xref: /openbmc/linux/drivers/mfd/max77650.c (revision 9816d859)
1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // Copyright (C) 2018 BayLibre SAS
4 // Author: Bartosz Golaszewski <bgolaszewski@baylibre.com>
5 //
6 // Core MFD driver for MAXIM 77650/77651 charger/power-supply.
7 // Programming manual: https://pdfserv.maximintegrated.com/en/an/AN6428.pdf
8 
9 #include <linux/i2c.h>
10 #include <linux/interrupt.h>
11 #include <linux/irq.h>
12 #include <linux/mfd/core.h>
13 #include <linux/mfd/max77650.h>
14 #include <linux/module.h>
15 #include <linux/of.h>
16 #include <linux/regmap.h>
17 
18 #define MAX77650_INT_GPI_F_MSK		BIT(0)
19 #define MAX77650_INT_GPI_R_MSK		BIT(1)
20 #define MAX77650_INT_GPI_MSK \
21 			(MAX77650_INT_GPI_F_MSK | MAX77650_INT_GPI_R_MSK)
22 #define MAX77650_INT_nEN_F_MSK		BIT(2)
23 #define MAX77650_INT_nEN_R_MSK		BIT(3)
24 #define MAX77650_INT_TJAL1_R_MSK	BIT(4)
25 #define MAX77650_INT_TJAL2_R_MSK	BIT(5)
26 #define MAX77650_INT_DOD_R_MSK		BIT(6)
27 
28 #define MAX77650_INT_THM_MSK		BIT(0)
29 #define MAX77650_INT_CHG_MSK		BIT(1)
30 #define MAX77650_INT_CHGIN_MSK		BIT(2)
31 #define MAX77650_INT_TJ_REG_MSK		BIT(3)
32 #define MAX77650_INT_CHGIN_CTRL_MSK	BIT(4)
33 #define MAX77650_INT_SYS_CTRL_MSK	BIT(5)
34 #define MAX77650_INT_SYS_CNFG_MSK	BIT(6)
35 
36 #define MAX77650_INT_GLBL_OFFSET	0
37 #define MAX77650_INT_CHG_OFFSET		1
38 
39 #define MAX77650_SBIA_LPM_MASK		BIT(5)
40 #define MAX77650_SBIA_LPM_DISABLED	0x00
41 
42 enum {
43 	MAX77650_INT_GPI,
44 	MAX77650_INT_nEN_F,
45 	MAX77650_INT_nEN_R,
46 	MAX77650_INT_TJAL1_R,
47 	MAX77650_INT_TJAL2_R,
48 	MAX77650_INT_DOD_R,
49 	MAX77650_INT_THM,
50 	MAX77650_INT_CHG,
51 	MAX77650_INT_CHGIN,
52 	MAX77650_INT_TJ_REG,
53 	MAX77650_INT_CHGIN_CTRL,
54 	MAX77650_INT_SYS_CTRL,
55 	MAX77650_INT_SYS_CNFG,
56 };
57 
58 static const struct resource max77650_charger_resources[] = {
59 	DEFINE_RES_IRQ_NAMED(MAX77650_INT_CHG, "CHG"),
60 	DEFINE_RES_IRQ_NAMED(MAX77650_INT_CHGIN, "CHGIN"),
61 };
62 
63 static const struct resource max77650_gpio_resources[] = {
64 	DEFINE_RES_IRQ_NAMED(MAX77650_INT_GPI, "GPI"),
65 };
66 
67 static const struct resource max77650_onkey_resources[] = {
68 	DEFINE_RES_IRQ_NAMED(MAX77650_INT_nEN_F, "nEN_F"),
69 	DEFINE_RES_IRQ_NAMED(MAX77650_INT_nEN_R, "nEN_R"),
70 };
71 
72 static const struct mfd_cell max77650_cells[] = {
73 	{
74 		.name		= "max77650-regulator",
75 		.of_compatible	= "maxim,max77650-regulator",
76 	}, {
77 		.name		= "max77650-charger",
78 		.of_compatible	= "maxim,max77650-charger",
79 		.resources	= max77650_charger_resources,
80 		.num_resources	= ARRAY_SIZE(max77650_charger_resources),
81 	}, {
82 		.name		= "max77650-gpio",
83 		.of_compatible	= "maxim,max77650-gpio",
84 		.resources	= max77650_gpio_resources,
85 		.num_resources	= ARRAY_SIZE(max77650_gpio_resources),
86 	}, {
87 		.name		= "max77650-led",
88 		.of_compatible	= "maxim,max77650-led",
89 	}, {
90 		.name		= "max77650-onkey",
91 		.of_compatible	= "maxim,max77650-onkey",
92 		.resources	= max77650_onkey_resources,
93 		.num_resources	= ARRAY_SIZE(max77650_onkey_resources),
94 	},
95 };
96 
97 static const struct regmap_irq max77650_irqs[] = {
98 	[MAX77650_INT_GPI] = {
99 		.reg_offset = MAX77650_INT_GLBL_OFFSET,
100 		.mask = MAX77650_INT_GPI_MSK,
101 		.type = {
102 			.type_falling_val = MAX77650_INT_GPI_F_MSK,
103 			.type_rising_val = MAX77650_INT_GPI_R_MSK,
104 			.types_supported = IRQ_TYPE_EDGE_BOTH,
105 		},
106 	},
107 	REGMAP_IRQ_REG(MAX77650_INT_nEN_F,
108 		       MAX77650_INT_GLBL_OFFSET, MAX77650_INT_nEN_F_MSK),
109 	REGMAP_IRQ_REG(MAX77650_INT_nEN_R,
110 		       MAX77650_INT_GLBL_OFFSET, MAX77650_INT_nEN_R_MSK),
111 	REGMAP_IRQ_REG(MAX77650_INT_TJAL1_R,
112 		       MAX77650_INT_GLBL_OFFSET, MAX77650_INT_TJAL1_R_MSK),
113 	REGMAP_IRQ_REG(MAX77650_INT_TJAL2_R,
114 		       MAX77650_INT_GLBL_OFFSET, MAX77650_INT_TJAL2_R_MSK),
115 	REGMAP_IRQ_REG(MAX77650_INT_DOD_R,
116 		       MAX77650_INT_GLBL_OFFSET, MAX77650_INT_DOD_R_MSK),
117 	REGMAP_IRQ_REG(MAX77650_INT_THM,
118 		       MAX77650_INT_CHG_OFFSET, MAX77650_INT_THM_MSK),
119 	REGMAP_IRQ_REG(MAX77650_INT_CHG,
120 		       MAX77650_INT_CHG_OFFSET, MAX77650_INT_CHG_MSK),
121 	REGMAP_IRQ_REG(MAX77650_INT_CHGIN,
122 		       MAX77650_INT_CHG_OFFSET, MAX77650_INT_CHGIN_MSK),
123 	REGMAP_IRQ_REG(MAX77650_INT_TJ_REG,
124 		       MAX77650_INT_CHG_OFFSET, MAX77650_INT_TJ_REG_MSK),
125 	REGMAP_IRQ_REG(MAX77650_INT_CHGIN_CTRL,
126 		       MAX77650_INT_CHG_OFFSET, MAX77650_INT_CHGIN_CTRL_MSK),
127 	REGMAP_IRQ_REG(MAX77650_INT_SYS_CTRL,
128 		       MAX77650_INT_CHG_OFFSET, MAX77650_INT_SYS_CTRL_MSK),
129 	REGMAP_IRQ_REG(MAX77650_INT_SYS_CNFG,
130 		       MAX77650_INT_CHG_OFFSET, MAX77650_INT_SYS_CNFG_MSK),
131 };
132 
133 static const struct regmap_irq_chip max77650_irq_chip = {
134 	.name			= "max77650-irq",
135 	.irqs			= max77650_irqs,
136 	.num_irqs		= ARRAY_SIZE(max77650_irqs),
137 	.num_regs		= 2,
138 	.status_base		= MAX77650_REG_INT_GLBL,
139 	.mask_base		= MAX77650_REG_INTM_GLBL,
140 	.type_in_mask		= true,
141 	.init_ack_masked	= true,
142 	.clear_on_unmask	= true,
143 };
144 
145 static const struct regmap_config max77650_regmap_config = {
146 	.name		= "max77650",
147 	.reg_bits	= 8,
148 	.val_bits	= 8,
149 };
150 
max77650_i2c_probe(struct i2c_client * i2c)151 static int max77650_i2c_probe(struct i2c_client *i2c)
152 {
153 	struct regmap_irq_chip_data *irq_data;
154 	struct device *dev = &i2c->dev;
155 	struct irq_domain *domain;
156 	struct regmap *map;
157 	unsigned int val;
158 	int rv, id;
159 
160 	map = devm_regmap_init_i2c(i2c, &max77650_regmap_config);
161 	if (IS_ERR(map)) {
162 		dev_err(dev, "Unable to initialise I2C Regmap\n");
163 		return PTR_ERR(map);
164 	}
165 
166 	rv = regmap_read(map, MAX77650_REG_CID, &val);
167 	if (rv) {
168 		dev_err(dev, "Unable to read Chip ID\n");
169 		return rv;
170 	}
171 
172 	id = MAX77650_CID_BITS(val);
173 	switch (id) {
174 	case MAX77650_CID_77650A:
175 	case MAX77650_CID_77650C:
176 	case MAX77650_CID_77651A:
177 	case MAX77650_CID_77651B:
178 		break;
179 	default:
180 		dev_err(dev, "Chip not supported - ID: 0x%02x\n", id);
181 		return -ENODEV;
182 	}
183 
184 	/*
185 	 * This IC has a low-power mode which reduces the quiescent current
186 	 * consumption to ~5.6uA but is only suitable for systems consuming
187 	 * less than ~2mA. Since this is not likely the case even on
188 	 * linux-based wearables - keep the chip in normal power mode.
189 	 */
190 	rv = regmap_update_bits(map,
191 				MAX77650_REG_CNFG_GLBL,
192 				MAX77650_SBIA_LPM_MASK,
193 				MAX77650_SBIA_LPM_DISABLED);
194 	if (rv) {
195 		dev_err(dev, "Unable to change the power mode\n");
196 		return rv;
197 	}
198 
199 	rv = devm_regmap_add_irq_chip(dev, map, i2c->irq,
200 				      IRQF_ONESHOT | IRQF_SHARED, 0,
201 				      &max77650_irq_chip, &irq_data);
202 	if (rv) {
203 		dev_err(dev, "Unable to add Regmap IRQ chip\n");
204 		return rv;
205 	}
206 
207 	domain = regmap_irq_get_domain(irq_data);
208 
209 	return devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE,
210 				    max77650_cells, ARRAY_SIZE(max77650_cells),
211 				    NULL, 0, domain);
212 }
213 
214 static const struct of_device_id max77650_of_match[] = {
215 	{ .compatible = "maxim,max77650" },
216 	{ }
217 };
218 MODULE_DEVICE_TABLE(of, max77650_of_match);
219 
220 static struct i2c_driver max77650_i2c_driver = {
221 	.driver = {
222 		.name = "max77650",
223 		.of_match_table = max77650_of_match,
224 	},
225 	.probe = max77650_i2c_probe,
226 };
227 module_i2c_driver(max77650_i2c_driver);
228 
229 MODULE_DESCRIPTION("MAXIM 77650/77651 multi-function core driver");
230 MODULE_AUTHOR("Bartosz Golaszewski <bgolaszewski@baylibre.com>");
231 MODULE_LICENSE("GPL v2");
232