diff options
Diffstat (limited to 'compat/compat-3.4.c')
| -rw-r--r-- | compat/compat-3.4.c | 796 |
1 files changed, 796 insertions, 0 deletions
diff --git a/compat/compat-3.4.c b/compat/compat-3.4.c new file mode 100644 index 0000000..1718cd2 --- /dev/null +++ b/compat/compat-3.4.c @@ -0,0 +1,796 @@ +/* + * 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); |