command (DS2482-800 only).
|
||||
* To set the channel, write the value at the index of the channel.
|
||||
* Read and compare against the corresponding value to verify the change.
|
||||
*/
|
||||
static const u8 ds2482_chan_wr[8] =
|
||||
{ 0xF0, 0xE1, 0xD2, 0xC3, 0xB4, 0xA5, 0x96, 0x87 };
|
||||
static const u8 ds2482_chan_rd[8] =
|
||||
{ 0xB8, 0xB1, 0xAA, 0xA3, 0x9C, 0x95, 0x8E, 0x87 };
|
||||
|
||||
|
||||
/**
|
||||
* Status Register bit definitions (read only)
|
||||
*/
|
||||
#define DS2482_REG_STS_DIR 0x80
|
||||
#define DS2482_REG_STS_TSB 0x40
|
||||
#define DS2482_REG_STS_SBR 0x20
|
||||
#define DS2482_REG_STS_RST 0x10
|
||||
#define DS2482_REG_STS_LL 0x08
|
||||
#define DS2482_REG_STS_SD 0x04
|
||||
#define DS2482_REG_STS_PPD 0x02
|
||||
#define DS2482_REG_STS_1WB 0x01
|
||||
|
||||
|
||||
static int ds2482_attach_adapter(struct i2c_adapter *adapter);
|
||||
static int ds2482_detect(struct i2c_adapter *adapter, int address, int kind);
|
||||
static int ds2482_detach_client(struct i2c_client *client);
|
||||
|
||||
|
||||
/**
|
||||
* Driver data (common to all clients)
|
||||
*/
|
||||
static struct i2c_driver ds2482_driver = {
|
||||
.driver = {
|
||||
.owner = THIS_MODULE,
|
||||
.name = "ds2482",
|
||||
},
|
||||
.attach_adapter = ds2482_attach_adapter,
|
||||
.detach_client = ds2482_detach_client,
|
||||
};
|
||||
|
||||
/*
|
||||
* Client data (each client gets its own)
|
||||
*/
|
||||
|
||||
struct ds2482_data;
|
||||
|
||||
struct ds2482_w1_chan {
|
||||
struct ds2482_data *pdev;
|
||||
u8 channel;
|
||||
struct w1_bus_master w1_bm;
|
||||
};
|
||||
|
||||
struct ds2482_data {
|
||||
struct i2c_client client;
|
||||
struct semaphore access_lock;
|
||||
|
||||
/* 1-wire interface(s) */
|
||||
int w1_count; /* 1 or 8 */
|
||||
struct ds2482_w1_chan w1_ch[8];
|
||||
|
||||
/* per-device values */
|
||||
u8 channel;
|
||||
u8 read_prt; /* see DS2482_PTR_CODE_xxx */
|
||||
u8 reg_config;
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* Sets the read pointer.
|
||||
* @param pdev The ds2482 client pointer
|
||||
* @param read_ptr see DS2482_PTR_CODE_xxx above
|
||||
* @return -1 on failure, 0 on success
|
||||
*/
|
||||
static inline int ds2482_select_register(struct ds2482_data *pdev, u8 read_ptr)
|
||||
{
|
||||
if (pdev->read_prt != read_ptr) {
|
||||
if (i2c_smbus_write_byte_data(&pdev->client,
|
||||
DS2482_CMD_SET_READ_PTR,
|
||||
read_ptr) < 0)
|
||||
return -1;
|
||||
|
||||
pdev->read_prt = read_ptr;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* Sends a command without a parameter
|
||||
* @param pdev The ds2482 client pointer
|
||||
* @param cmd DS2482_CMD_RESET,
|
||||
* DS2482_CMD_1WIRE_RESET,
|
||||
* DS2482_CMD_1WIRE_READ_BYTE
|
||||
* @return -1 on failure, 0 on success
|
||||
*/
|
||||
static inline int ds2482_send_cmd(struct ds2482_data *pdev, u8 cmd)
|
||||
{
|
||||
if (i2c_smbus_write_byte(&pdev->client, cmd) < 0)
|
||||
return -1;
|
||||
|
||||
pdev->read_prt = DS2482_PTR_CODE_STATUS;
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* Sends a command with a parameter
|
||||
* @param pdev The ds2482 client pointer
|
||||
* @param cmd DS2482_CMD_WRITE_CONFIG,
|
||||
* DS2482_CMD_1WIRE_SINGLE_BIT,
|
||||
* DS2482_CMD_1WIRE_WRITE_BYTE,
|
||||
* DS2482_CMD_1WIRE_TRIPLET
|
||||
* @param byte The data to send
|
||||
* @return -1 on failure, 0 on success
|
||||
*/
|
||||
static inline int ds2482_send_cmd_data(struct ds2482_data *pdev,
|
||||
u8 cmd, u8 byte)
|
||||
{
|
||||
if (i2c_smbus_write_byte_data(&pdev->client, cmd, byte) < 0)
|
||||
return -1;
|
||||
|
||||
/* all cmds leave in STATUS, except CONFIG */
|
||||
pdev->read_prt = (cmd != DS2482_CMD_WRITE_CONFIG) ?
|
||||
DS2482_PTR_CODE_STATUS : DS2482_PTR_CODE_CONFIG;
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* 1-Wire interface code
|
||||
*/
|
||||
|
||||
#define DS2482_WAIT_IDLE_TIMEOUT 100
|
||||
|
||||
/**
|
||||
* Waits until the 1-wire interface is idle (not busy)
|
||||
*
|
||||
* @param pdev Pointer to the device structure
|
||||
* @return the last value read from status or -1 (failure)
|
||||
*/
|
||||
static int ds2482_wait_1wire_idle(struct ds2482_data *pdev)
|
||||
{
|
||||
int temp = -1;
|
||||
int retries = 0;
|
||||
|
||||
if (!ds2482_select_register(pdev, DS2482_PTR_CODE_STATUS)) {
|
||||
do {
|
||||
temp = i2c_smbus_read_byte(&pdev->client);
|
||||
} while ((temp >= 0) && (temp & DS2482_REG_STS_1WB) &&
|
||||
(++retries > DS2482_WAIT_IDLE_TIMEOUT));
|
||||
}
|
||||
|
||||
if (retries > DS2482_WAIT_IDLE_TIMEOUT)
|
||||
printk(KERN_ERR "%s: timeout on channel %d\n",
|
||||
__func__, pdev->channel);
|
||||
|
||||
return temp;
|
||||
}
|
||||
|
||||
/**
|
||||
* Selects a w1 channel.
|
||||
* The 1-wire interface must be idle before calling this function.
|
||||
*
|
||||
* @param pdev The ds2482 client pointer
|
||||
* @param channel 0-7
|
||||
* @return -1 (failure) or 0 (success)
|
||||
*/
|
||||
static int ds2482_set_channel(struct ds2482_data *pdev, u8 channel)
|
||||
{
|
||||
if (i2c_smbus_write_byte_data(&pdev->client, DS2482_CMD_CHANNEL_SELECT,
|
||||
ds2482_chan_wr[channel]) < 0)
|
||||
return -1;
|
||||
|
||||
pdev->read_prt = DS2482_PTR_CODE_CHANNEL;
|
||||
pdev->channel = -1;
|
||||
if (i2c_smbus_read_byte(&pdev->client) == ds2482_chan_rd[channel]) {
|
||||
pdev->channel = channel;
|
||||
return 0;
|
||||
}
|
||||
return -1;
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* Performs the touch-bit function, which writes a 0 or 1 and reads the level.
|
||||
*
|
||||
* @param data The ds2482 channel pointer
|
||||
* @param bit The level to write: 0 or non-zero
|
||||
* @return The level read: 0 or 1
|
||||
*/
|
||||
static u8 ds2482_w1_touch_bit(void *data, u8 bit)
|
||||
{
|
||||
struct ds2482_w1_chan *pchan = data;
|
||||
struct ds2482_data *pdev = pchan->pdev;
|
||||
int status = -1;
|
||||
|
||||
down(&pdev->access_lock);
|
||||
|
||||
/* Select the channel */
|
||||
ds2482_wait_1wire_idle(pdev);
|
||||
if (pdev->w1_count > 1)
|
||||
ds2482_set_channel(pdev, pchan->channel);
|
||||
|
||||
/* Send the touch command, wait until 1WB == 0, return the status */
|
||||
if (!ds2482_send_cmd_data(pdev, DS2482_CMD_1WIRE_SINGLE_BIT,
|
||||
bit ? 0xFF : 0))
|
||||
status = ds2482_wait_1wire_idle(pdev);
|
||||
|
||||
up(&pdev->access_lock);
|
||||
|
||||
return (status & DS2482_REG_STS_SBR) ? 1 : 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* Performs the triplet function, which reads two bits and writes a bit.
|
||||
* The bit written is determined by the two reads:
|
||||
* 00 => dbit, 01 => 0, 10 => 1
|
||||
*
|
||||
* @param data The ds2482 channel pointer
|
||||
* @param dbit The direction to choose if both branches are valid
|
||||
* @return b0=read1 b1=read2 b3=bit written
|
||||
*/
|
||||
static u8 ds2482_w1_triplet(void *data, u8 dbit)
|
||||
{
|
||||
struct ds2482_w1_chan *pchan = data;
|
||||
struct ds2482_data *pdev = pchan->pdev;
|
||||
int status = (3 << 5);
|
||||
|
||||
down(&pdev->access_lock);
|
||||
|
||||
/* Select the channel */
|
||||
ds2482_wait_1wire_idle(pdev);
|
||||
if (pdev->w1_count > 1)
|
||||
ds2482_set_channel(pdev, pchan->channel);
|
||||
|
||||
/* Send the triplet command, wait until 1WB == 0, return the status */
|
||||
if (!ds2482_send_cmd_data(pdev, DS2482_CMD_1WIRE_TRIPLET,
|
||||
dbit ? 0xFF : 0))
|
||||
status = ds2482_wait_1wire_idle(pdev);
|
||||
|
||||
up(&pdev->access_lock);
|
||||
|
||||
/* Decode the status */
|
||||
return (status >> 5);
|
||||
}
|
||||
|
||||
/**
|
||||
* Performs the write byte function.
|
||||
*
|
||||
* @param data The ds2482 channel pointer
|
||||
* @param byte The value to write
|
||||
*/
|
||||
static void ds2482_w1_write_byte(void *data, u8 byte)
|
||||
{
|
||||
struct ds2482_w1_chan *pchan = data;
|
||||
struct ds2482_data *pdev = pchan->pdev;
|
||||
|
||||
down(&pdev->access_lock);
|
||||
|
||||
/* Select the channel */
|
||||
ds2482_wait_1wire_idle(pdev);
|
||||
if (pdev->w1_count > 1)
|
||||
ds2482_set_channel(pdev, pchan->channel);
|
||||
|
||||
/* Send the write byte command */
|
||||
ds2482_send_cmd_data(pdev, DS2482_CMD_1WIRE_WRITE_BYTE, byte);
|
||||
|
||||
up(&pdev->access_lock);
|
||||
}
|
||||
|
||||
/**
|
||||
* Performs the read byte function.
|
||||
*
|
||||
* @param data The ds2482 channel pointer
|
||||
* @return The value read
|
||||
*/
|
||||
static u8 ds2482_w1_read_byte(void *data)
|
||||
{
|
||||
struct ds2482_w1_chan *pchan = data;
|
||||
struct ds2482_data *pdev = pchan->pdev;
|
||||
int result;
|
||||
|
||||
down(&pdev->access_lock);
|
||||
|
||||
/* Select the channel */
|
||||
ds2482_wait_1wire_idle(pdev);
|
||||
if (pdev->w1_count > 1)
|
||||
ds2482_set_channel(pdev, pchan->channel);
|
||||
|
||||
/* Send the read byte command */
|
||||
ds2482_send_cmd(pdev, DS2482_CMD_1WIRE_READ_BYTE);
|
||||
|
||||
/* Wait until 1WB == 0 */
|
||||
ds2482_wait_1wire_idle(pdev);
|
||||
|
||||
/* Select the data register */
|
||||
ds2482_select_register(pdev, DS2482_PTR_CODE_DATA);
|
||||
|
||||
/* Read the data byte */
|
||||
result = i2c_smbus_read_byte(&pdev->client);
|
||||
|
||||
up(&pdev->access_lock);
|
||||
|
||||
return result;
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* Sends a reset on the 1-wire interface
|
||||
*
|
||||
* @param data The ds2482 channel pointer
|
||||
* @return 0=Device present, 1=No device present or error
|
||||
*/
|
||||
static u8 ds2482_w1_reset_bus(void *data)
|
||||
{
|
||||
struct ds2482_w1_chan *pchan = data;
|
||||
struct ds2482_data *pdev = pchan->pdev;
|
||||
int err;
|
||||
u8 retval = 1;
|
||||
|
||||
down(&pdev->access_lock);
|
||||
|
||||
/* Select the channel */
|
||||
ds2482_wait_1wire_idle(pdev);
|
||||
if (pdev->w1_count > 1)
|
||||
ds2482_set_channel(pdev, pchan->channel);
|
||||
|
||||
/* Send the reset command */
|
||||
err = ds2482_send_cmd(pdev, DS2482_CMD_1WIRE_RESET);
|
||||
if (err >= 0) {
|
||||
/* Wait until the reset is complete */
|
||||
err = ds2482_wait_1wire_idle(pdev);
|
||||
retval = !(err & DS2482_REG_STS_PPD);
|
||||
|
||||
/* If the chip did reset since detect, re-config it */
|
||||
if (err & DS2482_REG_STS_RST)
|
||||
ds2482_send_cmd_data(pdev, DS2482_CMD_WRITE_CONFIG,
|
||||
0xF0);
|
||||
}
|
||||
|
||||
up(&pdev->access_lock);
|
||||
|
||||
return retval;
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* Called to see if the device exists on an i2c bus.
|
||||
*/
|
||||
static int ds2482_attach_adapter(struct i2c_adapter *adapter)
|
||||
{
|
||||
return i2c_probe(adapter, &addr_data, ds2482_detect);
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* The following function does more than just detection. If detection
|
||||
* succeeds, it also registers the new chip.
|
||||
*/
|
||||
static int ds2482_detect(struct i2c_adapter *adapter, int address, int kind)
|
||||
{
|
||||
struct ds2482_data *data;
|
||||
struct i2c_client *new_client;
|
||||
int err = 0;
|
||||
int temp1;
|
||||
int idx;
|
||||
|
||||
if (!i2c_check_functionality(adapter,
|
||||
I2C_FUNC_SMBUS_WRITE_BYTE_DATA |
|
||||
I2C_FUNC_SMBUS_BYTE))
|
||||
goto exit;
|
||||
|
||||
if (!(data = kzalloc(sizeof(struct ds2482_data), GFP_KERNEL))) {
|
||||
err = -ENOMEM;
|
||||
goto exit;
|
||||
}
|
||||
|
||||
new_client = &data->client;
|
||||
i2c_set_clientdata(new_client, data);
|
||||
new_client->addr = address;
|
||||
new_client->driver = &ds2482_driver;
|
||||
new_client->adapter = adapter;
|
||||
|
||||
/* Reset the device (sets the read_ptr to status) */
|
||||
if (ds2482_send_cmd(data, DS2482_CMD_RESET) < 0) {
|
||||
dev_dbg(&adapter->dev, "DS2482 reset failed at 0x%02x.\n",
|
||||
address);
|
||||
goto exit_free;
|
||||
}
|
||||
|
||||
/* Sleep at least 525ns to allow the reset to complete */
|
||||
ndelay(525);
|
||||
|
||||
/* Read the status byte - only reset bit and line should be set */
|
||||
temp1 = i2c_smbus_read_byte(new_client);
|
||||
if (temp1 != (DS2482_REG_STS_LL | DS2482_REG_STS_RST)) {
|
||||
dev_dbg(&adapter->dev, "DS2482 (0x%02x) reset status "
|
||||
"0x%02X - not a DS2482\n", address, temp1);
|
||||
goto exit_free;
|
||||
}
|
||||
|
||||
/* Detect the 8-port version */
|
||||
data->w1_count = 1;
|
||||
if (ds2482_set_channel(data, 7) == 0)
|
||||
data->w1_count = 8;
|
||||
|
||||
/* Set all config items to 0 (off) */
|
||||
ds2482_send_cmd_data(data, DS2482_CMD_WRITE_CONFIG, 0xF0);
|
||||
|
||||
/* We can fill in the remaining client fields */
|
||||
snprintf(new_client->name, sizeof(new_client->name), "ds2482-%d00",
|
||||
data->w1_count);
|
||||
|
||||
init_MUTEX(&data->access_lock);
|
||||
|
||||
/* Tell the I2C layer a new client has arrived */
|
||||
if ((err = i2c_attach_client(new_client)))
|
||||
goto exit_free;
|
||||
|
||||
/* Register 1-wire interface(s) */
|
||||
for (idx = 0; idx < data->w1_count; idx++) {
|
||||
data->w1_ch[idx].pdev = data;
|
||||
data->w1_ch[idx].channel = idx;
|
||||
|
||||
/* Populate all the w1 bus master stuff */
|
||||
data->w1_ch[idx].w1_bm.data = &data->w1_ch[idx];
|
||||
data->w1_ch[idx].w1_bm.read_byte = ds2482_w1_read_byte;
|
||||
data->w1_ch[idx].w1_bm.write_byte = ds2482_w1_write_byte;
|
||||
data->w1_ch[idx].w1_bm.touch_bit = ds2482_w1_touch_bit;
|
||||
data->w1_ch[idx].w1_bm.triplet = ds2482_w1_triplet;
|
||||
data->w1_ch[idx].w1_bm.reset_bus = ds2482_w1_reset_bus;
|
||||
|
||||
err = w1_add_master_device(&data->w1_ch[idx].w1_bm);
|
||||
if (err) {
|
||||
data->w1_ch[idx].pdev = NULL;
|
||||
goto exit_w1_remove;
|
||||
}
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
||||
exit_w1_remove:
|
||||
i2c_detach_client(new_client);
|
||||
|
||||
for (idx = 0; idx < data->w1_count; idx++) {
|
||||
if (data->w1_ch[idx].pdev != NULL)
|
||||
w1_remove_master_device(&data->w1_ch[idx].w1_bm);
|
||||
}
|
||||
exit_free:
|
||||
kfree(data);
|
||||
exit:
|
||||
return err;
|
||||
}
|
||||
|
||||
static int ds2482_detach_client(struct i2c_client *client)
|
||||
{
|
||||
struct ds2482_data *data = i2c_get_clientdata(client);
|
||||
int err, idx;
|
||||
|
||||
/* Unregister the 1-wire bridge(s) */
|
||||
for (idx = 0; idx < data->w1_count; idx++) {
|
||||
if (data->w1_ch[idx].pdev != NULL)
|
||||
w1_remove_master_device(&data->w1_ch[idx].w1_bm);
|
||||
}
|
||||
|
||||
/* Detach the i2c device */
|
||||
if ((err = i2c_detach_client(client))) {
|
||||
dev_err(&client->dev,
|
||||
"Deregistration failed, client not detached.\n");
|
||||
return err;
|
||||
}
|
||||
|
||||
/* Free the memory */
|
||||
kfree(data);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int __init sensors_ds2482_init(void)
|
||||
{
|
||||
return i2c_add_driver(&ds2482_driver);
|
||||
}
|
||||
|
||||
static void __exit sensors_ds2482_exit(void)
|
||||
{
|
||||
i2c_del_driver(&ds2482_driver);
|
||||
}
|
||||
|
||||
MODULE_AUTHOR("Ben Gardner <bgardner@wabtec.com>");
|
||||
MODULE_DESCRIPTION("DS2482 driver");
|
||||
MODULE_LICENSE("GPL");
|
||||
|
||||
module_init(sensors_ds2482_init);
|
||||
module_exit(sensors_ds2482_exit);
|
||||
Loading…
Reference in New Issue
Block a user