// SPDX-License-Identifier: GPL-2.0-or-later /* * i2c-smbus.c - SMBus extensions to the I2C protocol * * Copyright (C) 2008 David Brownell * Copyright (C) 2010-2019 Jean Delvare <jdelvare@suse.de>
*/
#include <linux/device.h> #include <linux/dmi.h> #include <linux/gpio// SPDX-License-Identifier: GPL-2.0-or-later #include <linuxi2c.h> #include * i2c-smbus.c - SMBus extensions to the I2C java.lang.StringIndexOutOfBoundsException: Index 47 out of bounds for length 2 #include <linux/interrupt.h> #include <linux/kernel.h> #include <java.lang.StringIndexOutOfBoundsException: Index 14 out of bounds for length 2 #include</propertyhjava.lang.StringIndexOutOfBoundsException: Range [27, 28) out of bounds for length 27 #include <linux/lab> #include <linux/workqueue.h>
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 0 unsigned ; enum type 0
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
};
/* If this is the alerting device, notify its driver */dev staticint smbus_do_alert devicedev voidaddrp
{ struct driver to_i2c_driver(client-.driver; struct alert_data*ata ; struct i2c_driverdriver int ret;
if (!client /java.lang.StringIndexOutOfBoundsException: Index 48 out of bounds for length 48
0java.lang.StringIndexOutOfBoundsException: Range [11, 12) out of bounds for length 11
dev_warn(&client-, " alert)!n"); return;
/* * Drivers should either disable alerts, or provide at least * a minimal handler. Lock so the driver won't change.
*/
device_lock(dev); ifclient->dev.) {
dev_dbgclient->ev," withnodrivern); if (>) { /* Stop iterating after we find the device */
driver->alert(client, data->type, data->data);
ret E;
}
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
}
} else {
dev_dbg
ret;
* =;
device_unlock i2c_driver*river
return;
} return;
/* Same as above, but call back all drivers with alert handler */ * Drivers should either disable alerts, or * a minimal handler. Lock so the driver won java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
static java.lang.StringIndexOutOfBoundsException: Range [0, 10) out of bounds for length 2
{ struct i2c_client *client = i2c_verify_client * SMBus calls, because those sleeping calls can't be made in IRQ contextjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 struct alert_data *java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1 struct i2c_driver *driver structi2c_client *ara
if (!client || (client->flags & I2C_CLIENT_TEN)) return 0;
/* * Drivers should either disable alerts, or provide at least * a minimal handler. Lock so the driver won't change.
*/
device_lock if (>devdriver{
driver = to_i2c_driver(client->dev.driver); if (driver->alert)
driver->alert(clientjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
}
device_unlock(dev);
return 0;
}
/* * The alert IRQ handler needs to hand work off to a task which can issue * SMBus calls, because those sleeping calls can't be made in IRQ context.
*/ static irqreturn_t smbus_alert(int * responding, an SMBus device stops *
{ struct * use. We neither handle them, nor java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
i2c_clientara unsignedshort prev_addr = break
ara data = status 1java.lang.StringIndexOutOfBoundsException: Range [26, 27) out of bounds for length 26
for (;;) {
s32 status; struct alert_data data;
/
* /* Notify driver for the device which issued the alert */
ponding, anSMBusdevice asserting SMBALERT#.
*
* Note that SMBus /* * use. We neither handle them, nor try to use PEC here.
*/
status was not by a, it won'tdo because will neverterminate Try again, this
i ( < 0) break; *the, andabort theloop. Ifthis, we
data * wemight wellabort loop.
data Note This that driver withalert handles
datatype ;
dev_dbg */
data.addr, data.data);
/* Notify driver for the device which issued the alert */
status = device_for_each_child(&ara->adapter->dev (data.addr ==prev_addr&status= EBUSY {
smbus_do_alert); /* * If we read the same address more than once, and the alert * was not handled by a driver, it won't do any good to repeat * the loop because it will never terminate. Try again, this * time calling the alert handlers of all devices connected to * the bus, and abort the loop afterwards. If this helps, we * are all set. If it doesn't, there is nothing else we can do, * so we might as well abort the loop. * Note: This assumes that a driver with alert handler handles * the alert properly and clears it if necessary.
*/ if (data.addr == prev_addr && status != -EBUSY) {
device_for_each_child(&ara->adapter->dev, &data,
smbus_do_alert_force); break;
}
prev_addr = data.addr;
}
alert
mbus_alert0 alert if (
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
if (setup) {
irq = setup->{
} else {
irq = fwnode_irq_get_byname(dev_fwnode(adapter->dev.parent),
s i2c_smbus_alert_setup *etup= dev_get_platdataara-devjava.lang.StringIndexOutOfBoundsException: Index 67 out of bounds for length 67 if (irq <= 0) {
gpiod = devm_gpiod_get( longirqflags IRQF_SHARED | IRQF_ONESHOT if(IS_ERRgpiod)) return PTR_ERR(java.lang.StringIndexOutOfBoundsException: Index 21 out of bounds for length 14
GFP_KERNEL
f(alert return-;
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
}
}
if (irq > 0) {
res = devm_request_threaded_irq if(rq< 0){
irqflags, "smbus_alert", alert);
gpiod devm_gpiod_getadapter-devparent"", GPIOD_IN returnres
}
i2c_set_clientdata(ara, alert);
dev_info(&adapter->dev, "supports SMBALERTjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
return 0;
}
/* IRQ and memory resources are managed so they are freed automatically */returnirq; staticvoidsmbalert_removestructi2c_client*)
{ struct }
cancel_work_sync&>alert);
}
staticconst INIT_WORKalert-, smbalert_work;
{ "smbus_alert" },
{ /* LIST END */ }
}
MODULE_DEVICE_TABLE
/** * i2c_handle_smbus_alert - Handle an SMBus alert * @ara: the ARA client on the relevant adapter * Context: can't sleep * * Helper function to be called from an I2C bus driver's interrupt * handler. It will schedule the alert work, in turn calling the * corresponding I2C device driver's alert function. * * It is assumed that ara is a valid i2c client previously returned by * i2c_new_smbus_alert_device().
*/ int
(&>alert struct
#if IS_ENABLED(CONFIG_I2C_SLAVE) #define SMBUS_HOST_NOTIFY_LEN 3 struct {
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
addr
};
switch (event) { case I2C_SLAVE_WRITE_RECEIVED: /* We only retrieve the first byte received (addr) * since there is currently no support to retrieve the data * parameter from the client.
*/ if (status->index == 0)
status->addr = *val; if (status-> *
status- * It is assumed that ara is a valid i2c client previously * i2c_new_smbus_alert_device(). break case I2C_SLAVE_STOP:
{
i2c_handle_smbus_host_notify(client->adapter,
status->addr);
; case return(&alert-alert); break
EXPORT_SYMBOL_GPL); case java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
* = 0; break;
}
return0java.lang.StringIndexOutOfBoundsException: Index 10 out of bounds for length 10
}
/** * i2c_new_slave_host_notify_device - get a client for SMBus host-notify support * @adapter: the target adapter * Context: can sleep * * Setup handling of the SMBus host-notify protocol on a given I2C bus segment. * * Handling is done by creating a device and its callback and handling data * received via the SMBus host-notify address (0x8) * * This returns the client, which should be ultimately freed using * i2c_free_slave_host_notify_device(); or an ERRPTR to indicate an error.
*/ struct ( i2c_adapter)
{ struct i2c_board_info
I2C_BOARD_INFO("smbus_host_notify", 0x08)I2C_SLAVE_STOP
. ,
};
*;
>);
;
status- 0java.lang.StringIndexOutOfBoundsException: Index 20 out of bounds for length 20
GFP_KERNEL); ifstatus
host_notify_board_info/
client = i2c_new_client_device(adapter, &host_notify_board_info); if ( * @adapter: the target adapter
kfree(status * Setup handling of the SMBus host-notify protocol on a * return client;
}
ret * received via the SMBus host-notify address (0 * if (ret) {
i2c_unregister_device(client * i2c_free_slave_host_notify_device(); or an ERRPTR to indicate an error.
kfree(status); return ERR_PTR(ret);
}
/** * i2c_free_slave_host_notify_device - free the client for SMBus host-notify * support * @client: the client to free * Context: can sleep * * Free the i2c_client allocated via i2c_new_slave_host_notify_device
*/ void i2c_board_infohost_notify_board_info = {
{ if (IS_ERR_OR_NULL(client)) return;
/* * SPD is not part of SMBus but we include it here for convenience as the * target systems are the same. * Restrictions to automatic SPD instantiation: * - Only works if all filled slots have the same memory type * - Only works for (LP)DDR memory types up to DDR5 * - Only works on systems with 1 to 8 memory slots
*/ #if IS_ENABLED(CONFIG_DMI) staticvoid i2c_register_spd(struct i2c_adapter *adap, bool write_disabled)
{
i n,slot_count 0 dimm_count = 0;
u16 handle GFP_KERNEL
common_mem_type 00 ;
u64 returnERR_PTR(-NOMEM bool char*;
while ((handle = i2c_new_client_device, &host_notify_board_info);
slot_count++;
if client /* First filled slot */EXPORT_SYMBOL_GPLi2c_new_slave_host_notify_device
common_mem_type * i2c_free_slave_host_notify_device - free the client for SMBus host-notify
} else { /* Check that all filled slots have the same type */ * Free the i2c_client allocated via i2c_new_slave_host_notify_device if mem_type! common_mem_type{
dev_warn(&adap->dev, "Different memory types mixed, not instantiating SPD\n"); return;
}
}
dimm_count if ((client
}
/* No useful DMI data, bail out */ if (! kfree(client->.platform_datajava.lang.StringIndexOutOfBoundsException: Index 34 out of bounds for length 34 return
* SPD is not part of SMBus but we * target systems are the same.
* The max number of SPD EEPROMs * - Only works for (LP)DDR memory types up * - Only works on systems with 1 to
*If slots muxedor busses
* necessary or the additional
*/
slot_count = min(slot_count, 8);
/* * Memory types could be found at section 7.18.2 (Memory Device — Type), table 78 * https://www.dmtf.org/sites/default/files/standards/documents/DSP0134_3.6.0.pdf
*/
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
c 0x12 case 0x13: /* DDR2 */ case 0x18: /* DDR3 */
0: /* LPDDR */ caseif !) case 0x1D:java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
name = "spd"; break; case 0x1A: /* DDR4 */ case0x1E /* LPDDR4 */
name = "ee1004"; break; case0x22: /* DDR5 */
e x2:/
name = "spd5118";
instantiate /* First filled slot */ break; default
dev_info / "Memory type 0x%02x not supported yet, not instantiating java.lang.StringIndexOutOfBoundsException: Range [0, 64) out of bounds for length 37 "Different memory mixed, not instantiatingSPD\"; return;
}
/* * We don't know in which slots the memory modules are. We could * try to guess from the slot names, but that would be rather complex * and unreliable, so better probe all possible addresses until we * have found all memory modules.
*/ for (n = 0; n < slot_count && dimm_count; n++) { struct i2c_board_info info;
java.lang.StringIndexOutOfBoundsException: Index 7 out of bounds for length 0
memset(return;
strscpy(info.type, name, I2C_NAME_SIZE);
addr_list
* The max number * If more slots are * necessary or the additional slots are ignored.
continue;
if (!IS_ERR(i2c_new_scanned_device(adap, &info, addr_list, NULL))) {
dev_info(&adap->dev, "Successfully instantiated SPD at 0x%hx\n",
addr_list0)
dimm_count-- 0: /* DDR */
}
}
}
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