1*6928a3c0SChiYuan Huang // SPDX-License-Identifier: GPL-2.0-only
2*6928a3c0SChiYuan Huang /*
3*6928a3c0SChiYuan Huang * Copyright (C) 2023 Richtek Technology Corp.
4*6928a3c0SChiYuan Huang *
5*6928a3c0SChiYuan Huang * Author: ChiYuan Huang <cy_huang@richtek.com>
6*6928a3c0SChiYuan Huang */
7*6928a3c0SChiYuan Huang
8*6928a3c0SChiYuan Huang #include <linux/i2c.h>
9*6928a3c0SChiYuan Huang #include <linux/kernel.h>
10*6928a3c0SChiYuan Huang #include <linux/mod_devicetable.h>
11*6928a3c0SChiYuan Huang #include <linux/module.h>
12*6928a3c0SChiYuan Huang #include <linux/property.h>
13*6928a3c0SChiYuan Huang #include <linux/regmap.h>
14*6928a3c0SChiYuan Huang #include <linux/regulator/driver.h>
15*6928a3c0SChiYuan Huang #include <linux/regulator/of_regulator.h>
16*6928a3c0SChiYuan Huang
17*6928a3c0SChiYuan Huang #define RT4803_AUTO_MODE 1
18*6928a3c0SChiYuan Huang #define RT4803_FPWM_MODE 2
19*6928a3c0SChiYuan Huang
20*6928a3c0SChiYuan Huang #define RT4803_REG_CONFIG 0x01
21*6928a3c0SChiYuan Huang #define RT4803_REG_VSELL 0x02
22*6928a3c0SChiYuan Huang #define RT4803_REG_VSELH 0x03
23*6928a3c0SChiYuan Huang #define RT4803_REG_ILIM 0x04
24*6928a3c0SChiYuan Huang #define RT4803_REG_STAT 0x05
25*6928a3c0SChiYuan Huang
26*6928a3c0SChiYuan Huang #define RT4803_MODE_MASK GENMASK(1, 0)
27*6928a3c0SChiYuan Huang #define RT4803_VSEL_MASK GENMASK(4, 0)
28*6928a3c0SChiYuan Huang #define RT4803_ILIM_MASK GENMASK(3, 0)
29*6928a3c0SChiYuan Huang #define RT4803_TSD_MASK BIT(7)
30*6928a3c0SChiYuan Huang #define RT4803_HOTDIE_MASK BIT(6)
31*6928a3c0SChiYuan Huang #define RT4803_FAULT_MASK BIT(1)
32*6928a3c0SChiYuan Huang #define RT4803_PGOOD_MASK BIT(0)
33*6928a3c0SChiYuan Huang
34*6928a3c0SChiYuan Huang #define RT4803_VOUT_MINUV 2850000
35*6928a3c0SChiYuan Huang #define RT4803_VOUT_STEPUV 50000
36*6928a3c0SChiYuan Huang #define RT4803_VOUT_NUM 32
37*6928a3c0SChiYuan Huang
rt4803_set_mode(struct regulator_dev * rdev,unsigned int mode)38*6928a3c0SChiYuan Huang static int rt4803_set_mode(struct regulator_dev *rdev, unsigned int mode)
39*6928a3c0SChiYuan Huang {
40*6928a3c0SChiYuan Huang struct regmap *regmap = rdev_get_regmap(rdev);
41*6928a3c0SChiYuan Huang unsigned int modeval;
42*6928a3c0SChiYuan Huang
43*6928a3c0SChiYuan Huang switch (mode) {
44*6928a3c0SChiYuan Huang case REGULATOR_MODE_NORMAL:
45*6928a3c0SChiYuan Huang modeval = RT4803_AUTO_MODE;
46*6928a3c0SChiYuan Huang break;
47*6928a3c0SChiYuan Huang case REGULATOR_MODE_FAST:
48*6928a3c0SChiYuan Huang modeval = RT4803_FPWM_MODE;
49*6928a3c0SChiYuan Huang break;
50*6928a3c0SChiYuan Huang default:
51*6928a3c0SChiYuan Huang return -EINVAL;
52*6928a3c0SChiYuan Huang }
53*6928a3c0SChiYuan Huang
54*6928a3c0SChiYuan Huang modeval <<= ffs(RT4803_MODE_MASK) - 1;
55*6928a3c0SChiYuan Huang
56*6928a3c0SChiYuan Huang return regmap_update_bits(regmap, RT4803_REG_CONFIG, RT4803_MODE_MASK, modeval);
57*6928a3c0SChiYuan Huang }
58*6928a3c0SChiYuan Huang
rt4803_get_mode(struct regulator_dev * rdev)59*6928a3c0SChiYuan Huang static unsigned int rt4803_get_mode(struct regulator_dev *rdev)
60*6928a3c0SChiYuan Huang {
61*6928a3c0SChiYuan Huang struct regmap *regmap = rdev_get_regmap(rdev);
62*6928a3c0SChiYuan Huang unsigned int modeval;
63*6928a3c0SChiYuan Huang int ret;
64*6928a3c0SChiYuan Huang
65*6928a3c0SChiYuan Huang ret = regmap_read(regmap, RT4803_REG_CONFIG, &modeval);
66*6928a3c0SChiYuan Huang if (ret)
67*6928a3c0SChiYuan Huang return REGULATOR_MODE_INVALID;
68*6928a3c0SChiYuan Huang
69*6928a3c0SChiYuan Huang modeval >>= ffs(RT4803_MODE_MASK) - 1;
70*6928a3c0SChiYuan Huang
71*6928a3c0SChiYuan Huang switch (modeval) {
72*6928a3c0SChiYuan Huang case RT4803_AUTO_MODE:
73*6928a3c0SChiYuan Huang return REGULATOR_MODE_NORMAL;
74*6928a3c0SChiYuan Huang case RT4803_FPWM_MODE:
75*6928a3c0SChiYuan Huang return REGULATOR_MODE_FAST;
76*6928a3c0SChiYuan Huang default:
77*6928a3c0SChiYuan Huang return REGULATOR_MODE_INVALID;
78*6928a3c0SChiYuan Huang }
79*6928a3c0SChiYuan Huang }
80*6928a3c0SChiYuan Huang
rt4803_get_error_flags(struct regulator_dev * rdev,unsigned int * flags)81*6928a3c0SChiYuan Huang static int rt4803_get_error_flags(struct regulator_dev *rdev, unsigned int *flags)
82*6928a3c0SChiYuan Huang {
83*6928a3c0SChiYuan Huang struct regmap *regmap = rdev_get_regmap(rdev);
84*6928a3c0SChiYuan Huang unsigned int state, events = 0;
85*6928a3c0SChiYuan Huang int ret;
86*6928a3c0SChiYuan Huang
87*6928a3c0SChiYuan Huang ret = regmap_read(regmap, RT4803_REG_STAT, &state);
88*6928a3c0SChiYuan Huang if (ret)
89*6928a3c0SChiYuan Huang return ret;
90*6928a3c0SChiYuan Huang
91*6928a3c0SChiYuan Huang if (state & RT4803_PGOOD_MASK)
92*6928a3c0SChiYuan Huang goto out_error_flag;
93*6928a3c0SChiYuan Huang
94*6928a3c0SChiYuan Huang if (state & RT4803_FAULT_MASK)
95*6928a3c0SChiYuan Huang events |= REGULATOR_ERROR_FAIL;
96*6928a3c0SChiYuan Huang
97*6928a3c0SChiYuan Huang if (state & RT4803_HOTDIE_MASK)
98*6928a3c0SChiYuan Huang events |= REGULATOR_ERROR_OVER_TEMP_WARN;
99*6928a3c0SChiYuan Huang
100*6928a3c0SChiYuan Huang if (state & RT4803_TSD_MASK)
101*6928a3c0SChiYuan Huang events |= REGULATOR_ERROR_OVER_TEMP;
102*6928a3c0SChiYuan Huang
103*6928a3c0SChiYuan Huang out_error_flag:
104*6928a3c0SChiYuan Huang *flags = events;
105*6928a3c0SChiYuan Huang return 0;
106*6928a3c0SChiYuan Huang }
107*6928a3c0SChiYuan Huang
rt4803_set_suspend_voltage(struct regulator_dev * rdev,int uV)108*6928a3c0SChiYuan Huang static int rt4803_set_suspend_voltage(struct regulator_dev *rdev, int uV)
109*6928a3c0SChiYuan Huang {
110*6928a3c0SChiYuan Huang struct regmap *regmap = rdev_get_regmap(rdev);
111*6928a3c0SChiYuan Huang unsigned int reg, vsel;
112*6928a3c0SChiYuan Huang
113*6928a3c0SChiYuan Huang if (rdev->desc->vsel_reg == RT4803_REG_VSELL)
114*6928a3c0SChiYuan Huang reg = RT4803_REG_VSELH;
115*6928a3c0SChiYuan Huang else
116*6928a3c0SChiYuan Huang reg = RT4803_REG_VSELL;
117*6928a3c0SChiYuan Huang
118*6928a3c0SChiYuan Huang vsel = (uV - rdev->desc->min_uV) / rdev->desc->uV_step;
119*6928a3c0SChiYuan Huang vsel <<= ffs(RT4803_VSEL_MASK) - 1;
120*6928a3c0SChiYuan Huang
121*6928a3c0SChiYuan Huang return regmap_update_bits(regmap, reg, RT4803_VSEL_MASK, vsel);
122*6928a3c0SChiYuan Huang }
123*6928a3c0SChiYuan Huang
124*6928a3c0SChiYuan Huang static const struct regulator_ops rt4803_regulator_ops = {
125*6928a3c0SChiYuan Huang .list_voltage = regulator_list_voltage_linear,
126*6928a3c0SChiYuan Huang .set_voltage_sel = regulator_set_voltage_sel_regmap,
127*6928a3c0SChiYuan Huang .get_voltage_sel = regulator_get_voltage_sel_regmap,
128*6928a3c0SChiYuan Huang .set_mode = rt4803_set_mode,
129*6928a3c0SChiYuan Huang .get_mode = rt4803_get_mode,
130*6928a3c0SChiYuan Huang .get_error_flags = rt4803_get_error_flags,
131*6928a3c0SChiYuan Huang .set_suspend_voltage = rt4803_set_suspend_voltage,
132*6928a3c0SChiYuan Huang };
133*6928a3c0SChiYuan Huang
rt4803_of_map_mode(unsigned int mode)134*6928a3c0SChiYuan Huang static unsigned int rt4803_of_map_mode(unsigned int mode)
135*6928a3c0SChiYuan Huang {
136*6928a3c0SChiYuan Huang switch (mode) {
137*6928a3c0SChiYuan Huang case RT4803_AUTO_MODE:
138*6928a3c0SChiYuan Huang return REGULATOR_MODE_NORMAL;
139*6928a3c0SChiYuan Huang case RT4803_FPWM_MODE:
140*6928a3c0SChiYuan Huang return REGULATOR_MODE_FAST;
141*6928a3c0SChiYuan Huang default:
142*6928a3c0SChiYuan Huang return REGULATOR_MODE_INVALID;
143*6928a3c0SChiYuan Huang }
144*6928a3c0SChiYuan Huang }
145*6928a3c0SChiYuan Huang
146*6928a3c0SChiYuan Huang static const struct regmap_config rt4803_regmap_config = {
147*6928a3c0SChiYuan Huang .reg_bits = 8,
148*6928a3c0SChiYuan Huang .val_bits = 8,
149*6928a3c0SChiYuan Huang .max_register = RT4803_REG_STAT,
150*6928a3c0SChiYuan Huang };
151*6928a3c0SChiYuan Huang
rt4803_probe(struct i2c_client * i2c)152*6928a3c0SChiYuan Huang static int rt4803_probe(struct i2c_client *i2c)
153*6928a3c0SChiYuan Huang {
154*6928a3c0SChiYuan Huang struct device *dev = &i2c->dev;
155*6928a3c0SChiYuan Huang struct regmap *regmap;
156*6928a3c0SChiYuan Huang struct regulator_desc *desc;
157*6928a3c0SChiYuan Huang struct regulator_config cfg = {};
158*6928a3c0SChiYuan Huang struct regulator_dev *rdev;
159*6928a3c0SChiYuan Huang bool vsel_act_high;
160*6928a3c0SChiYuan Huang int ret;
161*6928a3c0SChiYuan Huang
162*6928a3c0SChiYuan Huang desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
163*6928a3c0SChiYuan Huang if (!desc)
164*6928a3c0SChiYuan Huang return -ENOMEM;
165*6928a3c0SChiYuan Huang
166*6928a3c0SChiYuan Huang regmap = devm_regmap_init_i2c(i2c, &rt4803_regmap_config);
167*6928a3c0SChiYuan Huang if (IS_ERR(regmap))
168*6928a3c0SChiYuan Huang return dev_err_probe(dev, PTR_ERR(regmap), "Failed to init regmap\n");
169*6928a3c0SChiYuan Huang
170*6928a3c0SChiYuan Huang /* Always configure the input current limit to max 5A at initial */
171*6928a3c0SChiYuan Huang ret = regmap_update_bits(regmap, RT4803_REG_ILIM, RT4803_ILIM_MASK, 0xff);
172*6928a3c0SChiYuan Huang if (ret)
173*6928a3c0SChiYuan Huang return dev_err_probe(dev, ret, "Failed to config ILIM to max\n");
174*6928a3c0SChiYuan Huang
175*6928a3c0SChiYuan Huang vsel_act_high = device_property_read_bool(dev, "richtek,vsel-active-high");
176*6928a3c0SChiYuan Huang
177*6928a3c0SChiYuan Huang desc->name = "rt4803-regulator";
178*6928a3c0SChiYuan Huang desc->type = REGULATOR_VOLTAGE;
179*6928a3c0SChiYuan Huang desc->owner = THIS_MODULE;
180*6928a3c0SChiYuan Huang desc->ops = &rt4803_regulator_ops;
181*6928a3c0SChiYuan Huang desc->min_uV = RT4803_VOUT_MINUV;
182*6928a3c0SChiYuan Huang desc->uV_step = RT4803_VOUT_STEPUV;
183*6928a3c0SChiYuan Huang desc->n_voltages = RT4803_VOUT_NUM;
184*6928a3c0SChiYuan Huang desc->vsel_mask = RT4803_VSEL_MASK;
185*6928a3c0SChiYuan Huang desc->of_map_mode = rt4803_of_map_mode;
186*6928a3c0SChiYuan Huang if (vsel_act_high)
187*6928a3c0SChiYuan Huang desc->vsel_reg = RT4803_REG_VSELH;
188*6928a3c0SChiYuan Huang else
189*6928a3c0SChiYuan Huang desc->vsel_reg = RT4803_REG_VSELL;
190*6928a3c0SChiYuan Huang
191*6928a3c0SChiYuan Huang cfg.dev = dev;
192*6928a3c0SChiYuan Huang cfg.of_node = dev_of_node(dev);
193*6928a3c0SChiYuan Huang cfg.init_data = of_get_regulator_init_data(dev, dev_of_node(dev), desc);
194*6928a3c0SChiYuan Huang
195*6928a3c0SChiYuan Huang rdev = devm_regulator_register(dev, desc, &cfg);
196*6928a3c0SChiYuan Huang return PTR_ERR_OR_ZERO(rdev);
197*6928a3c0SChiYuan Huang }
198*6928a3c0SChiYuan Huang
199*6928a3c0SChiYuan Huang static const struct of_device_id rt4803_device_match_table[] = {
200*6928a3c0SChiYuan Huang { .compatible = "richtek,rt4803" },
201*6928a3c0SChiYuan Huang {}
202*6928a3c0SChiYuan Huang };
203*6928a3c0SChiYuan Huang MODULE_DEVICE_TABLE(of, rt4803_device_match_table);
204*6928a3c0SChiYuan Huang
205*6928a3c0SChiYuan Huang static struct i2c_driver rt4803_driver = {
206*6928a3c0SChiYuan Huang .driver = {
207*6928a3c0SChiYuan Huang .name = "rt4803",
208*6928a3c0SChiYuan Huang .of_match_table = rt4803_device_match_table,
209*6928a3c0SChiYuan Huang },
210*6928a3c0SChiYuan Huang .probe = rt4803_probe,
211*6928a3c0SChiYuan Huang };
212*6928a3c0SChiYuan Huang module_i2c_driver(rt4803_driver);
213*6928a3c0SChiYuan Huang
214*6928a3c0SChiYuan Huang MODULE_DESCRIPTION("Richtek RT4803 voltage regulator driver");
215*6928a3c0SChiYuan Huang MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
216*6928a3c0SChiYuan Huang MODULE_LICENSE("GPL");
217