diff options
Diffstat (limited to 'drivers/w1')
| -rw-r--r-- | drivers/w1/masters/ds1wm.c | 4 | ||||
| -rw-r--r-- | drivers/w1/masters/omap_hdq.c | 30 | ||||
| -rw-r--r-- | drivers/w1/slaves/Kconfig | 13 | ||||
| -rw-r--r-- | drivers/w1/slaves/Makefile | 1 | ||||
| -rw-r--r-- | drivers/w1/slaves/w1_bq27000.c | 4 | ||||
| -rw-r--r-- | drivers/w1/slaves/w1_ds2408.c | 24 | ||||
| -rw-r--r-- | drivers/w1/slaves/w1_ds2423.c | 4 | ||||
| -rw-r--r-- | drivers/w1/slaves/w1_ds2431.c | 8 | ||||
| -rw-r--r-- | drivers/w1/slaves/w1_ds2433.c | 8 | ||||
| -rw-r--r-- | drivers/w1/slaves/w1_ds2760.c | 8 | ||||
| -rw-r--r-- | drivers/w1/slaves/w1_ds2780.c | 22 | ||||
| -rw-r--r-- | drivers/w1/slaves/w1_ds2780.h | 2 | ||||
| -rw-r--r-- | drivers/w1/slaves/w1_ds2781.c | 22 | ||||
| -rw-r--r-- | drivers/w1/slaves/w1_ds2781.h | 2 | ||||
| -rw-r--r-- | drivers/w1/slaves/w1_ds28e04.c | 469 | ||||
| -rw-r--r-- | drivers/w1/slaves/w1_therm.c | 10 | ||||
| -rw-r--r-- | drivers/w1/w1.c | 23 | ||||
| -rw-r--r-- | drivers/w1/w1.h | 1 | ||||
| -rw-r--r-- | drivers/w1/w1_family.h | 1 | ||||
| -rw-r--r-- | drivers/w1/w1_int.c | 3 |
20 files changed, 560 insertions, 99 deletions
diff --git a/drivers/w1/masters/ds1wm.c b/drivers/w1/masters/ds1wm.c index a0c8965c1a79..530a2d309063 100644 --- a/drivers/w1/masters/ds1wm.c +++ b/drivers/w1/masters/ds1wm.c @@ -334,7 +334,9 @@ static void ds1wm_search(void *data, struct w1_master *master_dev, return; } + mutex_lock(&master_dev->bus_mutex); if (ds1wm_reset(ds1wm_data)) { + mutex_unlock(&master_dev->bus_mutex); dev_dbg(&ds1wm_data->pdev->dev, "pass: %d reset error (or no slaves)\n", pass); break; @@ -387,6 +389,7 @@ static void ds1wm_search(void *data, struct w1_master *master_dev, } if (ds1wm_data->read_error) { + mutex_unlock(&master_dev->bus_mutex); dev_err(&ds1wm_data->pdev->dev, "pass: %d read error, retrying\n", pass); break; @@ -400,6 +403,7 @@ static void ds1wm_search(void *data, struct w1_master *master_dev, dev_dbg(&ds1wm_data->pdev->dev, "pass: %d resetting bus\n", pass); ds1wm_reset(ds1wm_data); + mutex_unlock(&master_dev->bus_mutex); if ((r_prime & ((u64)1 << 63)) && (d & ((u64)1 << 63))) { dev_err(&ds1wm_data->pdev->dev, "pass: %d bus error, retrying\n", pass); diff --git a/drivers/w1/masters/omap_hdq.c b/drivers/w1/masters/omap_hdq.c index 291897c881be..4b0fcf3c2d03 100644 --- a/drivers/w1/masters/omap_hdq.c +++ b/drivers/w1/masters/omap_hdq.c @@ -178,6 +178,7 @@ static int hdq_write_byte(struct hdq_data *hdq_data, u8 val, u8 *status) hdq_data->hdq_irqstatus, OMAP_HDQ_TIMEOUT); if (ret == 0) { dev_dbg(hdq_data->dev, "TX wait elapsed\n"); + ret = -ETIMEDOUT; goto out; } @@ -185,7 +186,7 @@ static int hdq_write_byte(struct hdq_data *hdq_data, u8 val, u8 *status) /* check irqstatus */ if (!(*status & OMAP_HDQ_INT_STATUS_TXCOMPLETE)) { dev_dbg(hdq_data->dev, "timeout waiting for" - "TXCOMPLETE/RXCOMPLETE, %x", *status); + " TXCOMPLETE/RXCOMPLETE, %x", *status); ret = -ETIMEDOUT; goto out; } @@ -196,7 +197,7 @@ static int hdq_write_byte(struct hdq_data *hdq_data, u8 val, u8 *status) OMAP_HDQ_FLAG_CLEAR, &tmp_status); if (ret) { dev_dbg(hdq_data->dev, "timeout waiting GO bit" - "return to zero, %x", tmp_status); + " return to zero, %x", tmp_status); } out: @@ -339,7 +340,7 @@ static int omap_hdq_break(struct hdq_data *hdq_data) &tmp_status); if (ret) dev_dbg(hdq_data->dev, "timeout waiting INIT&GO bits" - "return to zero, %x", tmp_status); + " return to zero, %x", tmp_status); out: mutex_unlock(&hdq_data->hdq_mutex); @@ -351,7 +352,6 @@ static int hdq_read_byte(struct hdq_data *hdq_data, u8 *val) { int ret = 0; u8 status; - unsigned long timeout = jiffies + OMAP_HDQ_TIMEOUT; ret = mutex_lock_interruptible(&hdq_data->hdq_mutex); if (ret < 0) { @@ -369,22 +369,20 @@ static int hdq_read_byte(struct hdq_data *hdq_data, u8 *val) OMAP_HDQ_CTRL_STATUS_DIR | OMAP_HDQ_CTRL_STATUS_GO, OMAP_HDQ_CTRL_STATUS_DIR | OMAP_HDQ_CTRL_STATUS_GO); /* - * The RX comes immediately after TX. It - * triggers another interrupt before we - * sleep. So we have to wait for RXCOMPLETE bit. + * The RX comes immediately after TX. */ - while (!(hdq_data->hdq_irqstatus - & OMAP_HDQ_INT_STATUS_RXCOMPLETE) - && time_before(jiffies, timeout)) { - schedule_timeout_uninterruptible(1); - } + wait_event_timeout(hdq_wait_queue, + (hdq_data->hdq_irqstatus + & OMAP_HDQ_INT_STATUS_RXCOMPLETE), + OMAP_HDQ_TIMEOUT); + hdq_reg_merge(hdq_data, OMAP_HDQ_CTRL_STATUS, 0, OMAP_HDQ_CTRL_STATUS_DIR); status = hdq_data->hdq_irqstatus; /* check irqstatus */ if (!(status & OMAP_HDQ_INT_STATUS_RXCOMPLETE)) { dev_dbg(hdq_data->dev, "timeout waiting for" - "RXCOMPLETE, %x", status); + " RXCOMPLETE, %x", status); ret = -ETIMEDOUT; goto out; } @@ -394,7 +392,7 @@ static int hdq_read_byte(struct hdq_data *hdq_data, u8 *val) out: mutex_unlock(&hdq_data->hdq_mutex); rtn: - return 0; + return ret; } @@ -456,7 +454,7 @@ static int omap_hdq_put(struct hdq_data *hdq_data) if (0 == hdq_data->hdq_usecount) { dev_dbg(hdq_data->dev, "attempt to decrement use count" - "when it is zero"); + " when it is zero"); ret = -EINVAL; } else { hdq_data->hdq_usecount--; @@ -524,7 +522,7 @@ static void omap_w1_write_byte(void *_hdq, u8 byte) mutex_unlock(&hdq_data->hdq_mutex); ret = hdq_write_byte(hdq_data, byte, &status); - if (ret == 0) { + if (ret < 0) { dev_dbg(hdq_data->dev, "TX failure:Ctrl status %x\n", status); return; } diff --git a/drivers/w1/slaves/Kconfig b/drivers/w1/slaves/Kconfig index eb9e376d6244..67526690acbc 100644 --- a/drivers/w1/slaves/Kconfig +++ b/drivers/w1/slaves/Kconfig @@ -94,6 +94,19 @@ config W1_SLAVE_DS2781 If you are unsure, say N. +config W1_SLAVE_DS28E04 + tristate "4096-Bit Addressable 1-Wire EEPROM with PIO (DS28E04-100)" + depends on W1 + select CRC16 + help + If you enable this you will have the DS28E04-100 + chip support. + + Say Y here if you want to use a 1-wire + 4kb EEPROM with PIO family device (DS28E04). + + If you are unsure, say N. + config W1_SLAVE_BQ27000 tristate "BQ27000 slave support" depends on W1 diff --git a/drivers/w1/slaves/Makefile b/drivers/w1/slaves/Makefile index c4f1859fb520..05188f6aab5a 100644 --- a/drivers/w1/slaves/Makefile +++ b/drivers/w1/slaves/Makefile @@ -12,3 +12,4 @@ obj-$(CONFIG_W1_SLAVE_DS2760) += w1_ds2760.o obj-$(CONFIG_W1_SLAVE_DS2780) += w1_ds2780.o obj-$(CONFIG_W1_SLAVE_DS2781) += w1_ds2781.o obj-$(CONFIG_W1_SLAVE_BQ27000) += w1_bq27000.o +obj-$(CONFIG_W1_SLAVE_DS28E04) += w1_ds28e04.o diff --git a/drivers/w1/slaves/w1_bq27000.c b/drivers/w1/slaves/w1_bq27000.c index 52ad812fa1e7..773dca5beafe 100644 --- a/drivers/w1/slaves/w1_bq27000.c +++ b/drivers/w1/slaves/w1_bq27000.c @@ -31,10 +31,10 @@ static int w1_bq27000_read(struct device *dev, unsigned int reg) u8 val; struct w1_slave *sl = container_of(dev->parent, struct w1_slave, dev); - mutex_lock(&sl->master->mutex); + mutex_lock(&sl->master->bus_mutex); w1_write_8(sl->master, HDQ_CMD_READ | reg); val = w1_read_8(sl->master); - mutex_unlock(&sl->master->mutex); + mutex_unlock(&sl->master->bus_mutex); return val; } diff --git a/drivers/w1/slaves/w1_ds2408.c b/drivers/w1/slaves/w1_ds2408.c index 8e813eed0f0a..441ad3a3b586 100644 --- a/drivers/w1/slaves/w1_ds2408.c +++ b/drivers/w1/slaves/w1_ds2408.c @@ -52,11 +52,11 @@ static int _read_reg(struct w1_slave *sl, u8 address, unsigned char* buf) if (!buf) return -EINVAL; - mutex_lock(&sl->master->mutex); + mutex_lock(&sl->master->bus_mutex); dev_dbg(&sl->dev, "mutex locked"); if (w1_reset_select_slave(sl)) { - mutex_unlock(&sl->master->mutex); + mutex_unlock(&sl->master->bus_mutex); return -EIO; } @@ -66,7 +66,7 @@ static int _read_reg(struct w1_slave *sl, u8 address, unsigned char* buf) w1_write_block(sl->master, wrbuf, 3); *buf = w1_read_8(sl->master); - mutex_unlock(&sl->master->mutex); + mutex_unlock(&sl->master->bus_mutex); dev_dbg(&sl->dev, "mutex unlocked"); return 1; } @@ -165,7 +165,7 @@ static ssize_t w1_f29_write_output( return -EFAULT; dev_dbg(&sl->dev, "locking mutex for write_output"); - mutex_lock(&sl->master->mutex); + mutex_lock(&sl->master->bus_mutex); dev_dbg(&sl->dev, "mutex locked"); if (w1_reset_select_slave(sl)) @@ -200,14 +200,14 @@ static ssize_t w1_f29_write_output( /* read the result of the READ_PIO_REGS command */ if (w1_read_8(sl->master) == *buf) { /* success! */ - mutex_unlock(&sl->master->mutex); + mutex_unlock(&sl->master->bus_mutex); dev_dbg(&sl->dev, "mutex unlocked, retries:%d", retries); return 1; } } error: - mutex_unlock(&sl->master->mutex); + mutex_unlock(&sl->master->bus_mutex); dev_dbg(&sl->dev, "mutex unlocked in error, retries:%d", retries); return -EIO; @@ -228,7 +228,7 @@ static ssize_t w1_f29_write_activity( if (count != 1 || off != 0) return -EFAULT; - mutex_lock(&sl->master->mutex); + mutex_lock(&sl->master->bus_mutex); if (w1_reset_select_slave(sl)) goto error; @@ -236,7 +236,7 @@ static ssize_t w1_f29_write_activity( while (retries--) { w1_write_8(sl->master, W1_F29_FUNC_RESET_ACTIVITY_LATCHES); if (w1_read_8(sl->master) == W1_F29_SUCCESS_CONFIRM_BYTE) { - mutex_unlock(&sl->master->mutex); + mutex_unlock(&sl->master->bus_mutex); return 1; } if (w1_reset_resume_command(sl->master)) @@ -244,7 +244,7 @@ static ssize_t w1_f29_write_activity( } error: - mutex_unlock(&sl->master->mutex); + mutex_unlock(&sl->master->bus_mutex); return -EIO; } @@ -263,7 +263,7 @@ static ssize_t w1_f29_write_status_control( if (count != 1 || off != 0) return -EFAULT; - mutex_lock(&sl->master->mutex); + mutex_lock(&sl->master->bus_mutex); if (w1_reset_select_slave(sl)) goto error; @@ -285,12 +285,12 @@ static ssize_t w1_f29_write_status_control( w1_write_block(sl->master, w1_buf, 3); if (w1_read_8(sl->master) == *buf) { /* success! */ - mutex_unlock(&sl->master->mutex); + mutex_unlock(&sl->master->bus_mutex); return 1; } } error: - mutex_unlock(&sl->master->mutex); + mutex_unlock(&sl->master->bus_mutex); return -EIO; } diff --git a/drivers/w1/slaves/w1_ds2423.c b/drivers/w1/slaves/w1_ds2423.c index 7a7dbe5026f1..40a10b5ed120 100644 --- a/drivers/w1/slaves/w1_ds2423.c +++ b/drivers/w1/slaves/w1_ds2423.c @@ -66,7 +66,7 @@ static ssize_t w1_counter_read(struct device *device, wrbuf[0] = 0xA5; wrbuf[1] = rom_addr & 0xFF; wrbuf[2] = rom_addr >> 8; - mutex_lock(&dev->mutex); + mutex_lock(&dev->bus_mutex); if (!w1_reset_select_slave(sl)) { w1_write_block(dev, wrbuf, 3); read_byte_count = 0; @@ -124,7 +124,7 @@ static ssize_t w1_counter_read(struct device *device, } else { c -= snprintf(out_buf + PAGE_SIZE - c, c, "Connection error"); } - mutex_unlock(&dev->mutex); + mutex_unlock(&dev->bus_mutex); return PAGE_SIZE - c; } diff --git a/drivers/w1/slaves/w1_ds2431.c b/drivers/w1/slaves/w1_ds2431.c index 84e2410aec1d..984b30331a45 100644 --- a/drivers/w1/slaves/w1_ds2431.c +++ b/drivers/w1/slaves/w1_ds2431.c @@ -107,7 +107,7 @@ static ssize_t w1_f2d_read_bin(struct file *filp, struct kobject *kobj, if (count == 0) return 0; - mutex_lock(&sl->master->mutex); + mutex_lock(&sl->master->bus_mutex); /* read directly from the EEPROM in chunks of W1_F2D_READ_MAXLEN */ while (todo > 0) { @@ -126,7 +126,7 @@ static ssize_t w1_f2d_read_bin(struct file *filp, struct kobject *kobj, off += W1_F2D_READ_MAXLEN; } - mutex_unlock(&sl->master->mutex); + mutex_unlock(&sl->master->bus_mutex); return count; } @@ -214,7 +214,7 @@ static ssize_t w1_f2d_write_bin(struct file *filp, struct kobject *kobj, if (count == 0) return 0; - mutex_lock(&sl->master->mutex); + mutex_lock(&sl->master->bus_mutex); /* Can only write data in blocks of the size of the scratchpad */ addr = off; @@ -259,7 +259,7 @@ static ssize_t w1_f2d_write_bin(struct file *filp, struct kobject *kobj, } out_up: - mutex_unlock(&sl->master->mutex); + mutex_unlock(&sl->master->bus_mutex); return count; } diff --git a/drivers/w1/slaves/w1_ds2433.c b/drivers/w1/slaves/w1_ds2433.c index 0f7b8f9c509a..85f2cdb27fa2 100644 --- a/drivers/w1/slaves/w1_ds2433.c +++ b/drivers/w1/slaves/w1_ds2433.c @@ -107,7 +107,7 @@ static ssize_t w1_f23_read_bin(struct file *filp, struct kobject *kobj, if ((count = w1_f23_fix_count(off, count, W1_EEPROM_SIZE)) == 0) return 0; - mutex_lock(&sl->master->mutex); + mutex_lock(&sl->master->bus_mutex); #ifdef CONFIG_W1_SLAVE_DS2433_CRC @@ -138,7 +138,7 @@ static ssize_t w1_f23_read_bin(struct file *filp, struct kobject *kobj, #endif /* CONFIG_W1_SLAVE_DS2433_CRC */ out_up: - mutex_unlock(&sl->master->mutex); + mutex_unlock(&sl->master->bus_mutex); return count; } @@ -233,7 +233,7 @@ static ssize_t w1_f23_write_bin(struct file *filp, struct kobject *kobj, } #endif /* CONFIG_W1_SLAVE_DS2433_CRC */ - mutex_lock(&sl->master->mutex); + mutex_lock(&sl->master->bus_mutex); /* Can only write data to one page at a time */ idx = 0; @@ -251,7 +251,7 @@ static ssize_t w1_f23_write_bin(struct file *filp, struct kobject *kobj, } out_up: - mutex_unlock(&sl->master->mutex); + mutex_unlock(&sl->master->bus_mutex); return count; } diff --git a/drivers/w1/slaves/w1_ds2760.c b/drivers/w1/slaves/w1_ds2760.c index 5754c9a4f58b..aa7bd5fa2fa8 100644 --- a/drivers/w1/slaves/w1_ds2760.c +++ b/drivers/w1/slaves/w1_ds2760.c @@ -31,7 +31,7 @@ static int w1_ds2760_io(struct device *dev, char *buf, int addr, size_t count, if (!dev) return 0; - mutex_lock(&sl->master->mutex); + mutex_lock(&sl->master->bus_mutex); if (addr > DS2760_DATA_SIZE || addr < 0) { count = 0; @@ -54,7 +54,7 @@ static int w1_ds2760_io(struct device *dev, char *buf, int addr, size_t count, } out: - mutex_unlock(&sl->master->mutex); + mutex_unlock(&sl->master->bus_mutex); return count; } @@ -76,14 +76,14 @@ static int w1_ds2760_eeprom_cmd(struct device *dev, int addr, int cmd) if (!dev) return -EINVAL; - mutex_lock(&sl->master->mutex); + mutex_lock(&sl->master->bus_mutex); if (w1_reset_select_slave(sl) == 0) { w1_write_8(sl->master, cmd); w1_write_8(sl->master, addr); } - mutex_unlock(&sl->master->mutex); + mutex_unlock(&sl->master->bus_mutex); return 0; } diff --git a/drivers/w1/slaves/w1_ds2780.c b/drivers/w1/slaves/w1_ds2780.c index 39f78c0b143c..7b09307de0ef 100644 --- a/drivers/w1/slaves/w1_ds2780.c +++ b/drivers/w1/slaves/w1_ds2780.c @@ -60,30 +60,16 @@ int w1_ds2780_io(struct device *dev, char *buf, int addr, size_t count, if (!dev) return -ENODEV; - mutex_lock(&sl->master->mutex); + mutex_lock(&sl->master->bus_mutex); ret = w1_ds2780_do_io(dev, buf, addr, count, io); - mutex_unlock(&sl->master->mutex); + mutex_unlock(&sl->master->bus_mutex); return ret; } EXPORT_SYMBOL(w1_ds2780_io); -int w1_ds2780_io_nolock(struct device *dev, char *buf, int addr, size_t count, - int io) -{ - int ret; - - if (!dev) - return -ENODEV; - - ret = w1_ds2780_do_io(dev, buf, addr, count, io); - - return ret; -} -EXPORT_SYMBOL(w1_ds2780_io_nolock); - int w1_ds2780_eeprom_cmd(struct device *dev, int addr, int cmd) { struct w1_slave *sl = container_of(dev, struct w1_slave, dev); @@ -91,14 +77,14 @@ int w1_ds2780_eeprom_cmd(struct device *dev, int addr, int cmd) if (!dev) return -EINVAL; - mutex_lock(&sl->master->mutex); + mutex_lock(&sl->master->bus_mutex); if (w1_reset_select_slave(sl) == 0) { w1_write_8(sl->master, cmd); w1_write_8(sl->master, addr); } - mutex_unlock(&sl->master->mutex); + mutex_unlock(&sl->master->bus_mutex); return 0; } EXPORT_SYMBOL(w1_ds2780_eeprom_cmd); diff --git a/drivers/w1/slaves/w1_ds2780.h b/drivers/w1/slaves/w1_ds2780.h index 737379365021..a1fba79eb1b5 100644 --- a/drivers/w1/slaves/w1_ds2780.h +++ b/drivers/w1/slaves/w1_ds2780.h @@ -124,8 +124,6 @@ extern int w1_ds2780_io(struct device *dev, char *buf, int addr, size_t count, int io); -extern int w1_ds2780_io_nolock(struct device *dev, char *buf, int addr, - size_t count, int io); extern int w1_ds2780_eeprom_cmd(struct device *dev, int addr, int cmd); #endif /* !_W1_DS2780_H */ diff --git a/drivers/w1/slaves/w1_ds2781.c b/drivers/w1/slaves/w1_ds2781.c index 0d0c7985293f..877daf74159c 100644 --- a/drivers/w1/slaves/w1_ds2781.c +++ b/drivers/w1/slaves/w1_ds2781.c @@ -58,30 +58,16 @@ int w1_ds2781_io(struct device *dev, char *buf, int addr, size_t count, if (!dev) return -ENODEV; - mutex_lock(&sl->master->mutex); + mutex_lock(&sl->master->bus_mutex); ret = w1_ds2781_do_io(dev, buf, addr, count, io); - mutex_unlock(&sl->master->mutex); + mutex_unlock(&sl->master->bus_mutex); return ret; } EXPORT_SYMBOL(w1_ds2781_io); -int w1_ds2781_io_nolock(struct device *dev, char *buf, int addr, size_t count, - int io) -{ - int ret; - - if (!dev) - return -ENODEV; - - ret = w1_ds2781_do_io(dev, buf, addr, count, io); - - return ret; -} -EXPORT_SYMBOL(w1_ds2781_io_nolock); - int w1_ds2781_eeprom_cmd(struct device *dev, int addr, int cmd) { struct w1_slave *sl = container_of(dev, struct w1_slave, dev); @@ -89,14 +75,14 @@ int w1_ds2781_eeprom_cmd(struct device *dev, int addr, int cmd) if (!dev) return -EINVAL; - mutex_lock(&sl->master->mutex); + mutex_lock(&sl->master->bus_mutex); if (w1_reset_select_slave(sl) == 0) { w1_write_8(sl->master, cmd); w1_write_8(sl->master, addr); } - mutex_unlock(&sl->master->mutex); + mutex_unlock(&sl->master->bus_mutex); return 0; } EXPORT_SYMBOL(w1_ds2781_eeprom_cmd); diff --git a/drivers/w1/slaves/w1_ds2781.h b/drivers/w1/slaves/w1_ds2781.h index 82bc66497b43..557dfb0b4f64 100644 --- a/drivers/w1/slaves/w1_ds2781.h +++ b/drivers/w1/slaves/w1_ds2781.h @@ -129,8 +129,6 @@ extern int w1_ds2781_io(struct device *dev, char *buf, int addr, size_t count, int io); -extern int w1_ds2781_io_nolock(struct device *dev, char *buf, int addr, - size_t count, int io); extern int w1_ds2781_eeprom_cmd(struct device *dev, int addr, int cmd); #endif /* !_W1_DS2781_H */ diff --git a/drivers/w1/slaves/w1_ds28e04.c b/drivers/w1/slaves/w1_ds28e04.c new file mode 100644 index 000000000000..98117db595bb --- /dev/null +++ b/drivers/w1/slaves/w1_ds28e04.c @@ -0,0 +1,469 @@ +/* + * w1_ds28e04.c - w1 family 1C (DS28E04) driver + * + * Copyright (c) 2012 Markus Franke <franke.m@sebakmt.com> + * + * This source code is licensed under the GNU General Public License, + * Version 2. See the file COPYING for more details. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/device.h> +#include <linux/types.h> +#include <linux/delay.h> +#include <linux/slab.h> +#include <linux/crc16.h> +#include <linux/uaccess.h> + +#define CRC16_INIT 0 +#define CRC16_VALID 0xb001 + +#include "../w1.h" +#include "../w1_int.h" +#include "../w1_family.h" + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Markus Franke <franke.m@sebakmt.com>, <franm@hrz.tu-chemnitz.de>"); +MODULE_DESCRIPTION("w1 family 1C driver for DS28E04, 4kb EEPROM and PIO"); + +/* Allow the strong pullup to be disabled, but default to enabled. + * If it was disabled a parasite powered device might not get the required + * current to copy the data from the scratchpad to EEPROM. If it is enabled + * parasite powered devices have a better chance of getting the current + * required. + */ +static int w1_strong_pullup = 1; +module_param_named(strong_pullup, w1_strong_pullup, int, 0); + +/* enable/disable CRC checking on DS28E04-100 memory accesses */ +static char w1_enable_crccheck = 1; + +#define W1_EEPROM_SIZE 512 +#define W1_PAGE_COUNT 16 +#define W1_PAGE_SIZE 32 +#define W1_PAGE_BITS 5 +#define W1_PAGE_MASK 0x1F + +#define W1_F1C_READ_EEPROM 0xF0 +#define W1_F1C_WRITE_SCRATCH 0x0F +#define W1_F1C_READ_SCRATCH 0xAA +#define W1_F1C_COPY_SCRATCH 0x55 +#define W1_F1C_ACCESS_WRITE 0x5A + +#define W1_1C_REG_LOGIC_STATE 0x220 + +struct w1_f1C_data { + u8 memory[W1_EEPROM_SIZE]; + u32 validcrc; +}; + +/** + * Check the file size bounds and adjusts count as needed. + * This would not be needed if the file size didn't reset to 0 after a write. + */ +static inline size_t w1_f1C_fix_count(loff_t off, size_t count, size_t size) +{ + if (off > size) + return 0; + + if ((off + count) > size) + return size - off; + + return count; +} + +static int w1_f1C_refresh_block(struct w1_slave *sl, struct w1_f1C_data *data, + int block) +{ + u8 wrbuf[3]; + int off = block * W1_PAGE_SIZE; + + if (data->validcrc & (1 << block)) + return 0; + + if (w1_reset_select_slave(sl)) { + data->validcrc = 0; + return -EIO; + } + + wrbuf[0] = W1_F1C_READ_EEPROM; + wrbuf[1] = off & 0xff; + wrbuf[2] = off >> 8; + w1_write_block(sl->master, wrbuf, 3); + w1_read_block(sl->master, &data->memory[off], W1_PAGE_SIZE); + + /* cache the block if the CRC is valid */ + if (crc16(CRC16_INIT, &data->memory[off], W1_PAGE_SIZE) == CRC16_VALID) + data->validcrc |= (1 << block); + + return 0; +} + +static int w1_f1C_read(struct w1_slave *sl, int addr, int len, char *data) +{ + u8 wrbuf[3]; + + /* read directly from the EEPROM */ + if (w1_reset_select_slave(sl)) + return -EIO; + + wrbuf[0] = W1_F1C_READ_EEPROM; + wrbuf[1] = addr & 0xff; + wrbuf[2] = addr >> 8; + + w1_write_block(sl->master, wrbuf, sizeof(wrbuf)); + return w1_read_block(sl->master, data, len); +} + +static ssize_t w1_f1C_read_bin(struct file *filp, struct kobject *kobj, + struct bin_attribute *bin_attr, + char *buf, loff_t off, size_t count) +{ + struct w1_slave *sl = kobj_to_w1_slave(kobj); + struct w1_f1C_data *data = sl->family_data; + int i, min_page, max_page; + + count = w1_f1C_fix_count(off, count, W1_EEPROM_SIZE); + if (count == 0) + return 0; + + mutex_lock(&sl->master->mutex); + + if (w1_enable_crccheck) { + min_page = (off >> W1_PAGE_BITS); + max_page = (off + count - 1) >> W1_PAGE_BITS; + for (i = min_page; i <= max_page; i++) { + if (w1_f1C_refresh_block(sl, data, i)) { + count = -EIO; + goto out_up; + } + } + memcpy(buf, &data->memory[off], count); + } else { + count = w1_f1C_read(sl, off, count, buf); + } + +out_up: + mutex_unlock(&sl->master->mutex); + + return count; +} + +/** + * Writes to the scratchpad and reads it back for verification. + * Then copies the scratchpad to EEPROM. + * The data must be on one page. + * The master must be locked. + * + * @param sl The slave structure + * @param addr Address for the write + * @param len length must be <= (W1_PAGE_SIZE - (addr & W1_PAGE_MASK)) + * @param data The data to write + * @return 0=Success -1=failure + */ +static int w1_f1C_write(struct w1_slave *sl, int addr, int len, const u8 *data) +{ + u8 wrbuf[4]; + u8 rdbuf[W1_PAGE_SIZE + 3]; + u8 es = (addr + len - 1) & 0x1f; + unsigned int tm = 10; + int i; + struct w1_f1C_data *f1C = sl->family_data; + + /* Write the data to the scratchpad */ + if (w1_reset_select_slave(sl)) + return -1; + + wrbuf[0] = W1_F1C_WRITE_SCRATCH; + wrbuf[1] = addr & 0xff; + wrbuf[2] = addr >> 8; + + w1_write_block(sl->master, wrbuf, 3); + w1_write_block(sl->master, data, len); + + /* Read the scratchpad and verify */ + if (w1_reset_select_slave(sl)) + return -1; + + w1_write_8(sl->master, W1_F1C_READ_SCRATCH); + w1_read_block(sl->master, rdbuf, len + 3); + + /* Compare what was read against the data written */ + if ((rdbuf[0] != wrbuf[1]) || (rdbuf[1] != wrbuf[2]) || + (rdbuf[2] != es) || (memcmp(data, &rdbuf[3], len) != 0)) + return -1; + + /* Copy the scratchpad to EEPROM */ + if (w1_reset_select_slave(sl)) + return -1; + + wrbuf[0] = W1_F1C_COPY_SCRATCH; + wrbuf[3] = es; + + for (i = 0; i < sizeof(wrbuf); ++i) { + /* issue 10ms strong pullup (or delay) on the last byte + for writing the data from the scratchpad to EEPROM */ + if (w1_strong_pullup && i == sizeof(wrbuf)-1) + w1_next_pullup(sl->master, tm); + + w1_write_8(sl->master, wrbuf[i]); + } + + if (!w1_strong_pullup) + msleep(tm); + + if (w1_enable_crccheck) { + /* invalidate cached data */ + f1C->validcrc &= ~(1 << (addr >> W1_PAGE_BITS)); + } + + /* Reset the bus to wake up the EEPROM (this may not be needed) */ + w1_reset_bus(sl->master); + + return 0; +} + +static ssize_t w1_f1C_write_bin(struct file *filp, struct kobject *kobj, + struct bin_attribute *bin_attr, + char *buf, loff_t off, size_t count) + +{ + struct w1_slave *sl = kobj_to_w1_slave(kobj); + int addr, len, idx; + + count = w1_f1C_fix_count(off, count, W1_EEPROM_SIZE); + if (count == 0) + return 0; + + if (w1_enable_crccheck) { + /* can only write full blocks in cached mode */ + if ((off & W1_PAGE_MASK) || (count & W1_PAGE_MASK)) { + dev_err(&sl->dev, "invalid offset/count off=%d cnt=%zd\n", + (int)off, count); + return -EINVAL; + } + + /* make sure the block CRCs are valid */ + for (idx = 0; idx < count; idx += W1_PAGE_SIZE) { + if (crc16(CRC16_INIT, &buf[idx], W1_PAGE_SIZE) + != CRC16_VALID) { + dev_err(&sl->dev, "bad CRC at offset %d\n", + (int)off); + return -EINVAL; + } + } + } + + mutex_lock(&sl->master->mutex); + + /* Can only write data to one page at a time */ + idx = 0; + while (idx < count) { + addr = off + idx; + len = W1_PAGE_SIZE - (addr & W1_PAGE_MASK); + if (len > (count - idx)) + len = count - idx; + + if (w1_f1C_write(sl, addr, len, &buf[idx]) < 0) { + count = -EIO; + goto out_up; + } + idx += len; + } + +out_up: + mutex_unlock(&sl->master->mutex); + + return count; +} + +static ssize_t w1_f1C_read_pio(struct file *filp, struct kobject *kobj, + struct bin_attribute *bin_attr, + char *buf, loff_t off, size_t count) + +{ + struct w1_slave *sl = kobj_to_w1_slave(kobj); + int ret; + + /* check arguments */ + if (off != 0 || count != 1 || buf == NULL) + return -EINVAL; + + mutex_lock(&sl->master->mutex); + ret = w1_f1C_read(sl, W1_1C_REG_LOGIC_STATE, count, buf); + mutex_unlock(&sl->master->mutex); + + return ret; +} + +static ssize_t w1_f1C_write_pio(struct file *filp, struct kobject *kobj, + struct bin_attribute *bin_attr, + char *buf, loff_t off, size_t count) + +{ + struct w1_slave *sl = kobj_to_w1_slave(kobj); + u8 wrbuf[3]; + u8 ack; + + /* check arguments */ + if (off != 0 || count != 1 || buf == NULL) + return -EINVAL; + + mutex_lock(&sl->master->mutex); + + /* Write the PIO data */ + if (w1_reset_select_slave(sl)) { + mutex_unlock(&sl->master->mutex); + return -1; + } + + /* set bit 7..2 to value '1' */ + *buf = *buf | 0xFC; + + wrbuf[0] = W1_F1C_ACCESS_WRITE; + wrbuf[1] = *buf; + wrbuf[2] = ~(*buf); + w1_write_block(sl->master, wrbuf, 3); + + w1_read_block(sl->master, &ack, sizeof(ack)); + + mutex_unlock(&sl->master->mutex); + + /* check for acknowledgement */ + if (ack != 0xAA) + return -EIO; + + return count; +} + +static ssize_t w1_f1C_show_crccheck(struct device *dev, + struct device_attribute *attr, char *buf) +{ + if (put_user(w1_enable_crccheck + 0x30, buf)) + return -EFAULT; + + return sizeof(w1_enable_crccheck); +} + +static ssize_t w1_f1C_store_crccheck(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + char val; + + if (count != 1 || !buf) + return -EINVAL; + + if (get_user(val, buf)) + return -EFAULT; + + /* convert to decimal */ + val = val - 0x30; + if (val != 0 && val != 1) + return -EINVAL; + + /* set the new value */ + w1_enable_crccheck = val; + + return sizeof(w1_enable_crccheck); +} + +#define NB_SYSFS_BIN_FILES 2 +static struct bin_attribute w1_f1C_bin_attr[NB_SYSFS_BIN_FILES] = { + { + .attr = { + .name = "eeprom", + .mode = S_IRUGO | S_IWUSR, + }, + .size = W1_EEPROM_SIZE, + .read = w1_f1C_read_bin, + .write = w1_f1C_write_bin, + }, + { + .attr = { + .name = "pio", + .mode = S_IRUGO | S_IWUSR, + }, + .size = 1, + .read = w1_f1C_read_pio, + .write = w1_f1C_write_pio, + } +}; + +static DEVICE_ATTR(crccheck, S_IWUSR | S_IRUGO, + w1_f1C_show_crccheck, w1_f1C_store_crccheck); + +static int w1_f1C_add_slave(struct w1_slave *sl) +{ + int err = 0; + int i; + struct w1_f1C_data *data = NULL; + + if (w1_enable_crccheck) { + data = kzalloc(sizeof(struct w1_f1C_data), GFP_KERNEL); + if (!data) + return -ENOMEM; + sl->family_data = data; + } + + /* create binary sysfs attributes */ + for (i = 0; i < NB_SYSFS_BIN_FILES && !err; ++i) + err = sysfs_create_bin_file( + &sl->dev.kobj, &(w1_f1C_bin_attr[i])); + + if (!err) { + /* create device attributes */ + err = device_create_file(&sl->dev, &dev_attr_crccheck); + } + + if (err) { + /* remove binary sysfs attributes */ + for (i = 0; i < NB_SYSFS_BIN_FILES; ++i) + sysfs_remove_bin_file( + &sl->dev.kobj, &(w1_f1C_bin_attr[i])); + + kfree(data); + } + + return err; +} + +static void w1_f1C_remove_slave(struct w1_slave *sl) +{ + int i; + + kfree(sl->family_data); + sl->family_data = NULL; + + /* remove device attributes */ + device_remove_file(&sl->dev, &dev_attr_crccheck); + + /* remove binary sysfs attributes */ + for (i = 0; i < NB_SYSFS_BIN_FILES; ++i) + sysfs_remove_bin_file(&sl->dev.kobj, &(w1_f1C_bin_attr[i])); +} + +static struct w1_family_ops w1_f1C_fops = { + .add_slave = w1_f1C_add_slave, + .remove_slave = w1_f1C_remove_slave, +}; + +static struct w1_family w1_family_1C = { + .fid = W1_FAMILY_DS28E04, + .fops = &w1_f1C_fops, +}; + +static int __init w1_f1C_init(void) +{ + return w1_register_family(&w1_family_1C); +} + +static void __exit w1_f1C_fini(void) +{ + w1_unregister_family(&w1_family_1C); +} + +module_init(w1_f1C_init); +module_exit(w1_f1C_fini); diff --git a/drivers/w1/slaves/w1_therm.c b/drivers/w1/slaves/w1_therm.c index ff29ae747ee8..d90062b211f8 100644 --- a/drivers/w1/slaves/w1_therm.c +++ b/drivers/w1/slaves/w1_therm.c @@ -179,7 +179,7 @@ static ssize_t w1_therm_read(struct device *device, int i, max_trying = 10; ssize_t c = PAGE_SIZE; - i = mutex_lock_interruptible(&dev->mutex); + i = mutex_lock_interruptible(&dev->bus_mutex); if (i != 0) return i; @@ -207,19 +207,19 @@ static ssize_t w1_therm_read(struct device *device, w1_write_8(dev, W1_CONVERT_TEMP); if (external_power) { - mutex_unlock(&dev->mutex); + mutex_unlock(&dev->bus_mutex); sleep_rem = msleep_interruptible(tm); if (sleep_rem != 0) return -EINTR; - i = mutex_lock_interruptible(&dev->mutex); + i = mutex_lock_interruptible(&dev->bus_mutex); if (i != 0) return i; } else if (!w1_strong_pullup) { sleep_rem = msleep_interruptible(tm); if (sleep_rem != 0) { - mutex_unlock(&dev->mutex); + mutex_unlock(&dev->bus_mutex); return -EINTR; } } @@ -258,7 +258,7 @@ static ssize_t w1_therm_read(struct device *device, c -= snprintf(buf + PAGE_SIZE - c, c, "t=%d\n", w1_convert_temp(rom, sl->family->fid)); - mutex_unlock(&dev->mutex); + mutex_unlock(&dev->bus_mutex); return PAGE_SIZE - c; } diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c index 2f2e894ea0c8..1a574370d2cd 100644 --- a/drivers/w1/w1.c +++ b/drivers/w1/w1.c @@ -557,7 +557,7 @@ static int w1_uevent(struct device *dev, struct kobj_uevent_env *env) struct w1_master *md = NULL; struct w1_slave *sl = NULL; char *event_owner, *name; - int err; + int err = 0; if (dev->driver == &w1_master_driver) { md = container_of(dev, struct w1_master, dev); @@ -576,19 +576,17 @@ static int w1_uevent(struct device *dev, struct kobj_uevent_env *env) event_owner, name, dev_name(dev)); if (dev->driver != &w1_slave_driver || !sl) - return 0; + goto end; err = add_uevent_var(env, "W1_FID=%02X", sl->reg_num.family); if (err) - return err; + goto end; err = add_uevent_var(env, "W1_SLAVE_ID=%024LX", (unsigned long long)sl->reg_num.id); - if (err) - return err; - - return 0; -}; +end: + return err; +} #else static int w1_uevent(struct device *dev, struct kobj_uevent_env *env) { @@ -887,16 +885,21 @@ void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb * * Return 0 - device(s) present, 1 - no devices present. */ + mutex_lock(&dev->bus_mutex); if (w1_reset_bus(dev)) { + mutex_unlock(&dev->bus_mutex); dev_dbg(&dev->dev, "No devices present on the wire.\n"); break; } /* Do fast search on single slave bus */ if (dev->max_slave_count == 1) { + int rv; w1_write_8(dev, W1_READ_ROM); + rv = w1_read_block(dev, (u8 *)&rn, 8); + mutex_unlock(&dev->bus_mutex); - if (w1_read_block(dev, (u8 *)&rn, 8) == 8 && rn) + if (rv == 8 && rn) cb(dev, rn); break; @@ -929,10 +932,12 @@ void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb rn |= (tmp64 << i); if (kthread_should_stop()) { + mutex_unlock(&dev->bus_mutex); dev_dbg(&dev->dev, "Abort w1_search\n"); return; } } + mutex_unlock(&dev->bus_mutex); if ( (triplet_ret & 0x03) != 0x03 ) { if ( (desc_bit == last_zero) || (last_zero < 0)) diff --git a/drivers/w1/w1.h b/drivers/w1/w1.h index 4d012ca3f32c..45908e56c2f8 100644 --- a/drivers/w1/w1.h +++ b/drivers/w1/w1.h @@ -180,6 +180,7 @@ struct w1_master struct task_struct *thread; struct mutex mutex; + struct mutex bus_mutex; struct device_driver *driver; struct device dev; diff --git a/drivers/w1/w1_family.h b/drivers/w1/w1_family.h index 874aeb05011b..b00ada44a89b 100644 --- a/drivers/w1/w1_family.h +++ b/drivers/w1/w1_family.h @@ -30,6 +30,7 @@ #define W1_FAMILY_SMEM_01 0x01 #define W1_FAMILY_SMEM_81 0x81 #define W1_THERM_DS18S20 0x10 +#define W1_FAMILY_DS28E04 0x1C #define W1_COUNTER_DS2423 0x1D #define W1_THERM_DS1822 0x22 #define W1_EEPROM_DS2433 0x23 diff --git a/drivers/w1/w1_int.c b/drivers/w1/w1_int.c index 68288355727a..5a98649f6abc 100644 --- a/drivers/w1/w1_int.c +++ b/drivers/w1/w1_int.c @@ -76,6 +76,7 @@ static struct w1_master * w1_alloc_dev(u32 id, int slave_count, int slave_ttl, INIT_LIST_HEAD(&dev->slist); mutex_init(&dev->mutex); + mutex_init(&dev->bus_mutex); memcpy(&dev->dev, device, sizeof(struct device)); dev_set_name(&dev->dev, "w1_bus_master%u", dev->id); @@ -117,7 +118,7 @@ int w1_add_master_device(struct w1_bus_master *master) return(-EINVAL); } /* While it would be electrically possible to make a device that - * generated a strong pullup in bit bang mode, only hardare that + * generated a strong pullup in bit bang mode, only hardware that * controls 1-wire time frames are even expected to support a strong * pullup. w1_io.c would need to support calling set_pullup before * the last write_bit operation of a w1_write_8 which it currently |