Re: [PATCH 2/4] Blackfin I2C/TWI driver: Add platform_resourceinterface to support multi-port TWI controllers

From: Jean Delvare
Date: Sat Nov 03 2007 - 08:29:57 EST

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In reply to: Bryan Wu: "[PATCH 2/4] Blackfin I2C/TWI driver: Add platform_resource interface to support multi-port TWI controllers"
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On Fri, 2 Nov 2007 14:24:22 +0800, Bryan Wu wrote:
> - Dynamic alloc the resource of TWI driver data according to board information
> - TWI register read/write accessor based on dynamic regs_base
> - Support TWI0/TWI1 for BF54x
>
> Signed-off-by: Bryan Wu <bryan.wu@xxxxxxxxxx>
> ---
> drivers/i2c/busses/i2c-bfin-twi.c | 269 +++++++++++++++++++++++--------------
> 1 files changed, 166 insertions(+), 103 deletions(-)
>
> diff --git a/drivers/i2c/busses/i2c-bfin-twi.c b/drivers/i2c/busses/i2c-bfin-twi.c
> index 6535852..e495454 100644
> --- a/drivers/i2c/busses/i2c-bfin-twi.c
> +++ b/drivers/i2c/busses/i2c-bfin-twi.c
> @@ -62,43 +62,66 @@ struct bfin_twi_iface {
> struct i2c_msg *pmsg;
> int msg_num;
> int cur_msg;
> + void __iomem *regs_base;
> };
>
> -static struct bfin_twi_iface twi_iface;
> +
> +#define DEFINE_TWI_REG(reg, off) \
> +static inline u16 read_##reg(struct bfin_twi_iface *iface) \
> + { return bfin_read16(iface->regs_base + off); } \
> +static inline void write_##reg(struct bfin_twi_iface *iface, u16 v) \
> + {bfin_write16(iface->regs_base + off, v); }

Coding style: missing space after opening curly brace.

Missing parentheses around "off" (twice).

> +
> +DEFINE_TWI_REG(CLKDIV, 0x00)
> +DEFINE_TWI_REG(CONTROL, 0x04)
> +DEFINE_TWI_REG(SLAVE_CTL, 0x08)
> +DEFINE_TWI_REG(SLAVE_STAT, 0x0C)
> +DEFINE_TWI_REG(SLAVE_ADDR, 0x10)
> +DEFINE_TWI_REG(MASTER_CTL, 0x14)
> +DEFINE_TWI_REG(MASTER_STAT, 0x18)
> +DEFINE_TWI_REG(MASTER_ADDR, 0x1C)
> +DEFINE_TWI_REG(INT_STAT, 0x20)
> +DEFINE_TWI_REG(INT_MASK, 0x24)
> +DEFINE_TWI_REG(FIFO_CTL, 0x28)
> +DEFINE_TWI_REG(FIFO_STAT, 0x2C)
> +DEFINE_TWI_REG(XMT_DATA8, 0x80)
> +DEFINE_TWI_REG(XMT_DATA16, 0x84)
> +DEFINE_TWI_REG(RCV_DATA8, 0x88)
> +DEFINE_TWI_REG(RCV_DATA16, 0x8C)
>
> static void bfin_twi_handle_interrupt(struct bfin_twi_iface *iface)
> {
> - unsigned short twi_int_status = bfin_read_TWI_INT_STAT();
> - unsigned short mast_stat = bfin_read_TWI_MASTER_STAT();
> + unsigned short twi_int_status = read_INT_STAT(iface);
> + unsigned short mast_stat = read_MASTER_STAT(iface);
>
> if (twi_int_status & XMTSERV) {
> /* Transmit next data */
> if (iface->writeNum > 0) {
> - bfin_write_TWI_XMT_DATA8(*(iface->transPtr++));
> + write_XMT_DATA8(iface, *(iface->transPtr++));
> iface->writeNum--;
> }
> /* start receive immediately after complete sending in
> * combine mode.
> */
> else if (iface->cur_mode == TWI_I2C_MODE_COMBINED)
> - bfin_write_TWI_MASTER_CTL(bfin_read_TWI_MASTER_CTL()
> - | MDIR | RSTART);
> + write_MASTER_CTL(iface,
> + read_MASTER_CTL(iface) | MDIR | RSTART);
> else if (iface->manual_stop)
> - bfin_write_TWI_MASTER_CTL(bfin_read_TWI_MASTER_CTL()
> - | STOP);
> + write_MASTER_CTL(iface,
> + read_MASTER_CTL(iface) | STOP);
> else if (iface->cur_mode == TWI_I2C_MODE_REPEAT &&
> iface->cur_msg+1 < iface->msg_num)
> - bfin_write_TWI_MASTER_CTL(bfin_read_TWI_MASTER_CTL()
> - | RSTART);
> + write_MASTER_CTL(iface,
> + read_MASTER_CTL(iface) | RSTART);
> SSYNC();
> /* Clear status */
> - bfin_write_TWI_INT_STAT(XMTSERV);
> + write_INT_STAT(iface, XMTSERV);
> SSYNC();
> }
> if (twi_int_status & RCVSERV) {
> if (iface->readNum > 0) {
> /* Receive next data */
> - *(iface->transPtr) = bfin_read_TWI_RCV_DATA8();
> + *(iface->transPtr) = read_RCV_DATA8(iface);
> if (iface->cur_mode == TWI_I2C_MODE_COMBINED) {
> /* Change combine mode into sub mode after
> * read first data.
> @@ -113,33 +136,33 @@ static void bfin_twi_handle_interrupt(struct bfin_twi_iface *iface)
> iface->transPtr++;
> iface->readNum--;
> } else if (iface->manual_stop) {
> - bfin_write_TWI_MASTER_CTL(bfin_read_TWI_MASTER_CTL()
> - | STOP);
> + write_MASTER_CTL(iface,
> + read_MASTER_CTL(iface) | STOP);
> SSYNC();
> } else if (iface->cur_mode == TWI_I2C_MODE_REPEAT &&
> iface->cur_msg+1 < iface->msg_num) {
> - bfin_write_TWI_MASTER_CTL(bfin_read_TWI_MASTER_CTL()
> - | RSTART);
> + write_MASTER_CTL(iface,
> + read_MASTER_CTL(iface) | RSTART);
> SSYNC();
> }
> /* Clear interrupt source */
> - bfin_write_TWI_INT_STAT(RCVSERV);
> + write_INT_STAT(iface, RCVSERV);
> SSYNC();
> }
> if (twi_int_status & MERR) {
> - bfin_write_TWI_INT_STAT(MERR);
> - bfin_write_TWI_INT_MASK(0);
> - bfin_write_TWI_MASTER_STAT(0x3e);
> - bfin_write_TWI_MASTER_CTL(0);
> + write_INT_STAT(iface, MERR);
> + write_INT_MASK(iface, 0);
> + write_MASTER_STAT(iface, 0x3e);
> + write_MASTER_CTL(iface, 0);
> SSYNC();
> iface->result = -EIO;
> /* if both err and complete int stats are set, return proper
> * results.
> */
> if (twi_int_status & MCOMP) {
> - bfin_write_TWI_INT_STAT(MCOMP);
> - bfin_write_TWI_INT_MASK(0);
> - bfin_write_TWI_MASTER_CTL(0);
> + write_INT_STAT(iface, MCOMP);
> + write_INT_MASK(iface, 0);
> + write_MASTER_CTL(iface, 0);
> SSYNC();
> /* If it is a quick transfer, only address bug no data,
> * not an err, return 1.
> @@ -156,7 +179,7 @@ static void bfin_twi_handle_interrupt(struct bfin_twi_iface *iface)
> return;
> }
> if (twi_int_status & MCOMP) {
> - bfin_write_TWI_INT_STAT(MCOMP);
> + write_INT_STAT(iface, MCOMP);
> SSYNC();
> if (iface->cur_mode == TWI_I2C_MODE_COMBINED) {
> if (iface->readNum == 0) {
> @@ -165,23 +188,22 @@ static void bfin_twi_handle_interrupt(struct bfin_twi_iface *iface)
> */
> iface->readNum = 1;
> iface->manual_stop = 1;
> - bfin_write_TWI_MASTER_CTL(
> - bfin_read_TWI_MASTER_CTL()
> - | (0xff << 6));
> + write_MASTER_CTL(iface,
> + read_MASTER_CTL(iface) | (0xff << 6));
> } else {
> /* set the readd number in other
> * combine mode.
> */
> - bfin_write_TWI_MASTER_CTL(
> - (bfin_read_TWI_MASTER_CTL() &
> + write_MASTER_CTL(iface,
> + (read_MASTER_CTL(iface) &
> (~(0xff << 6))) |
> - ( iface->readNum << 6));
> + (iface->readNum << 6));
> }
> /* remove restart bit and enable master receive */
> - bfin_write_TWI_MASTER_CTL(bfin_read_TWI_MASTER_CTL() &
> - ~RSTART);
> - bfin_write_TWI_MASTER_CTL(bfin_read_TWI_MASTER_CTL() |
> - MEN | MDIR);
> + write_MASTER_CTL(iface,
> + read_MASTER_CTL(iface) & ~RSTART);
> + write_MASTER_CTL(iface,
> + read_MASTER_CTL(iface) | MEN | MDIR);
> SSYNC();
> } else if (iface->cur_mode == TWI_I2C_MODE_REPEAT &&
> iface->cur_msg+1 < iface->msg_num) {
> @@ -190,7 +212,7 @@ static void bfin_twi_handle_interrupt(struct bfin_twi_iface *iface)
> iface->writeNum = iface->readNum =
> iface->pmsg[iface->cur_msg].len;
> /* Set Transmit device address */
> - bfin_write_TWI_MASTER_ADDR(
> + write_MASTER_ADDR(iface,
> iface->pmsg[iface->cur_msg].addr);
> if (iface->pmsg[iface->cur_msg].flags & I2C_M_RD)
> iface->read_write = I2C_SMBUS_READ;
> @@ -198,7 +220,7 @@ static void bfin_twi_handle_interrupt(struct bfin_twi_iface *iface)
> iface->read_write = I2C_SMBUS_WRITE;
> /* Transmit first data */
> if (iface->writeNum > 0) {
> - bfin_write_TWI_XMT_DATA8(
> + write_XMT_DATA8(iface,
> *(iface->transPtr++));
> iface->writeNum--;
> SSYNC();
> @@ -206,23 +228,23 @@ static void bfin_twi_handle_interrupt(struct bfin_twi_iface *iface)
> }
>
> if (iface->pmsg[iface->cur_msg].len <= 255)
> - bfin_write_TWI_MASTER_CTL(
> + write_MASTER_CTL(iface,
> iface->pmsg[iface->cur_msg].len << 6);
> else if (iface->pmsg[iface->cur_msg].len > 255) {
> - bfin_write_TWI_MASTER_CTL(0xff << 6);
> + write_MASTER_CTL(iface, 0xff << 6);
> iface->manual_stop = 1;
> }
> /* remove restart bit and enable master receive */
> - bfin_write_TWI_MASTER_CTL(bfin_read_TWI_MASTER_CTL() &
> - ~RSTART);
> - bfin_write_TWI_MASTER_CTL(bfin_read_TWI_MASTER_CTL() |
> + write_MASTER_CTL(iface,
> + read_MASTER_CTL(iface) & ~RSTART);
> + write_MASTER_CTL(iface, read_MASTER_CTL(iface) |
> MEN | ((iface->read_write == I2C_SMBUS_READ) ?
> MDIR : 0));
> SSYNC();
> } else {
> iface->result = 1;
> - bfin_write_TWI_INT_MASK(0);
> - bfin_write_TWI_MASTER_CTL(0);
> + write_INT_MASK(iface, 0);
> + write_MASTER_CTL(iface, 0);
> SSYNC();
> complete(&iface->complete);
> }
> @@ -272,12 +294,11 @@ static int bfin_twi_master_xfer(struct i2c_adapter *adap,
> struct i2c_msg *pmsg;
> int rc = 0;
>
> - if (!(bfin_read_TWI_CONTROL() & TWI_ENA))
> + if (!(read_CONTROL(iface) & TWI_ENA))
> return -ENXIO;
>
> - while (bfin_read_TWI_MASTER_STAT() & BUSBUSY) {
> + while (read_MASTER_STAT(iface) & BUSBUSY)
> yield();
> - }
>
> iface->pmsg = msgs;
> iface->msg_num = num;
> @@ -296,14 +317,14 @@ static int bfin_twi_master_xfer(struct i2c_adapter *adap,
> iface->result = 0;
> iface->timeout_count = 10;
> /* Set Transmit device address */
> - bfin_write_TWI_MASTER_ADDR(pmsg->addr);
> + write_MASTER_ADDR(iface, pmsg->addr);
>
> /* FIFO Initiation. Data in FIFO should be
> * discarded before start a new operation.
> */
> - bfin_write_TWI_FIFO_CTL(0x3);
> + write_FIFO_CTL(iface, 0x3);
> SSYNC();
> - bfin_write_TWI_FIFO_CTL(0);
> + write_FIFO_CTL(iface, 0);
> SSYNC();
>
> if (pmsg->flags & I2C_M_RD)
> @@ -312,23 +333,23 @@ static int bfin_twi_master_xfer(struct i2c_adapter *adap,
> iface->read_write = I2C_SMBUS_WRITE;
> /* Transmit first data */
> if (iface->writeNum > 0) {
> - bfin_write_TWI_XMT_DATA8(*(iface->transPtr++));
> + write_XMT_DATA8(iface, *(iface->transPtr++));
> iface->writeNum--;
> SSYNC();
> }
> }
>
> /* clear int stat */
> - bfin_write_TWI_INT_STAT(MERR | MCOMP | XMTSERV | RCVSERV);
> + write_INT_STAT(iface, MERR | MCOMP | XMTSERV | RCVSERV);
>
> /* Interrupt mask . Enable XMT, RCV interrupt */
> - bfin_write_TWI_INT_MASK(MCOMP | MERR | RCVSERV | XMTSERV);
> + write_INT_MASK(iface, MCOMP | MERR | RCVSERV | XMTSERV);
> SSYNC();
>
> if (pmsg->len <= 255)
> - bfin_write_TWI_MASTER_CTL(pmsg->len << 6);
> + write_MASTER_CTL(iface, pmsg->len << 6);
> else if (pmsg->len > 255) {
> - bfin_write_TWI_MASTER_CTL(0xff << 6);
> + write_MASTER_CTL(iface, 0xff << 6);
> iface->manual_stop = 1;
> }
>
> @@ -336,7 +357,7 @@ static int bfin_twi_master_xfer(struct i2c_adapter *adap,
> add_timer(&iface->timeout_timer);
>
> /* Master enable */
> - bfin_write_TWI_MASTER_CTL(bfin_read_TWI_MASTER_CTL() | MEN |
> + write_MASTER_CTL(iface, read_MASTER_CTL(iface) | MEN |
> ((iface->read_write == I2C_SMBUS_READ) ? MDIR : 0) |
> ((CONFIG_I2C_BLACKFIN_TWI_CLK_KHZ > 100) ? FAST : 0));
> SSYNC();
> @@ -362,12 +383,11 @@ int bfin_twi_smbus_xfer(struct i2c_adapter *adap, u16 addr,
> struct bfin_twi_iface *iface = adap->algo_data;
> int rc = 0;
>
> - if (!(bfin_read_TWI_CONTROL() & TWI_ENA))
> + if (!(read_CONTROL(iface) & TWI_ENA))
> return -ENXIO;
>
> - while (bfin_read_TWI_MASTER_STAT() & BUSBUSY) {
> + while (read_MASTER_STAT(iface) & BUSBUSY)
> yield();
> - }
>
> iface->writeNum = 0;
> iface->readNum = 0;
> @@ -439,15 +459,15 @@ int bfin_twi_smbus_xfer(struct i2c_adapter *adap, u16 addr,
> /* FIFO Initiation. Data in FIFO should be discarded before
> * start a new operation.
> */
> - bfin_write_TWI_FIFO_CTL(0x3);
> + write_FIFO_CTL(iface, 0x3);
> SSYNC();
> - bfin_write_TWI_FIFO_CTL(0);
> + write_FIFO_CTL(iface, 0);
>
> /* clear int stat */
> - bfin_write_TWI_INT_STAT(MERR|MCOMP|XMTSERV|RCVSERV);
> + write_INT_STAT(iface, MERR | MCOMP | XMTSERV | RCVSERV);
>
> /* Set Transmit device address */
> - bfin_write_TWI_MASTER_ADDR(addr);
> + write_MASTER_ADDR(iface, addr);
> SSYNC();
>
> iface->timeout_timer.expires = jiffies + POLL_TIMEOUT;
> @@ -455,60 +475,64 @@ int bfin_twi_smbus_xfer(struct i2c_adapter *adap, u16 addr,
>
> switch (iface->cur_mode) {
> case TWI_I2C_MODE_STANDARDSUB:
> - bfin_write_TWI_XMT_DATA8(iface->command);
> - bfin_write_TWI_INT_MASK(MCOMP | MERR |
> + write_XMT_DATA8(iface, iface->command);
> + write_INT_MASK(iface, MCOMP | MERR |
> ((iface->read_write == I2C_SMBUS_READ) ?
> RCVSERV : XMTSERV));
> SSYNC();
>
> if (iface->writeNum + 1 <= 255)
> - bfin_write_TWI_MASTER_CTL((iface->writeNum + 1) << 6);
> + write_MASTER_CTL(iface, (iface->writeNum + 1) << 6);
> else {
> - bfin_write_TWI_MASTER_CTL(0xff << 6);
> + write_MASTER_CTL(iface, 0xff << 6);
> iface->manual_stop = 1;
> }
> /* Master enable */
> - bfin_write_TWI_MASTER_CTL(bfin_read_TWI_MASTER_CTL() | MEN |
> + write_MASTER_CTL(iface, read_MASTER_CTL(iface) | MEN |
> ((CONFIG_I2C_BLACKFIN_TWI_CLK_KHZ>100) ? FAST : 0));
> break;
> case TWI_I2C_MODE_COMBINED:
> - bfin_write_TWI_XMT_DATA8(iface->command);
> - bfin_write_TWI_INT_MASK(MCOMP | MERR | RCVSERV | XMTSERV);
> + write_XMT_DATA8(iface, iface->command);
> + write_INT_MASK(iface, MCOMP | MERR | RCVSERV | XMTSERV);
> SSYNC();
>
> if (iface->writeNum > 0)
> - bfin_write_TWI_MASTER_CTL((iface->writeNum + 1) << 6);
> + write_MASTER_CTL(iface, (iface->writeNum + 1) << 6);
> else
> - bfin_write_TWI_MASTER_CTL(0x1 << 6);
> + write_MASTER_CTL(iface, 0x1 << 6);
> /* Master enable */
> - bfin_write_TWI_MASTER_CTL(bfin_read_TWI_MASTER_CTL() | MEN |
> + write_MASTER_CTL(iface, read_MASTER_CTL(iface) | MEN |
> ((CONFIG_I2C_BLACKFIN_TWI_CLK_KHZ>100) ? FAST : 0));
> break;
> default:
> - bfin_write_TWI_MASTER_CTL(0);
> + write_MASTER_CTL(iface, 0);
> if (size != I2C_SMBUS_QUICK) {
> /* Don't access xmit data register when this is a
> * read operation.
> */
> if (iface->read_write != I2C_SMBUS_READ) {
> if (iface->writeNum > 0) {
> - bfin_write_TWI_XMT_DATA8(*(iface->transPtr++));
> + write_XMT_DATA8(iface,
> + *(iface->transPtr++));
> if (iface->writeNum <= 255)
> - bfin_write_TWI_MASTER_CTL(iface->writeNum << 6);
> + write_MASTER_CTL(iface,
> + iface->writeNum << 6);
> else {
> - bfin_write_TWI_MASTER_CTL(0xff << 6);
> + write_MASTER_CTL(iface,
> + 0xff << 6);
> iface->manual_stop = 1;
> }
> iface->writeNum--;
> } else {
> - bfin_write_TWI_XMT_DATA8(iface->command);
> - bfin_write_TWI_MASTER_CTL(1 << 6);
> + write_XMT_DATA8(iface, iface->command);
> + write_MASTER_CTL(iface, 1 << 6);
> }
> } else {
> if (iface->readNum > 0 && iface->readNum <= 255)
> - bfin_write_TWI_MASTER_CTL(iface->readNum << 6);
> + write_MASTER_CTL(iface,
> + iface->readNum << 6);
> else if (iface->readNum > 255) {
> - bfin_write_TWI_MASTER_CTL(0xff << 6);
> + write_MASTER_CTL(iface, 0xff << 6);
> iface->manual_stop = 1;
> } else {
> del_timer(&iface->timeout_timer);
> @@ -516,13 +540,13 @@ int bfin_twi_smbus_xfer(struct i2c_adapter *adap, u16 addr,
> }
> }
> }
> - bfin_write_TWI_INT_MASK(MCOMP | MERR |
> + write_INT_MASK(iface, MCOMP | MERR |
> ((iface->read_write == I2C_SMBUS_READ) ?
> RCVSERV : XMTSERV));
> SSYNC();
>
> /* Master enable */
> - bfin_write_TWI_MASTER_CTL(bfin_read_TWI_MASTER_CTL() | MEN |
> + write_MASTER_CTL(iface, read_MASTER_CTL(iface) | MEN |
> ((iface->read_write == I2C_SMBUS_READ) ? MDIR : 0) |
> ((CONFIG_I2C_BLACKFIN_TWI_CLK_KHZ > 100) ? FAST : 0));
> break;
> @@ -557,10 +581,10 @@ static struct i2c_algorithm bfin_twi_algorithm = {
>
> static int i2c_bfin_twi_suspend(struct platform_device *dev, pm_message_t state)
> {
> -/* struct bfin_twi_iface *iface = platform_get_drvdata(dev);*/
> + struct bfin_twi_iface *iface = platform_get_drvdata(dev);
>
> /* Disable TWI */
> - bfin_write_TWI_CONTROL(bfin_read_TWI_CONTROL() & ~TWI_ENA);
> + write_CONTROL(iface, read_CONTROL(iface) & ~TWI_ENA);
> SSYNC();
>
> return 0;
> @@ -568,24 +592,53 @@ static int i2c_bfin_twi_suspend(struct platform_device *dev, pm_message_t state)
>
> static int i2c_bfin_twi_resume(struct platform_device *dev)
> {
> -/* struct bfin_twi_iface *iface = platform_get_drvdata(dev);*/
> + struct bfin_twi_iface *iface = platform_get_drvdata(dev);
>
> /* Enable TWI */
> - bfin_write_TWI_CONTROL(bfin_read_TWI_CONTROL() | TWI_ENA);
> + write_CONTROL(iface, read_CONTROL(iface) | TWI_ENA);
> SSYNC();
>
> return 0;
> }
>
> -static int i2c_bfin_twi_probe(struct platform_device *dev)
> +static int i2c_bfin_twi_probe(struct platform_device *pdev)
> {
> - struct bfin_twi_iface *iface = &twi_iface;
> + struct bfin_twi_iface *iface;
> struct i2c_adapter *p_adap;
> + struct resource *res;
> int rc;
>
> + iface = kzalloc(sizeof(struct bfin_twi_iface), GFP_KERNEL);
> + if (!iface) {
> + dev_err(&pdev->dev, "Cannot allocate memory\n");
> + rc = -ENOMEM;
> + goto out_error_nomem;
> + }
> +
> spin_lock_init(&(iface->lock));
> init_completion(&(iface->complete));
> - iface->irq = IRQ_TWI;
> +
> + /* Find and map our resources */
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + if (res == NULL) {
> + dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n");
> + rc = -ENOENT;
> + goto out_error_get_res;
> + }
> +
> + iface->regs_base = ioremap(res->start, (res->end - res->start)+1);

Parentheses not needed. Suggested spaces around "+".

> + if (iface->regs_base == NULL) {
> + dev_err(&pdev->dev, "Cannot map IO\n");
> + rc = -ENXIO;
> + goto out_error_ioremap;
> + }
> +
> + iface->irq = platform_get_irq(pdev, 0);
> + if (iface->irq < 0) {
> + dev_err(&pdev->dev, "No IRQ specified\n");
> + rc = -ENOENT;
> + goto out_error_no_irq;
> + }
>
> init_timer(&(iface->timeout_timer));
> iface->timeout_timer.function = bfin_twi_timeout;
> @@ -593,38 +646,50 @@ static int i2c_bfin_twi_probe(struct platform_device *dev)
>
> p_adap = &iface->adap;
> p_adap->id = I2C_HW_BLACKFIN;
> - strlcpy(p_adap->name, dev->name, sizeof(p_adap->name));
> + strlcpy(p_adap->name, pdev->name, sizeof(p_adap->name));
> p_adap->algo = &bfin_twi_algorithm;
> p_adap->algo_data = iface;
> p_adap->class = I2C_CLASS_ALL;
> - p_adap->dev.parent = &dev->dev;
> + p_adap->dev.parent = &pdev->dev;
>
> rc = request_irq(iface->irq, bfin_twi_interrupt_entry,
> - IRQF_DISABLED, dev->name, iface);
> + IRQF_DISABLED, pdev->name, iface);
> if (rc) {
> - dev_err(&(p_adap->dev), "i2c-bfin-twi: can't get IRQ %d !\n",
> - iface->irq);
> - return -ENODEV;
> + dev_err(&pdev->dev, "can't get IRQ %d !\n", iface->irq);

Suggesting a capital C for consistency.

> + rc = -ENODEV;
> + goto out_error_req_irq;
> }
>
> /* Set TWI internal clock as 10MHz */
> - bfin_write_TWI_CONTROL(((get_sclk() / 1024 / 1024 + 5) / 10) & 0x7F);
> + write_CONTROL(iface, ((get_sclk() / 1024 / 1024 + 5) / 10) & 0x7F);
>
> /* Set Twi interface clock as specified */
> - bfin_write_TWI_CLKDIV((( 5*1024 / CONFIG_I2C_BLACKFIN_TWI_CLK_KHZ )
> - << 8) | (( 5*1024 / CONFIG_I2C_BLACKFIN_TWI_CLK_KHZ )
> + write_CLKDIV(iface, ((5*1024 / CONFIG_I2C_BLACKFIN_TWI_CLK_KHZ)
> + << 8) | ((5*1024 / CONFIG_I2C_BLACKFIN_TWI_CLK_KHZ)
> & 0xFF));
>
> /* Enable TWI */
> - bfin_write_TWI_CONTROL(bfin_read_TWI_CONTROL() | TWI_ENA);
> + write_CONTROL(iface, read_CONTROL(iface) | TWI_ENA);
> SSYNC();
>
> rc = i2c_add_adapter(p_adap);
> if (rc < 0)
> free_irq(iface->irq, iface);

This error path is not correct. You will display the info message below
as if things had worked fine, and you'll return an error without
freeing the allocated memory!

> else
> - platform_set_drvdata(dev, iface);
> + platform_set_drvdata(pdev, iface);
>
> + dev_info(&pdev->dev, "Blackfin I2C TWI controller, regs_base@%p\n",
> + iface->regs_base);
> +
> + return rc;

This should be a "return 0" - if rc is non-zero you should take the
error path.

> +
> +out_error_req_irq:
> +out_error_no_irq:
> + iounmap(iface->regs_base);
> +out_error_ioremap:
> +out_error_get_res:
> + kfree(iface);
> +out_error_nomem:
> return rc;
> }
>
> @@ -653,8 +718,6 @@ static struct platform_driver i2c_bfin_twi_driver = {
>
> static int __init i2c_bfin_twi_init(void)
> {
> - pr_info("I2C: Blackfin I2C TWI driver\n");
> -
> return platform_driver_register(&i2c_bfin_twi_driver);
> }
>

--
Jean Delvare
-
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