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Linux/drivers/regulator/tps65090-regulator.c

  1 /*
  2  * Regulator driver for tps65090 power management chip.
  3  *
  4  * Copyright (c) 2012, 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 
 19 #include <linux/module.h>
 20 #include <linux/init.h>
 21 #include <linux/gpio.h>
 22 #include <linux/of_gpio.h>
 23 #include <linux/slab.h>
 24 #include <linux/err.h>
 25 #include <linux/platform_device.h>
 26 #include <linux/regulator/driver.h>
 27 #include <linux/regulator/machine.h>
 28 #include <linux/regulator/of_regulator.h>
 29 #include <linux/mfd/tps65090.h>
 30 
 31 struct tps65090_regulator {
 32         struct device           *dev;
 33         struct regulator_desc   *desc;
 34         struct regulator_dev    *rdev;
 35 };
 36 
 37 static struct regulator_ops tps65090_ext_control_ops = {
 38 };
 39 
 40 static struct regulator_ops tps65090_reg_contol_ops = {
 41         .enable         = regulator_enable_regmap,
 42         .disable        = regulator_disable_regmap,
 43         .is_enabled     = regulator_is_enabled_regmap,
 44 };
 45 
 46 static struct regulator_ops tps65090_ldo_ops = {
 47 };
 48 
 49 #define tps65090_REG_DESC(_id, _sname, _en_reg, _ops)   \
 50 {                                                       \
 51         .name = "TPS65090_RAILS"#_id,                   \
 52         .supply_name = _sname,                          \
 53         .id = TPS65090_REGULATOR_##_id,                 \
 54         .ops = &_ops,                                   \
 55         .enable_reg = _en_reg,                          \
 56         .enable_mask = BIT(0),                          \
 57         .type = REGULATOR_VOLTAGE,                      \
 58         .owner = THIS_MODULE,                           \
 59 }
 60 
 61 static struct regulator_desc tps65090_regulator_desc[] = {
 62         tps65090_REG_DESC(DCDC1, "vsys1",   0x0C, tps65090_reg_contol_ops),
 63         tps65090_REG_DESC(DCDC2, "vsys2",   0x0D, tps65090_reg_contol_ops),
 64         tps65090_REG_DESC(DCDC3, "vsys3",   0x0E, tps65090_reg_contol_ops),
 65         tps65090_REG_DESC(FET1,  "infet1",  0x0F, tps65090_reg_contol_ops),
 66         tps65090_REG_DESC(FET2,  "infet2",  0x10, tps65090_reg_contol_ops),
 67         tps65090_REG_DESC(FET3,  "infet3",  0x11, tps65090_reg_contol_ops),
 68         tps65090_REG_DESC(FET4,  "infet4",  0x12, tps65090_reg_contol_ops),
 69         tps65090_REG_DESC(FET5,  "infet5",  0x13, tps65090_reg_contol_ops),
 70         tps65090_REG_DESC(FET6,  "infet6",  0x14, tps65090_reg_contol_ops),
 71         tps65090_REG_DESC(FET7,  "infet7",  0x15, tps65090_reg_contol_ops),
 72         tps65090_REG_DESC(LDO1,  "vsys-l1", 0,    tps65090_ldo_ops),
 73         tps65090_REG_DESC(LDO2,  "vsys-l2", 0,    tps65090_ldo_ops),
 74 };
 75 
 76 static inline bool is_dcdc(int id)
 77 {
 78         switch (id) {
 79         case TPS65090_REGULATOR_DCDC1:
 80         case TPS65090_REGULATOR_DCDC2:
 81         case TPS65090_REGULATOR_DCDC3:
 82                 return true;
 83         default:
 84                 return false;
 85         }
 86 }
 87 
 88 static int tps65090_config_ext_control(
 89         struct tps65090_regulator *ri, bool enable)
 90 {
 91         int ret;
 92         struct device *parent = ri->dev->parent;
 93         unsigned int reg_en_reg = ri->desc->enable_reg;
 94 
 95         if (enable)
 96                 ret = tps65090_set_bits(parent, reg_en_reg, 1);
 97         else
 98                 ret =  tps65090_clr_bits(parent, reg_en_reg, 1);
 99         if (ret < 0)
100                 dev_err(ri->dev, "Error in updating reg 0x%x\n", reg_en_reg);
101         return ret;
102 }
103 
104 static int tps65090_regulator_disable_ext_control(
105                 struct tps65090_regulator *ri,
106                 struct tps65090_regulator_plat_data *tps_pdata)
107 {
108         int ret = 0;
109         struct device *parent = ri->dev->parent;
110         unsigned int reg_en_reg = ri->desc->enable_reg;
111 
112         /*
113          * First enable output for internal control if require.
114          * And then disable external control.
115          */
116         if (tps_pdata->reg_init_data->constraints.always_on ||
117                         tps_pdata->reg_init_data->constraints.boot_on) {
118                 ret =  tps65090_set_bits(parent, reg_en_reg, 0);
119                 if (ret < 0) {
120                         dev_err(ri->dev, "Error in set reg 0x%x\n", reg_en_reg);
121                         return ret;
122                 }
123         }
124         return tps65090_config_ext_control(ri, false);
125 }
126 
127 static void tps65090_configure_regulator_config(
128                 struct tps65090_regulator_plat_data *tps_pdata,
129                 struct regulator_config *config)
130 {
131         if (gpio_is_valid(tps_pdata->gpio)) {
132                 int gpio_flag = GPIOF_OUT_INIT_LOW;
133 
134                 if (tps_pdata->reg_init_data->constraints.always_on ||
135                                 tps_pdata->reg_init_data->constraints.boot_on)
136                         gpio_flag = GPIOF_OUT_INIT_HIGH;
137 
138                 config->ena_gpio = tps_pdata->gpio;
139                 config->ena_gpio_flags = gpio_flag;
140         }
141 }
142 
143 #ifdef CONFIG_OF
144 static struct of_regulator_match tps65090_matches[] = {
145         { .name = "dcdc1", },
146         { .name = "dcdc2", },
147         { .name = "dcdc3", },
148         { .name = "fet1",  },
149         { .name = "fet2",  },
150         { .name = "fet3",  },
151         { .name = "fet4",  },
152         { .name = "fet5",  },
153         { .name = "fet6",  },
154         { .name = "fet7",  },
155         { .name = "ldo1",  },
156         { .name = "ldo2",  },
157 };
158 
159 static struct tps65090_platform_data *tps65090_parse_dt_reg_data(
160                 struct platform_device *pdev,
161                 struct of_regulator_match **tps65090_reg_matches)
162 {
163         struct tps65090_platform_data *tps65090_pdata;
164         struct device_node *np = pdev->dev.parent->of_node;
165         struct device_node *regulators;
166         int idx = 0, ret;
167         struct tps65090_regulator_plat_data *reg_pdata;
168 
169         tps65090_pdata = devm_kzalloc(&pdev->dev, sizeof(*tps65090_pdata),
170                                 GFP_KERNEL);
171         if (!tps65090_pdata)
172                 return ERR_PTR(-ENOMEM);
173 
174         reg_pdata = devm_kzalloc(&pdev->dev, TPS65090_REGULATOR_MAX *
175                                 sizeof(*reg_pdata), GFP_KERNEL);
176         if (!reg_pdata)
177                 return ERR_PTR(-ENOMEM);
178 
179         regulators = of_get_child_by_name(np, "regulators");
180         if (!regulators) {
181                 dev_err(&pdev->dev, "regulator node not found\n");
182                 return ERR_PTR(-ENODEV);
183         }
184 
185         ret = of_regulator_match(&pdev->dev, regulators, tps65090_matches,
186                         ARRAY_SIZE(tps65090_matches));
187         of_node_put(regulators);
188         if (ret < 0) {
189                 dev_err(&pdev->dev,
190                         "Error parsing regulator init data: %d\n", ret);
191                 return ERR_PTR(ret);
192         }
193 
194         *tps65090_reg_matches = tps65090_matches;
195         for (idx = 0; idx < ARRAY_SIZE(tps65090_matches); idx++) {
196                 struct regulator_init_data *ri_data;
197                 struct tps65090_regulator_plat_data *rpdata;
198 
199                 rpdata = &reg_pdata[idx];
200                 ri_data = tps65090_matches[idx].init_data;
201                 if (!ri_data || !tps65090_matches[idx].of_node)
202                         continue;
203 
204                 rpdata->reg_init_data = ri_data;
205                 rpdata->enable_ext_control = of_property_read_bool(
206                                         tps65090_matches[idx].of_node,
207                                         "ti,enable-ext-control");
208                 if (rpdata->enable_ext_control)
209                         rpdata->gpio = of_get_named_gpio(np,
210                                         "dcdc-ext-control-gpios", 0);
211 
212                 tps65090_pdata->reg_pdata[idx] = rpdata;
213         }
214         return tps65090_pdata;
215 }
216 #else
217 static inline struct tps65090_platform_data *tps65090_parse_dt_reg_data(
218                         struct platform_device *pdev,
219                         struct of_regulator_match **tps65090_reg_matches)
220 {
221         *tps65090_reg_matches = NULL;
222         return NULL;
223 }
224 #endif
225 
226 static int tps65090_regulator_probe(struct platform_device *pdev)
227 {
228         struct tps65090 *tps65090_mfd = dev_get_drvdata(pdev->dev.parent);
229         struct tps65090_regulator *ri = NULL;
230         struct regulator_config config = { };
231         struct regulator_dev *rdev;
232         struct tps65090_regulator_plat_data *tps_pdata;
233         struct tps65090_regulator *pmic;
234         struct tps65090_platform_data *tps65090_pdata;
235         struct of_regulator_match *tps65090_reg_matches = NULL;
236         int num;
237         int ret;
238 
239         dev_dbg(&pdev->dev, "Probing regulator\n");
240 
241         tps65090_pdata = dev_get_platdata(pdev->dev.parent);
242         if (!tps65090_pdata && tps65090_mfd->dev->of_node)
243                 tps65090_pdata = tps65090_parse_dt_reg_data(pdev,
244                                         &tps65090_reg_matches);
245         if (IS_ERR_OR_NULL(tps65090_pdata)) {
246                 dev_err(&pdev->dev, "Platform data missing\n");
247                 return tps65090_pdata ? PTR_ERR(tps65090_pdata) : -EINVAL;
248         }
249 
250         pmic = devm_kzalloc(&pdev->dev, TPS65090_REGULATOR_MAX * sizeof(*pmic),
251                         GFP_KERNEL);
252         if (!pmic)
253                 return -ENOMEM;
254 
255         for (num = 0; num < TPS65090_REGULATOR_MAX; num++) {
256                 tps_pdata = tps65090_pdata->reg_pdata[num];
257 
258                 ri = &pmic[num];
259                 ri->dev = &pdev->dev;
260                 ri->desc = &tps65090_regulator_desc[num];
261 
262                 /*
263                  * TPS5090 DCDC support the control from external digital input.
264                  * Configure it as per platform data.
265                  */
266                 if (tps_pdata && is_dcdc(num) && tps_pdata->reg_init_data) {
267                         if (tps_pdata->enable_ext_control) {
268                                 tps65090_configure_regulator_config(
269                                                 tps_pdata, &config);
270                                 ri->desc->ops = &tps65090_ext_control_ops;
271                         } else {
272                                 ret = tps65090_regulator_disable_ext_control(
273                                                 ri, tps_pdata);
274                                 if (ret < 0) {
275                                         dev_err(&pdev->dev,
276                                                 "failed disable ext control\n");
277                                         return ret;
278                                 }
279                         }
280                 }
281 
282                 config.dev = pdev->dev.parent;
283                 config.driver_data = ri;
284                 config.regmap = tps65090_mfd->rmap;
285                 if (tps_pdata)
286                         config.init_data = tps_pdata->reg_init_data;
287                 else
288                         config.init_data = NULL;
289                 if (tps65090_reg_matches)
290                         config.of_node = tps65090_reg_matches[num].of_node;
291                 else
292                         config.of_node = NULL;
293 
294                 rdev = devm_regulator_register(&pdev->dev, ri->desc, &config);
295                 if (IS_ERR(rdev)) {
296                         dev_err(&pdev->dev, "failed to register regulator %s\n",
297                                 ri->desc->name);
298                         return PTR_ERR(rdev);
299                 }
300                 ri->rdev = rdev;
301 
302                 /* Enable external control if it is require */
303                 if (tps_pdata && is_dcdc(num) && tps_pdata->reg_init_data &&
304                                 tps_pdata->enable_ext_control) {
305                         ret = tps65090_config_ext_control(ri, true);
306                         if (ret < 0)
307                                 return ret;
308                 }
309         }
310 
311         platform_set_drvdata(pdev, pmic);
312         return 0;
313 }
314 
315 static struct platform_driver tps65090_regulator_driver = {
316         .driver = {
317                 .name   = "tps65090-pmic",
318                 .owner  = THIS_MODULE,
319         },
320         .probe          = tps65090_regulator_probe,
321 };
322 
323 static int __init tps65090_regulator_init(void)
324 {
325         return platform_driver_register(&tps65090_regulator_driver);
326 }
327 subsys_initcall(tps65090_regulator_init);
328 
329 static void __exit tps65090_regulator_exit(void)
330 {
331         platform_driver_unregister(&tps65090_regulator_driver);
332 }
333 module_exit(tps65090_regulator_exit);
334 
335 MODULE_DESCRIPTION("tps65090 regulator driver");
336 MODULE_AUTHOR("Venu Byravarasu <vbyravarasu@nvidia.com>");
337 MODULE_LICENSE("GPL v2");
338 MODULE_ALIAS("platform:tps65090-pmic");
339 

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