diff options
Diffstat (limited to 'drivers/w1/masters/ds2482.c')
| -rw-r--r-- | drivers/w1/masters/ds2482.c | 23 |
1 files changed, 12 insertions, 11 deletions
diff --git a/drivers/w1/masters/ds2482.c b/drivers/w1/masters/ds2482.c index 8b5e598ffdb3..b471779c3e2c 100644 --- a/drivers/w1/masters/ds2482.c +++ b/drivers/w1/masters/ds2482.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0-only /** * ds2482.c - provides i2c to w1-master bridge(s) * Copyright (C) 2005 Ben Gardner <bgardner@wabtec.com> @@ -7,10 +8,6 @@ * There are two variations: -100 and -800, which have 1 or 8 1-wire ports. * The complete datasheet can be obtained from MAXIM's website at: * http://www.maxim-ic.com/quick_view2.cfm/qv_pk/4382 - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; version 2 of the License. */ #include <linux/module.h> @@ -37,6 +34,11 @@ module_param_named(active_pullup, ds2482_active_pullup, int, 0644); MODULE_PARM_DESC(active_pullup, "Active pullup (apply to all buses): " \ "0-disable, 1-enable (default)"); +/* extra configurations - e.g. 1WS */ +static int extra_config; +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"); + /** * The DS2482 registers - there are 3 registers that are addressed by a read * pointer. The read pointer is set by the last command executed. @@ -70,8 +72,6 @@ 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 */ -static int extra_config; /** * Write and verify codes for the CHANNEL_SELECT command (DS2482-800 only). @@ -130,6 +130,8 @@ struct ds2482_data { */ static inline u8 ds2482_calculate_config(u8 conf) { + conf |= extra_config; + if (ds2482_active_pullup) conf |= DS2482_REG_CFG_APU; @@ -405,7 +407,7 @@ 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(extra_config)); + ds2482_calculate_config(0x00)); } mutex_unlock(&pdev->access_lock); @@ -431,7 +433,8 @@ 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(extra_config|DS2482_REG_CFG_SPU|DS2482_REG_CFG_APU)); + ds2482_calculate_config(DS2482_REG_CFG_SPU | + DS2482_REG_CFG_APU)); ds2482_wait_1wire_idle(pdev); } @@ -484,7 +487,7 @@ 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(extra_config)); + ds2482_calculate_config(0x00)); mutex_init(&data->access_lock); @@ -559,7 +562,5 @@ module_i2c_driver(ds2482_driver); MODULE_AUTHOR("Ben Gardner <bgardner@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"); |