Commit | Line | Data |
---|---|---|
97fb5e8d | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1f26d1c1 TB |
2 | /* Copyright (c) 2013, The Linux Foundation. All rights reserved. |
3 | * Copyright (c) 2015, Sony Mobile Communications Inc. | |
1f26d1c1 TB |
4 | */ |
5 | ||
6 | #include <linux/kernel.h> | |
7 | #include <linux/module.h> | |
8 | #include <linux/slab.h> | |
9 | #include <linux/of.h> | |
10 | #include <linux/regmap.h> | |
11 | #include <linux/of_device.h> | |
12 | #include <linux/platform_device.h> | |
13 | ||
14 | struct qcom_coincell { | |
15 | struct device *dev; | |
16 | struct regmap *regmap; | |
17 | u32 base_addr; | |
18 | }; | |
19 | ||
20 | #define QCOM_COINCELL_REG_RSET 0x44 | |
21 | #define QCOM_COINCELL_REG_VSET 0x45 | |
22 | #define QCOM_COINCELL_REG_ENABLE 0x46 | |
23 | ||
24 | #define QCOM_COINCELL_ENABLE BIT(7) | |
25 | ||
26 | static const int qcom_rset_map[] = { 2100, 1700, 1200, 800 }; | |
27 | static const int qcom_vset_map[] = { 2500, 3200, 3100, 3000 }; | |
28 | /* NOTE: for pm8921 and others, voltage of 2500 is 16 (10000b), not 0 */ | |
29 | ||
30 | /* if enable==0, rset and vset are ignored */ | |
31 | static int qcom_coincell_chgr_config(struct qcom_coincell *chgr, int rset, | |
32 | int vset, bool enable) | |
33 | { | |
34 | int i, j, rc; | |
35 | ||
36 | /* if disabling, just do that and skip other operations */ | |
37 | if (!enable) | |
38 | return regmap_write(chgr->regmap, | |
39 | chgr->base_addr + QCOM_COINCELL_REG_ENABLE, 0); | |
40 | ||
41 | /* find index for current-limiting resistor */ | |
42 | for (i = 0; i < ARRAY_SIZE(qcom_rset_map); i++) | |
43 | if (rset == qcom_rset_map[i]) | |
44 | break; | |
45 | ||
46 | if (i >= ARRAY_SIZE(qcom_rset_map)) { | |
47 | dev_err(chgr->dev, "invalid rset-ohms value %d\n", rset); | |
48 | return -EINVAL; | |
49 | } | |
50 | ||
51 | /* find index for charge voltage */ | |
52 | for (j = 0; j < ARRAY_SIZE(qcom_vset_map); j++) | |
53 | if (vset == qcom_vset_map[j]) | |
54 | break; | |
55 | ||
56 | if (j >= ARRAY_SIZE(qcom_vset_map)) { | |
57 | dev_err(chgr->dev, "invalid vset-millivolts value %d\n", vset); | |
58 | return -EINVAL; | |
59 | } | |
60 | ||
61 | rc = regmap_write(chgr->regmap, | |
62 | chgr->base_addr + QCOM_COINCELL_REG_RSET, i); | |
63 | if (rc) { | |
64 | /* | |
65 | * This is mainly to flag a bad base_addr (reg) from dts. | |
66 | * Other failures writing to the registers should be | |
67 | * extremely rare, or indicative of problems that | |
68 | * should be reported elsewhere (eg. spmi failure). | |
69 | */ | |
70 | dev_err(chgr->dev, "could not write to RSET register\n"); | |
71 | return rc; | |
72 | } | |
73 | ||
74 | rc = regmap_write(chgr->regmap, | |
75 | chgr->base_addr + QCOM_COINCELL_REG_VSET, j); | |
76 | if (rc) | |
77 | return rc; | |
78 | ||
79 | /* set 'enable' register */ | |
80 | return regmap_write(chgr->regmap, | |
81 | chgr->base_addr + QCOM_COINCELL_REG_ENABLE, | |
82 | QCOM_COINCELL_ENABLE); | |
83 | } | |
84 | ||
85 | static int qcom_coincell_probe(struct platform_device *pdev) | |
86 | { | |
87 | struct device_node *node = pdev->dev.of_node; | |
88 | struct qcom_coincell chgr; | |
66b58edf DC |
89 | u32 rset = 0; |
90 | u32 vset = 0; | |
1f26d1c1 TB |
91 | bool enable; |
92 | int rc; | |
93 | ||
94 | chgr.dev = &pdev->dev; | |
95 | ||
96 | chgr.regmap = dev_get_regmap(pdev->dev.parent, NULL); | |
97 | if (!chgr.regmap) { | |
98 | dev_err(chgr.dev, "Unable to get regmap\n"); | |
99 | return -EINVAL; | |
100 | } | |
101 | ||
102 | rc = of_property_read_u32(node, "reg", &chgr.base_addr); | |
103 | if (rc) | |
104 | return rc; | |
105 | ||
106 | enable = !of_property_read_bool(node, "qcom,charger-disable"); | |
107 | ||
108 | if (enable) { | |
109 | rc = of_property_read_u32(node, "qcom,rset-ohms", &rset); | |
110 | if (rc) { | |
111 | dev_err(chgr.dev, | |
112 | "can't find 'qcom,rset-ohms' in DT block"); | |
113 | return rc; | |
114 | } | |
115 | ||
116 | rc = of_property_read_u32(node, "qcom,vset-millivolts", &vset); | |
117 | if (rc) { | |
118 | dev_err(chgr.dev, | |
119 | "can't find 'qcom,vset-millivolts' in DT block"); | |
120 | return rc; | |
121 | } | |
122 | } | |
123 | ||
124 | return qcom_coincell_chgr_config(&chgr, rset, vset, enable); | |
125 | } | |
126 | ||
127 | static const struct of_device_id qcom_coincell_match_table[] = { | |
128 | { .compatible = "qcom,pm8941-coincell", }, | |
129 | {} | |
130 | }; | |
131 | ||
132 | MODULE_DEVICE_TABLE(of, qcom_coincell_match_table); | |
133 | ||
134 | static struct platform_driver qcom_coincell_driver = { | |
135 | .driver = { | |
136 | .name = "qcom-spmi-coincell", | |
137 | .of_match_table = qcom_coincell_match_table, | |
138 | }, | |
139 | .probe = qcom_coincell_probe, | |
140 | }; | |
141 | ||
142 | module_platform_driver(qcom_coincell_driver); | |
143 | ||
144 | MODULE_DESCRIPTION("Qualcomm PMIC coincell charger driver"); | |
145 | MODULE_LICENSE("GPL v2"); |