On Friday 08 July 2005 02:42, Marcel Selhorst wrote:
> after some corrections here is a newer patch supporting the Infineon Trusted
> Platform Module SLD 9630 (TPM 1.1b), which is embedded on Intel-mainboards or
> in HP/Fujitsu-Siemens/Toshiba-Notebooks.
> --- linux-2.6.12.2/drivers/char/tpm/tpm_infineon.c
> +++ linux/drivers/char/tpm/tpm_infineon.c
> +static int empty_fifo(struct tpm_chip *chip, int clear_wrfifo)
> +{
> + int status;
> + int check = 0;
> + int i;
> + int j = 0;
> +
> + if (clear_wrfifo) {
> + for (i = 0; i < 4096; i++) {
> + status = inb(chip->vendor->base + WRFIFO);
> + if (status == 0xff) {
> + if (check == 5)
> + break;
> + else
> + check++;
> + }
> + }
> + }
> + /* Note: The values which are currently in the FIFO of the TPM
> + are thrown away since there is no usage for them. Usually,
> + this has nothing to say, since the TPM will give its answer immediately
> + or will be aborted anyway, so the data here is usually garbage and useless.
> + We have to clean this, because the next communication with the TPM would
> + be rubbish, if there is still some old data in the Read FIFO.
> + */
Could you reformat it a little to fit in 80 columns?
> + i = 0;
i is used only in clear_wrfifo loop. Or sacrifice j instead.
> + do {
> + status = inb(chip->vendor->base + RDFIFO);
> + status = inb(chip->vendor->base + STAT);
> + j++;
> + if (j == TPM_MAX_TRIES)
> + return -EIO;
> + } while ((status & (1 << STAT_RDA)) != 0);
> + return 0;
> +}
> +static int wait(struct tpm_chip *chip, int wait_for_bit)
> +{
> + if (i == TPM_MAX_TRIES) { /* when timeout occurs, print information and return -EIO */
We see dev_err() calls, we see -EIO. So only "timeout occurs" should be left.
> + dev_err(&chip->pci_dev->dev, "Timeout in wait(");
> + if (wait_for_bit == STAT_XFE)
> + dev_err(&chip->pci_dev->dev, "STAT_XFE)\n");
> + if (wait_for_bit == STAT_RDA)
> + dev_err(&chip->pci_dev->dev, "STAT_RDA)\n");
> + return -EIO;
> + }
> +/* Note: WTX means Waiting-Time-Extension. Whenever the TPM
> +needs more calculation time, it sends a WTX-package, which has to
> +be acknowledged or aborted. This usually occurs if you are hammering
> +the TPM with key creation. Set the maximum number of WTX-packages in
> +the definitions above, if the number is reached, the waiting-time will be denied
> +and the TPM command has to be resend.
> +*/
Be consistent with the rest of the driver:
/* This style
is OK.
*/
> +static int tpm_inf_recv(struct tpm_chip *chip, u8 * buf, size_t count)
> +{
> + recv_begin:
Labels are placed at column zero usually.
> + dev_dbg(&chip->pci_dev->dev, "Receiving header: ");
> +
> + for (i = 0; i < 4; i++) {
> + ret = wait(chip, STAT_RDA);
> + if (ret)
> + return -EIO;
> +
> + buf[i] = inb(chip->vendor->base + RDFIFO);
> + dev_dbg(&chip->pci_dev->dev, "%02x ", buf[i]);
> + }
> + dev_dbg(&chip->pci_dev->dev, "\n");
One of dev_dbg jobs is to print KERN_DEBUG, but only at the very beginning of
the line.
> + dev_dbg(&chip->pci_dev->dev, "Receiving data: ");
> +
> + for (i = 0; i < size; i++) {
> + wait(chip, STAT_RDA);
> + buf[i] = inb(chip->vendor->base + RDFIFO);
> + dev_dbg(&chip->pci_dev->dev, "%02x ", buf[i]);
> + }
> + dev_dbg(&chip->pci_dev->dev, "\n");
dev_dbg() in the middle.
> + "-> Negative acknowledgement - retransmit commando!\n");
command?
> +static int tpm_inf_send(struct tpm_chip *chip, u8 * buf, size_t count)
> +{
> + count_high = 0;
> + count_low = 0;
What's the point?
> +
> + count_high = (count & 0xffff0000);
> + count_low = (count & 0x0000ffff);
> + dev_dbg(&chip->pci_dev->dev,
> + "Sending data %02x %02x %02x %02x %02x %02x ", TPM_VL_VER,
> + TPM_VL_CHANNEL_TPM, count_4, count_3, count_2, count_1);
> +
> + wait_and_send(chip, TPM_VL_VER);
> + wait_and_send(chip, TPM_VL_CHANNEL_TPM);
> + wait_and_send(chip, count_4);
> + wait_and_send(chip, count_3);
> + wait_and_send(chip, count_2);
> + wait_and_send(chip, count_1);
> +
> + for (i = 0; i < count; i++) {
> + wait_and_send(chip, buf[i]);
> + dev_dbg(&chip->pci_dev->dev, "%02x ", buf[i]);
> + }
dev_dbg in the middle.
> +static int __init tpm_inf_probe(struct pci_dev *pci_dev,
> + const struct pci_device_id *pci_id)
> +{
> + dev_dbg(&pci_dev->dev,
> + "Device activate register status : %x \n", status);
%x\n
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