2 * Battery charger driver for TI's tps65090
4 * Copyright (c) 2013, NVIDIA CORPORATION. All rights reserved.
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms and conditions of the GNU General Public License,
8 * version 2, as published by the Free Software Foundation.
10 * This program is distributed in the hope it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 #include <linux/err.h>
19 #include <linux/init.h>
20 #include <linux/interrupt.h>
21 #include <linux/kernel.h>
22 #include <linux/module.h>
23 #include <linux/slab.h>
24 #include <linux/delay.h>
25 #include <linux/platform_device.h>
26 #include <linux/power_supply.h>
27 #include <linux/mfd/tps65090.h>
29 #define TPS65090_REG_INTR_STS 0x00
30 #define TPS65090_REG_CG_CTRL0 0x04
31 #define TPS65090_REG_CG_CTRL1 0x05
32 #define TPS65090_REG_CG_CTRL2 0x06
33 #define TPS65090_REG_CG_CTRL3 0x07
34 #define TPS65090_REG_CG_CTRL4 0x08
35 #define TPS65090_REG_CG_CTRL5 0x09
36 #define TPS65090_REG_CG_STATUS1 0x0a
37 #define TPS65090_REG_CG_STATUS2 0x0b
39 #define TPS65090_CHARGER_ENABLE BIT(0)
40 #define TPS65090_VACG BIT(1)
41 #define TPS65090_NOITERM BIT(5)
43 struct tps65090_charger
{
48 struct power_supply ac
;
49 struct tps65090_platform_data
*pdata
;
52 static enum power_supply_property tps65090_ac_props
[] = {
53 POWER_SUPPLY_PROP_ONLINE
,
56 static int tps65090_low_chrg_current(struct tps65090_charger
*charger
)
60 ret
= tps65090_write(charger
->dev
->parent
, TPS65090_REG_CG_CTRL5
,
63 dev_err(charger
->dev
, "%s(): error reading in register 0x%x\n",
64 __func__
, TPS65090_REG_CG_CTRL5
);
70 static int tps65090_enable_charging(struct tps65090_charger
*charger
,
76 ret
= tps65090_read(charger
->dev
->parent
, TPS65090_REG_CG_CTRL0
,
79 dev_err(charger
->dev
, "%s(): error reading in register 0x%x\n",
80 __func__
, TPS65090_REG_CG_CTRL0
);
84 ret
= tps65090_write(charger
->dev
->parent
, TPS65090_REG_CG_CTRL0
,
85 (ctrl0
| TPS65090_CHARGER_ENABLE
));
87 dev_err(charger
->dev
, "%s(): error reading in register 0x%x\n",
88 __func__
, TPS65090_REG_CG_CTRL0
);
94 static int tps65090_config_charger(struct tps65090_charger
*charger
)
98 if (charger
->pdata
->enable_low_current_chrg
) {
99 ret
= tps65090_low_chrg_current(charger
);
101 dev_err(charger
->dev
,
102 "error configuring low charge current\n");
110 static int tps65090_ac_get_property(struct power_supply
*psy
,
111 enum power_supply_property psp
,
112 union power_supply_propval
*val
)
114 struct tps65090_charger
*charger
= container_of(psy
,
115 struct tps65090_charger
, ac
);
117 if (psp
== POWER_SUPPLY_PROP_ONLINE
) {
118 val
->intval
= charger
->ac_online
;
119 charger
->prev_ac_online
= charger
->ac_online
;
125 static irqreturn_t
tps65090_charger_isr(int irq
, void *dev_id
)
127 struct tps65090_charger
*charger
= dev_id
;
132 ret
= tps65090_read(charger
->dev
->parent
, TPS65090_REG_CG_STATUS1
,
135 dev_err(charger
->dev
, "%s(): Error in reading reg 0x%x\n",
136 __func__
, TPS65090_REG_CG_STATUS1
);
140 ret
= tps65090_read(charger
->dev
->parent
, TPS65090_REG_INTR_STS
,
143 dev_err(charger
->dev
, "%s(): Error in reading reg 0x%x\n",
144 __func__
, TPS65090_REG_INTR_STS
);
148 if (intrsts
& TPS65090_VACG
) {
149 ret
= tps65090_enable_charging(charger
, 1);
152 charger
->ac_online
= 1;
154 charger
->ac_online
= 0;
157 if (charger
->prev_ac_online
!= charger
->ac_online
)
158 power_supply_changed(&charger
->ac
);
163 #if defined(CONFIG_OF)
165 #include <linux/of_device.h>
167 static struct tps65090_platform_data
*
168 tps65090_parse_dt_charger_data(struct platform_device
*pdev
)
170 struct tps65090_platform_data
*pdata
;
171 struct device_node
*np
= pdev
->dev
.parent
->of_node
;
174 pdata
= devm_kzalloc(&pdev
->dev
, sizeof(*pdata
), GFP_KERNEL
);
176 dev_err(&pdev
->dev
, "Memory alloc for tps65090_pdata failed\n");
180 prop
= of_property_read_bool(np
, "ti,enable-low-current-chrg");
181 pdata
->enable_low_current_chrg
= prop
;
183 pdata
->irq_base
= -1;
189 static struct tps65090_platform_data
*
190 tps65090_parse_dt_charger_data(struct platform_device
*pdev
)
196 static int tps65090_charger_probe(struct platform_device
*pdev
)
198 struct tps65090
*tps65090_mfd
= dev_get_drvdata(pdev
->dev
.parent
);
199 struct tps65090_charger
*cdata
;
200 struct tps65090_platform_data
*pdata
;
205 pdata
= dev_get_platdata(pdev
->dev
.parent
);
207 if (!pdata
&& tps65090_mfd
->dev
->of_node
)
208 pdata
= tps65090_parse_dt_charger_data(pdev
);
211 dev_err(&pdev
->dev
, "%s():no platform data available\n",
216 cdata
= devm_kzalloc(&pdev
->dev
, sizeof(*cdata
), GFP_KERNEL
);
218 dev_err(&pdev
->dev
, "failed to allocate memory status\n");
222 dev_set_drvdata(&pdev
->dev
, cdata
);
224 cdata
->dev
= &pdev
->dev
;
225 cdata
->pdata
= pdata
;
227 cdata
->ac
.name
= "tps65090-ac";
228 cdata
->ac
.type
= POWER_SUPPLY_TYPE_MAINS
;
229 cdata
->ac
.get_property
= tps65090_ac_get_property
;
230 cdata
->ac
.properties
= tps65090_ac_props
;
231 cdata
->ac
.num_properties
= ARRAY_SIZE(tps65090_ac_props
);
232 cdata
->ac
.supplied_to
= pdata
->supplied_to
;
233 cdata
->ac
.num_supplicants
= pdata
->num_supplicants
;
235 ret
= power_supply_register(&pdev
->dev
, &cdata
->ac
);
237 dev_err(&pdev
->dev
, "failed: power supply register\n");
241 irq
= platform_get_irq(pdev
, 0);
243 dev_warn(&pdev
->dev
, "Unable to get charger irq = %d\n", irq
);
245 goto fail_unregister_supply
;
250 ret
= devm_request_threaded_irq(&pdev
->dev
, irq
, NULL
,
251 tps65090_charger_isr
, 0, "tps65090-charger", cdata
);
253 dev_err(cdata
->dev
, "Unable to register irq %d err %d\n", irq
,
258 ret
= tps65090_config_charger(cdata
);
260 dev_err(&pdev
->dev
, "charger config failed, err %d\n", ret
);
264 /* Check for charger presence */
265 ret
= tps65090_read(cdata
->dev
->parent
, TPS65090_REG_CG_STATUS1
,
268 dev_err(cdata
->dev
, "%s(): Error in reading reg 0x%x", __func__
,
269 TPS65090_REG_CG_STATUS1
);
274 ret
= tps65090_enable_charging(cdata
, 1);
276 dev_err(cdata
->dev
, "error enabling charger\n");
279 cdata
->ac_online
= 1;
280 power_supply_changed(&cdata
->ac
);
286 devm_free_irq(cdata
->dev
, irq
, cdata
);
287 fail_unregister_supply
:
288 power_supply_unregister(&cdata
->ac
);
293 static int tps65090_charger_remove(struct platform_device
*pdev
)
295 struct tps65090_charger
*cdata
= dev_get_drvdata(&pdev
->dev
);
297 devm_free_irq(cdata
->dev
, cdata
->irq
, cdata
);
298 power_supply_unregister(&cdata
->ac
);
303 static struct platform_driver tps65090_charger_driver
= {
305 .name
= "tps65090-charger",
306 .owner
= THIS_MODULE
,
308 .probe
= tps65090_charger_probe
,
309 .remove
= tps65090_charger_remove
,
311 module_platform_driver(tps65090_charger_driver
);
313 MODULE_LICENSE("GPL v2");
314 MODULE_AUTHOR("Syed Rafiuddin <srafiuddin@nvidia.com>");
315 MODULE_DESCRIPTION("tps65090 battery charger driver");