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 MFD_CELL_NAME("88pm886-rtc"), 41 }; 42 43 static int pm886_power_off_handler(struct sys_off_data *sys_off_data) 44 { 45 struct pm886_chip *chip = sys_off_data->cb_data; 46 struct regmap *regmap = chip->regmap; 47 struct device *dev = &chip->client->dev; 48 int err; 49 50 err = regmap_update_bits(regmap, PM886_REG_MISC_CONFIG1, PM886_SW_PDOWN, PM886_SW_PDOWN); 51 if (err) { 52 dev_err(dev, "Failed to power off the device: %d\n", err); 53 return NOTIFY_BAD; 54 } 55 return NOTIFY_DONE; 56 } 57 58 static int pm886_setup_irq(struct pm886_chip *chip, 59 struct regmap_irq_chip_data **irq_data) 60 { 61 struct regmap *regmap = chip->regmap; 62 struct device *dev = &chip->client->dev; 63 int err; 64 65 /* Set interrupt clearing mode to clear on write. */ 66 err = regmap_update_bits(regmap, PM886_REG_MISC_CONFIG2, 67 PM886_INT_INV | PM886_INT_CLEAR | PM886_INT_MASK_MODE, 68 PM886_INT_WC); 69 if (err) { 70 dev_err(dev, "Failed to set interrupt clearing mode: %d\n", err); 71 return err; 72 } 73 74 err = devm_regmap_add_irq_chip(dev, regmap, chip->client->irq, 75 IRQF_ONESHOT, 0, &pm886_regmap_irq_chip, 76 irq_data); 77 if (err) { 78 dev_err(dev, "Failed to request IRQ: %d\n", err); 79 return err; 80 } 81 82 return 0; 83 } 84 85 static int pm886_probe(struct i2c_client *client) 86 { 87 struct regmap_irq_chip_data *irq_data; 88 struct device *dev = &client->dev; 89 struct pm886_chip *chip; 90 struct regmap *regmap; 91 unsigned int chip_id; 92 int err; 93 94 chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL); 95 if (!chip) 96 return -ENOMEM; 97 98 chip->client = client; 99 chip->chip_id = (uintptr_t)device_get_match_data(dev); 100 i2c_set_clientdata(client, chip); 101 102 regmap = devm_regmap_init_i2c(client, &pm886_regmap_config); 103 if (IS_ERR(regmap)) 104 return dev_err_probe(dev, PTR_ERR(regmap), "Failed to initialize regmap\n"); 105 chip->regmap = regmap; 106 107 err = regmap_read(regmap, PM886_REG_ID, &chip_id); 108 if (err) 109 return dev_err_probe(dev, err, "Failed to read chip ID\n"); 110 111 if (chip->chip_id != chip_id) 112 return dev_err_probe(dev, -EINVAL, "Unsupported chip: 0x%x\n", chip_id); 113 114 err = pm886_setup_irq(chip, &irq_data); 115 if (err) 116 return err; 117 118 err = devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE, pm886_devs, ARRAY_SIZE(pm886_devs), 119 NULL, 0, regmap_irq_get_domain(irq_data)); 120 if (err) 121 return dev_err_probe(dev, err, "Failed to add devices\n"); 122 123 err = devm_register_power_off_handler(dev, pm886_power_off_handler, chip); 124 if (err) 125 return dev_err_probe(dev, err, "Failed to register power off handler\n"); 126 127 device_init_wakeup(dev, device_property_read_bool(dev, "wakeup-source")); 128 129 return 0; 130 } 131 132 static const struct of_device_id pm886_of_match[] = { 133 { .compatible = "marvell,88pm886-a1", .data = (void *)PM886_A1_CHIP_ID }, 134 { } 135 }; 136 MODULE_DEVICE_TABLE(of, pm886_of_match); 137 138 static struct i2c_driver pm886_i2c_driver = { 139 .driver = { 140 .name = "88pm886", 141 .of_match_table = pm886_of_match, 142 }, 143 .probe = pm886_probe, 144 }; 145 module_i2c_driver(pm886_i2c_driver); 146 147 MODULE_DESCRIPTION("Marvell 88PM886 PMIC driver"); 148 MODULE_AUTHOR("Karel Balej <balejk@matfyz.cz>"); 149 MODULE_LICENSE("GPL"); 150