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7b36ddb2 CH |
1 | // SPDX-License-Identifier: GPL-2.0+ |
2 | ||
3 | #include <linux/bits.h> | |
4 | #include <linux/i2c.h> | |
5 | #include <linux/kernel.h> | |
6 | #include <linux/module.h> | |
045a44d4 | 7 | #include <linux/of.h> |
7b36ddb2 CH |
8 | #include <linux/regmap.h> |
9 | #include <linux/regulator/driver.h> | |
10 | #include <linux/regulator/of_regulator.h> | |
11 | ||
12 | #define RT5759_REG_VENDORINFO 0x00 | |
13 | #define RT5759_REG_FREQ 0x01 | |
14 | #define RT5759_REG_VSEL 0x02 | |
15 | #define RT5759_REG_DCDCCTRL 0x03 | |
16 | #define RT5759_REG_STATUS 0x04 | |
17 | #define RT5759_REG_DCDCSET 0x05 | |
18 | #define RT5759A_REG_WDTEN 0x42 | |
19 | ||
20 | #define RT5759_TSTEP_MASK GENMASK(3, 2) | |
21 | #define RT5759_VSEL_MASK GENMASK(6, 0) | |
22 | #define RT5759_DISCHARGE_MASK BIT(3) | |
23 | #define RT5759_FPWM_MASK BIT(2) | |
24 | #define RT5759_ENABLE_MASK BIT(1) | |
25 | #define RT5759_OT_MASK BIT(1) | |
26 | #define RT5759_UV_MASK BIT(0) | |
27 | #define RT5957_OCLVL_MASK GENMASK(7, 6) | |
28 | #define RT5759_OCLVL_SHIFT 6 | |
29 | #define RT5957_OTLVL_MASK GENMASK(5, 4) | |
30 | #define RT5759_OTLVL_SHIFT 4 | |
31 | #define RT5759A_WDTEN_MASK BIT(1) | |
32 | ||
33 | #define RT5759_MANUFACTURER_ID 0x82 | |
34 | /* vsel range 0x00 ~ 0x5A */ | |
35 | #define RT5759_NUM_VOLTS 91 | |
36 | #define RT5759_MIN_UV 600000 | |
37 | #define RT5759_STEP_UV 10000 | |
38 | #define RT5759A_STEP_UV 12500 | |
39 | #define RT5759_MINSS_TIMEUS 1500 | |
40 | ||
41 | #define RT5759_PSKIP_MODE 0 | |
42 | #define RT5759_FPWM_MODE 1 | |
43 | ||
44 | enum { | |
45 | CHIP_TYPE_RT5759 = 0, | |
46 | CHIP_TYPE_RT5759A, | |
47 | CHIP_TYPE_MAX | |
48 | }; | |
49 | ||
50 | struct rt5759_priv { | |
51 | struct device *dev; | |
52 | struct regmap *regmap; | |
53 | struct regulator_desc desc; | |
54 | unsigned long chip_type; | |
55 | }; | |
56 | ||
57 | static int rt5759_set_mode(struct regulator_dev *rdev, unsigned int mode) | |
58 | { | |
59 | struct regmap *regmap = rdev_get_regmap(rdev); | |
60 | unsigned int mode_val; | |
61 | ||
62 | switch (mode) { | |
63 | case REGULATOR_MODE_NORMAL: | |
64 | mode_val = 0; | |
65 | break; | |
66 | case REGULATOR_MODE_FAST: | |
67 | mode_val = RT5759_FPWM_MASK; | |
68 | break; | |
69 | default: | |
70 | return -EINVAL; | |
71 | } | |
72 | ||
73 | return regmap_update_bits(regmap, RT5759_REG_STATUS, RT5759_FPWM_MASK, | |
74 | mode_val); | |
75 | } | |
76 | ||
77 | static unsigned int rt5759_get_mode(struct regulator_dev *rdev) | |
78 | { | |
79 | struct regmap *regmap = rdev_get_regmap(rdev); | |
80 | unsigned int regval; | |
81 | int ret; | |
82 | ||
83 | ret = regmap_read(regmap, RT5759_REG_DCDCCTRL, ®val); | |
84 | if (ret) | |
85 | return REGULATOR_MODE_INVALID; | |
86 | ||
87 | if (regval & RT5759_FPWM_MASK) | |
88 | return REGULATOR_MODE_FAST; | |
89 | ||
90 | return REGULATOR_MODE_NORMAL; | |
91 | } | |
92 | ||
93 | static int rt5759_get_error_flags(struct regulator_dev *rdev, | |
94 | unsigned int *flags) | |
95 | { | |
96 | struct regmap *regmap = rdev_get_regmap(rdev); | |
97 | unsigned int status, events = 0; | |
98 | int ret; | |
99 | ||
100 | ret = regmap_read(regmap, RT5759_REG_STATUS, &status); | |
101 | if (ret) | |
102 | return ret; | |
103 | ||
104 | if (status & RT5759_OT_MASK) | |
105 | events |= REGULATOR_ERROR_OVER_TEMP; | |
106 | ||
107 | if (status & RT5759_UV_MASK) | |
108 | events |= REGULATOR_ERROR_UNDER_VOLTAGE; | |
109 | ||
110 | *flags = events; | |
111 | return 0; | |
112 | } | |
113 | ||
114 | static int rt5759_set_ocp(struct regulator_dev *rdev, int lim_uA, int severity, | |
115 | bool enable) | |
116 | { | |
117 | struct regmap *regmap = rdev_get_regmap(rdev); | |
118 | int ocp_lvl[] = { 9800000, 10800000, 11800000 }; | |
119 | unsigned int ocp_regval; | |
120 | int i; | |
121 | ||
122 | /* Only support over current protection parameter */ | |
123 | if (severity != REGULATOR_SEVERITY_PROT) | |
124 | return 0; | |
125 | ||
126 | if (enable) { | |
127 | /* Default ocp level is 10.8A */ | |
128 | if (lim_uA == 0) | |
129 | lim_uA = 10800000; | |
130 | ||
131 | for (i = 0; i < ARRAY_SIZE(ocp_lvl); i++) { | |
132 | if (lim_uA <= ocp_lvl[i]) | |
133 | break; | |
134 | } | |
135 | ||
136 | if (i == ARRAY_SIZE(ocp_lvl)) | |
137 | i = ARRAY_SIZE(ocp_lvl) - 1; | |
138 | ||
139 | ocp_regval = i + 1; | |
140 | } else | |
141 | ocp_regval = 0; | |
142 | ||
143 | return regmap_update_bits(regmap, RT5759_REG_DCDCSET, RT5957_OCLVL_MASK, | |
144 | ocp_regval << RT5759_OCLVL_SHIFT); | |
145 | } | |
146 | ||
147 | static int rt5759_set_otp(struct regulator_dev *rdev, int lim, int severity, | |
148 | bool enable) | |
149 | { | |
150 | struct regmap *regmap = rdev_get_regmap(rdev); | |
151 | int otp_lvl[] = { 140, 150, 170 }; | |
152 | unsigned int otp_regval; | |
153 | int i; | |
154 | ||
155 | /* Only support over temperature protection parameter */ | |
156 | if (severity != REGULATOR_SEVERITY_PROT) | |
157 | return 0; | |
158 | ||
159 | if (enable) { | |
160 | /* Default otp level is 150'c */ | |
161 | if (lim == 0) | |
162 | lim = 150; | |
163 | ||
164 | for (i = 0; i < ARRAY_SIZE(otp_lvl); i++) { | |
165 | if (lim <= otp_lvl[i]) | |
166 | break; | |
167 | } | |
168 | ||
169 | if (i == ARRAY_SIZE(otp_lvl)) | |
170 | i = ARRAY_SIZE(otp_lvl) - 1; | |
171 | ||
172 | otp_regval = i + 1; | |
173 | } else | |
174 | otp_regval = 0; | |
175 | ||
176 | return regmap_update_bits(regmap, RT5759_REG_DCDCSET, RT5957_OTLVL_MASK, | |
177 | otp_regval << RT5759_OTLVL_SHIFT); | |
178 | } | |
179 | ||
180 | static const struct regulator_ops rt5759_regulator_ops = { | |
181 | .list_voltage = regulator_list_voltage_linear, | |
182 | .set_voltage_sel = regulator_set_voltage_sel_regmap, | |
183 | .get_voltage_sel = regulator_get_voltage_sel_regmap, | |
184 | .enable = regulator_enable_regmap, | |
185 | .disable = regulator_disable_regmap, | |
186 | .is_enabled = regulator_is_enabled_regmap, | |
187 | .set_active_discharge = regulator_set_active_discharge_regmap, | |
188 | .set_mode = rt5759_set_mode, | |
189 | .get_mode = rt5759_get_mode, | |
190 | .set_ramp_delay = regulator_set_ramp_delay_regmap, | |
191 | .get_error_flags = rt5759_get_error_flags, | |
192 | .set_over_current_protection = rt5759_set_ocp, | |
193 | .set_thermal_protection = rt5759_set_otp, | |
194 | }; | |
195 | ||
196 | static unsigned int rt5759_of_map_mode(unsigned int mode) | |
197 | { | |
198 | switch (mode) { | |
199 | case RT5759_FPWM_MODE: | |
200 | return REGULATOR_MODE_FAST; | |
201 | case RT5759_PSKIP_MODE: | |
202 | return REGULATOR_MODE_NORMAL; | |
203 | default: | |
204 | return REGULATOR_MODE_INVALID; | |
205 | } | |
206 | } | |
207 | ||
208 | static const unsigned int rt5759_ramp_table[] = { 20000, 15000, 10000, 5000 }; | |
209 | ||
210 | static int rt5759_regulator_register(struct rt5759_priv *priv) | |
211 | { | |
212 | struct device_node *np = priv->dev->of_node; | |
213 | struct regulator_desc *reg_desc = &priv->desc; | |
214 | struct regulator_config reg_cfg; | |
215 | struct regulator_dev *rdev; | |
216 | int ret; | |
217 | ||
218 | reg_desc->name = "rt5759-buck"; | |
219 | reg_desc->type = REGULATOR_VOLTAGE; | |
220 | reg_desc->owner = THIS_MODULE; | |
221 | reg_desc->ops = &rt5759_regulator_ops; | |
222 | reg_desc->n_voltages = RT5759_NUM_VOLTS; | |
223 | reg_desc->min_uV = RT5759_MIN_UV; | |
224 | reg_desc->uV_step = RT5759_STEP_UV; | |
225 | reg_desc->vsel_reg = RT5759_REG_VSEL; | |
226 | reg_desc->vsel_mask = RT5759_VSEL_MASK; | |
227 | reg_desc->enable_reg = RT5759_REG_DCDCCTRL; | |
228 | reg_desc->enable_mask = RT5759_ENABLE_MASK; | |
229 | reg_desc->active_discharge_reg = RT5759_REG_DCDCCTRL; | |
230 | reg_desc->active_discharge_mask = RT5759_DISCHARGE_MASK; | |
231 | reg_desc->active_discharge_on = RT5759_DISCHARGE_MASK; | |
232 | reg_desc->ramp_reg = RT5759_REG_FREQ; | |
233 | reg_desc->ramp_mask = RT5759_TSTEP_MASK; | |
234 | reg_desc->ramp_delay_table = rt5759_ramp_table; | |
235 | reg_desc->n_ramp_values = ARRAY_SIZE(rt5759_ramp_table); | |
236 | reg_desc->enable_time = RT5759_MINSS_TIMEUS; | |
237 | reg_desc->of_map_mode = rt5759_of_map_mode; | |
238 | ||
239 | /* | |
240 | * RT5759 step uV = 10000 | |
241 | * RT5759A step uV = 12500 | |
242 | */ | |
243 | if (priv->chip_type == CHIP_TYPE_RT5759A) | |
244 | reg_desc->uV_step = RT5759A_STEP_UV; | |
245 | ||
7920e0fb | 246 | memset(®_cfg, 0, sizeof(reg_cfg)); |
7b36ddb2 CH |
247 | reg_cfg.dev = priv->dev; |
248 | reg_cfg.of_node = np; | |
249 | reg_cfg.init_data = of_get_regulator_init_data(priv->dev, np, reg_desc); | |
250 | reg_cfg.regmap = priv->regmap; | |
251 | ||
252 | rdev = devm_regulator_register(priv->dev, reg_desc, ®_cfg); | |
253 | if (IS_ERR(rdev)) { | |
254 | ret = PTR_ERR(rdev); | |
255 | dev_err(priv->dev, "Failed to register regulator (%d)\n", ret); | |
256 | return ret; | |
257 | } | |
258 | ||
259 | return 0; | |
260 | } | |
261 | ||
262 | static int rt5759_init_device_property(struct rt5759_priv *priv) | |
263 | { | |
264 | unsigned int val = 0; | |
265 | ||
266 | /* | |
267 | * Only RT5759A support external watchdog input | |
268 | */ | |
269 | if (priv->chip_type != CHIP_TYPE_RT5759A) | |
270 | return 0; | |
271 | ||
272 | if (device_property_read_bool(priv->dev, "richtek,watchdog-enable")) | |
273 | val = RT5759A_WDTEN_MASK; | |
274 | ||
275 | return regmap_update_bits(priv->regmap, RT5759A_REG_WDTEN, | |
276 | RT5759A_WDTEN_MASK, val); | |
277 | } | |
278 | ||
279 | static int rt5759_manufacturer_check(struct rt5759_priv *priv) | |
280 | { | |
281 | unsigned int vendor; | |
282 | int ret; | |
283 | ||
284 | ret = regmap_read(priv->regmap, RT5759_REG_VENDORINFO, &vendor); | |
285 | if (ret) | |
286 | return ret; | |
287 | ||
288 | if (vendor != RT5759_MANUFACTURER_ID) { | |
289 | dev_err(priv->dev, "vendor info not correct (%d)\n", vendor); | |
290 | return -EINVAL; | |
291 | } | |
292 | ||
293 | return 0; | |
294 | } | |
295 | ||
296 | static bool rt5759_is_accessible_reg(struct device *dev, unsigned int reg) | |
297 | { | |
298 | struct rt5759_priv *priv = dev_get_drvdata(dev); | |
299 | ||
300 | if (reg <= RT5759_REG_DCDCSET) | |
301 | return true; | |
302 | ||
303 | if (priv->chip_type == CHIP_TYPE_RT5759A && reg == RT5759A_REG_WDTEN) | |
304 | return true; | |
305 | ||
306 | return false; | |
307 | } | |
308 | ||
309 | static const struct regmap_config rt5759_regmap_config = { | |
310 | .reg_bits = 8, | |
311 | .val_bits = 8, | |
312 | .max_register = RT5759A_REG_WDTEN, | |
313 | .readable_reg = rt5759_is_accessible_reg, | |
314 | .writeable_reg = rt5759_is_accessible_reg, | |
315 | }; | |
316 | ||
317 | static int rt5759_probe(struct i2c_client *i2c) | |
318 | { | |
319 | struct rt5759_priv *priv; | |
320 | int ret; | |
321 | ||
322 | priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL); | |
323 | if (!priv) | |
324 | return -ENOMEM; | |
325 | ||
326 | priv->dev = &i2c->dev; | |
327 | priv->chip_type = (unsigned long)of_device_get_match_data(&i2c->dev); | |
328 | i2c_set_clientdata(i2c, priv); | |
329 | ||
330 | priv->regmap = devm_regmap_init_i2c(i2c, &rt5759_regmap_config); | |
331 | if (IS_ERR(priv->regmap)) { | |
332 | ret = PTR_ERR(priv->regmap); | |
333 | dev_err(&i2c->dev, "Failed to allocate regmap (%d)\n", ret); | |
334 | return ret; | |
335 | } | |
336 | ||
337 | ret = rt5759_manufacturer_check(priv); | |
338 | if (ret) { | |
339 | dev_err(&i2c->dev, "Failed to check device (%d)\n", ret); | |
340 | return ret; | |
341 | } | |
342 | ||
343 | ret = rt5759_init_device_property(priv); | |
344 | if (ret) { | |
345 | dev_err(&i2c->dev, "Failed to init device (%d)\n", ret); | |
346 | return ret; | |
347 | } | |
348 | ||
349 | return rt5759_regulator_register(priv); | |
350 | } | |
351 | ||
352 | static const struct of_device_id __maybe_unused rt5759_device_table[] = { | |
353 | { .compatible = "richtek,rt5759", .data = (void *)CHIP_TYPE_RT5759 }, | |
354 | { .compatible = "richtek,rt5759a", .data = (void *)CHIP_TYPE_RT5759A }, | |
355 | {} | |
356 | }; | |
357 | MODULE_DEVICE_TABLE(of, rt5759_device_table); | |
358 | ||
359 | static struct i2c_driver rt5759_driver = { | |
360 | .driver = { | |
361 | .name = "rt5759", | |
41cff178 | 362 | .probe_type = PROBE_PREFER_ASYNCHRONOUS, |
7b36ddb2 CH |
363 | .of_match_table = of_match_ptr(rt5759_device_table), |
364 | }, | |
964e1865 | 365 | .probe = rt5759_probe, |
7b36ddb2 CH |
366 | }; |
367 | module_i2c_driver(rt5759_driver); | |
368 | ||
369 | MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>"); | |
370 | MODULE_DESCRIPTION("Richtek RT5759 Regulator Driver"); | |
371 | MODULE_LICENSE("GPL v2"); |