hwmon/it87: Remove the SMBus interface support
This interface was useless as the LPC ISA-like interface is always available, is faster, and is more reliable. This cuts the driver size by some 20%. This change is also required to later convert the it87 driver to a platform driver, so that we can get rid of i2c-isa in a near future. Signed-off-by: Jean Delvare <khali@linux-fr.org>
This commit is contained in:
Jean Delvare
Jean Delvare
parent
0f23e50aa5
commit
8e9afcbbde
4 changed files with 64 additions and 163 deletions
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@ -151,15 +151,6 @@ Who: Thomas Gleixner <tglx@linutronix.de>
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---------------------------
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What: I2C interface of the it87 driver
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When: January 2007
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Why: The ISA interface is faster and should be always available. The I2C
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probing is also known to cause trouble in at least one case (see
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bug #5889.)
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Who: Jean Delvare <khali@linux-fr.org>
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---------------------------
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What: Unused EXPORT_SYMBOL/EXPORT_SYMBOL_GPL exports
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(temporary transition config option provided until then)
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The transition config option will also be removed at the same time.
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@ -9,8 +9,7 @@ Supported chips:
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http://www.ite.com.tw/
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* IT8712F
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Prefix: 'it8712'
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Addresses scanned: I2C 0x2d
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from Super I/O config space (8 I/O ports)
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Addresses scanned: from Super I/O config space (8 I/O ports)
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Datasheet: Publicly available at the ITE website
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http://www.ite.com.tw/
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* IT8716F
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@ -53,6 +52,18 @@ Module Parameters
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misconfigured by BIOS - PWM values would be inverted. This option tries
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to fix this. Please contact your BIOS manufacturer and ask him for fix.
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Hardware Interfaces
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-------------------
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All the chips suported by this driver are LPC Super-I/O chips, accessed
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through the LPC bus (ISA-like I/O ports). The IT8712F additionally has an
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SMBus interface to the hardware monitoring functions. This driver no
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longer supports this interface though, as it is slower and less reliable
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than the ISA access, and was only available on a small number of
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motherboard models.
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Description
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-----------
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@ -3,7 +3,7 @@
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monitoring.
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Supports: IT8705F Super I/O chip w/LPC interface
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IT8712F Super I/O chip w/LPC interface & SMBus
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IT8712F Super I/O chip w/LPC interface
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IT8716F Super I/O chip w/LPC interface
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IT8718F Super I/O chip w/LPC interface
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Sis950 A clone of the IT8705F
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@ -41,12 +41,8 @@
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#include <asm/io.h>
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/* Addresses to scan */
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static unsigned short normal_i2c[] = { 0x2d, I2C_CLIENT_END };
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static unsigned short isa_address;
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/* Insmod parameters */
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I2C_CLIENT_INSMOD_4(it87, it8712, it8716, it8718);
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enum chips { it87, it8712, it8716, it8718 };
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#define REG 0x2e /* The register to read/write */
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#define DEV 0x07 /* Register: Logical device select */
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@ -162,8 +158,6 @@ static u8 vid_value;
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#define IT87_REG_TEMP_HIGH(nr) (0x40 + (nr) * 2)
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#define IT87_REG_TEMP_LOW(nr) (0x41 + (nr) * 2)
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#define IT87_REG_I2C_ADDR 0x48
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#define IT87_REG_VIN_ENABLE 0x50
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#define IT87_REG_TEMP_ENABLE 0x51
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@ -242,33 +236,22 @@ struct it87_data {
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};
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static int it87_attach_adapter(struct i2c_adapter *adapter);
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static int it87_isa_attach_adapter(struct i2c_adapter *adapter);
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static int it87_detect(struct i2c_adapter *adapter, int address, int kind);
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static int it87_detect(struct i2c_adapter *adapter);
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static int it87_detach_client(struct i2c_client *client);
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static int it87_read_value(struct i2c_client *client, u8 reg);
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static int it87_write_value(struct i2c_client *client, u8 reg, u8 value);
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static void it87_write_value(struct i2c_client *client, u8 reg, u8 value);
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static struct it87_data *it87_update_device(struct device *dev);
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static int it87_check_pwm(struct i2c_client *client);
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static void it87_init_client(struct i2c_client *client, struct it87_data *data);
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static struct i2c_driver it87_driver = {
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.driver = {
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.name = "it87",
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},
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.id = I2C_DRIVERID_IT87,
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.attach_adapter = it87_attach_adapter,
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.detach_client = it87_detach_client,
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};
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static struct i2c_driver it87_isa_driver = {
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.driver = {
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.owner = THIS_MODULE,
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.name = "it87-isa",
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},
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.attach_adapter = it87_isa_attach_adapter,
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.attach_adapter = it87_detect,
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.detach_client = it87_detach_client,
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};
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@ -850,22 +833,6 @@ static const struct attribute_group it87_group_opt = {
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.attrs = it87_attributes_opt,
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};
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/* This function is called when:
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* it87_driver is inserted (when this module is loaded), for each
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available adapter
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* when a new adapter is inserted (and it87_driver is still present) */
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static int it87_attach_adapter(struct i2c_adapter *adapter)
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{
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if (!(adapter->class & I2C_CLASS_HWMON))
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return 0;
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return i2c_probe(adapter, &addr_data, it87_detect);
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}
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static int it87_isa_attach_adapter(struct i2c_adapter *adapter)
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{
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return it87_detect(adapter, isa_address, -1);
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}
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/* SuperIO detection - will change isa_address if a chip is found */
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static int __init it87_find(unsigned short *address)
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{
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@ -916,29 +883,20 @@ static int __init it87_find(unsigned short *address)
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}
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/* This function is called by i2c_probe */
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static int it87_detect(struct i2c_adapter *adapter, int address, int kind)
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static int it87_detect(struct i2c_adapter *adapter)
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{
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int i;
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struct i2c_client *new_client;
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struct it87_data *data;
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int err = 0;
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const char *name = "";
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int is_isa = i2c_is_isa_adapter(adapter);
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const char *name;
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int enable_pwm_interface;
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if (!is_isa &&
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!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
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goto ERROR0;
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/* Reserve the ISA region */
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if (is_isa)
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if (!request_region(address, IT87_EXTENT,
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it87_isa_driver.driver.name))
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if (!request_region(isa_address, IT87_EXTENT,
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it87_isa_driver.driver.name)){
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err = -EBUSY;
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goto ERROR0;
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/* For now, we presume we have a valid client. We create the
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client structure, even though we cannot fill it completely yet.
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But it allows us to access it87_{read,write}_value. */
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}
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if (!(data = kzalloc(sizeof(struct it87_data), GFP_KERNEL))) {
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err = -ENOMEM;
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@ -946,80 +904,46 @@ static int it87_detect(struct i2c_adapter *adapter, int address, int kind)
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}
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new_client = &data->client;
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if (is_isa)
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mutex_init(&data->lock);
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i2c_set_clientdata(new_client, data);
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new_client->addr = address;
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new_client->addr = isa_address;
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new_client->adapter = adapter;
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new_client->driver = is_isa ? &it87_isa_driver : &it87_driver;
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new_client->flags = 0;
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new_client->driver = &it87_isa_driver;
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/* Now, we do the remaining detection. */
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if (kind < 0) {
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if ((it87_read_value(new_client, IT87_REG_CONFIG) & 0x80)
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|| (!is_isa
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&& it87_read_value(new_client, IT87_REG_I2C_ADDR) != address)) {
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|| it87_read_value(new_client, IT87_REG_CHIPID) != 0x90) {
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err = -ENODEV;
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goto ERROR2;
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}
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}
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/* Determine the chip type. */
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if (kind <= 0) {
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i = it87_read_value(new_client, IT87_REG_CHIPID);
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if (i == 0x90) {
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kind = it87;
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if (is_isa) {
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switch (chip_type) {
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case IT8712F_DEVID:
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kind = it8712;
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data->type = it8712;
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name = "it8712";
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break;
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case IT8716F_DEVID:
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kind = it8716;
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data->type = it8716;
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name = "it8716";
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break;
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case IT8718F_DEVID:
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kind = it8718;
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break;
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}
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}
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}
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else {
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if (kind == 0)
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dev_info(&adapter->dev,
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"Ignoring 'force' parameter for unknown chip at "
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"adapter %d, address 0x%02x\n",
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i2c_adapter_id(adapter), address);
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err = -ENODEV;
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goto ERROR2;
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}
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}
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if (kind == it87) {
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name = "it87";
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} else if (kind == it8712) {
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name = "it8712";
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} else if (kind == it8716) {
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name = "it8716";
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} else if (kind == it8718) {
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data->type = it8718;
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name = "it8718";
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break;
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default:
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data->type = it87;
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name = "it87";
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}
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/* Fill in the remaining client fields and put it into the global list */
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strlcpy(new_client->name, name, I2C_NAME_SIZE);
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data->type = kind;
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data->valid = 0;
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mutex_init(&data->update_lock);
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/* Tell the I2C layer a new client has arrived */
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if ((err = i2c_attach_client(new_client)))
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goto ERROR2;
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if (!is_isa)
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dev_info(&new_client->dev, "The I2C interface to IT87xxF "
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"hardware monitoring chips is deprecated. Please "
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"report if you still rely on it.\n");
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/* Check PWM configuration */
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enable_pwm_interface = it87_check_pwm(new_client);
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@ -1129,8 +1053,7 @@ static int it87_detect(struct i2c_adapter *adapter, int address, int kind)
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ERROR2:
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kfree(data);
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ERROR1:
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if (is_isa)
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release_region(address, IT87_EXTENT);
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release_region(isa_address, IT87_EXTENT);
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ERROR0:
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return err;
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}
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@ -1147,50 +1070,39 @@ static int it87_detach_client(struct i2c_client *client)
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if ((err = i2c_detach_client(client)))
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return err;
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if(i2c_is_isa_client(client))
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release_region(client->addr, IT87_EXTENT);
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kfree(data);
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return 0;
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}
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/* The SMBus locks itself, but ISA access must be locked explicitly!
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We don't want to lock the whole ISA bus, so we lock each client
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separately.
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/* ISA access must be locked explicitly!
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We ignore the IT87 BUSY flag at this moment - it could lead to deadlocks,
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would slow down the IT87 access and should not be necessary. */
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static int it87_read_value(struct i2c_client *client, u8 reg)
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{
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struct it87_data *data = i2c_get_clientdata(client);
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int res;
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if (i2c_is_isa_client(client)) {
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mutex_lock(&data->lock);
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outb_p(reg, client->addr + IT87_ADDR_REG_OFFSET);
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res = inb_p(client->addr + IT87_DATA_REG_OFFSET);
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mutex_unlock(&data->lock);
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return res;
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} else
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return i2c_smbus_read_byte_data(client, reg);
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}
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/* The SMBus locks itself, but ISA access muse be locked explicitly!
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We don't want to lock the whole ISA bus, so we lock each client
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separately.
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/* ISA access must be locked explicitly!
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We ignore the IT87 BUSY flag at this moment - it could lead to deadlocks,
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would slow down the IT87 access and should not be necessary. */
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static int it87_write_value(struct i2c_client *client, u8 reg, u8 value)
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static void it87_write_value(struct i2c_client *client, u8 reg, u8 value)
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{
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struct it87_data *data = i2c_get_clientdata(client);
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if (i2c_is_isa_client(client)) {
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mutex_lock(&data->lock);
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outb_p(reg, client->addr + IT87_ADDR_REG_OFFSET);
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outb_p(value, client->addr + IT87_DATA_REG_OFFSET);
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mutex_unlock(&data->lock);
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return 0;
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} else
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return i2c_smbus_write_byte_data(client, reg, value);
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}
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/* Return 1 if and only if the PWM interface is safe to use */
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@ -1426,26 +1338,14 @@ static int __init sm_it87_init(void)
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{
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int res;
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res = i2c_add_driver(&it87_driver);
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if (res)
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if ((res = it87_find(&isa_address)))
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return res;
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if (!it87_find(&isa_address)) {
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res = i2c_isa_add_driver(&it87_isa_driver);
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if (res) {
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i2c_del_driver(&it87_driver);
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return res;
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}
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}
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return 0;
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return i2c_isa_add_driver(&it87_isa_driver);
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}
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static void __exit sm_it87_exit(void)
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{
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if (isa_address)
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i2c_isa_del_driver(&it87_isa_driver);
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i2c_del_driver(&it87_driver);
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}
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@ -144,7 +144,6 @@
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#define I2C_DRIVERID_MTP008 1023
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#define I2C_DRIVERID_DS1621 1024
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#define I2C_DRIVERID_ADM1024 1025
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#define I2C_DRIVERID_IT87 1026
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#define I2C_DRIVERID_CH700X 1027 /* single driver for CH7003-7009 digital pc to tv encoders */
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#define I2C_DRIVERID_FSCPOS 1028
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#define I2C_DRIVERID_FSCSCY 1029
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