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 const struct regmap_irq pm886_regmap_irqs[] = { 20 REGMAP_IRQ_REG(PM886_IRQ_ONKEY, 0, PM886_INT_ENA1_ONKEY), 21 }; 22 23 static const 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 const struct resource pm886_onkey_resources[] = { 34 DEFINE_RES_IRQ_NAMED(PM886_IRQ_ONKEY, "88pm886-onkey"), 35 }; 36 37 static const struct mfd_cell pm886_devs[] = { 38 MFD_CELL_NAME("88pm886-gpadc"), 39 MFD_CELL_RES("88pm886-onkey", pm886_onkey_resources), 40 MFD_CELL_NAME("88pm886-regulator"), 41 MFD_CELL_NAME("88pm886-rtc"), 42 }; 43 44 static int pm886_power_off_handler(struct sys_off_data *sys_off_data) 45 { 46 struct pm886_chip *chip = sys_off_data->cb_data; 47 struct regmap *regmap = chip->regmap; 48 struct device *dev = &chip->client->dev; 49 int err; 50 51 err = regmap_update_bits(regmap, PM886_REG_MISC_CONFIG1, PM886_SW_PDOWN, PM886_SW_PDOWN); 52 if (err) { 53 dev_err(dev, "Failed to power off the device: %d\n", err); 54 return NOTIFY_BAD; 55 } 56 return NOTIFY_DONE; 57 } 58 59 static int pm886_setup_irq(struct pm886_chip *chip, 60 struct regmap_irq_chip_data **irq_data) 61 { 62 struct regmap *regmap = chip->regmap; 63 struct device *dev = &chip->client->dev; 64 int err; 65 66 /* Set interrupt clearing mode to clear on write. */ 67 err = regmap_update_bits(regmap, PM886_REG_MISC_CONFIG2, 68 PM886_INT_INV | PM886_INT_CLEAR | PM886_INT_MASK_MODE, 69 PM886_INT_WC); 70 if (err) { 71 dev_err(dev, "Failed to set interrupt clearing mode: %d\n", err); 72 return err; 73 } 74 75 err = devm_regmap_add_irq_chip(dev, regmap, chip->client->irq, 76 IRQF_ONESHOT, 0, &pm886_regmap_irq_chip, 77 irq_data); 78 if (err) { 79 dev_err(dev, "Failed to request IRQ: %d\n", err); 80 return err; 81 } 82 83 return 0; 84 } 85 86 static int pm886_probe(struct i2c_client *client) 87 { 88 struct regmap_irq_chip_data *irq_data; 89 struct device *dev = &client->dev; 90 struct pm886_chip *chip; 91 struct regmap *regmap; 92 unsigned int chip_id; 93 int err; 94 95 chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL); 96 if (!chip) 97 return -ENOMEM; 98 99 chip->client = client; 100 chip->chip_id = (uintptr_t)device_get_match_data(dev); 101 i2c_set_clientdata(client, chip); 102 103 regmap = devm_regmap_init_i2c(client, &pm886_regmap_config); 104 if (IS_ERR(regmap)) 105 return dev_err_probe(dev, PTR_ERR(regmap), "Failed to initialize regmap\n"); 106 chip->regmap = regmap; 107 108 err = regmap_read(regmap, PM886_REG_ID, &chip_id); 109 if (err) 110 return dev_err_probe(dev, err, "Failed to read chip ID\n"); 111 112 if (chip->chip_id != chip_id) 113 return dev_err_probe(dev, -EINVAL, "Unsupported chip: 0x%x\n", chip_id); 114 115 err = pm886_setup_irq(chip, &irq_data); 116 if (err) 117 return err; 118 119 err = devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE, pm886_devs, ARRAY_SIZE(pm886_devs), 120 NULL, 0, regmap_irq_get_domain(irq_data)); 121 if (err) 122 return dev_err_probe(dev, err, "Failed to add devices\n"); 123 124 err = devm_register_power_off_handler(dev, pm886_power_off_handler, chip); 125 if (err) 126 return dev_err_probe(dev, err, "Failed to register power off handler\n"); 127 128 if (device_property_read_bool(dev, "wakeup-source")) { 129 err = devm_device_init_wakeup(dev); 130 if (err) 131 return dev_err_probe(dev, err, "Failed to init wakeup\n"); 132 } 133 134 return 0; 135 } 136 137 static const struct of_device_id pm886_of_match[] = { 138 { .compatible = "marvell,88pm886-a1", .data = (void *)PM886_A1_CHIP_ID }, 139 { } 140 }; 141 MODULE_DEVICE_TABLE(of, pm886_of_match); 142 143 static struct i2c_driver pm886_i2c_driver = { 144 .driver = { 145 .name = "88pm886", 146 .of_match_table = pm886_of_match, 147 }, 148 .probe = pm886_probe, 149 }; 150 module_i2c_driver(pm886_i2c_driver); 151 152 MODULE_DESCRIPTION("Marvell 88PM886 PMIC driver"); 153 MODULE_AUTHOR("Karel Balej <balejk@matfyz.cz>"); 154 MODULE_LICENSE("GPL"); 155