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drivers: w1: Extend 1W master driver DS2482 with module option to support PPM/SPU/1WS features

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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 <amworsley@gmail.com>
Acked-by: Evgeniy Polyakov <zbr@ioremap.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andrew Worsley 2017-08-27 21:34:22 +10:00 • committed by Greg Kroah-Hartman
parent e5cf84e822
commit 54865314f5
1 changed files with 8 additions and 4 deletions

12
drivers/w1/masters/ds2482.c
View file

@ -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_PPM 0x02 /* presence pulse masking */
#define DS2482_REG_CFG_APU 0x01 /* active pull-up */ #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). * 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 the chip did reset since detect, re-config it */
if (err & DS2482_REG_STS_RST) if (err & DS2482_REG_STS_RST)
ds2482_send_cmd_data(pdev, DS2482_CMD_WRITE_CONFIG, ds2482_send_cmd_data(pdev, DS2482_CMD_WRITE_CONFIG,
ds2482_calculate_config(0x00)); ds2482_calculate_config(extra_config));
} }
mutex_unlock(&pdev->access_lock); mutex_unlock(&pdev->access_lock);
@ -429,8 +431,7 @@ static u8 ds2482_w1_set_pullup(void *data, int delay)
ds2482_wait_1wire_idle(pdev); ds2482_wait_1wire_idle(pdev);
/* note: it seems like both SPU and APU have to be set! */ /* note: it seems like both SPU and APU have to be set! */
retval = ds2482_send_cmd_data(pdev, DS2482_CMD_WRITE_CONFIG, retval = ds2482_send_cmd_data(pdev, DS2482_CMD_WRITE_CONFIG,
ds2482_calculate_config(DS2482_REG_CFG_SPU | ds2482_calculate_config(extra_config|DS2482_REG_CFG_SPU|DS2482_REG_CFG_APU));
DS2482_REG_CFG_APU));
ds2482_wait_1wire_idle(pdev); ds2482_wait_1wire_idle(pdev);
} }
@ -483,7 +484,7 @@ static int ds2482_probe(struct i2c_client *client,
/* Set all config items to 0 (off) */ /* Set all config items to 0 (off) */
ds2482_send_cmd_data(data, DS2482_CMD_WRITE_CONFIG, ds2482_send_cmd_data(data, DS2482_CMD_WRITE_CONFIG,
ds2482_calculate_config(0x00)); ds2482_calculate_config(extra_config));
mutex_init(&data->access_lock); mutex_init(&data->access_lock);
@ -558,4 +559,7 @@ module_i2c_driver(ds2482_driver);
MODULE_AUTHOR("Ben Gardner <bgardner@wabtec.com>"); MODULE_AUTHOR("Ben Gardner <bgardner@wabtec.com>");
MODULE_DESCRIPTION("DS2482 driver"); 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"); MODULE_LICENSE("GPL");