1// SPDX-License-Identifier: GPL-2.0
2#include <linux/export.h>
3#include <linux/power_supply.h>
4#include <linux/of.h>
5
6#include "ab8500-bm.h"
7
8/* Default: under this temperature, charging is stopped */
9#define AB8500_TEMP_UNDER 3
10/* Default: between this temp and AB8500_TEMP_UNDER charging is reduced */
11#define AB8500_TEMP_LOW 8
12/* Default: between this temp and AB8500_TEMP_OVER charging is reduced */
13#define AB8500_TEMP_HIGH 43
14/* Default: over this temp, charging is stopped */
15#define AB8500_TEMP_OVER 48
16/* Default: temperature hysteresis */
17#define AB8500_TEMP_HYSTERESIS 3
18
19static const struct power_supply_battery_ocv_table ocv_cap_tbl[] = {
20 { .ocv = 4186000, .capacity = 100},
21 { .ocv = 4163000, .capacity = 99},
22 { .ocv = 4114000, .capacity = 95},
23 { .ocv = 4068000, .capacity = 90},
24 { .ocv = 3990000, .capacity = 80},
25 { .ocv = 3926000, .capacity = 70},
26 { .ocv = 3898000, .capacity = 65},
27 { .ocv = 3866000, .capacity = 60},
28 { .ocv = 3833000, .capacity = 55},
29 { .ocv = 3812000, .capacity = 50},
30 { .ocv = 3787000, .capacity = 40},
31 { .ocv = 3768000, .capacity = 30},
32 { .ocv = 3747000, .capacity = 25},
33 { .ocv = 3730000, .capacity = 20},
34 { .ocv = 3705000, .capacity = 15},
35 { .ocv = 3699000, .capacity = 14},
36 { .ocv = 3684000, .capacity = 12},
37 { .ocv = 3672000, .capacity = 9},
38 { .ocv = 3657000, .capacity = 7},
39 { .ocv = 3638000, .capacity = 6},
40 { .ocv = 3556000, .capacity = 4},
41 { .ocv = 3424000, .capacity = 2},
42 { .ocv = 3317000, .capacity = 1},
43 { .ocv = 3094000, .capacity = 0},
44};
45
46/*
47 * Note that the batres_vs_temp table must be strictly sorted by falling
48 * temperature values to work. Factory resistance is 300 mOhm and the
49 * resistance values to the right are percentages of 300 mOhm.
50 */
51static const struct power_supply_resistance_temp_table temp_to_batres_tbl_thermistor[] = {
52 { .temp = 40, .resistance = 40 /* 120 mOhm */ },
53 { .temp = 30, .resistance = 45 /* 135 mOhm */ },
54 { .temp = 20, .resistance = 55 /* 165 mOhm */ },
55 { .temp = 10, .resistance = 77 /* 230 mOhm */ },
56 { .temp = 00, .resistance = 108 /* 325 mOhm */ },
57 { .temp = -10, .resistance = 158 /* 445 mOhm */ },
58 { .temp = -20, .resistance = 198 /* 595 mOhm */ },
59};
60
61static struct power_supply_maintenance_charge_table ab8500_maint_charg_table[] = {
62 {
63 /* Maintenance charging phase A, 60 hours */
64 .charge_current_max_ua = 400000,
65 .charge_voltage_max_uv = 4050000,
66 .charge_safety_timer_minutes = 60*60,
67 },
68 {
69 /* Maintenance charging phase B, 200 hours */
70 .charge_current_max_ua = 400000,
71 .charge_voltage_max_uv = 4000000,
72 .charge_safety_timer_minutes = 200*60,
73 }
74};
75
76static const struct ab8500_bm_capacity_levels cap_levels = {
77 .critical = 2,
78 .low = 10,
79 .normal = 70,
80 .high = 95,
81 .full = 100,
82};
83
84static const struct ab8500_fg_parameters fg = {
85 .recovery_sleep_timer = 10,
86 .recovery_total_time = 100,
87 .init_timer = 1,
88 .init_discard_time = 5,
89 .init_total_time = 40,
90 .high_curr_time = 60,
91 .accu_charging = 30,
92 .accu_high_curr = 30,
93 .high_curr_threshold_ua = 50000,
94 .lowbat_threshold_uv = 3100000,
95 .battok_falling_th_sel0 = 2860,
96 .battok_raising_th_sel1 = 2860,
97 .maint_thres = 95,
98 .user_cap_limit = 15,
99 .pcut_enable = 1,
100 .pcut_max_time = 127,
101 .pcut_flag_time = 112,
102 .pcut_max_restart = 15,
103 .pcut_debounce_time = 2,
104};
105
106static const struct ab8500_maxim_parameters ab8500_maxi_params = {
107 .ena_maxi = true,
108 .chg_curr_ua = 910000,
109 .wait_cycles = 10,
110 .charger_curr_step_ua = 100000,
111};
112
113static const struct ab8500_bm_charger_parameters chg = {
114 .usb_volt_max_uv = 5500000,
115 .usb_curr_max_ua = 1500000,
116 .ac_volt_max_uv = 7500000,
117 .ac_curr_max_ua = 1500000,
118};
119
120/* This is referenced directly in the charger code */
121struct ab8500_bm_data ab8500_bm_data = {
122 .main_safety_tmr_h = 4,
123 .temp_interval_chg = 20,
124 .temp_interval_nochg = 120,
125 .usb_safety_tmr_h = 4,
126 .bkup_bat_v = BUP_VCH_SEL_2P6V,
127 .bkup_bat_i = BUP_ICH_SEL_150UA,
128 .capacity_scaling = false,
129 .chg_unknown_bat = false,
130 .enable_overshoot = false,
131 .fg_res = 100,
132 .cap_levels = &cap_levels,
133 .interval_charging = 5,
134 .interval_not_charging = 120,
135 .maxi = &ab8500_maxi_params,
136 .chg_params = &chg,
137 .fg_params = &fg,
138};
139
140int ab8500_bm_of_probe(struct power_supply *psy,
141 struct ab8500_bm_data *bm)
142{
143 struct power_supply_battery_info *bi;
144 struct device *dev = &psy->dev;
145 int ret;
146
147 ret = power_supply_get_battery_info(psy, info_out: &bm->bi);
148 if (ret) {
149 dev_err(dev, "cannot retrieve battery info\n");
150 return ret;
151 }
152 bi = bm->bi;
153
154 /* Fill in defaults for any data missing from the device tree */
155 if (bi->charge_full_design_uah < 0)
156 /* The default capacity is 612 mAh for unknown batteries */
157 bi->charge_full_design_uah = 612000;
158
159 /*
160 * All of these voltages need to be specified or we will simply
161 * fall back to safe defaults.
162 */
163 if ((bi->voltage_min_design_uv < 0) ||
164 (bi->voltage_max_design_uv < 0)) {
165 /* Nominal voltage is 3.7V for unknown batteries */
166 bi->voltage_min_design_uv = 3700000;
167 /* Termination voltage 4.05V */
168 bi->voltage_max_design_uv = 4050000;
169 }
170
171 if (bi->constant_charge_current_max_ua < 0)
172 bi->constant_charge_current_max_ua = 400000;
173
174 if (bi->constant_charge_voltage_max_uv < 0)
175 bi->constant_charge_voltage_max_uv = 4100000;
176
177 if (bi->charge_term_current_ua)
178 /* Charging stops when we drop below this current */
179 bi->charge_term_current_ua = 200000;
180
181 if (!bi->maintenance_charge || !bi->maintenance_charge_size) {
182 bi->maintenance_charge = ab8500_maint_charg_table;
183 bi->maintenance_charge_size = ARRAY_SIZE(ab8500_maint_charg_table);
184 }
185
186 if (bi->alert_low_temp_charge_current_ua < 0 ||
187 bi->alert_low_temp_charge_voltage_uv < 0)
188 {
189 bi->alert_low_temp_charge_current_ua = 300000;
190 bi->alert_low_temp_charge_voltage_uv = 4000000;
191 }
192 if (bi->alert_high_temp_charge_current_ua < 0 ||
193 bi->alert_high_temp_charge_voltage_uv < 0)
194 {
195 bi->alert_high_temp_charge_current_ua = 300000;
196 bi->alert_high_temp_charge_voltage_uv = 4000000;
197 }
198
199 /*
200 * Internal resistance and factory resistance are tightly coupled
201 * so both MUST be defined or we fall back to defaults.
202 */
203 if ((bi->factory_internal_resistance_uohm < 0) ||
204 !bi->resist_table) {
205 bi->factory_internal_resistance_uohm = 300000;
206 bi->resist_table = temp_to_batres_tbl_thermistor;
207 bi->resist_table_size = ARRAY_SIZE(temp_to_batres_tbl_thermistor);
208 }
209
210 /* The default battery is emulated by a resistor at 7K */
211 if (bi->bti_resistance_ohm < 0 ||
212 bi->bti_resistance_tolerance < 0) {
213 bi->bti_resistance_ohm = 7000;
214 bi->bti_resistance_tolerance = 20;
215 }
216
217 if (!bi->ocv_table[0]) {
218 /* Default capacity table at say 25 degrees Celsius */
219 bi->ocv_temp[0] = 25;
220 bi->ocv_table[0] = ocv_cap_tbl;
221 bi->ocv_table_size[0] = ARRAY_SIZE(ocv_cap_tbl);
222 }
223
224 if (bi->temp_min == INT_MIN)
225 bi->temp_min = AB8500_TEMP_UNDER;
226 if (bi->temp_max == INT_MAX)
227 bi->temp_max = AB8500_TEMP_OVER;
228 if (bi->temp_alert_min == INT_MIN)
229 bi->temp_alert_min = AB8500_TEMP_LOW;
230 if (bi->temp_alert_max == INT_MAX)
231 bi->temp_alert_max = AB8500_TEMP_HIGH;
232 bm->temp_hysteresis = AB8500_TEMP_HYSTERESIS;
233
234 return 0;
235}
236
237void ab8500_bm_of_remove(struct power_supply *psy,
238 struct ab8500_bm_data *bm)
239{
240 power_supply_put_battery_info(psy, info: bm->bi);
241}
242

source code of linux/drivers/power/supply/ab8500_bmdata.c