Extend the one wire DS2482 master driver with a module option that allows
support
for PPM/SPU/1WS interface modes to be requested. This allows support of chips
that require one or more of these features such as the DS28E05.
Signed-off-by: Andrew Worsley <amwors...@gmail.com>
Acked-by: Evgeniy Polyakov <z...@ioremap.net>
---
drivers/w1/masters/ds2482.c | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)
diff --git a/drivers/w1/masters/ds2482.c b/drivers/w1/masters/ds2482.c
index d49681cd29af..5b3e017d9276 100644
--- a/drivers/w1/masters/ds2482.c
+++ b/drivers/w1/masters/ds2482.c
@@ -70,6 +70,8 @@ MODULE_PARM_DESC(active_pullup, "Active pullup (apply to all
buses): " \
#define DS2482_REG_CFG_PPM 0x02 /* presence pulse masking */
#define DS2482_REG_CFG_APU 0x01 /* active pull-up */
+/* extra configurations - e.g. 1WS */
+int extra_config;
/**
* Write and verify codes for the CHANNEL_SELECT command (DS2482-800 only).
@@ -403,7 +405,7 @@ static u8 ds2482_w1_reset_bus(void *data)
/* If the chip did reset since detect, re-config it */
if (err & DS2482_REG_STS_RST)
ds2482_send_cmd_data(pdev, DS2482_CMD_WRITE_CONFIG,
- ds2482_calculate_config(0x00));
+ ds2482_calculate_config(extra_config));
}
mutex_unlock(&pdev->access_lock);
@@ -429,8 +431,7 @@ static u8 ds2482_w1_set_pullup(void *data, int delay)
ds2482_wait_1wire_idle(pdev);
/* note: it seems like both SPU and APU have to be set! */
retval = ds2482_send_cmd_data(pdev, DS2482_CMD_WRITE_CONFIG,
- ds2482_calculate_config(DS2482_REG_CFG_SPU |
- DS2482_REG_CFG_APU));
+
ds2482_calculate_config(extra_config|DS2482_REG_CFG_SPU|DS2482_REG_CFG_APU));
ds2482_wait_1wire_idle(pdev);
}
@@ -483,7 +484,7 @@ static int ds2482_probe(struct i2c_client *client,
/* Set all config items to 0 (off) */
ds2482_send_cmd_data(data, DS2482_CMD_WRITE_CONFIG,
- ds2482_calculate_config(0x00));
+ ds2482_calculate_config(extra_config));
mutex_init(&data->access_lock);
@@ -558,4 +559,7 @@ module_i2c_driver(ds2482_driver);
MODULE_AUTHOR("Ben Gardner <bgard...@wabtec.com>");
MODULE_DESCRIPTION("DS2482 driver");
+module_param(extra_config, int, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(extra_config, "Extra Configuration settings
1=APU,2=PPM,3=SPU,8=1WS");
+
MODULE_LICENSE("GPL");
--
2.11.0
