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-rw-r--r--drivers/w1/masters/omap_hdq.c28
-rw-r--r--drivers/w1/slaves/Kconfig11
-rw-r--r--drivers/w1/slaves/Makefile1
-rw-r--r--drivers/w1/slaves/w1_ds2423.c166
-rw-r--r--drivers/w1/w1_family.h1
5 files changed, 193 insertions, 14 deletions
diff --git a/drivers/w1/masters/omap_hdq.c b/drivers/w1/masters/omap_hdq.c
index 3a7e9ff8a74..38e96ab9094 100644
--- a/drivers/w1/masters/omap_hdq.c
+++ b/drivers/w1/masters/omap_hdq.c
@@ -593,19 +593,17 @@ static int __devinit omap_hdq_probe(struct platform_device *pdev)
/* get interface & functional clock objects */
hdq_data->hdq_ick = clk_get(&pdev->dev, "ick");
- hdq_data->hdq_fck = clk_get(&pdev->dev, "fck");
+ if (IS_ERR(hdq_data->hdq_ick)) {
+ dev_dbg(&pdev->dev, "Can't get HDQ ick clock object\n");
+ ret = PTR_ERR(hdq_data->hdq_ick);
+ goto err_ick;
+ }
- if (IS_ERR(hdq_data->hdq_ick) || IS_ERR(hdq_data->hdq_fck)) {
- dev_dbg(&pdev->dev, "Can't get HDQ clock objects\n");
- if (IS_ERR(hdq_data->hdq_ick)) {
- ret = PTR_ERR(hdq_data->hdq_ick);
- goto err_clk;
- }
- if (IS_ERR(hdq_data->hdq_fck)) {
- ret = PTR_ERR(hdq_data->hdq_fck);
- clk_put(hdq_data->hdq_ick);
- goto err_clk;
- }
+ hdq_data->hdq_fck = clk_get(&pdev->dev, "fck");
+ if (IS_ERR(hdq_data->hdq_fck)) {
+ dev_dbg(&pdev->dev, "Can't get HDQ fck clock object\n");
+ ret = PTR_ERR(hdq_data->hdq_fck);
+ goto err_fck;
}
hdq_data->hdq_usecount = 0;
@@ -665,10 +663,12 @@ err_fnclk:
clk_disable(hdq_data->hdq_ick);
err_intfclk:
- clk_put(hdq_data->hdq_ick);
clk_put(hdq_data->hdq_fck);
-err_clk:
+err_fck:
+ clk_put(hdq_data->hdq_ick);
+
+err_ick:
iounmap(hdq_data->hdq_base);
err_ioremap:
diff --git a/drivers/w1/slaves/Kconfig b/drivers/w1/slaves/Kconfig
index 1f51366417b..f0c909625bd 100644
--- a/drivers/w1/slaves/Kconfig
+++ b/drivers/w1/slaves/Kconfig
@@ -16,6 +16,17 @@ config W1_SLAVE_SMEM
Say Y here if you want to connect 1-wire
simple 64bit memory rom(ds2401/ds2411/ds1990*) to your wire.
+config W1_SLAVE_DS2423
+ tristate "Counter 1-wire device (DS2423)"
+ select CRC16
+ help
+ If you enable this you can read the counter values available
+ in the DS2423 chipset from the w1_slave file under the
+ sys file system.
+
+ Say Y here if you want to use a 1-wire
+ counter family device (DS2423).
+
config W1_SLAVE_DS2431
tristate "1kb EEPROM family support (DS2431)"
help
diff --git a/drivers/w1/slaves/Makefile b/drivers/w1/slaves/Makefile
index f1f51f19b12..3c76350a24f 100644
--- a/drivers/w1/slaves/Makefile
+++ b/drivers/w1/slaves/Makefile
@@ -4,6 +4,7 @@
obj-$(CONFIG_W1_SLAVE_THERM) += w1_therm.o
obj-$(CONFIG_W1_SLAVE_SMEM) += w1_smem.o
+obj-$(CONFIG_W1_SLAVE_DS2423) += w1_ds2423.o
obj-$(CONFIG_W1_SLAVE_DS2431) += w1_ds2431.o
obj-$(CONFIG_W1_SLAVE_DS2433) += w1_ds2433.o
obj-$(CONFIG_W1_SLAVE_DS2760) += w1_ds2760.o
diff --git a/drivers/w1/slaves/w1_ds2423.c b/drivers/w1/slaves/w1_ds2423.c
new file mode 100644
index 00000000000..7a7dbe5026f
--- /dev/null
+++ b/drivers/w1/slaves/w1_ds2423.c
@@ -0,0 +1,166 @@
+/*
+ * w1_ds2423.c
+ *
+ * Copyright (c) 2010 Mika Laitio <lamikr@pilppa.org>
+ *
+ * This driver will read and write the value of 4 counters to w1_slave file in
+ * sys filesystem.
+ * Inspired by the w1_therm and w1_ds2431 drivers.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the therms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#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/crc16.h>
+
+#include "../w1.h"
+#include "../w1_int.h"
+#include "../w1_family.h"
+
+#define CRC16_VALID 0xb001
+#define CRC16_INIT 0
+
+#define COUNTER_COUNT 4
+#define READ_BYTE_COUNT 42
+
+static ssize_t w1_counter_read(struct device *device,
+ struct device_attribute *attr, char *buf);
+
+static struct device_attribute w1_counter_attr =
+ __ATTR(w1_slave, S_IRUGO, w1_counter_read, NULL);
+
+static ssize_t w1_counter_read(struct device *device,
+ struct device_attribute *attr, char *out_buf)
+{
+ struct w1_slave *sl = dev_to_w1_slave(device);
+ struct w1_master *dev = sl->master;
+ u8 rbuf[COUNTER_COUNT * READ_BYTE_COUNT];
+ u8 wrbuf[3];
+ int rom_addr;
+ int read_byte_count;
+ int result;
+ ssize_t c;
+ int ii;
+ int p;
+ int crc;
+
+ c = PAGE_SIZE;
+ rom_addr = (12 << 5) + 31;
+ wrbuf[0] = 0xA5;
+ wrbuf[1] = rom_addr & 0xFF;
+ wrbuf[2] = rom_addr >> 8;
+ mutex_lock(&dev->mutex);
+ if (!w1_reset_select_slave(sl)) {
+ w1_write_block(dev, wrbuf, 3);
+ read_byte_count = 0;
+ for (p = 0; p < 4; p++) {
+ /*
+ * 1 byte for first bytes in ram page read
+ * 4 bytes for counter
+ * 4 bytes for zero bits
+ * 2 bytes for crc
+ * 31 remaining bytes from the ram page
+ */
+ read_byte_count += w1_read_block(dev,
+ rbuf + (p * READ_BYTE_COUNT), READ_BYTE_COUNT);
+ for (ii = 0; ii < READ_BYTE_COUNT; ++ii)
+ c -= snprintf(out_buf + PAGE_SIZE - c,
+ c, "%02x ",
+ rbuf[(p * READ_BYTE_COUNT) + ii]);
+ if (read_byte_count != (p + 1) * READ_BYTE_COUNT) {
+ dev_warn(device,
+ "w1_counter_read() returned %u bytes "
+ "instead of %d bytes wanted.\n",
+ read_byte_count,
+ READ_BYTE_COUNT);
+ c -= snprintf(out_buf + PAGE_SIZE - c,
+ c, "crc=NO\n");
+ } else {
+ if (p == 0) {
+ crc = crc16(CRC16_INIT, wrbuf, 3);
+ crc = crc16(crc, rbuf, 11);
+ } else {
+ /*
+ * DS2423 calculates crc from all bytes
+ * read after the previous crc bytes.
+ */
+ crc = crc16(CRC16_INIT,
+ (rbuf + 11) +
+ ((p - 1) * READ_BYTE_COUNT),
+ READ_BYTE_COUNT);
+ }
+ if (crc == CRC16_VALID) {
+ result = 0;
+ for (ii = 4; ii > 0; ii--) {
+ result <<= 8;
+ result |= rbuf[(p *
+ READ_BYTE_COUNT) + ii];
+ }
+ c -= snprintf(out_buf + PAGE_SIZE - c,
+ c, "crc=YES c=%d\n", result);
+ } else {
+ c -= snprintf(out_buf + PAGE_SIZE - c,
+ c, "crc=NO\n");
+ }
+ }
+ }
+ } else {
+ c -= snprintf(out_buf + PAGE_SIZE - c, c, "Connection error");
+ }
+ mutex_unlock(&dev->mutex);
+ return PAGE_SIZE - c;
+}
+
+static int w1_f1d_add_slave(struct w1_slave *sl)
+{
+ return device_create_file(&sl->dev, &w1_counter_attr);
+}
+
+static void w1_f1d_remove_slave(struct w1_slave *sl)
+{
+ device_remove_file(&sl->dev, &w1_counter_attr);
+}
+
+static struct w1_family_ops w1_f1d_fops = {
+ .add_slave = w1_f1d_add_slave,
+ .remove_slave = w1_f1d_remove_slave,
+};
+
+static struct w1_family w1_family_1d = {
+ .fid = W1_COUNTER_DS2423,
+ .fops = &w1_f1d_fops,
+};
+
+static int __init w1_f1d_init(void)
+{
+ return w1_register_family(&w1_family_1d);
+}
+
+static void __exit w1_f1d_exit(void)
+{
+ w1_unregister_family(&w1_family_1d);
+}
+
+module_init(w1_f1d_init);
+module_exit(w1_f1d_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Mika Laitio <lamikr@pilppa.org>");
+MODULE_DESCRIPTION("w1 family 1d driver for DS2423, 4 counters and 4kb ram");
diff --git a/drivers/w1/w1_family.h b/drivers/w1/w1_family.h
index 3ca1b9298f2..f3b636d7caf 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_COUNTER_DS2423 0x1D
#define W1_THERM_DS1822 0x22
#define W1_EEPROM_DS2433 0x23
#define W1_THERM_DS18B20 0x28
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-22 21:01:39 +0000