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1// SPDX-License-Identifier: GPL-2.0+2/*3 * Driver for the external-charger IRQ pass-through function of the4 * Intel Bay Trail Crystal Cove PMIC.5 *6 * Note this is NOT a power_supply class driver, it just deals with IRQ7 * pass-through, this requires a separate driver because the PMIC's8 * level 2 interrupt for this must be explicitly acked.9 */10 11#include <linux/interrupt.h>12#include <linux/irq.h>13#include <linux/irqdomain.h>14#include <linux/mfd/intel_soc_pmic.h>15#include <linux/module.h>16#include <linux/platform_device.h>17#include <linux/regmap.h>18 19#define CHGRIRQ_REG 0x0a20#define MCHGRIRQ_REG 0x1721 22struct crystal_cove_charger_data {23 struct mutex buslock; /* irq_bus_lock */24 struct irq_chip irqchip;25 struct regmap *regmap;26 struct irq_domain *irq_domain;27 int irq;28 int charger_irq;29 u8 mask;30 u8 new_mask;31};32 33static irqreturn_t crystal_cove_charger_irq(int irq, void *data)34{35 struct crystal_cove_charger_data *charger = data;36 37 /* No need to read CHGRIRQ_REG as there is only 1 IRQ */38 handle_nested_irq(charger->charger_irq);39 40 /* Ack CHGRIRQ 0 */41 regmap_write(charger->regmap, CHGRIRQ_REG, BIT(0));42 43 return IRQ_HANDLED;44}45 46static void crystal_cove_charger_irq_bus_lock(struct irq_data *data)47{48 struct crystal_cove_charger_data *charger = irq_data_get_irq_chip_data(data);49 50 mutex_lock(&charger->buslock);51}52 53static void crystal_cove_charger_irq_bus_sync_unlock(struct irq_data *data)54{55 struct crystal_cove_charger_data *charger = irq_data_get_irq_chip_data(data);56 57 if (charger->mask != charger->new_mask) {58 regmap_write(charger->regmap, MCHGRIRQ_REG, charger->new_mask);59 charger->mask = charger->new_mask;60 }61 62 mutex_unlock(&charger->buslock);63}64 65static void crystal_cove_charger_irq_unmask(struct irq_data *data)66{67 struct crystal_cove_charger_data *charger = irq_data_get_irq_chip_data(data);68 69 charger->new_mask &= ~BIT(data->hwirq);70}71 72static void crystal_cove_charger_irq_mask(struct irq_data *data)73{74 struct crystal_cove_charger_data *charger = irq_data_get_irq_chip_data(data);75 76 charger->new_mask |= BIT(data->hwirq);77}78 79static void crystal_cove_charger_rm_irq_domain(void *data)80{81 struct crystal_cove_charger_data *charger = data;82 83 irq_domain_remove(charger->irq_domain);84}85 86static int crystal_cove_charger_probe(struct platform_device *pdev)87{88 struct intel_soc_pmic *pmic = dev_get_drvdata(pdev->dev.parent);89 struct crystal_cove_charger_data *charger;90 int ret;91 92 charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL);93 if (!charger)94 return -ENOMEM;95 96 charger->regmap = pmic->regmap;97 mutex_init(&charger->buslock);98 99 charger->irq = platform_get_irq(pdev, 0);100 if (charger->irq < 0)101 return charger->irq;102 103 charger->irq_domain = irq_domain_create_linear(dev_fwnode(pdev->dev.parent), 1,104 &irq_domain_simple_ops, NULL);105 if (!charger->irq_domain)106 return -ENOMEM;107 108 /* Distuingish IRQ domain from others sharing (MFD) the same fwnode */109 irq_domain_update_bus_token(charger->irq_domain, DOMAIN_BUS_WAKEUP);110 111 ret = devm_add_action_or_reset(&pdev->dev, crystal_cove_charger_rm_irq_domain, charger);112 if (ret)113 return ret;114 115 charger->charger_irq = irq_create_mapping(charger->irq_domain, 0);116 if (!charger->charger_irq)117 return -ENOMEM;118 119 charger->irqchip.name = KBUILD_MODNAME;120 charger->irqchip.irq_unmask = crystal_cove_charger_irq_unmask;121 charger->irqchip.irq_mask = crystal_cove_charger_irq_mask;122 charger->irqchip.irq_bus_lock = crystal_cove_charger_irq_bus_lock;123 charger->irqchip.irq_bus_sync_unlock = crystal_cove_charger_irq_bus_sync_unlock;124 125 irq_set_chip_data(charger->charger_irq, charger);126 irq_set_chip_and_handler(charger->charger_irq, &charger->irqchip, handle_simple_irq);127 irq_set_nested_thread(charger->charger_irq, true);128 irq_set_noprobe(charger->charger_irq);129 130 /* Mask the single 2nd level IRQ before enabling the 1st level IRQ */131 charger->mask = charger->new_mask = BIT(0);132 regmap_write(charger->regmap, MCHGRIRQ_REG, charger->mask);133 134 ret = devm_request_threaded_irq(&pdev->dev, charger->irq, NULL,135 crystal_cove_charger_irq,136 IRQF_ONESHOT, KBUILD_MODNAME, charger);137 if (ret)138 return dev_err_probe(&pdev->dev, ret, "requesting irq\n");139 140 return 0;141}142 143static struct platform_driver crystal_cove_charger_driver = {144 .probe = crystal_cove_charger_probe,145 .driver = {146 .name = "crystal_cove_charger",147 },148};149module_platform_driver(crystal_cove_charger_driver);150 151MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com");152MODULE_DESCRIPTION("Intel Bay Trail Crystal Cove external charger IRQ pass-through");153MODULE_LICENSE("GPL");154