1 /*
2 * Battery charger driver for TI's tps65090
3 *
4 * Copyright (c) 2013, NVIDIA CORPORATION. All rights reserved.
5
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.
9
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
13 * more details.
14
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/>.
17 */
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>
28
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
38
39 #define TPS65090_CHARGER_ENABLE BIT(0)
40 #define TPS65090_VACG BIT(1)
41 #define TPS65090_NOITERM BIT(5)
42
43 struct tps65090_charger {
44 struct device *dev;
45 int ac_online;
46 int prev_ac_online;
47 int irq;
48 struct power_supply ac;
49 struct tps65090_platform_data *pdata;
50 };
51
52 static enum power_supply_property tps65090_ac_props[] = {
53 POWER_SUPPLY_PROP_ONLINE,
54 };
55
tps65090_low_chrg_current(struct tps65090_charger * charger)56 static int tps65090_low_chrg_current(struct tps65090_charger *charger)
57 {
58 int ret;
59
60 ret = tps65090_write(charger->dev->parent, TPS65090_REG_CG_CTRL5,
61 TPS65090_NOITERM);
62 if (ret < 0) {
63 dev_err(charger->dev, "%s(): error reading in register 0x%x\n",
64 __func__, TPS65090_REG_CG_CTRL5);
65 return ret;
66 }
67 return 0;
68 }
69
tps65090_enable_charging(struct tps65090_charger * charger,uint8_t enable)70 static int tps65090_enable_charging(struct tps65090_charger *charger,
71 uint8_t enable)
72 {
73 int ret;
74 uint8_t ctrl0 = 0;
75
76 ret = tps65090_read(charger->dev->parent, TPS65090_REG_CG_CTRL0,
77 &ctrl0);
78 if (ret < 0) {
79 dev_err(charger->dev, "%s(): error reading in register 0x%x\n",
80 __func__, TPS65090_REG_CG_CTRL0);
81 return ret;
82 }
83
84 ret = tps65090_write(charger->dev->parent, TPS65090_REG_CG_CTRL0,
85 (ctrl0 | TPS65090_CHARGER_ENABLE));
86 if (ret < 0) {
87 dev_err(charger->dev, "%s(): error reading in register 0x%x\n",
88 __func__, TPS65090_REG_CG_CTRL0);
89 return ret;
90 }
91 return 0;
92 }
93
tps65090_config_charger(struct tps65090_charger * charger)94 static int tps65090_config_charger(struct tps65090_charger *charger)
95 {
96 int ret;
97
98 if (charger->pdata->enable_low_current_chrg) {
99 ret = tps65090_low_chrg_current(charger);
100 if (ret < 0) {
101 dev_err(charger->dev,
102 "error configuring low charge current\n");
103 return ret;
104 }
105 }
106
107 return 0;
108 }
109
tps65090_ac_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)110 static int tps65090_ac_get_property(struct power_supply *psy,
111 enum power_supply_property psp,
112 union power_supply_propval *val)
113 {
114 struct tps65090_charger *charger = container_of(psy,
115 struct tps65090_charger, ac);
116
117 if (psp == POWER_SUPPLY_PROP_ONLINE) {
118 val->intval = charger->ac_online;
119 charger->prev_ac_online = charger->ac_online;
120 return 0;
121 }
122 return -EINVAL;
123 }
124
tps65090_charger_isr(int irq,void * dev_id)125 static irqreturn_t tps65090_charger_isr(int irq, void *dev_id)
126 {
127 struct tps65090_charger *charger = dev_id;
128 int ret;
129 uint8_t status1 = 0;
130 uint8_t intrsts = 0;
131
132 ret = tps65090_read(charger->dev->parent, TPS65090_REG_CG_STATUS1,
133 &status1);
134 if (ret < 0) {
135 dev_err(charger->dev, "%s(): Error in reading reg 0x%x\n",
136 __func__, TPS65090_REG_CG_STATUS1);
137 return IRQ_HANDLED;
138 }
139 msleep(75);
140 ret = tps65090_read(charger->dev->parent, TPS65090_REG_INTR_STS,
141 &intrsts);
142 if (ret < 0) {
143 dev_err(charger->dev, "%s(): Error in reading reg 0x%x\n",
144 __func__, TPS65090_REG_INTR_STS);
145 return IRQ_HANDLED;
146 }
147
148 if (intrsts & TPS65090_VACG) {
149 ret = tps65090_enable_charging(charger, 1);
150 if (ret < 0)
151 return IRQ_HANDLED;
152 charger->ac_online = 1;
153 } else {
154 charger->ac_online = 0;
155 }
156
157 if (charger->prev_ac_online != charger->ac_online)
158 power_supply_changed(&charger->ac);
159
160 return IRQ_HANDLED;
161 }
162
163 #if defined(CONFIG_OF)
164
165 #include <linux/of_device.h>
166
167 static struct tps65090_platform_data *
tps65090_parse_dt_charger_data(struct platform_device * pdev)168 tps65090_parse_dt_charger_data(struct platform_device *pdev)
169 {
170 struct tps65090_platform_data *pdata;
171 struct device_node *np = pdev->dev.of_node;
172 unsigned int prop;
173
174 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
175 if (!pdata) {
176 dev_err(&pdev->dev, "Memory alloc for tps65090_pdata failed\n");
177 return NULL;
178 }
179
180 prop = of_property_read_bool(np, "ti,enable-low-current-chrg");
181 pdata->enable_low_current_chrg = prop;
182
183 pdata->irq_base = -1;
184
185 return pdata;
186
187 }
188 #else
189 static struct tps65090_platform_data *
tps65090_parse_dt_charger_data(struct platform_device * pdev)190 tps65090_parse_dt_charger_data(struct platform_device *pdev)
191 {
192 return NULL;
193 }
194 #endif
195
tps65090_charger_probe(struct platform_device * pdev)196 static int tps65090_charger_probe(struct platform_device *pdev)
197 {
198 struct tps65090_charger *cdata;
199 struct tps65090_platform_data *pdata;
200 uint8_t status1 = 0;
201 int ret;
202 int irq;
203
204 pdata = dev_get_platdata(pdev->dev.parent);
205
206 if (!pdata && pdev->dev.of_node)
207 pdata = tps65090_parse_dt_charger_data(pdev);
208
209 if (!pdata) {
210 dev_err(&pdev->dev, "%s():no platform data available\n",
211 __func__);
212 return -ENODEV;
213 }
214
215 cdata = devm_kzalloc(&pdev->dev, sizeof(*cdata), GFP_KERNEL);
216 if (!cdata) {
217 dev_err(&pdev->dev, "failed to allocate memory status\n");
218 return -ENOMEM;
219 }
220
221 dev_set_drvdata(&pdev->dev, cdata);
222
223 cdata->dev = &pdev->dev;
224 cdata->pdata = pdata;
225
226 cdata->ac.name = "tps65090-ac";
227 cdata->ac.type = POWER_SUPPLY_TYPE_MAINS;
228 cdata->ac.get_property = tps65090_ac_get_property;
229 cdata->ac.properties = tps65090_ac_props;
230 cdata->ac.num_properties = ARRAY_SIZE(tps65090_ac_props);
231 cdata->ac.supplied_to = pdata->supplied_to;
232 cdata->ac.num_supplicants = pdata->num_supplicants;
233
234 ret = power_supply_register(&pdev->dev, &cdata->ac);
235 if (ret) {
236 dev_err(&pdev->dev, "failed: power supply register\n");
237 return ret;
238 }
239
240 irq = platform_get_irq(pdev, 0);
241 if (irq <= 0) {
242 dev_warn(&pdev->dev, "Unable to get charger irq = %d\n", irq);
243 ret = irq;
244 goto fail_unregister_supply;
245 }
246
247 cdata->irq = irq;
248
249 ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
250 tps65090_charger_isr, 0, "tps65090-charger", cdata);
251 if (ret) {
252 dev_err(cdata->dev, "Unable to register irq %d err %d\n", irq,
253 ret);
254 goto fail_free_irq;
255 }
256
257 ret = tps65090_config_charger(cdata);
258 if (ret < 0) {
259 dev_err(&pdev->dev, "charger config failed, err %d\n", ret);
260 goto fail_free_irq;
261 }
262
263 /* Check for charger presence */
264 ret = tps65090_read(cdata->dev->parent, TPS65090_REG_CG_STATUS1,
265 &status1);
266 if (ret < 0) {
267 dev_err(cdata->dev, "%s(): Error in reading reg 0x%x", __func__,
268 TPS65090_REG_CG_STATUS1);
269 goto fail_free_irq;
270 }
271
272 if (status1 != 0) {
273 ret = tps65090_enable_charging(cdata, 1);
274 if (ret < 0) {
275 dev_err(cdata->dev, "error enabling charger\n");
276 goto fail_free_irq;
277 }
278 cdata->ac_online = 1;
279 power_supply_changed(&cdata->ac);
280 }
281
282 return 0;
283
284 fail_free_irq:
285 devm_free_irq(cdata->dev, irq, cdata);
286 fail_unregister_supply:
287 power_supply_unregister(&cdata->ac);
288
289 return ret;
290 }
291
tps65090_charger_remove(struct platform_device * pdev)292 static int tps65090_charger_remove(struct platform_device *pdev)
293 {
294 struct tps65090_charger *cdata = dev_get_drvdata(&pdev->dev);
295
296 devm_free_irq(cdata->dev, cdata->irq, cdata);
297 power_supply_unregister(&cdata->ac);
298
299 return 0;
300 }
301
302 static struct of_device_id of_tps65090_charger_match[] = {
303 { .compatible = "ti,tps65090-charger", },
304 { /* end */ }
305 };
306
307 static struct platform_driver tps65090_charger_driver = {
308 .driver = {
309 .name = "tps65090-charger",
310 .of_match_table = of_tps65090_charger_match,
311 .owner = THIS_MODULE,
312 },
313 .probe = tps65090_charger_probe,
314 .remove = tps65090_charger_remove,
315 };
316 module_platform_driver(tps65090_charger_driver);
317
318 MODULE_LICENSE("GPL v2");
319 MODULE_AUTHOR("Syed Rafiuddin <srafiuddin@nvidia.com>");
320 MODULE_DESCRIPTION("tps65090 battery charger driver");
321