linux-kernel - Re: [PATCH 1/5] iio: inv_mpu6050: Cleanup hw

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Date:	Sun, 24 Apr 2016 12:10:20 +0100
From:	Jonathan Cameron <jic23@...nel.org>
To:	Crestez Dan Leonard <leonard.crestez@...el.com>,
	linux-iio@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Hartmut Knaack <knaack.h@....de>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Peter Meerwald-Stadler <pmeerw@...erw.net>,
	Daniel Baluta <daniel.baluta@...el.com>,
	Ge Gao <ggao@...ensense.com>
Subject: Re: [PATCH 1/5] iio: inv_mpu6050: Cleanup hw_info mapping

On 20/04/16 14:15, Crestez Dan Leonard wrote:
> The hw_info array was indexed by enum inv_devices chip_type despite the
> fact that the enumeration had more members than the array and was
> ordered differently.
> 
> The patch cleans this up and adds explicit chip_types to i2c/spi/acpi
> IDs. It also adds some stricter checks inside the driver core.
> 
> This happened to work so far because the differences between the
> supported models are very minor.
> 
> Signed-off-by: Crestez Dan Leonard <leonard.crestez@...el.com>h
Ideally I'd like an Ack / review from Ge on these.
The same is true for the whole series.

Looks good to me though!

Jonathan
> ---
>  drivers/iio/imu/inv_mpu6050/inv_mpu_core.c | 15 ++++++++++++++-
>  drivers/iio/imu/inv_mpu6050/inv_mpu_i2c.c  |  2 +-
>  drivers/iio/imu/inv_mpu6050/inv_mpu_spi.c  | 18 ++++++++++++++----
>  3 files changed, 29 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
> index d192953..52e62b3 100644
> --- a/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
> +++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
> @@ -88,16 +88,23 @@ static const struct inv_mpu6050_chip_config chip_config_6050 = {
>  	.accl_fs = INV_MPU6050_FS_02G,
>  };
>  
> +/* Indexed by enum inv_devices */
>  static const struct inv_mpu6050_hw hw_info[] = {
>  	{
>  		.num_reg = 117,
> +		.name = "MPU6050",
> +		.reg = &reg_set_6050,
> +		.config = &chip_config_6050,
> +	},
> +	{
> +		.num_reg = 117,
>  		.name = "MPU6500",
>  		.reg = &reg_set_6500,
>  		.config = &chip_config_6050,
>  	},
>  	{
>  		.num_reg = 117,
> -		.name = "MPU6050",
> +		.name = "MPU6000",
>  		.reg = &reg_set_6050,
>  		.config = &chip_config_6050,
>  	},
> @@ -774,6 +781,12 @@ int inv_mpu_core_probe(struct regmap *regmap, int irq, const char *name,
>  	if (!indio_dev)
>  		return -ENOMEM;
>  
> +	BUILD_BUG_ON(ARRAY_SIZE(hw_info) != INV_NUM_PARTS);
> +	if (chip_type < 0 || chip_type >= INV_NUM_PARTS) {
> +		dev_err(dev, "Bad invensense chip_type=%d name=%s\n",
> +				chip_type, name);
> +		return -ENODEV;
> +	}
>  	st = iio_priv(indio_dev);
>  	st->chip_type = chip_type;
>  	st->powerup_count = 0;
> diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_i2c.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_i2c.c
> index 5ee4e0d..bb1a7b1 100644
> --- a/drivers/iio/imu/inv_mpu6050/inv_mpu_i2c.c
> +++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_i2c.c
> @@ -208,7 +208,7 @@ static const struct i2c_device_id inv_mpu_id[] = {
>  MODULE_DEVICE_TABLE(i2c, inv_mpu_id);
>  
>  static const struct acpi_device_id inv_acpi_match[] = {
> -	{"INVN6500", 0},
> +	{"INVN6500", INV_MPU6500},
>  	{ },
>  };
>  
> diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_spi.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_spi.c
> index 7bcb8d8..3972a46 100644
> --- a/drivers/iio/imu/inv_mpu6050/inv_mpu_spi.c
> +++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_spi.c
> @@ -44,9 +44,19 @@ static int inv_mpu_i2c_disable(struct iio_dev *indio_dev)
>  static int inv_mpu_probe(struct spi_device *spi)
>  {
>  	struct regmap *regmap;
> -	const struct spi_device_id *id = spi_get_device_id(spi);
> -	const char *name = id ? id->name : NULL;
> -	const int chip_type = id ? id->driver_data : 0;
> +	const struct spi_device_id *spi_id;
> +	const struct acpi_device_id *acpi_id;
> +	const char *name = NULL;
> +	enum inv_devices chip_type;
> +
> +	if ((spi_id = spi_get_device_id(spi))) {
> +		chip_type = (enum inv_devices)spi_id->driver_data;
> +		name = spi_id->name;
> +	} else if ((acpi_id = acpi_match_device(spi->dev.driver->acpi_match_table, &spi->dev))) {
> +		chip_type = (enum inv_devices)acpi_id->driver_data;
> +	} else {
> +		return -ENODEV;
> +	}
>  
>  	regmap = devm_regmap_init_spi(spi, &inv_mpu_regmap_config);
>  	if (IS_ERR(regmap)) {
> @@ -76,7 +86,7 @@ static const struct spi_device_id inv_mpu_id[] = {
>  MODULE_DEVICE_TABLE(spi, inv_mpu_id);
>  
>  static const struct acpi_device_id inv_acpi_match[] = {
> -	{"INVN6000", 0},
> +	{"INVN6000", INV_MPU6000},
>  	{ },
>  };
>  MODULE_DEVICE_TABLE(acpi, inv_acpi_match);
>