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drivers/misc/ad525x_dpot.c
20.2 KB
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/* |
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* ad525x_dpot: Driver for the Analog Devices digital potentiometers * Copyright (c) 2009-2010 Analog Devices, Inc. |
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* Author: Michael Hennerich <hennerich@blackfin.uclinux.org> * * DEVID #Wipers #Positions Resistor Options (kOhm) * AD5258 1 64 1, 10, 50, 100 * AD5259 1 256 5, 10, 50, 100 * AD5251 2 64 1, 10, 50, 100 * AD5252 2 256 1, 10, 50, 100 * AD5255 3 512 25, 250 * AD5253 4 64 1, 10, 50, 100 * AD5254 4 256 1, 10, 50, 100 |
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* AD5160 1 256 5, 10, 50, 100 * AD5161 1 256 5, 10, 50, 100 * AD5162 2 256 2.5, 10, 50, 100 * AD5165 1 256 100 * AD5200 1 256 10, 50 * AD5201 1 33 10, 50 * AD5203 4 64 10, 100 * AD5204 4 256 10, 50, 100 * AD5206 6 256 10, 50, 100 * AD5207 2 256 10, 50, 100 * AD5231 1 1024 10, 50, 100 * AD5232 2 256 10, 50, 100 * AD5233 4 64 10, 50, 100 * AD5235 2 1024 25, 250 * AD5260 1 256 20, 50, 200 * AD5262 2 256 20, 50, 200 * AD5263 4 256 20, 50, 200 * AD5290 1 256 10, 50, 100 |
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* AD5291 1 256 20, 50, 100 (20-TP) * AD5292 1 1024 20, 50, 100 (20-TP) * AD5293 1 1024 20, 50, 100 |
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* AD7376 1 128 10, 50, 100, 1M * AD8400 1 256 1, 10, 50, 100 * AD8402 2 256 1, 10, 50, 100 * AD8403 4 256 1, 10, 50, 100 * ADN2850 3 512 25, 250 |
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* 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 |
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* AD5280 1 256 20, 50, 200 * AD5282 2 256 20, 50, 200 * ADN2860 3 512 25, 250 |
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* AD5273 1 64 1, 10, 50, 100 (OTP) * AD5171 1 64 5, 10, 50, 100 (OTP) * 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) |
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* 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) |
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* * See Documentation/misc-devices/ad525x_dpot.txt for more info. * * derived from ad5258.c * Copyright (c) 2009 Cyber Switching, Inc. * Author: Chris Verges <chrisv@cyberswitching.com> * * derived from ad5252.c |
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* Copyright (c) 2006-2011 Michael Hennerich <hennerich@blackfin.uclinux.org> |
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* * Licensed under the GPL-2 or later. */ #include <linux/module.h> #include <linux/device.h> #include <linux/kernel.h> #include <linux/init.h> |
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#include <linux/delay.h> |
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#include <linux/slab.h> |
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|
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#include "ad525x_dpot.h" |
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/* * Client data (each client gets its own) */ struct dpot_data { |
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struct ad_dpot_bus_data bdata; |
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struct mutex update_lock; unsigned rdac_mask; unsigned max_pos; |
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unsigned long devid; unsigned uid; unsigned feat; unsigned wipers; |
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u16 rdac_cache[MAX_RDACS]; DECLARE_BITMAP(otp_en_mask, MAX_RDACS); |
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}; |
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static inline int dpot_read_d8(struct dpot_data *dpot) { return dpot->bdata.bops->read_d8(dpot->bdata.client); } static inline int dpot_read_r8d8(struct dpot_data *dpot, u8 reg) { return dpot->bdata.bops->read_r8d8(dpot->bdata.client, reg); } static inline int dpot_read_r8d16(struct dpot_data *dpot, u8 reg) { return dpot->bdata.bops->read_r8d16(dpot->bdata.client, reg); } static inline int dpot_write_d8(struct dpot_data *dpot, u8 val) { return dpot->bdata.bops->write_d8(dpot->bdata.client, val); } static inline int dpot_write_r8d8(struct dpot_data *dpot, u8 reg, u16 val) { return dpot->bdata.bops->write_r8d8(dpot->bdata.client, reg, val); } 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); } |
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static s32 dpot_read_spi(struct dpot_data *dpot, u8 reg) |
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{ |
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unsigned ctrl = 0; |
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int value; |
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|
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if (!(reg & (DPOT_ADDR_EEPROM | DPOT_ADDR_CMD))) { |
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|
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if (dpot->feat & F_RDACS_WONLY) return dpot->rdac_cache[reg & DPOT_RDAC_MASK]; |
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if (dpot->uid == DPOT_UID(AD5291_ID) || dpot->uid == DPOT_UID(AD5292_ID) || |
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dpot->uid == DPOT_UID(AD5293_ID)) { value = dpot_read_r8d8(dpot, |
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DPOT_AD5291_READ_RDAC << 2); |
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|
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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; } |
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ctrl = DPOT_SPI_READ_RDAC; } else if (reg & DPOT_ADDR_EEPROM) { ctrl = DPOT_SPI_READ_EEPROM; } |
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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); |
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return -EFAULT; } |
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static s32 dpot_read_i2c(struct dpot_data *dpot, u8 reg) { |
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int value; |
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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): |
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case DPOT_UID(AD5280_ID): case DPOT_UID(AD5282_ID): |
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ctrl = ((reg & DPOT_RDAC_MASK) == DPOT_RDAC0) ? |
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0 : DPOT_AD5282_RDAC_AB; |
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return dpot_read_r8d8(dpot, ctrl); |
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case DPOT_UID(AD5170_ID): case DPOT_UID(AD5171_ID): case DPOT_UID(AD5273_ID): return dpot_read_d8(dpot); case DPOT_UID(AD5172_ID): case DPOT_UID(AD5173_ID): ctrl = ((reg & DPOT_RDAC_MASK) == DPOT_RDAC0) ? |
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0 : DPOT_AD5172_3_A0; |
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return dpot_read_r8d8(dpot, ctrl); |
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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; |
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default: |
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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); |
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} |
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} |
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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) |
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{ unsigned val = 0; |
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if (!(reg & (DPOT_ADDR_EEPROM | DPOT_ADDR_CMD | DPOT_ADDR_OTP))) { |
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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) || |
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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; |
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return dpot_write_r8d8(dpot, (DPOT_AD5291_RDAC << 2) | (value >> 8), value & 0xFF); |
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} 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; |
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return dpot_write_r8d8(dpot, (DPOT_AD5270_1_2_4_RDAC << 2) | (value >> 8), value & 0xFF); } |
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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; } |
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} 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); } |
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} 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); |
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return -EFAULT; } |
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static s32 dpot_write_i2c(struct dpot_data *dpot, u8 reg, u16 value) { /* Only write the instruction byte for certain commands */ |
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unsigned tmp = 0, ctrl = 0; |
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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): |
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case DPOT_UID(AD5280_ID): case DPOT_UID(AD5282_ID): ctrl = ((reg & DPOT_RDAC_MASK) == DPOT_RDAC0) ? |
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0 : DPOT_AD5282_RDAC_AB; |
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return dpot_write_r8d8(dpot, ctrl, value); break; |
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case DPOT_UID(AD5171_ID): case DPOT_UID(AD5273_ID): if (reg & DPOT_ADDR_OTP) { tmp = dpot_read_d8(dpot); if (tmp >> 6) /* Ready to Program? */ return -EFAULT; ctrl = DPOT_AD5273_FUSE; } return dpot_write_r8d8(dpot, ctrl, value); break; case DPOT_UID(AD5172_ID): case DPOT_UID(AD5173_ID): ctrl = ((reg & DPOT_RDAC_MASK) == DPOT_RDAC0) ? |
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0 : DPOT_AD5172_3_A0; |
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if (reg & DPOT_ADDR_OTP) { tmp = dpot_read_r8d16(dpot, ctrl); if (tmp >> 14) /* Ready to Program? */ return -EFAULT; |
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ctrl |= DPOT_AD5170_2_3_FUSE; |
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} return dpot_write_r8d8(dpot, ctrl, value); break; case DPOT_UID(AD5170_ID): if (reg & DPOT_ADDR_OTP) { tmp = dpot_read_r8d16(dpot, tmp); if (tmp >> 14) /* Ready to Program? */ return -EFAULT; |
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ctrl = DPOT_AD5170_2_3_FUSE; |
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} return dpot_write_r8d8(dpot, ctrl, value); break; |
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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; |
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default: |
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if (reg & DPOT_ADDR_CMD) return dpot_write_d8(dpot, reg); |
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|
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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); |
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} } |
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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); } |
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/* sysfs functions */ static ssize_t sysfs_show_reg(struct device *dev, |
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struct device_attribute *attr, 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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if (reg & DPOT_ADDR_OTP_EN) return sprintf(buf, "%s ", test_bit(DPOT_RDAC_MASK & reg, data->otp_en_mask) ? "enabled" : "disabled"); |
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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); if (value < 0) return -EINVAL; /* * Let someone else deal with converting this ... * the tolerance is a two-byte value where the MSB * is a sign + integer value, and the LSB is a * decimal value. See page 18 of the AD5258 * datasheet (Rev. A) for more details. */ |
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if (reg & DPOT_REG_TOL) |
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return sprintf(buf, "0x%04x ", value & 0xFFFF); else return sprintf(buf, "%u ", value & data->rdac_mask); } static ssize_t sysfs_set_reg(struct device *dev, struct device_attribute *attr, const char *buf, size_t count, u32 reg) { |
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struct dpot_data *data = dev_get_drvdata(dev); |
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unsigned long value; int err; |
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if (reg & DPOT_ADDR_OTP_EN) { if (!strncmp(buf, "enabled", sizeof("enabled"))) set_bit(DPOT_RDAC_MASK & reg, data->otp_en_mask); else clear_bit(DPOT_RDAC_MASK & reg, data->otp_en_mask); return count; } if ((reg & DPOT_ADDR_OTP) && !test_bit(DPOT_RDAC_MASK & reg, data->otp_en_mask)) return -EPERM; |
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err = strict_strtoul(buf, 10, &value); if (err) return err; if (value > data->rdac_mask) value = data->rdac_mask; mutex_lock(&data->update_lock); |
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dpot_write(data, reg, value); if (reg & DPOT_ADDR_EEPROM) |
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msleep(26); /* Sleep while the EEPROM updates */ |
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else if (reg & DPOT_ADDR_OTP) msleep(400); /* Sleep while the OTP updates */ |
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mutex_unlock(&data->update_lock); return count; } static ssize_t sysfs_do_cmd(struct device *dev, struct device_attribute *attr, const char *buf, size_t count, u32 reg) { |
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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); return count; } /* ------------------------------------------------------------------------- */ |
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#define DPOT_DEVICE_SHOW(_name, _reg) static ssize_t \ show_##_name(struct device *dev, \ struct device_attribute *attr, char *buf) \ { \ return sysfs_show_reg(dev, attr, buf, _reg); \ |
4eb174bee ad525x_dpot: new ... |
498 |
} |
0993dbedf ad525x_dpot: simp... |
499 500 501 502 503 504 |
#define DPOT_DEVICE_SET(_name, _reg) static ssize_t \ set_##_name(struct device *dev, \ struct device_attribute *attr, \ const char *buf, size_t count) \ { \ return sysfs_set_reg(dev, attr, buf, count, _reg); \ |
4eb174bee ad525x_dpot: new ... |
505 |
} |
0993dbedf ad525x_dpot: simp... |
506 507 508 509 |
#define DPOT_DEVICE_SHOW_SET(name, reg) \ DPOT_DEVICE_SHOW(name, reg) \ DPOT_DEVICE_SET(name, reg) \ static DEVICE_ATTR(name, S_IWUSR | S_IRUGO, show_##name, set_##name); |
4eb174bee ad525x_dpot: new ... |
510 |
|
0993dbedf ad525x_dpot: simp... |
511 512 513 |
#define DPOT_DEVICE_SHOW_ONLY(name, reg) \ DPOT_DEVICE_SHOW(name, reg) \ static DEVICE_ATTR(name, S_IWUSR | S_IRUGO, show_##name, NULL); |
4eb174bee ad525x_dpot: new ... |
514 |
|
6c536e4ce ad525x_dpot: add ... |
515 516 517 |
DPOT_DEVICE_SHOW_SET(rdac0, DPOT_ADDR_RDAC | DPOT_RDAC0); DPOT_DEVICE_SHOW_SET(eeprom0, DPOT_ADDR_EEPROM | DPOT_RDAC0); DPOT_DEVICE_SHOW_ONLY(tolerance0, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC0); |
59592d0cc ad525x_dpot: add ... |
518 519 |
DPOT_DEVICE_SHOW_SET(otp0, DPOT_ADDR_OTP | DPOT_RDAC0); DPOT_DEVICE_SHOW_SET(otp0en, DPOT_ADDR_OTP_EN | DPOT_RDAC0); |
6c536e4ce ad525x_dpot: add ... |
520 521 522 523 |
DPOT_DEVICE_SHOW_SET(rdac1, DPOT_ADDR_RDAC | DPOT_RDAC1); DPOT_DEVICE_SHOW_SET(eeprom1, DPOT_ADDR_EEPROM | DPOT_RDAC1); DPOT_DEVICE_SHOW_ONLY(tolerance1, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC1); |
59592d0cc ad525x_dpot: add ... |
524 525 |
DPOT_DEVICE_SHOW_SET(otp1, DPOT_ADDR_OTP | DPOT_RDAC1); DPOT_DEVICE_SHOW_SET(otp1en, DPOT_ADDR_OTP_EN | DPOT_RDAC1); |
6c536e4ce ad525x_dpot: add ... |
526 527 528 529 |
DPOT_DEVICE_SHOW_SET(rdac2, DPOT_ADDR_RDAC | DPOT_RDAC2); DPOT_DEVICE_SHOW_SET(eeprom2, DPOT_ADDR_EEPROM | DPOT_RDAC2); DPOT_DEVICE_SHOW_ONLY(tolerance2, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC2); |
59592d0cc ad525x_dpot: add ... |
530 531 |
DPOT_DEVICE_SHOW_SET(otp2, DPOT_ADDR_OTP | DPOT_RDAC2); DPOT_DEVICE_SHOW_SET(otp2en, DPOT_ADDR_OTP_EN | DPOT_RDAC2); |
6c536e4ce ad525x_dpot: add ... |
532 533 534 535 |
DPOT_DEVICE_SHOW_SET(rdac3, DPOT_ADDR_RDAC | DPOT_RDAC3); DPOT_DEVICE_SHOW_SET(eeprom3, DPOT_ADDR_EEPROM | DPOT_RDAC3); DPOT_DEVICE_SHOW_ONLY(tolerance3, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC3); |
59592d0cc ad525x_dpot: add ... |
536 537 |
DPOT_DEVICE_SHOW_SET(otp3, DPOT_ADDR_OTP | DPOT_RDAC3); DPOT_DEVICE_SHOW_SET(otp3en, DPOT_ADDR_OTP_EN | DPOT_RDAC3); |
6c536e4ce ad525x_dpot: add ... |
538 539 540 541 |
DPOT_DEVICE_SHOW_SET(rdac4, DPOT_ADDR_RDAC | DPOT_RDAC4); DPOT_DEVICE_SHOW_SET(eeprom4, DPOT_ADDR_EEPROM | DPOT_RDAC4); DPOT_DEVICE_SHOW_ONLY(tolerance4, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC4); |
59592d0cc ad525x_dpot: add ... |
542 543 |
DPOT_DEVICE_SHOW_SET(otp4, DPOT_ADDR_OTP | DPOT_RDAC4); DPOT_DEVICE_SHOW_SET(otp4en, DPOT_ADDR_OTP_EN | DPOT_RDAC4); |
6c536e4ce ad525x_dpot: add ... |
544 545 546 547 |
DPOT_DEVICE_SHOW_SET(rdac5, DPOT_ADDR_RDAC | DPOT_RDAC5); DPOT_DEVICE_SHOW_SET(eeprom5, DPOT_ADDR_EEPROM | DPOT_RDAC5); DPOT_DEVICE_SHOW_ONLY(tolerance5, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC5); |
59592d0cc ad525x_dpot: add ... |
548 549 |
DPOT_DEVICE_SHOW_SET(otp5, DPOT_ADDR_OTP | DPOT_RDAC5); DPOT_DEVICE_SHOW_SET(otp5en, DPOT_ADDR_OTP_EN | DPOT_RDAC5); |
6c536e4ce ad525x_dpot: add ... |
550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 |
static const struct attribute *dpot_attrib_wipers[] = { &dev_attr_rdac0.attr, &dev_attr_rdac1.attr, &dev_attr_rdac2.attr, &dev_attr_rdac3.attr, &dev_attr_rdac4.attr, &dev_attr_rdac5.attr, NULL }; static const struct attribute *dpot_attrib_eeprom[] = { &dev_attr_eeprom0.attr, &dev_attr_eeprom1.attr, &dev_attr_eeprom2.attr, &dev_attr_eeprom3.attr, &dev_attr_eeprom4.attr, &dev_attr_eeprom5.attr, NULL |
4eb174bee ad525x_dpot: new ... |
569 |
}; |
59592d0cc ad525x_dpot: add ... |
570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 |
static const struct attribute *dpot_attrib_otp[] = { &dev_attr_otp0.attr, &dev_attr_otp1.attr, &dev_attr_otp2.attr, &dev_attr_otp3.attr, &dev_attr_otp4.attr, &dev_attr_otp5.attr, NULL }; static const struct attribute *dpot_attrib_otp_en[] = { &dev_attr_otp0en.attr, &dev_attr_otp1en.attr, &dev_attr_otp2en.attr, &dev_attr_otp3en.attr, &dev_attr_otp4en.attr, &dev_attr_otp5en.attr, NULL }; |
6c536e4ce ad525x_dpot: add ... |
589 590 591 592 593 594 595 596 |
static const struct attribute *dpot_attrib_tolerance[] = { &dev_attr_tolerance0.attr, &dev_attr_tolerance1.attr, &dev_attr_tolerance2.attr, &dev_attr_tolerance3.attr, &dev_attr_tolerance4.attr, &dev_attr_tolerance5.attr, NULL |
4eb174bee ad525x_dpot: new ... |
597 598 599 |
}; /* ------------------------------------------------------------------------- */ |
0993dbedf ad525x_dpot: simp... |
600 601 602 603 604 605 606 607 |
#define DPOT_DEVICE_DO_CMD(_name, _cmd) static ssize_t \ set_##_name(struct device *dev, \ struct device_attribute *attr, \ const char *buf, size_t count) \ { \ return sysfs_do_cmd(dev, attr, buf, count, _cmd); \ } \ static DEVICE_ATTR(_name, S_IWUSR | S_IRUGO, NULL, set_##_name); |
6c536e4ce ad525x_dpot: add ... |
608 609 610 611 |
DPOT_DEVICE_DO_CMD(inc_all, DPOT_INC_ALL); DPOT_DEVICE_DO_CMD(dec_all, DPOT_DEC_ALL); DPOT_DEVICE_DO_CMD(inc_all_6db, DPOT_INC_ALL_6DB); DPOT_DEVICE_DO_CMD(dec_all_6db, DPOT_DEC_ALL_6DB); |
4eb174bee ad525x_dpot: new ... |
612 613 614 615 616 617 618 619 620 621 622 623 |
static struct attribute *ad525x_attributes_commands[] = { &dev_attr_inc_all.attr, &dev_attr_dec_all.attr, &dev_attr_inc_all_6db.attr, &dev_attr_dec_all_6db.attr, NULL }; static const struct attribute_group ad525x_group_commands = { .attrs = ad525x_attributes_commands, }; |
6c536e4ce ad525x_dpot: add ... |
624 625 |
__devinit int ad_dpot_add_files(struct device *dev, unsigned features, unsigned rdac) |
4eb174bee ad525x_dpot: new ... |
626 |
{ |
6c536e4ce ad525x_dpot: add ... |
627 628 629 630 631 632 633 634 |
int err = sysfs_create_file(&dev->kobj, dpot_attrib_wipers[rdac]); if (features & F_CMD_EEP) err |= sysfs_create_file(&dev->kobj, dpot_attrib_eeprom[rdac]); if (features & F_CMD_TOL) err |= sysfs_create_file(&dev->kobj, dpot_attrib_tolerance[rdac]); |
59592d0cc ad525x_dpot: add ... |
635 636 637 638 639 640 |
if (features & F_CMD_OTP) { err |= sysfs_create_file(&dev->kobj, dpot_attrib_otp_en[rdac]); err |= sysfs_create_file(&dev->kobj, dpot_attrib_otp[rdac]); } |
4eb174bee ad525x_dpot: new ... |
641 |
|
6c536e4ce ad525x_dpot: add ... |
642 643 644 645 646 647 |
if (err) dev_err(dev, "failed to register sysfs hooks for RDAC%d ", rdac); return err; |
4eb174bee ad525x_dpot: new ... |
648 |
} |
6c536e4ce ad525x_dpot: add ... |
649 650 |
inline void ad_dpot_remove_files(struct device *dev, unsigned features, unsigned rdac) |
4eb174bee ad525x_dpot: new ... |
651 |
{ |
6c536e4ce ad525x_dpot: add ... |
652 653 654 655 656 657 658 659 |
sysfs_remove_file(&dev->kobj, dpot_attrib_wipers[rdac]); if (features & F_CMD_EEP) sysfs_remove_file(&dev->kobj, dpot_attrib_eeprom[rdac]); if (features & F_CMD_TOL) sysfs_remove_file(&dev->kobj, dpot_attrib_tolerance[rdac]); |
59592d0cc ad525x_dpot: add ... |
660 661 662 663 664 665 |
if (features & F_CMD_OTP) { sysfs_remove_file(&dev->kobj, dpot_attrib_otp_en[rdac]); sysfs_remove_file(&dev->kobj, dpot_attrib_otp[rdac]); } |
4eb174bee ad525x_dpot: new ... |
666 |
} |
7f3379de9 misc: ad525x_dpot... |
667 668 669 |
int __devinit ad_dpot_probe(struct device *dev, struct ad_dpot_bus_data *bdata, unsigned long devid, const char *name) |
4eb174bee ad525x_dpot: new ... |
670 |
{ |
4eb174bee ad525x_dpot: new ... |
671 |
|
6c536e4ce ad525x_dpot: add ... |
672 673 |
struct dpot_data *data; int i, err = 0; |
4eb174bee ad525x_dpot: new ... |
674 675 676 677 678 679 |
data = kzalloc(sizeof(struct dpot_data), GFP_KERNEL); if (!data) { err = -ENOMEM; goto exit; } |
6c536e4ce ad525x_dpot: add ... |
680 |
dev_set_drvdata(dev, data); |
4eb174bee ad525x_dpot: new ... |
681 |
mutex_init(&data->update_lock); |
6c536e4ce ad525x_dpot: add ... |
682 |
data->bdata = *bdata; |
7f3379de9 misc: ad525x_dpot... |
683 |
data->devid = devid; |
6c536e4ce ad525x_dpot: add ... |
684 |
|
7f3379de9 misc: ad525x_dpot... |
685 |
data->max_pos = 1 << DPOT_MAX_POS(devid); |
6c536e4ce ad525x_dpot: add ... |
686 |
data->rdac_mask = data->max_pos - 1; |
7f3379de9 misc: ad525x_dpot... |
687 688 689 |
data->feat = DPOT_FEAT(devid); data->uid = DPOT_UID(devid); data->wipers = DPOT_WIPERS(devid); |
6c536e4ce ad525x_dpot: add ... |
690 |
|
59592d0cc ad525x_dpot: add ... |
691 |
for (i = DPOT_RDAC0; i < MAX_RDACS; i++) |
6c536e4ce ad525x_dpot: add ... |
692 693 694 695 696 697 698 699 700 701 702 |
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); |
4eb174bee ad525x_dpot: new ... |
703 704 705 706 707 708 |
if (err) { dev_err(dev, "failed to register sysfs hooks "); goto exit_free; } |
4eb174bee ad525x_dpot: new ... |
709 710 |
dev_info(dev, "%s %d-Position Digital Potentiometer registered ", |
7f3379de9 misc: ad525x_dpot... |
711 |
name, data->max_pos); |
4eb174bee ad525x_dpot: new ... |
712 713 |
return 0; |
6c536e4ce ad525x_dpot: add ... |
714 |
exit_remove_files: |
59592d0cc ad525x_dpot: add ... |
715 |
for (i = DPOT_RDAC0; i < MAX_RDACS; i++) |
6c536e4ce ad525x_dpot: add ... |
716 717 |
if (data->wipers & (1 << i)) ad_dpot_remove_files(dev, data->feat, i); |
4eb174bee ad525x_dpot: new ... |
718 719 |
exit_free: kfree(data); |
6c536e4ce ad525x_dpot: add ... |
720 |
dev_set_drvdata(dev, NULL); |
4eb174bee ad525x_dpot: new ... |
721 |
exit: |
6c536e4ce ad525x_dpot: add ... |
722 723 |
dev_err(dev, "failed to create client for %s ID 0x%lX ", |
7f3379de9 misc: ad525x_dpot... |
724 |
name, devid); |
4eb174bee ad525x_dpot: new ... |
725 726 |
return err; } |
6c536e4ce ad525x_dpot: add ... |
727 |
EXPORT_SYMBOL(ad_dpot_probe); |
4eb174bee ad525x_dpot: new ... |
728 |
|
6c536e4ce ad525x_dpot: add ... |
729 |
__devexit int ad_dpot_remove(struct device *dev) |
4eb174bee ad525x_dpot: new ... |
730 |
{ |
6c536e4ce ad525x_dpot: add ... |
731 732 |
struct dpot_data *data = dev_get_drvdata(dev); int i; |
59592d0cc ad525x_dpot: add ... |
733 |
for (i = DPOT_RDAC0; i < MAX_RDACS; i++) |
6c536e4ce ad525x_dpot: add ... |
734 735 |
if (data->wipers & (1 << i)) ad_dpot_remove_files(dev, data->feat, i); |
4eb174bee ad525x_dpot: new ... |
736 |
|
4eb174bee ad525x_dpot: new ... |
737 738 739 740 |
kfree(data); return 0; } |
6c536e4ce ad525x_dpot: add ... |
741 |
EXPORT_SYMBOL(ad_dpot_remove); |
4eb174bee ad525x_dpot: new ... |
742 |
|
4eb174bee ad525x_dpot: new ... |
743 744 |
MODULE_AUTHOR("Chris Verges <chrisv@cyberswitching.com>, " |
6c536e4ce ad525x_dpot: add ... |
745 746 |
"Michael Hennerich <hennerich@blackfin.uclinux.org>"); MODULE_DESCRIPTION("Digital potentiometer driver"); |
4eb174bee ad525x_dpot: new ... |
747 |
MODULE_LICENSE("GPL"); |