tpm: replace tpm_gen_interrupt() with tpm_tis_gen_interrupt()

Since tpm_gen_interrupt() is only used in tpm_tis_core.c this commit
replaces it with an internal tpm_tis_gen_interrupt(). The semantics
also changed in a way that on a system error the driver initialization
is failed.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Reviewed-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>

drivers/char/tpm/tpm-interface.c

@@ -461,21 +461,7 @@ ssize_t tpm_getcap(struct tpm_chip *chip, __be32 subcap_id, cap_t *cap,
 		*cap = tpm_cmd.params.getcap_out.cap;
 	return rc;
 }
-
-void tpm_gen_interrupt(struct tpm_chip *chip)
-{
-	struct	tpm_cmd_t tpm_cmd;
-	ssize_t rc;
-
-	tpm_cmd.header.in = tpm_getcap_header;
-	tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
-	tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
-	tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;
-
-	rc = tpm_transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, 0,
-			      "attempting to determine the timeouts");
-}
-EXPORT_SYMBOL_GPL(tpm_gen_interrupt);
+EXPORT_SYMBOL_GPL(tpm_getcap);
 
 #define TPM_ORD_STARTUP cpu_to_be32(153)
 #define TPM_ST_CLEAR cpu_to_be16(1)

drivers/char/tpm/tpm.h

@@ -487,7 +487,6 @@ ssize_t tpm_transmit_cmd(struct tpm_chip *chip, const void *cmd, int len,
 ssize_t tpm_getcap(struct tpm_chip *chip, __be32 subcap_id, cap_t *cap,
 		   const char *desc);
 int tpm_get_timeouts(struct tpm_chip *);
-void tpm_gen_interrupt(struct tpm_chip *);
 int tpm1_auto_startup(struct tpm_chip *chip);
 int tpm_do_selftest(struct tpm_chip *chip);
 unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal);
@@ -534,6 +533,5 @@ ssize_t tpm2_get_tpm_pt(struct tpm_chip *chip, u32 property_id,
 int tpm2_auto_startup(struct tpm_chip *chip);
 void tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type);
 unsigned long tpm2_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal);
-int tpm2_gen_interrupt(struct tpm_chip *chip);
 int tpm2_probe(struct tpm_chip *chip);
 #endif

drivers/char/tpm/tpm2-cmd.c

@@ -736,6 +736,7 @@ ssize_t tpm2_get_tpm_pt(struct tpm_chip *chip, u32 property_id,  u32 *value,
 
 	return rc;
 }
+EXPORT_SYMBOL_GPL(tpm2_get_tpm_pt);
 
 #define TPM2_STARTUP_IN_SIZE \
 	(sizeof(struct tpm_input_header) + \
@@ -923,23 +924,6 @@ static int tpm2_do_selftest(struct tpm_chip *chip)
 	return rc;
 }
 
-/**
- * tpm2_gen_interrupt() - generate an interrupt
- * @chip: TPM chip to use
- *
- * 0 is returned when the operation is successful. If a negative number is
- * returned it remarks a POSIX error code. If a positive number is returned
- * it remarks a TPM error.
- */
-int tpm2_gen_interrupt(struct tpm_chip *chip)
-{
-	u32 dummy;
-
-	return tpm2_get_tpm_pt(chip, 0x100, &dummy,
-			       "attempting to generate an interrupt");
-}
-EXPORT_SYMBOL_GPL(tpm2_gen_interrupt);
-
 /**
  * tpm2_probe() - probe TPM 2.0
  * @chip: TPM chip to use

drivers/char/tpm/tpm_tis_core.c

@@ -526,6 +526,18 @@ static irqreturn_t tis_int_handler(int dummy, void *dev_id)
 	return IRQ_HANDLED;
 }
 
+static int tpm_tis_gen_interrupt(struct tpm_chip *chip)
+{
+	const char *desc = "attempting to generate an interrupt";
+	u32 cap2;
+	cap_t cap;
+
+	if (chip->flags & TPM_CHIP_FLAG_TPM2)
+		return tpm2_get_tpm_pt(chip, 0x100, &cap2, desc);
+	else
+		return tpm_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap, desc);
+}
+
 /* Register the IRQ and issue a command that will cause an interrupt. If an
  * irq is seen then leave the chip setup for IRQ operation, otherwise reverse
  * everything and leave in polling mode. Returns 0 on success.
@@ -575,10 +587,9 @@ static int tpm_tis_probe_irq_single(struct tpm_chip *chip, u32 intmask,
 	/* Generate an interrupt by having the core call through to
 	 * tpm_tis_send
 	 */
-	if (chip->flags & TPM_CHIP_FLAG_TPM2)
-		tpm2_gen_interrupt(chip);
-	else
-		tpm_gen_interrupt(chip);
+	rc = tpm_tis_gen_interrupt(chip);
+	if (rc < 0)
+		return rc;
 
 	/* tpm_tis_send will either confirm the interrupt is working or it
 	 * will call disable_irq which undoes all of the above.