1 // SPDX-License-Identifier: GPL-2.0-only 2 #include <linux/i2c.h> 3 #include <linux/mfd/core.h> 4 #include <linux/module.h> 5 #include <linux/notifier.h> 6 #include <linux/of.h> 7 #include <linux/platform_device.h> 8 #include <linux/reboot.h> 9 #include <linux/regmap.h> 10 11 #include <linux/mfd/88pm886.h> 12 13 static const struct regmap_config pm886_regmap_config = { 14 .reg_bits = 8, 15 .val_bits = 8, 16 .max_register = PM886_REG_RTC_SPARE6, 17 }; 18 19 static struct regmap_irq pm886_regmap_irqs[] = { 20 REGMAP_IRQ_REG(PM886_IRQ_ONKEY, 0, PM886_INT_ENA1_ONKEY), 21 }; 22 23 static struct regmap_irq_chip pm886_regmap_irq_chip = { 24 .name = "88pm886", 25 .irqs = pm886_regmap_irqs, 26 .num_irqs = ARRAY_SIZE(pm886_regmap_irqs), 27 .num_regs = 4, 28 .status_base = PM886_REG_INT_STATUS1, 29 .ack_base = PM886_REG_INT_STATUS1, 30 .unmask_base = PM886_REG_INT_ENA_1, 31 }; 32 33 static struct resource pm886_onkey_resources[] = { 34 DEFINE_RES_IRQ_NAMED(PM886_IRQ_ONKEY, "88pm886-onkey"), 35 }; 36 37 static struct mfd_cell pm886_devs[] = { 38 MFD_CELL_RES("88pm886-onkey", pm886_onkey_resources), 39 MFD_CELL_NAME("88pm886-regulator"), 40 }; 41 42 static int pm886_power_off_handler(struct sys_off_data *sys_off_data) 43 { 44 struct pm886_chip *chip = sys_off_data->cb_data; 45 struct regmap *regmap = chip->regmap; 46 struct device *dev = &chip->client->dev; 47 int err; 48 49 err = regmap_update_bits(regmap, PM886_REG_MISC_CONFIG1, PM886_SW_PDOWN, PM886_SW_PDOWN); 50 if (err) { 51 dev_err(dev, "Failed to power off the device: %d\n", err); 52 return NOTIFY_BAD; 53 } 54 return NOTIFY_DONE; 55 } 56 57 static int pm886_setup_irq(struct pm886_chip *chip, 58 struct regmap_irq_chip_data **irq_data) 59 { 60 struct regmap *regmap = chip->regmap; 61 struct device *dev = &chip->client->dev; 62 int err; 63 64 /* Set interrupt clearing mode to clear on write. */ 65 err = regmap_update_bits(regmap, PM886_REG_MISC_CONFIG2, 66 PM886_INT_INV | PM886_INT_CLEAR | PM886_INT_MASK_MODE, 67 PM886_INT_WC); 68 if (err) { 69 dev_err(dev, "Failed to set interrupt clearing mode: %d\n", err); 70 return err; 71 } 72 73 err = devm_regmap_add_irq_chip(dev, regmap, chip->client->irq, 74 IRQF_ONESHOT, 0, &pm886_regmap_irq_chip, 75 irq_data); 76 if (err) { 77 dev_err(dev, "Failed to request IRQ: %d\n", err); 78 return err; 79 } 80 81 return 0; 82 } 83 84 static int pm886_probe(struct i2c_client *client) 85 { 86 struct regmap_irq_chip_data *irq_data; 87 struct device *dev = &client->dev; 88 struct pm886_chip *chip; 89 struct regmap *regmap; 90 unsigned int chip_id; 91 int err; 92 93 chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL); 94 if (!chip) 95 return -ENOMEM; 96 97 chip->client = client; 98 chip->chip_id = (uintptr_t)device_get_match_data(dev); 99 i2c_set_clientdata(client, chip); 100 101 regmap = devm_regmap_init_i2c(client, &pm886_regmap_config); 102 if (IS_ERR(regmap)) 103 return dev_err_probe(dev, PTR_ERR(regmap), "Failed to initialize regmap\n"); 104 chip->regmap = regmap; 105 106 err = regmap_read(regmap, PM886_REG_ID, &chip_id); 107 if (err) 108 return dev_err_probe(dev, err, "Failed to read chip ID\n"); 109 110 if (chip->chip_id != chip_id) 111 return dev_err_probe(dev, -EINVAL, "Unsupported chip: 0x%x\n", chip_id); 112 113 err = pm886_setup_irq(chip, &irq_data); 114 if (err) 115 return err; 116 117 err = devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE, pm886_devs, ARRAY_SIZE(pm886_devs), 118 NULL, 0, regmap_irq_get_domain(irq_data)); 119 if (err) 120 return dev_err_probe(dev, err, "Failed to add devices\n"); 121 122 err = devm_register_power_off_handler(dev, pm886_power_off_handler, chip); 123 if (err) 124 return dev_err_probe(dev, err, "Failed to register power off handler\n"); 125 126 device_init_wakeup(dev, device_property_read_bool(dev, "wakeup-source")); 127 128 return 0; 129 } 130 131 static const struct of_device_id pm886_of_match[] = { 132 { .compatible = "marvell,88pm886-a1", .data = (void *)PM886_A1_CHIP_ID }, 133 { } 134 }; 135 MODULE_DEVICE_TABLE(of, pm886_of_match); 136 137 static struct i2c_driver pm886_i2c_driver = { 138 .driver = { 139 .name = "88pm886", 140 .of_match_table = pm886_of_match, 141 }, 142 .probe = pm886_probe, 143 }; 144 module_i2c_driver(pm886_i2c_driver); 145 146 MODULE_DESCRIPTION("Marvell 88PM886 PMIC driver"); 147 MODULE_AUTHOR("Karel Balej <balejk@matfyz.cz>"); 148 MODULE_LICENSE("GPL"); 149