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1// SPDX-License-Identifier: GPL-2.0
2//
3// Copyright (C) 2018 BayLibre SAS
4// Author: Bartosz Golaszewski <[email protected]>
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
42enum {
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
58static 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
63static const struct resource max77650_gpio_resources[] = {
64 DEFINE_RES_IRQ_NAMED(MAX77650_INT_GPI, "GPI"),
65};
66
67static 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
72static 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
97static 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
133static 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
145static const struct regmap_config max77650_regmap_config = {
146 .name = "max77650",
147 .reg_bits = 8,
148 .val_bits = 8,
149};
150
151static 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
214static const struct of_device_id max77650_of_match[] = {
215 { .compatible = "maxim,max77650" },
216 { }
217};
218MODULE_DEVICE_TABLE(of, max77650_of_match);
219
220static 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};
227module_i2c_driver(max77650_i2c_driver);
228
229MODULE_DESCRIPTION("MAXIM 77650/77651 multi-function core driver");
230MODULE_AUTHOR("Bartosz Golaszewski <[email protected]>");
231MODULE_LICENSE("GPL v2");