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1/*
2 * Backup battery driver for Wolfson Microelectronics wm831x PMICs
3 *
4 * Copyright 2009 Wolfson Microelectronics PLC.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11#include <linux/module.h>
12#include <linux/err.h>
13#include <linux/platform_device.h>
14#include <linux/power_supply.h>
15#include <linux/slab.h>
16
17#include <linux/mfd/wm831x/core.h>
18#include <linux/mfd/wm831x/auxadc.h>
19#include <linux/mfd/wm831x/pmu.h>
20#include <linux/mfd/wm831x/pdata.h>
21
22struct wm831x_backup {
23 struct wm831x *wm831x;
24 struct power_supply backup;
25 char name[20];
26};
27
28static int wm831x_backup_read_voltage(struct wm831x *wm831x,
29 enum wm831x_auxadc src,
30 union power_supply_propval *val)
31{
32 int ret;
33
34 ret = wm831x_auxadc_read_uv(wm831x, src);
35 if (ret >= 0)
36 val->intval = ret;
37
38 return ret;
39}
40
41/*********************************************************************
42 * Backup supply properties
43 *********************************************************************/
44
45static void wm831x_config_backup(struct wm831x *wm831x)
46{
47 struct wm831x_pdata *wm831x_pdata = wm831x->dev->platform_data;
48 struct wm831x_backup_pdata *pdata;
49 int ret, reg;
50
51 if (!wm831x_pdata || !wm831x_pdata->backup) {
52 dev_warn(wm831x->dev,
53 "No backup battery charger configuration\n");
54 return;
55 }
56
57 pdata = wm831x_pdata->backup;
58
59 reg = 0;
60
61 if (pdata->charger_enable)
62 reg |= WM831X_BKUP_CHG_ENA | WM831X_BKUP_BATT_DET_ENA;
63 if (pdata->no_constant_voltage)
64 reg |= WM831X_BKUP_CHG_MODE;
65
66 switch (pdata->vlim) {
67 case 2500:
68 break;
69 case 3100:
70 reg |= WM831X_BKUP_CHG_VLIM;
71 break;
72 default:
73 dev_err(wm831x->dev, "Invalid backup voltage limit %dmV\n",
74 pdata->vlim);
75 }
76
77 switch (pdata->ilim) {
78 case 100:
79 break;
80 case 200:
81 reg |= 1;
82 break;
83 case 300:
84 reg |= 2;
85 break;
86 case 400:
87 reg |= 3;
88 break;
89 default:
90 dev_err(wm831x->dev, "Invalid backup current limit %duA\n",
91 pdata->ilim);
92 }
93
94 ret = wm831x_reg_unlock(wm831x);
95 if (ret != 0) {
96 dev_err(wm831x->dev, "Failed to unlock registers: %d\n", ret);
97 return;
98 }
99
100 ret = wm831x_set_bits(wm831x, WM831X_BACKUP_CHARGER_CONTROL,
101 WM831X_BKUP_CHG_ENA_MASK |
102 WM831X_BKUP_CHG_MODE_MASK |
103 WM831X_BKUP_BATT_DET_ENA_MASK |
104 WM831X_BKUP_CHG_VLIM_MASK |
105 WM831X_BKUP_CHG_ILIM_MASK,
106 reg);
107 if (ret != 0)
108 dev_err(wm831x->dev,
109 "Failed to set backup charger config: %d\n", ret);
110
111 wm831x_reg_lock(wm831x);
112}
113
114static int wm831x_backup_get_prop(struct power_supply *psy,
115 enum power_supply_property psp,
116 union power_supply_propval *val)
117{
118 struct wm831x_backup *devdata = dev_get_drvdata(psy->dev->parent);
119 struct wm831x *wm831x = devdata->wm831x;
120 int ret = 0;
121
122 ret = wm831x_reg_read(wm831x, WM831X_BACKUP_CHARGER_CONTROL);
123 if (ret < 0)
124 return ret;
125
126 switch (psp) {
127 case POWER_SUPPLY_PROP_STATUS:
128 if (ret & WM831X_BKUP_CHG_STS)
129 val->intval = POWER_SUPPLY_STATUS_CHARGING;
130 else
131 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
132 break;
133
134 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
135 ret = wm831x_backup_read_voltage(wm831x, WM831X_AUX_BKUP_BATT,
136 val);
137 break;
138
139 case POWER_SUPPLY_PROP_PRESENT:
140 if (ret & WM831X_BKUP_CHG_STS)
141 val->intval = 1;
142 else
143 val->intval = 0;
144 break;
145
146 default:
147 ret = -EINVAL;
148 break;
149 }
150
151 return ret;
152}
153
154static enum power_supply_property wm831x_backup_props[] = {
155 POWER_SUPPLY_PROP_STATUS,
156 POWER_SUPPLY_PROP_VOLTAGE_NOW,
157 POWER_SUPPLY_PROP_PRESENT,
158};
159
160/*********************************************************************
161 * Initialisation
162 *********************************************************************/
163
164static int wm831x_backup_probe(struct platform_device *pdev)
165{
166 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
167 struct wm831x_pdata *wm831x_pdata = wm831x->dev->platform_data;
168 struct wm831x_backup *devdata;
169 struct power_supply *backup;
170 int ret;
171
172 devdata = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_backup),
173 GFP_KERNEL);
174 if (devdata == NULL)
175 return -ENOMEM;
176
177 devdata->wm831x = wm831x;
178 platform_set_drvdata(pdev, devdata);
179
180 backup = &devdata->backup;
181
182 /* We ignore configuration failures since we can still read
183 * back the status without enabling the charger (which may
184 * already be enabled anyway).
185 */
186 wm831x_config_backup(wm831x);
187
188 if (wm831x_pdata && wm831x_pdata->wm831x_num)
189 snprintf(devdata->name, sizeof(devdata->name),
190 "wm831x-backup.%d", wm831x_pdata->wm831x_num);
191 else
192 snprintf(devdata->name, sizeof(devdata->name),
193 "wm831x-backup");
194
195 backup->name = devdata->name;
196 backup->type = POWER_SUPPLY_TYPE_BATTERY;
197 backup->properties = wm831x_backup_props;
198 backup->num_properties = ARRAY_SIZE(wm831x_backup_props);
199 backup->get_property = wm831x_backup_get_prop;
200 ret = power_supply_register(&pdev->dev, backup);
201
202 return ret;
203}
204
205static int wm831x_backup_remove(struct platform_device *pdev)
206{
207 struct wm831x_backup *devdata = platform_get_drvdata(pdev);
208
209 power_supply_unregister(&devdata->backup);
210
211 return 0;
212}
213
214static struct platform_driver wm831x_backup_driver = {
215 .probe = wm831x_backup_probe,
216 .remove = wm831x_backup_remove,
217 .driver = {
218 .name = "wm831x-backup",
219 },
220};
221
222module_platform_driver(wm831x_backup_driver);
223
224MODULE_DESCRIPTION("Backup battery charger driver for WM831x PMICs");
225MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
226MODULE_LICENSE("GPL");
227MODULE_ALIAS("platform:wm831x-backup");
1/*
2 * Backup battery driver for Wolfson Microelectronics wm831x PMICs
3 *
4 * Copyright 2009 Wolfson Microelectronics PLC.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11#include <linux/module.h>
12#include <linux/err.h>
13#include <linux/platform_device.h>
14#include <linux/power_supply.h>
15#include <linux/slab.h>
16
17#include <linux/mfd/wm831x/core.h>
18#include <linux/mfd/wm831x/auxadc.h>
19#include <linux/mfd/wm831x/pmu.h>
20#include <linux/mfd/wm831x/pdata.h>
21
22struct wm831x_backup {
23 struct wm831x *wm831x;
24 struct power_supply *backup;
25 struct power_supply_desc backup_desc;
26 char name[20];
27};
28
29static int wm831x_backup_read_voltage(struct wm831x *wm831x,
30 enum wm831x_auxadc src,
31 union power_supply_propval *val)
32{
33 int ret;
34
35 ret = wm831x_auxadc_read_uv(wm831x, src);
36 if (ret >= 0)
37 val->intval = ret;
38
39 return ret;
40}
41
42/*********************************************************************
43 * Backup supply properties
44 *********************************************************************/
45
46static void wm831x_config_backup(struct wm831x *wm831x)
47{
48 struct wm831x_pdata *wm831x_pdata = wm831x->dev->platform_data;
49 struct wm831x_backup_pdata *pdata;
50 int ret, reg;
51
52 if (!wm831x_pdata || !wm831x_pdata->backup) {
53 dev_warn(wm831x->dev,
54 "No backup battery charger configuration\n");
55 return;
56 }
57
58 pdata = wm831x_pdata->backup;
59
60 reg = 0;
61
62 if (pdata->charger_enable)
63 reg |= WM831X_BKUP_CHG_ENA | WM831X_BKUP_BATT_DET_ENA;
64 if (pdata->no_constant_voltage)
65 reg |= WM831X_BKUP_CHG_MODE;
66
67 switch (pdata->vlim) {
68 case 2500:
69 break;
70 case 3100:
71 reg |= WM831X_BKUP_CHG_VLIM;
72 break;
73 default:
74 dev_err(wm831x->dev, "Invalid backup voltage limit %dmV\n",
75 pdata->vlim);
76 }
77
78 switch (pdata->ilim) {
79 case 100:
80 break;
81 case 200:
82 reg |= 1;
83 break;
84 case 300:
85 reg |= 2;
86 break;
87 case 400:
88 reg |= 3;
89 break;
90 default:
91 dev_err(wm831x->dev, "Invalid backup current limit %duA\n",
92 pdata->ilim);
93 }
94
95 ret = wm831x_reg_unlock(wm831x);
96 if (ret != 0) {
97 dev_err(wm831x->dev, "Failed to unlock registers: %d\n", ret);
98 return;
99 }
100
101 ret = wm831x_set_bits(wm831x, WM831X_BACKUP_CHARGER_CONTROL,
102 WM831X_BKUP_CHG_ENA_MASK |
103 WM831X_BKUP_CHG_MODE_MASK |
104 WM831X_BKUP_BATT_DET_ENA_MASK |
105 WM831X_BKUP_CHG_VLIM_MASK |
106 WM831X_BKUP_CHG_ILIM_MASK,
107 reg);
108 if (ret != 0)
109 dev_err(wm831x->dev,
110 "Failed to set backup charger config: %d\n", ret);
111
112 wm831x_reg_lock(wm831x);
113}
114
115static int wm831x_backup_get_prop(struct power_supply *psy,
116 enum power_supply_property psp,
117 union power_supply_propval *val)
118{
119 struct wm831x_backup *devdata = dev_get_drvdata(psy->dev.parent);
120 struct wm831x *wm831x = devdata->wm831x;
121 int ret = 0;
122
123 ret = wm831x_reg_read(wm831x, WM831X_BACKUP_CHARGER_CONTROL);
124 if (ret < 0)
125 return ret;
126
127 switch (psp) {
128 case POWER_SUPPLY_PROP_STATUS:
129 if (ret & WM831X_BKUP_CHG_STS)
130 val->intval = POWER_SUPPLY_STATUS_CHARGING;
131 else
132 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
133 break;
134
135 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
136 ret = wm831x_backup_read_voltage(wm831x, WM831X_AUX_BKUP_BATT,
137 val);
138 break;
139
140 case POWER_SUPPLY_PROP_PRESENT:
141 if (ret & WM831X_BKUP_CHG_STS)
142 val->intval = 1;
143 else
144 val->intval = 0;
145 break;
146
147 default:
148 ret = -EINVAL;
149 break;
150 }
151
152 return ret;
153}
154
155static enum power_supply_property wm831x_backup_props[] = {
156 POWER_SUPPLY_PROP_STATUS,
157 POWER_SUPPLY_PROP_VOLTAGE_NOW,
158 POWER_SUPPLY_PROP_PRESENT,
159};
160
161/*********************************************************************
162 * Initialisation
163 *********************************************************************/
164
165static int wm831x_backup_probe(struct platform_device *pdev)
166{
167 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
168 struct wm831x_pdata *wm831x_pdata = wm831x->dev->platform_data;
169 struct wm831x_backup *devdata;
170
171 devdata = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_backup),
172 GFP_KERNEL);
173 if (devdata == NULL)
174 return -ENOMEM;
175
176 devdata->wm831x = wm831x;
177 platform_set_drvdata(pdev, devdata);
178
179 /* We ignore configuration failures since we can still read
180 * back the status without enabling the charger (which may
181 * already be enabled anyway).
182 */
183 wm831x_config_backup(wm831x);
184
185 if (wm831x_pdata && wm831x_pdata->wm831x_num)
186 snprintf(devdata->name, sizeof(devdata->name),
187 "wm831x-backup.%d", wm831x_pdata->wm831x_num);
188 else
189 snprintf(devdata->name, sizeof(devdata->name),
190 "wm831x-backup");
191
192 devdata->backup_desc.name = devdata->name;
193 devdata->backup_desc.type = POWER_SUPPLY_TYPE_BATTERY;
194 devdata->backup_desc.properties = wm831x_backup_props;
195 devdata->backup_desc.num_properties = ARRAY_SIZE(wm831x_backup_props);
196 devdata->backup_desc.get_property = wm831x_backup_get_prop;
197 devdata->backup = power_supply_register(&pdev->dev,
198 &devdata->backup_desc, NULL);
199
200 return PTR_ERR_OR_ZERO(devdata->backup);
201}
202
203static int wm831x_backup_remove(struct platform_device *pdev)
204{
205 struct wm831x_backup *devdata = platform_get_drvdata(pdev);
206
207 power_supply_unregister(devdata->backup);
208
209 return 0;
210}
211
212static struct platform_driver wm831x_backup_driver = {
213 .probe = wm831x_backup_probe,
214 .remove = wm831x_backup_remove,
215 .driver = {
216 .name = "wm831x-backup",
217 },
218};
219
220module_platform_driver(wm831x_backup_driver);
221
222MODULE_DESCRIPTION("Backup battery charger driver for WM831x PMICs");
223MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
224MODULE_LICENSE("GPL");
225MODULE_ALIAS("platform:wm831x-backup");