4 files changed, 66 insertions, 7 deletions

diff --git a/include/linux/spi/ads7846.h b/include/linux/spi/ads7846.h
index adb3dafd33e..3387e44dfd1 100644
--- a/include/linux/spi/ads7846.h
+++ b/include/linux/spi/ads7846.h
@@ -5,9 +5,17 @@
  *
  * It's OK if the min/max values are zero.
  */
+enum ads7846_filter {
+	ADS7846_FILTER_OK,
+	ADS7846_FILTER_REPEAT,
+	ADS7846_FILTER_IGNORE,
+};
+
 struct ads7846_platform_data {
 	u16	model;			/* 7843, 7845, 7846. */
 	u16	vref_delay_usecs;	/* 0 for external vref; etc */
+	int	keep_vref_on:1;		/* set to keep vref on for differential
+					 * measurements as well */
 	u16	x_plate_ohms;
 	u16	y_plate_ohms;
 
@@ -21,5 +29,9 @@ struct ads7846_platform_data {
 	u16	debounce_rep;		/* additional consecutive good readings
 					 * required after the first two */
 	int	(*get_pendown_state)(void);
+	int	(*filter_init)	(struct ads7846_platform_data *pdata,
+				 void **filter_data);
+	int	(*filter)	(void *filter_data, int data_idx, int *val);
+	void	(*filter_cleanup)(void *filter_data);
 };
 
diff --git a/include/linux/spi/eeprom.h b/include/linux/spi/eeprom.h
new file mode 100644
index 00000000000..1085212c446
--- /dev/null
+++ b/include/linux/spi/eeprom.h
@@ -0,0 +1,22 @@
+#ifndef __LINUX_SPI_EEPROM_H
+#define __LINUX_SPI_EEPROM_H
+
+/*
+ * Put one of these structures in platform_data for SPI EEPROMS handled
+ * by the "at25" driver.  On SPI, most EEPROMS understand the same core
+ * command set.  If you need to support EEPROMs that don't yet fit, add
+ * flags to support those protocol options.  These values all come from
+ * the chip datasheets.
+ */
+struct spi_eeprom {
+	u32		byte_len;
+	char		name[10];
+	u16		page_size;		/* for writes */
+	u16		flags;
+#define	EE_ADDR1	0x0001			/*  8 bit addrs */
+#define	EE_ADDR2	0x0002			/* 16 bit addrs */
+#define	EE_ADDR3	0x0004			/* 24 bit addrs */
+#define	EE_READONLY	0x0008			/* disallow writes */
+};
+
+#endif /* __LINUX_SPI_EEPROM_H */
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index 176f6e36dbf..4f0f8c2e58a 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -114,6 +114,17 @@ static inline void spi_set_ctldata(struct spi_device *spi, void *state)
 	spi->controller_state = state;
 }
 
+/* device driver data */
+
+static inline void spi_set_drvdata(struct spi_device *spi, void *data)
+{
+	dev_set_drvdata(&spi->dev, data);
+}
+
+static inline void *spi_get_drvdata(struct spi_device *spi)
+{
+	return dev_get_drvdata(&spi->dev);
+}
 
 struct spi_message;
 
@@ -137,13 +148,11 @@ extern int spi_register_driver(struct spi_driver *sdrv);
 
 static inline void spi_unregister_driver(struct spi_driver *sdrv)
 {
-	if (!sdrv)
-		return;
-	driver_unregister(&sdrv->driver);
+	if (sdrv)
+		driver_unregister(&sdrv->driver);
 }
 
 
-
 /**
  * struct spi_master - interface to SPI master controller
  * @cdev: class interface to this driver
@@ -154,7 +163,8 @@ static inline void spi_unregister_driver(struct spi_driver *sdrv)
  *	each slave has a chipselect signal, but it's common that not
  *	every chipselect is connected to a slave.
  * @setup: updates the device mode and clocking records used by a
- *	device's SPI controller; protocol code may call this.
+ *	device's SPI controller; protocol code may call this.  This
+ *	must fail if an unrecognized or unsupported mode is requested.
  * @transfer: adds a message to the controller's transfer queue.
  * @cleanup: frees controller-specific state
  *
@@ -211,7 +221,7 @@ struct spi_master {
 						struct spi_message *mesg);
 
 	/* called on release() to free memory provided by spi_master */
-	void			(*cleanup)(const struct spi_device *spi);
+	void			(*cleanup)(struct spi_device *spi);
 };
 
 static inline void *spi_master_get_devdata(struct spi_master *master)
@@ -296,6 +306,16 @@ extern struct spi_master *spi_busnum_to_master(u16 busnum);
  * shifting out three bytes with word size of sixteen or twenty bits;
  * the former uses two bytes per word, the latter uses four bytes.)
  *
+ * In-memory data values are always in native CPU byte order, translated
+ * from the wire byte order (big-endian except with SPI_LSB_FIRST).  So
+ * for example when bits_per_word is sixteen, buffers are 2N bytes long
+ * and hold N sixteen bit words in CPU byte order.
+ *
+ * When the word size of the SPI transfer is not a power-of-two multiple
+ * of eight bits, those in-memory words include extra bits.  In-memory
+ * words are always seen by protocol drivers as right-justified, so the
+ * undefined (rx) or unused (tx) bits are always the most significant bits.
+ *
  * All SPI transfers start with the relevant chipselect active.  Normally
  * it stays selected until after the last transfer in a message.  Drivers
  * can affect the chipselect signal using cs_change:
@@ -453,6 +473,11 @@ static inline void spi_message_free(struct spi_message *m)
  * changes those settings, and must be called from a context that can sleep.
  * The changes take effect the next time the device is selected and data
  * is transferred to or from it.
+ *
+ * Note that this call wil fail if the protocol driver specifies an option
+ * that the underlying controller or its driver does not support.  For
+ * example, not all hardware supports wire transfers using nine bit words,
+ * LSB-first wire encoding, or active-high chipselects.
  */
 static inline int
 spi_setup(struct spi_device *spi)
diff --git a/include/linux/spi/spi_bitbang.h b/include/linux/spi/spi_bitbang.h
index 16ce178f54d..2e8c048b9b8 100644
--- a/include/linux/spi/spi_bitbang.h
+++ b/include/linux/spi/spi_bitbang.h
@@ -55,7 +55,7 @@ struct spi_bitbang {
  * methods, if you like.
  */
 extern int spi_bitbang_setup(struct spi_device *spi);
-extern void spi_bitbang_cleanup(const struct spi_device *spi);
+extern void spi_bitbang_cleanup(struct spi_device *spi);
 extern int spi_bitbang_transfer(struct spi_device *spi, struct spi_message *m);
 extern int spi_bitbang_setup_transfer(struct spi_device *spi,
 				      struct spi_transfer *t);