1// SPDX-License-Identifier: GPL-2.0
2//
3// MP8867/MP8869 regulator driver
4//
5// Copyright (C) 2020 Synaptics Incorporated
6//
7// Author: Jisheng Zhang <jszhang@kernel.org>
8
9#include <linux/gpio/consumer.h>
10#include <linux/i2c.h>
11#include <linux/module.h>
12#include <linux/of.h>
13#include <linux/regmap.h>
14#include <linux/regulator/driver.h>
15#include <linux/regulator/of_regulator.h>
16
17#define MP886X_VSEL 0x00
18#define MP886X_V_BOOT (1 << 7)
19#define MP886X_SYSCNTLREG1 0x01
20#define MP886X_MODE (1 << 0)
21#define MP886X_SLEW_SHIFT 3
22#define MP886X_SLEW_MASK (0x7 << MP886X_SLEW_SHIFT)
23#define MP886X_GO (1 << 6)
24#define MP886X_EN (1 << 7)
25#define MP8869_SYSCNTLREG2 0x02
26
27struct mp886x_cfg_info {
28 const struct regulator_ops *rops;
29 const unsigned int slew_rates[8];
30 const int switch_freq[4];
31 const u8 fs_reg;
32 const u8 fs_shift;
33};
34
35struct mp886x_device_info {
36 struct device *dev;
37 struct regulator_desc desc;
38 struct regulator_init_data *regulator;
39 struct gpio_desc *en_gpio;
40 const struct mp886x_cfg_info *ci;
41 u32 r[2];
42 unsigned int sel;
43};
44
45static void mp886x_set_switch_freq(struct mp886x_device_info *di,
46 struct regmap *regmap,
47 u32 freq)
48{
49 const struct mp886x_cfg_info *ci = di->ci;
50 int i;
51
52 for (i = 0; i < ARRAY_SIZE(ci->switch_freq); i++) {
53 if (freq == ci->switch_freq[i]) {
54 regmap_update_bits(map: regmap, reg: ci->fs_reg,
55 mask: 0x3 << ci->fs_shift, val: i << ci->fs_shift);
56 return;
57 }
58 }
59
60 dev_err(di->dev, "invalid frequency %d\n", freq);
61}
62
63static int mp886x_set_mode(struct regulator_dev *rdev, unsigned int mode)
64{
65 switch (mode) {
66 case REGULATOR_MODE_FAST:
67 regmap_update_bits(map: rdev->regmap, MP886X_SYSCNTLREG1,
68 MP886X_MODE, MP886X_MODE);
69 break;
70 case REGULATOR_MODE_NORMAL:
71 regmap_update_bits(map: rdev->regmap, MP886X_SYSCNTLREG1,
72 MP886X_MODE, val: 0);
73 break;
74 default:
75 return -EINVAL;
76 }
77 return 0;
78}
79
80static unsigned int mp886x_get_mode(struct regulator_dev *rdev)
81{
82 u32 val;
83 int ret;
84
85 ret = regmap_read(map: rdev->regmap, MP886X_SYSCNTLREG1, val: &val);
86 if (ret < 0)
87 return ret;
88 if (val & MP886X_MODE)
89 return REGULATOR_MODE_FAST;
90 else
91 return REGULATOR_MODE_NORMAL;
92}
93
94static int mp8869_set_voltage_sel(struct regulator_dev *rdev, unsigned int sel)
95{
96 int ret;
97
98 ret = regmap_update_bits(map: rdev->regmap, MP886X_SYSCNTLREG1,
99 MP886X_GO, MP886X_GO);
100 if (ret < 0)
101 return ret;
102
103 sel <<= ffs(rdev->desc->vsel_mask) - 1;
104 return regmap_update_bits(map: rdev->regmap, reg: rdev->desc->vsel_reg,
105 MP886X_V_BOOT | rdev->desc->vsel_mask, val: sel);
106}
107
108static inline unsigned int mp8869_scale(unsigned int uv, u32 r1, u32 r2)
109{
110 u32 tmp = uv * r1 / r2;
111
112 return uv + tmp;
113}
114
115static int mp8869_get_voltage_sel(struct regulator_dev *rdev)
116{
117 struct mp886x_device_info *di = rdev_get_drvdata(rdev);
118 int ret, uv;
119 unsigned int val;
120 bool fbloop;
121
122 ret = regmap_read(map: rdev->regmap, reg: rdev->desc->vsel_reg, val: &val);
123 if (ret)
124 return ret;
125
126 fbloop = val & MP886X_V_BOOT;
127 if (fbloop) {
128 uv = rdev->desc->min_uV;
129 uv = mp8869_scale(uv, r1: di->r[0], r2: di->r[1]);
130 return regulator_map_voltage_linear(rdev, min_uV: uv, max_uV: uv);
131 }
132
133 val &= rdev->desc->vsel_mask;
134 val >>= ffs(rdev->desc->vsel_mask) - 1;
135
136 return val;
137}
138
139static const struct regulator_ops mp8869_regulator_ops = {
140 .set_voltage_sel = mp8869_set_voltage_sel,
141 .get_voltage_sel = mp8869_get_voltage_sel,
142 .set_voltage_time_sel = regulator_set_voltage_time_sel,
143 .map_voltage = regulator_map_voltage_linear,
144 .list_voltage = regulator_list_voltage_linear,
145 .enable = regulator_enable_regmap,
146 .disable = regulator_disable_regmap,
147 .is_enabled = regulator_is_enabled_regmap,
148 .set_mode = mp886x_set_mode,
149 .get_mode = mp886x_get_mode,
150 .set_ramp_delay = regulator_set_ramp_delay_regmap,
151};
152
153static const struct mp886x_cfg_info mp8869_ci = {
154 .rops = &mp8869_regulator_ops,
155 .slew_rates = {
156 40000,
157 30000,
158 20000,
159 10000,
160 5000,
161 2500,
162 1250,
163 625,
164 },
165 .switch_freq = {
166 500000,
167 750000,
168 1000000,
169 1250000,
170 },
171 .fs_reg = MP8869_SYSCNTLREG2,
172 .fs_shift = 4,
173};
174
175static int mp8867_set_voltage_sel(struct regulator_dev *rdev, unsigned int sel)
176{
177 struct mp886x_device_info *di = rdev_get_drvdata(rdev);
178 int ret, delta;
179
180 ret = mp8869_set_voltage_sel(rdev, sel);
181 if (ret < 0)
182 return ret;
183
184 delta = di->sel - sel;
185 if (abs(delta) <= 5)
186 ret = regmap_update_bits(map: rdev->regmap, MP886X_SYSCNTLREG1,
187 MP886X_GO, val: 0);
188 di->sel = sel;
189
190 return ret;
191}
192
193static int mp8867_get_voltage_sel(struct regulator_dev *rdev)
194{
195 struct mp886x_device_info *di = rdev_get_drvdata(rdev);
196 int ret, uv;
197 unsigned int val;
198 bool fbloop;
199
200 ret = regmap_read(map: rdev->regmap, reg: rdev->desc->vsel_reg, val: &val);
201 if (ret)
202 return ret;
203
204 fbloop = val & MP886X_V_BOOT;
205
206 val &= rdev->desc->vsel_mask;
207 val >>= ffs(rdev->desc->vsel_mask) - 1;
208
209 if (fbloop) {
210 uv = regulator_list_voltage_linear(rdev, selector: val);
211 uv = mp8869_scale(uv, r1: di->r[0], r2: di->r[1]);
212 return regulator_map_voltage_linear(rdev, min_uV: uv, max_uV: uv);
213 }
214
215 return val;
216}
217
218static const struct regulator_ops mp8867_regulator_ops = {
219 .set_voltage_sel = mp8867_set_voltage_sel,
220 .get_voltage_sel = mp8867_get_voltage_sel,
221 .set_voltage_time_sel = regulator_set_voltage_time_sel,
222 .map_voltage = regulator_map_voltage_linear,
223 .list_voltage = regulator_list_voltage_linear,
224 .enable = regulator_enable_regmap,
225 .disable = regulator_disable_regmap,
226 .is_enabled = regulator_is_enabled_regmap,
227 .set_mode = mp886x_set_mode,
228 .get_mode = mp886x_get_mode,
229 .set_ramp_delay = regulator_set_ramp_delay_regmap,
230};
231
232static const struct mp886x_cfg_info mp8867_ci = {
233 .rops = &mp8867_regulator_ops,
234 .slew_rates = {
235 64000,
236 32000,
237 16000,
238 8000,
239 4000,
240 2000,
241 1000,
242 500,
243 },
244 .switch_freq = {
245 500000,
246 750000,
247 1000000,
248 1500000,
249 },
250 .fs_reg = MP886X_SYSCNTLREG1,
251 .fs_shift = 1,
252};
253
254static int mp886x_regulator_register(struct mp886x_device_info *di,
255 struct regulator_config *config)
256{
257 struct regulator_desc *rdesc = &di->desc;
258 struct regulator_dev *rdev;
259
260 rdesc->name = "mp886x-reg";
261 rdesc->supply_name = "vin";
262 rdesc->ops = di->ci->rops;
263 rdesc->type = REGULATOR_VOLTAGE;
264 rdesc->n_voltages = 128;
265 rdesc->enable_reg = MP886X_SYSCNTLREG1;
266 rdesc->enable_mask = MP886X_EN;
267 rdesc->min_uV = 600000;
268 rdesc->uV_step = 10000;
269 rdesc->vsel_reg = MP886X_VSEL;
270 rdesc->vsel_mask = 0x3f;
271 rdesc->ramp_reg = MP886X_SYSCNTLREG1;
272 rdesc->ramp_mask = MP886X_SLEW_MASK;
273 rdesc->ramp_delay_table = di->ci->slew_rates;
274 rdesc->n_ramp_values = ARRAY_SIZE(di->ci->slew_rates);
275 rdesc->owner = THIS_MODULE;
276
277 rdev = devm_regulator_register(dev: di->dev, regulator_desc: &di->desc, config);
278 if (IS_ERR(ptr: rdev))
279 return PTR_ERR(ptr: rdev);
280 di->sel = rdesc->ops->get_voltage_sel(rdev);
281 return 0;
282}
283
284static const struct regmap_config mp886x_regmap_config = {
285 .reg_bits = 8,
286 .val_bits = 8,
287};
288
289static int mp886x_i2c_probe(struct i2c_client *client)
290{
291 struct device *dev = &client->dev;
292 struct device_node *np = dev->of_node;
293 struct mp886x_device_info *di;
294 struct regulator_config config = { };
295 struct regmap *regmap;
296 u32 freq;
297 int ret;
298
299 di = devm_kzalloc(dev, size: sizeof(struct mp886x_device_info), GFP_KERNEL);
300 if (!di)
301 return -ENOMEM;
302
303 di->regulator = of_get_regulator_init_data(dev, node: np, desc: &di->desc);
304 if (!di->regulator) {
305 dev_err(dev, "Platform data not found!\n");
306 return -EINVAL;
307 }
308
309 ret = of_property_read_u32_array(np, propname: "mps,fb-voltage-divider",
310 out_values: di->r, sz: 2);
311 if (ret)
312 return ret;
313
314 di->en_gpio = devm_gpiod_get(dev, con_id: "enable", flags: GPIOD_OUT_HIGH);
315 if (IS_ERR(ptr: di->en_gpio))
316 return PTR_ERR(ptr: di->en_gpio);
317
318 di->ci = i2c_get_match_data(client);
319 di->dev = dev;
320
321 regmap = devm_regmap_init_i2c(client, &mp886x_regmap_config);
322 if (IS_ERR(ptr: regmap)) {
323 dev_err(dev, "Failed to allocate regmap!\n");
324 return PTR_ERR(ptr: regmap);
325 }
326 i2c_set_clientdata(client, data: di);
327
328 config.dev = di->dev;
329 config.init_data = di->regulator;
330 config.regmap = regmap;
331 config.driver_data = di;
332 config.of_node = np;
333
334 if (!of_property_read_u32(np, propname: "mps,switch-frequency-hz", out_value: &freq))
335 mp886x_set_switch_freq(di, regmap, freq);
336
337 ret = mp886x_regulator_register(di, config: &config);
338 if (ret < 0)
339 dev_err(dev, "Failed to register regulator!\n");
340 return ret;
341}
342
343static const struct of_device_id mp886x_dt_ids[] = {
344 { .compatible = "mps,mp8867", .data = &mp8867_ci },
345 { .compatible = "mps,mp8869", .data = &mp8869_ci },
346 { }
347};
348MODULE_DEVICE_TABLE(of, mp886x_dt_ids);
349
350static const struct i2c_device_id mp886x_id[] = {
351 { "mp8867", (kernel_ulong_t)&mp8867_ci },
352 { "mp8869", (kernel_ulong_t)&mp8869_ci },
353 { },
354};
355MODULE_DEVICE_TABLE(i2c, mp886x_id);
356
357static struct i2c_driver mp886x_regulator_driver = {
358 .driver = {
359 .name = "mp886x-regulator",
360 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
361 .of_match_table = mp886x_dt_ids,
362 },
363 .probe = mp886x_i2c_probe,
364 .id_table = mp886x_id,
365};
366module_i2c_driver(mp886x_regulator_driver);
367
368MODULE_AUTHOR("Jisheng Zhang <jszhang@kernel.org>");
369MODULE_DESCRIPTION("MP886x regulator driver");
370MODULE_LICENSE("GPL v2");
371

source code of linux/drivers/regulator/mp886x.c