ad525x_dpot: add support for SPI parts

Split the bus logic out into separate files so that we can handle I2C and
SPI busses independently.  The new SPI bus logic brings in support for a
lot more parts:

	AD5160, AD5161, AD5162, AD5165, AD5200, AD5201, AD5203,
	AD5204, AD5206, AD5207, AD5231, AD5232, AD5233, AD5235,
	AD5260, AD5262, AD5263, AD5290, AD5291, AD5292, AD5293,
	AD7376, AD8400, AD8402, AD8403, ADN2850

[randy.dunlap@oracle.com: fix ad525X_dpot build]
Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 173 insertions, 0 deletions

diff --git a/drivers/misc/ad525x_dpot.h b/drivers/misc/ad525x_dpot.h
new file mode 100644
index 000000000000..99b388e12f5f
--- /dev/null
+++ b/drivers/misc/ad525x_dpot.h
@@ -0,0 +1,173 @@
+/*
+ * Driver for the Analog Devices digital potentiometers
+ *
+ * Copyright (C) 2010 Michael Hennerich, Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#ifndef _AD_DPOT_H_
+#define _AD_DPOT_H_
+
+#include <linux/types.h>
+
+#define DPOT_CONF(features, wipers, max_pos, uid) \
+		(((features) << 18) | (((wipers) & 0xFF) << 10) | \
+		((max_pos & 0xF) << 6) | (uid & 0x3F))
+
+#define DPOT_UID(conf) (conf & 0x3F)
+#define DPOT_MAX_POS(conf) ((conf >> 6) & 0xF)
+#define DPOT_WIPERS(conf) ((conf >> 10) & 0xFF)
+#define DPOT_FEAT(conf) (conf >> 18)
+
+#define BRDAC0	(1 << 0)
+#define BRDAC1	(1 << 1)
+#define BRDAC2	(1 << 2)
+#define BRDAC3	(1 << 3)
+#define BRDAC4	(1 << 4)
+#define BRDAC5	(1 << 5)
+
+#define F_CMD_INC		(1 << 0)	/* Features INC/DEC ALL, 6dB */
+#define F_CMD_EEP		(1 << 1)	/* Features EEPROM */
+#define F_CMD_TOL		(1 << 2)	/* RDACS are Read/Write + Tolerance REG */
+#define F_RDACS_RW		(1 << 3)	/* RDACS are Read/Write + Tolerance REG */
+#define F_RDACS_WONLY		(1 << 4)	/* RDACS are Write only */
+#define F_AD_APPDATA		(1 << 5)	/* RDAC Address append to data */
+#define F_SPI_8BIT		(1 << 6)	/* All SPI XFERS are 8-bit */
+#define F_SPI_16BIT		(1 << 7)	/* All SPI XFERS are 16-bit */
+#define F_SPI_24BIT		(1 << 8)	/* All SPI XFERS are 24-bit */
+
+#define F_RDACS_RW_TOL	(F_RDACS_RW | F_CMD_EEP | F_CMD_TOL)
+#define F_RDACS_RW_EEP	(F_RDACS_RW | F_CMD_EEP)
+#define F_SPI		(F_SPI_8BIT | F_SPI_16BIT | F_SPI_24BIT)
+
+enum dpot_devid {
+	AD5258_ID = DPOT_CONF(F_RDACS_RW_TOL, BRDAC0, 6, 0), /* I2C */
+	AD5259_ID = DPOT_CONF(F_RDACS_RW_TOL, BRDAC0, 8, 1),
+	AD5251_ID = DPOT_CONF(F_RDACS_RW_TOL | F_CMD_INC,
+			BRDAC0 | BRDAC3, 6, 2),
+	AD5252_ID = DPOT_CONF(F_RDACS_RW_TOL | F_CMD_INC,
+			BRDAC0 | BRDAC3, 8, 3),
+	AD5253_ID = DPOT_CONF(F_RDACS_RW_TOL | F_CMD_INC,
+			BRDAC0 | BRDAC1 | BRDAC2 | BRDAC3, 6, 4),
+	AD5254_ID = DPOT_CONF(F_RDACS_RW_TOL | F_CMD_INC,
+			BRDAC0 | BRDAC1 | BRDAC2 | BRDAC3, 8, 5),
+	AD5255_ID = DPOT_CONF(F_RDACS_RW_TOL | F_CMD_INC,
+			BRDAC0 | BRDAC1 | BRDAC2, 9, 6),
+	AD5160_ID = DPOT_CONF(F_RDACS_WONLY | F_AD_APPDATA | F_SPI_8BIT,
+			BRDAC0, 8, 7), /* SPI */
+	AD5161_ID = DPOT_CONF(F_RDACS_WONLY | F_AD_APPDATA | F_SPI_8BIT,
+			BRDAC0, 8, 8),
+	AD5162_ID = DPOT_CONF(F_RDACS_WONLY | F_AD_APPDATA | F_SPI_16BIT,
+			BRDAC0 | BRDAC1, 8, 9),
+	AD5165_ID = DPOT_CONF(F_RDACS_WONLY | F_AD_APPDATA | F_SPI_8BIT,
+			BRDAC0, 8, 10),
+	AD5200_ID = DPOT_CONF(F_RDACS_WONLY | F_AD_APPDATA | F_SPI_8BIT,
+			BRDAC0, 8, 11),
+	AD5201_ID = DPOT_CONF(F_RDACS_WONLY | F_AD_APPDATA | F_SPI_8BIT,
+			BRDAC0, 5, 12),
+	AD5203_ID = DPOT_CONF(F_RDACS_WONLY | F_AD_APPDATA | F_SPI_8BIT,
+			BRDAC0 | BRDAC1 | BRDAC2 | BRDAC3, 6, 13),
+	AD5204_ID = DPOT_CONF(F_RDACS_WONLY | F_AD_APPDATA | F_SPI_16BIT,
+			BRDAC0 | BRDAC1 | BRDAC2 | BRDAC3, 8, 14),
+	AD5206_ID = DPOT_CONF(F_RDACS_WONLY | F_AD_APPDATA | F_SPI_16BIT,
+			BRDAC0 | BRDAC1 | BRDAC2 | BRDAC3 | BRDAC4 | BRDAC5,
+			8, 15),
+	AD5207_ID = DPOT_CONF(F_RDACS_WONLY | F_AD_APPDATA | F_SPI_16BIT,
+			BRDAC0 | BRDAC1, 8, 16),
+	AD5231_ID = DPOT_CONF(F_RDACS_RW_EEP | F_CMD_INC | F_SPI_24BIT,
+			BRDAC0, 10, 17),
+	AD5232_ID = DPOT_CONF(F_RDACS_RW_EEP | F_CMD_INC | F_SPI_16BIT,
+			BRDAC0 | BRDAC1, 8, 18),
+	AD5233_ID = DPOT_CONF(F_RDACS_RW_EEP | F_CMD_INC | F_SPI_16BIT,
+			BRDAC0 | BRDAC1 | BRDAC2 | BRDAC3, 6, 19),
+	AD5235_ID = DPOT_CONF(F_RDACS_RW_EEP | F_CMD_INC | F_SPI_24BIT,
+			BRDAC0 | BRDAC1, 10, 20),
+	AD5260_ID = DPOT_CONF(F_RDACS_WONLY | F_AD_APPDATA | F_SPI_8BIT,
+			BRDAC0, 8, 21),
+	AD5262_ID = DPOT_CONF(F_RDACS_WONLY | F_AD_APPDATA | F_SPI_16BIT,
+			BRDAC0 | BRDAC1, 8, 22),
+	AD5263_ID = DPOT_CONF(F_RDACS_WONLY | F_AD_APPDATA | F_SPI_16BIT,
+			BRDAC0 | BRDAC1 | BRDAC2 | BRDAC3, 8, 23),
+	AD5290_ID = DPOT_CONF(F_RDACS_WONLY | F_AD_APPDATA | F_SPI_8BIT,
+			BRDAC0, 8, 24),
+	AD5291_ID = DPOT_CONF(F_RDACS_RW | F_SPI_16BIT, BRDAC0, 8, 25),
+	AD5292_ID = DPOT_CONF(F_RDACS_RW | F_SPI_16BIT, BRDAC0, 10, 26),
+	AD5293_ID = DPOT_CONF(F_RDACS_RW | F_SPI_16BIT, BRDAC0, 10, 27),
+	AD7376_ID = DPOT_CONF(F_RDACS_WONLY | F_AD_APPDATA | F_SPI_8BIT,
+			BRDAC0, 7, 28),
+	AD8400_ID = DPOT_CONF(F_RDACS_WONLY | F_AD_APPDATA | F_SPI_8BIT,
+			BRDAC0, 8, 29),
+	AD8402_ID = DPOT_CONF(F_RDACS_WONLY | F_AD_APPDATA | F_SPI_16BIT,
+			BRDAC0 | BRDAC1, 8, 30),
+	AD8403_ID = DPOT_CONF(F_RDACS_WONLY | F_AD_APPDATA | F_SPI_16BIT,
+			BRDAC0 | BRDAC1 | BRDAC2, 8, 31),
+	ADN2850_ID = DPOT_CONF(F_RDACS_RW_EEP | F_CMD_INC | F_SPI_24BIT,
+			BRDAC0 | BRDAC1, 10, 32),
+};
+
+#define DPOT_RDAC0		0
+#define DPOT_RDAC1		1
+#define DPOT_RDAC2		2
+#define DPOT_RDAC3		3
+#define DPOT_RDAC4		4
+#define DPOT_RDAC5		5
+
+#define DPOT_RDAC_MASK		0x1F
+
+#define DPOT_REG_TOL		0x18
+#define DPOT_TOL_RDAC0		(DPOT_REG_TOL | DPOT_RDAC0)
+#define DPOT_TOL_RDAC1		(DPOT_REG_TOL | DPOT_RDAC1)
+#define DPOT_TOL_RDAC2		(DPOT_REG_TOL | DPOT_RDAC2)
+#define DPOT_TOL_RDAC3		(DPOT_REG_TOL | DPOT_RDAC3)
+#define DPOT_TOL_RDAC4		(DPOT_REG_TOL | DPOT_RDAC4)
+#define DPOT_TOL_RDAC5		(DPOT_REG_TOL | DPOT_RDAC5)
+
+/* RDAC-to-EEPROM Interface Commands */
+#define DPOT_ADDR_RDAC		(0x00 << 5)
+#define DPOT_ADDR_EEPROM	(0x01 << 5)
+#define DPOT_ADDR_CMD		(0x80)
+
+#define DPOT_DEC_ALL_6DB	(DPOT_ADDR_CMD | (0x4 << 3))
+#define DPOT_INC_ALL_6DB	(DPOT_ADDR_CMD | (0x9 << 3))
+#define DPOT_DEC_ALL		(DPOT_ADDR_CMD | (0x6 << 3))
+#define DPOT_INC_ALL		(DPOT_ADDR_CMD | (0xB << 3))
+
+#define DPOT_SPI_RDAC		0xB0
+#define DPOT_SPI_EEPROM		0x30
+#define DPOT_SPI_READ_RDAC	0xA0
+#define DPOT_SPI_READ_EEPROM	0x90
+#define DPOT_SPI_DEC_ALL_6DB	0x50
+#define DPOT_SPI_INC_ALL_6DB	0xD0
+#define DPOT_SPI_DEC_ALL	0x70
+#define DPOT_SPI_INC_ALL	0xF0
+
+/* AD5291/2/3 use special commands */
+#define DPOT_AD5291_RDAC	0x01
+#define DPOT_AD5291_READ_RDAC	0x02
+
+struct dpot_data;
+
+struct ad_dpot_bus_ops {
+	int (*read_d8) (void *client);
+	int (*read_r8d8) (void *client, u8 reg);
+	int (*read_r8d16) (void *client, u8 reg);
+	int (*write_d8) (void *client, u8 val);
+	int (*write_r8d8) (void *client, u8 reg, u8 val);
+	int (*write_r8d16) (void *client, u8 reg, u16 val);
+};
+
+struct ad_dpot_bus_data {
+	void *client;
+	const struct ad_dpot_bus_ops *bops;
+};
+
+struct ad_dpot_id {
+	char *name;
+	unsigned long devid;
+};
+
+int ad_dpot_probe(struct device *dev, struct ad_dpot_bus_data *bdata, const struct ad_dpot_id *id);
+int ad_dpot_remove(struct device *dev);
+
+#endif