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drivers: ipmi: Support raw i2c packet in IPMB

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Many IPMB devices don't support smbus protocol and this driver
only supports the smbus protocol at the moment.

Added support for the i2c protocol as well. There will be a variable
"i2c-protocol" passed by the device tree or ACPI table which determines
whether the protocol is i2c or smbus.

Signed-off-by: Vijay Khemka <vijaykhemka@fb.com>
Reviewed-by: Asmaa Mnebhi <asmaa@mellanox.com>
Message-Id: <20191211185604.1266063-1-vijaykhemka@fb.com>
[IPMB.txt had moved to driver-api/ipmb.rst, I adjusted]
Signed-off-by: Corey Minyard <cminyard@mvista.com>
This commit is contained in:
Vijay Khemka 2019-12-11 10:56:04 -08:00 committed by Corey Minyard
parent 6794862a16
commit 042f057fe2
2 changed files with 33 additions and 0 deletions
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4
Documentation/driver-api/ipmb.rst
View File

@ -71,9 +71,13 @@ b) Example for device tree::
ipmb@10 {
compatible = "ipmb-dev";
reg = <0x10>;
i2c-protocol;
};
};
If xmit of data to be done using raw i2c block vs smbus
then "i2c-protocol" needs to be defined as above.
2) Manually from Linux::
modprobe ipmb-dev-int

29
drivers/char/ipmi/ipmb_dev_int.c
View File

@ -63,6 +63,7 @@ struct ipmb_dev {
spinlock_t lock;
wait_queue_head_t wait_queue;
struct mutex file_mutex;
bool is_i2c_protocol;
};
static inline struct ipmb_dev *to_ipmb_dev(struct file *file)
@ -112,6 +113,25 @@ static ssize_t ipmb_read(struct file *file, char __user *buf, size_t count,
return ret < 0 ? ret : count;
}
static int ipmb_i2c_write(struct i2c_client *client, u8 *msg, u8 addr)
{
struct i2c_msg i2c_msg;
/*
* subtract 1 byte (rq_sa) from the length of the msg passed to
* raw i2c_transfer
*/
i2c_msg.len = msg[IPMB_MSG_LEN_IDX] - 1;
/* Assign message to buffer except first 2 bytes (length and address) */
i2c_msg.buf = msg + 2;
i2c_msg.addr = addr;
i2c_msg.flags = client->flags & I2C_CLIENT_PEC;
return i2c_transfer(client->adapter, &i2c_msg, 1);
}
static ssize_t ipmb_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
@ -133,6 +153,12 @@ static ssize_t ipmb_write(struct file *file, const char __user *buf,
rq_sa = GET_7BIT_ADDR(msg[RQ_SA_8BIT_IDX]);
netf_rq_lun = msg[NETFN_LUN_IDX];
/* Check i2c block transfer vs smbus */
if (ipmb_dev->is_i2c_protocol) {
ret = ipmb_i2c_write(ipmb_dev->client, msg, rq_sa);
return (ret == 1) ? count : ret;
}
/*
* subtract rq_sa and netf_rq_lun from the length of the msg passed to
* i2c_smbus_xfer
@ -302,6 +328,9 @@ static int ipmb_probe(struct i2c_client *client,
if (ret)
return ret;
ipmb_dev->is_i2c_protocol
= device_property_read_bool(&client->dev, "i2c-protocol");
ipmb_dev->client = client;
i2c_set_clientdata(client, ipmb_dev);
ret = i2c_slave_register(client, ipmb_slave_cb);