| /* |
| * Copyright 2012 Luis R. Rodriguez <mcgrof@frijolero.org> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| * |
| * Compatibility file for Linux wireless for kernels 3.4. |
| */ |
| |
| #include <linux/fs.h> |
| #include <linux/module.h> |
| #include <linux/wait.h> |
| |
| #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,2,0)) |
| #include <linux/regmap.h> |
| #include <linux/i2c.h> |
| #include <linux/spi/spi.h> |
| #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,3,0)) |
| #if (LINUX_VERSION_CODE < KERNEL_VERSION(3,4,0)) |
| #if defined(CPTCFG_VIDEO_DEV_MODULE) |
| #include <media/soc_camera.h> |
| #include <media/v4l2-common.h> |
| #include <media/v4l2-ioctl.h> |
| #include <media/v4l2-dev.h> |
| #include <media/videobuf-core.h> |
| #include <media/videobuf2-core.h> |
| #include <media/soc_mediabus.h> |
| #include <linux/regulator/consumer.h> |
| #endif /* defined(CPTCFG_VIDEO_DEV_MODULE) */ |
| #endif /* (LINUX_VERSION_CODE < KERNEL_VERSION(3,4,0)) */ |
| #endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,3,0)) */ |
| #endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,2,0)) */ |
| |
| #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,2,0)) |
| |
| #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,3,0)) |
| #if (LINUX_VERSION_CODE < KERNEL_VERSION(3,4,0)) |
| |
| #if defined(CPTCFG_VIDEO_V4L2_MODULE) |
| int soc_camera_power_on(struct device *dev, |
| struct soc_camera_subdev_desc *ssdd) |
| { |
| int ret = regulator_bulk_enable(ssdd->num_regulators, |
| ssdd->regulators); |
| if (ret < 0) { |
| dev_err(dev, "Cannot enable regulators\n"); |
| return ret; |
| } |
| |
| if (ssdd->power) { |
| ret = ssdd->power(dev, 1); |
| if (ret < 0) { |
| dev_err(dev, |
| "Platform failed to power-on the camera.\n"); |
| regulator_bulk_disable(ssdd->num_regulators, |
| ssdd->regulators); |
| } |
| } |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(soc_camera_power_on); |
| |
| int soc_camera_power_off(struct device *dev, |
| struct soc_camera_subdev_desc *ssdd) |
| { |
| int ret = 0; |
| int err; |
| |
| if (ssdd->power) { |
| err = ssdd->power(dev, 0); |
| if (err < 0) { |
| dev_err(dev, |
| "Platform failed to power-off the camera.\n"); |
| ret = err; |
| } |
| } |
| |
| err = regulator_bulk_disable(ssdd->num_regulators, |
| ssdd->regulators); |
| if (err < 0) { |
| dev_err(dev, "Cannot disable regulators\n"); |
| ret = ret ? : err; |
| } |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(soc_camera_power_off); |
| #endif /* defined(CPTCFG_VIDEO_V4L2_MODULE) */ |
| |
| #endif /* (LINUX_VERSION_CODE < KERNEL_VERSION(3,4,0)) */ |
| #endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,3,0)) */ |
| |
| #if defined(CONFIG_REGMAP) |
| static void devm_regmap_release(struct device *dev, void *res) |
| { |
| regmap_exit(*(struct regmap **)res); |
| } |
| |
| #if defined(CONFIG_REGMAP_I2C) |
| static int regmap_i2c_write( |
| struct device *dev, |
| const void *data, |
| size_t count) |
| { |
| struct i2c_client *i2c = to_i2c_client(dev); |
| int ret; |
| |
| ret = i2c_master_send(i2c, data, count); |
| if (ret == count) |
| return 0; |
| else if (ret < 0) |
| return ret; |
| else |
| return -EIO; |
| } |
| |
| static int regmap_i2c_gather_write( |
| struct device *dev, |
| const void *reg, size_t reg_size, |
| const void *val, size_t val_size) |
| { |
| struct i2c_client *i2c = to_i2c_client(dev); |
| struct i2c_msg xfer[2]; |
| int ret; |
| |
| /* If the I2C controller can't do a gather tell the core, it |
| * will substitute in a linear write for us. |
| */ |
| if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_NOSTART)) |
| return -ENOTSUPP; |
| |
| xfer[0].addr = i2c->addr; |
| xfer[0].flags = 0; |
| xfer[0].len = reg_size; |
| xfer[0].buf = (void *)reg; |
| |
| xfer[1].addr = i2c->addr; |
| xfer[1].flags = I2C_M_NOSTART; |
| xfer[1].len = val_size; |
| xfer[1].buf = (void *)val; |
| |
| ret = i2c_transfer(i2c->adapter, xfer, 2); |
| if (ret == 2) |
| return 0; |
| if (ret < 0) |
| return ret; |
| else |
| return -EIO; |
| } |
| |
| static int regmap_i2c_read( |
| struct device *dev, |
| const void *reg, size_t reg_size, |
| void *val, size_t val_size) |
| { |
| struct i2c_client *i2c = to_i2c_client(dev); |
| struct i2c_msg xfer[2]; |
| int ret; |
| |
| xfer[0].addr = i2c->addr; |
| xfer[0].flags = 0; |
| xfer[0].len = reg_size; |
| xfer[0].buf = (void *)reg; |
| |
| xfer[1].addr = i2c->addr; |
| xfer[1].flags = I2C_M_RD; |
| xfer[1].len = val_size; |
| xfer[1].buf = val; |
| |
| ret = i2c_transfer(i2c->adapter, xfer, 2); |
| if (ret == 2) |
| return 0; |
| else if (ret < 0) |
| return ret; |
| else |
| return -EIO; |
| } |
| |
| static struct regmap_bus regmap_i2c = { |
| .write = regmap_i2c_write, |
| .gather_write = regmap_i2c_gather_write, |
| .read = regmap_i2c_read, |
| }; |
| #endif /* defined(CONFIG_REGMAP_I2C) */ |
| |
| /** |
| * devm_regmap_init(): Initialise managed register map |
| * |
| * @dev: Device that will be interacted with |
| * @bus: Bus-specific callbacks to use with device |
| * @bus_context: Data passed to bus-specific callbacks |
| * @config: Configuration for register map |
| * |
| * The return value will be an ERR_PTR() on error or a valid pointer |
| * to a struct regmap. This function should generally not be called |
| * directly, it should be called by bus-specific init functions. The |
| * map will be automatically freed by the device management code. |
| */ |
| struct regmap *devm_regmap_init(struct device *dev, |
| const struct regmap_bus *bus, |
| const struct regmap_config *config) |
| { |
| struct regmap **ptr, *regmap; |
| |
| ptr = devres_alloc(devm_regmap_release, sizeof(*ptr), GFP_KERNEL); |
| if (!ptr) |
| return ERR_PTR(-ENOMEM); |
| |
| regmap = regmap_init(dev, |
| bus, |
| config); |
| if (!IS_ERR(regmap)) { |
| *ptr = regmap; |
| devres_add(dev, ptr); |
| } else { |
| devres_free(ptr); |
| } |
| |
| return regmap; |
| } |
| EXPORT_SYMBOL_GPL(devm_regmap_init); |
| |
| #if defined(CONFIG_REGMAP_I2C) |
| /** |
| * devm_regmap_init_i2c(): Initialise managed register map |
| * |
| * @i2c: Device that will be interacted with |
| * @config: Configuration for register map |
| * |
| * The return value will be an ERR_PTR() on error or a valid pointer |
| * to a struct regmap. The regmap will be automatically freed by the |
| * device management code. |
| */ |
| struct regmap *devm_regmap_init_i2c(struct i2c_client *i2c, |
| const struct regmap_config *config) |
| { |
| return devm_regmap_init(&i2c->dev, ®map_i2c, config); |
| } |
| EXPORT_SYMBOL_GPL(devm_regmap_init_i2c); |
| #endif /* defined(CONFIG_REGMAP_I2C) */ |
| |
| #if defined(CONFIG_REGMAP_SPI) |
| static int regmap_spi_write( |
| struct device *dev, |
| const void *data, size_t count) |
| { |
| struct spi_device *spi = to_spi_device(dev); |
| |
| return spi_write(spi, data, count); |
| } |
| |
| static int regmap_spi_gather_write( |
| struct device *dev, |
| const void *reg, size_t reg_len, |
| const void *val, size_t val_len) |
| { |
| struct spi_device *spi = to_spi_device(dev); |
| struct spi_message m; |
| struct spi_transfer t[2] = { { .tx_buf = reg, .len = reg_len, }, |
| { .tx_buf = val, .len = val_len, }, }; |
| |
| spi_message_init(&m); |
| spi_message_add_tail(&t[0], &m); |
| spi_message_add_tail(&t[1], &m); |
| |
| return spi_sync(spi, &m); |
| } |
| |
| static int regmap_spi_read( |
| struct device *dev, |
| const void *reg, size_t reg_size, |
| void *val, size_t val_size) |
| { |
| struct spi_device *spi = to_spi_device(dev); |
| |
| return spi_write_then_read(spi, reg, reg_size, val, val_size); |
| } |
| |
| static struct regmap_bus regmap_spi = { |
| .write = regmap_spi_write, |
| .gather_write = regmap_spi_gather_write, |
| /* |
| * See commit 0d509f2b112b |
| * only 3.9 kernels have this we'll ignore it |
| * given I have not seen drivers use these we |
| * are backporting. We'll -EINVAL these. |
| */ |
| #if 0 |
| .async_write = regmap_spi_async_write, |
| .async_alloc = regmap_spi_async_alloc, |
| #endif |
| .read = regmap_spi_read, |
| .read_flag_mask = 0x80, |
| |
| }; |
| |
| /** |
| * devm_regmap_init_spi(): Initialise register map |
| * |
| * @spi: Device that will be interacted with |
| * @config: Configuration for register map |
| * |
| * The return value will be an ERR_PTR() on error or a valid pointer |
| * to a struct regmap. The map will be automatically freed by the |
| * device management code. |
| */ |
| struct regmap *devm_regmap_init_spi(struct spi_device *spi, |
| const struct regmap_config *config) |
| { |
| return devm_regmap_init(&spi->dev, ®map_spi, config); |
| } |
| EXPORT_SYMBOL_GPL(devm_regmap_init_spi); |
| #endif /* defined(CONFIG_REGMAP_SPI) */ |
| |
| #endif /* defined(CONFIG_REGMAP) */ |
| #endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,2,0)) */ |
| |
| /* __wake_up_common was declared as part of the wait.h until |
| * 2.6.31 in which they made it private to the scheduler. Prefix it with |
| * compat to avoid double declaration issues. |
| */ |
| static void compat_wake_up_common(wait_queue_head_t *q, unsigned int mode, |
| int nr_exclusive, int wake_flags, void *key) |
| { |
| wait_queue_t *curr, *next; |
| |
| list_for_each_entry_safe(curr, next, &q->task_list, task_list) { |
| unsigned flags = curr->flags; |
| |
| if (curr->func(curr, mode, wake_flags, key) && |
| (flags & WQ_FLAG_EXCLUSIVE) && !--nr_exclusive) |
| break; |
| } |
| } |
| |
| /* The last 'nr' parameter was added to the __wake_up_locked() function |
| * in 3.4 kernel. Define a new one prefixed with compat_ for the new API. |
| */ |
| void compat_wake_up_locked(wait_queue_head_t *q, unsigned int mode, int nr) |
| { |
| compat_wake_up_common(q, mode, nr, 0, NULL); |
| } |
| EXPORT_SYMBOL_GPL(compat_wake_up_locked); |
| |
| |
| #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,34)) |
| #include <linux/i2c.h> |
| #include <linux/i2c-algo-bit.h> |
| #include <linux/delay.h> |
| |
| #define setsda(adap, val) adap->setsda(adap->data, val) |
| #define setscl(adap, val) adap->setscl(adap->data, val) |
| #define getsda(adap) adap->getsda(adap->data) |
| #define getscl(adap) adap->getscl(adap->data) |
| |
| #define bit_dbg(level, dev, format, args...) \ |
| do {} while (0) |
| |
| static inline void sdalo(struct i2c_algo_bit_data *adap) |
| { |
| setsda(adap, 0); |
| udelay((adap->udelay + 1) / 2); |
| } |
| |
| static inline void sdahi(struct i2c_algo_bit_data *adap) |
| { |
| setsda(adap, 1); |
| udelay((adap->udelay + 1) / 2); |
| } |
| |
| static inline void scllo(struct i2c_algo_bit_data *adap) |
| { |
| setscl(adap, 0); |
| udelay(adap->udelay / 2); |
| } |
| |
| static int sclhi(struct i2c_algo_bit_data *adap) |
| { |
| unsigned long start; |
| |
| setscl(adap, 1); |
| |
| /* Not all adapters have scl sense line... */ |
| if (!adap->getscl) |
| goto done; |
| |
| start = jiffies; |
| while (!getscl(adap)) { |
| /* This hw knows how to read the clock line, so we wait |
| * until it actually gets high. This is safer as some |
| * chips may hold it low ("clock stretching") while they |
| * are processing data internally. |
| */ |
| if (time_after(jiffies, start + adap->timeout)) { |
| /* Test one last time, as we may have been preempted |
| * between last check and timeout test. |
| */ |
| if (getscl(adap)) |
| break; |
| return -ETIMEDOUT; |
| } |
| cpu_relax(); |
| } |
| #ifdef DEBUG |
| if (jiffies != start && i2c_debug >= 3) |
| pr_debug("i2c-algo-bit: needed %ld jiffies for SCL to go " |
| "high\n", jiffies - start); |
| #endif |
| |
| done: |
| udelay(adap->udelay); |
| return 0; |
| } |
| |
| static void i2c_start(struct i2c_algo_bit_data *adap) |
| { |
| /* assert: scl, sda are high */ |
| setsda(adap, 0); |
| udelay(adap->udelay); |
| scllo(adap); |
| } |
| |
| static void i2c_repstart(struct i2c_algo_bit_data *adap) |
| { |
| /* assert: scl is low */ |
| sdahi(adap); |
| sclhi(adap); |
| setsda(adap, 0); |
| udelay(adap->udelay); |
| scllo(adap); |
| } |
| |
| |
| static void i2c_stop(struct i2c_algo_bit_data *adap) |
| { |
| /* assert: scl is low */ |
| sdalo(adap); |
| sclhi(adap); |
| setsda(adap, 1); |
| udelay(adap->udelay); |
| } |
| |
| static int i2c_outb(struct i2c_adapter *i2c_adap, unsigned char c) |
| { |
| int i; |
| int sb; |
| int ack; |
| struct i2c_algo_bit_data *adap = i2c_adap->algo_data; |
| |
| /* assert: scl is low */ |
| for (i = 7; i >= 0; i--) { |
| sb = (c >> i) & 1; |
| setsda(adap, sb); |
| udelay((adap->udelay + 1) / 2); |
| if (sclhi(adap) < 0) { /* timed out */ |
| bit_dbg(1, &i2c_adap->dev, "i2c_outb: 0x%02x, " |
| "timeout at bit #%d\n", (int)c, i); |
| return -ETIMEDOUT; |
| } |
| /* FIXME do arbitration here: |
| * if (sb && !getsda(adap)) -> ouch! Get out of here. |
| * |
| * Report a unique code, so higher level code can retry |
| * the whole (combined) message and *NOT* issue STOP. |
| */ |
| scllo(adap); |
| } |
| sdahi(adap); |
| if (sclhi(adap) < 0) { /* timeout */ |
| bit_dbg(1, &i2c_adap->dev, "i2c_outb: 0x%02x, " |
| "timeout at ack\n", (int)c); |
| return -ETIMEDOUT; |
| } |
| |
| /* read ack: SDA should be pulled down by slave, or it may |
| * NAK (usually to report problems with the data we wrote). |
| */ |
| ack = !getsda(adap); /* ack: sda is pulled low -> success */ |
| bit_dbg(2, &i2c_adap->dev, "i2c_outb: 0x%02x %s\n", (int)c, |
| ack ? "A" : "NA"); |
| |
| scllo(adap); |
| return ack; |
| /* assert: scl is low (sda undef) */ |
| } |
| |
| static int i2c_inb(struct i2c_adapter *i2c_adap) |
| { |
| /* read byte via i2c port, without start/stop sequence */ |
| /* acknowledge is sent in i2c_read. */ |
| int i; |
| unsigned char indata = 0; |
| struct i2c_algo_bit_data *adap = i2c_adap->algo_data; |
| |
| /* assert: scl is low */ |
| sdahi(adap); |
| for (i = 0; i < 8; i++) { |
| if (sclhi(adap) < 0) { /* timeout */ |
| bit_dbg(1, &i2c_adap->dev, "i2c_inb: timeout at bit " |
| "#%d\n", 7 - i); |
| return -ETIMEDOUT; |
| } |
| indata *= 2; |
| if (getsda(adap)) |
| indata |= 0x01; |
| setscl(adap, 0); |
| udelay(i == 7 ? adap->udelay / 2 : adap->udelay); |
| } |
| /* assert: scl is low */ |
| return indata; |
| } |
| |
| static int try_address(struct i2c_adapter *i2c_adap, |
| unsigned char addr, int retries) |
| { |
| struct i2c_algo_bit_data *adap = i2c_adap->algo_data; |
| int i, ret = 0; |
| |
| for (i = 0; i <= retries; i++) { |
| ret = i2c_outb(i2c_adap, addr); |
| if (ret == 1 || i == retries) |
| break; |
| bit_dbg(3, &i2c_adap->dev, "emitting stop condition\n"); |
| i2c_stop(adap); |
| udelay(adap->udelay); |
| yield(); |
| bit_dbg(3, &i2c_adap->dev, "emitting start condition\n"); |
| i2c_start(adap); |
| } |
| if (i && ret) |
| bit_dbg(1, &i2c_adap->dev, "Used %d tries to %s client at " |
| "0x%02x: %s\n", i + 1, |
| addr & 1 ? "read from" : "write to", addr >> 1, |
| ret == 1 ? "success" : "failed, timeout?"); |
| return ret; |
| } |
| |
| static int bit_doAddress(struct i2c_adapter *i2c_adap, struct i2c_msg *msg) |
| { |
| unsigned short flags = msg->flags; |
| unsigned short nak_ok = msg->flags & I2C_M_IGNORE_NAK; |
| struct i2c_algo_bit_data *adap = i2c_adap->algo_data; |
| |
| unsigned char addr; |
| int ret, retries; |
| |
| retries = nak_ok ? 0 : i2c_adap->retries; |
| |
| if (flags & I2C_M_TEN) { |
| /* a ten bit address */ |
| addr = 0xf0 | ((msg->addr >> 7) & 0x06); |
| bit_dbg(2, &i2c_adap->dev, "addr0: %d\n", addr); |
| /* try extended address code...*/ |
| ret = try_address(i2c_adap, addr, retries); |
| if ((ret != 1) && !nak_ok) { |
| dev_err(&i2c_adap->dev, |
| "died at extended address code\n"); |
| return -ENXIO; |
| } |
| /* the remaining 8 bit address */ |
| ret = i2c_outb(i2c_adap, msg->addr & 0xff); |
| if ((ret != 1) && !nak_ok) { |
| /* the chip did not ack / xmission error occurred */ |
| dev_err(&i2c_adap->dev, "died at 2nd address code\n"); |
| return -ENXIO; |
| } |
| if (flags & I2C_M_RD) { |
| bit_dbg(3, &i2c_adap->dev, "emitting repeated " |
| "start condition\n"); |
| i2c_repstart(adap); |
| /* okay, now switch into reading mode */ |
| addr |= 0x01; |
| ret = try_address(i2c_adap, addr, retries); |
| if ((ret != 1) && !nak_ok) { |
| dev_err(&i2c_adap->dev, |
| "died at repeated address code\n"); |
| return -EIO; |
| } |
| } |
| } else { /* normal 7bit address */ |
| addr = msg->addr << 1; |
| if (flags & I2C_M_RD) |
| addr |= 1; |
| if (flags & I2C_M_REV_DIR_ADDR) |
| addr ^= 1; |
| ret = try_address(i2c_adap, addr, retries); |
| if ((ret != 1) && !nak_ok) |
| return -ENXIO; |
| } |
| |
| return 0; |
| } |
| |
| static int sendbytes(struct i2c_adapter *i2c_adap, struct i2c_msg *msg) |
| { |
| const unsigned char *temp = msg->buf; |
| int count = msg->len; |
| unsigned short nak_ok = msg->flags & I2C_M_IGNORE_NAK; |
| int retval; |
| int wrcount = 0; |
| |
| while (count > 0) { |
| retval = i2c_outb(i2c_adap, *temp); |
| |
| /* OK/ACK; or ignored NAK */ |
| if ((retval > 0) || (nak_ok && (retval == 0))) { |
| count--; |
| temp++; |
| wrcount++; |
| |
| /* A slave NAKing the master means the slave didn't like |
| * something about the data it saw. For example, maybe |
| * the SMBus PEC was wrong. |
| */ |
| } else if (retval == 0) { |
| dev_err(&i2c_adap->dev, "sendbytes: NAK bailout.\n"); |
| return -EIO; |
| |
| /* Timeout; or (someday) lost arbitration |
| * |
| * FIXME Lost ARB implies retrying the transaction from |
| * the first message, after the "winning" master issues |
| * its STOP. As a rule, upper layer code has no reason |
| * to know or care about this ... it is *NOT* an error. |
| */ |
| } else { |
| dev_err(&i2c_adap->dev, "sendbytes: error %d\n", |
| retval); |
| return retval; |
| } |
| } |
| return wrcount; |
| } |
| |
| static int acknak(struct i2c_adapter *i2c_adap, int is_ack) |
| { |
| struct i2c_algo_bit_data *adap = i2c_adap->algo_data; |
| |
| /* assert: sda is high */ |
| if (is_ack) /* send ack */ |
| setsda(adap, 0); |
| udelay((adap->udelay + 1) / 2); |
| if (sclhi(adap) < 0) { /* timeout */ |
| dev_err(&i2c_adap->dev, "readbytes: ack/nak timeout\n"); |
| return -ETIMEDOUT; |
| } |
| scllo(adap); |
| return 0; |
| } |
| |
| static int readbytes(struct i2c_adapter *i2c_adap, struct i2c_msg *msg) |
| { |
| int inval; |
| int rdcount = 0; /* counts bytes read */ |
| unsigned char *temp = msg->buf; |
| int count = msg->len; |
| const unsigned flags = msg->flags; |
| |
| while (count > 0) { |
| inval = i2c_inb(i2c_adap); |
| if (inval >= 0) { |
| *temp = inval; |
| rdcount++; |
| } else { /* read timed out */ |
| break; |
| } |
| |
| temp++; |
| count--; |
| |
| /* Some SMBus transactions require that we receive the |
| transaction length as the first read byte. */ |
| if (rdcount == 1 && (flags & I2C_M_RECV_LEN)) { |
| if (inval <= 0 || inval > I2C_SMBUS_BLOCK_MAX) { |
| if (!(flags & I2C_M_NO_RD_ACK)) |
| acknak(i2c_adap, 0); |
| dev_err(&i2c_adap->dev, "readbytes: invalid " |
| "block length (%d)\n", inval); |
| return -EPROTO; |
| } |
| /* The original count value accounts for the extra |
| bytes, that is, either 1 for a regular transaction, |
| or 2 for a PEC transaction. */ |
| count += inval; |
| msg->len += inval; |
| } |
| |
| bit_dbg(2, &i2c_adap->dev, "readbytes: 0x%02x %s\n", |
| inval, |
| (flags & I2C_M_NO_RD_ACK) |
| ? "(no ack/nak)" |
| : (count ? "A" : "NA")); |
| |
| if (!(flags & I2C_M_NO_RD_ACK)) { |
| inval = acknak(i2c_adap, count); |
| if (inval < 0) |
| return inval; |
| } |
| } |
| return rdcount; |
| } |
| |
| |
| static u32 bit_func(struct i2c_adapter *adap) |
| { |
| return I2C_FUNC_I2C | I2C_FUNC_NOSTART | I2C_FUNC_SMBUS_EMUL | |
| I2C_FUNC_SMBUS_READ_BLOCK_DATA | |
| I2C_FUNC_SMBUS_BLOCK_PROC_CALL | |
| I2C_FUNC_10BIT_ADDR | I2C_FUNC_PROTOCOL_MANGLING; |
| } |
| |
| static int bit_xfer(struct i2c_adapter *i2c_adap, |
| struct i2c_msg msgs[], int num) |
| { |
| struct i2c_msg *pmsg; |
| struct i2c_algo_bit_data *adap = i2c_adap->algo_data; |
| int i, ret; |
| unsigned short nak_ok; |
| |
| if (adap->pre_xfer) { |
| ret = adap->pre_xfer(i2c_adap); |
| if (ret < 0) |
| return ret; |
| } |
| |
| bit_dbg(3, &i2c_adap->dev, "emitting start condition\n"); |
| i2c_start(adap); |
| for (i = 0; i < num; i++) { |
| pmsg = &msgs[i]; |
| nak_ok = pmsg->flags & I2C_M_IGNORE_NAK; |
| if (!(pmsg->flags & I2C_M_NOSTART)) { |
| if (i) { |
| bit_dbg(3, &i2c_adap->dev, "emitting " |
| "repeated start condition\n"); |
| i2c_repstart(adap); |
| } |
| ret = bit_doAddress(i2c_adap, pmsg); |
| if ((ret != 0) && !nak_ok) { |
| bit_dbg(1, &i2c_adap->dev, "NAK from " |
| "device addr 0x%02x msg #%d\n", |
| msgs[i].addr, i); |
| goto bailout; |
| } |
| } |
| if (pmsg->flags & I2C_M_RD) { |
| /* read bytes into buffer*/ |
| ret = readbytes(i2c_adap, pmsg); |
| if (ret >= 1) |
| bit_dbg(2, &i2c_adap->dev, "read %d byte%s\n", |
| ret, ret == 1 ? "" : "s"); |
| if (ret < pmsg->len) { |
| if (ret >= 0) |
| ret = -EIO; |
| goto bailout; |
| } |
| } else { |
| /* write bytes from buffer */ |
| ret = sendbytes(i2c_adap, pmsg); |
| if (ret >= 1) |
| bit_dbg(2, &i2c_adap->dev, "wrote %d byte%s\n", |
| ret, ret == 1 ? "" : "s"); |
| if (ret < pmsg->len) { |
| if (ret >= 0) |
| ret = -EIO; |
| goto bailout; |
| } |
| } |
| } |
| ret = i; |
| |
| bailout: |
| bit_dbg(3, &i2c_adap->dev, "emitting stop condition\n"); |
| i2c_stop(adap); |
| |
| if (adap->post_xfer) |
| adap->post_xfer(i2c_adap); |
| return ret; |
| } |
| |
| |
| const struct i2c_algorithm i2c_bit_algo = { |
| .master_xfer = bit_xfer, |
| .functionality = bit_func, |
| }; |
| EXPORT_SYMBOL_GPL(i2c_bit_algo); |
| #endif |
| |
| int simple_open(struct inode *inode, struct file *file) |
| { |
| if (inode->i_private) |
| file->private_data = inode->i_private; |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(simple_open); |