X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=drivers%2Fw1%2Fw1_io.c;h=3ebe9726a9e55471ae9383fe262fc61de2727200;hb=22a0d6f1383c85a7a9759cb805fd06c848c9c4d3;hp=f7f7e8bec30eb9312adf50ffe07e995259c2db00;hpb=a9fb1c7b950bed4afe208c9d67e20f086bb6abbb;p=safe%2Fjmp%2Flinux-2.6 diff --git a/drivers/w1/w1_io.c b/drivers/w1/w1_io.c index f7f7e8b..3ebe972 100644 --- a/drivers/w1/w1_io.c +++ b/drivers/w1/w1_io.c @@ -23,10 +23,10 @@ #include #include +#include #include "w1.h" #include "w1_log.h" -#include "w1_io.h" static int w1_delay_parm = 1; module_param_named(delay_coef, w1_delay_parm, int, 0); @@ -50,7 +50,7 @@ static u8 w1_crc8_table[] = { 116, 42, 200, 150, 21, 75, 169, 247, 182, 232, 10, 84, 215, 137, 107, 53 }; -void w1_delay(unsigned long tm) +static void w1_delay(unsigned long tm) { udelay(tm * w1_delay_parm); } @@ -61,7 +61,7 @@ static u8 w1_read_bit(struct w1_master *dev); /** * Generates a write-0 or write-1 cycle and samples the level. */ -u8 w1_touch_bit(struct w1_master *dev, int bit) +static u8 w1_touch_bit(struct w1_master *dev, int bit) { if (dev->bus_master->touch_bit) return dev->bus_master->touch_bit(dev->bus_master->data, bit); @@ -69,7 +69,7 @@ u8 w1_touch_bit(struct w1_master *dev, int bit) return w1_read_bit(dev); else { w1_write_bit(dev, 0); - return(0); + return 0; } } @@ -93,6 +93,40 @@ static void w1_write_bit(struct w1_master *dev, int bit) } /** + * Pre-write operation, currently only supporting strong pullups. + * Program the hardware for a strong pullup, if one has been requested and + * the hardware supports it. + * + * @param dev the master device + */ +static void w1_pre_write(struct w1_master *dev) +{ + if (dev->pullup_duration && + dev->enable_pullup && dev->bus_master->set_pullup) { + dev->bus_master->set_pullup(dev->bus_master->data, + dev->pullup_duration); + } +} + +/** + * Post-write operation, currently only supporting strong pullups. + * If a strong pullup was requested, clear it if the hardware supports + * them, or execute the delay otherwise, in either case clear the request. + * + * @param dev the master device + */ +static void w1_post_write(struct w1_master *dev) +{ + if (dev->pullup_duration) { + if (dev->enable_pullup && dev->bus_master->set_pullup) + dev->bus_master->set_pullup(dev->bus_master->data, 0); + else + msleep(dev->pullup_duration); + dev->pullup_duration = 0; + } +} + +/** * Writes 8 bits. * * @param dev the master device @@ -102,12 +136,19 @@ void w1_write_8(struct w1_master *dev, u8 byte) { int i; - if (dev->bus_master->write_byte) + if (dev->bus_master->write_byte) { + w1_pre_write(dev); dev->bus_master->write_byte(dev->bus_master->data, byte); + } else - for (i = 0; i < 8; ++i) + for (i = 0; i < 8; ++i) { + if (i == 7) + w1_pre_write(dev); w1_touch_bit(dev, (byte >> i) & 0x1); + } + w1_post_write(dev); } +EXPORT_SYMBOL_GPL(w1_write_8); /** @@ -143,17 +184,17 @@ static u8 w1_read_bit(struct w1_master *dev) */ u8 w1_triplet(struct w1_master *dev, int bdir) { - if ( dev->bus_master->triplet ) - return(dev->bus_master->triplet(dev->bus_master->data, bdir)); + if (dev->bus_master->triplet) + return dev->bus_master->triplet(dev->bus_master->data, bdir); else { u8 id_bit = w1_touch_bit(dev, 1); u8 comp_bit = w1_touch_bit(dev, 1); u8 retval; - if ( id_bit && comp_bit ) - return(0x03); /* error */ + if (id_bit && comp_bit) + return 0x03; /* error */ - if ( !id_bit && !comp_bit ) { + if (!id_bit && !comp_bit) { /* Both bits are valid, take the direction given */ retval = bdir ? 0x04 : 0; } else { @@ -162,11 +203,11 @@ u8 w1_triplet(struct w1_master *dev, int bdir) retval = id_bit ? 0x05 : 0x02; } - if ( dev->bus_master->touch_bit ) + if (dev->bus_master->touch_bit) w1_touch_bit(dev, bdir); else w1_write_bit(dev, bdir); - return(retval); + return retval; } } @@ -176,7 +217,7 @@ u8 w1_triplet(struct w1_master *dev, int bdir) * @param dev the master device * @return the byte read */ -u8 w1_read_8(struct w1_master * dev) +u8 w1_read_8(struct w1_master *dev) { int i; u8 res = 0; @@ -189,6 +230,7 @@ u8 w1_read_8(struct w1_master * dev) return res; } +EXPORT_SYMBOL_GPL(w1_read_8); /** * Writes a series of bytes. @@ -196,18 +238,46 @@ u8 w1_read_8(struct w1_master * dev) * @param dev the master device * @param buf pointer to the data to write * @param len the number of bytes to write - * @return the byte read */ void w1_write_block(struct w1_master *dev, const u8 *buf, int len) { int i; - if (dev->bus_master->write_block) + if (dev->bus_master->write_block) { + w1_pre_write(dev); dev->bus_master->write_block(dev->bus_master->data, buf, len); + } else for (i = 0; i < len; ++i) - w1_write_8(dev, buf[i]); + w1_write_8(dev, buf[i]); /* calls w1_pre_write */ + w1_post_write(dev); +} +EXPORT_SYMBOL_GPL(w1_write_block); + +/** + * Touches a series of bytes. + * + * @param dev the master device + * @param buf pointer to the data to write + * @param len the number of bytes to write + */ +void w1_touch_block(struct w1_master *dev, u8 *buf, int len) +{ + int i, j; + u8 tmp; + + for (i = 0; i < len; ++i) { + tmp = 0; + for (j = 0; j < 8; ++j) { + if (j == 7) + w1_pre_write(dev); + tmp |= w1_touch_bit(dev, (buf[i] >> j) & 0x1) << j; + } + + buf[i] = tmp; + } } +EXPORT_SYMBOL_GPL(w1_touch_block); /** * Reads a series of bytes. @@ -232,6 +302,7 @@ u8 w1_read_block(struct w1_master *dev, u8 *buf, int len) return ret; } +EXPORT_SYMBOL_GPL(w1_read_block); /** * Issues a reset bus sequence. @@ -247,16 +318,29 @@ int w1_reset_bus(struct w1_master *dev) result = dev->bus_master->reset_bus(dev->bus_master->data) & 0x1; else { dev->bus_master->write_bit(dev->bus_master->data, 0); + /* minimum 480, max ? us + * be nice and sleep, except 18b20 spec lists 960us maximum, + * so until we can sleep with microsecond accuracy, spin. + * Feel free to come up with some other way to give up the + * cpu for such a short amount of time AND get it back in + * the maximum amount of time. + */ w1_delay(480); dev->bus_master->write_bit(dev->bus_master->data, 1); w1_delay(70); result = dev->bus_master->read_bit(dev->bus_master->data) & 0x1; - w1_delay(410); + /* minmum 70 (above) + 410 = 480 us + * There aren't any timing requirements between a reset and + * the following transactions. Sleeping is safe here. + */ + /* w1_delay(410); min required time */ + msleep(1); } return result; } +EXPORT_SYMBOL_GPL(w1_reset_bus); u8 w1_calc_crc8(u8 * data, int len) { @@ -267,14 +351,16 @@ u8 w1_calc_crc8(u8 * data, int len) return crc; } +EXPORT_SYMBOL_GPL(w1_calc_crc8); -void w1_search_devices(struct w1_master *dev, w1_slave_found_callback cb) +void w1_search_devices(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb) { dev->attempts++; if (dev->bus_master->search) - dev->bus_master->search(dev->bus_master->data, cb); + dev->bus_master->search(dev->bus_master->data, dev, + search_type, cb); else - w1_search(dev, cb); + w1_search(dev, search_type, cb); } /** @@ -294,19 +380,28 @@ int w1_reset_select_slave(struct w1_slave *sl) w1_write_8(sl->master, W1_SKIP_ROM); else { u8 match[9] = {W1_MATCH_ROM, }; - memcpy(&match[1], (u8 *)&sl->reg_num, 8); + u64 rn = le64_to_cpu(*((u64*)&sl->reg_num)); + + memcpy(&match[1], &rn, 8); w1_write_block(sl->master, match, 9); } return 0; } +EXPORT_SYMBOL_GPL(w1_reset_select_slave); -EXPORT_SYMBOL(w1_touch_bit); -EXPORT_SYMBOL(w1_write_8); -EXPORT_SYMBOL(w1_read_8); -EXPORT_SYMBOL(w1_reset_bus); -EXPORT_SYMBOL(w1_calc_crc8); -EXPORT_SYMBOL(w1_delay); -EXPORT_SYMBOL(w1_read_block); -EXPORT_SYMBOL(w1_write_block); -EXPORT_SYMBOL(w1_search_devices); -EXPORT_SYMBOL(w1_reset_select_slave); +/** + * Put out a strong pull-up of the specified duration after the next write + * operation. Not all hardware supports strong pullups. Hardware that + * doesn't support strong pullups will sleep for the given time after the + * write operation without a strong pullup. This is a one shot request for + * the next write, specifying zero will clear a previous request. + * The w1 master lock must be held. + * + * @param delay time in milliseconds + * @return 0=success, anything else=error + */ +void w1_next_pullup(struct w1_master *dev, int delay) +{ + dev->pullup_duration = delay; +} +EXPORT_SYMBOL_GPL(w1_next_pullup);