Commit 663cc813 authored by Linus Torvalds's avatar Linus Torvalds

Merge branch 'i2c-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging

* 'i2c-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging:
  macintosh: Don't assume i2c device probing always succeeds
  i2c: Hide probe errors caused by ACPI resource conflicts
  i2c: Minor documentation update
  mfd: AB3100 drop unused module parameters
  Staging: IIO: tsl2561: Drop unused module parameters
  leds: leds-pca9532 - Drop unused module parameters
  ltc4215/ltc4245: Discard obsolete detect methods
  ds2482: Discard obsolete detect method
  max6875: Discard obsolete detect method
  i2c: Move misc devices documentation
parents 58e57fbd 6f6b35e1
......@@ -22,12 +22,13 @@ Usage Notes
-----------
This driver does not probe for LTC4215 devices, due to the fact that some
of the possible addresses are unfriendly to probing. You will need to use
the "force" parameter to tell the driver where to find the device.
of the possible addresses are unfriendly to probing. You will have to
instantiate the devices explicitly.
Example: the following will load the driver for an LTC4215 at address 0x44
on I2C bus #0:
$ modprobe ltc4215 force=0,0x44
$ modprobe ltc4215
$ echo ltc4215 0x44 > /sys/bus/i2c/devices/i2c-0/new_device
Sysfs entries
......
......@@ -23,12 +23,13 @@ Usage Notes
-----------
This driver does not probe for LTC4245 devices, due to the fact that some
of the possible addresses are unfriendly to probing. You will need to use
the "force" parameter to tell the driver where to find the device.
of the possible addresses are unfriendly to probing. You will have to
instantiate the devices explicitly.
Example: the following will load the driver for an LTC4245 at address 0x23
on I2C bus #1:
$ modprobe ltc4245 force=1,0x23
$ modprobe ltc4245
$ echo ltc4245 0x23 > /sys/bus/i2c/devices/i2c-1/new_device
Sysfs entries
......
......@@ -188,7 +188,7 @@ segment, the address is sufficient to uniquely identify the device to be
deleted.
Example:
# echo eeprom 0x50 > /sys/class/i2c-adapter/i2c-3/new_device
# echo eeprom 0x50 > /sys/bus/i2c/devices/i2c-3/new_device
While this interface should only be used when in-kernel device declaration
can't be done, there is a variety of cases where it can be helpful:
......
......@@ -42,10 +42,12 @@ General Remarks
Valid addresses for the MAX6875 are 0x50 and 0x52.
Valid addresses for the MAX6874 are 0x50, 0x52, 0x54 and 0x56.
The driver does not probe any address, so you must force the address.
The driver does not probe any address, so you explicitly instantiate the
devices.
Example:
$ modprobe max6875 force=0,0x50
$ modprobe max6875
$ echo max6875 0x50 > /sys/bus/i2c/devices/i2c-0/new_device
The MAX6874/MAX6875 ignores address bit 0, so this driver attaches to multiple
addresses. For example, for address 0x50, it also reserves 0x51.
......
......@@ -24,8 +24,8 @@ 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.
detection is done. You should instantiate the device explicitly.
$ modprobe ds2482 force=0,0x18
$ modprobe ds2482
$ echo ds2482 0x18 > /sys/bus/i2c/devices/i2c-0/new_device
......@@ -20,11 +20,6 @@
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
static const unsigned short normal_i2c[] = { I2C_CLIENT_END };
/* Insmod parameters */
I2C_CLIENT_INSMOD_1(ltc4215);
/* Here are names of the chip's registers (a.k.a. commands) */
enum ltc4215_cmd {
LTC4215_CONTROL = 0x00, /* rw */
......@@ -246,9 +241,13 @@ static const struct attribute_group ltc4215_group = {
static int ltc4215_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct i2c_adapter *adapter = client->adapter;
struct ltc4215_data *data;
int ret;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
return -ENODEV;
data = kzalloc(sizeof(*data), GFP_KERNEL);
if (!data) {
ret = -ENOMEM;
......@@ -294,56 +293,20 @@ static int ltc4215_remove(struct i2c_client *client)
return 0;
}
static int ltc4215_detect(struct i2c_client *client,
int kind,
struct i2c_board_info *info)
{
struct i2c_adapter *adapter = client->adapter;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
return -ENODEV;
if (kind < 0) { /* probed detection - check the chip type */
s32 v; /* 8 bits from the chip, or -ERRNO */
/*
* Register 0x01 bit b7 is reserved, expect 0
* Register 0x03 bit b6 and b7 are reserved, expect 0
*/
v = i2c_smbus_read_byte_data(client, LTC4215_ALERT);
if (v < 0 || (v & (1 << 7)) != 0)
return -ENODEV;
v = i2c_smbus_read_byte_data(client, LTC4215_FAULT);
if (v < 0 || (v & ((1 << 6) | (1 << 7))) != 0)
return -ENODEV;
}
strlcpy(info->type, "ltc4215", I2C_NAME_SIZE);
dev_info(&adapter->dev, "ltc4215 %s at address 0x%02x\n",
kind < 0 ? "probed" : "forced",
client->addr);
return 0;
}
static const struct i2c_device_id ltc4215_id[] = {
{ "ltc4215", ltc4215 },
{ "ltc4215", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, ltc4215_id);
/* This is the driver that will be inserted */
static struct i2c_driver ltc4215_driver = {
.class = I2C_CLASS_HWMON,
.driver = {
.name = "ltc4215",
},
.probe = ltc4215_probe,
.remove = ltc4215_remove,
.id_table = ltc4215_id,
.detect = ltc4215_detect,
.address_data = &addr_data,
};
static int __init ltc4215_init(void)
......
......@@ -22,15 +22,6 @@
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
/* Valid addresses are 0x20 - 0x3f
*
* For now, we do not probe, since some of these addresses
* are known to be unfriendly to probing */
static const unsigned short normal_i2c[] = { I2C_CLIENT_END };
/* Insmod parameters */
I2C_CLIENT_INSMOD_1(ltc4245);
/* Here are names of the chip's registers (a.k.a. commands) */
enum ltc4245_cmd {
LTC4245_STATUS = 0x00, /* readonly */
......@@ -369,9 +360,13 @@ static const struct attribute_group ltc4245_group = {
static int ltc4245_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct i2c_adapter *adapter = client->adapter;
struct ltc4245_data *data;
int ret;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
return -ENODEV;
data = kzalloc(sizeof(*data), GFP_KERNEL);
if (!data) {
ret = -ENOMEM;
......@@ -418,136 +413,20 @@ static int ltc4245_remove(struct i2c_client *client)
return 0;
}
/* Check that some bits in a control register appear at all possible
* locations without changing value
*
* @client: the i2c client to use
* @reg: the register to read
* @bits: the bits to check (0xff checks all bits,
* 0x03 checks only the last two bits)
*
* return -ERRNO if the register read failed
* return -ENODEV if the register value doesn't stay constant at all
* possible addresses
*
* return 0 for success
*/
static int ltc4245_check_control_reg(struct i2c_client *client, u8 reg, u8 bits)
{
int i;
s32 v, voff1, voff2;
/* Read register and check for error */
v = i2c_smbus_read_byte_data(client, reg);
if (v < 0)
return v;
v &= bits;
for (i = 0x00; i < 0xff; i += 0x20) {
voff1 = i2c_smbus_read_byte_data(client, reg + i);
if (voff1 < 0)
return voff1;
voff2 = i2c_smbus_read_byte_data(client, reg + i + 0x08);
if (voff2 < 0)
return voff2;
voff1 &= bits;
voff2 &= bits;
if (v != voff1 || v != voff2)
return -ENODEV;
}
return 0;
}
static int ltc4245_detect(struct i2c_client *client,
int kind,
struct i2c_board_info *info)
{
struct i2c_adapter *adapter = client->adapter;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
return -ENODEV;
if (kind < 0) { /* probed detection - check the chip type */
s32 v; /* 8 bits from the chip, or -ERRNO */
/* Chip registers 0x00-0x07 are control registers
* Chip registers 0x10-0x1f are data registers
*
* Address bits b7-b5 are ignored. This makes the chip "repeat"
* in steps of 0x20. Any control registers should appear with
* the same values across all duplicated addresses.
*
* Register 0x02 bit b2 is reserved, expect 0
* Register 0x07 bits b7 to b4 are reserved, expect 0
*
* Registers 0x01, 0x02 are control registers and should not
* change on their own.
*
* Register 0x06 bits b6 and b7 are control bits, and should
* not change on their own.
*
* Register 0x07 bits b3 to b0 are control bits, and should
* not change on their own.
*/
/* read register 0x02 reserved bit, expect 0 */
v = i2c_smbus_read_byte_data(client, LTC4245_CONTROL);
if (v < 0 || (v & 0x04) != 0)
return -ENODEV;
/* read register 0x07 reserved bits, expect 0 */
v = i2c_smbus_read_byte_data(client, LTC4245_ADCADR);
if (v < 0 || (v & 0xf0) != 0)
return -ENODEV;
/* check that the alert register appears at all locations */
if (ltc4245_check_control_reg(client, LTC4245_ALERT, 0xff))
return -ENODEV;
/* check that the control register appears at all locations */
if (ltc4245_check_control_reg(client, LTC4245_CONTROL, 0xff))
return -ENODEV;
/* check that register 0x06 bits b6 and b7 stay constant */
if (ltc4245_check_control_reg(client, LTC4245_GPIO, 0xc0))
return -ENODEV;
/* check that register 0x07 bits b3-b0 stay constant */
if (ltc4245_check_control_reg(client, LTC4245_ADCADR, 0x0f))
return -ENODEV;
}
strlcpy(info->type, "ltc4245", I2C_NAME_SIZE);
dev_info(&adapter->dev, "ltc4245 %s at address 0x%02x\n",
kind < 0 ? "probed" : "forced",
client->addr);
return 0;
}
static const struct i2c_device_id ltc4245_id[] = {
{ "ltc4245", ltc4245 },
{ "ltc4245", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, ltc4245_id);
/* This is the driver that will be inserted */
static struct i2c_driver ltc4245_driver = {
.class = I2C_CLASS_HWMON,
.driver = {
.name = "ltc4245",
},
.probe = ltc4245_probe,
.remove = ltc4245_remove,
.id_table = ltc4245_id,
.detect = ltc4245_detect,
.address_data = &addr_data,
};
static int __init ltc4245_init(void)
......
......@@ -364,7 +364,7 @@ static int __devinit amd756_probe(struct pci_dev *pdev,
error = acpi_check_region(amd756_ioport, SMB_IOSIZE,
amd756_driver.name);
if (error)
return error;
return -ENODEV;
if (!request_region(amd756_ioport, SMB_IOSIZE, amd756_driver.name)) {
dev_err(&pdev->dev, "SMB region 0x%x already in use!\n",
......
......@@ -376,8 +376,10 @@ static int __devinit amd8111_probe(struct pci_dev *dev,
smbus->size = pci_resource_len(dev, 0);
error = acpi_check_resource_conflict(&dev->resource[0]);
if (error)
if (error) {
error = -ENODEV;
goto out_kfree;
}
if (!request_region(smbus->base, smbus->size, amd8111_driver.name)) {
error = -EBUSY;
......
......@@ -732,8 +732,10 @@ static int __devinit i801_probe(struct pci_dev *dev, const struct pci_device_id
}
err = acpi_check_resource_conflict(&dev->resource[SMBBAR]);
if (err)
if (err) {
err = -ENODEV;
goto exit;
}
err = pci_request_region(dev, SMBBAR, i801_driver.name);
if (err) {
......
......@@ -281,7 +281,7 @@ static int __devinit sch_probe(struct pci_dev *dev,
return -ENODEV;
}
if (acpi_check_region(sch_smba, SMBIOSIZE, sch_driver.name))
return -EBUSY;
return -ENODEV;
if (!request_region(sch_smba, SMBIOSIZE, sch_driver.name)) {
dev_err(&dev->dev, "SMBus region 0x%x already in use!\n",
sch_smba);
......
......@@ -169,7 +169,7 @@ static int __devinit piix4_setup(struct pci_dev *PIIX4_dev,
}
if (acpi_check_region(piix4_smba, SMBIOSIZE, piix4_driver.name))
return -EBUSY;
return -ENODEV;
if (!request_region(piix4_smba, SMBIOSIZE, piix4_driver.name)) {
dev_err(&PIIX4_dev->dev, "SMBus region 0x%x already in use!\n",
......@@ -260,7 +260,7 @@ static int __devinit piix4_setup_sb800(struct pci_dev *PIIX4_dev,
piix4_smba = ((smba_en_hi << 8) | smba_en_lo) & 0xffe0;
if (acpi_check_region(piix4_smba, SMBIOSIZE, piix4_driver.name))
return -EBUSY;
return -ENODEV;
if (!request_region(piix4_smba, SMBIOSIZE, piix4_driver.name)) {
dev_err(&PIIX4_dev->dev, "SMBus region 0x%x already in use!\n",
......
......@@ -280,7 +280,7 @@ static int __devinit sis96x_probe(struct pci_dev *dev,
retval = acpi_check_resource_conflict(&dev->resource[SIS96x_BAR]);
if (retval)
return retval;
return -ENODEV;
/* Everything is happy, let's grab the memory and set things up. */
if (!request_region(sis96x_smbus_base, SMB_IOSIZE,
......
......@@ -365,7 +365,7 @@ static int __devinit vt596_probe(struct pci_dev *pdev,
found:
error = acpi_check_region(vt596_smba, 8, vt596_driver.name);
if (error)
return error;
return -ENODEV;
if (!request_region(vt596_smba, 8, vt596_driver.name)) {
dev_err(&pdev->dev, "SMBus region 0x%x already in use!\n",
......
......@@ -19,9 +19,6 @@
#include <linux/workqueue.h>
#include <linux/leds-pca9532.h>
static const unsigned short normal_i2c[] = { /*0x60,*/ I2C_CLIENT_END};
I2C_CLIENT_INSMOD_1(pca9532);
#define PCA9532_REG_PSC(i) (0x2+(i)*2)
#define PCA9532_REG_PWM(i) (0x3+(i)*2)
#define PCA9532_REG_LS0 0x6
......
......@@ -124,6 +124,8 @@ read_reg(struct thermostat* th, int reg)
return data;
}
static struct i2c_driver thermostat_driver;
static int
attach_thermostat(struct i2c_adapter *adapter)
{
......@@ -148,7 +150,7 @@ attach_thermostat(struct i2c_adapter *adapter)
* Let i2c-core delete that device on driver removal.
* This is safe because i2c-core holds the core_lock mutex for us.
*/
list_add_tail(&client->detected, &client->driver->clients);
list_add_tail(&client->detected, &thermostat_driver.clients);
return 0;
}
......
......@@ -286,6 +286,8 @@ struct fcu_fan_table fcu_fans[] = {
},
};
static struct i2c_driver therm_pm72_driver;
/*
* Utility function to create an i2c_client structure and
* attach it to one of u3 adapters
......@@ -318,7 +320,7 @@ static struct i2c_client *attach_i2c_chip(int id, const char *name)
* Let i2c-core delete that device on driver removal.
* This is safe because i2c-core holds the core_lock mutex for us.
*/
list_add_tail(&clt->detected, &clt->driver->clients);
list_add_tail(&clt->detected, &therm_pm72_driver.clients);
return clt;
}
......
......@@ -115,6 +115,8 @@ static int wf_lm75_probe(struct i2c_client *client,
return rc;
}
static struct i2c_driver wf_lm75_driver;
static struct i2c_client *wf_lm75_create(struct i2c_adapter *adapter,
u8 addr, int ds1775,
const char *loc)
......@@ -157,7 +159,7 @@ static struct i2c_client *wf_lm75_create(struct i2c_adapter *adapter,
* Let i2c-core delete that device on driver removal.
* This is safe because i2c-core holds the core_lock mutex for us.
*/
list_add_tail(&client->detected, &client->driver->clients);
list_add_tail(&client->detected, &wf_lm75_driver.clients);
return client;
fail:
return NULL;
......
......@@ -88,6 +88,8 @@ static int wf_max6690_probe(struct i2c_client *client,
return rc;
}
static struct i2c_driver wf_max6690_driver;
static struct i2c_client *wf_max6690_create(struct i2c_adapter *adapter,
u8 addr, const char *loc)
{
......@@ -119,7 +121,7 @@ static struct i2c_client *wf_max6690_create(struct i2c_adapter *adapter,
* Let i2c-core delete that device on driver removal.
* This is safe because i2c-core holds the core_lock mutex for us.
*/
list_add_tail(&client->detected, &client->driver->clients);
list_add_tail(&client->detected, &wf_max6690_driver.clients);
return client;
fail:
......
......@@ -194,6 +194,8 @@ static struct wf_sensor_ops wf_sat_ops = {
.owner = THIS_MODULE,
};
static struct i2c_driver wf_sat_driver;
static void wf_sat_create(struct i2c_adapter *adapter, struct device_node *dev)
{
struct i2c_board_info info;
......@@ -222,7 +224,7 @@ static void wf_sat_create(struct i2c_adapter *adapter, struct device_node *dev)
* Let i2c-core delete that device on driver removal.
* This is safe because i2c-core holds the core_lock mutex for us.
*/
list_add_tail(&client->detected, &client->driver->clients);
list_add_tail(&client->detected, &wf_sat_driver.clients);
}
static int wf_sat_probe(struct i2c_client *client,
......
......@@ -57,8 +57,6 @@
* The AB3100 is usually assigned address 0x48 (7-bit)
* The chip is defined in the platform i2c_board_data section.
*/
static unsigned short normal_i2c[] = { 0x48, I2C_CLIENT_END };
I2C_CLIENT_INSMOD_1(ab3100);
u8 ab3100_get_chip_type(struct ab3100 *ab3100)
{
......@@ -966,7 +964,7 @@ static int __exit ab3100_remove(struct i2c_client *client)
}
static const struct i2c_device_id ab3100_id[] = {
{ "ab3100", ab3100 },
{ "ab3100", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, ab3100_id);
......
......@@ -33,12 +33,6 @@
#include <linux/i2c.h>
#include <linux/mutex.h>
/* Do not scan - the MAX6875 access method will write to some EEPROM chips */
static const unsigned short normal_i2c[] = { I2C_CLIENT_END };
/* Insmod parameters */
I2C_CLIENT_INSMOD_1(max6875);
/* The MAX6875 can only read/write 16 bytes at a time */
#define SLICE_SIZE 16
#define SLICE_BITS 4
......@@ -146,31 +140,21 @@ static struct bin_attribute user_eeprom_attr = {
.read = max6875_read,
};
/* Return 0 if detection is successful, -ENODEV otherwise */
static int max6875_detect(struct i2c_client *client, int kind,
struct i2c_board_info *info)
static int max6875_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct i2c_adapter *adapter = client->adapter;
struct max6875_data *data;
int err;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WRITE_BYTE_DATA
| I2C_FUNC_SMBUS_READ_BYTE))
return -ENODEV;
/* Only check even addresses */
/* Only bind to even addresses */
if (client->addr & 1)
return -ENODEV;
strlcpy(info->type, "max6875", I2C_NAME_SIZE);
return 0;
}
static int max6875_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct max6875_data *data;
int err;
if (!(data = kzalloc(sizeof(struct max6875_data), GFP_KERNEL)))
return -ENOMEM;
......@@ -222,9 +206,6 @@ static struct i2c_driver max6875_driver = {
.probe = max6875_probe,
.remove = max6875_remove,
.id_table = max6875_id,
.detect = max6875_detect,
.address_data = &addr_data,
};
static int __init max6875_init(void)
......
......@@ -239,10 +239,6 @@ static int __devexit tsl2561_remove(struct i2c_client *client)
return tsl2561_powerdown(client);
}
static unsigned short normal_i2c[] = { 0x29, 0x39, 0x49, I2C_CLIENT_END };
I2C_CLIENT_INSMOD;
static const struct i2c_device_id tsl2561_id[] = {
{ "tsl2561", 0 },
{ }
......
......@@ -23,19 +23,6 @@
#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 const unsigned short normal_i2c[] = { I2C_CLIENT_END };
/**
* Insmod parameters