This source file includes following definitions.
- psp_val_to_charge_mode
- charge_mode_to_psp_val
- wilco_charge_get_property
- wilco_charge_set_property
- wilco_charge_property_is_writeable
- wilco_charge_probe
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12 #include <linux/module.h>
13 #include <linux/platform_device.h>
14 #include <linux/platform_data/wilco-ec.h>
15 #include <linux/power_supply.h>
16
17 #define DRV_NAME "wilco-charger"
18
19
20 #define PID_CHARGE_MODE 0x0710
21 #define PID_CHARGE_LOWER_LIMIT 0x0711
22 #define PID_CHARGE_UPPER_LIMIT 0x0712
23
24 enum charge_mode {
25 CHARGE_MODE_STD = 1,
26 CHARGE_MODE_EXP = 2,
27 CHARGE_MODE_AC = 3,
28 CHARGE_MODE_AUTO = 4,
29 CHARGE_MODE_CUSTOM = 5,
30 };
31
32 #define CHARGE_LOWER_LIMIT_MIN 50
33 #define CHARGE_LOWER_LIMIT_MAX 95
34 #define CHARGE_UPPER_LIMIT_MIN 55
35 #define CHARGE_UPPER_LIMIT_MAX 100
36
37
38 static int psp_val_to_charge_mode(int psp_val)
39 {
40 switch (psp_val) {
41 case POWER_SUPPLY_CHARGE_TYPE_TRICKLE:
42 return CHARGE_MODE_AC;
43 case POWER_SUPPLY_CHARGE_TYPE_FAST:
44 return CHARGE_MODE_EXP;
45 case POWER_SUPPLY_CHARGE_TYPE_STANDARD:
46 return CHARGE_MODE_STD;
47 case POWER_SUPPLY_CHARGE_TYPE_ADAPTIVE:
48 return CHARGE_MODE_AUTO;
49 case POWER_SUPPLY_CHARGE_TYPE_CUSTOM:
50 return CHARGE_MODE_CUSTOM;
51 default:
52 return -EINVAL;
53 }
54 }
55
56
57 static int charge_mode_to_psp_val(enum charge_mode mode)
58 {
59 switch (mode) {
60 case CHARGE_MODE_AC:
61 return POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
62 case CHARGE_MODE_EXP:
63 return POWER_SUPPLY_CHARGE_TYPE_FAST;
64 case CHARGE_MODE_STD:
65 return POWER_SUPPLY_CHARGE_TYPE_STANDARD;
66 case CHARGE_MODE_AUTO:
67 return POWER_SUPPLY_CHARGE_TYPE_ADAPTIVE;
68 case CHARGE_MODE_CUSTOM:
69 return POWER_SUPPLY_CHARGE_TYPE_CUSTOM;
70 default:
71 return -EINVAL;
72 }
73 }
74
75 static enum power_supply_property wilco_charge_props[] = {
76 POWER_SUPPLY_PROP_CHARGE_TYPE,
77 POWER_SUPPLY_PROP_CHARGE_CONTROL_START_THRESHOLD,
78 POWER_SUPPLY_PROP_CHARGE_CONTROL_END_THRESHOLD,
79 };
80
81 static int wilco_charge_get_property(struct power_supply *psy,
82 enum power_supply_property psp,
83 union power_supply_propval *val)
84 {
85 struct wilco_ec_device *ec = power_supply_get_drvdata(psy);
86 u32 property_id;
87 int ret;
88 u8 raw;
89
90 switch (psp) {
91 case POWER_SUPPLY_PROP_CHARGE_TYPE:
92 property_id = PID_CHARGE_MODE;
93 break;
94 case POWER_SUPPLY_PROP_CHARGE_CONTROL_START_THRESHOLD:
95 property_id = PID_CHARGE_LOWER_LIMIT;
96 break;
97 case POWER_SUPPLY_PROP_CHARGE_CONTROL_END_THRESHOLD:
98 property_id = PID_CHARGE_UPPER_LIMIT;
99 break;
100 default:
101 return -EINVAL;
102 }
103
104 ret = wilco_ec_get_byte_property(ec, property_id, &raw);
105 if (ret < 0)
106 return ret;
107 if (property_id == PID_CHARGE_MODE) {
108 ret = charge_mode_to_psp_val(raw);
109 if (ret < 0)
110 return -EBADMSG;
111 raw = ret;
112 }
113 val->intval = raw;
114
115 return 0;
116 }
117
118 static int wilco_charge_set_property(struct power_supply *psy,
119 enum power_supply_property psp,
120 const union power_supply_propval *val)
121 {
122 struct wilco_ec_device *ec = power_supply_get_drvdata(psy);
123 int mode;
124
125 switch (psp) {
126 case POWER_SUPPLY_PROP_CHARGE_TYPE:
127 mode = psp_val_to_charge_mode(val->intval);
128 if (mode < 0)
129 return -EINVAL;
130 return wilco_ec_set_byte_property(ec, PID_CHARGE_MODE, mode);
131 case POWER_SUPPLY_PROP_CHARGE_CONTROL_START_THRESHOLD:
132 if (val->intval < CHARGE_LOWER_LIMIT_MIN ||
133 val->intval > CHARGE_LOWER_LIMIT_MAX)
134 return -EINVAL;
135 return wilco_ec_set_byte_property(ec, PID_CHARGE_LOWER_LIMIT,
136 val->intval);
137 case POWER_SUPPLY_PROP_CHARGE_CONTROL_END_THRESHOLD:
138 if (val->intval < CHARGE_UPPER_LIMIT_MIN ||
139 val->intval > CHARGE_UPPER_LIMIT_MAX)
140 return -EINVAL;
141 return wilco_ec_set_byte_property(ec, PID_CHARGE_UPPER_LIMIT,
142 val->intval);
143 default:
144 return -EINVAL;
145 }
146 }
147
148 static int wilco_charge_property_is_writeable(struct power_supply *psy,
149 enum power_supply_property psp)
150 {
151 return 1;
152 }
153
154 static const struct power_supply_desc wilco_ps_desc = {
155 .properties = wilco_charge_props,
156 .num_properties = ARRAY_SIZE(wilco_charge_props),
157 .get_property = wilco_charge_get_property,
158 .set_property = wilco_charge_set_property,
159 .property_is_writeable = wilco_charge_property_is_writeable,
160 .name = DRV_NAME,
161 .type = POWER_SUPPLY_TYPE_MAINS,
162 };
163
164 static int wilco_charge_probe(struct platform_device *pdev)
165 {
166 struct wilco_ec_device *ec = dev_get_drvdata(pdev->dev.parent);
167 struct power_supply_config psy_cfg = {};
168 struct power_supply *psy;
169
170 psy_cfg.drv_data = ec;
171 psy = devm_power_supply_register(&pdev->dev, &wilco_ps_desc, &psy_cfg);
172
173 return PTR_ERR_OR_ZERO(psy);
174 }
175
176 static struct platform_driver wilco_charge_driver = {
177 .probe = wilco_charge_probe,
178 .driver = {
179 .name = DRV_NAME,
180 }
181 };
182 module_platform_driver(wilco_charge_driver);
183
184 MODULE_ALIAS("platform:" DRV_NAME);
185 MODULE_AUTHOR("Nick Crews <ncrews@chromium.org>");
186 MODULE_LICENSE("GPL v2");
187 MODULE_DESCRIPTION("Wilco EC charge control driver");