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
pm886_power_off_handler(struct sys_off_data * sys_off_data)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
pm886_setup_irq(struct pm886_chip * chip,struct regmap_irq_chip_data ** irq_data)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
pm886_probe(struct i2c_client * client)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