1de20b747SChiYuan Huang // SPDX-License-Identifier: GPL-2.0-only
2de20b747SChiYuan Huang
3de20b747SChiYuan Huang #include <linux/delay.h>
4de20b747SChiYuan Huang #include <linux/gpio/consumer.h>
5de20b747SChiYuan Huang #include <linux/i2c.h>
6de20b747SChiYuan Huang #include <linux/kernel.h>
7de20b747SChiYuan Huang #include <linux/module.h>
8de20b747SChiYuan Huang #include <linux/property.h>
9de20b747SChiYuan Huang #include <linux/regmap.h>
10de20b747SChiYuan Huang #include <linux/regulator/driver.h>
11de20b747SChiYuan Huang #include <linux/regulator/of_regulator.h>
12de20b747SChiYuan Huang
13de20b747SChiYuan Huang #define RT6160_MODE_AUTO 0
14de20b747SChiYuan Huang #define RT6160_MODE_FPWM 1
15de20b747SChiYuan Huang
16de20b747SChiYuan Huang #define RT6160_REG_CNTL 0x01
17de20b747SChiYuan Huang #define RT6160_REG_STATUS 0x02
18de20b747SChiYuan Huang #define RT6160_REG_DEVID 0x03
19de20b747SChiYuan Huang #define RT6160_REG_VSELL 0x04
20de20b747SChiYuan Huang #define RT6160_REG_VSELH 0x05
21de20b747SChiYuan Huang #define RT6160_NUM_REGS (RT6160_REG_VSELH + 1)
22de20b747SChiYuan Huang
23de20b747SChiYuan Huang #define RT6160_FPWM_MASK BIT(3)
24de20b747SChiYuan Huang #define RT6160_RAMPRATE_MASK GENMASK(1, 0)
25de20b747SChiYuan Huang #define RT6160_VID_MASK GENMASK(7, 4)
26de20b747SChiYuan Huang #define RT6160_VSEL_MASK GENMASK(6, 0)
27de20b747SChiYuan Huang #define RT6160_HDSTAT_MASK BIT(4)
28de20b747SChiYuan Huang #define RT6160_UVSTAT_MASK BIT(3)
29de20b747SChiYuan Huang #define RT6160_OCSTAT_MASK BIT(2)
30de20b747SChiYuan Huang #define RT6160_TSDSTAT_MASK BIT(1)
31de20b747SChiYuan Huang #define RT6160_PGSTAT_MASK BIT(0)
32de20b747SChiYuan Huang
33de20b747SChiYuan Huang #define RT6160_VENDOR_ID 0xA0
34de20b747SChiYuan Huang #define RT6160_VOUT_MINUV 2025000
35de20b747SChiYuan Huang #define RT6160_VOUT_MAXUV 5200000
36de20b747SChiYuan Huang #define RT6160_VOUT_STPUV 25000
37de20b747SChiYuan Huang #define RT6160_N_VOUTS ((RT6160_VOUT_MAXUV - RT6160_VOUT_MINUV) / RT6160_VOUT_STPUV + 1)
38de20b747SChiYuan Huang
39de20b747SChiYuan Huang #define RT6160_I2CRDY_TIMEUS 100
40de20b747SChiYuan Huang
41de20b747SChiYuan Huang struct rt6160_priv {
42de20b747SChiYuan Huang struct regulator_desc desc;
43de20b747SChiYuan Huang struct gpio_desc *enable_gpio;
44de20b747SChiYuan Huang struct regmap *regmap;
45de20b747SChiYuan Huang bool enable_state;
46de20b747SChiYuan Huang };
47de20b747SChiYuan Huang
48b113ec2dSAxel Lin static const unsigned int rt6160_ramp_tables[] = {
49b113ec2dSAxel Lin 1000, 2500, 5000, 10000
50b113ec2dSAxel Lin };
51b113ec2dSAxel Lin
rt6160_enable(struct regulator_dev * rdev)52de20b747SChiYuan Huang static int rt6160_enable(struct regulator_dev *rdev)
53de20b747SChiYuan Huang {
54de20b747SChiYuan Huang struct rt6160_priv *priv = rdev_get_drvdata(rdev);
55de20b747SChiYuan Huang
56de20b747SChiYuan Huang if (!priv->enable_gpio)
57de20b747SChiYuan Huang return 0;
58de20b747SChiYuan Huang
59de20b747SChiYuan Huang gpiod_set_value_cansleep(priv->enable_gpio, 1);
60de20b747SChiYuan Huang priv->enable_state = true;
61de20b747SChiYuan Huang
62de20b747SChiYuan Huang usleep_range(RT6160_I2CRDY_TIMEUS, RT6160_I2CRDY_TIMEUS + 100);
63de20b747SChiYuan Huang
64de20b747SChiYuan Huang regcache_cache_only(priv->regmap, false);
65de20b747SChiYuan Huang return regcache_sync(priv->regmap);
66de20b747SChiYuan Huang }
67de20b747SChiYuan Huang
rt6160_disable(struct regulator_dev * rdev)68de20b747SChiYuan Huang static int rt6160_disable(struct regulator_dev *rdev)
69de20b747SChiYuan Huang {
70de20b747SChiYuan Huang struct rt6160_priv *priv = rdev_get_drvdata(rdev);
71de20b747SChiYuan Huang
72de20b747SChiYuan Huang if (!priv->enable_gpio)
73de20b747SChiYuan Huang return -EINVAL;
74de20b747SChiYuan Huang
75de20b747SChiYuan Huang /* Mark regcache as dirty and cache only before HW disabled */
76de20b747SChiYuan Huang regcache_cache_only(priv->regmap, true);
77de20b747SChiYuan Huang regcache_mark_dirty(priv->regmap);
78de20b747SChiYuan Huang
79de20b747SChiYuan Huang priv->enable_state = false;
80de20b747SChiYuan Huang gpiod_set_value_cansleep(priv->enable_gpio, 0);
81de20b747SChiYuan Huang
82de20b747SChiYuan Huang return 0;
83de20b747SChiYuan Huang }
84de20b747SChiYuan Huang
rt6160_is_enabled(struct regulator_dev * rdev)85de20b747SChiYuan Huang static int rt6160_is_enabled(struct regulator_dev *rdev)
86de20b747SChiYuan Huang {
87de20b747SChiYuan Huang struct rt6160_priv *priv = rdev_get_drvdata(rdev);
88de20b747SChiYuan Huang
89de20b747SChiYuan Huang return priv->enable_state ? 1 : 0;
90de20b747SChiYuan Huang }
91de20b747SChiYuan Huang
rt6160_set_mode(struct regulator_dev * rdev,unsigned int mode)92de20b747SChiYuan Huang static int rt6160_set_mode(struct regulator_dev *rdev, unsigned int mode)
93de20b747SChiYuan Huang {
94de20b747SChiYuan Huang struct regmap *regmap = rdev_get_regmap(rdev);
95de20b747SChiYuan Huang unsigned int mode_val;
96de20b747SChiYuan Huang
97de20b747SChiYuan Huang switch (mode) {
98de20b747SChiYuan Huang case REGULATOR_MODE_FAST:
99de20b747SChiYuan Huang mode_val = RT6160_FPWM_MASK;
100de20b747SChiYuan Huang break;
101de20b747SChiYuan Huang case REGULATOR_MODE_NORMAL:
102de20b747SChiYuan Huang mode_val = 0;
103de20b747SChiYuan Huang break;
104de20b747SChiYuan Huang default:
105de20b747SChiYuan Huang dev_err(&rdev->dev, "mode not supported\n");
106de20b747SChiYuan Huang return -EINVAL;
107de20b747SChiYuan Huang }
108de20b747SChiYuan Huang
109de20b747SChiYuan Huang return regmap_update_bits(regmap, RT6160_REG_CNTL, RT6160_FPWM_MASK, mode_val);
110de20b747SChiYuan Huang }
111de20b747SChiYuan Huang
rt6160_get_mode(struct regulator_dev * rdev)112de20b747SChiYuan Huang static unsigned int rt6160_get_mode(struct regulator_dev *rdev)
113de20b747SChiYuan Huang {
114de20b747SChiYuan Huang struct regmap *regmap = rdev_get_regmap(rdev);
115de20b747SChiYuan Huang unsigned int val;
116de20b747SChiYuan Huang int ret;
117de20b747SChiYuan Huang
118de20b747SChiYuan Huang ret = regmap_read(regmap, RT6160_REG_CNTL, &val);
119de20b747SChiYuan Huang if (ret)
120de20b747SChiYuan Huang return ret;
121de20b747SChiYuan Huang
122de20b747SChiYuan Huang if (val & RT6160_FPWM_MASK)
123de20b747SChiYuan Huang return REGULATOR_MODE_FAST;
124de20b747SChiYuan Huang
125de20b747SChiYuan Huang return REGULATOR_MODE_NORMAL;
126de20b747SChiYuan Huang }
127de20b747SChiYuan Huang
rt6160_set_suspend_voltage(struct regulator_dev * rdev,int uV)128de20b747SChiYuan Huang static int rt6160_set_suspend_voltage(struct regulator_dev *rdev, int uV)
129de20b747SChiYuan Huang {
130de20b747SChiYuan Huang struct regmap *regmap = rdev_get_regmap(rdev);
131512d8956SAxel Lin unsigned int suspend_vsel_reg;
132de20b747SChiYuan Huang int vsel;
133de20b747SChiYuan Huang
134de20b747SChiYuan Huang vsel = regulator_map_voltage_linear(rdev, uV, uV);
135de20b747SChiYuan Huang if (vsel < 0)
136de20b747SChiYuan Huang return vsel;
137de20b747SChiYuan Huang
138512d8956SAxel Lin if (rdev->desc->vsel_reg == RT6160_REG_VSELL)
139512d8956SAxel Lin suspend_vsel_reg = RT6160_REG_VSELH;
140512d8956SAxel Lin else
141512d8956SAxel Lin suspend_vsel_reg = RT6160_REG_VSELL;
142512d8956SAxel Lin
143512d8956SAxel Lin return regmap_update_bits(regmap, suspend_vsel_reg,
144f3f4f37dSAxel Lin RT6160_VSEL_MASK, vsel);
145de20b747SChiYuan Huang }
146de20b747SChiYuan Huang
rt6160_get_error_flags(struct regulator_dev * rdev,unsigned int * flags)147de20b747SChiYuan Huang static int rt6160_get_error_flags(struct regulator_dev *rdev, unsigned int *flags)
148de20b747SChiYuan Huang {
149de20b747SChiYuan Huang struct regmap *regmap = rdev_get_regmap(rdev);
150de20b747SChiYuan Huang unsigned int val, events = 0;
151de20b747SChiYuan Huang int ret;
152de20b747SChiYuan Huang
153de20b747SChiYuan Huang ret = regmap_read(regmap, RT6160_REG_STATUS, &val);
154de20b747SChiYuan Huang if (ret)
155de20b747SChiYuan Huang return ret;
156de20b747SChiYuan Huang
157de20b747SChiYuan Huang if (val & (RT6160_HDSTAT_MASK | RT6160_TSDSTAT_MASK))
158de20b747SChiYuan Huang events |= REGULATOR_ERROR_OVER_TEMP;
159de20b747SChiYuan Huang
160de20b747SChiYuan Huang if (val & RT6160_UVSTAT_MASK)
161de20b747SChiYuan Huang events |= REGULATOR_ERROR_UNDER_VOLTAGE;
162de20b747SChiYuan Huang
163de20b747SChiYuan Huang if (val & RT6160_OCSTAT_MASK)
164de20b747SChiYuan Huang events |= REGULATOR_ERROR_OVER_CURRENT;
165de20b747SChiYuan Huang
166de20b747SChiYuan Huang if (val & RT6160_PGSTAT_MASK)
167de20b747SChiYuan Huang events |= REGULATOR_ERROR_FAIL;
168de20b747SChiYuan Huang
169de20b747SChiYuan Huang *flags = events;
170de20b747SChiYuan Huang return 0;
171de20b747SChiYuan Huang }
172de20b747SChiYuan Huang
173de20b747SChiYuan Huang static const struct regulator_ops rt6160_regulator_ops = {
174de20b747SChiYuan Huang .list_voltage = regulator_list_voltage_linear,
175de20b747SChiYuan Huang .set_voltage_sel = regulator_set_voltage_sel_regmap,
176de20b747SChiYuan Huang .get_voltage_sel = regulator_get_voltage_sel_regmap,
177de20b747SChiYuan Huang
178de20b747SChiYuan Huang .enable = rt6160_enable,
179de20b747SChiYuan Huang .disable = rt6160_disable,
180de20b747SChiYuan Huang .is_enabled = rt6160_is_enabled,
181de20b747SChiYuan Huang
182de20b747SChiYuan Huang .set_mode = rt6160_set_mode,
183de20b747SChiYuan Huang .get_mode = rt6160_get_mode,
184de20b747SChiYuan Huang .set_suspend_voltage = rt6160_set_suspend_voltage,
185b113ec2dSAxel Lin .set_ramp_delay = regulator_set_ramp_delay_regmap,
186de20b747SChiYuan Huang .get_error_flags = rt6160_get_error_flags,
187de20b747SChiYuan Huang };
188de20b747SChiYuan Huang
rt6160_of_map_mode(unsigned int mode)189de20b747SChiYuan Huang static unsigned int rt6160_of_map_mode(unsigned int mode)
190de20b747SChiYuan Huang {
191de20b747SChiYuan Huang switch (mode) {
192de20b747SChiYuan Huang case RT6160_MODE_FPWM:
193de20b747SChiYuan Huang return REGULATOR_MODE_FAST;
194de20b747SChiYuan Huang case RT6160_MODE_AUTO:
195de20b747SChiYuan Huang return REGULATOR_MODE_NORMAL;
196de20b747SChiYuan Huang }
197de20b747SChiYuan Huang
198de20b747SChiYuan Huang return REGULATOR_MODE_INVALID;
199de20b747SChiYuan Huang }
200de20b747SChiYuan Huang
rt6160_is_accessible_reg(struct device * dev,unsigned int reg)201de20b747SChiYuan Huang static bool rt6160_is_accessible_reg(struct device *dev, unsigned int reg)
202de20b747SChiYuan Huang {
203de20b747SChiYuan Huang if (reg >= RT6160_REG_CNTL && reg <= RT6160_REG_VSELH)
204de20b747SChiYuan Huang return true;
205de20b747SChiYuan Huang return false;
206de20b747SChiYuan Huang }
207de20b747SChiYuan Huang
rt6160_is_volatile_reg(struct device * dev,unsigned int reg)208de20b747SChiYuan Huang static bool rt6160_is_volatile_reg(struct device *dev, unsigned int reg)
209de20b747SChiYuan Huang {
210de20b747SChiYuan Huang if (reg == RT6160_REG_STATUS)
211de20b747SChiYuan Huang return true;
212de20b747SChiYuan Huang return false;
213de20b747SChiYuan Huang }
214de20b747SChiYuan Huang
215de20b747SChiYuan Huang static const struct regmap_config rt6160_regmap_config = {
216de20b747SChiYuan Huang .reg_bits = 8,
217de20b747SChiYuan Huang .val_bits = 8,
218de20b747SChiYuan Huang .max_register = RT6160_REG_VSELH,
219de20b747SChiYuan Huang .num_reg_defaults_raw = RT6160_NUM_REGS,
220de20b747SChiYuan Huang .cache_type = REGCACHE_FLAT,
221de20b747SChiYuan Huang
222de20b747SChiYuan Huang .writeable_reg = rt6160_is_accessible_reg,
223de20b747SChiYuan Huang .readable_reg = rt6160_is_accessible_reg,
224de20b747SChiYuan Huang .volatile_reg = rt6160_is_volatile_reg,
225de20b747SChiYuan Huang };
226de20b747SChiYuan Huang
rt6160_probe(struct i2c_client * i2c)227de20b747SChiYuan Huang static int rt6160_probe(struct i2c_client *i2c)
228de20b747SChiYuan Huang {
229de20b747SChiYuan Huang struct rt6160_priv *priv;
230de20b747SChiYuan Huang struct regulator_config regulator_cfg = {};
231de20b747SChiYuan Huang struct regulator_dev *rdev;
232f3f4f37dSAxel Lin bool vsel_active_low;
233de20b747SChiYuan Huang unsigned int devid;
234de20b747SChiYuan Huang int ret;
235de20b747SChiYuan Huang
236de20b747SChiYuan Huang priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL);
237de20b747SChiYuan Huang if (!priv)
238de20b747SChiYuan Huang return -ENOMEM;
239de20b747SChiYuan Huang
240f3f4f37dSAxel Lin vsel_active_low =
241f3f4f37dSAxel Lin device_property_present(&i2c->dev, "richtek,vsel-active-low");
242de20b747SChiYuan Huang
243de20b747SChiYuan Huang priv->enable_gpio = devm_gpiod_get_optional(&i2c->dev, "enable", GPIOD_OUT_HIGH);
244de20b747SChiYuan Huang if (IS_ERR(priv->enable_gpio)) {
245de20b747SChiYuan Huang dev_err(&i2c->dev, "Failed to get 'enable' gpio\n");
246de20b747SChiYuan Huang return PTR_ERR(priv->enable_gpio);
247de20b747SChiYuan Huang }
248de20b747SChiYuan Huang priv->enable_state = true;
249de20b747SChiYuan Huang
250de20b747SChiYuan Huang usleep_range(RT6160_I2CRDY_TIMEUS, RT6160_I2CRDY_TIMEUS + 100);
251de20b747SChiYuan Huang
252de20b747SChiYuan Huang priv->regmap = devm_regmap_init_i2c(i2c, &rt6160_regmap_config);
253de20b747SChiYuan Huang if (IS_ERR(priv->regmap)) {
254de20b747SChiYuan Huang ret = PTR_ERR(priv->regmap);
255de20b747SChiYuan Huang dev_err(&i2c->dev, "Failed to init regmap (%d)\n", ret);
256de20b747SChiYuan Huang return ret;
257de20b747SChiYuan Huang }
258de20b747SChiYuan Huang
259de20b747SChiYuan Huang ret = regmap_read(priv->regmap, RT6160_REG_DEVID, &devid);
260de20b747SChiYuan Huang if (ret)
261de20b747SChiYuan Huang return ret;
262de20b747SChiYuan Huang
263de20b747SChiYuan Huang if ((devid & RT6160_VID_MASK) != RT6160_VENDOR_ID) {
264de20b747SChiYuan Huang dev_err(&i2c->dev, "VID not correct [0x%02x]\n", devid);
265de20b747SChiYuan Huang return -ENODEV;
266de20b747SChiYuan Huang }
267de20b747SChiYuan Huang
268de20b747SChiYuan Huang priv->desc.name = "rt6160-buckboost";
269de20b747SChiYuan Huang priv->desc.type = REGULATOR_VOLTAGE;
270de20b747SChiYuan Huang priv->desc.owner = THIS_MODULE;
271de20b747SChiYuan Huang priv->desc.min_uV = RT6160_VOUT_MINUV;
272de20b747SChiYuan Huang priv->desc.uV_step = RT6160_VOUT_STPUV;
273f3f4f37dSAxel Lin if (vsel_active_low)
274f3f4f37dSAxel Lin priv->desc.vsel_reg = RT6160_REG_VSELL;
275f3f4f37dSAxel Lin else
276de20b747SChiYuan Huang priv->desc.vsel_reg = RT6160_REG_VSELH;
277de20b747SChiYuan Huang priv->desc.vsel_mask = RT6160_VSEL_MASK;
278de20b747SChiYuan Huang priv->desc.n_voltages = RT6160_N_VOUTS;
279b113ec2dSAxel Lin priv->desc.ramp_reg = RT6160_REG_CNTL;
280b113ec2dSAxel Lin priv->desc.ramp_mask = RT6160_RAMPRATE_MASK;
281b113ec2dSAxel Lin priv->desc.ramp_delay_table = rt6160_ramp_tables;
282b113ec2dSAxel Lin priv->desc.n_ramp_values = ARRAY_SIZE(rt6160_ramp_tables);
283de20b747SChiYuan Huang priv->desc.of_map_mode = rt6160_of_map_mode;
284de20b747SChiYuan Huang priv->desc.ops = &rt6160_regulator_ops;
285de20b747SChiYuan Huang
286de20b747SChiYuan Huang regulator_cfg.dev = &i2c->dev;
287de20b747SChiYuan Huang regulator_cfg.of_node = i2c->dev.of_node;
288de20b747SChiYuan Huang regulator_cfg.regmap = priv->regmap;
289de20b747SChiYuan Huang regulator_cfg.driver_data = priv;
290de20b747SChiYuan Huang regulator_cfg.init_data = of_get_regulator_init_data(&i2c->dev, i2c->dev.of_node,
291de20b747SChiYuan Huang &priv->desc);
292de20b747SChiYuan Huang
293de20b747SChiYuan Huang rdev = devm_regulator_register(&i2c->dev, &priv->desc, ®ulator_cfg);
294de20b747SChiYuan Huang if (IS_ERR(rdev)) {
295de20b747SChiYuan Huang dev_err(&i2c->dev, "Failed to register regulator\n");
296de20b747SChiYuan Huang return PTR_ERR(rdev);
297de20b747SChiYuan Huang }
298de20b747SChiYuan Huang
299de20b747SChiYuan Huang return 0;
300de20b747SChiYuan Huang }
301de20b747SChiYuan Huang
302de20b747SChiYuan Huang static const struct of_device_id __maybe_unused rt6160_of_match_table[] = {
303de20b747SChiYuan Huang { .compatible = "richtek,rt6160", },
304de20b747SChiYuan Huang {}
305de20b747SChiYuan Huang };
306de20b747SChiYuan Huang MODULE_DEVICE_TABLE(of, rt6160_of_match_table);
307de20b747SChiYuan Huang
308de20b747SChiYuan Huang static struct i2c_driver rt6160_driver = {
309de20b747SChiYuan Huang .driver = {
310de20b747SChiYuan Huang .name = "rt6160",
31146600ab1SDouglas Anderson .probe_type = PROBE_PREFER_ASYNCHRONOUS,
312de20b747SChiYuan Huang .of_match_table = rt6160_of_match_table,
313de20b747SChiYuan Huang },
314*964e1865SUwe Kleine-König .probe = rt6160_probe,
315de20b747SChiYuan Huang };
316de20b747SChiYuan Huang module_i2c_driver(rt6160_driver);
317de20b747SChiYuan Huang
31823f95199SChiYuan Huang MODULE_DESCRIPTION("Richtek RT6160 voltage regulator driver");
319de20b747SChiYuan Huang MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
320de20b747SChiYuan Huang MODULE_LICENSE("GPL v2");
321