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207 lines
5.9 KiB
207 lines
5.9 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* Driver for Analog Devices (Linear Technology) LT3651 charger IC. |
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* Copyright (C) 2017, Topic Embedded Products |
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*/ |
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#include <linux/device.h> |
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#include <linux/gpio/consumer.h> |
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#include <linux/init.h> |
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#include <linux/interrupt.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/platform_device.h> |
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#include <linux/power_supply.h> |
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#include <linux/slab.h> |
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#include <linux/of.h> |
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struct lt3651_charger { |
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struct power_supply *charger; |
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struct power_supply_desc charger_desc; |
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struct gpio_desc *acpr_gpio; |
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struct gpio_desc *fault_gpio; |
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struct gpio_desc *chrg_gpio; |
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}; |
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static irqreturn_t lt3651_charger_irq(int irq, void *devid) |
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{ |
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struct power_supply *charger = devid; |
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power_supply_changed(charger); |
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return IRQ_HANDLED; |
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} |
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static inline struct lt3651_charger *psy_to_lt3651_charger( |
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struct power_supply *psy) |
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{ |
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return power_supply_get_drvdata(psy); |
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} |
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static int lt3651_charger_get_property(struct power_supply *psy, |
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enum power_supply_property psp, union power_supply_propval *val) |
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{ |
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struct lt3651_charger *lt3651_charger = psy_to_lt3651_charger(psy); |
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switch (psp) { |
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case POWER_SUPPLY_PROP_STATUS: |
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if (!lt3651_charger->chrg_gpio) { |
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val->intval = POWER_SUPPLY_STATUS_UNKNOWN; |
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break; |
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} |
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if (gpiod_get_value(lt3651_charger->chrg_gpio)) |
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val->intval = POWER_SUPPLY_STATUS_CHARGING; |
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else |
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val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; |
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break; |
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case POWER_SUPPLY_PROP_ONLINE: |
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val->intval = gpiod_get_value(lt3651_charger->acpr_gpio); |
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break; |
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case POWER_SUPPLY_PROP_HEALTH: |
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if (!lt3651_charger->fault_gpio) { |
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val->intval = POWER_SUPPLY_HEALTH_UNKNOWN; |
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break; |
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} |
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if (!gpiod_get_value(lt3651_charger->fault_gpio)) { |
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val->intval = POWER_SUPPLY_HEALTH_GOOD; |
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break; |
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} |
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/* |
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* If the fault pin is active, the chrg pin explains the type |
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* of failure. |
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*/ |
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if (!lt3651_charger->chrg_gpio) { |
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val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; |
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break; |
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} |
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val->intval = gpiod_get_value(lt3651_charger->chrg_gpio) ? |
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POWER_SUPPLY_HEALTH_OVERHEAT : |
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POWER_SUPPLY_HEALTH_DEAD; |
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break; |
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default: |
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return -EINVAL; |
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} |
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return 0; |
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} |
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static enum power_supply_property lt3651_charger_properties[] = { |
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POWER_SUPPLY_PROP_STATUS, |
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POWER_SUPPLY_PROP_ONLINE, |
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POWER_SUPPLY_PROP_HEALTH, |
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}; |
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static int lt3651_charger_probe(struct platform_device *pdev) |
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{ |
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struct power_supply_config psy_cfg = {}; |
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struct lt3651_charger *lt3651_charger; |
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struct power_supply_desc *charger_desc; |
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int ret; |
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lt3651_charger = devm_kzalloc(&pdev->dev, sizeof(*lt3651_charger), |
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GFP_KERNEL); |
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if (!lt3651_charger) |
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return -ENOMEM; |
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lt3651_charger->acpr_gpio = devm_gpiod_get(&pdev->dev, |
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"lltc,acpr", GPIOD_IN); |
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if (IS_ERR(lt3651_charger->acpr_gpio)) { |
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ret = PTR_ERR(lt3651_charger->acpr_gpio); |
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dev_err(&pdev->dev, "Failed to acquire acpr GPIO: %d\n", ret); |
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return ret; |
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} |
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lt3651_charger->fault_gpio = devm_gpiod_get_optional(&pdev->dev, |
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"lltc,fault", GPIOD_IN); |
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if (IS_ERR(lt3651_charger->fault_gpio)) { |
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ret = PTR_ERR(lt3651_charger->fault_gpio); |
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dev_err(&pdev->dev, "Failed to acquire fault GPIO: %d\n", ret); |
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return ret; |
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} |
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lt3651_charger->chrg_gpio = devm_gpiod_get_optional(&pdev->dev, |
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"lltc,chrg", GPIOD_IN); |
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if (IS_ERR(lt3651_charger->chrg_gpio)) { |
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ret = PTR_ERR(lt3651_charger->chrg_gpio); |
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dev_err(&pdev->dev, "Failed to acquire chrg GPIO: %d\n", ret); |
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return ret; |
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} |
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charger_desc = <3651_charger->charger_desc; |
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charger_desc->name = pdev->dev.of_node->name; |
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charger_desc->type = POWER_SUPPLY_TYPE_MAINS; |
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charger_desc->properties = lt3651_charger_properties; |
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charger_desc->num_properties = ARRAY_SIZE(lt3651_charger_properties); |
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charger_desc->get_property = lt3651_charger_get_property; |
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psy_cfg.of_node = pdev->dev.of_node; |
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psy_cfg.drv_data = lt3651_charger; |
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lt3651_charger->charger = devm_power_supply_register(&pdev->dev, |
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charger_desc, &psy_cfg); |
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if (IS_ERR(lt3651_charger->charger)) { |
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ret = PTR_ERR(lt3651_charger->charger); |
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dev_err(&pdev->dev, "Failed to register power supply: %d\n", |
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ret); |
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return ret; |
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} |
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/* |
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* Acquire IRQs for the GPIO pins if possible. If the system does not |
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* support IRQs on these pins, userspace will have to poll the sysfs |
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* files manually. |
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*/ |
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if (lt3651_charger->acpr_gpio) { |
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ret = gpiod_to_irq(lt3651_charger->acpr_gpio); |
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if (ret >= 0) |
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ret = devm_request_any_context_irq(&pdev->dev, ret, |
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lt3651_charger_irq, |
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IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, |
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dev_name(&pdev->dev), lt3651_charger->charger); |
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if (ret < 0) |
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dev_warn(&pdev->dev, "Failed to request acpr irq\n"); |
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} |
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if (lt3651_charger->fault_gpio) { |
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ret = gpiod_to_irq(lt3651_charger->fault_gpio); |
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if (ret >= 0) |
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ret = devm_request_any_context_irq(&pdev->dev, ret, |
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lt3651_charger_irq, |
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IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, |
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dev_name(&pdev->dev), lt3651_charger->charger); |
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if (ret < 0) |
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dev_warn(&pdev->dev, "Failed to request fault irq\n"); |
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} |
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if (lt3651_charger->chrg_gpio) { |
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ret = gpiod_to_irq(lt3651_charger->chrg_gpio); |
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if (ret >= 0) |
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ret = devm_request_any_context_irq(&pdev->dev, ret, |
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lt3651_charger_irq, |
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IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, |
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dev_name(&pdev->dev), lt3651_charger->charger); |
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if (ret < 0) |
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dev_warn(&pdev->dev, "Failed to request chrg irq\n"); |
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} |
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platform_set_drvdata(pdev, lt3651_charger); |
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return 0; |
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} |
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static const struct of_device_id lt3651_charger_match[] = { |
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{ .compatible = "lltc,ltc3651-charger" }, /* DEPRECATED */ |
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{ .compatible = "lltc,lt3651-charger" }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(of, lt3651_charger_match); |
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static struct platform_driver lt3651_charger_driver = { |
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.probe = lt3651_charger_probe, |
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.driver = { |
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.name = "lt3651-charger", |
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.of_match_table = lt3651_charger_match, |
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}, |
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}; |
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module_platform_driver(lt3651_charger_driver); |
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MODULE_AUTHOR("Mike Looijmans <[email protected]>"); |
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MODULE_DESCRIPTION("Driver for LT3651 charger"); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS("platform:lt3651-charger");
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