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 | |
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(ptr: map)) { |
162 | dev_err(dev, "Unable to initialise I2C Regmap\n" ); |
163 | return PTR_ERR(ptr: map); |
164 | } |
165 | |
166 | rv = regmap_read(map, MAX77650_REG_CID, val: &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, irq: i2c->irq, |
200 | IRQF_ONESHOT | IRQF_SHARED, irq_base: 0, |
201 | chip: &max77650_irq_chip, data: &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(data: irq_data); |
208 | |
209 | return devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE, |
210 | cells: max77650_cells, ARRAY_SIZE(max77650_cells), |
211 | NULL, irq_base: 0, irq_domain: 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 | |