diff options
| -rw-r--r-- | drivers/regulator/Kconfig | 11 | ||||
| -rw-r--r-- | drivers/regulator/Makefile | 1 | ||||
| -rw-r--r-- | drivers/regulator/core.c | 27 | ||||
| -rw-r--r-- | drivers/regulator/dummy.c | 66 | ||||
| -rw-r--r-- | drivers/regulator/dummy.h | 31 |
5 files changed, 135 insertions, 1 deletions
diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig index 3c07169498cf..834b48441829 100644 --- a/drivers/regulator/Kconfig +++ b/drivers/regulator/Kconfig @@ -27,6 +27,17 @@ config REGULATOR_DEBUG help Say yes here to enable debugging support. +config REGULATOR_DUMMY + bool "Provide a dummy regulator if regulator lookups fail" + help + If this option is enabled then when a regulator lookup fails + and the board has not specified that it has provided full + constraints then the regulator core will provide an always + enabled dummy regulator will be provided, allowing consumer + drivers to continue. + + A warning will be generated when this substitution is done. + config REGULATOR_FIXED_VOLTAGE tristate "Fixed voltage regulator support" help diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile index 7c59bcb10613..e845b66ad59c 100644 --- a/drivers/regulator/Makefile +++ b/drivers/regulator/Makefile @@ -9,6 +9,7 @@ obj-$(CONFIG_REGULATOR_VIRTUAL_CONSUMER) += virtual.o obj-$(CONFIG_REGULATOR_USERSPACE_CONSUMER) += userspace-consumer.o obj-$(CONFIG_REGULATOR_BQ24022) += bq24022.o +obj-$(CONFIG_REGULATOR_DUMMY) += dummy.o obj-$(CONFIG_REGULATOR_LP3971) += lp3971.o obj-$(CONFIG_REGULATOR_MAX1586) += max1586.o obj-$(CONFIG_REGULATOR_TWL4030) += twl-regulator.o diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index 75a26f780918..c7bbe30010f7 100644 --- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -24,6 +24,8 @@ #include <linux/regulator/driver.h> #include <linux/regulator/machine.h> +#include "dummy.h" + #define REGULATOR_VERSION "0.5" static DEFINE_MUTEX(regulator_list_mutex); @@ -1123,6 +1125,22 @@ static struct regulator *_regulator_get(struct device *dev, const char *id, goto found; } } + +#ifdef CONFIG_REGULATOR_DUMMY + if (!devname) + devname = "deviceless"; + + /* If the board didn't flag that it was fully constrained then + * substitute in a dummy regulator so consumers can continue. + */ + if (!has_full_constraints) { + pr_warning("%s supply %s not found, using dummy regulator\n", + devname, id); + rdev = dummy_regulator_rdev; + goto found; + } +#endif + mutex_unlock(®ulator_list_mutex); return regulator; @@ -2483,8 +2501,15 @@ EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); static int __init regulator_init(void) { + int ret; + printk(KERN_INFO "regulator: core version %s\n", REGULATOR_VERSION); - return class_register(®ulator_class); + + ret = class_register(®ulator_class); + + regulator_dummy_init(); + + return ret; } /* init early to allow our consumers to complete system booting */ diff --git a/drivers/regulator/dummy.c b/drivers/regulator/dummy.c new file mode 100644 index 000000000000..c7410bde7b5d --- /dev/null +++ b/drivers/regulator/dummy.c @@ -0,0 +1,66 @@ +/* + * dummy.c + * + * Copyright 2010 Wolfson Microelectronics PLC. + * + * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> + * + * 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; either version 2 of the + * License, or (at your option) any later version. + * + * This is useful for systems with mixed controllable and + * non-controllable regulators, as well as for allowing testing on + * systems with no controllable regulators. + */ + +#include <linux/err.h> +#include <linux/platform_device.h> +#include <linux/regulator/driver.h> +#include <linux/regulator/machine.h> + +#include "dummy.h" + +struct regulator_dev *dummy_regulator_rdev; + +static struct regulator_init_data dummy_initdata; + +static struct regulator_ops dummy_ops; + +static struct regulator_desc dummy_desc = { + .name = "dummy", + .id = -1, + .type = REGULATOR_VOLTAGE, + .owner = THIS_MODULE, + .ops = &dummy_ops, +}; + +static struct platform_device *dummy_pdev; + +void __init regulator_dummy_init(void) +{ + int ret; + + dummy_pdev = platform_device_alloc("reg-dummy", -1); + if (!dummy_pdev) { + pr_err("Failed to allocate dummy regulator device\n"); + return; + } + + ret = platform_device_add(dummy_pdev); + if (ret != 0) { + pr_err("Failed to register dummy regulator device: %d\n", ret); + platform_device_put(dummy_pdev); + return; + } + + dummy_regulator_rdev = regulator_register(&dummy_desc, NULL, + &dummy_initdata, NULL); + if (IS_ERR(dummy_regulator_rdev)) { + ret = PTR_ERR(dummy_regulator_rdev); + pr_err("Failed to register regulator: %d\n", ret); + platform_device_unregister(dummy_pdev); + return; + } +} diff --git a/drivers/regulator/dummy.h b/drivers/regulator/dummy.h new file mode 100644 index 000000000000..3921c0e24249 --- /dev/null +++ b/drivers/regulator/dummy.h @@ -0,0 +1,31 @@ +/* + * dummy.h + * + * Copyright 2010 Wolfson Microelectronics PLC. + * + * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> + * + * 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; either version 2 of the + * License, or (at your option) any later version. + * + * This is useful for systems with mixed controllable and + * non-controllable regulators, as well as for allowing testing on + * systems with no controllable regulators. + */ + +#ifndef _DUMMY_H +#define _DUMMY_H + +struct regulator_dev; + +extern struct regulator_dev *dummy_regulator_rdev; + +#ifdef CONFIG_REGULATOR_DUMMY +void __init regulator_dummy_init(void); +#else +static inline void regulator_dummy_init(void) { } +#endif + +#endif |