[1/7] usb: typec: ucsi: add get_fw_info function

[Greg KH <greg@kroah.com>]

On Thu, Jan 17, 2019 at 05:09:03PM -0800, Ajay Gupta wrote:
> Function is to get the details of ccg firmware and device version.
> 
> Signed-off-by: Ajay Gupta <ajayg@nvidia.com>
> ---
>  drivers/usb/typec/ucsi/ucsi_ccg.c | 76 ++++++++++++++++++++++++++++++-
>  1 file changed, 74 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/typec/ucsi/ucsi_ccg.c b/drivers/usb/typec/ucsi/ucsi_ccg.c
> index de8a43bdff68..4d35279ab853 100644
> --- a/drivers/usb/typec/ucsi/ucsi_ccg.c
> +++ b/drivers/usb/typec/ucsi/ucsi_ccg.c
> @@ -17,15 +17,46 @@
>  #include <asm/unaligned.h>
>  #include "ucsi.h"
>  
> +struct ccg_dev_info {
> +	u8 fw_mode:2;
> +	u8 two_pd_ports:2;
> +	u8 row_size_256:2;
> +	u8:1; /* reserved */
> +	u8 hpi_v2_mode:1;
> +	u8 bl_mode:1;
> +	u8 cfgtbl_invalid:1;
> +	u8 fw1_invalid:1;
> +	u8 fw2_invalid:1;
> +	u8:4; /* reserved */
> +	u16 silicon_id;
> +	u16 bl_last_row;
> +} __packed;

Doesn't all of this break into tiny pieces when you read the memory into
a big-endian system?  Be very careful when using bitfields as a "raw"
representation of a structure in memory.

> +
> +struct version_format {
> +	u16 build;
> +	u8 patch;
> +	u8 min:4;
> +	u8 maj:4;
> +};

Same here.

And not packed?  That's dangerous :)


> +
> +struct version_info {
> +	struct version_format base;
> +	struct version_format app;
> +};
> +
>  struct ucsi_ccg {
>  	struct device *dev;
>  	struct ucsi *ucsi;
>  	struct ucsi_ppm ppm;
>  	struct i2c_client *client;
> +	struct ccg_dev_info info;
>  };
>  
> -#define CCGX_RAB_INTR_REG			0x06
> -#define CCGX_RAB_UCSI_CONTROL			0x39
> +#define CCGX_RAB_DEVICE_MODE			0x0000
> +#define CCGX_RAB_INTR_REG			0x0006
> +#define CCGX_RAB_READ_ALL_VER			0x0010
> +#define CCGX_RAB_READ_FW2_VER			0x0020
> +#define CCGX_RAB_UCSI_CONTROL			0x0039
>  #define CCGX_RAB_UCSI_CONTROL_START		BIT(0)
>  #define CCGX_RAB_UCSI_CONTROL_STOP		BIT(1)
>  #define CCGX_RAB_UCSI_DATA_BLOCK(offset)	(0xf000 | ((offset) & 0xff))
> @@ -220,6 +251,41 @@ static irqreturn_t ccg_irq_handler(int irq, void *data)
>  	return IRQ_HANDLED;
>  }
>  
> +static int get_fw_info(struct ucsi_ccg *uc)
> +{
> +	struct device *dev = uc->dev;
> +	struct version_info version[3];
> +	struct version_info *v;
> +	int err, i;
> +
> +	err = ccg_read(uc, CCGX_RAB_READ_ALL_VER, (u8 *)(&version),
> +		       sizeof(version));
> +	if (err < 0)
> +		return err;
> +
> +	for (i = 1; i < ARRAY_SIZE(version); i++) {
> +		v = &version[i];
> +		dev_dbg(dev,
> +			"FW%d Version: %c%c v%x.%x%x, [Base %d.%d.%d.%d]\n",
> +			i, (v->app.build >> 8), (v->app.build & 0xFF),
> +			v->app.patch, v->app.maj, v->app.min,
> +			v->base.maj, v->base.min, v->base.patch,
> +			v->base.build);
> +	}
> +
> +	err = ccg_read(uc, CCGX_RAB_DEVICE_MODE, (u8 *)(&uc->info),
> +		       sizeof(uc->info));
> +	if (err < 0)
> +		return err;
> +
> +	dev_dbg(dev, "fw_mode: %d\n", uc->info.fw_mode);
> +	dev_dbg(dev, "fw1_invalid: %d\n", uc->info.fw1_invalid);
> +	dev_dbg(dev, "fw2_invalid: %d\n", uc->info.fw2_invalid);
> +	dev_dbg(dev, "silicon_id: 0x%04x\n", uc->info.silicon_id);
> +
> +	return 0;
> +}
> +
>  static int ucsi_ccg_probe(struct i2c_client *client,
>  			  const struct i2c_device_id *id)
>  {
> @@ -248,6 +314,12 @@ static int ucsi_ccg_probe(struct i2c_client *client,
>  		return status;
>  	}
>  
> +	status = get_fw_info(uc);
> +	if (status < 0) {
> +		dev_err(uc->dev, "get_fw_info failed - %d\n", status);
> +		return status;

Are all devices required to have this information?  if not, you just
prevented them from working I think :(

thanks,

greg k-h