6c536e4ce8
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>
512 lines
13 KiB
C
512 lines
13 KiB
C
/*
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* ad525x_dpot: Driver for the Analog Devices digital potentiometers
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* Copyright (c) 2009-2010 Analog Devices, Inc.
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* Author: Michael Hennerich <hennerich@blackfin.uclinux.org>
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*
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* DEVID #Wipers #Positions Resistor Options (kOhm)
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* AD5258 1 64 1, 10, 50, 100
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* AD5259 1 256 5, 10, 50, 100
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* AD5251 2 64 1, 10, 50, 100
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* AD5252 2 256 1, 10, 50, 100
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* AD5255 3 512 25, 250
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* AD5253 4 64 1, 10, 50, 100
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* AD5254 4 256 1, 10, 50, 100
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* AD5160 1 256 5, 10, 50, 100
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* AD5161 1 256 5, 10, 50, 100
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* AD5162 2 256 2.5, 10, 50, 100
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* AD5165 1 256 100
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* AD5200 1 256 10, 50
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* AD5201 1 33 10, 50
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* AD5203 4 64 10, 100
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* AD5204 4 256 10, 50, 100
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* AD5206 6 256 10, 50, 100
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* AD5207 2 256 10, 50, 100
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* AD5231 1 1024 10, 50, 100
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* AD5232 2 256 10, 50, 100
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* AD5233 4 64 10, 50, 100
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* AD5235 2 1024 25, 250
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* AD5260 1 256 20, 50, 200
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* AD5262 2 256 20, 50, 200
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* AD5263 4 256 20, 50, 200
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* AD5290 1 256 10, 50, 100
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* AD5291 1 256 20
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* AD5292 1 1024 20
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* AD5293 1 1024 20
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* AD7376 1 128 10, 50, 100, 1M
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* AD8400 1 256 1, 10, 50, 100
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* AD8402 2 256 1, 10, 50, 100
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* AD8403 4 256 1, 10, 50, 100
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* ADN2850 3 512 25, 250
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*
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* See Documentation/misc-devices/ad525x_dpot.txt for more info.
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*
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* derived from ad5258.c
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* Copyright (c) 2009 Cyber Switching, Inc.
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* Author: Chris Verges <chrisv@cyberswitching.com>
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*
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* derived from ad5252.c
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* Copyright (c) 2006 Michael Hennerich <hennerich@blackfin.uclinux.org>
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*
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* Licensed under the GPL-2 or later.
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*/
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/slab.h>
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#define DRIVER_VERSION "0.2"
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#include "ad525x_dpot.h"
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/*
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* Client data (each client gets its own)
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*/
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struct dpot_data {
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struct ad_dpot_bus_data bdata;
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struct mutex update_lock;
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unsigned rdac_mask;
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unsigned max_pos;
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unsigned long devid;
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unsigned uid;
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unsigned feat;
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unsigned wipers;
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u16 rdac_cache[8];
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};
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static inline int dpot_read_d8(struct dpot_data *dpot)
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{
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return dpot->bdata.bops->read_d8(dpot->bdata.client);
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}
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static inline int dpot_read_r8d8(struct dpot_data *dpot, u8 reg)
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{
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return dpot->bdata.bops->read_r8d8(dpot->bdata.client, reg);
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}
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static inline int dpot_read_r8d16(struct dpot_data *dpot, u8 reg)
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{
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return dpot->bdata.bops->read_r8d16(dpot->bdata.client, reg);
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}
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static inline int dpot_write_d8(struct dpot_data *dpot, u8 val)
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{
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return dpot->bdata.bops->write_d8(dpot->bdata.client, val);
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}
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static inline int dpot_write_r8d8(struct dpot_data *dpot, u8 reg, u16 val)
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{
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return dpot->bdata.bops->write_r8d8(dpot->bdata.client, reg, val);
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}
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static inline int dpot_write_r8d16(struct dpot_data *dpot, u8 reg, u16 val)
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{
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return dpot->bdata.bops->write_r8d16(dpot->bdata.client, reg, val);
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}
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static s32 dpot_read(struct dpot_data *dpot, u8 reg)
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{
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unsigned val = 0;
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if (dpot->feat & F_SPI) {
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if (!(reg & (DPOT_ADDR_EEPROM | DPOT_ADDR_CMD))) {
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if (dpot->feat & F_RDACS_WONLY)
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return dpot->rdac_cache[reg & DPOT_RDAC_MASK];
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if (dpot->uid == DPOT_UID(AD5291_ID) ||
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dpot->uid == DPOT_UID(AD5292_ID) ||
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dpot->uid == DPOT_UID(AD5293_ID))
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return dpot_read_r8d8(dpot,
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DPOT_AD5291_READ_RDAC << 2);
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val = DPOT_SPI_READ_RDAC;
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} else if (reg & DPOT_ADDR_EEPROM) {
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val = DPOT_SPI_READ_EEPROM;
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}
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if (dpot->feat & F_SPI_16BIT)
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return dpot_read_r8d8(dpot, val);
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else if (dpot->feat & F_SPI_24BIT)
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return dpot_read_r8d16(dpot, val);
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} else { /* I2C */
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if ((reg & DPOT_REG_TOL) || (dpot->max_pos > 256))
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return dpot_read_r8d16(dpot, (reg & 0xF8) |
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((reg & 0x7) << 1));
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else
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return dpot_read_r8d8(dpot, reg);
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}
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return -EFAULT;
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}
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static s32 dpot_write(struct dpot_data *dpot, u8 reg, u16 value)
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{
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unsigned val = 0;
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if (dpot->feat & F_SPI) {
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if (!(reg & (DPOT_ADDR_EEPROM | DPOT_ADDR_CMD))) {
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if (dpot->feat & F_RDACS_WONLY)
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dpot->rdac_cache[reg & DPOT_RDAC_MASK] = value;
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if (dpot->feat & F_AD_APPDATA) {
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if (dpot->feat & F_SPI_8BIT) {
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val = ((reg & DPOT_RDAC_MASK) <<
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DPOT_MAX_POS(dpot->devid)) |
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value;
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return dpot_write_d8(dpot, val);
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} else if (dpot->feat & F_SPI_16BIT) {
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val = ((reg & DPOT_RDAC_MASK) <<
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DPOT_MAX_POS(dpot->devid)) |
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value;
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return dpot_write_r8d8(dpot, val >> 8,
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val & 0xFF);
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} else
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BUG();
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} else {
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if (dpot->uid == DPOT_UID(AD5291_ID) ||
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dpot->uid == DPOT_UID(AD5292_ID) ||
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dpot->uid == DPOT_UID(AD5293_ID))
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return dpot_write_r8d8(dpot,
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(DPOT_AD5291_RDAC << 2) |
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(value >> 8), value & 0xFF);
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val = DPOT_SPI_RDAC | (reg & DPOT_RDAC_MASK);
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}
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} else if (reg & DPOT_ADDR_EEPROM) {
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val = DPOT_SPI_EEPROM | (reg & DPOT_RDAC_MASK);
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} else if (reg & DPOT_ADDR_CMD) {
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switch (reg) {
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case DPOT_DEC_ALL_6DB:
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val = DPOT_SPI_DEC_ALL_6DB;
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break;
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case DPOT_INC_ALL_6DB:
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val = DPOT_SPI_INC_ALL_6DB;
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break;
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case DPOT_DEC_ALL:
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val = DPOT_SPI_DEC_ALL;
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break;
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case DPOT_INC_ALL:
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val = DPOT_SPI_INC_ALL;
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break;
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}
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} else
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BUG();
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if (dpot->feat & F_SPI_16BIT)
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return dpot_write_r8d8(dpot, val, value);
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else if (dpot->feat & F_SPI_24BIT)
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return dpot_write_r8d16(dpot, val, value);
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} else {
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/* Only write the instruction byte for certain commands */
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if (reg & DPOT_ADDR_CMD)
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return dpot_write_d8(dpot, reg);
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if (dpot->max_pos > 256)
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return dpot_write_r8d16(dpot, (reg & 0xF8) |
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((reg & 0x7) << 1), value);
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else
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/* All other registers require instruction + data bytes */
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return dpot_write_r8d8(dpot, reg, value);
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}
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return -EFAULT;
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}
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/* sysfs functions */
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static ssize_t sysfs_show_reg(struct device *dev,
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struct device_attribute *attr,
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char *buf, u32 reg)
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{
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struct dpot_data *data = dev_get_drvdata(dev);
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s32 value;
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mutex_lock(&data->update_lock);
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value = dpot_read(data, reg);
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mutex_unlock(&data->update_lock);
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if (value < 0)
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return -EINVAL;
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/*
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* Let someone else deal with converting this ...
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* the tolerance is a two-byte value where the MSB
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* is a sign + integer value, and the LSB is a
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* decimal value. See page 18 of the AD5258
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* datasheet (Rev. A) for more details.
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*/
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if (reg & DPOT_REG_TOL)
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return sprintf(buf, "0x%04x\n", value & 0xFFFF);
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else
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return sprintf(buf, "%u\n", value & data->rdac_mask);
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}
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static ssize_t sysfs_set_reg(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count, u32 reg)
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{
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struct dpot_data *data = dev_get_drvdata(dev);
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unsigned long value;
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int err;
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err = strict_strtoul(buf, 10, &value);
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if (err)
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return err;
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if (value > data->rdac_mask)
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value = data->rdac_mask;
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mutex_lock(&data->update_lock);
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dpot_write(data, reg, value);
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if (reg & DPOT_ADDR_EEPROM)
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msleep(26); /* Sleep while the EEPROM updates */
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mutex_unlock(&data->update_lock);
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return count;
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}
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static ssize_t sysfs_do_cmd(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count, u32 reg)
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{
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struct dpot_data *data = dev_get_drvdata(dev);
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mutex_lock(&data->update_lock);
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dpot_write(data, reg, 0);
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mutex_unlock(&data->update_lock);
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return count;
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}
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/* ------------------------------------------------------------------------- */
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#define DPOT_DEVICE_SHOW(_name, _reg) static ssize_t \
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show_##_name(struct device *dev, \
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struct device_attribute *attr, char *buf) \
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{ \
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return sysfs_show_reg(dev, attr, buf, _reg); \
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}
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#define DPOT_DEVICE_SET(_name, _reg) static ssize_t \
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set_##_name(struct device *dev, \
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struct device_attribute *attr, \
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const char *buf, size_t count) \
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{ \
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return sysfs_set_reg(dev, attr, buf, count, _reg); \
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}
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#define DPOT_DEVICE_SHOW_SET(name, reg) \
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DPOT_DEVICE_SHOW(name, reg) \
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DPOT_DEVICE_SET(name, reg) \
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static DEVICE_ATTR(name, S_IWUSR | S_IRUGO, show_##name, set_##name);
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#define DPOT_DEVICE_SHOW_ONLY(name, reg) \
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DPOT_DEVICE_SHOW(name, reg) \
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static DEVICE_ATTR(name, S_IWUSR | S_IRUGO, show_##name, NULL);
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DPOT_DEVICE_SHOW_SET(rdac0, DPOT_ADDR_RDAC | DPOT_RDAC0);
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DPOT_DEVICE_SHOW_SET(eeprom0, DPOT_ADDR_EEPROM | DPOT_RDAC0);
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DPOT_DEVICE_SHOW_ONLY(tolerance0, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC0);
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DPOT_DEVICE_SHOW_SET(rdac1, DPOT_ADDR_RDAC | DPOT_RDAC1);
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DPOT_DEVICE_SHOW_SET(eeprom1, DPOT_ADDR_EEPROM | DPOT_RDAC1);
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DPOT_DEVICE_SHOW_ONLY(tolerance1, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC1);
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DPOT_DEVICE_SHOW_SET(rdac2, DPOT_ADDR_RDAC | DPOT_RDAC2);
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DPOT_DEVICE_SHOW_SET(eeprom2, DPOT_ADDR_EEPROM | DPOT_RDAC2);
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DPOT_DEVICE_SHOW_ONLY(tolerance2, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC2);
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DPOT_DEVICE_SHOW_SET(rdac3, DPOT_ADDR_RDAC | DPOT_RDAC3);
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DPOT_DEVICE_SHOW_SET(eeprom3, DPOT_ADDR_EEPROM | DPOT_RDAC3);
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DPOT_DEVICE_SHOW_ONLY(tolerance3, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC3);
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DPOT_DEVICE_SHOW_SET(rdac4, DPOT_ADDR_RDAC | DPOT_RDAC4);
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DPOT_DEVICE_SHOW_SET(eeprom4, DPOT_ADDR_EEPROM | DPOT_RDAC4);
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DPOT_DEVICE_SHOW_ONLY(tolerance4, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC4);
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DPOT_DEVICE_SHOW_SET(rdac5, DPOT_ADDR_RDAC | DPOT_RDAC5);
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DPOT_DEVICE_SHOW_SET(eeprom5, DPOT_ADDR_EEPROM | DPOT_RDAC5);
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DPOT_DEVICE_SHOW_ONLY(tolerance5, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC5);
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static const struct attribute *dpot_attrib_wipers[] = {
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&dev_attr_rdac0.attr,
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&dev_attr_rdac1.attr,
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&dev_attr_rdac2.attr,
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&dev_attr_rdac3.attr,
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&dev_attr_rdac4.attr,
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&dev_attr_rdac5.attr,
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NULL
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};
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static const struct attribute *dpot_attrib_eeprom[] = {
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&dev_attr_eeprom0.attr,
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&dev_attr_eeprom1.attr,
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&dev_attr_eeprom2.attr,
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&dev_attr_eeprom3.attr,
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&dev_attr_eeprom4.attr,
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&dev_attr_eeprom5.attr,
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NULL
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};
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static const struct attribute *dpot_attrib_tolerance[] = {
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&dev_attr_tolerance0.attr,
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&dev_attr_tolerance1.attr,
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&dev_attr_tolerance2.attr,
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&dev_attr_tolerance3.attr,
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&dev_attr_tolerance4.attr,
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&dev_attr_tolerance5.attr,
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NULL
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};
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/* ------------------------------------------------------------------------- */
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#define DPOT_DEVICE_DO_CMD(_name, _cmd) static ssize_t \
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set_##_name(struct device *dev, \
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struct device_attribute *attr, \
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const char *buf, size_t count) \
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{ \
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return sysfs_do_cmd(dev, attr, buf, count, _cmd); \
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} \
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static DEVICE_ATTR(_name, S_IWUSR | S_IRUGO, NULL, set_##_name);
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DPOT_DEVICE_DO_CMD(inc_all, DPOT_INC_ALL);
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DPOT_DEVICE_DO_CMD(dec_all, DPOT_DEC_ALL);
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DPOT_DEVICE_DO_CMD(inc_all_6db, DPOT_INC_ALL_6DB);
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DPOT_DEVICE_DO_CMD(dec_all_6db, DPOT_DEC_ALL_6DB);
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static struct attribute *ad525x_attributes_commands[] = {
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&dev_attr_inc_all.attr,
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&dev_attr_dec_all.attr,
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&dev_attr_inc_all_6db.attr,
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&dev_attr_dec_all_6db.attr,
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NULL
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};
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static const struct attribute_group ad525x_group_commands = {
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.attrs = ad525x_attributes_commands,
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};
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__devinit int ad_dpot_add_files(struct device *dev,
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unsigned features, unsigned rdac)
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{
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int err = sysfs_create_file(&dev->kobj,
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dpot_attrib_wipers[rdac]);
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if (features & F_CMD_EEP)
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err |= sysfs_create_file(&dev->kobj,
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dpot_attrib_eeprom[rdac]);
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if (features & F_CMD_TOL)
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err |= sysfs_create_file(&dev->kobj,
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dpot_attrib_tolerance[rdac]);
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if (err)
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dev_err(dev, "failed to register sysfs hooks for RDAC%d\n",
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rdac);
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return err;
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}
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inline void ad_dpot_remove_files(struct device *dev,
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unsigned features, unsigned rdac)
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{
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sysfs_remove_file(&dev->kobj,
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dpot_attrib_wipers[rdac]);
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if (features & F_CMD_EEP)
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sysfs_remove_file(&dev->kobj,
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dpot_attrib_eeprom[rdac]);
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if (features & F_CMD_TOL)
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sysfs_remove_file(&dev->kobj,
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dpot_attrib_tolerance[rdac]);
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}
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__devinit int ad_dpot_probe(struct device *dev,
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struct ad_dpot_bus_data *bdata, const struct ad_dpot_id *id)
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{
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struct dpot_data *data;
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int i, err = 0;
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data = kzalloc(sizeof(struct dpot_data), GFP_KERNEL);
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if (!data) {
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err = -ENOMEM;
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goto exit;
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}
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dev_set_drvdata(dev, data);
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mutex_init(&data->update_lock);
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data->bdata = *bdata;
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data->devid = id->devid;
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data->max_pos = 1 << DPOT_MAX_POS(data->devid);
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data->rdac_mask = data->max_pos - 1;
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data->feat = DPOT_FEAT(data->devid);
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data->uid = DPOT_UID(data->devid);
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data->wipers = DPOT_WIPERS(data->devid);
|
|
|
|
for (i = DPOT_RDAC0; i <= DPOT_RDAC5; i++)
|
|
if (data->wipers & (1 << i)) {
|
|
err = ad_dpot_add_files(dev, data->feat, i);
|
|
if (err)
|
|
goto exit_remove_files;
|
|
/* power-up midscale */
|
|
if (data->feat & F_RDACS_WONLY)
|
|
data->rdac_cache[i] = data->max_pos / 2;
|
|
}
|
|
|
|
if (data->feat & F_CMD_INC)
|
|
err = sysfs_create_group(&dev->kobj, &ad525x_group_commands);
|
|
|
|
if (err) {
|
|
dev_err(dev, "failed to register sysfs hooks\n");
|
|
goto exit_free;
|
|
}
|
|
|
|
dev_info(dev, "%s %d-Position Digital Potentiometer registered\n",
|
|
id->name, data->max_pos);
|
|
|
|
return 0;
|
|
|
|
exit_remove_files:
|
|
for (i = DPOT_RDAC0; i <= DPOT_RDAC5; i++)
|
|
if (data->wipers & (1 << i))
|
|
ad_dpot_remove_files(dev, data->feat, i);
|
|
|
|
exit_free:
|
|
kfree(data);
|
|
dev_set_drvdata(dev, NULL);
|
|
exit:
|
|
dev_err(dev, "failed to create client for %s ID 0x%lX\n",
|
|
id->name, id->devid);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(ad_dpot_probe);
|
|
|
|
__devexit int ad_dpot_remove(struct device *dev)
|
|
{
|
|
struct dpot_data *data = dev_get_drvdata(dev);
|
|
int i;
|
|
|
|
for (i = DPOT_RDAC0; i <= DPOT_RDAC5; i++)
|
|
if (data->wipers & (1 << i))
|
|
ad_dpot_remove_files(dev, data->feat, i);
|
|
|
|
kfree(data);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(ad_dpot_remove);
|
|
|
|
|
|
MODULE_AUTHOR("Chris Verges <chrisv@cyberswitching.com>, "
|
|
"Michael Hennerich <hennerich@blackfin.uclinux.org>");
|
|
MODULE_DESCRIPTION("Digital potentiometer driver");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_VERSION(DRIVER_VERSION);
|