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 		dev_err(&pdev->dev, "Memory alloc for tps65090_pdata failed\n");
173 		return ERR_PTR(-ENOMEM);
174 	}
175 
176 	reg_pdata = devm_kzalloc(&pdev->dev, TPS65090_REGULATOR_MAX *
177 				sizeof(*reg_pdata), GFP_KERNEL);
178 	if (!reg_pdata) {
179 		dev_err(&pdev->dev, "Memory alloc for reg_pdata failed\n");
180 		return ERR_PTR(-ENOMEM);
181 	}
182 
183 	regulators = of_find_node_by_name(np, "regulators");
184 	if (!regulators) {
185 		dev_err(&pdev->dev, "regulator node not found\n");
186 		return ERR_PTR(-ENODEV);
187 	}
188 
189 	ret = of_regulator_match(&pdev->dev, regulators, tps65090_matches,
190 			ARRAY_SIZE(tps65090_matches));
191 	if (ret < 0) {
192 		dev_err(&pdev->dev,
193 			"Error parsing regulator init data: %d\n", ret);
194 		return ERR_PTR(ret);
195 	}
196 
197 	*tps65090_reg_matches = tps65090_matches;
198 	for (idx = 0; idx < ARRAY_SIZE(tps65090_matches); idx++) {
199 		struct regulator_init_data *ri_data;
200 		struct tps65090_regulator_plat_data *rpdata;
201 
202 		rpdata = &reg_pdata[idx];
203 		ri_data = tps65090_matches[idx].init_data;
204 		if (!ri_data || !tps65090_matches[idx].of_node)
205 			continue;
206 
207 		rpdata->reg_init_data = ri_data;
208 		rpdata->enable_ext_control = of_property_read_bool(
209 					tps65090_matches[idx].of_node,
210 					"ti,enable-ext-control");
211 		if (rpdata->enable_ext_control)
212 			rpdata->gpio = of_get_named_gpio(np,
213 					"dcdc-ext-control-gpios", 0);
214 
215 		tps65090_pdata->reg_pdata[idx] = rpdata;
216 	}
217 	return tps65090_pdata;
218 }
219 #else
220 static inline struct tps65090_platform_data *tps65090_parse_dt_reg_data(
221 			struct platform_device *pdev,
222 			struct of_regulator_match **tps65090_reg_matches)
223 {
224 	*tps65090_reg_matches = NULL;
225 	return NULL;
226 }
227 #endif
228 
229 static int tps65090_regulator_probe(struct platform_device *pdev)
230 {
231 	struct tps65090 *tps65090_mfd = dev_get_drvdata(pdev->dev.parent);
232 	struct tps65090_regulator *ri = NULL;
233 	struct regulator_config config = { };
234 	struct regulator_dev *rdev;
235 	struct tps65090_regulator_plat_data *tps_pdata;
236 	struct tps65090_regulator *pmic;
237 	struct tps65090_platform_data *tps65090_pdata;
238 	struct of_regulator_match *tps65090_reg_matches = NULL;
239 	int num;
240 	int ret;
241 
242 	dev_dbg(&pdev->dev, "Probing regulator\n");
243 
244 	tps65090_pdata = dev_get_platdata(pdev->dev.parent);
245 	if (!tps65090_pdata && tps65090_mfd->dev->of_node)
246 		tps65090_pdata = tps65090_parse_dt_reg_data(pdev,
247 					&tps65090_reg_matches);
248 	if (IS_ERR_OR_NULL(tps65090_pdata)) {
249 		dev_err(&pdev->dev, "Platform data missing\n");
250 		return tps65090_pdata ? PTR_ERR(tps65090_pdata) : -EINVAL;
251 	}
252 
253 	pmic = devm_kzalloc(&pdev->dev, TPS65090_REGULATOR_MAX * sizeof(*pmic),
254 			GFP_KERNEL);
255 	if (!pmic) {
256 		dev_err(&pdev->dev, "mem alloc for pmic failed\n");
257 		return -ENOMEM;
258 	}
259 
260 	for (num = 0; num < TPS65090_REGULATOR_MAX; num++) {
261 		tps_pdata = tps65090_pdata->reg_pdata[num];
262 
263 		ri = &pmic[num];
264 		ri->dev = &pdev->dev;
265 		ri->desc = &tps65090_regulator_desc[num];
266 
267 		/*
268 		 * TPS5090 DCDC support the control from external digital input.
269 		 * Configure it as per platform data.
270 		 */
271 		if (tps_pdata && is_dcdc(num) && tps_pdata->reg_init_data) {
272 			if (tps_pdata->enable_ext_control) {
273 				tps65090_configure_regulator_config(
274 						tps_pdata, &config);
275 				ri->desc->ops = &tps65090_ext_control_ops;
276 			} else {
277 				ret = tps65090_regulator_disable_ext_control(
278 						ri, tps_pdata);
279 				if (ret < 0) {
280 					dev_err(&pdev->dev,
281 						"failed disable ext control\n");
282 					goto scrub;
283 				}
284 			}
285 		}
286 
287 		config.dev = pdev->dev.parent;
288 		config.driver_data = ri;
289 		config.regmap = tps65090_mfd->rmap;
290 		if (tps_pdata)
291 			config.init_data = tps_pdata->reg_init_data;
292 		else
293 			config.init_data = NULL;
294 		if (tps65090_reg_matches)
295 			config.of_node = tps65090_reg_matches[num].of_node;
296 		else
297 			config.of_node = NULL;
298 
299 		rdev = regulator_register(ri->desc, &config);
300 		if (IS_ERR(rdev)) {
301 			dev_err(&pdev->dev, "failed to register regulator %s\n",
302 				ri->desc->name);
303 			ret = PTR_ERR(rdev);
304 			goto scrub;
305 		}
306 		ri->rdev = rdev;
307 
308 		/* Enable external control if it is require */
309 		if (tps_pdata && is_dcdc(num) && tps_pdata->reg_init_data &&
310 				tps_pdata->enable_ext_control) {
311 			ret = tps65090_config_ext_control(ri, true);
312 			if (ret < 0) {
313 				/* Increment num to get unregister rdev */
314 				num++;
315 				goto scrub;
316 			}
317 		}
318 	}
319 
320 	platform_set_drvdata(pdev, pmic);
321 	return 0;
322 
323 scrub:
324 	while (--num >= 0) {
325 		ri = &pmic[num];
326 		regulator_unregister(ri->rdev);
327 	}
328 	return ret;
329 }
330 
331 static int tps65090_regulator_remove(struct platform_device *pdev)
332 {
333 	struct tps65090_regulator *pmic = platform_get_drvdata(pdev);
334 	struct tps65090_regulator *ri;
335 	int num;
336 
337 	for (num = 0; num < TPS65090_REGULATOR_MAX; ++num) {
338 		ri = &pmic[num];
339 		regulator_unregister(ri->rdev);
340 	}
341 	return 0;
342 }
343 
344 static struct platform_driver tps65090_regulator_driver = {
345 	.driver	= {
346 		.name	= "tps65090-pmic",
347 		.owner	= THIS_MODULE,
348 	},
349 	.probe		= tps65090_regulator_probe,
350 	.remove		= tps65090_regulator_remove,
351 };
352 
353 static int __init tps65090_regulator_init(void)
354 {
355 	return platform_driver_register(&tps65090_regulator_driver);
356 }
357 subsys_initcall(tps65090_regulator_init);
358 
359 static void __exit tps65090_regulator_exit(void)
360 {
361 	platform_driver_unregister(&tps65090_regulator_driver);
362 }
363 module_exit(tps65090_regulator_exit);
364 
365 MODULE_DESCRIPTION("tps65090 regulator driver");
366 MODULE_AUTHOR("Venu Byravarasu <vbyravarasu@nvidia.com>");
367 MODULE_LICENSE("GPL v2");
368 MODULE_ALIAS("platform:tps65090-pmic");
369