1248557Sray/*- 2248557Sray * Copyright (C) 2008-2009 Semihalf, Michal Hajduk 3250357Sray * Copyright (c) 2012, 2013 The FreeBSD Foundation 4289666Sian * Copyright (c) 2015 Ian Lepore <ian@FreeBSD.org> 5248557Sray * All rights reserved. 6248557Sray * 7248557Sray * Portions of this software were developed by Oleksandr Rybalko 8248557Sray * under sponsorship from the FreeBSD Foundation. 9248557Sray * 10248557Sray * Redistribution and use in source and binary forms, with or without 11248557Sray * modification, are permitted provided that the following conditions 12248557Sray * are met: 13248557Sray * 1. Redistributions of source code must retain the above copyright 14248557Sray * notice, this list of conditions and the following disclaimer. 15248557Sray * 2. Redistributions in binary form must reproduce the above copyright 16248557Sray * notice, this list of conditions and the following disclaimer in the 17248557Sray * documentation and/or other materials provided with the distribution. 18248557Sray * 19248557Sray * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND 20248557Sray * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21248557Sray * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22248557Sray * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE 23248557Sray * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24248557Sray * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25248557Sray * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26248557Sray * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27248557Sray * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28248557Sray * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29248557Sray * SUCH DAMAGE. 30248557Sray */ 31248557Sray 32289666Sian/* 33289666Sian * I2C driver for Freescale i.MX hardware. 34289666Sian * 35289666Sian * Note that the hardware is capable of running as both a master and a slave. 36289666Sian * This driver currently implements only master-mode operations. 37289666Sian * 38289666Sian * This driver supports multi-master i2c busses, by detecting bus arbitration 39289666Sian * loss and returning IIC_EBUSBSY status. Notably, it does not do any kind of 40289666Sian * retries if some other master jumps onto the bus and interrupts one of our 41289666Sian * transfer cycles resulting in arbitration loss in mid-transfer. The caller 42289666Sian * must handle retries in a way that makes sense for the slave being addressed. 43289666Sian */ 44289666Sian 45248557Sray#include <sys/cdefs.h> 46248557Sray__FBSDID("$FreeBSD: releng/10.3/sys/arm/freescale/imx/imx_i2c.c 289666 2015-10-20 21:20:34Z ian $"); 47248557Sray 48248557Sray#include <sys/param.h> 49248557Sray#include <sys/systm.h> 50248557Sray#include <sys/bus.h> 51248557Sray#include <sys/kernel.h> 52276278Sian#include <sys/limits.h> 53248557Sray#include <sys/module.h> 54248557Sray#include <sys/resource.h> 55248557Sray 56248557Sray#include <machine/bus.h> 57248557Sray#include <machine/resource.h> 58248557Sray#include <sys/rman.h> 59248557Sray 60276278Sian#include <arm/freescale/imx/imx_ccmvar.h> 61276278Sian 62248557Sray#include <dev/iicbus/iiconf.h> 63248557Sray#include <dev/iicbus/iicbus.h> 64248557Sray#include "iicbus_if.h" 65248557Sray 66248557Sray#include <dev/fdt/fdt_common.h> 67248557Sray#include <dev/ofw/openfirm.h> 68248557Sray#include <dev/ofw/ofw_bus.h> 69248557Sray#include <dev/ofw/ofw_bus_subr.h> 70248557Sray 71248557Sray#define I2C_ADDR_REG 0x00 /* I2C slave address register */ 72248557Sray#define I2C_FDR_REG 0x04 /* I2C frequency divider register */ 73248557Sray#define I2C_CONTROL_REG 0x08 /* I2C control register */ 74248557Sray#define I2C_STATUS_REG 0x0C /* I2C status register */ 75248557Sray#define I2C_DATA_REG 0x10 /* I2C data register */ 76248557Sray#define I2C_DFSRR_REG 0x14 /* I2C Digital Filter Sampling rate */ 77248557Sray 78248557Sray#define I2CCR_MEN (1 << 7) /* Module enable */ 79248557Sray#define I2CCR_MSTA (1 << 5) /* Master/slave mode */ 80248557Sray#define I2CCR_MTX (1 << 4) /* Transmit/receive mode */ 81248557Sray#define I2CCR_TXAK (1 << 3) /* Transfer acknowledge */ 82248557Sray#define I2CCR_RSTA (1 << 2) /* Repeated START */ 83248557Sray 84248557Sray#define I2CSR_MCF (1 << 7) /* Data transfer */ 85248557Sray#define I2CSR_MASS (1 << 6) /* Addressed as a slave */ 86248557Sray#define I2CSR_MBB (1 << 5) /* Bus busy */ 87248557Sray#define I2CSR_MAL (1 << 4) /* Arbitration lost */ 88248557Sray#define I2CSR_SRW (1 << 2) /* Slave read/write */ 89248557Sray#define I2CSR_MIF (1 << 1) /* Module interrupt */ 90248557Sray#define I2CSR_RXAK (1 << 0) /* Received acknowledge */ 91248557Sray 92248557Sray#define I2C_BAUD_RATE_FAST 0x31 93248557Sray#define I2C_BAUD_RATE_DEF 0x3F 94248557Sray#define I2C_DFSSR_DIV 0x10 95248557Sray 96276278Sian/* 97276278Sian * A table of available divisors and the associated coded values to put in the 98276278Sian * FDR register to achieve that divisor.. There is no algorithmic relationship I 99276278Sian * can see between divisors and the codes that go into the register. The table 100276278Sian * begins and ends with entries that handle insane configuration values. 101276278Sian */ 102276278Sianstruct clkdiv { 103276278Sian u_int divisor; 104276278Sian u_int regcode; 105276278Sian}; 106276278Sianstatic struct clkdiv clkdiv_table[] = { 107276278Sian { 0, 0x20 }, { 22, 0x20 }, { 24, 0x21 }, { 26, 0x22 }, 108276278Sian { 28, 0x23 }, { 30, 0x00 }, { 32, 0x24 }, { 36, 0x25 }, 109276278Sian { 40, 0x26 }, { 42, 0x03 }, { 44, 0x27 }, { 48, 0x28 }, 110276278Sian { 52, 0x05 }, { 56, 0x29 }, { 60, 0x06 }, { 64, 0x2a }, 111276278Sian { 72, 0x2b }, { 80, 0x2c }, { 88, 0x09 }, { 96, 0x2d }, 112276278Sian { 104, 0x0a }, { 112, 0x2e }, { 128, 0x2f }, { 144, 0x0c }, 113276278Sian { 160, 0x30 }, { 192, 0x31 }, { 224, 0x32 }, { 240, 0x0f }, 114276278Sian { 256, 0x33 }, { 288, 0x10 }, { 320, 0x34 }, { 384, 0x35 }, 115276278Sian { 448, 0x36 }, { 480, 0x13 }, { 512, 0x37 }, { 576, 0x14 }, 116276278Sian { 640, 0x38 }, { 768, 0x39 }, { 896, 0x3a }, { 960, 0x17 }, 117276278Sian { 1024, 0x3b }, { 1152, 0x18 }, { 1280, 0x3c }, { 1536, 0x3d }, 118276278Sian { 1792, 0x3e }, { 1920, 0x1b }, { 2048, 0x3f }, { 2304, 0x1c }, 119276278Sian { 2560, 0x1d }, { 3072, 0x1e }, { 3840, 0x1f }, {UINT_MAX, 0x1f} 120276278Sian}; 121276278Sian 122273662Sianstatic struct ofw_compat_data compat_data[] = { 123273662Sian {"fsl,imx6q-i2c", 1}, 124273662Sian {"fsl,imx-i2c", 1}, 125273662Sian {NULL, 0} 126273662Sian}; 127273662Sian 128248557Sraystruct i2c_softc { 129248557Sray device_t dev; 130248557Sray device_t iicbus; 131248557Sray struct resource *res; 132248557Sray int rid; 133289666Sian sbintime_t byte_time_sbt; 134248557Sray}; 135248557Sray 136248557Sraystatic phandle_t i2c_get_node(device_t, device_t); 137248557Sraystatic int i2c_probe(device_t); 138248557Sraystatic int i2c_attach(device_t); 139248557Sray 140248557Sraystatic int i2c_repeated_start(device_t, u_char, int); 141248557Sraystatic int i2c_start(device_t, u_char, int); 142248557Sraystatic int i2c_stop(device_t); 143248557Sraystatic int i2c_reset(device_t, u_char, u_char, u_char *); 144248557Sraystatic int i2c_read(device_t, char *, int, int *, int, int); 145248557Sraystatic int i2c_write(device_t, const char *, int, int *, int); 146248557Sray 147248557Sraystatic device_method_t i2c_methods[] = { 148248557Sray DEVMETHOD(device_probe, i2c_probe), 149248557Sray DEVMETHOD(device_attach, i2c_attach), 150248557Sray 151248557Sray /* OFW methods */ 152248557Sray DEVMETHOD(ofw_bus_get_node, i2c_get_node), 153248557Sray 154248557Sray DEVMETHOD(iicbus_callback, iicbus_null_callback), 155248557Sray DEVMETHOD(iicbus_repeated_start, i2c_repeated_start), 156248557Sray DEVMETHOD(iicbus_start, i2c_start), 157248557Sray DEVMETHOD(iicbus_stop, i2c_stop), 158248557Sray DEVMETHOD(iicbus_reset, i2c_reset), 159248557Sray DEVMETHOD(iicbus_read, i2c_read), 160248557Sray DEVMETHOD(iicbus_write, i2c_write), 161248557Sray DEVMETHOD(iicbus_transfer, iicbus_transfer_gen), 162248557Sray 163289666Sian DEVMETHOD_END 164248557Sray}; 165248557Sray 166248557Sraystatic driver_t i2c_driver = { 167248557Sray "iichb", 168248557Sray i2c_methods, 169248557Sray sizeof(struct i2c_softc), 170248557Sray}; 171248557Sraystatic devclass_t i2c_devclass; 172248557Sray 173248557SrayDRIVER_MODULE(i2c, simplebus, i2c_driver, i2c_devclass, 0, 0); 174248557SrayDRIVER_MODULE(iicbus, i2c, iicbus_driver, iicbus_devclass, 0, 0); 175248557Sray 176248557Sraystatic phandle_t 177248557Srayi2c_get_node(device_t bus, device_t dev) 178248557Sray{ 179248557Sray /* 180248557Sray * Share controller node with iicbus device 181248557Sray */ 182248557Sray return ofw_bus_get_node(bus); 183248557Sray} 184248557Sray 185248557Sraystatic __inline void 186248557Srayi2c_write_reg(struct i2c_softc *sc, bus_size_t off, uint8_t val) 187248557Sray{ 188248557Sray 189289666Sian bus_write_1(sc->res, off, val); 190248557Sray} 191248557Sray 192248557Sraystatic __inline uint8_t 193248557Srayi2c_read_reg(struct i2c_softc *sc, bus_size_t off) 194248557Sray{ 195248557Sray 196289666Sian return (bus_read_1(sc->res, off)); 197248557Sray} 198248557Sray 199248557Sraystatic __inline void 200248557Srayi2c_flag_set(struct i2c_softc *sc, bus_size_t off, uint8_t mask) 201248557Sray{ 202248557Sray uint8_t status; 203248557Sray 204248557Sray status = i2c_read_reg(sc, off); 205248557Sray status |= mask; 206248557Sray i2c_write_reg(sc, off, status); 207248557Sray} 208248557Sray 209289666Sian/* Wait for bus to become busy or not-busy. */ 210248557Sraystatic int 211289666Sianwait_for_busbusy(struct i2c_softc *sc, int wantbusy) 212248557Sray{ 213289666Sian int retry, srb; 214248557Sray 215248557Sray retry = 1000; 216248557Sray while (retry --) { 217289666Sian srb = i2c_read_reg(sc, I2C_STATUS_REG) & I2CSR_MBB; 218289666Sian if ((srb && wantbusy) || (!srb && !wantbusy)) 219248557Sray return (IIC_NOERR); 220289666Sian DELAY(1); 221248557Sray } 222248557Sray return (IIC_ETIMEOUT); 223248557Sray} 224248557Sray 225289666Sian/* Wait for transfer to complete, optionally check RXAK. */ 226248557Sraystatic int 227289666Sianwait_for_xfer(struct i2c_softc *sc, int checkack) 228248557Sray{ 229289666Sian int retry, sr; 230248557Sray 231289666Sian /* 232289666Sian * Sleep for about the time it takes to transfer a byte (with precision 233289666Sian * set to tolerate 5% oversleep). We calculate the approximate byte 234289666Sian * transfer time when we set the bus speed divisor. Slaves are allowed 235289666Sian * to do clock-stretching so the actual transfer time can be larger, but 236289666Sian * this gets the bulk of the waiting out of the way without tying up the 237289666Sian * processor the whole time. 238289666Sian */ 239289666Sian pause_sbt("imxi2c", sc->byte_time_sbt, sc->byte_time_sbt / 20, 0); 240289666Sian 241289666Sian retry = 10000; 242248557Sray while (retry --) { 243289666Sian sr = i2c_read_reg(sc, I2C_STATUS_REG); 244289666Sian if (sr & I2CSR_MIF) { 245289666Sian if (sr & I2CSR_MAL) 246289666Sian return (IIC_EBUSERR); 247289666Sian else if (checkack && (sr & I2CSR_RXAK)) 248289666Sian return (IIC_ENOACK); 249289666Sian else 250289666Sian return (IIC_NOERR); 251289666Sian } 252289666Sian DELAY(1); 253248557Sray } 254248557Sray return (IIC_ETIMEOUT); 255248557Sray} 256248557Sray 257289666Sian/* 258289666Sian * Implement the error handling shown in the state diagram of the imx6 reference 259289666Sian * manual. If there was an error, then: 260289666Sian * - Clear master mode (MSTA and MTX). 261289666Sian * - Wait for the bus to become free or for a timeout to happen. 262289666Sian * - Disable the controller. 263289666Sian */ 264248557Sraystatic int 265289666Siani2c_error_handler(struct i2c_softc *sc, int error) 266248557Sray{ 267248557Sray 268289666Sian if (error != 0) { 269289666Sian i2c_write_reg(sc, I2C_STATUS_REG, 0); 270289666Sian i2c_write_reg(sc, I2C_CONTROL_REG, I2CCR_MEN); 271289666Sian wait_for_busbusy(sc, false); 272289666Sian i2c_write_reg(sc, I2C_CONTROL_REG, 0); 273248557Sray } 274289666Sian return (error); 275248557Sray} 276248557Sray 277248557Sraystatic int 278248557Srayi2c_probe(device_t dev) 279248557Sray{ 280248557Sray 281261410Sian if (!ofw_bus_status_okay(dev)) 282261410Sian return (ENXIO); 283261410Sian 284273662Sian if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0) 285248557Sray return (ENXIO); 286248557Sray 287289666Sian device_set_desc(dev, "Freescale i.MX I2C"); 288248557Sray 289248557Sray return (BUS_PROBE_DEFAULT); 290248557Sray} 291248557Sray 292248557Sraystatic int 293248557Srayi2c_attach(device_t dev) 294248557Sray{ 295248557Sray struct i2c_softc *sc; 296248557Sray 297248557Sray sc = device_get_softc(dev); 298248557Sray sc->dev = dev; 299248557Sray sc->rid = 0; 300248557Sray 301248557Sray sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &sc->rid, 302248557Sray RF_ACTIVE); 303248557Sray if (sc->res == NULL) { 304248557Sray device_printf(dev, "could not allocate resources"); 305248557Sray return (ENXIO); 306248557Sray } 307248557Sray 308248557Sray sc->iicbus = device_add_child(dev, "iicbus", -1); 309248557Sray if (sc->iicbus == NULL) { 310248557Sray device_printf(dev, "could not add iicbus child"); 311248557Sray return (ENXIO); 312248557Sray } 313248557Sray 314248557Sray bus_generic_attach(dev); 315289666Sian return (0); 316248557Sray} 317248557Sray 318248557Sraystatic int 319248557Srayi2c_repeated_start(device_t dev, u_char slave, int timeout) 320248557Sray{ 321248557Sray struct i2c_softc *sc; 322248557Sray int error; 323248557Sray 324248557Sray sc = device_get_softc(dev); 325248557Sray 326248557Sray if ((i2c_read_reg(sc, I2C_STATUS_REG) & I2CSR_MBB) == 0) { 327289666Sian return (IIC_EBUSERR); 328248557Sray } 329248557Sray 330289666Sian /* 331289666Sian * Set repeated start condition, delay (per reference manual, min 156nS) 332289666Sian * before writing slave address, wait for ack after write. 333289666Sian */ 334248557Sray i2c_flag_set(sc, I2C_CONTROL_REG, I2CCR_RSTA); 335289666Sian DELAY(1); 336248557Sray i2c_write_reg(sc, I2C_STATUS_REG, 0x0); 337248557Sray i2c_write_reg(sc, I2C_DATA_REG, slave); 338289666Sian error = wait_for_xfer(sc, true); 339289666Sian return (i2c_error_handler(sc, error)); 340248557Sray} 341248557Sray 342248557Sraystatic int 343248557Srayi2c_start(device_t dev, u_char slave, int timeout) 344248557Sray{ 345248557Sray struct i2c_softc *sc; 346248557Sray int error; 347248557Sray 348248557Sray sc = device_get_softc(dev); 349248557Sray 350289666Sian i2c_write_reg(sc, I2C_CONTROL_REG, I2CCR_MEN); 351289666Sian DELAY(10); /* Delay for controller to sample bus state. */ 352248557Sray if (i2c_read_reg(sc, I2C_STATUS_REG) & I2CSR_MBB) { 353289666Sian return (i2c_error_handler(sc, IIC_EBUSERR)); 354248557Sray } 355289666Sian i2c_write_reg(sc, I2C_CONTROL_REG, I2CCR_MEN | I2CCR_MSTA | I2CCR_MTX); 356289666Sian if ((error = wait_for_busbusy(sc, true)) != IIC_NOERR) 357289666Sian return (i2c_error_handler(sc, error)); 358289666Sian i2c_write_reg(sc, I2C_STATUS_REG, 0); 359248557Sray i2c_write_reg(sc, I2C_DATA_REG, slave); 360289666Sian error = wait_for_xfer(sc, true); 361289666Sian return (i2c_error_handler(sc, error)); 362248557Sray} 363248557Sray 364248557Sraystatic int 365248557Srayi2c_stop(device_t dev) 366248557Sray{ 367248557Sray struct i2c_softc *sc; 368248557Sray 369248557Sray sc = device_get_softc(dev); 370248557Sray 371289666Sian i2c_write_reg(sc, I2C_CONTROL_REG, I2CCR_MEN); 372289666Sian wait_for_busbusy(sc, false); 373289666Sian i2c_write_reg(sc, I2C_CONTROL_REG, 0); 374248557Sray return (IIC_NOERR); 375248557Sray} 376248557Sray 377248557Sraystatic int 378248557Srayi2c_reset(device_t dev, u_char speed, u_char addr, u_char *oldadr) 379248557Sray{ 380248557Sray struct i2c_softc *sc; 381276278Sian u_int busfreq, div, i, ipgfreq; 382248557Sray 383248557Sray sc = device_get_softc(dev); 384248557Sray 385276278Sian /* 386276278Sian * Look up the divisor that gives the nearest speed that doesn't exceed 387276278Sian * the configured value for the bus. 388276278Sian */ 389276278Sian ipgfreq = imx_ccm_ipg_hz(); 390276278Sian busfreq = IICBUS_GET_FREQUENCY(sc->iicbus, speed); 391276278Sian div = (ipgfreq + busfreq - 1) / busfreq; 392276278Sian for (i = 0; i < nitems(clkdiv_table); i++) { 393276278Sian if (clkdiv_table[i].divisor >= div) 394276278Sian break; 395248557Sray } 396248557Sray 397289666Sian /* 398289666Sian * Calculate roughly how long it will take to transfer a byte (which 399289666Sian * requires 9 clock cycles) at the new bus speed. This value is used to 400289666Sian * pause() while waiting for transfer-complete. With a 66MHz IPG clock 401289666Sian * and the actual i2c bus speeds that leads to, for nominal 100KHz and 402289666Sian * 400KHz bus speeds the transfer times are roughly 104uS and 22uS. 403289666Sian */ 404289666Sian busfreq = ipgfreq / clkdiv_table[i].divisor; 405289666Sian sc->byte_time_sbt = SBT_1US * (9000000 / busfreq); 406248557Sray 407289666Sian /* 408289666Sian * Disable the controller (do the reset), and set the new clock divisor. 409289666Sian */ 410248557Sray i2c_write_reg(sc, I2C_STATUS_REG, 0x0); 411289666Sian i2c_write_reg(sc, I2C_CONTROL_REG, 0x0); 412289666Sian i2c_write_reg(sc, I2C_FDR_REG, (uint8_t)clkdiv_table[i].regcode); 413248557Sray return (IIC_NOERR); 414248557Sray} 415248557Sray 416248557Sraystatic int 417248557Srayi2c_read(device_t dev, char *buf, int len, int *read, int last, int delay) 418248557Sray{ 419248557Sray struct i2c_softc *sc; 420248557Sray int error, reg; 421248557Sray 422248557Sray sc = device_get_softc(dev); 423248557Sray *read = 0; 424248557Sray 425248557Sray if (len) { 426248557Sray if (len == 1) 427248557Sray i2c_write_reg(sc, I2C_CONTROL_REG, I2CCR_MEN | 428248557Sray I2CCR_MSTA | I2CCR_TXAK); 429248557Sray else 430248557Sray i2c_write_reg(sc, I2C_CONTROL_REG, I2CCR_MEN | 431248557Sray I2CCR_MSTA); 432289666Sian /* Dummy read to prime the receiver. */ 433289666Sian i2c_write_reg(sc, I2C_STATUS_REG, 0x0); 434248557Sray i2c_read_reg(sc, I2C_DATA_REG); 435248557Sray } 436248557Sray 437289666Sian error = 0; 438289666Sian *read = 0; 439248557Sray while (*read < len) { 440289666Sian if ((error = wait_for_xfer(sc, false)) != IIC_NOERR) 441289666Sian break; 442248557Sray i2c_write_reg(sc, I2C_STATUS_REG, 0x0); 443289666Sian if (last) { 444289666Sian if (*read == len - 2) { 445289666Sian /* NO ACK on last byte */ 446289666Sian i2c_write_reg(sc, I2C_CONTROL_REG, I2CCR_MEN | 447289666Sian I2CCR_MSTA | I2CCR_TXAK); 448289666Sian } else if (*read == len - 1) { 449289666Sian /* Transfer done, signal stop. */ 450289666Sian i2c_write_reg(sc, I2C_CONTROL_REG, I2CCR_MEN | 451289666Sian I2CCR_TXAK); 452289666Sian wait_for_busbusy(sc, false); 453289666Sian } 454248557Sray } 455248557Sray reg = i2c_read_reg(sc, I2C_DATA_REG); 456248557Sray *buf++ = reg; 457248557Sray (*read)++; 458248557Sray } 459248557Sray 460289666Sian return (i2c_error_handler(sc, error)); 461248557Sray} 462248557Sray 463248557Sraystatic int 464248557Srayi2c_write(device_t dev, const char *buf, int len, int *sent, int timeout) 465248557Sray{ 466248557Sray struct i2c_softc *sc; 467248557Sray int error; 468248557Sray 469248557Sray sc = device_get_softc(dev); 470289666Sian 471289666Sian error = 0; 472248557Sray *sent = 0; 473248557Sray while (*sent < len) { 474248557Sray i2c_write_reg(sc, I2C_STATUS_REG, 0x0); 475248557Sray i2c_write_reg(sc, I2C_DATA_REG, *buf++); 476289666Sian if ((error = wait_for_xfer(sc, true)) != IIC_NOERR) 477289666Sian break; 478248557Sray (*sent)++; 479248557Sray } 480248557Sray 481289666Sian return (i2c_error_handler(sc, error)); 482248557Sray} 483