xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

drivers/misc/ad525x_dpot.c: new features

Browse Source 
Add support for AD5270, AD5271, AD5272, AD5274 digital potentiometers.
Add 20-TP feature for AD5291 and AD5292 parts, and update feature list.
AD5291 rdac read back must be shifted by two.

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Cc: Mike Frysinger <vapier@gentoo.org>
Cc: Chris Verges <chrisv@cyberswitching.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Michael Hennerich
2010-10-26 14:22:36 -07:00
committed by Linus Torvalds
parent 5f400cf40f
commit a4bd394956
5 changed files with 123 additions and 14 deletions
Download Patch File Download Diff File Expand all files Collapse all files

107
drivers/misc/ad525x_dpot.c
View File

@@ -29,9 +29,9 @@
* AD5262 2 256 20, 50, 200
* AD5263 4 256 20, 50, 200
* AD5290 1 256 10, 50, 100
* AD5291 1 256 20
* AD5292 1 1024 20
* AD5293 1 1024 20
* AD5291 1 256 20, 50, 100 (20-TP)
* AD5292 1 1024 20, 50, 100 (20-TP)
* AD5293 1 1024 20, 50, 100
* AD7376 1 128 10, 50, 100, 1M
* AD8400 1 256 1, 10, 50, 100
* AD8402 2 256 1, 10, 50, 100
@@ -52,6 +52,10 @@
* AD5170 1 256 2.5, 10, 50, 100 (OTP)
* AD5172 2 256 2.5, 10, 50, 100 (OTP)
* AD5173 2 256 2.5, 10, 50, 100 (OTP)
* AD5270 1 1024 20, 50, 100 (50-TP)
* AD5271 1 256 20, 50, 100 (50-TP)
* AD5272 1 1024 20, 50, 100 (50-TP)
* AD5274 1 256 20, 50, 100 (50-TP)
*
* See Documentation/misc-devices/ad525x_dpot.txt for more info.
*
@@ -126,18 +130,38 @@ static inline int dpot_write_r8d16(struct dpot_data *dpot, u8 reg, u16 val)
static s32 dpot_read_spi(struct dpot_data *dpot, u8 reg)
{
unsigned ctrl = 0;
int value;
if (!(reg & (DPOT_ADDR_EEPROM | DPOT_ADDR_CMD))) {
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->uid == DPOT_UID(AD5293_ID)) {
value = dpot_read_r8d8(dpot,
DPOT_AD5291_READ_RDAC << 2);
if (dpot->uid == DPOT_UID(AD5291_ID))
value = value >> 2;
return value;
} else if (dpot->uid == DPOT_UID(AD5270_ID) ||
dpot->uid == DPOT_UID(AD5271_ID)) {
value = dpot_read_r8d8(dpot,
DPOT_AD5270_1_2_4_READ_RDAC << 2);
if (value < 0)
return value;
if (dpot->uid == DPOT_UID(AD5271_ID))
value = value >> 2;
return value;
}
ctrl = DPOT_SPI_READ_RDAC;
} else if (reg & DPOT_ADDR_EEPROM) {
ctrl = DPOT_SPI_READ_EEPROM;
@@ -153,6 +177,7 @@ static s32 dpot_read_spi(struct dpot_data *dpot, u8 reg)
static s32 dpot_read_i2c(struct dpot_data *dpot, u8 reg)
{
int value;
unsigned ctrl = 0;
switch (dpot->uid) {
case DPOT_UID(AD5246_ID):
@@ -177,6 +202,25 @@ static s32 dpot_read_i2c(struct dpot_data *dpot, u8 reg)
ctrl = ((reg & DPOT_RDAC_MASK) == DPOT_RDAC0) ?
0 : DPOT_AD5172_3_A0;
return dpot_read_r8d8(dpot, ctrl);
case DPOT_UID(AD5272_ID):
case DPOT_UID(AD5274_ID):
dpot_write_r8d8(dpot,
(DPOT_AD5270_1_2_4_READ_RDAC << 2), 0);
value = dpot_read_r8d16(dpot,
DPOT_AD5270_1_2_4_RDAC << 2);
if (value < 0)
return value;
/*
* AD5272/AD5274 returns high byte first, however
* underling smbus expects low byte first.
*/
value = swab16(value);
if (dpot->uid == DPOT_UID(AD5271_ID))
value = value >> 2;
return value;
default:
if ((reg & DPOT_REG_TOL) || (dpot->max_pos > 256))
return dpot_read_r8d16(dpot, (reg & 0xF8) |
@@ -198,7 +242,7 @@ static s32 dpot_write_spi(struct dpot_data *dpot, u8 reg, u16 value)
{
unsigned val = 0;
if (!(reg & (DPOT_ADDR_EEPROM | DPOT_ADDR_CMD))) {
if (!(reg & (DPOT_ADDR_EEPROM | DPOT_ADDR_CMD | DPOT_ADDR_OTP))) {
if (dpot->feat & F_RDACS_WONLY)
dpot->rdac_cache[reg & DPOT_RDAC_MASK] = value;
@@ -219,11 +263,30 @@ static s32 dpot_write_spi(struct dpot_data *dpot, u8 reg, u16 value)
} else {
if (dpot->uid == DPOT_UID(AD5291_ID) ||
dpot->uid == DPOT_UID(AD5292_ID) ||
dpot->uid == DPOT_UID(AD5293_ID))
dpot->uid == DPOT_UID(AD5293_ID)) {
dpot_write_r8d8(dpot, DPOT_AD5291_CTRLREG << 2,
DPOT_AD5291_UNLOCK_CMD);
if (dpot->uid == DPOT_UID(AD5291_ID))
value = value << 2;
return dpot_write_r8d8(dpot,
(DPOT_AD5291_RDAC << 2) |
(value >> 8), value & 0xFF);
} else if (dpot->uid == DPOT_UID(AD5270_ID) ||
dpot->uid == DPOT_UID(AD5271_ID)) {
dpot_write_r8d8(dpot,
DPOT_AD5270_1_2_4_CTRLREG << 2,
DPOT_AD5270_1_2_4_UNLOCK_CMD);
if (dpot->uid == DPOT_UID(AD5271_ID))
value = value << 2;
return dpot_write_r8d8(dpot,
(DPOT_AD5270_1_2_4_RDAC << 2) |
(value >> 8), value & 0xFF);
}
val = DPOT_SPI_RDAC | (reg & DPOT_RDAC_MASK);
}
} else if (reg & DPOT_ADDR_EEPROM) {
@@ -243,6 +306,16 @@ static s32 dpot_write_spi(struct dpot_data *dpot, u8 reg, u16 value)
val = DPOT_SPI_INC_ALL;
break;
}
} else if (reg & DPOT_ADDR_OTP) {
if (dpot->uid == DPOT_UID(AD5291_ID) ||
dpot->uid == DPOT_UID(AD5292_ID)) {
return dpot_write_r8d8(dpot,
DPOT_AD5291_STORE_XTPM << 2, 0);
} else if (dpot->uid == DPOT_UID(AD5270_ID) ||
dpot->uid == DPOT_UID(AD5271_ID)) {
return dpot_write_r8d8(dpot,
DPOT_AD5270_1_2_4_STORE_XTPM << 2, 0);
}
} else
BUG();
@@ -303,10 +376,25 @@ static s32 dpot_write_i2c(struct dpot_data *dpot, u8 reg, u16 value)
tmp = dpot_read_r8d16(dpot, tmp);
if (tmp >> 14) /* Ready to Program? */
return -EFAULT;
ctrl = DPOT_AD5270_2_3_FUSE;
ctrl = DPOT_AD5170_2_3_FUSE;
}
return dpot_write_r8d8(dpot, ctrl, value);
break;
case DPOT_UID(AD5272_ID):
case DPOT_UID(AD5274_ID):
dpot_write_r8d8(dpot, DPOT_AD5270_1_2_4_CTRLREG << 2,
DPOT_AD5270_1_2_4_UNLOCK_CMD);
if (reg & DPOT_ADDR_OTP)
return dpot_write_r8d8(dpot,
DPOT_AD5270_1_2_4_STORE_XTPM << 2, 0);
if (dpot->uid == DPOT_UID(AD5274_ID))
value = value << 2;
return dpot_write_r8d8(dpot, (DPOT_AD5270_1_2_4_RDAC << 2) |
(value >> 8), value & 0xFF);
break;
default:
if (reg & DPOT_ADDR_CMD)
return dpot_write_d8(dpot, reg);
@@ -320,7 +408,6 @@ static s32 dpot_write_i2c(struct dpot_data *dpot, u8 reg, u16 value)
}
}
static s32 dpot_write(struct dpot_data *dpot, u8 reg, u16 value)
{
if (dpot->feat & F_SPI)