1a747070eSChiYuan Huang // SPDX-License-Identifier: GPL-2.0+
2a747070eSChiYuan Huang
3a747070eSChiYuan Huang #include <linux/bitops.h>
4a747070eSChiYuan Huang #include <linux/delay.h>
5a747070eSChiYuan Huang #include <linux/gpio/consumer.h>
6a747070eSChiYuan Huang #include <linux/i2c.h>
7a747070eSChiYuan Huang #include <linux/kernel.h>
8a747070eSChiYuan Huang #include <linux/module.h>
9a747070eSChiYuan Huang #include <linux/regmap.h>
10a747070eSChiYuan Huang #include <linux/regulator/driver.h>
11a747070eSChiYuan Huang #include <linux/regulator/of_regulator.h>
12a747070eSChiYuan Huang
13a747070eSChiYuan Huang #define RT6245_VIRT_OCLIMIT 0x00
14a747070eSChiYuan Huang #define RT6245_VIRT_OTLEVEL 0x01
15a747070eSChiYuan Huang #define RT6245_VIRT_PGDLYTIME 0x02
16a747070eSChiYuan Huang #define RT6245_VIRT_SLEWRATE 0x03
17a747070eSChiYuan Huang #define RT6245_VIRT_SWFREQ 0x04
18a747070eSChiYuan Huang #define RT6245_VIRT_VOUT 0x05
19a747070eSChiYuan Huang
20a747070eSChiYuan Huang #define RT6245_VOUT_MASK GENMASK(6, 0)
21a747070eSChiYuan Huang #define RT6245_SLEW_MASK GENMASK(2, 0)
22a747070eSChiYuan Huang #define RT6245_CHKSUM_MASK BIT(7)
23a747070eSChiYuan Huang #define RT6245_CODE_MASK GENMASK(6, 0)
24a747070eSChiYuan Huang
25a747070eSChiYuan Huang /* HW Enable + Soft start time */
26a747070eSChiYuan Huang #define RT6245_ENTIME_IN_US 5000
27a747070eSChiYuan Huang
28a747070eSChiYuan Huang #define RT6245_VOUT_MINUV 437500
29a747070eSChiYuan Huang #define RT6245_VOUT_MAXUV 1387500
30a747070eSChiYuan Huang #define RT6245_VOUT_STEPUV 12500
31a747070eSChiYuan Huang #define RT6245_NUM_VOUT ((RT6245_VOUT_MAXUV - RT6245_VOUT_MINUV) / RT6245_VOUT_STEPUV + 1)
32a747070eSChiYuan Huang
33a747070eSChiYuan Huang struct rt6245_priv {
34a747070eSChiYuan Huang struct gpio_desc *enable_gpio;
35a747070eSChiYuan Huang bool enable_state;
36a747070eSChiYuan Huang };
37a747070eSChiYuan Huang
rt6245_enable(struct regulator_dev * rdev)38a747070eSChiYuan Huang static int rt6245_enable(struct regulator_dev *rdev)
39a747070eSChiYuan Huang {
40a747070eSChiYuan Huang struct rt6245_priv *priv = rdev_get_drvdata(rdev);
41a747070eSChiYuan Huang struct regmap *regmap = rdev_get_regmap(rdev);
42a747070eSChiYuan Huang int ret;
43a747070eSChiYuan Huang
44a747070eSChiYuan Huang if (!priv->enable_gpio)
45a747070eSChiYuan Huang return 0;
46a747070eSChiYuan Huang
47a747070eSChiYuan Huang gpiod_direction_output(priv->enable_gpio, 1);
48a747070eSChiYuan Huang usleep_range(RT6245_ENTIME_IN_US, RT6245_ENTIME_IN_US + 1000);
49a747070eSChiYuan Huang
50a747070eSChiYuan Huang regcache_cache_only(regmap, false);
51a747070eSChiYuan Huang ret = regcache_sync(regmap);
52a747070eSChiYuan Huang if (ret)
53a747070eSChiYuan Huang return ret;
54a747070eSChiYuan Huang
55a747070eSChiYuan Huang priv->enable_state = true;
56a747070eSChiYuan Huang return 0;
57a747070eSChiYuan Huang }
58a747070eSChiYuan Huang
rt6245_disable(struct regulator_dev * rdev)59a747070eSChiYuan Huang static int rt6245_disable(struct regulator_dev *rdev)
60a747070eSChiYuan Huang {
61a747070eSChiYuan Huang struct rt6245_priv *priv = rdev_get_drvdata(rdev);
62a747070eSChiYuan Huang struct regmap *regmap = rdev_get_regmap(rdev);
63a747070eSChiYuan Huang
64a747070eSChiYuan Huang if (!priv->enable_gpio)
65a747070eSChiYuan Huang return -EINVAL;
66a747070eSChiYuan Huang
67a747070eSChiYuan Huang regcache_cache_only(regmap, true);
68a747070eSChiYuan Huang regcache_mark_dirty(regmap);
69a747070eSChiYuan Huang
70a747070eSChiYuan Huang gpiod_direction_output(priv->enable_gpio, 0);
71a747070eSChiYuan Huang
72a747070eSChiYuan Huang priv->enable_state = false;
73a747070eSChiYuan Huang return 0;
74a747070eSChiYuan Huang }
75a747070eSChiYuan Huang
rt6245_is_enabled(struct regulator_dev * rdev)76a747070eSChiYuan Huang static int rt6245_is_enabled(struct regulator_dev *rdev)
77a747070eSChiYuan Huang {
78a747070eSChiYuan Huang struct rt6245_priv *priv = rdev_get_drvdata(rdev);
79a747070eSChiYuan Huang
80a747070eSChiYuan Huang return priv->enable_state ? 1 : 0;
81a747070eSChiYuan Huang }
82a747070eSChiYuan Huang
83a747070eSChiYuan Huang static const struct regulator_ops rt6245_regulator_ops = {
84a747070eSChiYuan Huang .list_voltage = regulator_list_voltage_linear,
85a747070eSChiYuan Huang .set_voltage_sel = regulator_set_voltage_sel_regmap,
86a747070eSChiYuan Huang .get_voltage_sel = regulator_get_voltage_sel_regmap,
87a747070eSChiYuan Huang .set_ramp_delay = regulator_set_ramp_delay_regmap,
88a747070eSChiYuan Huang .enable = rt6245_enable,
89a747070eSChiYuan Huang .disable = rt6245_disable,
90a747070eSChiYuan Huang .is_enabled = rt6245_is_enabled,
91a747070eSChiYuan Huang };
92a747070eSChiYuan Huang
93a747070eSChiYuan Huang /* ramp delay dividend is 12500 uV/uS, and divisor from 1 to 8 */
94a747070eSChiYuan Huang static const unsigned int rt6245_ramp_delay_table[] = {
95a747070eSChiYuan Huang 12500, 6250, 4167, 3125, 2500, 2083, 1786, 1562
96a747070eSChiYuan Huang };
97a747070eSChiYuan Huang
98a747070eSChiYuan Huang static const struct regulator_desc rt6245_regulator_desc = {
99a747070eSChiYuan Huang .name = "rt6245-regulator",
100a747070eSChiYuan Huang .ops = &rt6245_regulator_ops,
101a747070eSChiYuan Huang .type = REGULATOR_VOLTAGE,
102a747070eSChiYuan Huang .min_uV = RT6245_VOUT_MINUV,
103a747070eSChiYuan Huang .uV_step = RT6245_VOUT_STEPUV,
104a747070eSChiYuan Huang .n_voltages = RT6245_NUM_VOUT,
105a747070eSChiYuan Huang .ramp_delay_table = rt6245_ramp_delay_table,
106a747070eSChiYuan Huang .n_ramp_values = ARRAY_SIZE(rt6245_ramp_delay_table),
107a747070eSChiYuan Huang .owner = THIS_MODULE,
108a747070eSChiYuan Huang .vsel_reg = RT6245_VIRT_VOUT,
109a747070eSChiYuan Huang .vsel_mask = RT6245_VOUT_MASK,
110a747070eSChiYuan Huang .ramp_reg = RT6245_VIRT_SLEWRATE,
111a747070eSChiYuan Huang .ramp_mask = RT6245_SLEW_MASK,
112a747070eSChiYuan Huang };
113a747070eSChiYuan Huang
rt6245_init_device_properties(struct device * dev)114a747070eSChiYuan Huang static int rt6245_init_device_properties(struct device *dev)
115a747070eSChiYuan Huang {
116a747070eSChiYuan Huang const struct {
117a747070eSChiYuan Huang const char *name;
118a747070eSChiYuan Huang unsigned int reg;
119a747070eSChiYuan Huang } rt6245_props[] = {
120a747070eSChiYuan Huang { "richtek,oc-level-select", RT6245_VIRT_OCLIMIT },
121a747070eSChiYuan Huang { "richtek,ot-level-select", RT6245_VIRT_OTLEVEL },
122a747070eSChiYuan Huang { "richtek,pgdly-time-select", RT6245_VIRT_PGDLYTIME },
123a747070eSChiYuan Huang { "richtek,switch-freq-select", RT6245_VIRT_SWFREQ }
124a747070eSChiYuan Huang };
125a747070eSChiYuan Huang struct regmap *regmap = dev_get_regmap(dev, NULL);
126a747070eSChiYuan Huang u8 propval;
127a747070eSChiYuan Huang int i, ret;
128a747070eSChiYuan Huang
129a747070eSChiYuan Huang for (i = 0; i < ARRAY_SIZE(rt6245_props); i++) {
130a747070eSChiYuan Huang ret = device_property_read_u8(dev, rt6245_props[i].name, &propval);
131a747070eSChiYuan Huang if (ret)
132a747070eSChiYuan Huang continue;
133a747070eSChiYuan Huang
134a747070eSChiYuan Huang ret = regmap_write(regmap, rt6245_props[i].reg, propval);
135a747070eSChiYuan Huang if (ret) {
136a747070eSChiYuan Huang dev_err(dev, "Fail to apply [%s:%d]\n", rt6245_props[i].name, propval);
137a747070eSChiYuan Huang return ret;
138a747070eSChiYuan Huang }
139a747070eSChiYuan Huang }
140a747070eSChiYuan Huang
141a747070eSChiYuan Huang return 0;
142a747070eSChiYuan Huang }
143a747070eSChiYuan Huang
rt6245_reg_write(void * context,unsigned int reg,unsigned int val)144a747070eSChiYuan Huang static int rt6245_reg_write(void *context, unsigned int reg, unsigned int val)
145a747070eSChiYuan Huang {
146a747070eSChiYuan Huang struct i2c_client *i2c = context;
147508f8ccdSColin Ian King static const u8 func_base[] = { 0x6F, 0x73, 0x78, 0x61, 0x7C, 0 };
148a747070eSChiYuan Huang unsigned int code, bit_count;
149a747070eSChiYuan Huang
150a747070eSChiYuan Huang code = func_base[reg];
151a747070eSChiYuan Huang code += val;
152a747070eSChiYuan Huang
153a747070eSChiYuan Huang /* xor checksum for bit 6 to 0 */
154a747070eSChiYuan Huang bit_count = hweight8(code & RT6245_CODE_MASK);
155a747070eSChiYuan Huang if (bit_count % 2)
156a747070eSChiYuan Huang code |= RT6245_CHKSUM_MASK;
157a747070eSChiYuan Huang else
158a747070eSChiYuan Huang code &= ~RT6245_CHKSUM_MASK;
159a747070eSChiYuan Huang
160a747070eSChiYuan Huang return i2c_smbus_write_byte(i2c, code);
161a747070eSChiYuan Huang }
162a747070eSChiYuan Huang
163a747070eSChiYuan Huang static const struct reg_default rt6245_reg_defaults[] = {
164a747070eSChiYuan Huang /* Default over current 14A */
165a747070eSChiYuan Huang { RT6245_VIRT_OCLIMIT, 2 },
166a747070eSChiYuan Huang /* Default over temperature 150'c */
167a747070eSChiYuan Huang { RT6245_VIRT_OTLEVEL, 0 },
168a747070eSChiYuan Huang /* Default power good delay time 10us */
169a747070eSChiYuan Huang { RT6245_VIRT_PGDLYTIME, 1 },
170a747070eSChiYuan Huang /* Default slewrate 12.5mV/uS */
171a747070eSChiYuan Huang { RT6245_VIRT_SLEWRATE, 0 },
172a747070eSChiYuan Huang /* Default switch frequency 800KHz */
173a747070eSChiYuan Huang { RT6245_VIRT_SWFREQ, 1 },
174a747070eSChiYuan Huang /* Default voltage 750mV */
175a747070eSChiYuan Huang { RT6245_VIRT_VOUT, 0x19 }
176a747070eSChiYuan Huang };
177a747070eSChiYuan Huang
178a747070eSChiYuan Huang static const struct regmap_config rt6245_regmap_config = {
179a747070eSChiYuan Huang .reg_bits = 8,
180a747070eSChiYuan Huang .val_bits = 8,
181a747070eSChiYuan Huang .max_register = RT6245_VIRT_VOUT,
182a747070eSChiYuan Huang .cache_type = REGCACHE_FLAT,
183a747070eSChiYuan Huang .reg_defaults = rt6245_reg_defaults,
184a747070eSChiYuan Huang .num_reg_defaults = ARRAY_SIZE(rt6245_reg_defaults),
185a747070eSChiYuan Huang .reg_write = rt6245_reg_write,
186a747070eSChiYuan Huang };
187a747070eSChiYuan Huang
rt6245_probe(struct i2c_client * i2c)188a747070eSChiYuan Huang static int rt6245_probe(struct i2c_client *i2c)
189a747070eSChiYuan Huang {
190a747070eSChiYuan Huang struct rt6245_priv *priv;
191a747070eSChiYuan Huang struct regmap *regmap;
192a747070eSChiYuan Huang struct regulator_config regulator_cfg = {};
193a747070eSChiYuan Huang struct regulator_dev *rdev;
194a747070eSChiYuan Huang int ret;
195a747070eSChiYuan Huang
196a747070eSChiYuan Huang priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL);
197a747070eSChiYuan Huang if (!priv)
198a747070eSChiYuan Huang return -ENOMEM;
199a747070eSChiYuan Huang
200a747070eSChiYuan Huang priv->enable_state = true;
201a747070eSChiYuan Huang
202a747070eSChiYuan Huang priv->enable_gpio = devm_gpiod_get_optional(&i2c->dev, "enable", GPIOD_OUT_HIGH);
203a747070eSChiYuan Huang if (IS_ERR(priv->enable_gpio)) {
204a747070eSChiYuan Huang dev_err(&i2c->dev, "Failed to get 'enable' gpio\n");
205a747070eSChiYuan Huang return PTR_ERR(priv->enable_gpio);
206a747070eSChiYuan Huang }
207a747070eSChiYuan Huang
208a747070eSChiYuan Huang usleep_range(RT6245_ENTIME_IN_US, RT6245_ENTIME_IN_US + 1000);
209a747070eSChiYuan Huang
210a747070eSChiYuan Huang regmap = devm_regmap_init(&i2c->dev, NULL, i2c, &rt6245_regmap_config);
211a747070eSChiYuan Huang if (IS_ERR(regmap)) {
212a747070eSChiYuan Huang dev_err(&i2c->dev, "Failed to initialize the regmap\n");
213a747070eSChiYuan Huang return PTR_ERR(regmap);
214a747070eSChiYuan Huang }
215a747070eSChiYuan Huang
216a747070eSChiYuan Huang ret = rt6245_init_device_properties(&i2c->dev);
217a747070eSChiYuan Huang if (ret) {
218a747070eSChiYuan Huang dev_err(&i2c->dev, "Failed to initialize device properties\n");
219a747070eSChiYuan Huang return ret;
220a747070eSChiYuan Huang }
221a747070eSChiYuan Huang
222a747070eSChiYuan Huang regulator_cfg.dev = &i2c->dev;
223a747070eSChiYuan Huang regulator_cfg.of_node = i2c->dev.of_node;
224a747070eSChiYuan Huang regulator_cfg.regmap = regmap;
225a747070eSChiYuan Huang regulator_cfg.driver_data = priv;
226a747070eSChiYuan Huang regulator_cfg.init_data = of_get_regulator_init_data(&i2c->dev, i2c->dev.of_node,
227a747070eSChiYuan Huang &rt6245_regulator_desc);
228a747070eSChiYuan Huang rdev = devm_regulator_register(&i2c->dev, &rt6245_regulator_desc, ®ulator_cfg);
229a747070eSChiYuan Huang if (IS_ERR(rdev)) {
230a747070eSChiYuan Huang dev_err(&i2c->dev, "Failed to register regulator\n");
231a747070eSChiYuan Huang return PTR_ERR(rdev);
232a747070eSChiYuan Huang }
233a747070eSChiYuan Huang
234a747070eSChiYuan Huang return 0;
235a747070eSChiYuan Huang }
236a747070eSChiYuan Huang
237a747070eSChiYuan Huang static const struct of_device_id __maybe_unused rt6245_of_match_table[] = {
238a747070eSChiYuan Huang { .compatible = "richtek,rt6245", },
239a747070eSChiYuan Huang {}
240a747070eSChiYuan Huang };
241a747070eSChiYuan Huang MODULE_DEVICE_TABLE(of, rt6245_of_match_table);
242a747070eSChiYuan Huang
243a747070eSChiYuan Huang static struct i2c_driver rt6245_driver = {
244a747070eSChiYuan Huang .driver = {
245a747070eSChiYuan Huang .name = "rt6245",
24646600ab1SDouglas Anderson .probe_type = PROBE_PREFER_ASYNCHRONOUS,
247a747070eSChiYuan Huang .of_match_table = rt6245_of_match_table,
248a747070eSChiYuan Huang },
249*964e1865SUwe Kleine-König .probe = rt6245_probe,
250a747070eSChiYuan Huang };
251a747070eSChiYuan Huang module_i2c_driver(rt6245_driver);
252a747070eSChiYuan Huang
253a747070eSChiYuan Huang MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
254a747070eSChiYuan Huang MODULE_DESCRIPTION("Richtek RT6245 Regulator Driver");
255a747070eSChiYuan Huang MODULE_LICENSE("GPL v2");
256