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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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#include <linux/err.h>#include <linux/mutex.h>#include <linux/module.h>#include <linux/platform_device.h>#include <linux/pm_domain.h>#include <linux/pm_opp.h>#include <linux/regulator/driver.h>#include <linux/regulator/fixed.h>#include <linux/gpio/consumer.h>#include <linux/slab.h>#include <linux/of.h>#include <linux/regulator/of_regulator.h>#include <linux/regulator/machine.h>#include <linux/clk.h>#include <linux/string.h>
struct fixed_voltage_data { struct regulator_desc desc; struct regulator_dev *dev;
struct clk *enable_clock; unsigned int enable_counter; int performance_state;};
struct fixed_dev_type { bool has_enable_clock; bool has_performance_state;};
static int reg_clock_enable(struct regulator_dev *rdev){ struct fixed_voltage_data *priv = rdev_get_drvdata(rdev); int ret = 0;
ret = clk_prepare_enable(priv->enable_clock); if (ret) return ret;
priv->enable_counter++;
return ret;}
static int reg_clock_disable(struct regulator_dev *rdev){ struct fixed_voltage_data *priv = rdev_get_drvdata(rdev);
clk_disable_unprepare(priv->enable_clock); priv->enable_counter--;
return 0;}
static int reg_domain_enable(struct regulator_dev *rdev){ struct fixed_voltage_data *priv = rdev_get_drvdata(rdev); struct device *dev = rdev->dev.parent; int ret;
ret = dev_pm_genpd_set_performance_state(dev, priv->performance_state); if (ret) return ret;
priv->enable_counter++;
return ret;}
static int reg_domain_disable(struct regulator_dev *rdev){ struct fixed_voltage_data *priv = rdev_get_drvdata(rdev); struct device *dev = rdev->dev.parent; int ret;
ret = dev_pm_genpd_set_performance_state(dev, 0); if (ret) return ret;
priv->enable_counter--;
return 0;}
static int reg_is_enabled(struct regulator_dev *rdev){ struct fixed_voltage_data *priv = rdev_get_drvdata(rdev);
return priv->enable_counter > 0;}
static irqreturn_t reg_fixed_under_voltage_irq_handler(int irq, void *data){ struct fixed_voltage_data *priv = data; struct regulator_dev *rdev = priv->dev;
regulator_notifier_call_chain(rdev, REGULATOR_EVENT_UNDER_VOLTAGE, NULL);
return IRQ_HANDLED;}
/** * reg_fixed_get_irqs - Get and register the optional IRQ for fixed voltage * regulator. * @dev: Pointer to the device structure. * @priv: Pointer to fixed_voltage_data structure containing private data. * * This function tries to get the IRQ from the device firmware node. * If it's an optional IRQ and not found, it returns 0. * Otherwise, it attempts to request the threaded IRQ. * * Return: 0 on success, or a negative error number on failure. */static int reg_fixed_get_irqs(struct device *dev, struct fixed_voltage_data *priv){ int ret;
ret = fwnode_irq_get(dev_fwnode(dev), 0); /* This is optional IRQ. If not found we will get -EINVAL */ if (ret == -EINVAL) return 0; if (ret < 0) return dev_err_probe(dev, ret, "Failed to get IRQ\n");
ret = devm_request_threaded_irq(dev, ret, NULL, reg_fixed_under_voltage_irq_handler, IRQF_ONESHOT, "under-voltage", priv); if (ret) return dev_err_probe(dev, ret, "Failed to request IRQ\n");
return 0;}
/** * of_get_fixed_voltage_config - extract fixed_voltage_config structure info * @dev: device requesting for fixed_voltage_config * @desc: regulator description * * Populates fixed_voltage_config structure by extracting data from device * tree node. * * Return: Pointer to a populated &struct fixed_voltage_config or %NULL if * memory allocation fails. */static struct fixed_voltage_config *of_get_fixed_voltage_config(struct device *dev, const struct regulator_desc *desc){ struct fixed_voltage_config *config; struct device_node *np = dev->of_node; struct regulator_init_data *init_data;
config = devm_kzalloc(dev, sizeof(struct fixed_voltage_config), GFP_KERNEL); if (!config) return ERR_PTR(-ENOMEM);
config->init_data = of_get_regulator_init_data(dev, dev->of_node, desc); if (!config->init_data) return ERR_PTR(-EINVAL);
init_data = config->init_data; init_data->constraints.apply_uV = 0;
config->supply_name = init_data->constraints.name; if (init_data->constraints.min_uV == init_data->constraints.max_uV) { config->microvolts = init_data->constraints.min_uV; } else { dev_err(dev, "Fixed regulator specified with variable voltages\n"); return ERR_PTR(-EINVAL); }
if (init_data->constraints.boot_on) config->enabled_at_boot = true;
of_property_read_u32(np, "startup-delay-us", &config->startup_delay); of_property_read_u32(np, "off-on-delay-us", &config->off_on_delay);
if (of_property_present(np, "vin-supply")) config->input_supply = "vin";
return config;}
static const struct regulator_ops fixed_voltage_ops = {};
static const struct regulator_ops fixed_voltage_clkenabled_ops = { .enable = reg_clock_enable, .disable = reg_clock_disable, .is_enabled = reg_is_enabled,};
static const struct regulator_ops fixed_voltage_domain_ops = { .enable = reg_domain_enable, .disable = reg_domain_disable, .is_enabled = reg_is_enabled,};
static int reg_fixed_voltage_probe(struct platform_device *pdev){ struct device *dev = &pdev->dev; struct fixed_voltage_config *config; struct fixed_voltage_data *drvdata; const struct fixed_dev_type *drvtype = of_device_get_match_data(dev); struct regulator_config cfg = { }; enum gpiod_flags gflags; int ret;
if (!pdev->dev.of_node && strcmp(pdev->name, "reg-fixed-voltage")) return -ENODEV;
drvdata = devm_kzalloc(&pdev->dev, sizeof(struct fixed_voltage_data), GFP_KERNEL); if (!drvdata) return -ENOMEM;
if (pdev->dev.of_node) { config = of_get_fixed_voltage_config(&pdev->dev, &drvdata->desc); if (IS_ERR(config)) return PTR_ERR(config); } else { config = dev_get_platdata(&pdev->dev); }
if (!config) return -ENOMEM;
drvdata->desc.name = devm_kstrdup(&pdev->dev, config->supply_name, GFP_KERNEL); if (drvdata->desc.name == NULL) { dev_err(&pdev->dev, "Failed to allocate supply name\n"); return -ENOMEM; } drvdata->desc.type = REGULATOR_VOLTAGE; drvdata->desc.owner = THIS_MODULE;
if (drvtype && drvtype->has_enable_clock) { drvdata->desc.ops = &fixed_voltage_clkenabled_ops;
drvdata->enable_clock = devm_clk_get(dev, NULL); if (IS_ERR(drvdata->enable_clock)) { dev_err(dev, "Can't get enable-clock from devicetree\n"); return PTR_ERR(drvdata->enable_clock); } } else if (drvtype && drvtype->has_performance_state) { drvdata->desc.ops = &fixed_voltage_domain_ops;
drvdata->performance_state = of_get_required_opp_performance_state(dev->of_node, 0); if (drvdata->performance_state < 0) { dev_err(dev, "Can't get performance state from devicetree\n"); return drvdata->performance_state; } } else { drvdata->desc.ops = &fixed_voltage_ops; }
drvdata->desc.enable_time = config->startup_delay; drvdata->desc.off_on_delay = config->off_on_delay;
if (config->input_supply) { drvdata->desc.supply_name = devm_kstrdup(&pdev->dev, config->input_supply, GFP_KERNEL); if (!drvdata->desc.supply_name) return -ENOMEM; }
if (config->microvolts) drvdata->desc.n_voltages = 1;
drvdata->desc.fixed_uV = config->microvolts;
/* * The signal will be inverted by the GPIO core if flagged so in the * descriptor. */ if (config->enabled_at_boot) gflags = GPIOD_OUT_HIGH; else gflags = GPIOD_OUT_LOW;
/* * Some fixed regulators share the enable line between two * regulators which makes it necessary to get a handle on the * same descriptor for two different consumers. This will get * the GPIO descriptor, but only the first call will initialize * it so any flags such as inversion or open drain will only * be set up by the first caller and assumed identical on the * next caller. * * FIXME: find a better way to deal with this. */ gflags |= GPIOD_FLAGS_BIT_NONEXCLUSIVE;
/* * Do not use devm* here: the regulator core takes over the * lifecycle management of the GPIO descriptor. */ cfg.ena_gpiod = gpiod_get_optional(&pdev->dev, NULL, gflags); if (IS_ERR(cfg.ena_gpiod)) return dev_err_probe(&pdev->dev, PTR_ERR(cfg.ena_gpiod), "can't get GPIO\n");
cfg.dev = &pdev->dev; cfg.init_data = config->init_data; cfg.driver_data = drvdata; cfg.of_node = pdev->dev.of_node;
drvdata->dev = devm_regulator_register(&pdev->dev, &drvdata->desc, &cfg); if (IS_ERR(drvdata->dev)) return dev_err_probe(&pdev->dev, PTR_ERR(drvdata->dev), "Failed to register regulator: %ld\n", PTR_ERR(drvdata->dev));
platform_set_drvdata(pdev, drvdata);
dev_dbg(&pdev->dev, "%s supplying %duV\n", drvdata->desc.name, drvdata->desc.fixed_uV);
ret = reg_fixed_get_irqs(dev, drvdata); if (ret) return ret;
return 0;}
#if defined(CONFIG_OF)static const struct fixed_dev_type fixed_voltage_data = { .has_enable_clock = false,};
static const struct fixed_dev_type fixed_clkenable_data = { .has_enable_clock = true,};
static const struct fixed_dev_type fixed_domain_data = { .has_performance_state = true,};
static const struct of_device_id fixed_of_match[] = { { .compatible = "regulator-fixed", .data = &fixed_voltage_data, }, { .compatible = "regulator-fixed-clock", .data = &fixed_clkenable_data, }, { .compatible = "regulator-fixed-domain", .data = &fixed_domain_data, }, { },};MODULE_DEVICE_TABLE(of, fixed_of_match);#endif
static struct platform_driver regulator_fixed_voltage_driver = { .probe = reg_fixed_voltage_probe, .driver = { .name = "reg-fixed-voltage", .probe_type = PROBE_PREFER_ASYNCHRONOUS, .of_match_table = of_match_ptr(fixed_of_match), },};
static int __init regulator_fixed_voltage_init(void){ return platform_driver_register(®ulator_fixed_voltage_driver);}subsys_initcall(regulator_fixed_voltage_init);
static void __exit regulator_fixed_voltage_exit(void){ platform_driver_unregister(®ulator_fixed_voltage_driver);}module_exit(regulator_fixed_voltage_exit);
MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");MODULE_DESCRIPTION("Fixed voltage regulator");MODULE_LICENSE("GPL");MODULE_ALIAS("platform:reg-fixed-voltage");