regulator: Add driver for gpio-controlled regulators
This patch adds support for regulators that can be controlled via gpios.
Examples for such regulators are the TI-tps65024x voltage regulators
with 4 fixed and 1 runtime-switchable voltage regulators
or the TI-bq240XX charger regulators.
The number of controlling gpios is not limited, the mapping between
voltage/current and target gpio state is done via the states map
and the driver can be used for either voltage or current regulators.
A mapping for a regulator with two GPIOs could look like:
gpios = {
{ .gpio = GPIO1, .flags = GPIOF_OUT_INIT_HIGH, .label = "gpio name 1" },
{ .gpio = GPIO2, .flags = GPIOF_OUT_INIT_LOW, .label = "gpio name 2" },
}
The flags element of the gpios array determines the initial state of
the gpio, set during probe. The initial state of the regulator is also
calculated from these values
states = {
{ .value = volt_or_cur1, .gpios = (0 << 1) | (0 << 0) },
{ .value = volt_or_cur2, .gpios = (0 << 1) | (1 << 0) },
{ .value = volt_or_cur3, .gpios = (1 << 1) | (0 << 0) },
{ .value = volt_or_cur4, .gpios = (1 << 1) | (1 << 0) },
}
The target-state for the n-th gpio is determined by the n-th bit
in the bitfield of the target-value.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2011-10-05 18:27:05 +08:00
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/*
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* gpio-regulator.c
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*
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* Copyright 2011 Heiko Stuebner <heiko@sntech.de>
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*
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* based on fixed.c
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*
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* Copyright 2008 Wolfson Microelectronics PLC.
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*
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* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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*
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* Copyright (c) 2009 Nokia Corporation
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* Roger Quadros <ext-roger.quadros@nokia.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This is useful for systems with mixed controllable and
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* non-controllable regulators, as well as for allowing testing on
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* systems with no controllable regulators.
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*/
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#include <linux/err.h>
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#include <linux/mutex.h>
|
2011-10-11 20:59:13 +08:00
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#include <linux/module.h>
|
regulator: Add driver for gpio-controlled regulators
This patch adds support for regulators that can be controlled via gpios.
Examples for such regulators are the TI-tps65024x voltage regulators
with 4 fixed and 1 runtime-switchable voltage regulators
or the TI-bq240XX charger regulators.
The number of controlling gpios is not limited, the mapping between
voltage/current and target gpio state is done via the states map
and the driver can be used for either voltage or current regulators.
A mapping for a regulator with two GPIOs could look like:
gpios = {
{ .gpio = GPIO1, .flags = GPIOF_OUT_INIT_HIGH, .label = "gpio name 1" },
{ .gpio = GPIO2, .flags = GPIOF_OUT_INIT_LOW, .label = "gpio name 2" },
}
The flags element of the gpios array determines the initial state of
the gpio, set during probe. The initial state of the regulator is also
calculated from these values
states = {
{ .value = volt_or_cur1, .gpios = (0 << 1) | (0 << 0) },
{ .value = volt_or_cur2, .gpios = (0 << 1) | (1 << 0) },
{ .value = volt_or_cur3, .gpios = (1 << 1) | (0 << 0) },
{ .value = volt_or_cur4, .gpios = (1 << 1) | (1 << 0) },
}
The target-state for the n-th gpio is determined by the n-th bit
in the bitfield of the target-value.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2011-10-05 18:27:05 +08:00
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#include <linux/platform_device.h>
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#include <linux/regulator/driver.h>
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#include <linux/regulator/machine.h>
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2012-10-15 21:16:59 +08:00
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#include <linux/regulator/of_regulator.h>
|
regulator: Add driver for gpio-controlled regulators
This patch adds support for regulators that can be controlled via gpios.
Examples for such regulators are the TI-tps65024x voltage regulators
with 4 fixed and 1 runtime-switchable voltage regulators
or the TI-bq240XX charger regulators.
The number of controlling gpios is not limited, the mapping between
voltage/current and target gpio state is done via the states map
and the driver can be used for either voltage or current regulators.
A mapping for a regulator with two GPIOs could look like:
gpios = {
{ .gpio = GPIO1, .flags = GPIOF_OUT_INIT_HIGH, .label = "gpio name 1" },
{ .gpio = GPIO2, .flags = GPIOF_OUT_INIT_LOW, .label = "gpio name 2" },
}
The flags element of the gpios array determines the initial state of
the gpio, set during probe. The initial state of the regulator is also
calculated from these values
states = {
{ .value = volt_or_cur1, .gpios = (0 << 1) | (0 << 0) },
{ .value = volt_or_cur2, .gpios = (0 << 1) | (1 << 0) },
{ .value = volt_or_cur3, .gpios = (1 << 1) | (0 << 0) },
{ .value = volt_or_cur4, .gpios = (1 << 1) | (1 << 0) },
}
The target-state for the n-th gpio is determined by the n-th bit
in the bitfield of the target-value.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2011-10-05 18:27:05 +08:00
|
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#include <linux/regulator/gpio-regulator.h>
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#include <linux/gpio.h>
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#include <linux/slab.h>
|
2012-10-15 21:16:59 +08:00
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#include <linux/of.h>
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#include <linux/of_gpio.h>
|
regulator: Add driver for gpio-controlled regulators
This patch adds support for regulators that can be controlled via gpios.
Examples for such regulators are the TI-tps65024x voltage regulators
with 4 fixed and 1 runtime-switchable voltage regulators
or the TI-bq240XX charger regulators.
The number of controlling gpios is not limited, the mapping between
voltage/current and target gpio state is done via the states map
and the driver can be used for either voltage or current regulators.
A mapping for a regulator with two GPIOs could look like:
gpios = {
{ .gpio = GPIO1, .flags = GPIOF_OUT_INIT_HIGH, .label = "gpio name 1" },
{ .gpio = GPIO2, .flags = GPIOF_OUT_INIT_LOW, .label = "gpio name 2" },
}
The flags element of the gpios array determines the initial state of
the gpio, set during probe. The initial state of the regulator is also
calculated from these values
states = {
{ .value = volt_or_cur1, .gpios = (0 << 1) | (0 << 0) },
{ .value = volt_or_cur2, .gpios = (0 << 1) | (1 << 0) },
{ .value = volt_or_cur3, .gpios = (1 << 1) | (0 << 0) },
{ .value = volt_or_cur4, .gpios = (1 << 1) | (1 << 0) },
}
The target-state for the n-th gpio is determined by the n-th bit
in the bitfield of the target-value.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2011-10-05 18:27:05 +08:00
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struct gpio_regulator_data {
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struct regulator_desc desc;
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struct regulator_dev *dev;
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struct gpio *gpios;
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int nr_gpios;
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struct gpio_regulator_state *states;
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int nr_states;
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int state;
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};
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static int gpio_regulator_get_value(struct regulator_dev *dev)
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{
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struct gpio_regulator_data *data = rdev_get_drvdata(dev);
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int ptr;
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for (ptr = 0; ptr < data->nr_states; ptr++)
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if (data->states[ptr].gpios == data->state)
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return data->states[ptr].value;
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return -EINVAL;
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}
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2012-08-08 06:50:19 +08:00
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static int gpio_regulator_set_voltage(struct regulator_dev *dev,
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int min_uV, int max_uV,
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unsigned *selector)
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regulator: Add driver for gpio-controlled regulators
This patch adds support for regulators that can be controlled via gpios.
Examples for such regulators are the TI-tps65024x voltage regulators
with 4 fixed and 1 runtime-switchable voltage regulators
or the TI-bq240XX charger regulators.
The number of controlling gpios is not limited, the mapping between
voltage/current and target gpio state is done via the states map
and the driver can be used for either voltage or current regulators.
A mapping for a regulator with two GPIOs could look like:
gpios = {
{ .gpio = GPIO1, .flags = GPIOF_OUT_INIT_HIGH, .label = "gpio name 1" },
{ .gpio = GPIO2, .flags = GPIOF_OUT_INIT_LOW, .label = "gpio name 2" },
}
The flags element of the gpios array determines the initial state of
the gpio, set during probe. The initial state of the regulator is also
calculated from these values
states = {
{ .value = volt_or_cur1, .gpios = (0 << 1) | (0 << 0) },
{ .value = volt_or_cur2, .gpios = (0 << 1) | (1 << 0) },
{ .value = volt_or_cur3, .gpios = (1 << 1) | (0 << 0) },
{ .value = volt_or_cur4, .gpios = (1 << 1) | (1 << 0) },
}
The target-state for the n-th gpio is determined by the n-th bit
in the bitfield of the target-value.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2011-10-05 18:27:05 +08:00
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{
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struct gpio_regulator_data *data = rdev_get_drvdata(dev);
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2012-06-04 03:31:09 +08:00
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int ptr, target = 0, state, best_val = INT_MAX;
|
regulator: Add driver for gpio-controlled regulators
This patch adds support for regulators that can be controlled via gpios.
Examples for such regulators are the TI-tps65024x voltage regulators
with 4 fixed and 1 runtime-switchable voltage regulators
or the TI-bq240XX charger regulators.
The number of controlling gpios is not limited, the mapping between
voltage/current and target gpio state is done via the states map
and the driver can be used for either voltage or current regulators.
A mapping for a regulator with two GPIOs could look like:
gpios = {
{ .gpio = GPIO1, .flags = GPIOF_OUT_INIT_HIGH, .label = "gpio name 1" },
{ .gpio = GPIO2, .flags = GPIOF_OUT_INIT_LOW, .label = "gpio name 2" },
}
The flags element of the gpios array determines the initial state of
the gpio, set during probe. The initial state of the regulator is also
calculated from these values
states = {
{ .value = volt_or_cur1, .gpios = (0 << 1) | (0 << 0) },
{ .value = volt_or_cur2, .gpios = (0 << 1) | (1 << 0) },
{ .value = volt_or_cur3, .gpios = (1 << 1) | (0 << 0) },
{ .value = volt_or_cur4, .gpios = (1 << 1) | (1 << 0) },
}
The target-state for the n-th gpio is determined by the n-th bit
in the bitfield of the target-value.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2011-10-05 18:27:05 +08:00
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for (ptr = 0; ptr < data->nr_states; ptr++)
|
2012-03-22 14:08:04 +08:00
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if (data->states[ptr].value < best_val &&
|
2012-08-08 06:50:19 +08:00
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data->states[ptr].value >= min_uV &&
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data->states[ptr].value <= max_uV) {
|
regulator: Add driver for gpio-controlled regulators
This patch adds support for regulators that can be controlled via gpios.
Examples for such regulators are the TI-tps65024x voltage regulators
with 4 fixed and 1 runtime-switchable voltage regulators
or the TI-bq240XX charger regulators.
The number of controlling gpios is not limited, the mapping between
voltage/current and target gpio state is done via the states map
and the driver can be used for either voltage or current regulators.
A mapping for a regulator with two GPIOs could look like:
gpios = {
{ .gpio = GPIO1, .flags = GPIOF_OUT_INIT_HIGH, .label = "gpio name 1" },
{ .gpio = GPIO2, .flags = GPIOF_OUT_INIT_LOW, .label = "gpio name 2" },
}
The flags element of the gpios array determines the initial state of
the gpio, set during probe. The initial state of the regulator is also
calculated from these values
states = {
{ .value = volt_or_cur1, .gpios = (0 << 1) | (0 << 0) },
{ .value = volt_or_cur2, .gpios = (0 << 1) | (1 << 0) },
{ .value = volt_or_cur3, .gpios = (1 << 1) | (0 << 0) },
{ .value = volt_or_cur4, .gpios = (1 << 1) | (1 << 0) },
}
The target-state for the n-th gpio is determined by the n-th bit
in the bitfield of the target-value.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2011-10-05 18:27:05 +08:00
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target = data->states[ptr].gpios;
|
2012-06-04 03:31:09 +08:00
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best_val = data->states[ptr].value;
|
2012-06-04 03:32:05 +08:00
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if (selector)
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*selector = ptr;
|
2012-06-04 03:31:09 +08:00
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}
|
regulator: Add driver for gpio-controlled regulators
This patch adds support for regulators that can be controlled via gpios.
Examples for such regulators are the TI-tps65024x voltage regulators
with 4 fixed and 1 runtime-switchable voltage regulators
or the TI-bq240XX charger regulators.
The number of controlling gpios is not limited, the mapping between
voltage/current and target gpio state is done via the states map
and the driver can be used for either voltage or current regulators.
A mapping for a regulator with two GPIOs could look like:
gpios = {
{ .gpio = GPIO1, .flags = GPIOF_OUT_INIT_HIGH, .label = "gpio name 1" },
{ .gpio = GPIO2, .flags = GPIOF_OUT_INIT_LOW, .label = "gpio name 2" },
}
The flags element of the gpios array determines the initial state of
the gpio, set during probe. The initial state of the regulator is also
calculated from these values
states = {
{ .value = volt_or_cur1, .gpios = (0 << 1) | (0 << 0) },
{ .value = volt_or_cur2, .gpios = (0 << 1) | (1 << 0) },
{ .value = volt_or_cur3, .gpios = (1 << 1) | (0 << 0) },
{ .value = volt_or_cur4, .gpios = (1 << 1) | (1 << 0) },
}
The target-state for the n-th gpio is determined by the n-th bit
in the bitfield of the target-value.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2011-10-05 18:27:05 +08:00
|
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|
2012-03-22 14:08:04 +08:00
|
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if (best_val == INT_MAX)
|
regulator: Add driver for gpio-controlled regulators
This patch adds support for regulators that can be controlled via gpios.
Examples for such regulators are the TI-tps65024x voltage regulators
with 4 fixed and 1 runtime-switchable voltage regulators
or the TI-bq240XX charger regulators.
The number of controlling gpios is not limited, the mapping between
voltage/current and target gpio state is done via the states map
and the driver can be used for either voltage or current regulators.
A mapping for a regulator with two GPIOs could look like:
gpios = {
{ .gpio = GPIO1, .flags = GPIOF_OUT_INIT_HIGH, .label = "gpio name 1" },
{ .gpio = GPIO2, .flags = GPIOF_OUT_INIT_LOW, .label = "gpio name 2" },
}
The flags element of the gpios array determines the initial state of
the gpio, set during probe. The initial state of the regulator is also
calculated from these values
states = {
{ .value = volt_or_cur1, .gpios = (0 << 1) | (0 << 0) },
{ .value = volt_or_cur2, .gpios = (0 << 1) | (1 << 0) },
{ .value = volt_or_cur3, .gpios = (1 << 1) | (0 << 0) },
{ .value = volt_or_cur4, .gpios = (1 << 1) | (1 << 0) },
}
The target-state for the n-th gpio is determined by the n-th bit
in the bitfield of the target-value.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2011-10-05 18:27:05 +08:00
|
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return -EINVAL;
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for (ptr = 0; ptr < data->nr_gpios; ptr++) {
|
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state = (target & (1 << ptr)) >> ptr;
|
2012-12-10 16:55:53 +08:00
|
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gpio_set_value_cansleep(data->gpios[ptr].gpio, state);
|
regulator: Add driver for gpio-controlled regulators
This patch adds support for regulators that can be controlled via gpios.
Examples for such regulators are the TI-tps65024x voltage regulators
with 4 fixed and 1 runtime-switchable voltage regulators
or the TI-bq240XX charger regulators.
The number of controlling gpios is not limited, the mapping between
voltage/current and target gpio state is done via the states map
and the driver can be used for either voltage or current regulators.
A mapping for a regulator with two GPIOs could look like:
gpios = {
{ .gpio = GPIO1, .flags = GPIOF_OUT_INIT_HIGH, .label = "gpio name 1" },
{ .gpio = GPIO2, .flags = GPIOF_OUT_INIT_LOW, .label = "gpio name 2" },
}
The flags element of the gpios array determines the initial state of
the gpio, set during probe. The initial state of the regulator is also
calculated from these values
states = {
{ .value = volt_or_cur1, .gpios = (0 << 1) | (0 << 0) },
{ .value = volt_or_cur2, .gpios = (0 << 1) | (1 << 0) },
{ .value = volt_or_cur3, .gpios = (1 << 1) | (0 << 0) },
{ .value = volt_or_cur4, .gpios = (1 << 1) | (1 << 0) },
}
The target-state for the n-th gpio is determined by the n-th bit
in the bitfield of the target-value.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2011-10-05 18:27:05 +08:00
|
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}
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data->state = target;
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return 0;
|
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}
|
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static int gpio_regulator_list_voltage(struct regulator_dev *dev,
|
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unsigned selector)
|
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|
{
|
|
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|
struct gpio_regulator_data *data = rdev_get_drvdata(dev);
|
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if (selector >= data->nr_states)
|
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|
|
return -EINVAL;
|
|
|
|
|
|
|
|
return data->states[selector].value;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int gpio_regulator_set_current_limit(struct regulator_dev *dev,
|
|
|
|
int min_uA, int max_uA)
|
|
|
|
{
|
2012-08-08 06:50:19 +08:00
|
|
|
struct gpio_regulator_data *data = rdev_get_drvdata(dev);
|
|
|
|
int ptr, target = 0, state, best_val = 0;
|
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|
|
|
|
|
|
for (ptr = 0; ptr < data->nr_states; ptr++)
|
|
|
|
if (data->states[ptr].value > best_val &&
|
|
|
|
data->states[ptr].value >= min_uA &&
|
|
|
|
data->states[ptr].value <= max_uA) {
|
|
|
|
target = data->states[ptr].gpios;
|
|
|
|
best_val = data->states[ptr].value;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (best_val == 0)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
for (ptr = 0; ptr < data->nr_gpios; ptr++) {
|
|
|
|
state = (target & (1 << ptr)) >> ptr;
|
2012-12-10 16:55:53 +08:00
|
|
|
gpio_set_value_cansleep(data->gpios[ptr].gpio, state);
|
2012-08-08 06:50:19 +08:00
|
|
|
}
|
|
|
|
data->state = target;
|
|
|
|
|
|
|
|
return 0;
|
regulator: Add driver for gpio-controlled regulators
This patch adds support for regulators that can be controlled via gpios.
Examples for such regulators are the TI-tps65024x voltage regulators
with 4 fixed and 1 runtime-switchable voltage regulators
or the TI-bq240XX charger regulators.
The number of controlling gpios is not limited, the mapping between
voltage/current and target gpio state is done via the states map
and the driver can be used for either voltage or current regulators.
A mapping for a regulator with two GPIOs could look like:
gpios = {
{ .gpio = GPIO1, .flags = GPIOF_OUT_INIT_HIGH, .label = "gpio name 1" },
{ .gpio = GPIO2, .flags = GPIOF_OUT_INIT_LOW, .label = "gpio name 2" },
}
The flags element of the gpios array determines the initial state of
the gpio, set during probe. The initial state of the regulator is also
calculated from these values
states = {
{ .value = volt_or_cur1, .gpios = (0 << 1) | (0 << 0) },
{ .value = volt_or_cur2, .gpios = (0 << 1) | (1 << 0) },
{ .value = volt_or_cur3, .gpios = (1 << 1) | (0 << 0) },
{ .value = volt_or_cur4, .gpios = (1 << 1) | (1 << 0) },
}
The target-state for the n-th gpio is determined by the n-th bit
in the bitfield of the target-value.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2011-10-05 18:27:05 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
static struct regulator_ops gpio_regulator_voltage_ops = {
|
|
|
|
.get_voltage = gpio_regulator_get_value,
|
|
|
|
.set_voltage = gpio_regulator_set_voltage,
|
|
|
|
.list_voltage = gpio_regulator_list_voltage,
|
|
|
|
};
|
|
|
|
|
2013-01-28 22:17:46 +08:00
|
|
|
static struct gpio_regulator_config *
|
2012-10-15 21:16:59 +08:00
|
|
|
of_get_gpio_regulator_config(struct device *dev, struct device_node *np)
|
|
|
|
{
|
|
|
|
struct gpio_regulator_config *config;
|
|
|
|
const char *regtype;
|
|
|
|
int proplen, gpio, i;
|
2013-11-09 20:12:28 +08:00
|
|
|
int ret;
|
2012-10-15 21:16:59 +08:00
|
|
|
|
|
|
|
config = devm_kzalloc(dev,
|
|
|
|
sizeof(struct gpio_regulator_config),
|
|
|
|
GFP_KERNEL);
|
|
|
|
if (!config)
|
|
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
|
|
|
|
config->init_data = of_get_regulator_init_data(dev, np);
|
|
|
|
if (!config->init_data)
|
|
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
|
|
|
|
config->supply_name = config->init_data->constraints.name;
|
|
|
|
|
|
|
|
if (of_property_read_bool(np, "enable-active-high"))
|
|
|
|
config->enable_high = true;
|
|
|
|
|
|
|
|
if (of_property_read_bool(np, "enable-at-boot"))
|
|
|
|
config->enabled_at_boot = true;
|
|
|
|
|
|
|
|
of_property_read_u32(np, "startup-delay-us", &config->startup_delay);
|
|
|
|
|
|
|
|
config->enable_gpio = of_get_named_gpio(np, "enable-gpio", 0);
|
|
|
|
|
|
|
|
/* Fetch GPIOs. */
|
2013-01-28 22:16:03 +08:00
|
|
|
config->nr_gpios = of_gpio_count(np);
|
2012-10-15 21:16:59 +08:00
|
|
|
|
|
|
|
config->gpios = devm_kzalloc(dev,
|
|
|
|
sizeof(struct gpio) * config->nr_gpios,
|
|
|
|
GFP_KERNEL);
|
|
|
|
if (!config->gpios)
|
|
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
|
2014-02-13 23:34:32 +08:00
|
|
|
proplen = of_property_count_u32_elems(np, "gpios-states");
|
|
|
|
/* optional property */
|
|
|
|
if (proplen < 0)
|
|
|
|
proplen = 0;
|
|
|
|
|
|
|
|
if (proplen > 0 && proplen != config->nr_gpios) {
|
|
|
|
dev_warn(dev, "gpios <-> gpios-states mismatch\n");
|
|
|
|
proplen = 0;
|
2014-01-31 13:25:14 +08:00
|
|
|
}
|
|
|
|
|
2012-12-10 16:55:52 +08:00
|
|
|
for (i = 0; i < config->nr_gpios; i++) {
|
2012-10-15 21:16:59 +08:00
|
|
|
gpio = of_get_named_gpio(np, "gpios", i);
|
|
|
|
if (gpio < 0)
|
|
|
|
break;
|
|
|
|
config->gpios[i].gpio = gpio;
|
2014-02-13 23:34:32 +08:00
|
|
|
if (proplen > 0) {
|
|
|
|
of_property_read_u32_index(np, "gpios-states", i, &ret);
|
|
|
|
if (ret)
|
|
|
|
config->gpios[i].flags = GPIOF_OUT_INIT_HIGH;
|
|
|
|
}
|
2012-10-15 21:16:59 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
/* Fetch states. */
|
2014-02-12 08:01:08 +08:00
|
|
|
proplen = of_property_count_u32_elems(np, "states");
|
|
|
|
if (proplen < 0) {
|
2012-11-14 19:51:36 +08:00
|
|
|
dev_err(dev, "No 'states' property found\n");
|
|
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
}
|
|
|
|
|
2012-10-15 21:16:59 +08:00
|
|
|
config->states = devm_kzalloc(dev,
|
|
|
|
sizeof(struct gpio_regulator_state)
|
|
|
|
* (proplen / 2),
|
|
|
|
GFP_KERNEL);
|
|
|
|
if (!config->states)
|
|
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
|
|
|
|
for (i = 0; i < proplen / 2; i++) {
|
2014-02-12 08:01:08 +08:00
|
|
|
of_property_read_u32_index(np, "states", i * 2,
|
|
|
|
&config->states[i].value);
|
|
|
|
of_property_read_u32_index(np, "states", i * 2 + 1,
|
|
|
|
&config->states[i].gpios);
|
2012-10-15 21:16:59 +08:00
|
|
|
}
|
|
|
|
config->nr_states = i;
|
|
|
|
|
2013-12-05 08:29:57 +08:00
|
|
|
config->type = REGULATOR_VOLTAGE;
|
2013-11-09 20:12:28 +08:00
|
|
|
ret = of_property_read_string(np, "regulator-type", ®type);
|
2013-12-05 08:29:57 +08:00
|
|
|
if (ret >= 0) {
|
|
|
|
if (!strncmp("voltage", regtype, 7))
|
|
|
|
config->type = REGULATOR_VOLTAGE;
|
|
|
|
else if (!strncmp("current", regtype, 7))
|
|
|
|
config->type = REGULATOR_CURRENT;
|
2013-12-06 03:09:55 +08:00
|
|
|
else
|
|
|
|
dev_warn(dev, "Unknown regulator-type '%s'\n",
|
|
|
|
regtype);
|
2013-11-09 20:12:28 +08:00
|
|
|
}
|
2012-10-15 21:16:59 +08:00
|
|
|
|
|
|
|
return config;
|
|
|
|
}
|
|
|
|
|
regulator: Add driver for gpio-controlled regulators
This patch adds support for regulators that can be controlled via gpios.
Examples for such regulators are the TI-tps65024x voltage regulators
with 4 fixed and 1 runtime-switchable voltage regulators
or the TI-bq240XX charger regulators.
The number of controlling gpios is not limited, the mapping between
voltage/current and target gpio state is done via the states map
and the driver can be used for either voltage or current regulators.
A mapping for a regulator with two GPIOs could look like:
gpios = {
{ .gpio = GPIO1, .flags = GPIOF_OUT_INIT_HIGH, .label = "gpio name 1" },
{ .gpio = GPIO2, .flags = GPIOF_OUT_INIT_LOW, .label = "gpio name 2" },
}
The flags element of the gpios array determines the initial state of
the gpio, set during probe. The initial state of the regulator is also
calculated from these values
states = {
{ .value = volt_or_cur1, .gpios = (0 << 1) | (0 << 0) },
{ .value = volt_or_cur2, .gpios = (0 << 1) | (1 << 0) },
{ .value = volt_or_cur3, .gpios = (1 << 1) | (0 << 0) },
{ .value = volt_or_cur4, .gpios = (1 << 1) | (1 << 0) },
}
The target-state for the n-th gpio is determined by the n-th bit
in the bitfield of the target-value.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2011-10-05 18:27:05 +08:00
|
|
|
static struct regulator_ops gpio_regulator_current_ops = {
|
|
|
|
.get_current_limit = gpio_regulator_get_value,
|
|
|
|
.set_current_limit = gpio_regulator_set_current_limit,
|
|
|
|
};
|
|
|
|
|
2012-11-20 02:22:22 +08:00
|
|
|
static int gpio_regulator_probe(struct platform_device *pdev)
|
regulator: Add driver for gpio-controlled regulators
This patch adds support for regulators that can be controlled via gpios.
Examples for such regulators are the TI-tps65024x voltage regulators
with 4 fixed and 1 runtime-switchable voltage regulators
or the TI-bq240XX charger regulators.
The number of controlling gpios is not limited, the mapping between
voltage/current and target gpio state is done via the states map
and the driver can be used for either voltage or current regulators.
A mapping for a regulator with two GPIOs could look like:
gpios = {
{ .gpio = GPIO1, .flags = GPIOF_OUT_INIT_HIGH, .label = "gpio name 1" },
{ .gpio = GPIO2, .flags = GPIOF_OUT_INIT_LOW, .label = "gpio name 2" },
}
The flags element of the gpios array determines the initial state of
the gpio, set during probe. The initial state of the regulator is also
calculated from these values
states = {
{ .value = volt_or_cur1, .gpios = (0 << 1) | (0 << 0) },
{ .value = volt_or_cur2, .gpios = (0 << 1) | (1 << 0) },
{ .value = volt_or_cur3, .gpios = (1 << 1) | (0 << 0) },
{ .value = volt_or_cur4, .gpios = (1 << 1) | (1 << 0) },
}
The target-state for the n-th gpio is determined by the n-th bit
in the bitfield of the target-value.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2011-10-05 18:27:05 +08:00
|
|
|
{
|
2013-07-30 16:20:47 +08:00
|
|
|
struct gpio_regulator_config *config = dev_get_platdata(&pdev->dev);
|
2012-10-15 21:16:59 +08:00
|
|
|
struct device_node *np = pdev->dev.of_node;
|
regulator: Add driver for gpio-controlled regulators
This patch adds support for regulators that can be controlled via gpios.
Examples for such regulators are the TI-tps65024x voltage regulators
with 4 fixed and 1 runtime-switchable voltage regulators
or the TI-bq240XX charger regulators.
The number of controlling gpios is not limited, the mapping between
voltage/current and target gpio state is done via the states map
and the driver can be used for either voltage or current regulators.
A mapping for a regulator with two GPIOs could look like:
gpios = {
{ .gpio = GPIO1, .flags = GPIOF_OUT_INIT_HIGH, .label = "gpio name 1" },
{ .gpio = GPIO2, .flags = GPIOF_OUT_INIT_LOW, .label = "gpio name 2" },
}
The flags element of the gpios array determines the initial state of
the gpio, set during probe. The initial state of the regulator is also
calculated from these values
states = {
{ .value = volt_or_cur1, .gpios = (0 << 1) | (0 << 0) },
{ .value = volt_or_cur2, .gpios = (0 << 1) | (1 << 0) },
{ .value = volt_or_cur3, .gpios = (1 << 1) | (0 << 0) },
{ .value = volt_or_cur4, .gpios = (1 << 1) | (1 << 0) },
}
The target-state for the n-th gpio is determined by the n-th bit
in the bitfield of the target-value.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2011-10-05 18:27:05 +08:00
|
|
|
struct gpio_regulator_data *drvdata;
|
2012-04-04 07:50:22 +08:00
|
|
|
struct regulator_config cfg = { };
|
regulator: Add driver for gpio-controlled regulators
This patch adds support for regulators that can be controlled via gpios.
Examples for such regulators are the TI-tps65024x voltage regulators
with 4 fixed and 1 runtime-switchable voltage regulators
or the TI-bq240XX charger regulators.
The number of controlling gpios is not limited, the mapping between
voltage/current and target gpio state is done via the states map
and the driver can be used for either voltage or current regulators.
A mapping for a regulator with two GPIOs could look like:
gpios = {
{ .gpio = GPIO1, .flags = GPIOF_OUT_INIT_HIGH, .label = "gpio name 1" },
{ .gpio = GPIO2, .flags = GPIOF_OUT_INIT_LOW, .label = "gpio name 2" },
}
The flags element of the gpios array determines the initial state of
the gpio, set during probe. The initial state of the regulator is also
calculated from these values
states = {
{ .value = volt_or_cur1, .gpios = (0 << 1) | (0 << 0) },
{ .value = volt_or_cur2, .gpios = (0 << 1) | (1 << 0) },
{ .value = volt_or_cur3, .gpios = (1 << 1) | (0 << 0) },
{ .value = volt_or_cur4, .gpios = (1 << 1) | (1 << 0) },
}
The target-state for the n-th gpio is determined by the n-th bit
in the bitfield of the target-value.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2011-10-05 18:27:05 +08:00
|
|
|
int ptr, ret, state;
|
|
|
|
|
2012-10-15 21:16:59 +08:00
|
|
|
if (np) {
|
|
|
|
config = of_get_gpio_regulator_config(&pdev->dev, np);
|
|
|
|
if (IS_ERR(config))
|
|
|
|
return PTR_ERR(config);
|
|
|
|
}
|
|
|
|
|
2012-04-04 06:20:56 +08:00
|
|
|
drvdata = devm_kzalloc(&pdev->dev, sizeof(struct gpio_regulator_data),
|
|
|
|
GFP_KERNEL);
|
2014-01-25 01:48:18 +08:00
|
|
|
if (drvdata == NULL)
|
regulator: Add driver for gpio-controlled regulators
This patch adds support for regulators that can be controlled via gpios.
Examples for such regulators are the TI-tps65024x voltage regulators
with 4 fixed and 1 runtime-switchable voltage regulators
or the TI-bq240XX charger regulators.
The number of controlling gpios is not limited, the mapping between
voltage/current and target gpio state is done via the states map
and the driver can be used for either voltage or current regulators.
A mapping for a regulator with two GPIOs could look like:
gpios = {
{ .gpio = GPIO1, .flags = GPIOF_OUT_INIT_HIGH, .label = "gpio name 1" },
{ .gpio = GPIO2, .flags = GPIOF_OUT_INIT_LOW, .label = "gpio name 2" },
}
The flags element of the gpios array determines the initial state of
the gpio, set during probe. The initial state of the regulator is also
calculated from these values
states = {
{ .value = volt_or_cur1, .gpios = (0 << 1) | (0 << 0) },
{ .value = volt_or_cur2, .gpios = (0 << 1) | (1 << 0) },
{ .value = volt_or_cur3, .gpios = (1 << 1) | (0 << 0) },
{ .value = volt_or_cur4, .gpios = (1 << 1) | (1 << 0) },
}
The target-state for the n-th gpio is determined by the n-th bit
in the bitfield of the target-value.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2011-10-05 18:27:05 +08:00
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
drvdata->desc.name = kstrdup(config->supply_name, GFP_KERNEL);
|
|
|
|
if (drvdata->desc.name == NULL) {
|
|
|
|
dev_err(&pdev->dev, "Failed to allocate supply name\n");
|
|
|
|
ret = -ENOMEM;
|
|
|
|
goto err;
|
|
|
|
}
|
|
|
|
|
|
|
|
drvdata->gpios = kmemdup(config->gpios,
|
|
|
|
config->nr_gpios * sizeof(struct gpio),
|
|
|
|
GFP_KERNEL);
|
|
|
|
if (drvdata->gpios == NULL) {
|
|
|
|
dev_err(&pdev->dev, "Failed to allocate gpio data\n");
|
|
|
|
ret = -ENOMEM;
|
|
|
|
goto err_name;
|
|
|
|
}
|
|
|
|
|
|
|
|
drvdata->states = kmemdup(config->states,
|
|
|
|
config->nr_states *
|
|
|
|
sizeof(struct gpio_regulator_state),
|
|
|
|
GFP_KERNEL);
|
|
|
|
if (drvdata->states == NULL) {
|
|
|
|
dev_err(&pdev->dev, "Failed to allocate state data\n");
|
|
|
|
ret = -ENOMEM;
|
|
|
|
goto err_memgpio;
|
|
|
|
}
|
|
|
|
drvdata->nr_states = config->nr_states;
|
|
|
|
|
|
|
|
drvdata->desc.owner = THIS_MODULE;
|
2012-07-04 10:19:46 +08:00
|
|
|
drvdata->desc.enable_time = config->startup_delay;
|
regulator: Add driver for gpio-controlled regulators
This patch adds support for regulators that can be controlled via gpios.
Examples for such regulators are the TI-tps65024x voltage regulators
with 4 fixed and 1 runtime-switchable voltage regulators
or the TI-bq240XX charger regulators.
The number of controlling gpios is not limited, the mapping between
voltage/current and target gpio state is done via the states map
and the driver can be used for either voltage or current regulators.
A mapping for a regulator with two GPIOs could look like:
gpios = {
{ .gpio = GPIO1, .flags = GPIOF_OUT_INIT_HIGH, .label = "gpio name 1" },
{ .gpio = GPIO2, .flags = GPIOF_OUT_INIT_LOW, .label = "gpio name 2" },
}
The flags element of the gpios array determines the initial state of
the gpio, set during probe. The initial state of the regulator is also
calculated from these values
states = {
{ .value = volt_or_cur1, .gpios = (0 << 1) | (0 << 0) },
{ .value = volt_or_cur2, .gpios = (0 << 1) | (1 << 0) },
{ .value = volt_or_cur3, .gpios = (1 << 1) | (0 << 0) },
{ .value = volt_or_cur4, .gpios = (1 << 1) | (1 << 0) },
}
The target-state for the n-th gpio is determined by the n-th bit
in the bitfield of the target-value.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2011-10-05 18:27:05 +08:00
|
|
|
|
|
|
|
/* handle regulator type*/
|
|
|
|
switch (config->type) {
|
|
|
|
case REGULATOR_VOLTAGE:
|
|
|
|
drvdata->desc.type = REGULATOR_VOLTAGE;
|
|
|
|
drvdata->desc.ops = &gpio_regulator_voltage_ops;
|
|
|
|
drvdata->desc.n_voltages = config->nr_states;
|
|
|
|
break;
|
|
|
|
case REGULATOR_CURRENT:
|
|
|
|
drvdata->desc.type = REGULATOR_CURRENT;
|
|
|
|
drvdata->desc.ops = &gpio_regulator_current_ops;
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
dev_err(&pdev->dev, "No regulator type set\n");
|
|
|
|
ret = -EINVAL;
|
|
|
|
goto err_memgpio;
|
|
|
|
}
|
|
|
|
|
|
|
|
drvdata->nr_gpios = config->nr_gpios;
|
|
|
|
ret = gpio_request_array(drvdata->gpios, drvdata->nr_gpios);
|
|
|
|
if (ret) {
|
|
|
|
dev_err(&pdev->dev,
|
|
|
|
"Could not obtain regulator setting GPIOs: %d\n", ret);
|
2012-07-04 10:20:46 +08:00
|
|
|
goto err_memstate;
|
regulator: Add driver for gpio-controlled regulators
This patch adds support for regulators that can be controlled via gpios.
Examples for such regulators are the TI-tps65024x voltage regulators
with 4 fixed and 1 runtime-switchable voltage regulators
or the TI-bq240XX charger regulators.
The number of controlling gpios is not limited, the mapping between
voltage/current and target gpio state is done via the states map
and the driver can be used for either voltage or current regulators.
A mapping for a regulator with two GPIOs could look like:
gpios = {
{ .gpio = GPIO1, .flags = GPIOF_OUT_INIT_HIGH, .label = "gpio name 1" },
{ .gpio = GPIO2, .flags = GPIOF_OUT_INIT_LOW, .label = "gpio name 2" },
}
The flags element of the gpios array determines the initial state of
the gpio, set during probe. The initial state of the regulator is also
calculated from these values
states = {
{ .value = volt_or_cur1, .gpios = (0 << 1) | (0 << 0) },
{ .value = volt_or_cur2, .gpios = (0 << 1) | (1 << 0) },
{ .value = volt_or_cur3, .gpios = (1 << 1) | (0 << 0) },
{ .value = volt_or_cur4, .gpios = (1 << 1) | (1 << 0) },
}
The target-state for the n-th gpio is determined by the n-th bit
in the bitfield of the target-value.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2011-10-05 18:27:05 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
/* build initial state from gpio init data. */
|
|
|
|
state = 0;
|
|
|
|
for (ptr = 0; ptr < drvdata->nr_gpios; ptr++) {
|
|
|
|
if (config->gpios[ptr].flags & GPIOF_OUT_INIT_HIGH)
|
|
|
|
state |= (1 << ptr);
|
|
|
|
}
|
|
|
|
drvdata->state = state;
|
|
|
|
|
2012-04-04 07:50:22 +08:00
|
|
|
cfg.dev = &pdev->dev;
|
|
|
|
cfg.init_data = config->init_data;
|
2012-06-04 03:30:33 +08:00
|
|
|
cfg.driver_data = drvdata;
|
2012-11-12 17:59:52 +08:00
|
|
|
cfg.of_node = np;
|
2012-04-04 07:50:22 +08:00
|
|
|
|
2014-11-04 02:12:06 +08:00
|
|
|
if (gpio_is_valid(config->enable_gpio)) {
|
2012-07-04 10:20:46 +08:00
|
|
|
cfg.ena_gpio = config->enable_gpio;
|
2014-11-04 02:12:04 +08:00
|
|
|
cfg.ena_gpio_initialized = true;
|
|
|
|
}
|
2012-07-04 10:20:46 +08:00
|
|
|
cfg.ena_gpio_invert = !config->enable_high;
|
|
|
|
if (config->enabled_at_boot) {
|
|
|
|
if (config->enable_high)
|
|
|
|
cfg.ena_gpio_flags |= GPIOF_OUT_INIT_HIGH;
|
|
|
|
else
|
|
|
|
cfg.ena_gpio_flags |= GPIOF_OUT_INIT_LOW;
|
|
|
|
} else {
|
|
|
|
if (config->enable_high)
|
|
|
|
cfg.ena_gpio_flags |= GPIOF_OUT_INIT_LOW;
|
|
|
|
else
|
|
|
|
cfg.ena_gpio_flags |= GPIOF_OUT_INIT_HIGH;
|
|
|
|
}
|
|
|
|
|
2012-04-04 07:50:22 +08:00
|
|
|
drvdata->dev = regulator_register(&drvdata->desc, &cfg);
|
regulator: Add driver for gpio-controlled regulators
This patch adds support for regulators that can be controlled via gpios.
Examples for such regulators are the TI-tps65024x voltage regulators
with 4 fixed and 1 runtime-switchable voltage regulators
or the TI-bq240XX charger regulators.
The number of controlling gpios is not limited, the mapping between
voltage/current and target gpio state is done via the states map
and the driver can be used for either voltage or current regulators.
A mapping for a regulator with two GPIOs could look like:
gpios = {
{ .gpio = GPIO1, .flags = GPIOF_OUT_INIT_HIGH, .label = "gpio name 1" },
{ .gpio = GPIO2, .flags = GPIOF_OUT_INIT_LOW, .label = "gpio name 2" },
}
The flags element of the gpios array determines the initial state of
the gpio, set during probe. The initial state of the regulator is also
calculated from these values
states = {
{ .value = volt_or_cur1, .gpios = (0 << 1) | (0 << 0) },
{ .value = volt_or_cur2, .gpios = (0 << 1) | (1 << 0) },
{ .value = volt_or_cur3, .gpios = (1 << 1) | (0 << 0) },
{ .value = volt_or_cur4, .gpios = (1 << 1) | (1 << 0) },
}
The target-state for the n-th gpio is determined by the n-th bit
in the bitfield of the target-value.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2011-10-05 18:27:05 +08:00
|
|
|
if (IS_ERR(drvdata->dev)) {
|
|
|
|
ret = PTR_ERR(drvdata->dev);
|
|
|
|
dev_err(&pdev->dev, "Failed to register regulator: %d\n", ret);
|
|
|
|
goto err_stategpio;
|
|
|
|
}
|
|
|
|
|
|
|
|
platform_set_drvdata(pdev, drvdata);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
err_stategpio:
|
|
|
|
gpio_free_array(drvdata->gpios, drvdata->nr_gpios);
|
|
|
|
err_memstate:
|
|
|
|
kfree(drvdata->states);
|
|
|
|
err_memgpio:
|
|
|
|
kfree(drvdata->gpios);
|
|
|
|
err_name:
|
|
|
|
kfree(drvdata->desc.name);
|
|
|
|
err:
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2012-11-20 02:26:10 +08:00
|
|
|
static int gpio_regulator_remove(struct platform_device *pdev)
|
regulator: Add driver for gpio-controlled regulators
This patch adds support for regulators that can be controlled via gpios.
Examples for such regulators are the TI-tps65024x voltage regulators
with 4 fixed and 1 runtime-switchable voltage regulators
or the TI-bq240XX charger regulators.
The number of controlling gpios is not limited, the mapping between
voltage/current and target gpio state is done via the states map
and the driver can be used for either voltage or current regulators.
A mapping for a regulator with two GPIOs could look like:
gpios = {
{ .gpio = GPIO1, .flags = GPIOF_OUT_INIT_HIGH, .label = "gpio name 1" },
{ .gpio = GPIO2, .flags = GPIOF_OUT_INIT_LOW, .label = "gpio name 2" },
}
The flags element of the gpios array determines the initial state of
the gpio, set during probe. The initial state of the regulator is also
calculated from these values
states = {
{ .value = volt_or_cur1, .gpios = (0 << 1) | (0 << 0) },
{ .value = volt_or_cur2, .gpios = (0 << 1) | (1 << 0) },
{ .value = volt_or_cur3, .gpios = (1 << 1) | (0 << 0) },
{ .value = volt_or_cur4, .gpios = (1 << 1) | (1 << 0) },
}
The target-state for the n-th gpio is determined by the n-th bit
in the bitfield of the target-value.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2011-10-05 18:27:05 +08:00
|
|
|
{
|
|
|
|
struct gpio_regulator_data *drvdata = platform_get_drvdata(pdev);
|
|
|
|
|
|
|
|
regulator_unregister(drvdata->dev);
|
|
|
|
|
|
|
|
gpio_free_array(drvdata->gpios, drvdata->nr_gpios);
|
|
|
|
|
|
|
|
kfree(drvdata->states);
|
|
|
|
kfree(drvdata->gpios);
|
|
|
|
|
|
|
|
kfree(drvdata->desc.name);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2012-12-04 10:32:05 +08:00
|
|
|
#if defined(CONFIG_OF)
|
2012-12-22 05:26:06 +08:00
|
|
|
static const struct of_device_id regulator_gpio_of_match[] = {
|
2012-10-15 21:16:59 +08:00
|
|
|
{ .compatible = "regulator-gpio", },
|
|
|
|
{},
|
|
|
|
};
|
2012-12-04 10:32:05 +08:00
|
|
|
#endif
|
2012-10-15 21:16:59 +08:00
|
|
|
|
regulator: Add driver for gpio-controlled regulators
This patch adds support for regulators that can be controlled via gpios.
Examples for such regulators are the TI-tps65024x voltage regulators
with 4 fixed and 1 runtime-switchable voltage regulators
or the TI-bq240XX charger regulators.
The number of controlling gpios is not limited, the mapping between
voltage/current and target gpio state is done via the states map
and the driver can be used for either voltage or current regulators.
A mapping for a regulator with two GPIOs could look like:
gpios = {
{ .gpio = GPIO1, .flags = GPIOF_OUT_INIT_HIGH, .label = "gpio name 1" },
{ .gpio = GPIO2, .flags = GPIOF_OUT_INIT_LOW, .label = "gpio name 2" },
}
The flags element of the gpios array determines the initial state of
the gpio, set during probe. The initial state of the regulator is also
calculated from these values
states = {
{ .value = volt_or_cur1, .gpios = (0 << 1) | (0 << 0) },
{ .value = volt_or_cur2, .gpios = (0 << 1) | (1 << 0) },
{ .value = volt_or_cur3, .gpios = (1 << 1) | (0 << 0) },
{ .value = volt_or_cur4, .gpios = (1 << 1) | (1 << 0) },
}
The target-state for the n-th gpio is determined by the n-th bit
in the bitfield of the target-value.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2011-10-05 18:27:05 +08:00
|
|
|
static struct platform_driver gpio_regulator_driver = {
|
|
|
|
.probe = gpio_regulator_probe,
|
2012-11-20 02:20:42 +08:00
|
|
|
.remove = gpio_regulator_remove,
|
regulator: Add driver for gpio-controlled regulators
This patch adds support for regulators that can be controlled via gpios.
Examples for such regulators are the TI-tps65024x voltage regulators
with 4 fixed and 1 runtime-switchable voltage regulators
or the TI-bq240XX charger regulators.
The number of controlling gpios is not limited, the mapping between
voltage/current and target gpio state is done via the states map
and the driver can be used for either voltage or current regulators.
A mapping for a regulator with two GPIOs could look like:
gpios = {
{ .gpio = GPIO1, .flags = GPIOF_OUT_INIT_HIGH, .label = "gpio name 1" },
{ .gpio = GPIO2, .flags = GPIOF_OUT_INIT_LOW, .label = "gpio name 2" },
}
The flags element of the gpios array determines the initial state of
the gpio, set during probe. The initial state of the regulator is also
calculated from these values
states = {
{ .value = volt_or_cur1, .gpios = (0 << 1) | (0 << 0) },
{ .value = volt_or_cur2, .gpios = (0 << 1) | (1 << 0) },
{ .value = volt_or_cur3, .gpios = (1 << 1) | (0 << 0) },
{ .value = volt_or_cur4, .gpios = (1 << 1) | (1 << 0) },
}
The target-state for the n-th gpio is determined by the n-th bit
in the bitfield of the target-value.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2011-10-05 18:27:05 +08:00
|
|
|
.driver = {
|
|
|
|
.name = "gpio-regulator",
|
|
|
|
.owner = THIS_MODULE,
|
2012-12-04 10:32:05 +08:00
|
|
|
.of_match_table = of_match_ptr(regulator_gpio_of_match),
|
regulator: Add driver for gpio-controlled regulators
This patch adds support for regulators that can be controlled via gpios.
Examples for such regulators are the TI-tps65024x voltage regulators
with 4 fixed and 1 runtime-switchable voltage regulators
or the TI-bq240XX charger regulators.
The number of controlling gpios is not limited, the mapping between
voltage/current and target gpio state is done via the states map
and the driver can be used for either voltage or current regulators.
A mapping for a regulator with two GPIOs could look like:
gpios = {
{ .gpio = GPIO1, .flags = GPIOF_OUT_INIT_HIGH, .label = "gpio name 1" },
{ .gpio = GPIO2, .flags = GPIOF_OUT_INIT_LOW, .label = "gpio name 2" },
}
The flags element of the gpios array determines the initial state of
the gpio, set during probe. The initial state of the regulator is also
calculated from these values
states = {
{ .value = volt_or_cur1, .gpios = (0 << 1) | (0 << 0) },
{ .value = volt_or_cur2, .gpios = (0 << 1) | (1 << 0) },
{ .value = volt_or_cur3, .gpios = (1 << 1) | (0 << 0) },
{ .value = volt_or_cur4, .gpios = (1 << 1) | (1 << 0) },
}
The target-state for the n-th gpio is determined by the n-th bit
in the bitfield of the target-value.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2011-10-05 18:27:05 +08:00
|
|
|
},
|
|
|
|
};
|
|
|
|
|
|
|
|
static int __init gpio_regulator_init(void)
|
|
|
|
{
|
|
|
|
return platform_driver_register(&gpio_regulator_driver);
|
|
|
|
}
|
|
|
|
subsys_initcall(gpio_regulator_init);
|
|
|
|
|
|
|
|
static void __exit gpio_regulator_exit(void)
|
|
|
|
{
|
|
|
|
platform_driver_unregister(&gpio_regulator_driver);
|
|
|
|
}
|
|
|
|
module_exit(gpio_regulator_exit);
|
|
|
|
|
|
|
|
MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>");
|
|
|
|
MODULE_DESCRIPTION("gpio voltage regulator");
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
MODULE_ALIAS("platform:gpio-regulator");
|