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
 31struct tps65090_regulator {
 32	struct device		*dev;
 33	struct regulator_desc	*desc;
 34	struct regulator_dev	*rdev;
 35};
 36
 37static struct regulator_ops tps65090_ext_control_ops = {
 38};
 39
 40static 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
 46static 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
 61static 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
 76static 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
 88static 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
104static 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
127static 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
144static 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
159static 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
217static 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
226static 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
315static struct platform_driver tps65090_regulator_driver = {
316	.driver	= {
317		.name	= "tps65090-pmic",
318		.owner	= THIS_MODULE,
319	},
320	.probe		= tps65090_regulator_probe,
321};
322
323static int __init tps65090_regulator_init(void)
324{
325	return platform_driver_register(&tps65090_regulator_driver);
326}
327subsys_initcall(tps65090_regulator_init);
328
329static void __exit tps65090_regulator_exit(void)
330{
331	platform_driver_unregister(&tps65090_regulator_driver);
332}
333module_exit(tps65090_regulator_exit);
334
335MODULE_DESCRIPTION("tps65090 regulator driver");
336MODULE_AUTHOR("Venu Byravarasu <vbyravarasu@nvidia.com>");
337MODULE_LICENSE("GPL v2");
338MODULE_ALIAS("platform:tps65090-pmic");