ab8500_bmdata.c

  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, &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, bm->bi);
241}