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review.shift-gmbh.com / SHIFTPHONES / mainline / linux / f458488425f1cc9a396aa1d09bb00c48783936da / . / drivers / mfd / max77650.c
blob: 60e07aca6ae59ef51011188171847e5e1de1e985 [file] [log] [blame]
Bartosz Golaszewskid0f60332019-04-23 11:04:46 +0200[diff] [blame]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
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 .type_invert = true,
142 .init_ack_masked = true,
143 .clear_on_unmask = true,
144};
145
146static const struct regmap_config max77650_regmap_config = {
147 .name = "max77650",
148 .reg_bits = 8,
149 .val_bits = 8,
150};
151
152static int max77650_i2c_probe(struct i2c_client *i2c)
153{
154 struct regmap_irq_chip_data *irq_data;
155 struct device *dev = &i2c->dev;
156 struct irq_domain *domain;
157 struct regmap *map;
158 unsigned int val;
159 int rv, id;
160
161 map = devm_regmap_init_i2c(i2c, &max77650_regmap_config);
162 if (IS_ERR(map)) {
163 dev_err(dev, "Unable to initialise I2C Regmap\n");
164 return PTR_ERR(map);
165 }
166
167 rv = regmap_read(map, MAX77650_REG_CID, &val);
168 if (rv) {
169 dev_err(dev, "Unable to read Chip ID\n");
170 return rv;
171 }
172
173 id = MAX77650_CID_BITS(val);
174 switch (id) {
175 case MAX77650_CID_77650A:
176 case MAX77650_CID_77650C:
177 case MAX77650_CID_77651A:
178 case MAX77650_CID_77651B:
179 break;
180 default:
181 dev_err(dev, "Chip not supported - ID: 0x%02x\n", id);
182 return -ENODEV;
183 }
184
185 /*
186 * This IC has a low-power mode which reduces the quiescent current
187 * consumption to ~5.6uA but is only suitable for systems consuming
188 * less than ~2mA. Since this is not likely the case even on
189 * linux-based wearables - keep the chip in normal power mode.
190 */
191 rv = regmap_update_bits(map,
192 MAX77650_REG_CNFG_GLBL,
193 MAX77650_SBIA_LPM_MASK,
194 MAX77650_SBIA_LPM_DISABLED);
195 if (rv) {
196 dev_err(dev, "Unable to change the power mode\n");
197 return rv;
198 }
199
200 rv = devm_regmap_add_irq_chip(dev, map, i2c->irq,
201 IRQF_ONESHOT | IRQF_SHARED, 0,
202 &max77650_irq_chip, &irq_data);
203 if (rv) {
204 dev_err(dev, "Unable to add Regmap IRQ chip\n");
205 return rv;
206 }
207
208 domain = regmap_irq_get_domain(irq_data);
209
210 return devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE,
211 max77650_cells, ARRAY_SIZE(max77650_cells),
212 NULL, 0, domain);
213}
214
215static const struct of_device_id max77650_of_match[] = {
216 { .compatible = "maxim,max77650" },
217 { }
218};
219MODULE_DEVICE_TABLE(of, max77650_of_match);
220
221static struct i2c_driver max77650_i2c_driver = {
222 .driver = {
223 .name = "max77650",
224 .of_match_table = of_match_ptr(max77650_of_match),
225 },
226 .probe_new = max77650_i2c_probe,
227};
228module_i2c_driver(max77650_i2c_driver);
229
230MODULE_DESCRIPTION("MAXIM 77650/77651 multi-function core driver");
231MODULE_AUTHOR("Bartosz Golaszewski <bgolaszewski@baylibre.com>");
232MODULE_LICENSE("GPL v2");