/*************************************************************************** * __________ __ ___. * Open \______ \ ____ ____ | | _\_ |__ _______ ___ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ * \/ \/ \/ \/ \/ * $Id$ * * Copyright (C) 2012 Amaury Pouly * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY * KIND, either express or implied. * ****************************************************************************/ /** Driver for the Freescale MPR121 Capacitive Proximity Sensor */ #include "system.h" #include "mpr121.h" #include "i2c.h" /* Touch status: EL{0,7} */ #define REG_TOUCH_STATUS 0x00 #define REG_TOUCH_STATUS__ELE(x) (1 << (x)) /* Touch status: EL{8-11,prox}, overcurrent */ #define REG_TOUCH_STATUS2 0x01 #define REG_TOUCH_STATUS2__ELE(x) (1 << ((x) - 8)) #define REG_TOUCH_STATUS2__ELEPROX (1 << 4) #define REG_TOUCH_STATUS2__OVCF (1 << 7) /* Out of range: EL{0,7} */ #define REG_OOR_STATUS 0x02 #define REG_OOR_STATUS__ELE(x) (1 << (x)) /* Out of range: EL{8-11,prox}, autoconf err */ #define REG_OOR_STATUS2 0x03 #define REG_OOR_STATUS2__ELE(x) (1 << (x)) #define REG_OOR_STATUS2__ELEPROX (1 << 4) #define REG_OOR_STATUS2__ACFF (1 << 6) #define REG_OOR_STATUS2__ARFF (1 << 7) /* Electrode X filtered data LSB */ #define REG_EFDxLB(x) (0x04 + 0x02 * (x)) /* Electrode X filtered data MSB */ #define REG_EFDxHB(x) (0x05 + 0x02 * (x)) /* Proximity electrode X filtered data LSB */ #define REG_EFDPROXLB 0x1c /* Proximity electrode X filtered data MSB */ #define REG_EFDPROXHB 0x1d /* Electrode baseline value */ #define REG_ExBV(x) (0x1e + (x)) /* Proximity electrode baseline value */ #define REG_EPROXBV 0x2a /* Max Half Delta Rising */ #define REG_MHDR 0x2b /* Noise Half Delta Rising */ #define REG_NHDR 0x2c /* Noise Count Limit Rising */ #define REG_NCLR 0x2d /* Filter Delay Limit Rising */ #define REG_FDLR 0x2e /* Max Half Delta Falling */ #define REG_MHDF 0x2f /* Noise Half Delta Falling */ #define REG_NHDF 0x30 /* Noise Count Limit Falling */ #define REG_NCLF 0x31 /* Filter Delay Limit Falling */ #define REG_FDLF 0x32 /* Noise Half Delta Touched */ #define REG_NHDT 0x33 /* Noise Count Limit Touched */ #define REG_NCLT 0x34 /* Filter Delay Limit Touched */ #define REG_FDLT 0x35 /* Proximity Max Half Delta Rising */ #define REG_MHDPROXR 0x36 /* Proximity Noise Half Delta Rising */ #define REG_NHDPROXR 0x37 /* Proximity Noise Count Limit Rising */ #define REG_NCLPROXR 0x38 /* Proximity Filter Delay Limit Rising */ #define REG_FDLPROXR 0x39 /* Proximity Max Half Delta Falling */ #define REG_MHDPROXF 0x3a /* Proximity Noise Half Delta Falling */ #define REG_NHDPROXF 0x3b /* Proximity Noise Count Limit Falling */ #define REG_NCLPROXF 0x3c /* Proximity Filter Delay Limit Falling */ #define REG_FDLPROXF 0x3d /* Proximity Noise Half Delta Touched */ #define REG_NHDPROXT 0x3e /* Proximity Noise Count Limit Touched */ #define REG_NCLPROXT 0x3f /* Proximity Filter Delay Limit Touched */ #define REG_FDLPROXT 0x40 /* Eletrode Touch Threshold */ #define REG_ExTTH(x) (0x41 + 2 * (x)) /* Eletrode Release Threshold */ #define REG_ExRTH(x) (0x42 + 2 * (x)) /* Proximity Eletrode Touch Threshold */ #define REG_EPROXTTH 0x59 /* Proximity Eletrode Release Threshold */ #define REG_EPROXRTH 0x5a /* Debounce Control */ #define REG_DEBOUNCE 0x5b #define REG_DEBOUNCE__DR(dr) ((dr) << 4) #define REG_DEBOUNCE__DT(dt) (dt) /* Analog Front End Configuration */ #define REG_AFE 0x5c #define REG_AFE__CDC(cdc) (cdc) #define REG_AFE__FFI(ffi) ((ffi) << 6) /* Filter Configuration */ #define REG_FILTER 0x5d #define REG_FILTER__ESI(esi) (esi) #define REG_FILTER__SFI(sfi) ((sfi) << 3) #define REG_FILTER__CDT(cdt) ((cdt) << 5) /* Electrode Configuration */ #define REG_ELECTRODE 0x5e #define REG_ELECTRODE__ELE_EN(en) (en) #define REG_ELECTRODE__ELEPROX_EN(en) ((en) << 4) #define REG_ELECTRODE__CL(cl) ((cl) << 6) /* Electrode X Current */ #define REG_CDCx(x) (0x5f + (x)) /* Proximity Eletrode X Current */ #define REG_CDCPROX 0x6b /* Electrode X Charge Time */ #define REG_CDTx(x) (0x6c + (x) / 2) #define REG_CDTx__CDT0(x) (x) #define REG_CDTx__CDT1(x) ((x) << 4) /* Proximity Eletrode X Charge Time */ #define REG_CDTPROX 0x72 /* GPIO Control Register: CTL0{4-11} */ #define REG_GPIO_CTL0 0x73 #define REG_GPIO_CTL0__CTL0x(x) (1 << ((x) - 4)) /* GPIO Control Register: CTL1{4-11} */ #define REG_GPIO_CTL1 0x74 #define REG_GPIO_CTL1__CTL1x(x) (1 << ((x) - 4)) /* GPIO Data Register */ #define REG_GPIO_DATA 0x75 #define REG_GPIO_DATA__DATx(x) (1 << ((x) - 4)) /* GPIO Direction Register */ #define REG_GPIO_DIR 0x76 #define REG_GPIO_DIR__DIRx(x) (1 << ((x) - 4)) /* GPIO Enable Register */ #define REG_GPIO_EN 0x77 #define REG_GPIO_EN__ENx(x) (1 << ((x) - 4)) /* GPIO Data Set Register */ #define REG_GPIO_SET 0x78 #define REG_GPIO_SET__SETx(x) (1 << ((x) - 4)) /* GPIO Data Clear Register */ #define REG_GPIO_CLR 0x79 #define REG_GPIO_CLR__CLRx(x) (1 << ((x) - 4)) /* GPIO Data Toggle Register */ #define REG_GPIO_TOG 0x7a #define REG_GPIO_TOG__TOGx(x) (1 << ((x) - 4)) /* Auto-Configuration Control 0 */ #define REG_AUTO_CONF 0x7b #define REG_AUTO_CONF__ACE(ace) (ace) #define REG_AUTO_CONF__ARE(are) ((are) << 1) #define REG_AUTO_CONF__BVA(bva) ((bva) << 2) #define REG_AUTO_CONF__RETRY(retry) ((retry) << 4) #define REG_AUTO_CONF__FFI(ffi) ((ffi) << 6) /* Auto-Configuration Control 1 */ #define REG_AUTO_CONF2 0x7c #define REG_AUTO_CONF2__ACFIE(acfie) (acfie) #define REG_AUTO_CONF2__ARFIE(arfie) ((arfie) << 1) #define REG_AUTO_CONF2__OORIE(oorie) ((oorie) << 2) #define REG_AUTO_CONF2__SCTS(scts) ((scts) << 7) /* Auto-Configuration Upper-Limit */ #define REG_USL 0x7d /* Auto-Configuration Lower-Limit */ #define REG_LSL 0x7e /* Auto-Configuration Target Level */ #define REG_TL 0x7f /* Soft-Reset */ #define REG_SOFTRESET 0x80 #define REG_SOFTRESET__MAGIC 0x63 /* PWM Control */ #define REG_PWMx(x) (0x81 + ((x) - 4) / 2) #define REG_PWMx_IS_PWM0(x) (((x) % 2) == 0) #define REG_PWMx__PWM0(x) (x) #define REG_PWMx__PWM0_BM 0xf #define REG_PWMx__PWM1(x) ((x) << 4) #define REG_PWMx__PWM1_BM 0xf0 static int i2c_addr; static inline int mpr121_write_reg(uint8_t reg, uint8_t data) { return i2c_writemem(i2c_addr, reg, &data, 1); } static inline int mpr121_read_reg(uint8_t reg, uint8_t *data) { return i2c_readmem(i2c_addr, reg, data, 1); } int mpr121_init(int dev_i2c_addr) { i2c_addr = dev_i2c_addr; return 0; } int mpr121_soft_reset(void) { return mpr121_write_reg(REG_SOFTRESET, REG_SOFTRESET__MAGIC); } int mpr121_set_config(struct mpr121_config_t *conf) { int ret; #define safe_write(reg, val) \ do { ret = mpr121_write_reg(reg, val); \ if(ret) return ret; } while(0) /* stop mode */ safe_write(REG_ELECTRODE, 0); /* write baseline values */ for(int i = 0; i < ELECTRODE_COUNT; i++) safe_write(REG_ExBV(i), conf->ele[i].bv); /* write eleprox bv */ safe_write(REG_EPROXBV, conf->eleprox.bv); /* write global fields */ safe_write(REG_MHDR, conf->filters.ele.rising.mhd); safe_write(REG_NHDR, conf->filters.ele.rising.nhd); safe_write(REG_NCLR, conf->filters.ele.rising.ncl); safe_write(REG_FDLR, conf->filters.ele.rising.fdl); safe_write(REG_MHDF, conf->filters.ele.falling.mhd); safe_write(REG_NHDF, conf->filters.ele.falling.nhd); safe_write(REG_NCLF, conf->filters.ele.falling.ncl); safe_write(REG_FDLF, conf->filters.ele.falling.fdl); safe_write(REG_NHDT, conf->filters.ele.touched.nhd); safe_write(REG_NCLT, conf->filters.ele.touched.ncl); safe_write(REG_FDLT, conf->filters.ele.touched.fdl); safe_write(REG_MHDPROXR, conf->filters.eleprox.rising.mhd); safe_write(REG_NHDPROXR, conf->filters.eleprox.rising.nhd); safe_write(REG_NCLPROXR, conf->filters.eleprox.rising.ncl); safe_write(REG_FDLPROXR, conf->filters.eleprox.rising.fdl); safe_write(REG_MHDPROXF, conf->filters.eleprox.falling.mhd); safe_write(REG_NHDPROXF, conf->filters.eleprox.falling.nhd); safe_write(REG_NCLPROXF, conf->filters.eleprox.falling.ncl); safe_write(REG_FDLPROXF, conf->filters.eleprox.falling.fdl); safe_write(REG_NHDPROXT, conf->filters.eleprox.touched.nhd); safe_write(REG_NCLPROXT, conf->filters.eleprox.touched.ncl); safe_write(REG_FDLPROXT, conf->filters.eleprox.touched.fdl); /* touch & release thresholds */ for(int i = 0; i < ELECTRODE_COUNT; i++) { safe_write(REG_ExTTH(i), conf->ele[i].tth); safe_write(REG_ExRTH(i), conf->ele[i].rth); } safe_write(REG_EPROXTTH, conf->eleprox.tth); safe_write(REG_EPROXRTH, conf->eleprox.rth); /* debounce */ safe_write(REG_DEBOUNCE, REG_DEBOUNCE__DR(conf->debounce.dr) | REG_DEBOUNCE__DT(conf->debounce.dt)); /* analog-front end and filters */ safe_write(REG_AFE, REG_AFE__CDC(conf->global.cdc) | REG_AFE__FFI(conf->global.ffi)); safe_write(REG_FILTER, REG_FILTER__CDT(conf->global.cdt) | REG_FILTER__ESI(conf->global.esi) | REG_FILTER__SFI(conf->global.sfi)); /* electrode charge */ for(int i = 0; i < ELECTRODE_COUNT; i++) safe_write(REG_CDCx(i), conf->ele[i].cdc); safe_write(REG_CDCPROX, conf->eleprox.cdc); for(int i = 0; i < ELECTRODE_COUNT; i += 2) { safe_write(REG_CDTx(i), REG_CDTx__CDT0(conf->ele[i].cdt) | REG_CDTx__CDT1(conf->ele[i+1].cdt)); } safe_write(REG_CDTPROX, conf->eleprox.cdt); /* Auto-Configuration */ safe_write(REG_AUTO_CONF, REG_AUTO_CONF__ACE(conf->autoconf.en) | REG_AUTO_CONF__ARE(conf->autoconf.ren) | REG_AUTO_CONF__BVA(conf->cal_lock) | REG_AUTO_CONF__RETRY(conf->autoconf.retry) | REG_AUTO_CONF__FFI(conf->global.ffi)); safe_write(REG_AUTO_CONF2, REG_AUTO_CONF2__ACFIE(conf->autoconf.acfie) | REG_AUTO_CONF2__ARFIE(conf->autoconf.arfie) | REG_AUTO_CONF2__OORIE(conf->autoconf.oorie) | REG_AUTO_CONF2__SCTS(conf->autoconf.scts)); safe_write(REG_USL, conf->autoconf.usl); safe_write(REG_LSL, conf->autoconf.lsl); safe_write(REG_TL, conf->autoconf.tl); /* electrode configuration */ safe_write(REG_ELECTRODE, REG_ELECTRODE__ELE_EN(conf->ele_en) | REG_ELECTRODE__ELEPROX_EN(conf->eleprox_en) | REG_ELECTRODE__CL(conf->cal_lock)); /* gpio config */ uint8_t ctl = 0; for(int i = ELE_GPIO_FIRST; i <= ELE_GPIO_LAST; i++) if(ELE_GPIO_CTL0(conf->ele[i].gpio)) ctl |= REG_GPIO_CTL0__CTL0x(i); safe_write(REG_GPIO_CTL0, ctl); ctl = 0; for(int i = ELE_GPIO_FIRST; i <= ELE_GPIO_LAST; i++) if(ELE_GPIO_CTL1(conf->ele[i].gpio)) ctl |= REG_GPIO_CTL1__CTL1x(i); safe_write(REG_GPIO_CTL1, ctl); ctl = 0; for(int i = ELE_GPIO_FIRST; i <= ELE_GPIO_LAST; i++) if(ELE_GPIO_DIR(conf->ele[i].gpio)) ctl |= REG_GPIO_DIR__DIRx(i); safe_write(REG_GPIO_DIR, ctl); ctl = 0; for(int i = ELE_GPIO_FIRST; i <= ELE_GPIO_LAST; i++) if(ELE_GPIO_EN(conf->ele[i].gpio)) ctl |= REG_GPIO_EN__ENx(i); safe_write(REG_GPIO_EN, ctl); return 0; } int mpr121_set_gpio_output(int ele, int gpio_val) { switch(gpio_val) { case ELE_GPIO_SET: return mpr121_write_reg(REG_GPIO_SET, REG_GPIO_SET__SETx(ele)); case ELE_GPIO_CLR: return mpr121_write_reg(REG_GPIO_CLR, REG_GPIO_CLR__CLRx(ele)); case ELE_GPIO_TOG: return mpr121_write_reg(REG_GPIO_TOG, REG_GPIO_TOG__TOGx(ele)); default: return -1; } } int mpr121_set_gpio_pwm(int ele, int pwm) { uint8_t reg_val; int ret = mpr121_read_reg(REG_PWMx(ele), ®_val); if(ret) return ret; if(REG_PWMx_IS_PWM0(ele)) reg_val = (reg_val & ~REG_PWMx__PWM0_BM) | REG_PWMx__PWM0(pwm); else reg_val = (reg_val & ~REG_PWMx__PWM1_BM) | REG_PWMx__PWM1(pwm); return mpr121_write_reg(REG_PWMx(ele), reg_val); } int mpr121_get_touch_status(unsigned *status) { uint8_t buf[2]; int ret = i2c_readmem(i2c_addr, REG_TOUCH_STATUS, buf, 2); if(!ret && status) *status = buf[0] | buf[1]; return ret; }