ad525x_dpot: add support for AD524x pots
Michael Hennerich [Mon, 24 May 2010 21:33:15 +0000 (14:33 -0700)]
New parts supported:
AD5241, AD5242, AD5243, AD5245, AD5246, AD5247, AD5248

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/misc/Kconfig
drivers/misc/ad525x_dpot-i2c.c
drivers/misc/ad525x_dpot.c
drivers/misc/ad525x_dpot.h

index 69e019e..90c3415 100644 (file)
@@ -22,7 +22,8 @@ config AD525X_DPOT
          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
+         AD7376, AD8400, AD8402, AD8403, ADN2850, AD5241, AD5242,
+         AD5243, AD5245, AD5246, AD5247, AD5248
          digital potentiometer chips.
 
          See Documentation/misc-devices/ad525x_dpot.txt for the
index 971e61d..0dfad4e 100644 (file)
@@ -87,6 +87,13 @@ static const struct i2c_device_id ad_dpot_id[] = {
        {"ad5253", AD5253_ID},
        {"ad5254", AD5254_ID},
        {"ad5255", AD5255_ID},
+       {"ad5241", AD5241_ID},
+       {"ad5242", AD5242_ID},
+       {"ad5243", AD5243_ID},
+       {"ad5245", AD5245_ID},
+       {"ad5246", AD5246_ID},
+       {"ad5247", AD5247_ID},
+       {"ad5248", AD5248_ID},
        {}
 };
 MODULE_DEVICE_TABLE(i2c, ad_dpot_id);
index a41c2de..35a4c4b 100644 (file)
  * AD8402              2               256             1, 10, 50, 100
  * AD8403              4               256             1, 10, 50, 100
  * ADN2850             3               512             25, 250
+ * AD5241              1               256             10, 100, 1M
+ * AD5246              1               128             5, 10, 50, 100
+ * AD5247              1               128             5, 10, 50, 100
+ * AD5245              1               256             5, 10, 50, 100
+ * AD5243              2               256             2.5, 10, 50, 100
+ * AD5248              2               256             2.5, 10, 50, 100
+ * AD5242              2               256             20, 50, 200
  *
  * See Documentation/misc-devices/ad525x_dpot.txt for more info.
  *
@@ -107,118 +114,169 @@ static inline int dpot_write_r8d16(struct dpot_data *dpot, u8 reg, u16 val)
        return dpot->bdata.bops->write_r8d16(dpot->bdata.client, reg, val);
 }
 
-static s32 dpot_read(struct dpot_data *dpot, u8 reg)
+static s32 dpot_read_spi(struct dpot_data *dpot, u8 reg)
 {
-       unsigned val = 0;
+       unsigned ctrl = 0;
 
-       if (dpot->feat & F_SPI) {
-               if (!(reg & (DPOT_ADDR_EEPROM | DPOT_ADDR_CMD))) {
+       if (!(reg & (DPOT_ADDR_EEPROM | DPOT_ADDR_CMD))) {
 
-                       if (dpot->feat & F_RDACS_WONLY)
-                               return dpot->rdac_cache[reg & DPOT_RDAC_MASK];
+               if (dpot->feat & F_RDACS_WONLY)
+                       return dpot->rdac_cache[reg & DPOT_RDAC_MASK];
 
-                       if (dpot->uid == DPOT_UID(AD5291_ID) ||
-                               dpot->uid == DPOT_UID(AD5292_ID) ||
-                               dpot->uid == DPOT_UID(AD5293_ID))
-                               return dpot_read_r8d8(dpot,
-                                       DPOT_AD5291_READ_RDAC << 2);
+               if (dpot->uid == DPOT_UID(AD5291_ID) ||
+                       dpot->uid == DPOT_UID(AD5292_ID) ||
+                       dpot->uid == DPOT_UID(AD5293_ID))
+                       return dpot_read_r8d8(dpot,
+                               DPOT_AD5291_READ_RDAC << 2);
 
-                       val = DPOT_SPI_READ_RDAC;
-               } else if (reg & DPOT_ADDR_EEPROM) {
-                       val = DPOT_SPI_READ_EEPROM;
-               }
+               ctrl = DPOT_SPI_READ_RDAC;
+       } else if (reg & DPOT_ADDR_EEPROM) {
+               ctrl = DPOT_SPI_READ_EEPROM;
+       }
 
-               if (dpot->feat & F_SPI_16BIT)
-                       return dpot_read_r8d8(dpot, val);
-               else if (dpot->feat & F_SPI_24BIT)
-                       return dpot_read_r8d16(dpot, val);
+       if (dpot->feat & F_SPI_16BIT)
+               return dpot_read_r8d8(dpot, ctrl);
+       else if (dpot->feat & F_SPI_24BIT)
+               return dpot_read_r8d16(dpot, ctrl);
 
-       } else { /* I2C */
+       return -EFAULT;
+}
 
+static s32 dpot_read_i2c(struct dpot_data *dpot, u8 reg)
+{
+       unsigned ctrl = 0;
+       switch (dpot->uid) {
+       case DPOT_UID(AD5246_ID):
+       case DPOT_UID(AD5247_ID):
+               return dpot_read_d8(dpot);
+       case DPOT_UID(AD5245_ID):
+       case DPOT_UID(AD5241_ID):
+       case DPOT_UID(AD5242_ID):
+       case DPOT_UID(AD5243_ID):
+       case DPOT_UID(AD5248_ID):
+               ctrl = ((reg & DPOT_RDAC_MASK) == DPOT_RDAC0) ?
+                       0 : DPOT_AD5291_RDAC_AB;
+               return dpot_read_r8d8(dpot, ctrl);
+       default:
                if ((reg & DPOT_REG_TOL) || (dpot->max_pos > 256))
                        return dpot_read_r8d16(dpot, (reg & 0xF8) |
                                        ((reg & 0x7) << 1));
                else
                        return dpot_read_r8d8(dpot, reg);
-
        }
-       return -EFAULT;
 }
 
-static s32 dpot_write(struct dpot_data *dpot, u8 reg, u16 value)
+static s32 dpot_read(struct dpot_data *dpot, u8 reg)
+{
+       if (dpot->feat & F_SPI)
+               return dpot_read_spi(dpot, reg);
+       else
+               return dpot_read_i2c(dpot, reg);
+}
+
+static s32 dpot_write_spi(struct dpot_data *dpot, u8 reg, u16 value)
 {
        unsigned val = 0;
 
-       if (dpot->feat & F_SPI) {
-               if (!(reg & (DPOT_ADDR_EEPROM | DPOT_ADDR_CMD))) {
-                       if (dpot->feat & F_RDACS_WONLY)
-                               dpot->rdac_cache[reg & DPOT_RDAC_MASK] = value;
-
-                       if (dpot->feat & F_AD_APPDATA) {
-                               if (dpot->feat & F_SPI_8BIT) {
-                                       val = ((reg & DPOT_RDAC_MASK) <<
-                                               DPOT_MAX_POS(dpot->devid)) |
-                                               value;
-                                       return dpot_write_d8(dpot, val);
-                               } else if (dpot->feat & F_SPI_16BIT) {
-                                       val = ((reg & DPOT_RDAC_MASK) <<
-                                               DPOT_MAX_POS(dpot->devid)) |
-                                               value;
-                                       return dpot_write_r8d8(dpot, val >> 8,
-                                               val & 0xFF);
-                               } else
-                                       BUG();
-                       } else {
-                               if (dpot->uid == DPOT_UID(AD5291_ID) ||
-                                       dpot->uid == DPOT_UID(AD5292_ID) ||
-                                       dpot->uid == DPOT_UID(AD5293_ID))
-                                       return dpot_write_r8d8(dpot,
-                                               (DPOT_AD5291_RDAC << 2) |
-                                               (value >> 8), value & 0xFF);
-
-                               val = DPOT_SPI_RDAC | (reg & DPOT_RDAC_MASK);
-                       }
-               } else if (reg & DPOT_ADDR_EEPROM) {
-                       val = DPOT_SPI_EEPROM | (reg & DPOT_RDAC_MASK);
-               } else if (reg & DPOT_ADDR_CMD) {
-                       switch (reg) {
-                       case DPOT_DEC_ALL_6DB:
-                               val = DPOT_SPI_DEC_ALL_6DB;
-                               break;
-                       case DPOT_INC_ALL_6DB:
-                               val = DPOT_SPI_INC_ALL_6DB;
-                               break;
-                       case DPOT_DEC_ALL:
-                               val = DPOT_SPI_DEC_ALL;
-                               break;
-                       case DPOT_INC_ALL:
-                               val = DPOT_SPI_INC_ALL;
-                               break;
-                       }
-               } else
-                       BUG();
-
-               if (dpot->feat & F_SPI_16BIT)
-                       return dpot_write_r8d8(dpot, val, value);
-               else if (dpot->feat & F_SPI_24BIT)
-                       return dpot_write_r8d16(dpot, val, value);
-       } else {
-               /* Only write the instruction byte for certain commands */
-               if (reg & DPOT_ADDR_CMD)
-                       return dpot_write_d8(dpot, reg);
-
-               if (dpot->max_pos > 256)
-                       return dpot_write_r8d16(dpot, (reg & 0xF8) |
-                                               ((reg & 0x7) << 1), value);
-               else
-                       /* All other registers require instruction + data bytes */
-                       return dpot_write_r8d8(dpot, reg, value);
+       if (!(reg & (DPOT_ADDR_EEPROM | DPOT_ADDR_CMD))) {
+               if (dpot->feat & F_RDACS_WONLY)
+                       dpot->rdac_cache[reg & DPOT_RDAC_MASK] = value;
+
+               if (dpot->feat & F_AD_APPDATA) {
+                       if (dpot->feat & F_SPI_8BIT) {
+                               val = ((reg & DPOT_RDAC_MASK) <<
+                                       DPOT_MAX_POS(dpot->devid)) |
+                                       value;
+                               return dpot_write_d8(dpot, val);
+                       } else if (dpot->feat & F_SPI_16BIT) {
+                               val = ((reg & DPOT_RDAC_MASK) <<
+                                       DPOT_MAX_POS(dpot->devid)) |
+                                       value;
+                               return dpot_write_r8d8(dpot, val >> 8,
+                                       val & 0xFF);
+                       } else
+                               BUG();
+               } else {
+                       if (dpot->uid == DPOT_UID(AD5291_ID) ||
+                               dpot->uid == DPOT_UID(AD5292_ID) ||
+                               dpot->uid == DPOT_UID(AD5293_ID))
+                               return dpot_write_r8d8(dpot,
+                                       (DPOT_AD5291_RDAC << 2) |
+                                       (value >> 8), value & 0xFF);
 
-       }
+                       val = DPOT_SPI_RDAC | (reg & DPOT_RDAC_MASK);
+               }
+       } else if (reg & DPOT_ADDR_EEPROM) {
+               val = DPOT_SPI_EEPROM | (reg & DPOT_RDAC_MASK);
+       } else if (reg & DPOT_ADDR_CMD) {
+               switch (reg) {
+               case DPOT_DEC_ALL_6DB:
+                       val = DPOT_SPI_DEC_ALL_6DB;
+                       break;
+               case DPOT_INC_ALL_6DB:
+                       val = DPOT_SPI_INC_ALL_6DB;
+                       break;
+               case DPOT_DEC_ALL:
+                       val = DPOT_SPI_DEC_ALL;
+                       break;
+               case DPOT_INC_ALL:
+                       val = DPOT_SPI_INC_ALL;
+                       break;
+               }
+       } else
+               BUG();
+
+       if (dpot->feat & F_SPI_16BIT)
+               return dpot_write_r8d8(dpot, val, value);
+       else if (dpot->feat & F_SPI_24BIT)
+               return dpot_write_r8d16(dpot, val, value);
 
        return -EFAULT;
 }
 
+static s32 dpot_write_i2c(struct dpot_data *dpot, u8 reg, u16 value)
+{
+       /* Only write the instruction byte for certain commands */
+       unsigned ctrl = 0;
+
+       switch (dpot->uid) {
+       case DPOT_UID(AD5246_ID):
+       case DPOT_UID(AD5247_ID):
+               return dpot_write_d8(dpot, value);
+               break;
+
+       case DPOT_UID(AD5245_ID):
+       case DPOT_UID(AD5241_ID):
+       case DPOT_UID(AD5242_ID):
+       case DPOT_UID(AD5243_ID):
+       case DPOT_UID(AD5248_ID):
+               ctrl = ((reg & DPOT_RDAC_MASK) == DPOT_RDAC0) ? 0 : DPOT_AD5291_RDAC_AB;
+               return dpot_write_r8d8(dpot, ctrl, value);
+               break;
+
+
+       default:
+       if (reg & DPOT_ADDR_CMD)
+               return dpot_write_d8(dpot, reg);
+
+       if (dpot->max_pos > 256)
+               return dpot_write_r8d16(dpot, (reg & 0xF8) |
+                                       ((reg & 0x7) << 1), value);
+       else
+               /* All other registers require instruction + data bytes */
+               return dpot_write_r8d8(dpot, reg, value);
+       }
+}
+
+
+static s32 dpot_write(struct dpot_data *dpot, u8 reg, u16 value)
+{
+       if (dpot->feat & F_SPI)
+               return dpot_write_spi(dpot, reg, value);
+       else
+               return dpot_write_i2c(dpot, reg, value);
+}
+
 /* sysfs functions */
 
 static ssize_t sysfs_show_reg(struct device *dev,
index 99b388e..849c5d0 100644 (file)
 
 #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_CMD_OTP              (1 << 2)        /* Features OTP */
+#define F_CMD_TOL              (1 << 3)        /* RDACS feature Tolerance REG */
+#define F_RDACS_RW             (1 << 4)        /* RDACS are Read/Write  */
+#define F_RDACS_WONLY          (1 << 5)        /* RDACS are Write only */
+#define F_AD_APPDATA           (1 << 6)        /* RDAC Address append to data */
+#define F_SPI_8BIT             (1 << 7)        /* All SPI XFERS are 8-bit */
+#define F_SPI_16BIT            (1 << 8)        /* All SPI XFERS are 16-bit */
+#define F_SPI_24BIT            (1 << 9)        /* 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)
@@ -104,6 +105,15 @@ enum dpot_devid {
                        BRDAC0 | BRDAC1 | BRDAC2, 8, 31),
        ADN2850_ID = DPOT_CONF(F_RDACS_RW_EEP | F_CMD_INC | F_SPI_24BIT,
                        BRDAC0 | BRDAC1, 10, 32),
+       AD5241_ID = DPOT_CONF(F_RDACS_RW, BRDAC0, 8, 33),
+       AD5242_ID = DPOT_CONF(F_RDACS_RW, BRDAC0 | BRDAC1, 8, 34),
+       AD5243_ID = DPOT_CONF(F_RDACS_RW, BRDAC0 | BRDAC1, 8, 35),
+       AD5245_ID = DPOT_CONF(F_RDACS_RW, BRDAC0, 8, 36),
+       AD5246_ID = DPOT_CONF(F_RDACS_RW, BRDAC0, 7, 37),
+       AD5247_ID = DPOT_CONF(F_RDACS_RW, BRDAC0, 7, 38),
+       AD5248_ID = DPOT_CONF(F_RDACS_RW, BRDAC0 | BRDAC1, 8, 39),
+
+
 };
 
 #define DPOT_RDAC0             0
@@ -146,6 +156,9 @@ enum dpot_devid {
 #define DPOT_AD5291_RDAC       0x01
 #define DPOT_AD5291_READ_RDAC  0x02
 
+/* AD524x use special commands */
+#define DPOT_AD5291_RDAC_AB    0x80
+
 struct dpot_data;
 
 struct ad_dpot_bus_ops {