From: Vadim Pasternak <vadimp@xxxxxxxxxxxx> Device driver for Mellanox I2C controller logic, implemented in Lattice CPLD device. Device supports: - Master mode - One physical bus - Polling mode The Kconfig currently controlling compilation of this code is: drivers/i2c/busses/Kconfig:config I2C_MLXCPLD Signed-off-by: Michael Shych <michaelsh@xxxxxxxxxxxx> Signed-off-by: Vadim Pasternak <vadimp@xxxxxxxxxxxx> Reviewed-by: Jiri Pirko <jiri@xxxxxxxxxxxx> v1->v2 Fixes added by Vadim: - Put new record in Makefile in alphabetic order; - Remove http://www.mellanox.com from MAINTAINERS record; --- Documentation/i2c/busses/i2c-mlxcpld | 47 +++ MAINTAINERS | 8 + drivers/i2c/busses/Kconfig | 12 + drivers/i2c/busses/Makefile | 1 + drivers/i2c/busses/i2c-mlxcpld.c | 597 +++++++++++++++++++++++++++++++++++ 5 files changed, 665 insertions(+) create mode 100644 Documentation/i2c/busses/i2c-mlxcpld create mode 100644 drivers/i2c/busses/i2c-mlxcpld.c diff --git a/Documentation/i2c/busses/i2c-mlxcpld b/Documentation/i2c/busses/i2c-mlxcpld new file mode 100644 index 0000000..0f8678a --- /dev/null +++ b/Documentation/i2c/busses/i2c-mlxcpld @@ -0,0 +1,47 @@ +Driver i2c-mlxcpld + +Author: Michael Shych <michaelsh@xxxxxxxxxxxx> + +This is a for Mellanox I2C controller logic, implemented in Lattice CPLD +device. +Device supports: + - Master mode. + - One physical bus. + - Polling mode. + +This controller is equipped within the next Mellanox systems: +"msx6710", "msx6720", "msb7700", "msn2700", "msx1410", "msn2410", "msb7800", +"msn2740", "msn2100". + +The next transaction types are supported: + - Receive Byte/Block. + - Send Byte/Block. + - Read Byte/Block. + - Write Byte/Block. + +Registers: +CTRL 0x1 - control reg. + Resets all the registers. +HALF_CYC 0x4 - cycle reg. + Configure the width of I2C SCL half clock cycle (in 4 LPC_CLK + units). +I2C_HOLD 0x5 - hold reg. + OE (output enable) is delayed by value set to this register + (in LPC_CLK units) +CMD 0x6 - command reg. + Bit 7(lsb), 0 = write, 1 = read. + Bits [6:0] - the 7bit Address of the I2C device. + It should be written last as it triggers an I2C transaction. +NUM_DATA 0x7 - data size reg. + Number of address bytes to write in read transaction +NUM_ADDR 0x8 - address reg. + Number of address bytes to write in read transaction. +STATUS 0x9 - status reg. + Bit 0 - transaction is completed. + Bit 4 - ACK/NACK. +DATAx 0xa - 0x54 - 68 bytes data buffer regs. + For write transaction address is specified in four first bytes + (DATA1 - DATA4), data starting from DATA4. + For read transactions address is send in separate transaction and + specified in four first bytes (DATA0 - DATA3). Data is reading + starting from DATA0. diff --git a/MAINTAINERS b/MAINTAINERS index 6781a3f..dc31231 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -7667,6 +7667,14 @@ W: http://www.mellanox.com Q: http://patchwork.ozlabs.org/project/netdev/list/ F: drivers/net/ethernet/mellanox/mlxsw/ +MELLANOX MLXCPLD I2C DRIVER +M: Vadim Pasternak <vadimp@xxxxxxxxxxxx> +M: Michael Shych <michaelsh@xxxxxxxxxxxx> +L: linux-i2c@xxxxxxxxxxxxxxx +S: Supported +F: drivers/i2c/busses/i2c-mlxcpld.c +F: Documentation/i2c/busses/i2c-mlxcpld + SOFT-ROCE DRIVER (rxe) M: Moni Shoua <monis@xxxxxxxxxxxx> L: linux-rdma@xxxxxxxxxxxxxxx diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig index 5c3993b..1126142a 100644 --- a/drivers/i2c/busses/Kconfig +++ b/drivers/i2c/busses/Kconfig @@ -1203,4 +1203,16 @@ config I2C_OPAL This driver can also be built as a module. If so, the module will be called as i2c-opal. +config I2C_MLXCPLD + tristate "Mellanox I2C driver" + depends on X86_64 + default y + help + This exposes the Mellanox platform I2C busses to the linux I2C layer + for X86 based systems. + Controller is implemented as CPLD logic. + + This driver can also be built as a module. If so, the module will be + called as i2c-mlxcpld. + endmenu diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile index 37f2819..4df3578 100644 --- a/drivers/i2c/busses/Makefile +++ b/drivers/i2c/busses/Makefile @@ -118,5 +118,6 @@ obj-$(CONFIG_I2C_PCA_ISA) += i2c-pca-isa.o obj-$(CONFIG_I2C_SIBYTE) += i2c-sibyte.o obj-$(CONFIG_I2C_XGENE_SLIMPRO) += i2c-xgene-slimpro.o obj-$(CONFIG_SCx200_ACB) += scx200_acb.o +obj-$(CONFIG_I2C_MLXCPLD) += i2c-mlxcpld.o ccflags-$(CONFIG_I2C_DEBUG_BUS) := -DDEBUG diff --git a/drivers/i2c/busses/i2c-mlxcpld.c b/drivers/i2c/busses/i2c-mlxcpld.c new file mode 100644 index 0000000..dd62190 --- /dev/null +++ b/drivers/i2c/busses/i2c-mlxcpld.c @@ -0,0 +1,597 @@ +/* + * drivers/i2c/busses/i2c-mlxcpld.c + * Copyright (c) 2016 Mellanox Technologies. All rights reserved. + * Copyright (c) 2016 Michael Shych <michaels@xxxxxxxxxxxx> + * + * 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/delay.h> +#include <linux/i2c.h> +#include <linux/init.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/platform_device.h> + +/* General defines */ +#define MLXPLAT_CPLD_LPC_I2C_BASE_ADRR 0x2000 +#define MLXCPLD_I2C_DEVICE_NAME "i2c_mlxcpld" +#define MLXCPLD_I2C_VALID_FLAG (I2C_M_RECV_LEN | I2C_M_RD) +#define MLXCPLD_I2C_BUS_NUM 1 +#define MLXCPLD_I2C_DATA_REG_SZ 36 +#define MLXCPLD_I2C_MAX_ADDR_LEN 4 +#define MLXCPLD_I2C_RETR_NUM 2 +#define MLXCPLD_I2C_XFER_TO 500000 /* msec */ +#define MLXCPLD_I2C_POLL_TIME 2000 /* msec */ + +/* LPC I2C registers */ +#define MLXCPLD_LPCI2C_LPF_REG 0x0 +#define MLXCPLD_LPCI2C_CTRL_REG 0x1 +#define MLXCPLD_LPCI2C_HALF_CYC_REG 0x4 +#define MLXCPLD_LPCI2C_I2C_HOLD_REG 0x5 +#define MLXCPLD_LPCI2C_CMD_REG 0x6 +#define MLXCPLD_LPCI2C_NUM_DAT_REG 0x7 +#define MLXCPLD_LPCI2C_NUM_ADDR_REG 0x8 +#define MLXCPLD_LPCI2C_STATUS_REG 0x9 +#define MLXCPLD_LPCI2C_DATA_REG 0xa + +/* LPC I2C masks and parametres */ +#define MLXCPLD_LPCI2C_RST_SEL_MASK 0x1 +#define MLXCPLD_LPCI2C_LPF_DFLT 0x2 +#define MLXCPLD_LPCI2C_HALF_CYC_100 0x1f +#define MLXCPLD_LPCI2C_I2C_HOLD_100 0x3c +#define MLXCPLD_LPCI2C_TRANS_END 0x1 +#define MLXCPLD_LPCI2C_STATUS_NACK 0x10 +#define MLXCPLD_LPCI2C_ERR_IND -1 +#define MLXCPLD_LPCI2C_NO_IND 0 +#define MLXCPLD_LPCI2C_ACK_IND 1 +#define MLXCPLD_LPCI2C_NACK_IND 2 + +/** + * mlxcpld_i2c_regs - controller registers: + * @half_cyc - half cycle register + * @i2c_hold - hold register + * @config - config register + * @cmd - command register + * @cmd - status register + * @data - register data +**/ +struct mlxcpld_i2c_regs { + u8 half_cyc; + u8 i2c_hold; + u8 config; + u8 cmd; + u8 status; + u8 data[MLXCPLD_I2C_DATA_REG_SZ]; +}; + +/** + * mlxcpld_i2c_curr_transf - current transaction parameters: + * @cmd - command + * @addr_width - address width + * @data_len - data length + * @cmd - command register + * @msg_num - message number + * @msg - pointer to message buffer +**/ +struct mlxcpld_i2c_curr_transf { + u8 cmd; + u8 addr_width; + u8 data_len; + u8 msg_num; + struct i2c_msg *msg; +}; + +/** + * mlxcpld_i2c_priv - private controller data: + * @lpc_gen_dec_reg - register space + * @adap - i2c adapter + * @dev_id - device id + * @base_addr - base IO address + * @poll_time - polling time + * @xfer_to - transfer timeout in microsec (500000) + * @retr_num - access retries number (2) + * @block_sz - maximum data block size (36), + * @lock - bus access lock + * @lpc_i2c_res - lpc i2c resourse + * @lpc_cpld_res - lpc cpld resource + * @xfer - current i2c transfer block + * @pdev - platform device +**/ +struct mlxcpld_i2c_priv { + struct i2c_adapter adap; + u16 dev_id; + u16 base_addr; + u16 poll_time; + int xfer_to; + int retr_num; + int block_sz; + struct mutex lock; + struct mlxcpld_i2c_curr_transf xfer; + struct platform_device *pdev; +}; +struct platform_device *mlxcpld_i2c_plat_dev; + +static void mlxcpld_i2c_lpc_write_buf(u8 *data, u8 len, u32 addr) +{ + int i, nbyte, ndword; + + nbyte = len % 4; + ndword = len / 4; + for (i = 0; i < ndword; i++) + outl(*((u32 *)data + i), addr + i * 4); + ndword *= 4; + addr += ndword; + data += ndword; + for (i = 0; i < nbyte; i++) + outb(*(data + i), addr + i); +} + +static void mlxcpld_i2c_lpc_read_buf(u8 *data, u8 len, u32 addr) +{ + int i, nbyte, ndword; + + nbyte = len % 4; + ndword = len / 4; + for (i = 0; i < ndword; i++) + *((u32 *)data + i) = inl(addr + i * 4); + ndword *= 4; + addr += ndword; + data += ndword; + for (i = 0; i < nbyte; i++) + *(data + i) = inb(addr + i); +} + +static void mlxcpld_i2c_read_comm(struct mlxcpld_i2c_priv *priv, u8 offs, + u8 *data, u8 datalen) +{ + u32 addr = priv->base_addr + offs; + + switch (datalen) { + case 1: + *(data) = inb(addr); + break; + case 2: + *((u16 *)data) = inw(addr); + break; + case 3: + *((u16 *)data) = inw(addr); + *(data + 2) = inb(addr + 2); + break; + case 4: + *((u32 *)data) = inl(addr); + break; + default: + mlxcpld_i2c_lpc_read_buf(data, datalen, addr); + break; + } +} + +static void mlxcpld_i2c_write_comm(struct mlxcpld_i2c_priv *priv, u8 offs, + u8 *data, u8 datalen) +{ + u32 addr = priv->base_addr + offs; + + switch (datalen) { + case 1: + outb(*(data), addr); + break; + case 2: + outw(*((u16 *)data), addr); + break; + case 3: + outw(*((u16 *)data), addr); + outb(*(data + 2), addr + 2); + break; + case 4: + outl(*((u32 *)data), addr); + break; + default: + mlxcpld_i2c_lpc_write_buf(data, datalen, addr); + break; + } +} + +/* Check validity of current i2c message and all transfer. + * Calculate also coomon length of all i2c messages in transfer. + */ +static int mlxcpld_i2c_invalid_len(struct mlxcpld_i2c_priv *priv, + const struct i2c_msg *msg, u8 *comm_len) +{ + u8 max_len = msg->flags == I2C_M_RD ? priv->block_sz - + MLXCPLD_I2C_MAX_ADDR_LEN : priv->block_sz; + + if (msg->len < 0 || msg->len > max_len) + return -EINVAL; + + *comm_len += msg->len; + if (*comm_len > priv->block_sz) + return -EINVAL; + else + return 0; +} + +/* Check validity of received i2c messages parameters. + * Returns 0 if OK, other - in case of invalid parameters + * or common length of data that should be passed to CPLD + */ +static int mlxcpld_i2c_check_msg_params(struct mlxcpld_i2c_priv *priv, + struct i2c_msg *msgs, int num, + u8 *comm_len) +{ + int i; + + if (!num) { + dev_err(&priv->pdev->dev, "Incorrect 0 num of messages\n"); + return -EINVAL; + } + + if (unlikely(msgs[0].addr > 0x7f)) { + dev_err(&priv->pdev->dev, "Invalid address 0x%03x\n", + msgs[0].addr); + return -EINVAL; + } + + for (i = 0; i < num; ++i) { + if (unlikely(!msgs[i].buf)) { + dev_err(&priv->pdev->dev, "Invalid buf in msg[%d]\n", + i); + return -EINVAL; + } + if (unlikely(msgs[0].addr != msgs[i].addr)) { + dev_err(&priv->pdev->dev, "Invalid addr in msg[%d]\n", + i); + return -EINVAL; + } + if (unlikely(mlxcpld_i2c_invalid_len(priv, &msgs[i], + comm_len))) { + dev_err(&priv->pdev->dev, "Invalid len %d msg[%d], addr 0x%x, lag %u\n", + msgs[i].len, i, msgs[i].addr, msgs[i].flags); + return -EINVAL; + } + } + + return 0; +} + +/* Check if transfer is completed and status of operation. + * Returns 0 - transfer completed (both ACK or NACK), + * negative - transfer isn't finished. + */ +static int mlxcpld_i2c_check_status(struct mlxcpld_i2c_priv *priv, int *status) +{ + u8 val; + + mlxcpld_i2c_read_comm(priv, MLXCPLD_LPCI2C_STATUS_REG, &val, 1); + + if (val & MLXCPLD_LPCI2C_TRANS_END) { + if (val & MLXCPLD_LPCI2C_STATUS_NACK) + /* The slave is unable to accept the data. No such + * slave, command not understood, or unable to accept + * any more data. + */ + *status = MLXCPLD_LPCI2C_NACK_IND; + else + *status = MLXCPLD_LPCI2C_ACK_IND; + return 0; + } + *status = MLXCPLD_LPCI2C_NO_IND; + + return -EIO; +} + +static void mlxcpld_i2c_set_transf_data(struct mlxcpld_i2c_priv *priv, + struct i2c_msg *msgs, int num, + u8 comm_len) +{ + priv->xfer.msg = msgs; + priv->xfer.msg_num = num; + + /* + * All upper layers currently are never use transfer with more than + * 2 messages. Actually, it's also not so relevant in Mellanox systems + * because of HW limitation. Max size of transfer is o more than 20B + * in current x86 LPCI2C bridge. + */ + priv->xfer.cmd = (msgs[num - 1].flags & I2C_M_RD); + + if (priv->xfer.cmd == I2C_M_RD) { + if (comm_len == msgs[0].len) { + /* Special case of addr_width = 0 */ + priv->xfer.addr_width = 0; + priv->xfer.data_len = comm_len; + } else { + priv->xfer.addr_width = msgs[0].len; + priv->xfer.data_len = comm_len - priv->xfer.addr_width; + } + } else { + /* Width (I2C_NUM_ADDR reg) isn't used in write command. */ + priv->xfer.addr_width = 0; + priv->xfer.data_len = comm_len; + } +} + +/* Reset CPLD LPCI2C block */ +static void mlxcpld_i2c_reset(struct mlxcpld_i2c_priv *priv) +{ + u8 val; + + mutex_lock(&priv->lock); + mlxcpld_i2c_read_comm(priv, MLXCPLD_LPCI2C_CTRL_REG, &val, 1); + val &= ~MLXCPLD_LPCI2C_RST_SEL_MASK; + mlxcpld_i2c_write_comm(priv, MLXCPLD_LPCI2C_CTRL_REG, &val, 1); + mutex_unlock(&priv->lock); +} + +/* Make sure the CPLD is ready to start transmitting. + * Return 0 if it is, -EBUSY if it is not. + */ +static int mlxcpld_i2c_check_busy(struct mlxcpld_i2c_priv *priv) +{ + u8 val; + + mlxcpld_i2c_read_comm(priv, MLXCPLD_LPCI2C_STATUS_REG, &val, 1); + + if (val & MLXCPLD_LPCI2C_TRANS_END) + return 0; + + return -EIO; +} + +static int mlxcpld_i2c_wait_for_free(struct mlxcpld_i2c_priv *priv) +{ + int timeout = 0; + + do { + if (!mlxcpld_i2c_check_busy(priv)) + break; + usleep_range(priv->poll_time/2, priv->poll_time); + timeout += priv->poll_time; + } while (timeout < priv->xfer_to); + + if (timeout > priv->xfer_to) + return -ETIMEDOUT; + + return 0; +} + +/* + * Wait for master transfer to complete. + * It puts current process to sleep until we get interrupt or timeout expires. + * Returns the number of transferred or read bytes or error (<0). + */ +static int mlxcpld_i2c_wait_for_tc(struct mlxcpld_i2c_priv *priv) +{ + int status, i = 1, timeout = 0; + u8 datalen; + int err = 0; + + do { + usleep_range(priv->poll_time / 2, priv->poll_time); + if (!mlxcpld_i2c_check_status(priv, &status)) + break; + timeout += priv->poll_time; + } while (status == 0 && timeout < priv->xfer_to); + + switch (status) { + case MLXCPLD_LPCI2C_NO_IND: + return -ETIMEDOUT; + case MLXCPLD_LPCI2C_ACK_IND: + if (priv->xfer.cmd == I2C_M_RD) { + /* + * Actual read data len will be always the same as + * requested len. 0xff (line pull-up) will be returned + * if slave has no data to return. Thus don't read + * MLXCPLD_LPCI2C_NUM_DAT_REG reg from CPLD. + */ + err = datalen = priv->xfer.data_len; + if (priv->xfer.msg_num == 1) + i = 0; + + if (!priv->xfer.msg[i].buf) + err = -EINVAL; + else + mlxcpld_i2c_read_comm(priv, + MLXCPLD_LPCI2C_DATA_REG, + priv->xfer.msg[i].buf, + datalen); + } else { + err = priv->xfer.addr_width + priv->xfer.data_len; + } + break; + case MLXCPLD_LPCI2C_NACK_IND: + err = -EAGAIN; + break; + case MLXCPLD_LPCI2C_ERR_IND: + err = -EIO; + break; + default: + break; + } + + return err; +} + +static void mlxcpld_i2c_xfer_msg(struct mlxcpld_i2c_priv *priv) +{ + int i, len = 0; + u8 cmd; + + mlxcpld_i2c_write_comm(priv, MLXCPLD_LPCI2C_NUM_DAT_REG, + &priv->xfer.data_len, 1); + mlxcpld_i2c_write_comm(priv, MLXCPLD_LPCI2C_NUM_ADDR_REG, + &priv->xfer.addr_width, 1); + + for (i = 0; i < priv->xfer.msg_num; i++) { + if ((priv->xfer.msg[i].flags & I2C_M_RD) != I2C_M_RD) { + /* Don't write to CPLD buffer in read transaction */ + mlxcpld_i2c_write_comm(priv, MLXCPLD_LPCI2C_DATA_REG + + len, priv->xfer.msg[i].buf, + priv->xfer.msg[i].len); + len += priv->xfer.msg[i].len; + } + } + + /* Set target slave address with command for master transfer. + * It should be latest executed function before CPLD transaction. + */ + cmd = (priv->xfer.msg[0].addr << 1) | priv->xfer.cmd; + mlxcpld_i2c_write_comm(priv, MLXCPLD_LPCI2C_CMD_REG, &cmd, 1); +} + +/* Generic lpc-i2c transfer. + * Returns the number of processed messages or error (<0). + */ +static int mlxcpld_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, + int num) +{ + struct mlxcpld_i2c_priv *priv = i2c_get_adapdata(adap); + u8 comm_len = 0; + int err; + + err = mlxcpld_i2c_check_msg_params(priv, msgs, num, &comm_len); + if (err) { + dev_err(&priv->pdev->dev, "Incorrect message\n"); + return err; + } + + /* Check bus state */ + if (mlxcpld_i2c_wait_for_free(priv)) { + dev_err(&priv->pdev->dev, "LPCI2C bridge is busy\n"); + + /* + * Usually it means something serious has happened. + * We can not have unfinished previous transfer + * so it doesn't make any sense to try to stop it. + * Probably we were not able to recover from the + * previous error. + * The only reasonable thing - is soft reset. + */ + mlxcpld_i2c_reset(priv); + if (mlxcpld_i2c_check_busy(priv)) { + dev_err(&priv->pdev->dev, "LPCI2C bridge is busy after reset\n"); + return -EIO; + } + } + + mlxcpld_i2c_set_transf_data(priv, msgs, num, comm_len); + + mutex_lock(&priv->lock); + /* Do real transfer. Can't fail */ + mlxcpld_i2c_xfer_msg(priv); + /* Wait for transaction complete */ + err = mlxcpld_i2c_wait_for_tc(priv); + mutex_unlock(&priv->lock); + + return err < 0 ? err : num; +} + +static u32 mlxcpld_i2c_func(struct i2c_adapter *adap) +{ + return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | I2C_FUNC_SMBUS_BLOCK_DATA; +} + +static const struct i2c_algorithm mlxcpld_i2c_algo = { + .master_xfer = mlxcpld_i2c_xfer, + .functionality = mlxcpld_i2c_func +}; + +static struct i2c_adapter mlxcpld_i2c_adapter = { + .owner = THIS_MODULE, + .name = "i2c-mlxcpld", + .class = I2C_CLASS_HWMON | I2C_CLASS_SPD, + .algo = &mlxcpld_i2c_algo, +}; + +static int mlxcpld_i2c_probe(struct platform_device *pdev) +{ + struct mlxcpld_i2c_priv *priv; + int err; + + priv = devm_kzalloc(&pdev->dev, sizeof(struct mlxcpld_i2c_priv), + GFP_KERNEL); + if (!priv) + return -ENOMEM; + + mutex_init(&priv->lock); + platform_set_drvdata(pdev, priv); + priv->pdev = pdev; + priv->xfer_to = MLXCPLD_I2C_XFER_TO; + priv->retr_num = MLXCPLD_I2C_RETR_NUM; + priv->block_sz = MLXCPLD_I2C_DATA_REG_SZ; + priv->poll_time = MLXCPLD_I2C_POLL_TIME; + /* Register with i2c layer */ + priv->adap = mlxcpld_i2c_adapter; + priv->adap.dev.parent = &pdev->dev; + i2c_set_adapdata(&priv->adap, priv); + priv->adap.retries = priv->retr_num; + priv->adap.nr = MLXCPLD_I2C_BUS_NUM; + priv->adap.timeout = usecs_to_jiffies(priv->xfer_to); + + err = i2c_add_numbered_adapter(&priv->adap); + if (err) { + dev_err(&pdev->dev, "Failed to add %s adapter (%d)\n", + MLXCPLD_I2C_DEVICE_NAME, err); + goto fail_adapter; + } + + priv->base_addr = MLXPLAT_CPLD_LPC_I2C_BASE_ADRR; + + return 0; + +fail_adapter: + mutex_destroy(&priv->lock); + return err; +} + +static int mlxcpld_i2c_remove(struct platform_device *pdev) +{ + struct mlxcpld_i2c_priv *priv = platform_get_drvdata(pdev); + + i2c_del_adapter(&priv->adap); + mutex_destroy(&priv->lock); + + return 0; +} + +static struct platform_driver mlxcpld_i2c_driver = { + .probe = mlxcpld_i2c_probe, + .remove = mlxcpld_i2c_remove, + .driver = { + .name = MLXCPLD_I2C_DEVICE_NAME, + }, +}; + +module_platform_driver(mlxcpld_i2c_driver); + +MODULE_AUTHOR("Michael Shych (michaels@xxxxxxxxxxxx)"); +MODULE_DESCRIPTION("Mellanox I2C-CPLD controller driver"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:i2c-mlxcpld"); -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
