mlxsw: Introduce support for I2C bus (6882b0ae) · Commits · e / devices / android_kernel_oneplus_sm8150

drivers/net/ethernet/mellanox/mlxsw/Kconfig

+10 −0

Original line number	Original line	Diff line number	Diff line
	@@ -29,6 +29,16 @@ config MLXSW_PCI
	To compile this driver as a module, choose M here: the		To compile this driver as a module, choose M here: the
	module will be called mlxsw_pci.		module will be called mlxsw_pci.

			config MLXSW_I2C
			tristate "I2C bus implementation for Mellanox Technologies Switch ASICs"
			depends on I2C && MLXSW_CORE
			default m
			---help---
			This is I2C bus implementation for Mellanox Technologies Switch ASICs.

			To compile this driver as a module, choose M here: the
			module will be called mlxsw_i2c.

	config MLXSW_SWITCHIB		config MLXSW_SWITCHIB
	tristate "Mellanox Technologies SwitchIB and SwitchIB-2 support"		tristate "Mellanox Technologies SwitchIB and SwitchIB-2 support"
	depends on MLXSW_CORE && NET_SWITCHDEV		depends on MLXSW_CORE && NET_SWITCHDEV

drivers/net/ethernet/mellanox/mlxsw/Makefile

+2 −0

Original line number	Original line	Diff line number	Diff line
	@@ -3,6 +3,8 @@ mlxsw_core-objs := core.o
	mlxsw_core-$(CONFIG_MLXSW_CORE_HWMON) += core_hwmon.o		mlxsw_core-$(CONFIG_MLXSW_CORE_HWMON) += core_hwmon.o
	obj-$(CONFIG_MLXSW_PCI) += mlxsw_pci.o		obj-$(CONFIG_MLXSW_PCI) += mlxsw_pci.o
	mlxsw_pci-objs := pci.o		mlxsw_pci-objs := pci.o
			obj-$(CONFIG_MLXSW_I2C) += mlxsw_i2c.o
			mlxsw_i2c-objs := i2c.o
	obj-$(CONFIG_MLXSW_SWITCHIB) += mlxsw_switchib.o		obj-$(CONFIG_MLXSW_SWITCHIB) += mlxsw_switchib.o
	mlxsw_switchib-objs := switchib.o		mlxsw_switchib-objs := switchib.o
	obj-$(CONFIG_MLXSW_SWITCHX2) += mlxsw_switchx2.o		obj-$(CONFIG_MLXSW_SWITCHX2) += mlxsw_switchx2.o

drivers/net/ethernet/mellanox/mlxsw/i2c.c

0 → 100644

+582 −0

Original line number	Original line	Diff line number	Diff line
			/*
			* drivers/net/ethernet/mellanox/mlxsw/i2c.c
			* Copyright (c) 2016 Mellanox Technologies. All rights reserved.
			* Copyright (c) 2016 Vadim Pasternak <vadimp@mellanox.com>
			*
			* Redistribution and use in source and binary forms, with or without
			* modification, are permitted provided that the following conditions are met:
			*
			* 1. Redistributions of source code must retain the above copyright
			* notice, this list of conditions and the following disclaimer.
			* 2. Redistributions in binary form must reproduce the above copyright
			* notice, this list of conditions and the following disclaimer in the
			* documentation and/or other materials provided with the distribution.
			* 3. Neither the names of the copyright holders nor the names of its
			* contributors may be used to endorse or promote products derived from
			* this software without specific prior written permission.
			*
			* Alternatively, this software may be distributed under the terms of the
			* GNU General Public License ("GPL") version 2 as published by the Free
			* Software Foundation.
			*
			* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
			* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
			* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
			* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
			* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
			* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
			* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
			* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
			* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
			* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
			* POSSIBILITY OF SUCH DAMAGE.
			*/

			#include <linux/err.h>
			#include <linux/i2c.h>
			#include <linux/init.h>
			#include <linux/jiffies.h>
			#include <linux/kernel.h>
			#include <linux/mutex.h>
			#include <linux/module.h>
			#include <linux/mod_devicetable.h>
			#include <linux/slab.h>

			#include "cmd.h"
			#include "core.h"
			#include "i2c.h"

			static const char mlxsw_i2c_driver_name[] = "mlxsw_i2c";

			#define MLXSW_I2C_CIR2_BASE 0x72000
			#define MLXSW_I2C_CIR_STATUS_OFF 0x18
			#define MLXSW_I2C_CIR2_OFF_STATUS (MLXSW_I2C_CIR2_BASE + \
			MLXSW_I2C_CIR_STATUS_OFF)
			#define MLXSW_I2C_OPMOD_SHIFT 12
			#define MLXSW_I2C_GO_BIT_SHIFT 23
			#define MLXSW_I2C_CIR_CTRL_STATUS_SHIFT 24
			#define MLXSW_I2C_GO_BIT BIT(MLXSW_I2C_GO_BIT_SHIFT)
			#define MLXSW_I2C_GO_OPMODE BIT(MLXSW_I2C_OPMOD_SHIFT)
			#define MLXSW_I2C_SET_IMM_CMD (MLXSW_I2C_GO_OPMODE \| \
			MLXSW_CMD_OPCODE_QUERY_FW)
			#define MLXSW_I2C_PUSH_IMM_CMD (MLXSW_I2C_GO_BIT \| \
			MLXSW_I2C_SET_IMM_CMD)
			#define MLXSW_I2C_SET_CMD (MLXSW_CMD_OPCODE_ACCESS_REG)
			#define MLXSW_I2C_PUSH_CMD (MLXSW_I2C_GO_BIT \| MLXSW_I2C_SET_CMD)
			#define MLXSW_I2C_TLV_HDR_SIZE 0x10
			#define MLXSW_I2C_ADDR_WIDTH 4
			#define MLXSW_I2C_PUSH_CMD_SIZE (MLXSW_I2C_ADDR_WIDTH + 4)
			#define MLXSW_I2C_READ_SEMA_SIZE 4
			#define MLXSW_I2C_PREP_SIZE (MLXSW_I2C_ADDR_WIDTH + 28)
			#define MLXSW_I2C_MBOX_SIZE 20
			#define MLXSW_I2C_MBOX_OUT_PARAM_OFF 12
			#define MLXSW_I2C_MAX_BUFF_SIZE 32
			#define MLXSW_I2C_MBOX_OFFSET_BITS 20
			#define MLXSW_I2C_MBOX_SIZE_BITS 12
			#define MLXSW_I2C_ADDR_BUF_SIZE 4
			#define MLXSW_I2C_BLK_MAX 32
			#define MLXSW_I2C_RETRY 5
			#define MLXSW_I2C_TIMEOUT_MSECS 5000

			/**
			* struct mlxsw_i2c - device private data:
			* @cmd.mb_size_in: input mailbox size;
			* @cmd.mb_off_in: input mailbox offset in register space;
			* @cmd.mb_size_out: output mailbox size;
			* @cmd.mb_off_out: output mailbox offset in register space;
			* @cmd.lock: command execution lock;
			* @dev: I2C device;
			* @core: switch core pointer;
			* @bus_info: bus info block;
			*/
			struct mlxsw_i2c {
			struct {
			u32 mb_size_in;
			u32 mb_off_in;
			u32 mb_size_out;
			u32 mb_off_out;
			struct mutex lock;
			} cmd;
			struct device *dev;
			struct mlxsw_core *core;
			struct mlxsw_bus_info bus_info;
			};

			#define MLXSW_I2C_READ_MSG(_client, _addr_buf, _buf, _len) { \
			{ .addr = (_client)->addr, \
			.buf = (_addr_buf), \
			.len = MLXSW_I2C_ADDR_BUF_SIZE, \
			.flags = 0 }, \
			{ .addr = (_client)->addr, \
			.buf = (_buf), \
			.len = (_len), \
			.flags = I2C_M_RD } }

			#define MLXSW_I2C_WRITE_MSG(_client, _buf, _len) \
			{ .addr = (_client)->addr, \
			.buf = (u8 *)(_buf), \
			.len = (_len), \
			.flags = 0 }

			/* Routine converts in and out mail boxes offset and size. */
			static inline void
			mlxsw_i2c_convert_mbox(struct mlxsw_i2c mlxsw_i2c, u8 buf)
			{
			u32 tmp;

			/* Local in/out mailboxes: 20 bits for offset, 12 for size */
			tmp = be32_to_cpup((__be32 *) buf);
			mlxsw_i2c->cmd.mb_off_in = tmp &
			GENMASK(MLXSW_I2C_MBOX_OFFSET_BITS - 1, 0);
			mlxsw_i2c->cmd.mb_size_in = (tmp & GENMASK(31,
			MLXSW_I2C_MBOX_OFFSET_BITS)) >>
			MLXSW_I2C_MBOX_OFFSET_BITS;

			tmp = be32_to_cpup((__be32 *) (buf + MLXSW_I2C_ADDR_WIDTH));
			mlxsw_i2c->cmd.mb_off_out = tmp &
			GENMASK(MLXSW_I2C_MBOX_OFFSET_BITS - 1, 0);
			mlxsw_i2c->cmd.mb_size_out = (tmp & GENMASK(31,
			MLXSW_I2C_MBOX_OFFSET_BITS)) >>
			MLXSW_I2C_MBOX_OFFSET_BITS;
			}

			/* Routine obtains register size from mail box buffer. */
			static inline int mlxsw_i2c_get_reg_size(u8 *in_mbox)
			{
			u16 tmp = be16_to_cpup((__be16 *) (in_mbox + MLXSW_I2C_TLV_HDR_SIZE));

			return (tmp & 0x7ff) * 4 + MLXSW_I2C_TLV_HDR_SIZE;
			}

			/* Routine sets I2C device internal offset in the transaction buffer. */
			static inline void mlxsw_i2c_set_slave_addr(u8 *buf, u32 off)
			{
			__be32 val = (__be32 ) buf;

			*val = htonl(off);
			}

			/* Routine waits until go bit is cleared. */
			static int mlxsw_i2c_wait_go_bit(struct i2c_client *client,
			struct mlxsw_i2c mlxsw_i2c, u8 p_status)
			{
			u8 addr_buf[MLXSW_I2C_ADDR_BUF_SIZE];
			u8 buf[MLXSW_I2C_READ_SEMA_SIZE];
			int len = MLXSW_I2C_READ_SEMA_SIZE;
			struct i2c_msg read_sema[] =
			MLXSW_I2C_READ_MSG(client, addr_buf, buf, len);
			bool wait_done = false;
			unsigned long end;
			int i = 0, err;

			mlxsw_i2c_set_slave_addr(addr_buf, MLXSW_I2C_CIR2_OFF_STATUS);

			end = jiffies + msecs_to_jiffies(MLXSW_I2C_TIMEOUT_MSECS);
			do {
			u32 ctrl;

			err = i2c_transfer(client->adapter, read_sema,
			ARRAY_SIZE(read_sema));

			ctrl = be32_to_cpu((__be32 ) buf);
			if (err == ARRAY_SIZE(read_sema)) {
			if (!(ctrl & MLXSW_I2C_GO_BIT)) {
			wait_done = true;
			*p_status = ctrl >>
			MLXSW_I2C_CIR_CTRL_STATUS_SHIFT;
			break;
			}
			}
			cond_resched();
			} while ((time_before(jiffies, end)) \|\| (i++ < MLXSW_I2C_RETRY));

			if (wait_done) {
			if (*p_status)
			err = -EIO;
			} else {
			return -ETIMEDOUT;
			}

			return err > 0 ? 0 : err;
			}

			/* Routine posts a command to ASIC though mail box. */
			static int mlxsw_i2c_write_cmd(struct i2c_client *client,
			struct mlxsw_i2c *mlxsw_i2c,
			int immediate)
			{
			__be32 push_cmd_buf[MLXSW_I2C_PUSH_CMD_SIZE / 4] = {
			0, cpu_to_be32(MLXSW_I2C_PUSH_IMM_CMD)
			};
			__be32 prep_cmd_buf[MLXSW_I2C_PREP_SIZE / 4] = {
			0, 0, 0, 0, 0, 0,
			cpu_to_be32(client->adapter->nr & 0xffff),
			cpu_to_be32(MLXSW_I2C_SET_IMM_CMD)
			};
			struct i2c_msg push_cmd =
			MLXSW_I2C_WRITE_MSG(client, push_cmd_buf,
			MLXSW_I2C_PUSH_CMD_SIZE);
			struct i2c_msg prep_cmd =
			MLXSW_I2C_WRITE_MSG(client, prep_cmd_buf, MLXSW_I2C_PREP_SIZE);
			int err;

			if (!immediate) {
			push_cmd_buf[1] = cpu_to_be32(MLXSW_I2C_PUSH_CMD);
			prep_cmd_buf[7] = cpu_to_be32(MLXSW_I2C_SET_CMD);
			}
			mlxsw_i2c_set_slave_addr((u8 *)prep_cmd_buf,
			MLXSW_I2C_CIR2_BASE);
			mlxsw_i2c_set_slave_addr((u8 *)push_cmd_buf,
			MLXSW_I2C_CIR2_OFF_STATUS);

			/* Prepare Command Interface Register for transaction */
			err = i2c_transfer(client->adapter, &prep_cmd, 1);
			if (err < 0)
			return err;
			else if (err != 1)
			return -EIO;

			/* Write out Command Interface Register GO bit to push transaction */
			err = i2c_transfer(client->adapter, &push_cmd, 1);
			if (err < 0)
			return err;
			else if (err != 1)
			return -EIO;

			return 0;
			}

			/* Routine obtains mail box offsets from ASIC register space. */
			static int mlxsw_i2c_get_mbox(struct i2c_client *client,
			struct mlxsw_i2c *mlxsw_i2c)
			{
			u8 addr_buf[MLXSW_I2C_ADDR_BUF_SIZE];
			u8 buf[MLXSW_I2C_MBOX_SIZE];
			struct i2c_msg mbox_cmd[] =
			MLXSW_I2C_READ_MSG(client, addr_buf, buf, MLXSW_I2C_MBOX_SIZE);
			int err;

			/* Read mail boxes offsets. */
			mlxsw_i2c_set_slave_addr(addr_buf, MLXSW_I2C_CIR2_BASE);
			err = i2c_transfer(client->adapter, mbox_cmd, 2);
			if (err != 2) {
			dev_err(&client->dev, "Could not obtain mail boxes\n");
			if (!err)
			return -EIO;
			else
			return err;
			}

			/* Convert mail boxes. */
			mlxsw_i2c_convert_mbox(mlxsw_i2c, &buf[MLXSW_I2C_MBOX_OUT_PARAM_OFF]);

			return err;
			}

			/* Routine sends I2C write transaction to ASIC device. */
			static int
			mlxsw_i2c_write(struct device dev, size_t in_mbox_size, u8 in_mbox, int num,
			u8 *p_status)
			{
			struct i2c_client *client = to_i2c_client(dev);
			struct mlxsw_i2c *mlxsw_i2c = i2c_get_clientdata(client);
			unsigned long timeout = msecs_to_jiffies(MLXSW_I2C_TIMEOUT_MSECS);
			u8 tran_buf[MLXSW_I2C_MAX_BUFF_SIZE + MLXSW_I2C_ADDR_BUF_SIZE];
			int off = mlxsw_i2c->cmd.mb_off_in, chunk_size, i, j;
			unsigned long end;
			struct i2c_msg write_tran =
			MLXSW_I2C_WRITE_MSG(client, tran_buf, MLXSW_I2C_PUSH_CMD_SIZE);
			int err;

			for (i = 0; i < num; i++) {
			chunk_size = (in_mbox_size > MLXSW_I2C_BLK_MAX) ?
			MLXSW_I2C_BLK_MAX : in_mbox_size;
			write_tran.len = MLXSW_I2C_ADDR_WIDTH + chunk_size;
			mlxsw_i2c_set_slave_addr(tran_buf, off);
			memcpy(&tran_buf[MLXSW_I2C_ADDR_BUF_SIZE], in_mbox +
			chunk_size * i, chunk_size);

			j = 0;
			end = jiffies + timeout;
			do {
			err = i2c_transfer(client->adapter, &write_tran, 1);
			if (err == 1)
			break;

			cond_resched();
			} while ((time_before(jiffies, end)) \|\|
			(j++ < MLXSW_I2C_RETRY));

			if (err != 1) {
			if (!err)
			err = -EIO;
			return err;
			}

			off += chunk_size;
			in_mbox_size -= chunk_size;
			}

			/* Prepare and write out Command Interface Register for transaction. */
			err = mlxsw_i2c_write_cmd(client, mlxsw_i2c, 0);
			if (err) {
			dev_err(&client->dev, "Could not start transaction");
			return -EIO;
			}

			/* Wait until go bit is cleared. */
			err = mlxsw_i2c_wait_go_bit(client, mlxsw_i2c, p_status);
			if (err) {
			dev_err(&client->dev, "HW semaphore is not released");
			return err;
			}

			/* Validate transaction completion status. */
			if (*p_status) {
			dev_err(&client->dev, "Bad transaction completion status %x\n",
			*p_status);
			return -EIO;
			}

			return err > 0 ? 0 : err;
			}

			/* Routine executes I2C command. */
			static int
			mlxsw_i2c_cmd(struct device dev, size_t in_mbox_size, u8 in_mbox,
			size_t out_mbox_size, u8 out_mbox, u8 status)
			{
			struct i2c_client *client = to_i2c_client(dev);
			struct mlxsw_i2c *mlxsw_i2c = i2c_get_clientdata(client);
			unsigned long timeout = msecs_to_jiffies(MLXSW_I2C_TIMEOUT_MSECS);
			u8 tran_buf[MLXSW_I2C_ADDR_BUF_SIZE];
			int num, chunk_size, reg_size, i, j;
			int off = mlxsw_i2c->cmd.mb_off_out;
			unsigned long end;
			struct i2c_msg read_tran[] =
			MLXSW_I2C_READ_MSG(client, tran_buf, NULL, 0);
			int err;

			WARN_ON(in_mbox_size % sizeof(u32) \|\| out_mbox_size % sizeof(u32));

			reg_size = mlxsw_i2c_get_reg_size(in_mbox);
			num = reg_size / MLXSW_I2C_BLK_MAX;
			if (reg_size % MLXSW_I2C_BLK_MAX)
			num++;

			if (mutex_lock_interruptible(&mlxsw_i2c->cmd.lock) < 0) {
			dev_err(&client->dev, "Could not acquire lock");
			return -EINVAL;
			}

			err = mlxsw_i2c_write(dev, reg_size, in_mbox, num, status);
			if (err)
			goto cmd_fail;

			/* No out mailbox is case of write transaction. */
			if (!out_mbox) {
			mutex_unlock(&mlxsw_i2c->cmd.lock);
			return 0;
			}

			/* Send read transaction to get output mailbox content. */
			read_tran[1].buf = out_mbox;
			for (i = 0; i < num; i++) {
			chunk_size = (reg_size > MLXSW_I2C_BLK_MAX) ?
			MLXSW_I2C_BLK_MAX : reg_size;
			read_tran[1].len = chunk_size;
			mlxsw_i2c_set_slave_addr(tran_buf, off);

			j = 0;
			end = jiffies + timeout;
			do {
			err = i2c_transfer(client->adapter, read_tran,
			ARRAY_SIZE(read_tran));
			if (err == ARRAY_SIZE(read_tran))
			break;

			cond_resched();
			} while ((time_before(jiffies, end)) \|\|
			(j++ < MLXSW_I2C_RETRY));

			if (err != ARRAY_SIZE(read_tran)) {
			if (!err)
			err = -EIO;

			goto cmd_fail;
			}

			off += chunk_size;
			reg_size -= chunk_size;
			read_tran[1].buf += chunk_size;
			}

			mutex_unlock(&mlxsw_i2c->cmd.lock);

			return 0;

			cmd_fail:
			mutex_unlock(&mlxsw_i2c->cmd.lock);
			return err;
			}

			static int mlxsw_i2c_cmd_exec(void *bus_priv, u16 opcode, u8 opcode_mod,
			u32 in_mod, bool out_mbox_direct,
			char *in_mbox, size_t in_mbox_size,
			char *out_mbox, size_t out_mbox_size,
			u8 *status)
			{
			struct mlxsw_i2c *mlxsw_i2c = bus_priv;

			return mlxsw_i2c_cmd(mlxsw_i2c->dev, in_mbox_size, in_mbox,
			out_mbox_size, out_mbox, status);
			}

			static bool mlxsw_i2c_skb_transmit_busy(void *bus_priv,
			const struct mlxsw_tx_info *tx_info)
			{
			return false;
			}

			static int mlxsw_i2c_skb_transmit(void bus_priv, struct sk_buff skb,
			const struct mlxsw_tx_info *tx_info)
			{
			return 0;
			}

			static int
			mlxsw_i2c_init(void bus_priv, struct mlxsw_core mlxsw_core,
			const struct mlxsw_config_profile *profile,
			struct mlxsw_res *resources)
			{
			struct mlxsw_i2c *mlxsw_i2c = bus_priv;

			mlxsw_i2c->core = mlxsw_core;

			return 0;
			}

			static void mlxsw_i2c_fini(void *bus_priv)
			{
			struct mlxsw_i2c *mlxsw_i2c = bus_priv;

			mlxsw_i2c->core = NULL;
			}

			static const struct mlxsw_bus mlxsw_i2c_bus = {
			.kind = "i2c",
			.init = mlxsw_i2c_init,
			.fini = mlxsw_i2c_fini,
			.skb_transmit_busy = mlxsw_i2c_skb_transmit_busy,
			.skb_transmit = mlxsw_i2c_skb_transmit,
			.cmd_exec = mlxsw_i2c_cmd_exec,
			};

			static int mlxsw_i2c_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
			{
			struct mlxsw_i2c *mlxsw_i2c;
			u8 status;
			int err;

			mlxsw_i2c = devm_kzalloc(&client->dev, sizeof(*mlxsw_i2c), GFP_KERNEL);
			if (!mlxsw_i2c)
			return -ENOMEM;

			i2c_set_clientdata(client, mlxsw_i2c);
			mutex_init(&mlxsw_i2c->cmd.lock);

			/* In order to use mailboxes through the i2c, special area is reserved
			* on the i2c address space that can be used for input and output
			* mailboxes. Such mailboxes are called local mailboxes. When using a
			* local mailbox, software should specify 0 as the Input/Output
			* parameters. The location of the Local Mailbox addresses on the i2c
			* space can be retrieved through the QUERY_FW command.
			* For this purpose QUERY_FW is to be issued with opcode modifier equal
			* 0x01. For such command the output parameter is an immediate value.
			* Here QUERY_FW command is invoked for ASIC probing and for getting
			* local mailboxes addresses from immedate output parameters.
			*/

			/* Prepare and write out Command Interface Register for transaction */
			err = mlxsw_i2c_write_cmd(client, mlxsw_i2c, 1);
			if (err) {
			dev_err(&client->dev, "Could not start transaction");
			goto errout;
			}

			/* Wait until go bit is cleared. */
			err = mlxsw_i2c_wait_go_bit(client, mlxsw_i2c, &status);
			if (err) {
			dev_err(&client->dev, "HW semaphore is not released");
			goto errout;
			}

			/* Validate transaction completion status. */
			if (status) {
			dev_err(&client->dev, "Bad transaction completion status %x\n",
			status);
			err = -EIO;
			goto errout;
			}

			/* Get mailbox offsets. */
			err = mlxsw_i2c_get_mbox(client, mlxsw_i2c);
			if (err < 0) {
			dev_err(&client->dev, "Fail to get mailboxes\n");
			goto errout;
			}

			dev_info(&client->dev, "%s mb size=%x off=0x%08x out mb size=%x off=0x%08x\n",
			id->name, mlxsw_i2c->cmd.mb_size_in,
			mlxsw_i2c->cmd.mb_off_in, mlxsw_i2c->cmd.mb_size_out,
			mlxsw_i2c->cmd.mb_off_out);

			/* Register device bus. */
			mlxsw_i2c->bus_info.device_kind = id->name;
			mlxsw_i2c->bus_info.device_name = client->name;
			mlxsw_i2c->bus_info.dev = &client->dev;
			mlxsw_i2c->dev = &client->dev;

			err = mlxsw_core_bus_device_register(&mlxsw_i2c->bus_info,
			&mlxsw_i2c_bus, mlxsw_i2c);
			if (err) {
			dev_err(&client->dev, "Fail to register core bus\n");
			return err;
			}

			return 0;

			errout:
			i2c_set_clientdata(client, NULL);

			return err;
			}

			static int mlxsw_i2c_remove(struct i2c_client *client)
			{
			struct mlxsw_i2c *mlxsw_i2c = i2c_get_clientdata(client);

			mlxsw_core_bus_device_unregister(mlxsw_i2c->core);
			mutex_destroy(&mlxsw_i2c->cmd.lock);

			return 0;
			}

			int mlxsw_i2c_driver_register(struct i2c_driver *i2c_driver)
			{
			i2c_driver->probe = mlxsw_i2c_probe;
			i2c_driver->remove = mlxsw_i2c_remove;
			return i2c_add_driver(i2c_driver);
			}
			EXPORT_SYMBOL(mlxsw_i2c_driver_register);

			void mlxsw_i2c_driver_unregister(struct i2c_driver *i2c_driver)
			{
			i2c_del_driver(i2c_driver);
			}
			EXPORT_SYMBOL(mlxsw_i2c_driver_unregister);

			MODULE_AUTHOR("Vadim Pasternak <vadimp@mellanox.com>");
			MODULE_DESCRIPTION("Mellanox switch I2C interface driver");
			MODULE_LICENSE("Dual BSD/GPL");

drivers/net/ethernet/mellanox/mlxsw/i2c.h

0 → 100644

+60 −0

Original line number	Original line	Diff line number	Diff line
			/*
			* drivers/net/ethernet/mellanox/mlxsw/i2c.h
			* Copyright (c) 2016 Mellanox Technologies. All rights reserved.
			* Copyright (c) 2016 Vadim Pasternak <vadimp@mellanox.com>
			*
			* Redistribution and use in source and binary forms, with or without
			* modification, are permitted provided that the following conditions are met:
			*
			* 1. Redistributions of source code must retain the above copyright
			* notice, this list of conditions and the following disclaimer.
			* 2. Redistributions in binary form must reproduce the above copyright
			* notice, this list of conditions and the following disclaimer in the
			* documentation and/or other materials provided with the distribution.
			* 3. Neither the names of the copyright holders nor the names of its
			* contributors may be used to endorse or promote products derived from
			* this software without specific prior written permission.
			*
			* Alternatively, this software may be distributed under the terms of the
			* GNU General Public License ("GPL") version 2 as published by the Free
			* Software Foundation.
			*
			* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
			* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
			* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
			* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
			* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
			* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
			* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
			* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
			* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
			* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
			* POSSIBILITY OF SUCH DAMAGE.
			*/

			#ifndef _MLXSW_I2C_H
			#define _MLXSW_I2C_H

			#include <linux/i2c.h>

			#if IS_ENABLED(CONFIG_MLXSW_I2C)

			int mlxsw_i2c_driver_register(struct i2c_driver *i2c_driver);
			void mlxsw_i2c_driver_unregister(struct i2c_driver *i2c_driver);

			#else

			static inline int
			mlxsw_i2c_driver_register(struct i2c_driver *i2c_driver)
			{
			return -ENODEV;
			}

			static inline void
			mlxsw_i2c_driver_unregister(struct i2c_driver *i2c_driver)
			{
			}

			#endif

			#endif