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_config pm886_regmap_battery_config = { 20 .reg_bits = 8, 21 .val_bits = 8, 22 .max_register = PM886_REG_CLS_CONFIG1, 23 }; 24 25 static const struct regmap_irq pm886_regmap_irqs[] = { 26 REGMAP_IRQ_REG(PM886_IRQ_ONKEY, 0, PM886_INT_ENA1_ONKEY), 27 }; 28 29 static const struct regmap_irq_chip pm886_regmap_irq_chip = { 30 .name = "88pm886", 31 .irqs = pm886_regmap_irqs, 32 .num_irqs = ARRAY_SIZE(pm886_regmap_irqs), 33 .num_regs = 4, 34 .status_base = PM886_REG_INT_STATUS1, 35 .ack_base = PM886_REG_INT_STATUS1, 36 .unmask_base = PM886_REG_INT_ENA_1, 37 }; 38 39 static const struct resource pm886_onkey_resources[] = { 40 DEFINE_RES_IRQ_NAMED(PM886_IRQ_ONKEY, "88pm886-onkey"), 41 }; 42 43 static const struct mfd_cell pm886_devs[] = { 44 MFD_CELL_NAME("88pm886-gpadc"), 45 MFD_CELL_RES("88pm886-onkey", pm886_onkey_resources), 46 MFD_CELL_NAME("88pm886-regulator"), 47 MFD_CELL_NAME("88pm886-rtc"), 48 }; 49 50 static int pm886_power_off_handler(struct sys_off_data *sys_off_data) 51 { 52 struct pm886_chip *chip = sys_off_data->cb_data; 53 struct regmap *regmap = chip->regmap; 54 struct device *dev = &chip->client->dev; 55 int err; 56 57 err = regmap_update_bits(regmap, PM886_REG_MISC_CONFIG1, PM886_SW_PDOWN, PM886_SW_PDOWN); 58 if (err) { 59 dev_err(dev, "Failed to power off the device: %d\n", err); 60 return NOTIFY_BAD; 61 } 62 return NOTIFY_DONE; 63 } 64 65 static int pm886_setup_irq(struct pm886_chip *chip, 66 struct regmap_irq_chip_data **irq_data) 67 { 68 struct regmap *regmap = chip->regmap; 69 struct device *dev = &chip->client->dev; 70 int err; 71 72 /* Set interrupt clearing mode to clear on write. */ 73 err = regmap_update_bits(regmap, PM886_REG_MISC_CONFIG2, 74 PM886_INT_INV | PM886_INT_CLEAR | PM886_INT_MASK_MODE, 75 PM886_INT_WC); 76 if (err) { 77 dev_err(dev, "Failed to set interrupt clearing mode: %d\n", err); 78 return err; 79 } 80 81 err = devm_regmap_add_irq_chip(dev, regmap, chip->client->irq, 82 IRQF_ONESHOT, 0, &pm886_regmap_irq_chip, 83 irq_data); 84 if (err) { 85 dev_err(dev, "Failed to request IRQ: %d\n", err); 86 return err; 87 } 88 89 return 0; 90 } 91 92 static int pm886_probe(struct i2c_client *client) 93 { 94 struct regmap *regmap, *regmap_battery; 95 struct regmap_irq_chip_data *irq_data; 96 struct device *dev = &client->dev; 97 struct i2c_client *battery_page; 98 struct pm886_chip *chip; 99 unsigned int chip_id; 100 int err; 101 102 chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL); 103 if (!chip) 104 return -ENOMEM; 105 106 chip->client = client; 107 chip->chip_id = (uintptr_t)device_get_match_data(dev); 108 i2c_set_clientdata(client, chip); 109 110 regmap = devm_regmap_init_i2c(client, &pm886_regmap_config); 111 if (IS_ERR(regmap)) 112 return dev_err_probe(dev, PTR_ERR(regmap), "Failed to initialize regmap\n"); 113 chip->regmap = regmap; 114 115 err = regmap_read(regmap, PM886_REG_ID, &chip_id); 116 if (err) 117 return dev_err_probe(dev, err, "Failed to read chip ID\n"); 118 119 if (chip->chip_id != chip_id) 120 return dev_err_probe(dev, -EINVAL, "Unsupported chip: 0x%x\n", chip_id); 121 122 battery_page = devm_i2c_new_dummy_device(dev, client->adapter, 123 client->addr + PM886_PAGE_OFFSET_BATTERY); 124 if (IS_ERR(battery_page)) 125 return dev_err_probe(dev, PTR_ERR(battery_page), 126 "Failed to initialize battery page\n"); 127 128 regmap_battery = devm_regmap_init_i2c(battery_page, &pm886_regmap_battery_config); 129 if (IS_ERR(regmap_battery)) 130 return dev_err_probe(dev, PTR_ERR(regmap_battery), 131 "Failed to initialize battery regmap\n"); 132 chip->regmap_battery = regmap_battery; 133 134 err = pm886_setup_irq(chip, &irq_data); 135 if (err) 136 return err; 137 138 err = devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE, pm886_devs, ARRAY_SIZE(pm886_devs), 139 NULL, 0, regmap_irq_get_domain(irq_data)); 140 if (err) 141 return dev_err_probe(dev, err, "Failed to add devices\n"); 142 143 err = devm_register_power_off_handler(dev, pm886_power_off_handler, chip); 144 if (err) 145 return dev_err_probe(dev, err, "Failed to register power off handler\n"); 146 147 if (device_property_read_bool(dev, "wakeup-source")) { 148 err = devm_device_init_wakeup(dev); 149 if (err) 150 return dev_err_probe(dev, err, "Failed to init wakeup\n"); 151 } 152 153 return 0; 154 } 155 156 static const struct of_device_id pm886_of_match[] = { 157 { .compatible = "marvell,88pm886-a1", .data = (void *)PM886_A1_CHIP_ID }, 158 { } 159 }; 160 MODULE_DEVICE_TABLE(of, pm886_of_match); 161 162 static struct i2c_driver pm886_i2c_driver = { 163 .driver = { 164 .name = "88pm886", 165 .of_match_table = pm886_of_match, 166 }, 167 .probe = pm886_probe, 168 }; 169 module_i2c_driver(pm886_i2c_driver); 170 171 MODULE_DESCRIPTION("Marvell 88PM886 PMIC driver"); 172 MODULE_AUTHOR("Karel Balej <balejk@matfyz.cz>"); 173 MODULE_LICENSE("GPL"); 174