| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Sat, 25 Jun 2011 12:24:16 +0100
From: Jonathan Cameron <jic23@....ac.uk>
To: Bryan Freed <bfreed@...omium.org>
CC: linux-kernel@...r.kernel.org, jbrenner@...sinc.com, gregkh@...e.de,
arnd@...db.de, linux-iio@...r.kernel.org
Subject: Re: [PATCH v3 1/3] light sensor: Add SMBUS support to the tsl2563
driver.
On 06/24/11 21:40, Bryan Freed wrote:
> This is so we can support it on x86 SMBUS adapters.
>
> Since i2c adapters which do not provide an smbus_xfer interface fall
> back to using their I2C master_xfer interface, all the i2c_master_send()
> calls in this driver are changed to i2c_smbus_*() calls.
> This will fail on an i2c adapter that implements a proper subset of
> (SMBUS_BYTE | SMBUS_BYTE_DATA | SMBUS_WORD_DATA), but I do not see that
> in any of our adapters today.
>
> This results in a few wrapper functions that provide little additional
> functionality, so remove them and call the smbus functions directly from
> the general driver code.
Looks good. Thanks.
>
> Signed-off-by: Bryan Freed <bfreed@...omium.org>
Acked-by: Jonathan Cameron <jic23@....ac.uk>
> ---
> drivers/staging/iio/light/tsl2563.c | 106 +++++++++++++++--------------------
> 1 files changed, 45 insertions(+), 61 deletions(-)
>
> diff --git a/drivers/staging/iio/light/tsl2563.c b/drivers/staging/iio/light/tsl2563.c
> index 9cffa2e..c60656f 100644
> --- a/drivers/staging/iio/light/tsl2563.c
> +++ b/drivers/staging/iio/light/tsl2563.c
> @@ -137,37 +137,14 @@ struct tsl2563_chip {
> u32 data1;
> };
>
> -static int tsl2563_write(struct i2c_client *client, u8 reg, u8 value)
> -{
> - int ret;
> - u8 buf[2];
> -
> - buf[0] = TSL2563_CMD | reg;
> - buf[1] = value;
> -
> - ret = i2c_master_send(client, buf, sizeof(buf));
> - return (ret == sizeof(buf)) ? 0 : ret;
> -}
> -
> -static int tsl2563_read(struct i2c_client *client, u8 reg, void *buf, int len)
> -{
> - int ret;
> - u8 cmd = TSL2563_CMD | reg;
> -
> - ret = i2c_master_send(client, &cmd, sizeof(cmd));
> - if (ret != sizeof(cmd))
> - return ret;
> -
> - return i2c_master_recv(client, buf, len);
> -}
> -
> static int tsl2563_set_power(struct tsl2563_chip *chip, int on)
> {
> struct i2c_client *client = chip->client;
> u8 cmd;
>
> cmd = on ? TSL2563_CMD_POWER_ON : TSL2563_CMD_POWER_OFF;
> - return tsl2563_write(client, TSL2563_REG_CTRL, cmd);
> + return i2c_smbus_write_byte_data(client,
> + TSL2563_CMD | TSL2563_REG_CTRL, cmd);
> }
>
> /*
> @@ -178,36 +155,40 @@ static int tsl2563_get_power(struct tsl2563_chip *chip)
> {
> struct i2c_client *client = chip->client;
> int ret;
> - u8 val;
>
> - ret = tsl2563_read(client, TSL2563_REG_CTRL, &val, sizeof(val));
> - if (ret != sizeof(val))
> + ret = i2c_smbus_read_byte_data(client, TSL2563_CMD | TSL2563_REG_CTRL);
> + if (ret < 0)
> return ret;
>
> - return (val & TSL2563_CTRL_POWER_MASK) == TSL2563_CMD_POWER_ON;
> + return (ret & TSL2563_CTRL_POWER_MASK) == TSL2563_CMD_POWER_ON;
> }
>
> static int tsl2563_configure(struct tsl2563_chip *chip)
> {
> int ret;
>
> - ret = tsl2563_write(chip->client, TSL2563_REG_TIMING,
> + ret = i2c_smbus_write_byte_data(chip->client,
> + TSL2563_CMD | TSL2563_REG_TIMING,
> chip->gainlevel->gaintime);
> if (ret)
> goto error_ret;
> - ret = tsl2563_write(chip->client, TSL2563_REG_HIGHLOW,
> + ret = i2c_smbus_write_byte_data(chip->client,
> + TSL2563_CMD | TSL2563_REG_HIGHLOW,
> chip->high_thres & 0xFF);
> if (ret)
> goto error_ret;
> - ret = tsl2563_write(chip->client, TSL2563_REG_HIGHHIGH,
> + ret = i2c_smbus_write_byte_data(chip->client,
> + TSL2563_CMD | TSL2563_REG_HIGHHIGH,
> (chip->high_thres >> 8) & 0xFF);
> if (ret)
> goto error_ret;
> - ret = tsl2563_write(chip->client, TSL2563_REG_LOWLOW,
> + ret = i2c_smbus_write_byte_data(chip->client,
> + TSL2563_CMD | TSL2563_REG_LOWLOW,
> chip->low_thres & 0xFF);
> if (ret)
> goto error_ret;
> - ret = tsl2563_write(chip->client, TSL2563_REG_LOWHIGH,
> + ret = i2c_smbus_write_byte_data(chip->client,
> + TSL2563_CMD | TSL2563_REG_LOWHIGH,
> (chip->low_thres >> 8) & 0xFF);
> /* Interrupt register is automatically written anyway if it is relevant
> so is not here */
> @@ -242,8 +223,8 @@ static int tsl2563_read_id(struct tsl2563_chip *chip, u8 *id)
> struct i2c_client *client = chip->client;
> int ret;
>
> - ret = tsl2563_read(client, TSL2563_REG_ID, id, sizeof(*id));
> - if (ret != sizeof(*id))
> + ret = i2c_smbus_read_byte_data(client, TSL2563_CMD | TSL2563_REG_ID);
> + if (ret < 0)
> return ret;
>
> return 0;
> @@ -313,8 +294,9 @@ static int tsl2563_adjust_gainlevel(struct tsl2563_chip *chip, u16 adc)
> (adc > chip->gainlevel->max) ?
> chip->gainlevel++ : chip->gainlevel--;
>
> - tsl2563_write(client, TSL2563_REG_TIMING,
> - chip->gainlevel->gaintime);
> + i2c_smbus_write_byte_data(client,
> + TSL2563_CMD | TSL2563_REG_TIMING,
> + chip->gainlevel->gaintime);
>
> tsl2563_wait_adc(chip);
> tsl2563_wait_adc(chip);
> @@ -327,7 +309,6 @@ static int tsl2563_adjust_gainlevel(struct tsl2563_chip *chip, u16 adc)
> static int tsl2563_get_adc(struct tsl2563_chip *chip)
> {
> struct i2c_client *client = chip->client;
> - u8 buf0[2], buf1[2];
> u16 adc0, adc1;
> int retry = 1;
> int ret = 0;
> @@ -350,19 +331,17 @@ static int tsl2563_get_adc(struct tsl2563_chip *chip)
> }
>
> while (retry) {
> - ret = tsl2563_read(client,
> - TSL2563_REG_DATA0LOW,
> - buf0, sizeof(buf0));
> - if (ret != sizeof(buf0))
> + ret = i2c_smbus_read_word_data(client,
> + TSL2563_CMD | TSL2563_REG_DATA0LOW);
> + if (ret < 0)
> goto out;
> + adc0 = ret;
>
> - ret = tsl2563_read(client, TSL2563_REG_DATA1LOW,
> - buf1, sizeof(buf1));
> - if (ret != sizeof(buf1))
> + ret = i2c_smbus_read_word_data(client,
> + TSL2563_CMD | TSL2563_REG_DATA1LOW);
> + if (ret < 0)
> goto out;
> -
> - adc0 = (buf0[1] << 8) + buf0[0];
> - adc1 = (buf1[1] << 8) + buf1[0];
> + adc1 = ret;
>
> retry = tsl2563_adjust_gainlevel(chip, adc0);
> }
> @@ -592,11 +571,13 @@ static ssize_t tsl2563_write_thresh(struct iio_dev *indio_dev,
> else
> address = TSL2563_REG_LOWLOW;
> mutex_lock(&chip->lock);
> - ret = tsl2563_write(chip->client, address, val & 0xFF);
> + ret = i2c_smbus_write_byte_data(chip->client, TSL2563_CMD | address,
> + val & 0xFF);
> if (ret)
> goto error_ret;
> - ret = tsl2563_write(chip->client, address + 1,
> - (val >> 8) & 0xFF);
> + ret = i2c_smbus_write_byte_data(chip->client,
> + TSL2563_CMD | (address + 1),
> + (val >> 8) & 0xFF);
> if (IIO_EVENT_CODE_EXTRACT_DIR(event_code) == IIO_EV_DIR_RISING)
> chip->high_thres = val;
> else
> @@ -612,7 +593,6 @@ static irqreturn_t tsl2563_event_handler(int irq, void *private)
> {
> struct iio_dev *dev_info = private;
> struct tsl2563_chip *chip = iio_priv(dev_info);
> - u8 cmd = TSL2563_CMD | TSL2563_CLEARINT;
>
> iio_push_event(dev_info, 0,
> IIO_UNMOD_EVENT_CODE(IIO_EV_CLASS_LIGHT,
> @@ -622,7 +602,7 @@ static irqreturn_t tsl2563_event_handler(int irq, void *private)
> iio_get_time_ns());
>
> /* clear the interrupt and push the event */
> - i2c_master_send(chip->client, &cmd, sizeof(cmd));
> + i2c_smbus_write_byte(chip->client, TSL2563_CMD | TSL2563_CLEARINT);
> return IRQ_HANDLED;
> }
>
> @@ -647,13 +627,17 @@ static int tsl2563_write_interrupt_config(struct iio_dev *indio_dev,
> if (ret)
> goto out;
> }
> - ret = tsl2563_write(chip->client, TSL2563_REG_INT, chip->intr);
> + ret = i2c_smbus_write_byte_data(chip->client,
> + TSL2563_CMD | TSL2563_REG_INT,
> + chip->intr);
> chip->int_enabled = true;
> }
>
> if (!state && (chip->intr & 0x30)) {
> chip->intr |= ~0x30;
> - ret = tsl2563_write(chip->client, TSL2563_REG_INT, chip->intr);
> + ret = i2c_smbus_write_byte_data(chip->client,
> + TSL2563_CMD | TSL2563_REG_INT,
> + chip->intr);
> chip->int_enabled = false;
> /* now the interrupt is not enabled, we can go to sleep */
> schedule_delayed_work(&chip->poweroff_work, 5 * HZ);
> @@ -668,16 +652,15 @@ static int tsl2563_read_interrupt_config(struct iio_dev *indio_dev,
> int event_code)
> {
> struct tsl2563_chip *chip = iio_priv(indio_dev);
> - u8 rxbuf;
> int ret;
>
> mutex_lock(&chip->lock);
> - ret = tsl2563_read(chip->client, TSL2563_REG_INT,
> - &rxbuf, sizeof(rxbuf));
> + ret = i2c_smbus_read_byte_data(chip->client,
> + TSL2563_CMD | TSL2563_REG_INT);
> mutex_unlock(&chip->lock);
> if (ret < 0)
> goto error_ret;
> - ret = !!(rxbuf & 0x30);
> + ret = !!(ret & 0x30);
> error_ret:
>
> return ret;
> @@ -797,7 +780,8 @@ static int tsl2563_remove(struct i2c_client *client)
> cancel_delayed_work(&chip->poweroff_work);
> /* Ensure that interrupts are disabled - then flush any bottom halves */
> chip->intr |= ~0x30;
> - tsl2563_write(chip->client, TSL2563_REG_INT, chip->intr);
> + i2c_smbus_write_byte_data(chip->client, TSL2563_CMD | TSL2563_REG_INT,
> + chip->intr);
> flush_scheduled_work();
> tsl2563_set_power(chip, 0);
> if (client->irq)
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists