1// SPDX-License-Identifier: GPL-2.0+
2
3#include <linux/bitops.h>
4#include <linux/delay.h>
5#include <linux/gpio/consumer.h>
6#include <linux/i2c.h>
7#include <linux/kernel.h>
8#include <linux/module.h>
9#include <linux/mutex.h>
10#include <linux/regmap.h>
11#include <linux/regulator/driver.h>
12
13enum {
14	RTQ6752_IDX_PAVDD = 0,
15	RTQ6752_IDX_NAVDD = 1,
16	RTQ6752_IDX_MAX
17};
18
19#define RTQ6752_REG_PAVDD	0x00
20#define RTQ6752_REG_NAVDD	0x01
21#define RTQ6752_REG_PAVDDONDLY	0x07
22#define RTQ6752_REG_PAVDDSSTIME	0x08
23#define RTQ6752_REG_NAVDDONDLY	0x0D
24#define RTQ6752_REG_NAVDDSSTIME	0x0E
25#define RTQ6752_REG_OPTION1	0x12
26#define RTQ6752_REG_CHSWITCH	0x16
27#define RTQ6752_REG_FAULT	0x1D
28
29#define RTQ6752_VOUT_MASK	GENMASK(5, 0)
30#define RTQ6752_NAVDDEN_MASK	BIT(3)
31#define RTQ6752_PAVDDEN_MASK	BIT(0)
32#define RTQ6752_PAVDDAD_MASK	BIT(4)
33#define RTQ6752_NAVDDAD_MASK	BIT(3)
34#define RTQ6752_PAVDDF_MASK	BIT(3)
35#define RTQ6752_NAVDDF_MASK	BIT(0)
36#define RTQ6752_ENABLE_MASK	(BIT(RTQ6752_IDX_MAX) - 1)
37
38#define RTQ6752_VOUT_MINUV	5000000
39#define RTQ6752_VOUT_STEPUV	50000
40#define RTQ6752_VOUT_NUM	47
41#define RTQ6752_I2CRDY_TIMEUS	1000
42#define RTQ6752_MINSS_TIMEUS	5000
43
44struct rtq6752_priv {
45	struct regmap *regmap;
46	struct gpio_desc *enable_gpio;
47	struct mutex lock;
48	unsigned char enable_flag;
49};
50
51static int rtq6752_set_vdd_enable(struct regulator_dev *rdev)
52{
53	struct rtq6752_priv *priv = rdev_get_drvdata(rdev);
54	int rid = rdev_get_id(rdev), ret;
55
56	mutex_lock(&priv->lock);
57	if (!priv->enable_flag) {
58		if (priv->enable_gpio) {
59			gpiod_set_value(priv->enable_gpio, 1);
60
61			usleep_range(RTQ6752_I2CRDY_TIMEUS,
62				     RTQ6752_I2CRDY_TIMEUS + 100);
63		}
64
65		regcache_cache_only(priv->regmap, false);
66		ret = regcache_sync(priv->regmap);
67		if (ret) {
68			mutex_unlock(&priv->lock);
69			return ret;
70		}
71	}
72
73	priv->enable_flag |= BIT(rid);
74	mutex_unlock(&priv->lock);
75
76	return regulator_enable_regmap(rdev);
77}
78
79static int rtq6752_set_vdd_disable(struct regulator_dev *rdev)
80{
81	struct rtq6752_priv *priv = rdev_get_drvdata(rdev);
82	int rid = rdev_get_id(rdev), ret;
83
84	ret = regulator_disable_regmap(rdev);
85	if (ret)
86		return ret;
87
88	mutex_lock(&priv->lock);
89	priv->enable_flag &= ~BIT(rid);
90
91	if (!priv->enable_flag) {
92		regcache_cache_only(priv->regmap, true);
93		regcache_mark_dirty(priv->regmap);
94
95		if (priv->enable_gpio)
96			gpiod_set_value(priv->enable_gpio, 0);
97
98	}
99	mutex_unlock(&priv->lock);
100
101	return 0;
102}
103
104static int rtq6752_get_error_flags(struct regulator_dev *rdev,
105				   unsigned int *flags)
106{
107	unsigned int val, events = 0;
108	const unsigned int fault_mask[] = {
109		RTQ6752_PAVDDF_MASK, RTQ6752_NAVDDF_MASK };
110	int rid = rdev_get_id(rdev), ret;
111
112	ret = regmap_read(rdev->regmap, RTQ6752_REG_FAULT, &val);
113	if (ret)
114		return ret;
115
116	if (val & fault_mask[rid])
117		events = REGULATOR_ERROR_REGULATION_OUT;
118
119	*flags = events;
120	return 0;
121}
122
123static const struct regulator_ops rtq6752_regulator_ops = {
124	.list_voltage = regulator_list_voltage_linear,
125	.set_voltage_sel = regulator_set_voltage_sel_regmap,
126	.get_voltage_sel = regulator_get_voltage_sel_regmap,
127	.enable = rtq6752_set_vdd_enable,
128	.disable = rtq6752_set_vdd_disable,
129	.is_enabled = regulator_is_enabled_regmap,
130	.set_active_discharge = regulator_set_active_discharge_regmap,
131	.get_error_flags = rtq6752_get_error_flags,
132};
133
134static const struct regulator_desc rtq6752_regulator_descs[] = {
135	{
136		.name = "rtq6752-pavdd",
137		.of_match = of_match_ptr("pavdd"),
138		.regulators_node = of_match_ptr("regulators"),
139		.id = RTQ6752_IDX_PAVDD,
140		.n_voltages = RTQ6752_VOUT_NUM,
141		.ops = &rtq6752_regulator_ops,
142		.owner = THIS_MODULE,
143		.min_uV = RTQ6752_VOUT_MINUV,
144		.uV_step = RTQ6752_VOUT_STEPUV,
145		.enable_time = RTQ6752_MINSS_TIMEUS,
146		.vsel_reg = RTQ6752_REG_PAVDD,
147		.vsel_mask = RTQ6752_VOUT_MASK,
148		.enable_reg = RTQ6752_REG_CHSWITCH,
149		.enable_mask = RTQ6752_PAVDDEN_MASK,
150		.active_discharge_reg = RTQ6752_REG_OPTION1,
151		.active_discharge_mask = RTQ6752_PAVDDAD_MASK,
152		.active_discharge_off = RTQ6752_PAVDDAD_MASK,
153	},
154	{
155		.name = "rtq6752-navdd",
156		.of_match = of_match_ptr("navdd"),
157		.regulators_node = of_match_ptr("regulators"),
158		.id = RTQ6752_IDX_NAVDD,
159		.n_voltages = RTQ6752_VOUT_NUM,
160		.ops = &rtq6752_regulator_ops,
161		.owner = THIS_MODULE,
162		.min_uV = RTQ6752_VOUT_MINUV,
163		.uV_step = RTQ6752_VOUT_STEPUV,
164		.enable_time = RTQ6752_MINSS_TIMEUS,
165		.vsel_reg = RTQ6752_REG_NAVDD,
166		.vsel_mask = RTQ6752_VOUT_MASK,
167		.enable_reg = RTQ6752_REG_CHSWITCH,
168		.enable_mask = RTQ6752_NAVDDEN_MASK,
169		.active_discharge_reg = RTQ6752_REG_OPTION1,
170		.active_discharge_mask = RTQ6752_NAVDDAD_MASK,
171		.active_discharge_off = RTQ6752_NAVDDAD_MASK,
172	}
173};
174
175static int rtq6752_init_device_properties(struct rtq6752_priv *priv)
176{
177	u8 raw_vals[] = { 0, 0 };
178	int ret;
179
180	/* Configure PAVDD on and softstart delay time to the minimum */
181	ret = regmap_raw_write(priv->regmap, RTQ6752_REG_PAVDDONDLY, raw_vals,
182			       ARRAY_SIZE(raw_vals));
183	if (ret)
184		return ret;
185
186	/* Configure NAVDD on and softstart delay time to the minimum */
187	return regmap_raw_write(priv->regmap, RTQ6752_REG_NAVDDONDLY, raw_vals,
188				ARRAY_SIZE(raw_vals));
189}
190
191static bool rtq6752_is_volatile_reg(struct device *dev, unsigned int reg)
192{
193	if (reg == RTQ6752_REG_FAULT)
194		return true;
195	return false;
196}
197
198static const struct reg_default rtq6752_reg_defaults[] = {
199	{ RTQ6752_REG_PAVDD, 0x14 },
200	{ RTQ6752_REG_NAVDD, 0x14 },
201	{ RTQ6752_REG_PAVDDONDLY, 0x01 },
202	{ RTQ6752_REG_PAVDDSSTIME, 0x01 },
203	{ RTQ6752_REG_NAVDDONDLY, 0x01 },
204	{ RTQ6752_REG_NAVDDSSTIME, 0x01 },
205	{ RTQ6752_REG_OPTION1, 0x07 },
206	{ RTQ6752_REG_CHSWITCH, 0x29 },
207};
208
209static const struct regmap_config rtq6752_regmap_config = {
210	.reg_bits = 8,
211	.val_bits = 8,
212	.cache_type = REGCACHE_RBTREE,
213	.max_register = RTQ6752_REG_FAULT,
214	.reg_defaults = rtq6752_reg_defaults,
215	.num_reg_defaults = ARRAY_SIZE(rtq6752_reg_defaults),
216	.volatile_reg = rtq6752_is_volatile_reg,
217};
218
219static int rtq6752_probe(struct i2c_client *i2c)
220{
221	struct rtq6752_priv *priv;
222	struct regulator_config reg_cfg = {};
223	struct regulator_dev *rdev;
224	int i, ret;
225
226	priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL);
227	if (!priv)
228		return -ENOMEM;
229
230	mutex_init(&priv->lock);
231
232	priv->enable_gpio = devm_gpiod_get_optional(&i2c->dev, "enable",
233						    GPIOD_OUT_HIGH);
234	if (IS_ERR(priv->enable_gpio)) {
235		dev_err(&i2c->dev, "Failed to get 'enable' gpio\n");
236		return PTR_ERR(priv->enable_gpio);
237	}
238
239	usleep_range(RTQ6752_I2CRDY_TIMEUS, RTQ6752_I2CRDY_TIMEUS + 100);
240	/* Default EN pin to high, PAVDD and NAVDD will be on */
241	priv->enable_flag = RTQ6752_ENABLE_MASK;
242
243	priv->regmap = devm_regmap_init_i2c(i2c, &rtq6752_regmap_config);
244	if (IS_ERR(priv->regmap)) {
245		dev_err(&i2c->dev, "Failed to init regmap\n");
246		return PTR_ERR(priv->regmap);
247	}
248
249	ret = rtq6752_init_device_properties(priv);
250	if (ret) {
251		dev_err(&i2c->dev, "Failed to init device properties\n");
252		return ret;
253	}
254
255	reg_cfg.dev = &i2c->dev;
256	reg_cfg.regmap = priv->regmap;
257	reg_cfg.driver_data = priv;
258
259	for (i = 0; i < ARRAY_SIZE(rtq6752_regulator_descs); i++) {
260		rdev = devm_regulator_register(&i2c->dev,
261					       rtq6752_regulator_descs + i,
262					       &reg_cfg);
263		if (IS_ERR(rdev)) {
264			dev_err(&i2c->dev, "Failed to init %d regulator\n", i);
265			return PTR_ERR(rdev);
266		}
267	}
268
269	return 0;
270}
271
272static const struct of_device_id __maybe_unused rtq6752_device_table[] = {
273	{ .compatible = "richtek,rtq6752", },
274	{}
275};
276MODULE_DEVICE_TABLE(of, rtq6752_device_table);
277
278static struct i2c_driver rtq6752_driver = {
279	.driver = {
280		.name = "rtq6752",
281		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
282		.of_match_table = rtq6752_device_table,
283	},
284	.probe = rtq6752_probe,
285};
286module_i2c_driver(rtq6752_driver);
287
288MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
289MODULE_DESCRIPTION("Richtek RTQ6752 Regulator Driver");
290MODULE_LICENSE("GPL v2");
291