[PATCH v4 00/15] ST33 I2C TPM driver cleanup

[PATCH v4 00/15] ST33 I2C TPM driver cleanup

[Christophe Ricard]

Hi Peter,

This new patchset version is taking into account as much as possible
Jason Gunthorpe feedbacks. I hope, i am not missing any.

It still brings:
- Some few code clean up from code style up to structure
- Device tree support keeping static platform data configuration support.
- Fixes & improvement for irq support.
- Update the GPLv2 license header

I am also adding the mention Reviewed-By: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
on all those patches. 
Jason, please feel free to let me know if i am mistaking here. :).

This patchset apply on top of James Morris linux-security tree
on top of 594081ee7145cc30a3977cb4e218f81213b63dc5 on next branch
Hope i am targetting to correct tree.

The full patchset got also crosschecked by Jean-Luc here in copy.

Best Regards
Christophe

Christophe Ricard (15):
  tpm/tpm_i2c_stm_st33: Update Kconfig in order to be inline to other
    similar product
  tpm/tpm_i2c_stm_st33: Fix few coding style error reported by
    scripts/checkpatch.pl
  tpm/tpm_i2c_stm_st33: Move tpm registers to tpm_i2c_stm_st33.c
  tpm/tpm_i2c_stm_st33: Add new tpm_stm_dev structure and remove
    tpm_i2c_buffer[0], [1] buffer.
  tpm/tpm_i2c_stm_st33: Remove reference to io_serirq
  tpm/tpm_i2c_stm_st33: Replace err/rc/ret by r for a function return
    code
  tpm/tpm_i2c_stm_st33: Replace tpm_st33_* function with tpm_stm_*
  tpm/tpm_i2c_stm_st33: Add devicetree structure
  tpm/tpm_i2c_stm_st33/dts/st33zp24_i2c: Add DTS Documentation
  tpm/tpm_i2c_stm_st33: Few code cleanup
  tpm/tpm_i2c_stm_st33: Interrupt management improvement
  tpm/tpm_i2c_stm_st33: Remove useless i2c read on interrupt registers
  tpm/tpm_i2c_stm_st33: Fix potential bug in tpm_stm_i2c_send
  tpm/tpm_i2c_stm_st33: Change License header to have up to date address
    information
  tpm/tpm_i2c_stm_st33: Increment driver version to 1.2.1.

 .../devicetree/bindings/security/tpm/st33zp24.txt  |  36 ++
 drivers/char/tpm/Kconfig                           |   4 +-
 drivers/char/tpm/Makefile                          |   2 +-
 drivers/char/tpm/tpm_i2c_stm_st33.c                | 675 +++++++++++----------
 drivers/char/tpm/tpm_i2c_stm_st33.h                |  61 --
 include/linux/platform_data/tpm_i2c_stm_st33.h     |  39 ++
 6 files changed, 449 insertions(+), 368 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/security/tpm/st33zp24.txt
 delete mode 100644 drivers/char/tpm/tpm_i2c_stm_st33.h
 create mode 100644 include/linux/platform_data/tpm_i2c_stm_st33.h

-- 
1.9.1

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[PATCH v4 01/15] tpm/tpm_i2c_stm_st33: Update Kconfig in order to be inline to other similar product

[Christophe Ricard]

STMicroelectronics i2c tpm is the only one to have a different tristate
label.

Rename it "TPM Interface Specification 1.2 Interface (I2C - STMicroelectronics)"

Reviewed-By: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
Signed-off-by: Christophe Ricard <christophe-h.ricard-qxv4g6HH51o@public.gmane.org>
---
 drivers/char/tpm/Kconfig  | 4 ++--
 drivers/char/tpm/Makefile | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/char/tpm/Kconfig b/drivers/char/tpm/Kconfig
index c54cac3..edfb45c 100644
--- a/drivers/char/tpm/Kconfig
+++ b/drivers/char/tpm/Kconfig
@@ -100,8 +100,8 @@ config TCG_IBMVTPM
 	  will be accessible from within Linux.  To compile this driver
 	  as a module, choose M here; the module will be called tpm_ibmvtpm.
 
-config TCG_ST33_I2C
-	tristate "STMicroelectronics ST33 I2C TPM"
+config TCG_TIS_I2C_ST33
+	tristate "TPM Interface Specification 1.2 Interface (I2C - STMicroelectronics)"
 	depends on I2C
 	depends on GPIOLIB
 	---help---
diff --git a/drivers/char/tpm/Makefile b/drivers/char/tpm/Makefile
index 4d85dd6..7f54dae 100644
--- a/drivers/char/tpm/Makefile
+++ b/drivers/char/tpm/Makefile
@@ -20,5 +20,5 @@ obj-$(CONFIG_TCG_NSC) += tpm_nsc.o
 obj-$(CONFIG_TCG_ATMEL) += tpm_atmel.o
 obj-$(CONFIG_TCG_INFINEON) += tpm_infineon.o
 obj-$(CONFIG_TCG_IBMVTPM) += tpm_ibmvtpm.o
-obj-$(CONFIG_TCG_ST33_I2C) += tpm_i2c_stm_st33.o
+obj-$(CONFIG_TCG_TIS_I2C_ST33) += tpm_i2c_stm_st33.o
 obj-$(CONFIG_TCG_XEN) += xen-tpmfront.o
-- 
1.9.1

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[PATCH v4 02/15] tpm/tpm_i2c_stm_st33: Fix few coding style error reported by scripts/checkpatch.pl

[Christophe Ricard]

Fix:
- WARNING: Missing a blank line after declarations
- WARNING: braces {} are not necessary for any arm of this statement

Reviewed-By: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
Signed-off-by: Christophe Ricard <christophe-h.ricard-qxv4g6HH51o@public.gmane.org>
---
 drivers/char/tpm/tpm_i2c_stm_st33.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/char/tpm/tpm_i2c_stm_st33.c b/drivers/char/tpm/tpm_i2c_stm_st33.c
index 4669e37..52d80ef 100644
--- a/drivers/char/tpm/tpm_i2c_stm_st33.c
+++ b/drivers/char/tpm/tpm_i2c_stm_st33.c
@@ -157,6 +157,7 @@ static int read8_reg(struct i2c_client *client, u8 tpm_register,
 static void clear_interruption(struct i2c_client *client)
 {
 	u8 interrupt;
+
 	I2C_READ_DATA(client, TPM_INT_STATUS, &interrupt, 1);
 	I2C_WRITE_DATA(client, TPM_INT_STATUS, &interrupt, 1);
 	I2C_READ_DATA(client, TPM_INT_STATUS, &interrupt, 1);
@@ -233,6 +234,7 @@ static u8 tpm_stm_i2c_status(struct tpm_chip *chip)
 {
 	struct i2c_client *client;
 	u8 data;
+
 	client = (struct i2c_client *)TPM_VPRIV(chip);
 
 	I2C_READ_DATA(client, TPM_STS, &data, 1);
@@ -784,11 +786,11 @@ static int tpm_st33_i2c_pm_suspend(struct device *dev)
 	struct st33zp24_platform_data *pin_infos = dev->platform_data;
 	int ret = 0;
 
-	if (power_mgt) {
+	if (power_mgt)
 		gpio_set_value(pin_infos->io_lpcpd, 0);
-	} else {
+	else
 		ret = tpm_pm_suspend(dev);
-	}
+
 	return ret;
 }				/* tpm_st33_i2c_suspend() */
 
-- 
1.9.1

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[PATCH v4 03/15] tpm/tpm_i2c_stm_st33: Move tpm registers to tpm_i2c_stm_st33.c

[Christophe Ricard]

Move tpm registers to tpm_i2c_stm_st33.c.

Reviewed-By: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
Signed-off-by: Christophe Ricard <christophe-h.ricard-qxv4g6HH51o@public.gmane.org>
---
 drivers/char/tpm/tpm_i2c_stm_st33.c | 17 +++++++++++++++++
 drivers/char/tpm/tpm_i2c_stm_st33.h | 17 -----------------
 2 files changed, 17 insertions(+), 17 deletions(-)

diff --git a/drivers/char/tpm/tpm_i2c_stm_st33.c b/drivers/char/tpm/tpm_i2c_stm_st33.c
index 52d80ef..8a8fc10 100644
--- a/drivers/char/tpm/tpm_i2c_stm_st33.c
+++ b/drivers/char/tpm/tpm_i2c_stm_st33.c
@@ -50,6 +50,23 @@
 #include <linux/slab.h>
 
 #include "tpm.h"
+
+#define TPM_ACCESS			0x0
+#define TPM_STS				0x18
+#define TPM_HASH_END			0x20
+#define TPM_DATA_FIFO			0x24
+#define TPM_HASH_DATA			0x24
+#define TPM_HASH_START			0x28
+#define TPM_INTF_CAPABILITY		0x14
+#define TPM_INT_STATUS			0x10
+#define TPM_INT_ENABLE			0x08
+
+#define TPM_DUMMY_BYTE			0xAA
+#define TPM_WRITE_DIRECTION		0x80
+#define TPM_HEADER_SIZE			10
+#define TPM_BUFSIZE			2048
+
+#define LOCALITY0		0
 #include "tpm_i2c_stm_st33.h"
 
 enum stm33zp24_access {
diff --git a/drivers/char/tpm/tpm_i2c_stm_st33.h b/drivers/char/tpm/tpm_i2c_stm_st33.h
index 439a432..3041271 100644
--- a/drivers/char/tpm/tpm_i2c_stm_st33.h
+++ b/drivers/char/tpm/tpm_i2c_stm_st33.h
@@ -30,23 +30,6 @@
 #ifndef __STM_ST33_TPM_I2C_MAIN_H__
 #define __STM_ST33_TPM_I2C_MAIN_H__
 
-#define TPM_ACCESS			(0x0)
-#define TPM_STS				(0x18)
-#define TPM_HASH_END			(0x20)
-#define TPM_DATA_FIFO			(0x24)
-#define TPM_HASH_DATA			(0x24)
-#define TPM_HASH_START			(0x28)
-#define TPM_INTF_CAPABILITY		(0x14)
-#define TPM_INT_STATUS			(0x10)
-#define TPM_INT_ENABLE			(0x08)
-
-#define TPM_DUMMY_BYTE			0xAA
-#define TPM_WRITE_DIRECTION		0x80
-#define TPM_HEADER_SIZE			10
-#define TPM_BUFSIZE			2048
-
-#define LOCALITY0		0
-
 #define TPM_ST33_I2C			"st33zp24_i2c"
 
 struct st33zp24_platform_data {
-- 
1.9.1

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[PATCH v4 04/15] tpm/tpm_i2c_stm_st33: Add new tpm_stm_dev structure and remove tpm_i2c_buffer[0], [1] buffer.

[Christophe Ricard]

In order to clean big buffers in st33zp24_platform_data structure,
replace with tpm_stm_dev for driver internal usage.
As only one buffer is really necessary replace with buf field.

In the mean time move tpm_i2c_stm_st33.h to include/linux/platform_data.

Reviewed-By: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
Signed-off-by: Christophe Ricard <christophe-h.ricard-qxv4g6HH51o@public.gmane.org>
---
 drivers/char/tpm/tpm_i2c_stm_st33.c            | 198 +++++++++++--------------
 drivers/char/tpm/tpm_i2c_stm_st33.h            |  44 ------
 include/linux/platform_data/tpm_i2c_stm_st33.h |  41 +++++
 3 files changed, 130 insertions(+), 153 deletions(-)
 delete mode 100644 drivers/char/tpm/tpm_i2c_stm_st33.h
 create mode 100644 include/linux/platform_data/tpm_i2c_stm_st33.h

diff --git a/drivers/char/tpm/tpm_i2c_stm_st33.c b/drivers/char/tpm/tpm_i2c_stm_st33.c
index 8a8fc10..07ce463 100644
--- a/drivers/char/tpm/tpm_i2c_stm_st33.c
+++ b/drivers/char/tpm/tpm_i2c_stm_st33.c
@@ -41,7 +41,6 @@
 #include <linux/wait.h>
 #include <linux/string.h>
 #include <linux/interrupt.h>
-#include <linux/spinlock.h>
 #include <linux/sysfs.h>
 #include <linux/gpio.h>
 #include <linux/sched.h>
@@ -49,6 +48,7 @@
 #include <linux/io.h>
 #include <linux/slab.h>
 
+#include <linux/platform_data/tpm_i2c_stm_st33.h>
 #include "tpm.h"
 
 #define TPM_ACCESS			0x0
@@ -67,7 +67,7 @@
 #define TPM_BUFSIZE			2048
 
 #define LOCALITY0		0
-#include "tpm_i2c_stm_st33.h"
+
 
 enum stm33zp24_access {
 	TPM_ACCESS_VALID = 0x80,
@@ -99,6 +99,15 @@ enum tis_defaults {
 	TIS_LONG_TIMEOUT = 2000,
 };
 
+struct tpm_stm_dev {
+	struct i2c_client *client;
+	struct completion irq_detection;
+	struct tpm_chip *chip;
+	u8 buf[TPM_BUFSIZE + 1];
+	int io_serirq;
+	int io_lpcpd;
+};
+
 /*
  * write8_reg
  * Send byte to the TIS register according to the ST33ZP24 I2C protocol.
@@ -107,17 +116,12 @@ enum tis_defaults {
  * @param: tpm_size, The length of the data
  * @return: Returns negative errno, or else the number of bytes written.
  */
-static int write8_reg(struct i2c_client *client, u8 tpm_register,
+static int write8_reg(struct tpm_stm_dev *tpm_dev, u8 tpm_register,
 		      u8 *tpm_data, u16 tpm_size)
 {
-	struct st33zp24_platform_data *pin_infos;
-
-	pin_infos = client->dev.platform_data;
-
-	pin_infos->tpm_i2c_buffer[0][0] = tpm_register;
-	memcpy(&pin_infos->tpm_i2c_buffer[0][1], tpm_data, tpm_size);
-	return i2c_master_send(client, pin_infos->tpm_i2c_buffer[0],
-				tpm_size + 1);
+	tpm_dev->buf[0] = tpm_register;
+	memcpy(tpm_dev->buf + 1, tpm_data, tpm_size);
+	return i2c_master_send(tpm_dev->client, tpm_dev->buf, tpm_size + 1);
 } /* write8_reg() */
 
 /*
@@ -128,50 +132,50 @@ static int write8_reg(struct i2c_client *client, u8 tpm_register,
  * @param: tpm_size, tpm TPM response size to read.
  * @return: number of byte read successfully: should be one if success.
  */
-static int read8_reg(struct i2c_client *client, u8 tpm_register,
+static int read8_reg(struct tpm_stm_dev *tpm_dev, u8 tpm_register,
 		    u8 *tpm_data, int tpm_size)
 {
 	u8 status = 0;
 	u8 data;
 
 	data = TPM_DUMMY_BYTE;
-	status = write8_reg(client, tpm_register, &data, 1);
+	status = write8_reg(tpm_dev, tpm_register, &data, 1);
 	if (status == 2)
-		status = i2c_master_recv(client, tpm_data, tpm_size);
+		status = i2c_master_recv(tpm_dev->client, tpm_data, tpm_size);
 	return status;
 } /* read8_reg() */
 
 /*
  * I2C_WRITE_DATA
  * Send byte to the TIS register according to the ST33ZP24 I2C protocol.
- * @param: client, the chip description
+ * @param: tpm_dev, the chip description
  * @param: tpm_register, the tpm tis register where the data should be written
  * @param: tpm_data, the tpm_data to write inside the tpm_register
  * @param: tpm_size, The length of the data
  * @return: number of byte written successfully: should be one if success.
  */
-#define I2C_WRITE_DATA(client, tpm_register, tpm_data, tpm_size) \
-	(write8_reg(client, tpm_register | \
+#define I2C_WRITE_DATA(tpm_dev, tpm_register, tpm_data, tpm_size) \
+	(write8_reg(tpm_dev, tpm_register | \
 	TPM_WRITE_DIRECTION, tpm_data, tpm_size))
 
 /*
  * I2C_READ_DATA
  * Recv byte from the TIS register according to the ST33ZP24 I2C protocol.
- * @param: tpm, the chip description
+ * @param: tpm_dev, the chip description
  * @param: tpm_register, the tpm tis register where the data should be read
  * @param: tpm_data, the TPM response
  * @param: tpm_size, tpm TPM response size to read.
  * @return: number of byte read successfully: should be one if success.
  */
-#define I2C_READ_DATA(client, tpm_register, tpm_data, tpm_size) \
-	(read8_reg(client, tpm_register, tpm_data, tpm_size))
+#define I2C_READ_DATA(tpm_dev, tpm_register, tpm_data, tpm_size) \
+	(read8_reg(tpm_dev, tpm_register, tpm_data, tpm_size))
 
 /*
  * clear_interruption
  * clear the TPM interrupt register.
  * @param: tpm, the chip description
  */
-static void clear_interruption(struct i2c_client *client)
+static void clear_interruption(struct tpm_stm_dev *tpm_dev)
 {
 	u8 interrupt;
 
@@ -191,17 +195,16 @@ static long _wait_for_interrupt_serirq_timeout(struct tpm_chip *chip,
 {
 	long status;
 	struct i2c_client *client;
-	struct st33zp24_platform_data *pin_infos;
+	struct tpm_stm_dev *tpm_dev;
 
-	client = (struct i2c_client *)TPM_VPRIV(chip);
-	pin_infos = client->dev.platform_data;
+	tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
+	client = tpm_dev->client;
 
 	status = wait_for_completion_interruptible_timeout(
-					&pin_infos->irq_detection,
-						timeout);
+					&tpm_dev->irq_detection,
+					timeout);
 	if (status > 0)
-		enable_irq(gpio_to_irq(pin_infos->io_serirq));
-	gpio_direction_input(pin_infos->io_serirq);
+		enable_irq(client->irq);
 
 	return status;
 } /* wait_for_interrupt_serirq_timeout() */
@@ -210,15 +213,15 @@ static int wait_for_serirq_timeout(struct tpm_chip *chip, bool condition,
 				 unsigned long timeout)
 {
 	int status = 2;
-	struct i2c_client *client;
+	struct tpm_stm_dev *tpm_dev;
 
-	client = (struct i2c_client *)TPM_VPRIV(chip);
+	tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
 
 	status = _wait_for_interrupt_serirq_timeout(chip, timeout);
 	if (!status) {
 		status = -EBUSY;
 	} else {
-		clear_interruption(client);
+		clear_interruption(tpm_dev);
 		if (condition)
 			status = 1;
 	}
@@ -231,13 +234,13 @@ static int wait_for_serirq_timeout(struct tpm_chip *chip, bool condition,
  */
 static void tpm_stm_i2c_cancel(struct tpm_chip *chip)
 {
-	struct i2c_client *client;
+	struct tpm_stm_dev *tpm_dev;
 	u8 data;
 
-	client = (struct i2c_client *)TPM_VPRIV(chip);
+	tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
 
 	data = TPM_STS_COMMAND_READY;
-	I2C_WRITE_DATA(client, TPM_STS, &data, 1);
+	I2C_WRITE_DATA(tpm_dev, TPM_STS, &data, 1);
 	if (chip->vendor.irq)
 		wait_for_serirq_timeout(chip, 1, chip->vendor.timeout_a);
 }	/* tpm_stm_i2c_cancel() */
@@ -249,12 +252,12 @@ static void tpm_stm_i2c_cancel(struct tpm_chip *chip)
  */
 static u8 tpm_stm_i2c_status(struct tpm_chip *chip)
 {
-	struct i2c_client *client;
+	struct tpm_stm_dev *tpm_dev;
 	u8 data;
 
-	client = (struct i2c_client *)TPM_VPRIV(chip);
+	tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
 
-	I2C_READ_DATA(client, TPM_STS, &data, 1);
+	I2C_READ_DATA(tpm_dev, TPM_STS, &data, 1);
 	return data;
 }				/* tpm_stm_i2c_status() */
 
@@ -266,13 +269,13 @@ static u8 tpm_stm_i2c_status(struct tpm_chip *chip)
  */
 static int check_locality(struct tpm_chip *chip)
 {
-	struct i2c_client *client;
+	struct tpm_stm_dev *tpm_dev;
 	u8 data;
 	u8 status;
 
-	client = (struct i2c_client *)TPM_VPRIV(chip);
+	tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
 
-	status = I2C_READ_DATA(client, TPM_ACCESS, &data, 1);
+	status = I2C_READ_DATA(tpm_dev, TPM_ACCESS, &data, 1);
 	if (status && (data &
 		(TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) ==
 		(TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID))
@@ -291,16 +294,16 @@ static int request_locality(struct tpm_chip *chip)
 {
 	unsigned long stop;
 	long rc;
-	struct i2c_client *client;
+	struct tpm_stm_dev *tpm_dev;
 	u8 data;
 
-	client = (struct i2c_client *)TPM_VPRIV(chip);
+	tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
 
 	if (check_locality(chip) == chip->vendor.locality)
 		return chip->vendor.locality;
 
 	data = TPM_ACCESS_REQUEST_USE;
-	rc = I2C_WRITE_DATA(client, TPM_ACCESS, &data, 1);
+	rc = I2C_WRITE_DATA(tpm_dev, TPM_ACCESS, &data, 1);
 	if (rc < 0)
 		goto end;
 
@@ -329,13 +332,13 @@ end:
  */
 static void release_locality(struct tpm_chip *chip)
 {
-	struct i2c_client *client;
+	struct tpm_stm_dev *tpm_dev;
 	u8 data;
 
-	client = (struct i2c_client *)TPM_VPRIV(chip);
+	tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
 	data = TPM_ACCESS_ACTIVE_LOCALITY;
 
-	I2C_WRITE_DATA(client, TPM_ACCESS, &data, 1);
+	I2C_WRITE_DATA(tpm_dev, TPM_ACCESS, &data, 1);
 }
 
 /*
@@ -348,19 +351,20 @@ static int get_burstcount(struct tpm_chip *chip)
 	unsigned long stop;
 	int burstcnt, status;
 	u8 tpm_reg, temp;
+	struct tpm_stm_dev *tpm_dev;
 
-	struct i2c_client *client = (struct i2c_client *)TPM_VPRIV(chip);
+	tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
 
 	stop = jiffies + chip->vendor.timeout_d;
 	do {
 		tpm_reg = TPM_STS + 1;
-		status = I2C_READ_DATA(client, tpm_reg, &temp, 1);
+		status = I2C_READ_DATA(tpm_dev, tpm_reg, &temp, 1);
 		if (status < 0)
 			goto end;
 
 		tpm_reg = tpm_reg + 1;
 		burstcnt = temp;
-		status = I2C_READ_DATA(client, tpm_reg, &temp, 1);
+		status = I2C_READ_DATA(tpm_dev, tpm_reg, &temp, 1);
 		if (status < 0)
 			goto end;
 
@@ -417,9 +421,9 @@ static int wait_for_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
 static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
 {
 	int size = 0, burstcnt, len;
-	struct i2c_client *client;
+	struct tpm_stm_dev *tpm_dev;
 
-	client = (struct i2c_client *)TPM_VPRIV(chip);
+	tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
 
 	while (size < count &&
 	       wait_for_stat(chip,
@@ -431,7 +435,7 @@ static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
 		if (burstcnt < 0)
 			return burstcnt;
 		len = min_t(int, burstcnt, count - size);
-		I2C_READ_DATA(client, TPM_DATA_FIFO, buf + size, len);
+		I2C_READ_DATA(tpm_dev, TPM_DATA_FIFO, buf + size, len);
 		size += len;
 	}
 	return size;
@@ -447,14 +451,14 @@ static irqreturn_t tpm_ioserirq_handler(int irq, void *dev_id)
 {
 	struct tpm_chip *chip = dev_id;
 	struct i2c_client *client;
-	struct st33zp24_platform_data *pin_infos;
+	struct tpm_stm_dev *tpm_dev;
 
 	disable_irq_nosync(irq);
 
-	client = (struct i2c_client *)TPM_VPRIV(chip);
-	pin_infos = client->dev.platform_data;
+	tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
+	client = tpm_dev->client;
 
-	complete(&pin_infos->irq_detection);
+	complete(&tpm_dev->irq_detection);
 	return IRQ_HANDLED;
 } /* tpm_ioserirq_handler() */
 
@@ -476,13 +480,15 @@ static int tpm_stm_i2c_send(struct tpm_chip *chip, unsigned char *buf,
 	int ret;
 	u8 data;
 	struct i2c_client *client;
+	struct tpm_stm_dev *tpm_dev;
 
 	if (chip == NULL)
 		return -EBUSY;
 	if (len < TPM_HEADER_SIZE)
 		return -EBUSY;
 
-	client = (struct i2c_client *)TPM_VPRIV(chip);
+	tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
+	client = tpm_dev->client;
 
 	client->flags = 0;
 
@@ -506,7 +512,7 @@ static int tpm_stm_i2c_send(struct tpm_chip *chip, unsigned char *buf,
 		if (burstcnt < 0)
 			return burstcnt;
 		size = min_t(int, len - i - 1, burstcnt);
-		ret = I2C_WRITE_DATA(client, TPM_DATA_FIFO, buf, size);
+		ret = I2C_WRITE_DATA(tpm_dev, TPM_DATA_FIFO, buf, size);
 		if (ret < 0)
 			goto out_err;
 
@@ -519,7 +525,7 @@ static int tpm_stm_i2c_send(struct tpm_chip *chip, unsigned char *buf,
 		goto out_err;
 	}
 
-	ret = I2C_WRITE_DATA(client, TPM_DATA_FIFO, buf + len - 1, 1);
+	ret = I2C_WRITE_DATA(tpm_dev, TPM_DATA_FIFO, buf + len - 1, 1);
 	if (ret < 0)
 		goto out_err;
 
@@ -530,7 +536,7 @@ static int tpm_stm_i2c_send(struct tpm_chip *chip, unsigned char *buf,
 	}
 
 	data = TPM_STS_GO;
-	I2C_WRITE_DATA(client, TPM_STS, &data, 1);
+	I2C_WRITE_DATA(tpm_dev, TPM_STS, &data, 1);
 
 	return len;
 out_err:
@@ -624,6 +630,7 @@ tpm_st33_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
 	u8 intmask;
 	struct tpm_chip *chip;
 	struct st33zp24_platform_data *platform_data;
+	struct tpm_stm_dev *tpm_dev;
 
 	if (client == NULL) {
 		pr_info("%s: i2c client is NULL. Device not accessible.\n",
@@ -638,11 +645,12 @@ tpm_st33_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
 		goto end;
 	}
 
-	chip = tpm_register_hardware(&client->dev, &st_i2c_tpm);
-	if (!chip) {
-		dev_info(&client->dev, "fail chip\n");
-		err = -ENODEV;
-		goto end;
+	tpm_dev = devm_kzalloc(&client->dev, sizeof(struct tpm_stm_dev),
+			       GFP_KERNEL);
+	if (!tpm_dev) {
+		dev_info(&client->dev, "cannot allocate memory for tpm data\n");
+		err = -ENOMEM;
+		goto _tpm_clean_answer;
 	}
 
 	platform_data = client->dev.platform_data;
@@ -653,20 +661,14 @@ tpm_st33_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
 		goto _tpm_clean_answer;
 	}
 
-	platform_data->tpm_i2c_buffer[0] =
-	    kmalloc(TPM_BUFSIZE * sizeof(u8), GFP_KERNEL);
-	if (platform_data->tpm_i2c_buffer[0] == NULL) {
-		err = -ENOMEM;
-		goto _tpm_clean_answer;
-	}
-	platform_data->tpm_i2c_buffer[1] =
-	    kmalloc(TPM_BUFSIZE * sizeof(u8), GFP_KERNEL);
-	if (platform_data->tpm_i2c_buffer[1] == NULL) {
-		err = -ENOMEM;
-		goto _tpm_clean_response1;
+	chip = tpm_register_hardware(&client->dev, &st_i2c_tpm);
+	if (!chip) {
+		dev_info(&client->dev, "fail chip\n");
+		return -ENODEV;
 	}
 
-	TPM_VPRIV(chip) = client;
+	TPM_VPRIV(chip) = tpm_dev;
+	tpm_dev->client = client;
 
 	chip->vendor.timeout_a = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
 	chip->vendor.timeout_b = msecs_to_jiffies(TIS_LONG_TIMEOUT);
@@ -683,16 +685,16 @@ tpm_st33_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
 	}
 
 	if (interrupts) {
-		init_completion(&platform_data->irq_detection);
+		init_completion(&tpm_dev->irq_detection);
 		if (request_locality(chip) != LOCALITY0) {
 			err = -ENODEV;
-			goto _tpm_clean_response2;
+			goto _tpm_clean_answer;
 		}
 		err = gpio_request(platform_data->io_serirq, "TPM IO_SERIRQ");
 		if (err)
 			goto _gpio_init2;
 
-		clear_interruption(client);
+		clear_interruption(tpm_dev);
 		err = request_irq(gpio_to_irq(platform_data->io_serirq),
 				&tpm_ioserirq_handler,
 				IRQF_TRIGGER_HIGH,
@@ -703,7 +705,7 @@ tpm_st33_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
 			goto _irq_set;
 		}
 
-		err = I2C_READ_DATA(client, TPM_INT_ENABLE, &intmask, 1);
+		err = I2C_READ_DATA(tpm_dev, TPM_INT_ENABLE, &intmask, 1);
 		if (err < 0)
 			goto _irq_set;
 
@@ -714,16 +716,16 @@ tpm_st33_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
 			|  TPM_INTF_STS_VALID_INT
 			|  TPM_INTF_DATA_AVAIL_INT;
 
-		err = I2C_WRITE_DATA(client, TPM_INT_ENABLE, &intmask, 1);
+		err = I2C_WRITE_DATA(tpm_dev, TPM_INT_ENABLE, &intmask, 1);
 		if (err < 0)
 			goto _irq_set;
 
 		intmask = TPM_GLOBAL_INT_ENABLE;
-		err = I2C_WRITE_DATA(client, (TPM_INT_ENABLE + 3), &intmask, 1);
+		err = I2C_WRITE_DATA(tpm_dev, (TPM_INT_ENABLE + 3), &intmask, 1);
 		if (err < 0)
 			goto _irq_set;
 
-		err = I2C_READ_DATA(client, TPM_INT_STATUS, &intmask, 1);
+		err = I2C_READ_DATA(tpm_dev, TPM_INT_STATUS, &intmask, 1);
 		if (err < 0)
 			goto _irq_set;
 
@@ -745,12 +747,6 @@ _gpio_init2:
 _gpio_init1:
 	if (power_mgt)
 		gpio_free(platform_data->io_lpcpd);
-_tpm_clean_response2:
-	kzfree(platform_data->tpm_i2c_buffer[1]);
-	platform_data->tpm_i2c_buffer[1] = NULL;
-_tpm_clean_response1:
-	kzfree(platform_data->tpm_i2c_buffer[0]);
-	platform_data->tpm_i2c_buffer[0] = NULL;
 _tpm_clean_answer:
 	tpm_remove_hardware(chip->dev);
 end:
@@ -766,28 +762,12 @@ end:
  */
 static int tpm_st33_i2c_remove(struct i2c_client *client)
 {
-	struct tpm_chip *chip = (struct tpm_chip *)i2c_get_clientdata(client);
-	struct st33zp24_platform_data *pin_infos =
-		((struct i2c_client *)TPM_VPRIV(chip))->dev.platform_data;
-
-	if (pin_infos != NULL) {
-		free_irq(pin_infos->io_serirq, chip);
-
-		gpio_free(pin_infos->io_serirq);
-		gpio_free(pin_infos->io_lpcpd);
+	struct tpm_chip *chip =
+		(struct tpm_chip *) i2c_get_clientdata(client);
 
+	if (chip)
 		tpm_remove_hardware(chip->dev);
 
-		if (pin_infos->tpm_i2c_buffer[1] != NULL) {
-			kzfree(pin_infos->tpm_i2c_buffer[1]);
-			pin_infos->tpm_i2c_buffer[1] = NULL;
-		}
-		if (pin_infos->tpm_i2c_buffer[0] != NULL) {
-			kzfree(pin_infos->tpm_i2c_buffer[0]);
-			pin_infos->tpm_i2c_buffer[0] = NULL;
-		}
-	}
-
 	return 0;
 }
 
diff --git a/drivers/char/tpm/tpm_i2c_stm_st33.h b/drivers/char/tpm/tpm_i2c_stm_st33.h
deleted file mode 100644
index 3041271..0000000
--- a/drivers/char/tpm/tpm_i2c_stm_st33.h
+++ /dev/null
@@ -1,44 +0,0 @@
-/*
- * STMicroelectronics TPM I2C Linux driver for TPM ST33ZP24
- * Copyright (C) 2009, 2010  STMicroelectronics
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * STMicroelectronics version 1.2.0, Copyright (C) 2010
- * STMicroelectronics comes with ABSOLUTELY NO WARRANTY.
- * This is free software, and you are welcome to redistribute it
- * under certain conditions.
- *
- * @Author: Christophe RICARD tpmsupport-qxv4g6HH51o@public.gmane.org
- *
- * @File: stm_st33_tpm_i2c.h
- *
- * @Date: 09/15/2010
- */
-#ifndef __STM_ST33_TPM_I2C_MAIN_H__
-#define __STM_ST33_TPM_I2C_MAIN_H__
-
-#define TPM_ST33_I2C			"st33zp24_i2c"
-
-struct st33zp24_platform_data {
-	int io_serirq;
-	int io_lpcpd;
-	struct i2c_client *client;
-	u8 *tpm_i2c_buffer[2]; /* 0 Request 1 Response */
-	struct completion irq_detection;
-	struct mutex lock;
-};
-
-#endif /* __STM_ST33_TPM_I2C_MAIN_H__ */
diff --git a/include/linux/platform_data/tpm_i2c_stm_st33.h b/include/linux/platform_data/tpm_i2c_stm_st33.h
new file mode 100644
index 0000000..c5e4b7f
--- /dev/null
+++ b/include/linux/platform_data/tpm_i2c_stm_st33.h
@@ -0,0 +1,41 @@
+/*
+ * STMicroelectronics TPM I2C Linux driver for TPM ST33ZP24
+ * Copyright (C) 2009, 2010  STMicroelectronics
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * STMicroelectronics version 1.2.0, Copyright (C) 2010
+ * STMicroelectronics comes with ABSOLUTELY NO WARRANTY.
+ * This is free software, and you are welcome to redistribute it
+ * under certain conditions.
+ *
+ * @Author: Christophe RICARD tpmsupport-qxv4g6HH51o@public.gmane.org
+ *
+ * @File: stm_st33_tpm_i2c.h
+ *
+ * @Date: 09/15/2010
+ */
+#ifndef __STM_ST33_TPM_I2C_MAIN_H__
+#define __STM_ST33_TPM_I2C_MAIN_H__
+
+
+#define TPM_ST33_I2C			"st33zp24_i2c"
+
+struct st33zp24_platform_data {
+	int io_serirq;
+	int io_lpcpd;
+};
+
+#endif /* __STM_ST33_TPM_I2C_MAIN_H__ */
-- 
1.9.1

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[PATCH v4 05/15] tpm/tpm_i2c_stm_st33: Remove reference to io_serirq

[Christophe Ricard]

The serirq gpio pin is used only as interrupt. After driver initialization,
the serirq signal is always used through interrupt and never with gpio
kernel API.

The irq can then be initialized during the platform_data definition within the client->irq pin.

Reviewed-By: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
Signed-off-by: Christophe Ricard <christophe-h.ricard-qxv4g6HH51o@public.gmane.org>
---
 drivers/char/tpm/tpm_i2c_stm_st33.c            | 13 +++----------
 include/linux/platform_data/tpm_i2c_stm_st33.h |  1 -
 2 files changed, 3 insertions(+), 11 deletions(-)

diff --git a/drivers/char/tpm/tpm_i2c_stm_st33.c b/drivers/char/tpm/tpm_i2c_stm_st33.c
index 07ce463..71ef1da 100644
--- a/drivers/char/tpm/tpm_i2c_stm_st33.c
+++ b/drivers/char/tpm/tpm_i2c_stm_st33.c
@@ -104,7 +104,6 @@ struct tpm_stm_dev {
 	struct completion irq_detection;
 	struct tpm_chip *chip;
 	u8 buf[TPM_BUFSIZE + 1];
-	int io_serirq;
 	int io_lpcpd;
 };
 
@@ -690,18 +689,15 @@ tpm_st33_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
 			err = -ENODEV;
 			goto _tpm_clean_answer;
 		}
-		err = gpio_request(platform_data->io_serirq, "TPM IO_SERIRQ");
-		if (err)
-			goto _gpio_init2;
 
 		clear_interruption(tpm_dev);
-		err = request_irq(gpio_to_irq(platform_data->io_serirq),
+		err = request_irq(client->irq,
 				&tpm_ioserirq_handler,
 				IRQF_TRIGGER_HIGH,
 				"TPM SERIRQ management", chip);
 		if (err < 0) {
 			dev_err(chip->dev , "TPM SERIRQ signals %d not available\n",
-				gpio_to_irq(platform_data->io_serirq));
+				client->irq);
 			goto _irq_set;
 		}
 
@@ -740,10 +736,7 @@ tpm_st33_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
 	dev_info(chip->dev, "TPM I2C Initialized\n");
 	return 0;
 _irq_set:
-	free_irq(gpio_to_irq(platform_data->io_serirq), (void *)chip);
-_gpio_init2:
-	if (interrupts)
-		gpio_free(platform_data->io_serirq);
+	free_irq(client->irq, (void *)chip);
 _gpio_init1:
 	if (power_mgt)
 		gpio_free(platform_data->io_lpcpd);
diff --git a/include/linux/platform_data/tpm_i2c_stm_st33.h b/include/linux/platform_data/tpm_i2c_stm_st33.h
index c5e4b7f..ec698f2 100644
--- a/include/linux/platform_data/tpm_i2c_stm_st33.h
+++ b/include/linux/platform_data/tpm_i2c_stm_st33.h
@@ -34,7 +34,6 @@
 #define TPM_ST33_I2C			"st33zp24_i2c"
 
 struct st33zp24_platform_data {
-	int io_serirq;
 	int io_lpcpd;
 };
 
-- 
1.9.1

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[PATCH v4 06/15] tpm/tpm_i2c_stm_st33: Replace err/rc/ret by r for a function return code

[Christophe Ricard]

Some functions return err, rc or ret for a status code.

Return r instead for all of them.

Reviewed-By: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
Signed-off-by: Christophe Ricard <christophe-h.ricard-qxv4g6HH51o@public.gmane.org>
---
 drivers/char/tpm/tpm_i2c_stm_st33.c | 97 ++++++++++++++++++-------------------
 1 file changed, 48 insertions(+), 49 deletions(-)

diff --git a/drivers/char/tpm/tpm_i2c_stm_st33.c b/drivers/char/tpm/tpm_i2c_stm_st33.c
index 71ef1da..4997eff 100644
--- a/drivers/char/tpm/tpm_i2c_stm_st33.c
+++ b/drivers/char/tpm/tpm_i2c_stm_st33.c
@@ -292,7 +292,7 @@ static int check_locality(struct tpm_chip *chip)
 static int request_locality(struct tpm_chip *chip)
 {
 	unsigned long stop;
-	long rc;
+	long r;
 	struct tpm_stm_dev *tpm_dev;
 	u8 data;
 
@@ -302,15 +302,15 @@ static int request_locality(struct tpm_chip *chip)
 		return chip->vendor.locality;
 
 	data = TPM_ACCESS_REQUEST_USE;
-	rc = I2C_WRITE_DATA(tpm_dev, TPM_ACCESS, &data, 1);
-	if (rc < 0)
+	r = I2C_WRITE_DATA(tpm_dev, TPM_ACCESS, &data, 1);
+	if (r < 0)
 		goto end;
 
 	if (chip->vendor.irq) {
-		rc = wait_for_serirq_timeout(chip, (check_locality
+		r = wait_for_serirq_timeout(chip, (check_locality
 						       (chip) >= 0),
 						      chip->vendor.timeout_a);
-		if (rc > 0)
+		if (r > 0)
 			return chip->vendor.locality;
 	} else {
 		stop = jiffies + chip->vendor.timeout_a;
@@ -320,9 +320,9 @@ static int request_locality(struct tpm_chip *chip)
 			msleep(TPM_TIMEOUT);
 		} while (time_before(jiffies, stop));
 	}
-	rc = -EACCES;
+	r = -EACCES;
 end:
-	return rc;
+	return r;
 } /* request_locality() */
 
 /*
@@ -389,14 +389,14 @@ static int wait_for_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
 			 wait_queue_head_t *queue)
 {
 	unsigned long stop;
-	long rc;
+	long r;
 	u8 status;
 
 	 if (chip->vendor.irq) {
-		rc = wait_for_serirq_timeout(chip, ((tpm_stm_i2c_status
+		r = wait_for_serirq_timeout(chip, ((tpm_stm_i2c_status
 							(chip) & mask) ==
 						       mask), timeout);
-		if (rc > 0)
+		if (r > 0)
 			return 0;
 	} else {
 		stop = jiffies + timeout;
@@ -476,7 +476,7 @@ static int tpm_stm_i2c_send(struct tpm_chip *chip, unsigned char *buf,
 {
 	u32 status, i, size;
 	int burstcnt = 0;
-	int ret;
+	int r;
 	u8 data;
 	struct i2c_client *client;
 	struct tpm_stm_dev *tpm_dev;
@@ -491,9 +491,9 @@ static int tpm_stm_i2c_send(struct tpm_chip *chip, unsigned char *buf,
 
 	client->flags = 0;
 
-	ret = request_locality(chip);
-	if (ret < 0)
-		return ret;
+	r = request_locality(chip);
+	if (r < 0)
+		return r;
 
 	status = tpm_stm_i2c_status(chip);
 	if ((status & TPM_STS_COMMAND_READY) == 0) {
@@ -501,7 +501,7 @@ static int tpm_stm_i2c_send(struct tpm_chip *chip, unsigned char *buf,
 		if (wait_for_stat
 		    (chip, TPM_STS_COMMAND_READY, chip->vendor.timeout_b,
 		     &chip->vendor.int_queue) < 0) {
-			ret = -ETIME;
+			r = -ETIME;
 			goto out_err;
 		}
 	}
@@ -511,8 +511,8 @@ static int tpm_stm_i2c_send(struct tpm_chip *chip, unsigned char *buf,
 		if (burstcnt < 0)
 			return burstcnt;
 		size = min_t(int, len - i - 1, burstcnt);
-		ret = I2C_WRITE_DATA(tpm_dev, TPM_DATA_FIFO, buf, size);
-		if (ret < 0)
+		r = I2C_WRITE_DATA(tpm_dev, TPM_DATA_FIFO, buf, size);
+		if (r < 0)
 			goto out_err;
 
 		i += size;
@@ -520,17 +520,17 @@ static int tpm_stm_i2c_send(struct tpm_chip *chip, unsigned char *buf,
 
 	status = tpm_stm_i2c_status(chip);
 	if ((status & TPM_STS_DATA_EXPECT) == 0) {
-		ret = -EIO;
+		r = -EIO;
 		goto out_err;
 	}
 
-	ret = I2C_WRITE_DATA(tpm_dev, TPM_DATA_FIFO, buf + len - 1, 1);
-	if (ret < 0)
+	r = I2C_WRITE_DATA(tpm_dev, TPM_DATA_FIFO, buf + len - 1, 1);
+	if (r < 0)
 		goto out_err;
 
 	status = tpm_stm_i2c_status(chip);
 	if ((status & TPM_STS_DATA_EXPECT) != 0) {
-		ret = -EIO;
+		r = -EIO;
 		goto out_err;
 	}
 
@@ -541,7 +541,7 @@ static int tpm_stm_i2c_send(struct tpm_chip *chip, unsigned char *buf,
 out_err:
 	tpm_stm_i2c_cancel(chip);
 	release_locality(chip);
-	return ret;
+	return r;
 }
 
 /*
@@ -625,7 +625,7 @@ MODULE_PARM_DESC(power_mgt, "Power Management");
 static int
 tpm_st33_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
 {
-	int err;
+	int r;
 	u8 intmask;
 	struct tpm_chip *chip;
 	struct st33zp24_platform_data *platform_data;
@@ -634,13 +634,13 @@ tpm_st33_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
 	if (client == NULL) {
 		pr_info("%s: i2c client is NULL. Device not accessible.\n",
 			__func__);
-		err = -ENODEV;
+		r = -ENODEV;
 		goto end;
 	}
 
 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
 		dev_info(&client->dev, "client not i2c capable\n");
-		err = -ENODEV;
+		r = -ENODEV;
 		goto end;
 	}
 
@@ -648,7 +648,7 @@ tpm_st33_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
 			       GFP_KERNEL);
 	if (!tpm_dev) {
 		dev_info(&client->dev, "cannot allocate memory for tpm data\n");
-		err = -ENOMEM;
+		r = -ENOMEM;
 		goto _tpm_clean_answer;
 	}
 
@@ -656,7 +656,7 @@ tpm_st33_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
 
 	if (!platform_data) {
 		dev_info(&client->dev, "chip not available\n");
-		err = -ENODEV;
+		r = -ENODEV;
 		goto _tpm_clean_answer;
 	}
 
@@ -677,8 +677,8 @@ tpm_st33_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
 	chip->vendor.locality = LOCALITY0;
 
 	if (power_mgt) {
-		err = gpio_request(platform_data->io_lpcpd, "TPM IO_LPCPD");
-		if (err)
+		r = gpio_request(platform_data->io_lpcpd, "TPM IO_LPCPD");
+		if (r)
 			goto _gpio_init1;
 		gpio_set_value(platform_data->io_lpcpd, 1);
 	}
@@ -686,7 +686,7 @@ tpm_st33_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
 	if (interrupts) {
 		init_completion(&tpm_dev->irq_detection);
 		if (request_locality(chip) != LOCALITY0) {
-			err = -ENODEV;
+			r = -ENODEV;
 			goto _tpm_clean_answer;
 		}
 
@@ -695,14 +695,14 @@ tpm_st33_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
 				&tpm_ioserirq_handler,
 				IRQF_TRIGGER_HIGH,
 				"TPM SERIRQ management", chip);
-		if (err < 0) {
+		if (r < 0) {
 			dev_err(chip->dev , "TPM SERIRQ signals %d not available\n",
 				client->irq);
 			goto _irq_set;
 		}
 
-		err = I2C_READ_DATA(tpm_dev, TPM_INT_ENABLE, &intmask, 1);
-		if (err < 0)
+		r = I2C_READ_DATA(tpm_dev, TPM_INT_ENABLE, &intmask, 1);
+		if (r < 0)
 			goto _irq_set;
 
 		intmask |= TPM_INTF_CMD_READY_INT
@@ -712,17 +712,17 @@ tpm_st33_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
 			|  TPM_INTF_STS_VALID_INT
 			|  TPM_INTF_DATA_AVAIL_INT;
 
-		err = I2C_WRITE_DATA(tpm_dev, TPM_INT_ENABLE, &intmask, 1);
-		if (err < 0)
+		r = I2C_WRITE_DATA(tpm_dev, TPM_INT_ENABLE, &intmask, 1);
+		if (r < 0)
 			goto _irq_set;
 
 		intmask = TPM_GLOBAL_INT_ENABLE;
-		err = I2C_WRITE_DATA(tpm_dev, (TPM_INT_ENABLE + 3), &intmask, 1);
-		if (err < 0)
+		r = I2C_WRITE_DATA(tpm_dev, (TPM_INT_ENABLE + 3), &intmask, 1);
+		if (r < 0)
 			goto _irq_set;
 
-		err = I2C_READ_DATA(tpm_dev, TPM_INT_STATUS, &intmask, 1);
-		if (err < 0)
+		r = I2C_READ_DATA(tpm_dev, TPM_INT_STATUS, &intmask, 1);
+		if (r < 0)
 			goto _irq_set;
 
 		chip->vendor.irq = interrupts;
@@ -744,7 +744,7 @@ _tpm_clean_answer:
 	tpm_remove_hardware(chip->dev);
 end:
 	pr_info("TPM I2C initialisation fail\n");
-	return err;
+	return r;
 }
 
 /*
@@ -774,14 +774,13 @@ static int tpm_st33_i2c_remove(struct i2c_client *client)
 static int tpm_st33_i2c_pm_suspend(struct device *dev)
 {
 	struct st33zp24_platform_data *pin_infos = dev->platform_data;
-	int ret = 0;
+	int r = 0;
 
 	if (power_mgt)
 		gpio_set_value(pin_infos->io_lpcpd, 0);
 	else
-		ret = tpm_pm_suspend(dev);
-
-	return ret;
+		r = tpm_pm_suspend(dev);
+	return r;
 }				/* tpm_st33_i2c_suspend() */
 
 /*
@@ -794,20 +793,20 @@ static int tpm_st33_i2c_pm_resume(struct device *dev)
 	struct tpm_chip *chip = dev_get_drvdata(dev);
 	struct st33zp24_platform_data *pin_infos = dev->platform_data;
 
-	int ret = 0;
+	int r = 0;
 
 	if (power_mgt) {
 		gpio_set_value(pin_infos->io_lpcpd, 1);
-		ret = wait_for_serirq_timeout(chip,
+		r = wait_for_serirq_timeout(chip,
 					  (chip->ops->status(chip) &
 					  TPM_STS_VALID) == TPM_STS_VALID,
 					  chip->vendor.timeout_b);
 	} else {
-		ret = tpm_pm_resume(dev);
-		if (!ret)
+		r = tpm_pm_resume(dev);
+		if (!r)
 			tpm_do_selftest(chip);
 	}
-	return ret;
+	return r;
 }				/* tpm_st33_i2c_pm_resume() */
 #endif
 
-- 
1.9.1

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[PATCH v4 07/15] tpm/tpm_i2c_stm_st33: Replace tpm_st33_* function with tpm_stm_*

[Christophe Ricard]

For sanity, replace every tpm_st33_* with tpm_stm_*

Reviewed-By: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
Signed-off-by: Christophe Ricard <christophe-h.ricard-qxv4g6HH51o@public.gmane.org>
---
 drivers/char/tpm/tpm_i2c_stm_st33.c | 50 ++++++++++++++++++-------------------
 1 file changed, 25 insertions(+), 25 deletions(-)

diff --git a/drivers/char/tpm/tpm_i2c_stm_st33.c b/drivers/char/tpm/tpm_i2c_stm_st33.c
index 4997eff..fdcdf9b 100644
--- a/drivers/char/tpm/tpm_i2c_stm_st33.c
+++ b/drivers/char/tpm/tpm_i2c_stm_st33.c
@@ -225,7 +225,7 @@ static int wait_for_serirq_timeout(struct tpm_chip *chip, bool condition,
 			status = 1;
 	}
 	return status;
-}
+} /* wait_for_serirq_timeout() */
 
 /*
  * tpm_stm_i2c_cancel, cancel is not implemented.
@@ -242,7 +242,7 @@ static void tpm_stm_i2c_cancel(struct tpm_chip *chip)
 	I2C_WRITE_DATA(tpm_dev, TPM_STS, &data, 1);
 	if (chip->vendor.irq)
 		wait_for_serirq_timeout(chip, 1, chip->vendor.timeout_a);
-}	/* tpm_stm_i2c_cancel() */
+} /* tpm_stm_i2c_cancel() */
 
 /*
  * tpm_stm_spi_status return the TPM_STS register
@@ -258,7 +258,7 @@ static u8 tpm_stm_i2c_status(struct tpm_chip *chip)
 
 	I2C_READ_DATA(tpm_dev, TPM_STS, &data, 1);
 	return data;
-}				/* tpm_stm_i2c_status() */
+} /* tpm_stm_i2c_status() */
 
 
 /*
@@ -592,7 +592,7 @@ out:
 	return size;
 }
 
-static bool tpm_st33_i2c_req_canceled(struct tpm_chip *chip, u8 status)
+static bool tpm_stm_i2c_req_canceled(struct tpm_chip *chip, u8 status)
 {
 	return (status == TPM_STS_COMMAND_READY);
 }
@@ -604,7 +604,7 @@ static const struct tpm_class_ops st_i2c_tpm = {
 	.status = tpm_stm_i2c_status,
 	.req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
 	.req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
-	.req_canceled = tpm_st33_i2c_req_canceled,
+	.req_canceled = tpm_stm_i2c_req_canceled,
 };
 
 static int interrupts;
@@ -616,14 +616,14 @@ module_param(power_mgt, int, 0444);
 MODULE_PARM_DESC(power_mgt, "Power Management");
 
 /*
- * tpm_st33_i2c_probe initialize the TPM device
+ * tpm_stm_i2c_probe initialize the TPM device
  * @param: client, the i2c_client drescription (TPM I2C description).
  * @param: id, the i2c_device_id struct.
  * @return: 0 in case of success.
  *	 -1 in other case.
  */
 static int
-tpm_st33_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
+tpm_stm_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
 {
 	int r;
 	u8 intmask;
@@ -748,12 +748,12 @@ end:
 }
 
 /*
- * tpm_st33_i2c_remove remove the TPM device
+ * tpm_stm_i2c_remove remove the TPM device
  * @param: client, the i2c_client drescription (TPM I2C description).
 		clear_bit(0, &chip->is_open);
  * @return: 0 in case of success.
  */
-static int tpm_st33_i2c_remove(struct i2c_client *client)
+static int tpm_stm_i2c_remove(struct i2c_client *client)
 {
 	struct tpm_chip *chip =
 		(struct tpm_chip *) i2c_get_clientdata(client);
@@ -766,12 +766,12 @@ static int tpm_st33_i2c_remove(struct i2c_client *client)
 
 #ifdef CONFIG_PM_SLEEP
 /*
- * tpm_st33_i2c_pm_suspend suspend the TPM device
+ * tpm_stm_i2c_pm_suspend suspend the TPM device
  * @param: client, the i2c_client drescription (TPM I2C description).
  * @param: mesg, the power management message.
  * @return: 0 in case of success.
  */
-static int tpm_st33_i2c_pm_suspend(struct device *dev)
+static int tpm_stm_i2c_pm_suspend(struct device *dev)
 {
 	struct st33zp24_platform_data *pin_infos = dev->platform_data;
 	int r = 0;
@@ -781,14 +781,14 @@ static int tpm_st33_i2c_pm_suspend(struct device *dev)
 	else
 		r = tpm_pm_suspend(dev);
 	return r;
-}				/* tpm_st33_i2c_suspend() */
+} /* tpm_stm_i2c_suspend() */
 
 /*
- * tpm_st33_i2c_pm_resume resume the TPM device
+ * tpm_stm_i2c_pm_resume resume the TPM device
  * @param: client, the i2c_client drescription (TPM I2C description).
  * @return: 0 in case of success.
  */
-static int tpm_st33_i2c_pm_resume(struct device *dev)
+static int tpm_stm_i2c_pm_resume(struct device *dev)
 {
 	struct tpm_chip *chip = dev_get_drvdata(dev);
 	struct st33zp24_platform_data *pin_infos = dev->platform_data;
@@ -807,28 +807,28 @@ static int tpm_st33_i2c_pm_resume(struct device *dev)
 			tpm_do_selftest(chip);
 	}
 	return r;
-}				/* tpm_st33_i2c_pm_resume() */
+} /* tpm_stm_i2c_pm_resume() */
 #endif
 
-static const struct i2c_device_id tpm_st33_i2c_id[] = {
+static const struct i2c_device_id tpm_stm_i2c_id[] = {
 	{TPM_ST33_I2C, 0},
 	{}
 };
-MODULE_DEVICE_TABLE(i2c, tpm_st33_i2c_id);
-static SIMPLE_DEV_PM_OPS(tpm_st33_i2c_ops, tpm_st33_i2c_pm_suspend,
-	tpm_st33_i2c_pm_resume);
-static struct i2c_driver tpm_st33_i2c_driver = {
+MODULE_DEVICE_TABLE(i2c, tpm_stm_i2c_id);
+static SIMPLE_DEV_PM_OPS(tpm_stm_i2c_ops, tpm_stm_i2c_pm_suspend,
+	tpm_stm_i2c_pm_resume);
+static struct i2c_driver tpm_stm_i2c_driver = {
 	.driver = {
 		   .owner = THIS_MODULE,
 		   .name = TPM_ST33_I2C,
-		   .pm = &tpm_st33_i2c_ops,
+		   .pm = &tpm_stm_i2c_ops,
 		   },
-	.probe = tpm_st33_i2c_probe,
-	.remove = tpm_st33_i2c_remove,
-	.id_table = tpm_st33_i2c_id
+	.probe = tpm_stm_i2c_probe,
+	.remove = tpm_stm_i2c_remove,
+	.id_table = tpm_stm_i2c_id
 };
 
-module_i2c_driver(tpm_st33_i2c_driver);
+module_i2c_driver(tpm_stm_i2c_driver);
 
 MODULE_AUTHOR("Christophe Ricard (tpmsupport-qxv4g6HH51o@public.gmane.org)");
 MODULE_DESCRIPTION("STM TPM I2C ST33 Driver");
-- 
1.9.1

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[PATCH v4 08/15] tpm/tpm_i2c_stm_st33: Add devicetree structure

[Christophe Ricard]

Add tpm_stm_st33_i2c dts structure keeping backward compatibility
with static platform_data support as well.
In the mean time to easy this update and to make it much simpler, we:
- Moved all gpio_request to devm_gpio_request_one primitive
- Moved request_irq to devm_request_irq

Reviewed-By: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
Signed-off-by: Christophe Ricard <christophe-h.ricard-qxv4g6HH51o@public.gmane.org>
---
 drivers/char/tpm/tpm_i2c_stm_st33.c | 166 +++++++++++++++++++++++++-----------
 1 file changed, 115 insertions(+), 51 deletions(-)

diff --git a/drivers/char/tpm/tpm_i2c_stm_st33.c b/drivers/char/tpm/tpm_i2c_stm_st33.c
index fdcdf9b..7339e84 100644
--- a/drivers/char/tpm/tpm_i2c_stm_st33.c
+++ b/drivers/char/tpm/tpm_i2c_stm_st33.c
@@ -47,6 +47,8 @@
 #include <linux/uaccess.h>
 #include <linux/io.h>
 #include <linux/slab.h>
+#include <linux/of_irq.h>
+#include <linux/of_gpio.h>
 
 #include <linux/platform_data/tpm_i2c_stm_st33.h>
 #include "tpm.h"
@@ -607,13 +609,80 @@ static const struct tpm_class_ops st_i2c_tpm = {
 	.req_canceled = tpm_stm_i2c_req_canceled,
 };
 
-static int interrupts;
-module_param(interrupts, int, 0444);
-MODULE_PARM_DESC(interrupts, "Enable interrupts");
+#ifdef CONFIG_OF
+static int tpm_stm_i2c_of_request_resources(struct tpm_chip *chip)
+{
+	struct device_node *pp;
+	struct tpm_stm_dev *tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
+	struct i2c_client *client = tpm_dev->client;
+
+	int gpio;
+	int r;
+
+	pp = client->dev.of_node;
+	if (!pp) {
+		dev_err(chip->dev, "No platform data\n");
+		return -ENODEV;
+	}
 
-static int power_mgt = 1;
-module_param(power_mgt, int, 0444);
-MODULE_PARM_DESC(power_mgt, "Power Management");
+	/* Get GPIO from device tree */
+	gpio = of_get_named_gpio(pp, "lpcpd-gpios", 0);
+	if (gpio < 0) {
+		dev_err(chip->dev, "Failed to retrieve lpcpd-gpios from dts.\n");
+		tpm_dev->io_lpcpd = -1;
+		/*
+		 * lpcpd pin is not specified. This is not an issue as
+		 * power management can be also managed by TPM specific
+		 * commands. So leave with a success status code.
+		 */
+		return 0;
+	}
+	/* GPIO request and configuration */
+	r = devm_gpio_request_one(&client->dev, gpio,
+			GPIOF_OUT_INIT_HIGH, "TPM IO LPCPD");
+	if (r) {
+		dev_err(chip->dev, "Failed to request lpcpd pin\n");
+		return -ENODEV;
+	}
+	tpm_dev->io_lpcpd = gpio;
+
+	return 0;
+}
+#else
+static int tpm_stm_i2c_of_request_resources(struct i2c_client *client)
+{
+	return -ENODEV;
+}
+#endif
+
+static int tpm_stm_i2c_request_resources(struct i2c_client *client,
+					 struct tpm_chip *chip)
+{
+	struct st33zp24_platform_data *pdata;
+	struct tpm_stm_dev *tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
+	int r;
+
+	pdata = client->dev.platform_data;
+	if (pdata == NULL) {
+		pr_err("No platform data\n");
+		return -EINVAL;
+	}
+
+	/* store for late use */
+	tpm_dev->io_lpcpd = pdata->io_lpcpd;
+
+	if (gpio_is_valid(pdata->io_lpcpd)) {
+		r = devm_gpio_request_one(&client->dev,
+				pdata->io_lpcpd, GPIOF_OUT_INIT_HIGH,
+				"TPM IO_LPCPD");
+		if (r) {
+			dev_err(chip->dev, "%s : reset gpio_request failed\n", __FILE__);
+			return r;
+		}
+	}
+
+	return 0;
+}
 
 /*
  * tpm_stm_i2c_probe initialize the TPM device
@@ -634,31 +703,18 @@ tpm_stm_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
 	if (client == NULL) {
 		pr_info("%s: i2c client is NULL. Device not accessible.\n",
 			__func__);
-		r = -ENODEV;
-		goto end;
+		return -ENODEV;
 	}
 
 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
 		dev_info(&client->dev, "client not i2c capable\n");
-		r = -ENODEV;
-		goto end;
+		return -ENODEV;
 	}
 
 	tpm_dev = devm_kzalloc(&client->dev, sizeof(struct tpm_stm_dev),
 			       GFP_KERNEL);
-	if (!tpm_dev) {
-		dev_info(&client->dev, "cannot allocate memory for tpm data\n");
-		r = -ENOMEM;
-		goto _tpm_clean_answer;
-	}
-
-	platform_data = client->dev.platform_data;
-
-	if (!platform_data) {
-		dev_info(&client->dev, "chip not available\n");
-		r = -ENODEV;
-		goto _tpm_clean_answer;
-	}
+	if (!tpm_dev)
+		return -ENOMEM;
 
 	chip = tpm_register_hardware(&client->dev, &st_i2c_tpm);
 	if (!chip) {
@@ -669,6 +725,17 @@ tpm_stm_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
 	TPM_VPRIV(chip) = tpm_dev;
 	tpm_dev->client = client;
 
+	platform_data = client->dev.platform_data;
+	if (!platform_data && client->dev.of_node) {
+		r = tpm_stm_i2c_of_request_resources(chip);
+		if (r)
+			goto _tpm_clean_answer;
+	} else if (platform_data) {
+		r = tpm_stm_i2c_request_resources(client, chip);
+		if (r)
+			goto _tpm_clean_answer;
+	}
+
 	chip->vendor.timeout_a = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
 	chip->vendor.timeout_b = msecs_to_jiffies(TIS_LONG_TIMEOUT);
 	chip->vendor.timeout_c = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
@@ -676,14 +743,7 @@ tpm_stm_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
 
 	chip->vendor.locality = LOCALITY0;
 
-	if (power_mgt) {
-		r = gpio_request(platform_data->io_lpcpd, "TPM IO_LPCPD");
-		if (r)
-			goto _gpio_init1;
-		gpio_set_value(platform_data->io_lpcpd, 1);
-	}
-
-	if (interrupts) {
+	if (client->irq) {
 		init_completion(&tpm_dev->irq_detection);
 		if (request_locality(chip) != LOCALITY0) {
 			r = -ENODEV;
@@ -691,19 +751,19 @@ tpm_stm_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
 		}
 
 		clear_interruption(tpm_dev);
-		err = request_irq(client->irq,
-				&tpm_ioserirq_handler,
+		r = devm_request_irq(&client->dev, client->irq,
+				tpm_ioserirq_handler,
 				IRQF_TRIGGER_HIGH,
 				"TPM SERIRQ management", chip);
 		if (r < 0) {
 			dev_err(chip->dev , "TPM SERIRQ signals %d not available\n",
 				client->irq);
-			goto _irq_set;
+			goto _tpm_clean_answer;
 		}
 
 		r = I2C_READ_DATA(tpm_dev, TPM_INT_ENABLE, &intmask, 1);
 		if (r < 0)
-			goto _irq_set;
+			goto _tpm_clean_answer;
 
 		intmask |= TPM_INTF_CMD_READY_INT
 			|  TPM_INTF_FIFO_AVALAIBLE_INT
@@ -714,18 +774,18 @@ tpm_stm_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
 
 		r = I2C_WRITE_DATA(tpm_dev, TPM_INT_ENABLE, &intmask, 1);
 		if (r < 0)
-			goto _irq_set;
+			goto _tpm_clean_answer;
 
 		intmask = TPM_GLOBAL_INT_ENABLE;
 		r = I2C_WRITE_DATA(tpm_dev, (TPM_INT_ENABLE + 3), &intmask, 1);
 		if (r < 0)
-			goto _irq_set;
+			goto _tpm_clean_answer;
 
 		r = I2C_READ_DATA(tpm_dev, TPM_INT_STATUS, &intmask, 1);
 		if (r < 0)
-			goto _irq_set;
+			goto _tpm_clean_answer;
 
-		chip->vendor.irq = interrupts;
+		chip->vendor.irq = client->irq;
 
 		tpm_gen_interrupt(chip);
 	}
@@ -735,15 +795,9 @@ tpm_stm_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
 
 	dev_info(chip->dev, "TPM I2C Initialized\n");
 	return 0;
-_irq_set:
-	free_irq(client->irq, (void *)chip);
-_gpio_init1:
-	if (power_mgt)
-		gpio_free(platform_data->io_lpcpd);
 _tpm_clean_answer:
 	tpm_remove_hardware(chip->dev);
-end:
-	pr_info("TPM I2C initialisation fail\n");
+	dev_info(chip->dev, "TPM I2C initialisation fail\n");
 	return r;
 }
 
@@ -776,7 +830,7 @@ static int tpm_stm_i2c_pm_suspend(struct device *dev)
 	struct st33zp24_platform_data *pin_infos = dev->platform_data;
 	int r = 0;
 
-	if (power_mgt)
+	if (gpio_is_valid(pin_infos->io_lpcpd))
 		gpio_set_value(pin_infos->io_lpcpd, 0);
 	else
 		r = tpm_pm_suspend(dev);
@@ -795,7 +849,7 @@ static int tpm_stm_i2c_pm_resume(struct device *dev)
 
 	int r = 0;
 
-	if (power_mgt) {
+	if (gpio_is_valid(pin_infos->io_lpcpd)) {
 		gpio_set_value(pin_infos->io_lpcpd, 1);
 		r = wait_for_serirq_timeout(chip,
 					  (chip->ops->status(chip) &
@@ -814,14 +868,24 @@ static const struct i2c_device_id tpm_stm_i2c_id[] = {
 	{TPM_ST33_I2C, 0},
 	{}
 };
+
+#ifdef CONFIG_OF
+static const struct of_device_id of_st33zp24_i2c_match[] = {
+	{ .compatible = "st,st33zp24_i2c", },
+	{}
+};
+MODULE_DEVICE_TABLE(of, of_st33zp24_i2c_match);
+#endif
+
 MODULE_DEVICE_TABLE(i2c, tpm_stm_i2c_id);
 static SIMPLE_DEV_PM_OPS(tpm_stm_i2c_ops, tpm_stm_i2c_pm_suspend,
 	tpm_stm_i2c_pm_resume);
 static struct i2c_driver tpm_stm_i2c_driver = {
 	.driver = {
-		   .owner = THIS_MODULE,
-		   .name = TPM_ST33_I2C,
-		   .pm = &tpm_stm_i2c_ops,
+		.owner = THIS_MODULE,
+		.name = TPM_ST33_I2C,
+		.pm = &tpm_stm_i2c_ops,
+		.of_match_table = of_match_ptr(of_st33zp24_i2c_match),
 		   },
 	.probe = tpm_stm_i2c_probe,
 	.remove = tpm_stm_i2c_remove,
-- 
1.9.1

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[PATCH v4 09/15] tpm/tpm_i2c_stm_st33/dts/st33zp24_i2c: Add DTS Documentation

[Christophe Ricard]

st33zp24 tpm can be seen as a trivial i2c device as other i2c tpm.
However several other properties needs to be documented such as lpcpd.

Reviewed-By: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
Signed-off-by: Christophe Ricard <christophe-h.ricard-qxv4g6HH51o@public.gmane.org>
---
 .../devicetree/bindings/security/tpm/st33zp24.txt  | 36 ++++++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/security/tpm/st33zp24.txt

diff --git a/Documentation/devicetree/bindings/security/tpm/st33zp24.txt b/Documentation/devicetree/bindings/security/tpm/st33zp24.txt
new file mode 100644
index 0000000..eb48222
--- /dev/null
+++ b/Documentation/devicetree/bindings/security/tpm/st33zp24.txt
@@ -0,0 +1,36 @@
+* STMicroelectronics SAS. ST33ZP24 TPM SoC
+
+Required properties:
+- compatible: Should be "st,st33zp24_i2c".
+- clock-frequency: I²C work frequency.
+- reg: address on the bus
+
+Optional ST33ZP24 Properties:
+- interrupt-parent: phandle for the interrupt gpio controller
+- interrupts: GPIO interrupt to which the chip is connected
+- lpcpd-gpios: Output GPIO pin used for ST33ZP24 power management D1/D2 state.
+If set vps must present when the platform is going into sleep/hibernate mode.
+
+Optional SoC Specific Properties:
+- pinctrl-names: Contains only one value - "default".
+- pintctrl-0: Specifies the pin control groups used for this controller.
+
+Example (for ARM-based BeagleBoard xM with ST33ZP24 on I2C2):
+
+&i2c2 {
+
+        status = "okay";
+
+        st33zp24: st33zp24@13 {
+
+                compatible = "st,st33zp24_i2c";
+
+                reg = <0x013>;
+                clock-frequency = <400000>;
+
+                interrupt-parent = <&gpio5>;
+                interrupts = <7 IRQ_TYPE_LEVEL_HIGH>;
+
+                lpcpd-gpios = <&gpio5 15 GPIO_ACTIVE_HIGH>;
+        };
+};
-- 
1.9.1

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[PATCH v4 10/15] tpm/tpm_i2c_stm_st33: Few code cleanup

[Christophe Ricard]

Cleanup code indentation, braces, test variable when NULL.

Reviewed-By: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
Signed-off-by: Christophe Ricard <christophe-h.ricard-qxv4g6HH51o@public.gmane.org>
---
 drivers/char/tpm/tpm_i2c_stm_st33.c | 32 ++++++++++++++++----------------
 1 file changed, 16 insertions(+), 16 deletions(-)

diff --git a/drivers/char/tpm/tpm_i2c_stm_st33.c b/drivers/char/tpm/tpm_i2c_stm_st33.c
index 7339e84..54d1728 100644
--- a/drivers/char/tpm/tpm_i2c_stm_st33.c
+++ b/drivers/char/tpm/tpm_i2c_stm_st33.c
@@ -27,7 +27,7 @@
  *
  * @Synopsis:
  *	09/15/2010:	First shot driver tpm_tis driver for
-			 lpc is used as model.
+ *			 lpc is used as model.
  */
 
 #include <linux/pci.h>
@@ -394,7 +394,7 @@ static int wait_for_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
 	long r;
 	u8 status;
 
-	 if (chip->vendor.irq) {
+	if (chip->vendor.irq) {
 		r = wait_for_serirq_timeout(chip, ((tpm_stm_i2c_status
 							(chip) & mask) ==
 						       mask), timeout);
@@ -430,8 +430,7 @@ static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
 	       wait_for_stat(chip,
 			     TPM_STS_DATA_AVAIL | TPM_STS_VALID,
 			     chip->vendor.timeout_c,
-			     &chip->vendor.read_queue)
-	       == 0) {
+			     &chip->vendor.read_queue) == 0) {
 		burstcnt = get_burstcount(chip);
 		if (burstcnt < 0)
 			return burstcnt;
@@ -483,7 +482,7 @@ static int tpm_stm_i2c_send(struct tpm_chip *chip, unsigned char *buf,
 	struct i2c_client *client;
 	struct tpm_stm_dev *tpm_dev;
 
-	if (chip == NULL)
+	if (!chip)
 		return -EBUSY;
 	if (len < TPM_HEADER_SIZE)
 		return -EBUSY;
@@ -560,7 +559,7 @@ static int tpm_stm_i2c_recv(struct tpm_chip *chip, unsigned char *buf,
 	int size = 0;
 	int expected;
 
-	if (chip == NULL)
+	if (!chip)
 		return -EBUSY;
 
 	if (count < TPM_HEADER_SIZE) {
@@ -581,7 +580,7 @@ static int tpm_stm_i2c_recv(struct tpm_chip *chip, unsigned char *buf,
 	}
 
 	size += recv_data(chip, &buf[TPM_HEADER_SIZE],
-					expected - TPM_HEADER_SIZE);
+			expected - TPM_HEADER_SIZE);
 	if (size < expected) {
 		dev_err(chip->dev, "Unable to read remainder of result\n");
 		size = -ETIME;
@@ -663,9 +662,9 @@ static int tpm_stm_i2c_request_resources(struct i2c_client *client,
 	int r;
 
 	pdata = client->dev.platform_data;
-	if (pdata == NULL) {
-		pr_err("No platform data\n");
-		return -EINVAL;
+	if (!pdata) {
+		dev_err(chip->dev, "No platform data\n");
+		return -ENODEV;
 	}
 
 	/* store for late use */
@@ -695,13 +694,13 @@ static int
 tpm_stm_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
 {
 	int r;
-	u8 intmask;
+	u8 intmask = 0;
 	struct tpm_chip *chip;
 	struct st33zp24_platform_data *platform_data;
 	struct tpm_stm_dev *tpm_dev;
 
-	if (client == NULL) {
-		pr_info("%s: i2c client is NULL. Device not accessible.\n",
+	if (!client) {
+		dev_info(chip->dev, "%s: i2c client is NULL. Device not accessible.\n",
 			__func__);
 		return -ENODEV;
 	}
@@ -804,7 +803,7 @@ _tpm_clean_answer:
 /*
  * tpm_stm_i2c_remove remove the TPM device
  * @param: client, the i2c_client drescription (TPM I2C description).
-		clear_bit(0, &chip->is_open);
+ *		clear_bit(0, &chip->is_open);
  * @return: 0 in case of success.
  */
 static int tpm_stm_i2c_remove(struct i2c_client *client)
@@ -834,6 +833,7 @@ static int tpm_stm_i2c_pm_suspend(struct device *dev)
 		gpio_set_value(pin_infos->io_lpcpd, 0);
 	else
 		r = tpm_pm_suspend(dev);
+
 	return r;
 } /* tpm_stm_i2c_suspend() */
 
@@ -868,6 +868,7 @@ static const struct i2c_device_id tpm_stm_i2c_id[] = {
 	{TPM_ST33_I2C, 0},
 	{}
 };
+MODULE_DEVICE_TABLE(i2c, tpm_stm_i2c_id);
 
 #ifdef CONFIG_OF
 static const struct of_device_id of_st33zp24_i2c_match[] = {
@@ -877,7 +878,6 @@ static const struct of_device_id of_st33zp24_i2c_match[] = {
 MODULE_DEVICE_TABLE(of, of_st33zp24_i2c_match);
 #endif
 
-MODULE_DEVICE_TABLE(i2c, tpm_stm_i2c_id);
 static SIMPLE_DEV_PM_OPS(tpm_stm_i2c_ops, tpm_stm_i2c_pm_suspend,
 	tpm_stm_i2c_pm_resume);
 static struct i2c_driver tpm_stm_i2c_driver = {
@@ -886,7 +886,7 @@ static struct i2c_driver tpm_stm_i2c_driver = {
 		.name = TPM_ST33_I2C,
 		.pm = &tpm_stm_i2c_ops,
 		.of_match_table = of_match_ptr(of_st33zp24_i2c_match),
-		   },
+	},
 	.probe = tpm_stm_i2c_probe,
 	.remove = tpm_stm_i2c_remove,
 	.id_table = tpm_stm_i2c_id
-- 
1.9.1

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[PATCH v4 11/15] tpm/tpm_i2c_stm_st33: Interrupt management improvement

[Christophe Ricard]

Improve the irq management by using a new function wait_for_stat.
Instead of using a completion struct, we rely on the waitqueue read_queue
and int_queue from chip->vendor field.

Reviewed-By: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
Signed-off-by: Christophe Ricard <christophe-h.ricard-qxv4g6HH51o@public.gmane.org>
---
 drivers/char/tpm/tpm_i2c_stm_st33.c | 201 ++++++++++++++++++++----------------
 1 file changed, 111 insertions(+), 90 deletions(-)

diff --git a/drivers/char/tpm/tpm_i2c_stm_st33.c b/drivers/char/tpm/tpm_i2c_stm_st33.c
index 54d1728..5431a92 100644
--- a/drivers/char/tpm/tpm_i2c_stm_st33.c
+++ b/drivers/char/tpm/tpm_i2c_stm_st33.c
@@ -39,6 +39,7 @@
 #include <linux/kernel.h>
 #include <linux/delay.h>
 #include <linux/wait.h>
+#include <linux/freezer.h>
 #include <linux/string.h>
 #include <linux/interrupt.h>
 #include <linux/sysfs.h>
@@ -103,9 +104,9 @@ enum tis_defaults {
 
 struct tpm_stm_dev {
 	struct i2c_client *client;
-	struct completion irq_detection;
 	struct tpm_chip *chip;
 	u8 buf[TPM_BUFSIZE + 1];
+	u32 intrs;
 	int io_lpcpd;
 };
 
@@ -175,61 +176,18 @@ static int read8_reg(struct tpm_stm_dev *tpm_dev, u8 tpm_register,
  * clear_interruption
  * clear the TPM interrupt register.
  * @param: tpm, the chip description
+ * @return: the TPM_INT_STATUS value
  */
-static void clear_interruption(struct tpm_stm_dev *tpm_dev)
+static u8 clear_interruption(struct tpm_stm_dev *tpm_dev)
 {
 	u8 interrupt;
 
-	I2C_READ_DATA(client, TPM_INT_STATUS, &interrupt, 1);
-	I2C_WRITE_DATA(client, TPM_INT_STATUS, &interrupt, 1);
-	I2C_READ_DATA(client, TPM_INT_STATUS, &interrupt, 1);
+	I2C_READ_DATA(tpm_dev, TPM_INT_STATUS, &interrupt, 1);
+	I2C_WRITE_DATA(tpm_dev, TPM_INT_STATUS, &interrupt, 1);
+	return interrupt;
 } /* clear_interruption() */
 
 /*
- * _wait_for_interrupt_serirq_timeout
- * @param: tpm, the chip description
- * @param: timeout, the timeout of the interrupt
- * @return: the status of the interruption.
- */
-static long _wait_for_interrupt_serirq_timeout(struct tpm_chip *chip,
-						unsigned long timeout)
-{
-	long status;
-	struct i2c_client *client;
-	struct tpm_stm_dev *tpm_dev;
-
-	tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
-	client = tpm_dev->client;
-
-	status = wait_for_completion_interruptible_timeout(
-					&tpm_dev->irq_detection,
-					timeout);
-	if (status > 0)
-		enable_irq(client->irq);
-
-	return status;
-} /* wait_for_interrupt_serirq_timeout() */
-
-static int wait_for_serirq_timeout(struct tpm_chip *chip, bool condition,
-				 unsigned long timeout)
-{
-	int status = 2;
-	struct tpm_stm_dev *tpm_dev;
-
-	tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
-
-	status = _wait_for_interrupt_serirq_timeout(chip, timeout);
-	if (!status) {
-		status = -EBUSY;
-	} else {
-		clear_interruption(tpm_dev);
-		if (condition)
-			status = 1;
-	}
-	return status;
-} /* wait_for_serirq_timeout() */
-
-/*
  * tpm_stm_i2c_cancel, cancel is not implemented.
  * @param: chip, the tpm_chip description as specified in driver/char/tpm/tpm.h
  */
@@ -242,8 +200,6 @@ static void tpm_stm_i2c_cancel(struct tpm_chip *chip)
 
 	data = TPM_STS_COMMAND_READY;
 	I2C_WRITE_DATA(tpm_dev, TPM_STS, &data, 1);
-	if (chip->vendor.irq)
-		wait_for_serirq_timeout(chip, 1, chip->vendor.timeout_a);
 } /* tpm_stm_i2c_cancel() */
 
 /*
@@ -298,30 +254,24 @@ static int request_locality(struct tpm_chip *chip)
 	struct tpm_stm_dev *tpm_dev;
 	u8 data;
 
-	tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
-
 	if (check_locality(chip) == chip->vendor.locality)
 		return chip->vendor.locality;
 
+	tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
+
 	data = TPM_ACCESS_REQUEST_USE;
 	r = I2C_WRITE_DATA(tpm_dev, TPM_ACCESS, &data, 1);
 	if (r < 0)
 		goto end;
 
-	if (chip->vendor.irq) {
-		r = wait_for_serirq_timeout(chip, (check_locality
-						       (chip) >= 0),
-						      chip->vendor.timeout_a);
-		if (r > 0)
+	stop = jiffies + chip->vendor.timeout_a;
+
+	/* Request locality is usually effective after the request */
+	do {
+		if (check_locality(chip) >= 0)
 			return chip->vendor.locality;
-	} else {
-		stop = jiffies + chip->vendor.timeout_a;
-		do {
-			if (check_locality(chip) >= 0)
-				return chip->vendor.locality;
-			msleep(TPM_TIMEOUT);
-		} while (time_before(jiffies, stop));
-	}
+		msleep(TPM_TIMEOUT);
+	} while (time_before(jiffies, stop));
 	r = -EACCES;
 end:
 	return r;
@@ -379,36 +329,107 @@ end:
 	return -EBUSY;
 } /* get_burstcount() */
 
+static bool wait_for_tpm_stat_cond(struct tpm_chip *chip, u8 mask,
+                    bool check_cancel, bool *canceled)
+{
+	u8 status = chip->ops->status(chip);
+
+	*canceled = false;
+	if ((status & mask) == mask)
+		return true;
+	if (check_cancel && chip->ops->req_canceled(chip, status)) {
+		*canceled = true;
+		return true;
+	}
+	return false;
+}
+
+/*
+ * interrupt_to_status
+ * @param: irq_mask, the irq mask value to wait
+ * @return: the corresponding tpm_sts value
+ */
+static u8 interrupt_to_status(u8 irq_mask)
+{
+	u8 status = 0;
+
+	if ((irq_mask & TPM_INTF_STS_VALID_INT) ==  TPM_INTF_STS_VALID_INT)
+		status |= TPM_STS_VALID;
+	if ((irq_mask & TPM_INTF_DATA_AVAIL_INT) == TPM_INTF_DATA_AVAIL_INT)
+		status |= TPM_STS_DATA_AVAIL;
+	if ((irq_mask & TPM_INTF_CMD_READY_INT) == TPM_INTF_CMD_READY_INT)
+		status |= TPM_STS_COMMAND_READY;
+
+	return status;
+}/* status_to_interrupt() */
+
 /*
  * wait_for_stat wait for a TPM_STS value
  * @param: chip, the tpm chip description
  * @param: mask, the value mask to wait
  * @param: timeout, the timeout
  * @param: queue, the wait queue.
+ * @param: check_cancel, does the command can be cancelled ?
  * @return: the tpm status, 0 if success, -ETIME if timeout is reached.
  */
 static int wait_for_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
-			 wait_queue_head_t *queue)
+			 wait_queue_head_t *queue, bool check_cancel)
 {
 	unsigned long stop;
-	long r;
-	u8 status;
+	int r;
+	bool canceled = false;
+	bool condition;
+	u32 cur_intrs;
+	u8 interrupt, status;
+	struct tpm_stm_dev *tpm_dev;
+
+	tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
+
+	/* check current status */
+	status = tpm_stm_i2c_status(chip);
+	if ((status & mask) == mask)
+		return 0;
+
+	stop = jiffies + timeout;
 
 	if (chip->vendor.irq) {
-		r = wait_for_serirq_timeout(chip, ((tpm_stm_i2c_status
-							(chip) & mask) ==
-						       mask), timeout);
-		if (r > 0)
+		cur_intrs = tpm_dev->intrs;
+		interrupt = clear_interruption(tpm_dev);
+		enable_irq(chip->vendor.irq);
+
+again:
+		timeout = stop - jiffies;
+		if ((long) timeout <= 0)
+			return -1;
+
+		r = wait_event_interruptible_timeout(*queue,
+					cur_intrs != tpm_dev->intrs, timeout);
+
+		interrupt |= clear_interruption(tpm_dev);
+		status = interrupt_to_status(interrupt);
+		condition = wait_for_tpm_stat_cond(chip, mask,
+						check_cancel, &canceled);
+
+		if (r >= 0 && condition) {
+			if (canceled)
+				return -ECANCELED;
 			return 0;
+		}
+		if (r == -ERESTARTSYS && freezing(current)) {
+			clear_thread_flag(TIF_SIGPENDING);
+			goto again;
+		}
+		disable_irq_nosync(chip->vendor.irq);
+
 	} else {
-		stop = jiffies + timeout;
 		do {
 			msleep(TPM_TIMEOUT);
-			status = tpm_stm_i2c_status(chip);
+			status = chip->ops->status(chip);
 			if ((status & mask) == mask)
 				return 0;
 		} while (time_before(jiffies, stop));
 	}
+
 	return -ETIME;
 } /* wait_for_stat() */
 
@@ -430,7 +451,7 @@ static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
 	       wait_for_stat(chip,
 			     TPM_STS_DATA_AVAIL | TPM_STS_VALID,
 			     chip->vendor.timeout_c,
-			     &chip->vendor.read_queue) == 0) {
+			     &chip->vendor.read_queue, true) == 0) {
 		burstcnt = get_burstcount(chip);
 		if (burstcnt < 0)
 			return burstcnt;
@@ -450,15 +471,14 @@ static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
 static irqreturn_t tpm_ioserirq_handler(int irq, void *dev_id)
 {
 	struct tpm_chip *chip = dev_id;
-	struct i2c_client *client;
 	struct tpm_stm_dev *tpm_dev;
 
-	disable_irq_nosync(irq);
-
 	tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
-	client = tpm_dev->client;
 
-	complete(&tpm_dev->irq_detection);
+	tpm_dev->intrs++;
+	wake_up_interruptible(&chip->vendor.read_queue);
+	disable_irq_nosync(chip->vendor.irq);
+
 	return IRQ_HANDLED;
 } /* tpm_ioserirq_handler() */
 
@@ -501,7 +521,7 @@ static int tpm_stm_i2c_send(struct tpm_chip *chip, unsigned char *buf,
 		tpm_stm_i2c_cancel(chip);
 		if (wait_for_stat
 		    (chip, TPM_STS_COMMAND_READY, chip->vendor.timeout_b,
-		     &chip->vendor.int_queue) < 0) {
+		     &chip->vendor.read_queue, false) < 0) {
 			r = -ETIME;
 			goto out_err;
 		}
@@ -743,7 +763,10 @@ tpm_stm_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
 	chip->vendor.locality = LOCALITY0;
 
 	if (client->irq) {
-		init_completion(&tpm_dev->irq_detection);
+		/* INTERRUPT Setup */
+		init_waitqueue_head(&chip->vendor.read_queue);
+		tpm_dev->intrs = 0;
+
 		if (request_locality(chip) != LOCALITY0) {
 			r = -ENODEV;
 			goto _tpm_clean_answer;
@@ -765,9 +788,6 @@ tpm_stm_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
 			goto _tpm_clean_answer;
 
 		intmask |= TPM_INTF_CMD_READY_INT
-			|  TPM_INTF_FIFO_AVALAIBLE_INT
-			|  TPM_INTF_WAKE_UP_READY_INT
-			|  TPM_INTF_LOCALITY_CHANGE_INT
 			|  TPM_INTF_STS_VALID_INT
 			|  TPM_INTF_DATA_AVAIL_INT;
 
@@ -786,6 +806,8 @@ tpm_stm_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
 
 		chip->vendor.irq = client->irq;
 
+		disable_irq_nosync(chip->vendor.irq);
+
 		tpm_gen_interrupt(chip);
 	}
 
@@ -851,10 +873,9 @@ static int tpm_stm_i2c_pm_resume(struct device *dev)
 
 	if (gpio_is_valid(pin_infos->io_lpcpd)) {
 		gpio_set_value(pin_infos->io_lpcpd, 1);
-		r = wait_for_serirq_timeout(chip,
-					  (chip->ops->status(chip) &
-					  TPM_STS_VALID) == TPM_STS_VALID,
-					  chip->vendor.timeout_b);
+		r = wait_for_stat(chip,
+				TPM_STS_VALID, chip->vendor.timeout_b,
+				&chip->vendor.read_queue, false);
 	} else {
 		r = tpm_pm_resume(dev);
 		if (!r)
-- 
1.9.1

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[PATCH v4 12/15] tpm/tpm_i2c_stm_st33: Remove useless i2c read on interrupt registers

[Christophe Ricard]

Remove useless i2c read on TPM_INT_ENABLE and TPM_INT_STATUS

Reviewed-By: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
Signed-off-by: Christophe Ricard <christophe-h.ricard-qxv4g6HH51o@public.gmane.org>
---
 drivers/char/tpm/tpm_i2c_stm_st33.c | 8 --------
 1 file changed, 8 deletions(-)

diff --git a/drivers/char/tpm/tpm_i2c_stm_st33.c b/drivers/char/tpm/tpm_i2c_stm_st33.c
index 5431a92..4bbe3cd 100644
--- a/drivers/char/tpm/tpm_i2c_stm_st33.c
+++ b/drivers/char/tpm/tpm_i2c_stm_st33.c
@@ -783,10 +783,6 @@ tpm_stm_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
 			goto _tpm_clean_answer;
 		}
 
-		r = I2C_READ_DATA(tpm_dev, TPM_INT_ENABLE, &intmask, 1);
-		if (r < 0)
-			goto _tpm_clean_answer;
-
 		intmask |= TPM_INTF_CMD_READY_INT
 			|  TPM_INTF_STS_VALID_INT
 			|  TPM_INTF_DATA_AVAIL_INT;
@@ -800,10 +796,6 @@ tpm_stm_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
 		if (r < 0)
 			goto _tpm_clean_answer;
 
-		r = I2C_READ_DATA(tpm_dev, TPM_INT_STATUS, &intmask, 1);
-		if (r < 0)
-			goto _tpm_clean_answer;
-
 		chip->vendor.irq = client->irq;
 
 		disable_irq_nosync(chip->vendor.irq);
-- 
1.9.1

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[PATCH v4 13/15] tpm/tpm_i2c_stm_st33: Fix potential bug in tpm_stm_i2c_send

[Christophe Ricard]

When sending data in tpm_stm_i2c_send, each loop iteration send buf.
Send buf + i instead as the goal of this for loop is to send a number
of byte from buf that fit in burstcnt. Once those byte are sent, we are
supposed to send the next ones.

The driver was working because the burstcount value returns always the maximum size for a TPM
command or response. (0x800 for a command and 0x400 for a response).

Reviewed-By: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
Signed-off-by: Christophe Ricard <christophe-h.ricard-qxv4g6HH51o@public.gmane.org>
---
 drivers/char/tpm/tpm_i2c_stm_st33.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/char/tpm/tpm_i2c_stm_st33.c b/drivers/char/tpm/tpm_i2c_stm_st33.c
index 4bbe3cd..231d38f 100644
--- a/drivers/char/tpm/tpm_i2c_stm_st33.c
+++ b/drivers/char/tpm/tpm_i2c_stm_st33.c
@@ -532,7 +532,7 @@ static int tpm_stm_i2c_send(struct tpm_chip *chip, unsigned char *buf,
 		if (burstcnt < 0)
 			return burstcnt;
 		size = min_t(int, len - i - 1, burstcnt);
-		r = I2C_WRITE_DATA(tpm_dev, TPM_DATA_FIFO, buf, size);
+		r = I2C_WRITE_DATA(tpm_dev, TPM_DATA_FIFO, buf + i, size);
 		if (r < 0)
 			goto out_err;
 
-- 
1.9.1

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[PATCH v4 14/15] tpm/tpm_i2c_stm_st33: Change License header to have up to date address information

[Christophe Ricard]

The Free Software Foundation may have mail address change.
In order to be sure to have up to date mail address give an url to
the license which includes accurate informations.

Reviewed-By: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
Signed-off-by: Christophe Ricard <christophe-h.ricard-qxv4g6HH51o@public.gmane.org>
---
 drivers/char/tpm/tpm_i2c_stm_st33.c            | 5 ++---
 include/linux/platform_data/tpm_i2c_stm_st33.h | 5 ++---
 2 files changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/char/tpm/tpm_i2c_stm_st33.c b/drivers/char/tpm/tpm_i2c_stm_st33.c
index 231d38f..162b91a 100644
--- a/drivers/char/tpm/tpm_i2c_stm_st33.c
+++ b/drivers/char/tpm/tpm_i2c_stm_st33.c
@@ -12,9 +12,8 @@
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
  *
  * STMicroelectronics version 1.2.0, Copyright (C) 2010
  * STMicroelectronics comes with ABSOLUTELY NO WARRANTY.
diff --git a/include/linux/platform_data/tpm_i2c_stm_st33.h b/include/linux/platform_data/tpm_i2c_stm_st33.h
index ec698f2..85775cf 100644
--- a/include/linux/platform_data/tpm_i2c_stm_st33.h
+++ b/include/linux/platform_data/tpm_i2c_stm_st33.h
@@ -12,9 +12,8 @@
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
  *
  * STMicroelectronics version 1.2.0, Copyright (C) 2010
  * STMicroelectronics comes with ABSOLUTELY NO WARRANTY.
-- 
1.9.1

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[PATCH v4 15/15] tpm/tpm_i2c_stm_st33: Increment driver version to 1.2.1.

[Christophe Ricard]

Many changes were added to the driver so increment the version.

Reviewed-By: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
Signed-off-by: Christophe Ricard <christophe-h.ricard-qxv4g6HH51o@public.gmane.org>
---
 drivers/char/tpm/tpm_i2c_stm_st33.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/char/tpm/tpm_i2c_stm_st33.c b/drivers/char/tpm/tpm_i2c_stm_st33.c
index 162b91a..52869a2 100644
--- a/drivers/char/tpm/tpm_i2c_stm_st33.c
+++ b/drivers/char/tpm/tpm_i2c_stm_st33.c
@@ -1,6 +1,6 @@
 /*
  * STMicroelectronics TPM I2C Linux driver for TPM ST33ZP24
- * Copyright (C) 2009, 2010  STMicroelectronics
+ * Copyright (C) 2009, 2010, 2014  STMicroelectronics
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -15,7 +15,7 @@
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  *
- * STMicroelectronics version 1.2.0, Copyright (C) 2010
+ * STMicroelectronics version 1.2.1, Copyright (C) 2014
  * STMicroelectronics comes with ABSOLUTELY NO WARRANTY.
  * This is free software, and you are welcome to redistribute it
  * under certain conditions.
@@ -908,5 +908,5 @@ module_i2c_driver(tpm_stm_i2c_driver);
 
 MODULE_AUTHOR("Christophe Ricard (tpmsupport-qxv4g6HH51o@public.gmane.org)");
 MODULE_DESCRIPTION("STM TPM I2C ST33 Driver");
-MODULE_VERSION("1.2.0");
+MODULE_VERSION("1.2.1");
 MODULE_LICENSE("GPL");
-- 
1.9.1

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Re: [PATCH v4 09/15] tpm/tpm_i2c_stm_st33/dts/st33zp24_i2c: Add DTS Documentation

[Peter Hüwe]

Hi,

can I get an ACK from the device tree gurus?

Am Sonntag, 19. Oktober 2014, 23:11:19 schrieb Christophe Ricard:
> st33zp24 tpm can be seen as a trivial i2c device as other i2c tpm.
> However several other properties needs to be documented such as lpcpd.
> 
> Reviewed-By: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
> Signed-off-by: Christophe Ricard <christophe-h.ricard-qxv4g6HH51o@public.gmane.org>
> ---
>  .../devicetree/bindings/security/tpm/st33zp24.txt  | 36
> ++++++++++++++++++++++ 1 file changed, 36 insertions(+)
>  create mode 100644
> Documentation/devicetree/bindings/security/tpm/st33zp24.txt
> 
> diff --git a/Documentation/devicetree/bindings/security/tpm/st33zp24.txt
> b/Documentation/devicetree/bindings/security/tpm/st33zp24.txt new file
> mode 100644
> index 0000000..eb48222
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/security/tpm/st33zp24.txt
> @@ -0,0 +1,36 @@
> +* STMicroelectronics SAS. ST33ZP24 TPM SoC
> +
> +Required properties:
> +- compatible: Should be "st,st33zp24_i2c".
> +- clock-frequency: I²C work frequency.
> +- reg: address on the bus
> +
> +Optional ST33ZP24 Properties:
> +- interrupt-parent: phandle for the interrupt gpio controller
> +- interrupts: GPIO interrupt to which the chip is connected
> +- lpcpd-gpios: Output GPIO pin used for ST33ZP24 power management D1/D2
> state. +If set vps must present when the platform is going into
> sleep/hibernate mode. +
> +Optional SoC Specific Properties:
> +- pinctrl-names: Contains only one value - "default".
> +- pintctrl-0: Specifies the pin control groups used for this controller.
> +
> +Example (for ARM-based BeagleBoard xM with ST33ZP24 on I2C2):
> +
> +&i2c2 {
> +
> +        status = "okay";
> +
> +        st33zp24: st33zp24@13 {
> +
> +                compatible = "st,st33zp24_i2c";
> +
> +                reg = <0x013>;
> +                clock-frequency = <400000>;
> +
> +                interrupt-parent = <&gpio5>;
> +                interrupts = <7 IRQ_TYPE_LEVEL_HIGH>;
> +
> +                lpcpd-gpios = <&gpio5 15 GPIO_ACTIVE_HIGH>;
> +        };
> +};


Thanks,
Peter
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Re: [PATCH v4 00/15] ST33 I2C TPM driver cleanup

[Peter Hüwe]

Hi Christophe,

sorry for the late reply :/
 
> This new patchset version is taking into account as much as possible
> Jason Gunthorpe feedbacks. I hope, i am not missing any.
> 
> It still brings:
> - Some few code clean up from code style up to structure
> - Device tree support keeping static platform data configuration support.
> - Fixes & improvement for irq support.
> - Update the GPLv2 license header
> 
> I am also adding the mention Reviewed-By: Jason Gunthorpe
> <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org> on all those patches.
> Jason, please feel free to let me know if i am mistaking here. :).
> 
> This patchset apply on top of James Morris linux-security tree

Unfortunately I get compile warnings:

/data/data-old/linux-2.6/drivers/char/tpm/tpm_i2c_stm_st33.c: In function 
'tpm_stm_i2c_probe':
/data/data-old/linux-2.6/drivers/char/tpm/tpm_i2c_stm_st33.c:748:3: warning: 
passing argument 1 of 'tpm_stm_i2c_of_request_resources' from incompatible 
pointer type [enabled by default]
/data/data-old/linux-2.6/drivers/char/tpm/tpm_i2c_stm_st33.c:670:12: note: 
expected 'struct i2c_client *' but argument is of type 'struct tpm_chip *'
/data/data-old/linux-2.6/drivers/char/tpm/tpm_i2c_stm_st33.c:722:3: warning: 
'chip' may be used uninitialized in this function [-Wuninitialized]

Smatch complains:
/data/data-old/linux-2.6/drivers/char/tpm/tpm_i2c_stm_st33.c:722 
tpm_stm_i2c_probe() error: potentially dereferencing uninitialized 'chip'.



Can you fix this up?

(also if you redo the patchset, moving 
tpm/tpm_i2c_stm_st33: Fix potential bug in tpm_stm_i2c_send
to the front would be nice, as indicated by Jason on v3


Nitpick: maybe you could use ret instead of r in your return code cleanup.
I'm not a fan of one letter variables, except counters)


Peter


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Re: [PATCH v4 00/15] ST33 I2C TPM driver cleanup

[Christophe RICARD]

Hi Peter,

Thank you for your feedback (on Sunday :)).

To be honest i missed those warnings. I figured they come when CONFIG_OF
is not set :/.

No problem to send a v5 with tpm/tpm_i2c_stm_st33: Fix potential bug in
tpm_stm_i2c_send and replace r by ret. The purpose here was more to
have a kind of convention inside the driver rather than mixing
r/ret/err.

I hope to send this by tonight.

Best Regards
Christophe

On Sun, 30 Nov 2014 14:37:18 +0100
Peter Hüwe <PeterHuewe-Mmb7MZpHnFY@public.gmane.org> wrote:

> Hi Christophe,
> 
> sorry for the late reply :/
>  
> > This new patchset version is taking into account as much as possible
> > Jason Gunthorpe feedbacks. I hope, i am not missing any.
> > 
> > It still brings:
> > - Some few code clean up from code style up to structure
> > - Device tree support keeping static platform data configuration
> > support.
> > - Fixes & improvement for irq support.
> > - Update the GPLv2 license header
> > 
> > I am also adding the mention Reviewed-By: Jason Gunthorpe
> > <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org> on all those patches.
> > Jason, please feel free to let me know if i am mistaking here. :).
> > 
> > This patchset apply on top of James Morris linux-security tree
> 
> Unfortunately I get compile warnings:
> 
> /data/data-old/linux-2.6/drivers/char/tpm/tpm_i2c_stm_st33.c: In
> function 'tpm_stm_i2c_probe':
> /data/data-old/linux-2.6/drivers/char/tpm/tpm_i2c_stm_st33.c:748:3:
> warning: passing argument 1 of 'tpm_stm_i2c_of_request_resources'
> from incompatible pointer type [enabled by default]
> /data/data-old/linux-2.6/drivers/char/tpm/tpm_i2c_stm_st33.c:670:12:
> note: expected 'struct i2c_client *' but argument is of type 'struct
> tpm_chip
> *' /data/data-old/linux-2.6/drivers/char/tpm/tpm_i2c_stm_st33.c:722:3:
> warning: 'chip' may be used uninitialized in this function
> [-Wuninitialized]
> 
> Smatch complains:
> /data/data-old/linux-2.6/drivers/char/tpm/tpm_i2c_stm_st33.c:722 
> tpm_stm_i2c_probe() error: potentially dereferencing uninitialized
> 'chip'.
> 
> 
> 
> Can you fix this up?
> 
> (also if you redo the patchset, moving 
> tpm/tpm_i2c_stm_st33: Fix potential bug in tpm_stm_i2c_send
> to the front would be nice, as indicated by Jason on v3
> 
> 
> Nitpick: maybe you could use ret instead of r in your return code
> cleanup. I'm not a fan of one letter variables, except counters)
> 
> 
> Peter
> 
> 

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Re: [PATCH v4 00/15] ST33 I2C TPM driver cleanup

[Peter Hüwe]

Hi Christophe,

> Thank you for your feedback (on Sunday :)).
> 
> To be honest i missed those warnings. I figured they come when CONFIG_OF
> is not set :/.
> 
> No problem to send a v5 with tpm/tpm_i2c_stm_st33: Fix potential bug in
> tpm_stm_i2c_send and replace r by ret. The purpose here was more to
> have a kind of convention inside the driver rather than mixing
> r/ret/err.
> 
> I hope to send this by tonight.

Would be great! - usually I try to sort this stuff out myself, but this is not 
possible at the moment.


Thanks,
Peter
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