1 // SPDX-License-Identifier: GPL-2.0-only
2
3 #include <linux/delay.h>
4 #include <linux/gpio/consumer.h>
5 #include <linux/i2c.h>
6 #include <linux/kernel.h>
7 #include <linux/module.h>
8 #include <linux/property.h>
9 #include <linux/regmap.h>
10 #include <linux/regulator/driver.h>
11 #include <linux/regulator/of_regulator.h>
12
13 #define RT6160_MODE_AUTO 0
14 #define RT6160_MODE_FPWM 1
15
16 #define RT6160_REG_CNTL 0x01
17 #define RT6160_REG_STATUS 0x02
18 #define RT6160_REG_DEVID 0x03
19 #define RT6160_REG_VSELL 0x04
20 #define RT6160_REG_VSELH 0x05
21 #define RT6160_NUM_REGS (RT6160_REG_VSELH + 1)
22
23 #define RT6160_FPWM_MASK BIT(3)
24 #define RT6160_RAMPRATE_MASK GENMASK(1, 0)
25 #define RT6160_VID_MASK GENMASK(7, 4)
26 #define RT6160_VSEL_MASK GENMASK(6, 0)
27 #define RT6160_HDSTAT_MASK BIT(4)
28 #define RT6160_UVSTAT_MASK BIT(3)
29 #define RT6160_OCSTAT_MASK BIT(2)
30 #define RT6160_TSDSTAT_MASK BIT(1)
31 #define RT6160_PGSTAT_MASK BIT(0)
32
33 #define RT6160_VENDOR_ID 0xA0
34 #define RT6166_VENDOR_ID 0xB0
35 #define RT6160_VOUT_MINUV 2025000
36 #define RT6160_VOUT_MAXUV 5200000
37 #define RT6166_VOUT_MINUV 1800000
38 #define RT6166_VOUD_MAXUV 4950000
39 #define RT6160_VOUT_STPUV 25000
40 #define RT6160_N_VOUTS ((RT6160_VOUT_MAXUV - RT6160_VOUT_MINUV) / RT6160_VOUT_STPUV + 1)
41
42 #define RT6160_I2CRDY_TIMEUS 100
43
44 struct rt6160_priv {
45 struct regulator_desc desc;
46 struct gpio_desc *enable_gpio;
47 struct regmap *regmap;
48 bool enable_state;
49 uint8_t devid;
50 };
51
52 static const unsigned int rt6160_ramp_tables[] = {
53 1000, 2500, 5000, 10000
54 };
55
rt6160_enable(struct regulator_dev * rdev)56 static int rt6160_enable(struct regulator_dev *rdev)
57 {
58 struct rt6160_priv *priv = rdev_get_drvdata(rdev);
59
60 if (!priv->enable_gpio)
61 return 0;
62
63 gpiod_set_value_cansleep(priv->enable_gpio, 1);
64 priv->enable_state = true;
65
66 usleep_range(RT6160_I2CRDY_TIMEUS, RT6160_I2CRDY_TIMEUS + 100);
67
68 regcache_cache_only(priv->regmap, false);
69 return regcache_sync(priv->regmap);
70 }
71
rt6160_disable(struct regulator_dev * rdev)72 static int rt6160_disable(struct regulator_dev *rdev)
73 {
74 struct rt6160_priv *priv = rdev_get_drvdata(rdev);
75
76 if (!priv->enable_gpio)
77 return -EINVAL;
78
79 /* Mark regcache as dirty and cache only before HW disabled */
80 regcache_cache_only(priv->regmap, true);
81 regcache_mark_dirty(priv->regmap);
82
83 priv->enable_state = false;
84 gpiod_set_value_cansleep(priv->enable_gpio, 0);
85
86 return 0;
87 }
88
rt6160_is_enabled(struct regulator_dev * rdev)89 static int rt6160_is_enabled(struct regulator_dev *rdev)
90 {
91 struct rt6160_priv *priv = rdev_get_drvdata(rdev);
92
93 return priv->enable_state ? 1 : 0;
94 }
95
rt6160_set_mode(struct regulator_dev * rdev,unsigned int mode)96 static int rt6160_set_mode(struct regulator_dev *rdev, unsigned int mode)
97 {
98 struct regmap *regmap = rdev_get_regmap(rdev);
99 unsigned int mode_val;
100
101 switch (mode) {
102 case REGULATOR_MODE_FAST:
103 mode_val = RT6160_FPWM_MASK;
104 break;
105 case REGULATOR_MODE_NORMAL:
106 mode_val = 0;
107 break;
108 default:
109 dev_err(&rdev->dev, "mode not supported\n");
110 return -EINVAL;
111 }
112
113 return regmap_update_bits(regmap, RT6160_REG_CNTL, RT6160_FPWM_MASK, mode_val);
114 }
115
rt6160_get_mode(struct regulator_dev * rdev)116 static unsigned int rt6160_get_mode(struct regulator_dev *rdev)
117 {
118 struct regmap *regmap = rdev_get_regmap(rdev);
119 unsigned int val;
120 int ret;
121
122 ret = regmap_read(regmap, RT6160_REG_CNTL, &val);
123 if (ret)
124 return ret;
125
126 if (val & RT6160_FPWM_MASK)
127 return REGULATOR_MODE_FAST;
128
129 return REGULATOR_MODE_NORMAL;
130 }
131
rt6160_set_suspend_voltage(struct regulator_dev * rdev,int uV)132 static int rt6160_set_suspend_voltage(struct regulator_dev *rdev, int uV)
133 {
134 struct regmap *regmap = rdev_get_regmap(rdev);
135 unsigned int suspend_vsel_reg;
136 int vsel;
137
138 vsel = regulator_map_voltage_linear(rdev, uV, uV);
139 if (vsel < 0)
140 return vsel;
141
142 if (rdev->desc->vsel_reg == RT6160_REG_VSELL)
143 suspend_vsel_reg = RT6160_REG_VSELH;
144 else
145 suspend_vsel_reg = RT6160_REG_VSELL;
146
147 return regmap_update_bits(regmap, suspend_vsel_reg,
148 RT6160_VSEL_MASK, vsel);
149 }
150
rt6160_get_error_flags(struct regulator_dev * rdev,unsigned int * flags)151 static int rt6160_get_error_flags(struct regulator_dev *rdev, unsigned int *flags)
152 {
153 struct regmap *regmap = rdev_get_regmap(rdev);
154 unsigned int val, events = 0;
155 int ret;
156
157 ret = regmap_read(regmap, RT6160_REG_STATUS, &val);
158 if (ret)
159 return ret;
160
161 if (val & (RT6160_HDSTAT_MASK | RT6160_TSDSTAT_MASK))
162 events |= REGULATOR_ERROR_OVER_TEMP;
163
164 if (val & RT6160_UVSTAT_MASK)
165 events |= REGULATOR_ERROR_UNDER_VOLTAGE;
166
167 if (val & RT6160_OCSTAT_MASK)
168 events |= REGULATOR_ERROR_OVER_CURRENT;
169
170 if (val & RT6160_PGSTAT_MASK)
171 events |= REGULATOR_ERROR_FAIL;
172
173 *flags = events;
174 return 0;
175 }
176
177 static const struct regulator_ops rt6160_regulator_ops = {
178 .list_voltage = regulator_list_voltage_linear,
179 .set_voltage_sel = regulator_set_voltage_sel_regmap,
180 .get_voltage_sel = regulator_get_voltage_sel_regmap,
181
182 .enable = rt6160_enable,
183 .disable = rt6160_disable,
184 .is_enabled = rt6160_is_enabled,
185
186 .set_mode = rt6160_set_mode,
187 .get_mode = rt6160_get_mode,
188 .set_suspend_voltage = rt6160_set_suspend_voltage,
189 .set_ramp_delay = regulator_set_ramp_delay_regmap,
190 .get_error_flags = rt6160_get_error_flags,
191 };
192
rt6160_of_map_mode(unsigned int mode)193 static unsigned int rt6160_of_map_mode(unsigned int mode)
194 {
195 switch (mode) {
196 case RT6160_MODE_FPWM:
197 return REGULATOR_MODE_FAST;
198 case RT6160_MODE_AUTO:
199 return REGULATOR_MODE_NORMAL;
200 }
201
202 return REGULATOR_MODE_INVALID;
203 }
204
rt6160_is_accessible_reg(struct device * dev,unsigned int reg)205 static bool rt6160_is_accessible_reg(struct device *dev, unsigned int reg)
206 {
207 if (reg >= RT6160_REG_CNTL && reg <= RT6160_REG_VSELH)
208 return true;
209 return false;
210 }
211
rt6160_is_volatile_reg(struct device * dev,unsigned int reg)212 static bool rt6160_is_volatile_reg(struct device *dev, unsigned int reg)
213 {
214 if (reg == RT6160_REG_STATUS)
215 return true;
216 return false;
217 }
218
219 static const struct regmap_config rt6160_regmap_config = {
220 .reg_bits = 8,
221 .val_bits = 8,
222 .max_register = RT6160_REG_VSELH,
223 .num_reg_defaults_raw = RT6160_NUM_REGS,
224 .cache_type = REGCACHE_FLAT,
225
226 .writeable_reg = rt6160_is_accessible_reg,
227 .readable_reg = rt6160_is_accessible_reg,
228 .volatile_reg = rt6160_is_volatile_reg,
229 };
230
rt6160_probe(struct i2c_client * i2c)231 static int rt6160_probe(struct i2c_client *i2c)
232 {
233 struct rt6160_priv *priv;
234 struct regulator_config regulator_cfg = {};
235 struct regulator_dev *rdev;
236 bool vsel_active_low;
237 unsigned int devid;
238 int ret;
239
240 priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL);
241 if (!priv)
242 return -ENOMEM;
243
244 vsel_active_low =
245 device_property_present(&i2c->dev, "richtek,vsel-active-low");
246
247 priv->enable_gpio = devm_gpiod_get_optional(&i2c->dev, "enable", GPIOD_OUT_HIGH);
248 if (IS_ERR(priv->enable_gpio)) {
249 dev_err(&i2c->dev, "Failed to get 'enable' gpio\n");
250 return PTR_ERR(priv->enable_gpio);
251 }
252 priv->enable_state = true;
253
254 usleep_range(RT6160_I2CRDY_TIMEUS, RT6160_I2CRDY_TIMEUS + 100);
255
256 priv->regmap = devm_regmap_init_i2c(i2c, &rt6160_regmap_config);
257 if (IS_ERR(priv->regmap)) {
258 ret = PTR_ERR(priv->regmap);
259 dev_err(&i2c->dev, "Failed to init regmap (%d)\n", ret);
260 return ret;
261 }
262
263 ret = regmap_read(priv->regmap, RT6160_REG_DEVID, &devid);
264 if (ret)
265 return ret;
266
267 devid = devid & RT6160_VID_MASK;
268
269 switch (devid) {
270 case RT6166_VENDOR_ID:
271 case RT6160_VENDOR_ID:
272 break;
273 default:
274 dev_err(&i2c->dev, "VID not correct [0x%02x]\n", devid);
275 return -ENODEV;
276 }
277
278 priv->devid = devid;
279
280 priv->desc.name = "rt6160-buckboost";
281 priv->desc.type = REGULATOR_VOLTAGE;
282 priv->desc.owner = THIS_MODULE;
283 if (priv->devid == RT6166_VENDOR_ID)
284 priv->desc.min_uV = RT6166_VOUT_MINUV;
285 else
286 priv->desc.min_uV = RT6160_VOUT_MINUV;
287 priv->desc.uV_step = RT6160_VOUT_STPUV;
288 if (vsel_active_low)
289 priv->desc.vsel_reg = RT6160_REG_VSELL;
290 else
291 priv->desc.vsel_reg = RT6160_REG_VSELH;
292 priv->desc.vsel_mask = RT6160_VSEL_MASK;
293 priv->desc.n_voltages = RT6160_N_VOUTS;
294 priv->desc.ramp_reg = RT6160_REG_CNTL;
295 priv->desc.ramp_mask = RT6160_RAMPRATE_MASK;
296 priv->desc.ramp_delay_table = rt6160_ramp_tables;
297 priv->desc.n_ramp_values = ARRAY_SIZE(rt6160_ramp_tables);
298 priv->desc.of_map_mode = rt6160_of_map_mode;
299 priv->desc.ops = &rt6160_regulator_ops;
300
301 regulator_cfg.dev = &i2c->dev;
302 regulator_cfg.of_node = i2c->dev.of_node;
303 regulator_cfg.regmap = priv->regmap;
304 regulator_cfg.driver_data = priv;
305 regulator_cfg.init_data = of_get_regulator_init_data(&i2c->dev, i2c->dev.of_node,
306 &priv->desc);
307
308 rdev = devm_regulator_register(&i2c->dev, &priv->desc, ®ulator_cfg);
309 if (IS_ERR(rdev)) {
310 dev_err(&i2c->dev, "Failed to register regulator\n");
311 return PTR_ERR(rdev);
312 }
313
314 return 0;
315 }
316
317 static const struct of_device_id __maybe_unused rt6160_of_match_table[] = {
318 { .compatible = "richtek,rt6160", },
319 {}
320 };
321 MODULE_DEVICE_TABLE(of, rt6160_of_match_table);
322
323 static struct i2c_driver rt6160_driver = {
324 .driver = {
325 .name = "rt6160",
326 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
327 .of_match_table = rt6160_of_match_table,
328 },
329 .probe = rt6160_probe,
330 };
331 module_i2c_driver(rt6160_driver);
332
333 MODULE_DESCRIPTION("Richtek RT6160 voltage regulator driver");
334 MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
335 MODULE_LICENSE("GPL v2");
336