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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 | .type_invert = true, | |
142 | .init_ack_masked = true, | |
143 | .clear_on_unmask = true, | |
144 | }; | |
145 | ||
146 | static const struct regmap_config max77650_regmap_config = { | |
147 | .name = "max77650", | |
148 | .reg_bits = 8, | |
149 | .val_bits = 8, | |
150 | }; | |
151 | ||
152 | static 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 | ||
215 | static const struct of_device_id max77650_of_match[] = { | |
216 | { .compatible = "maxim,max77650" }, | |
217 | { } | |
218 | }; | |
219 | MODULE_DEVICE_TABLE(of, max77650_of_match); | |
220 | ||
221 | static 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 | }; | |
228 | module_i2c_driver(max77650_i2c_driver); | |
229 | ||
230 | MODULE_DESCRIPTION("MAXIM 77650/77651 multi-function core driver"); | |
231 | MODULE_AUTHOR("Bartosz Golaszewski <bgolaszewski@baylibre.com>"); | |
232 | MODULE_LICENSE("GPL v2"); |