263 lines
5.6 KiB
C
263 lines
5.6 KiB
C
/*
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* barebox regulator support
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*
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* Copyright (c) 2014 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <common.h>
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#include <regulator.h>
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#include <of.h>
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#include <malloc.h>
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#include <linux/err.h>
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static LIST_HEAD(regulator_list);
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struct regulator_internal {
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struct list_head list;
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struct device_node *node;
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struct regulator_dev *rdev;
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int enable_count;
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int enable_time_us;
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int min_uv;
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int max_uv;
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char *name;
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struct list_head consumer_list;
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};
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struct regulator {
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struct regulator_internal *ri;
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struct list_head list;
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struct device_d *dev;
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};
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/*
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* of_regulator_register - register a regulator corresponding to a device_node
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* @rd: the regulator device providing the ops
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* @node: the device_node this regulator corresponds to
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*
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* Return: 0 for success or a negative error code
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*/
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int of_regulator_register(struct regulator_dev *rd, struct device_node *node)
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{
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struct regulator_internal *ri;
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const char *name;
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ri = xzalloc(sizeof(*ri));
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ri->rdev = rd;
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ri->node = node;
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INIT_LIST_HEAD(&ri->consumer_list);
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list_add_tail(&ri->list, ®ulator_list);
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name = of_get_property(node, "regulator-name", NULL);
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if (name)
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ri->name = xstrdup(name);
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of_property_read_u32(node, "regulator-enable-ramp-delay",
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&ri->enable_time_us);
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of_property_read_u32(node, "regulator-min-microvolt",
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&ri->min_uv);
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of_property_read_u32(node, "regulator-max-microvolt",
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&ri->max_uv);
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return 0;
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}
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static struct regulator_internal *of_regulator_get(struct device_d *dev, const char *supply)
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{
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char *propname;
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struct regulator_internal *ri;
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struct device_node *node;
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propname = asprintf("%s-supply", supply);
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/*
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* If the device does have a device node return the dummy regulator.
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*/
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if (!dev->device_node)
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return NULL;
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/*
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* If the device node does not contain a supply property, this device doesn't
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* need a regulator. Return the dummy regulator in this case.
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*/
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if (!of_get_property(dev->device_node, propname, NULL)) {
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dev_dbg(dev, "No %s-supply node found, using dummy regulator\n",
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supply);
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ri = NULL;
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goto out;
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}
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/*
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* The device node specifies a supply, so it's mandatory. Return an error when
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* something goes wrong below.
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*/
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node = of_parse_phandle(dev->device_node, propname, 0);
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if (!node) {
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dev_dbg(dev, "No %s node found\n", propname);
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ri = ERR_PTR(-EINVAL);
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goto out;
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}
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list_for_each_entry(ri, ®ulator_list, list) {
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if (ri->node == node) {
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dev_dbg(dev, "Using %s regulator from %s\n",
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propname, node->full_name);
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goto out;
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}
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}
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ri = ERR_PTR(-ENODEV);
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out:
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free(propname);
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return ri;
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}
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/*
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* regulator_get - get the supply for a device.
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* @dev: the device a supply is requested for
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* @supply: the supply name
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*
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* This returns a supply for a device. Check the result with IS_ERR().
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* NULL is a valid regulator, the dummy regulator.
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*
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* Return: a regulator object or an error pointer
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*/
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struct regulator *regulator_get(struct device_d *dev, const char *supply)
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{
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struct regulator_internal *ri;
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struct regulator *r;
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if (!dev->device_node)
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return NULL;
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ri = of_regulator_get(dev, supply);
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if (IS_ERR(ri))
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return ERR_CAST(ri);
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if (!ri)
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return NULL;
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r = xzalloc(sizeof(*r));
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r->ri = ri;
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r->dev = dev;
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list_add_tail(&r->list, &ri->consumer_list);
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return r;
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}
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/*
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* regulator_enable - enable a regulator.
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* @r: the regulator to enable
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*
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* This enables a regulator. Regulators are reference counted, only the
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* first enable operation will enable the regulator.
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*
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* Return: 0 for success or a negative error code
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*/
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int regulator_enable(struct regulator *r)
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{
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struct regulator_internal *ri;
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int ret;
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if (!r)
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return 0;
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ri = r->ri;
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if (ri->enable_count) {
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ri->enable_count++;
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return 0;
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}
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if (!ri->rdev->ops->enable)
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return -ENOSYS;
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ret = ri->rdev->ops->enable(ri->rdev);
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if (ret)
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return ret;
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if (ri->enable_time_us)
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udelay(ri->enable_time_us);
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ri->enable_count++;
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return 0;
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}
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/*
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* regulator_disable - disable a regulator.
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* @r: the regulator to disable
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*
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* This disables a regulator. Regulators are reference counted, only the
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* when balanced with regulator_enable the regulator will be disabled.
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*
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* Return: 0 for success or a negative error code
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*/
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int regulator_disable(struct regulator *r)
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{
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struct regulator_internal *ri;
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int ret;
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if (!r)
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return 0;
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ri = r->ri;
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if (!ri->enable_count)
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return -EINVAL;
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if (!ri->rdev->ops->disable)
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return -ENOSYS;
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ret = ri->rdev->ops->disable(ri->rdev);
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if (ret)
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return ret;
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ri->enable_count--;
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return 0;
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}
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static void regulator_print_one(struct regulator_internal *ri)
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{
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struct regulator *r;
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printf("%-20s %6d %10d %10d\n", ri->name, ri->enable_count, ri->min_uv, ri->max_uv);
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if (!list_empty(&ri->consumer_list)) {
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printf(" consumers:\n");
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list_for_each_entry(r, &ri->consumer_list, list)
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printf(" %s\n", dev_name(r->dev));
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}
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}
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/*
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* regulators_print - print informations about all regulators
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*/
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void regulators_print(void)
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{
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struct regulator_internal *ri;
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printf("%-20s %6s %10s %10s\n", "name", "enable", "min_uv", "max_uv");
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list_for_each_entry(ri, ®ulator_list, list)
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regulator_print_one(ri);
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}
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