1 // SPDX-License-Identifier: GPL-2.0-only
2 
3 #include <linux/bitops.h>
4 #include <linux/kernel.h>
5 #include <linux/module.h>
6 #include <linux/of.h>
7 #include <linux/platform_device.h>
8 #include <linux/regmap.h>
9 #include <linux/regulator/consumer.h>
10 #include <linux/regulator/driver.h>
11 
12 enum {
13 	DSV_OUT_VLCM = 0,
14 	DSV_OUT_VPOS,
15 	DSV_OUT_VNEG,
16 	DSV_OUT_MAX
17 };
18 
19 #define RT4831_REG_DSVEN	0x09
20 #define RT4831_REG_VLCM		0x0c
21 #define RT4831_REG_VPOS		0x0d
22 #define RT4831_REG_VNEG		0x0e
23 #define RT4831_REG_FLAGS	0x0f
24 
25 #define RT4831_VOLT_MASK	GENMASK(5, 0)
26 #define RT4831_DSVMODE_SHIFT	5
27 #define RT4831_DSVMODE_MASK	GENMASK(7, 5)
28 #define RT4831_POSADEN_MASK	BIT(4)
29 #define RT4831_NEGADEN_MASK	BIT(3)
30 #define RT4831_POSEN_MASK	BIT(2)
31 #define RT4831_NEGEN_MASK	BIT(1)
32 
33 #define RT4831_OTP_MASK		BIT(6)
34 #define RT4831_LCMOVP_MASK	BIT(5)
35 #define RT4831_VPOSSCP_MASK	BIT(3)
36 #define RT4831_VNEGSCP_MASK	BIT(2)
37 
38 #define DSV_MODE_NORMAL		(0x4 << RT4831_DSVMODE_SHIFT)
39 #define DSV_MODE_BYPASS		(0x6 << RT4831_DSVMODE_SHIFT)
40 #define STEP_UV			50000
41 #define VLCM_MIN_UV		4000000
42 #define VLCM_MAX_UV		7150000
43 #define VLCM_N_VOLTAGES		((VLCM_MAX_UV - VLCM_MIN_UV) / STEP_UV + 1)
44 #define VPN_MIN_UV		4000000
45 #define VPN_MAX_UV		6500000
46 #define VPN_N_VOLTAGES		((VPN_MAX_UV - VPN_MIN_UV) / STEP_UV + 1)
47 
48 static int rt4831_get_error_flags(struct regulator_dev *rdev, unsigned int *flags)
49 {
50 	struct regmap *regmap = rdev_get_regmap(rdev);
51 	int rid = rdev_get_id(rdev);
52 	unsigned int val, events = 0;
53 	int ret;
54 
55 	ret = regmap_read(regmap, RT4831_REG_FLAGS, &val);
56 	if (ret)
57 		return ret;
58 
59 	if (val & RT4831_OTP_MASK)
60 		events |= REGULATOR_ERROR_OVER_TEMP;
61 
62 	if (rid == DSV_OUT_VLCM && (val & RT4831_LCMOVP_MASK))
63 		events |= REGULATOR_ERROR_OVER_CURRENT;
64 
65 	if (rid == DSV_OUT_VPOS && (val & RT4831_VPOSSCP_MASK))
66 		events |= REGULATOR_ERROR_OVER_CURRENT;
67 
68 	if (rid == DSV_OUT_VNEG && (val & RT4831_VNEGSCP_MASK))
69 		events |= REGULATOR_ERROR_OVER_CURRENT;
70 
71 	*flags = events;
72 	return 0;
73 }
74 
75 static const struct regulator_ops rt4831_dsvlcm_ops = {
76 	.list_voltage = regulator_list_voltage_linear,
77 	.set_voltage_sel = regulator_set_voltage_sel_regmap,
78 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
79 	.set_bypass = regulator_set_bypass_regmap,
80 	.get_bypass = regulator_get_bypass_regmap,
81 	.get_error_flags = rt4831_get_error_flags,
82 };
83 
84 static const struct regulator_ops rt4831_dsvpn_ops = {
85 	.list_voltage = regulator_list_voltage_linear,
86 	.set_voltage_sel = regulator_set_voltage_sel_regmap,
87 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
88 	.enable = regulator_enable_regmap,
89 	.disable = regulator_disable_regmap,
90 	.is_enabled = regulator_is_enabled_regmap,
91 	.set_active_discharge = regulator_set_active_discharge_regmap,
92 	.get_error_flags = rt4831_get_error_flags,
93 };
94 
95 static const struct regulator_desc rt4831_regulator_descs[] = {
96 	{
97 		.name = "DSVLCM",
98 		.ops = &rt4831_dsvlcm_ops,
99 		.of_match = of_match_ptr("DSVLCM"),
100 		.regulators_node = of_match_ptr("regulators"),
101 		.type = REGULATOR_VOLTAGE,
102 		.id = DSV_OUT_VLCM,
103 		.n_voltages = VLCM_N_VOLTAGES,
104 		.min_uV = VLCM_MIN_UV,
105 		.uV_step = STEP_UV,
106 		.vsel_reg = RT4831_REG_VLCM,
107 		.vsel_mask = RT4831_VOLT_MASK,
108 		.bypass_reg = RT4831_REG_DSVEN,
109 		.bypass_mask = RT4831_DSVMODE_MASK,
110 		.bypass_val_on = DSV_MODE_BYPASS,
111 		.bypass_val_off = DSV_MODE_NORMAL,
112 		.owner = THIS_MODULE,
113 	},
114 	{
115 		.name = "DSVP",
116 		.ops = &rt4831_dsvpn_ops,
117 		.of_match = of_match_ptr("DSVP"),
118 		.regulators_node = of_match_ptr("regulators"),
119 		.type = REGULATOR_VOLTAGE,
120 		.id = DSV_OUT_VPOS,
121 		.n_voltages = VPN_N_VOLTAGES,
122 		.min_uV = VPN_MIN_UV,
123 		.uV_step = STEP_UV,
124 		.vsel_reg = RT4831_REG_VPOS,
125 		.vsel_mask = RT4831_VOLT_MASK,
126 		.enable_reg = RT4831_REG_DSVEN,
127 		.enable_mask = RT4831_POSEN_MASK,
128 		.active_discharge_reg = RT4831_REG_DSVEN,
129 		.active_discharge_mask = RT4831_POSADEN_MASK,
130 		.active_discharge_on = RT4831_POSADEN_MASK,
131 		.owner = THIS_MODULE,
132 	},
133 	{
134 		.name = "DSVN",
135 		.ops = &rt4831_dsvpn_ops,
136 		.of_match = of_match_ptr("DSVN"),
137 		.regulators_node = of_match_ptr("regulators"),
138 		.type = REGULATOR_VOLTAGE,
139 		.id = DSV_OUT_VNEG,
140 		.n_voltages = VPN_N_VOLTAGES,
141 		.min_uV = VPN_MIN_UV,
142 		.uV_step = STEP_UV,
143 		.vsel_reg = RT4831_REG_VNEG,
144 		.vsel_mask = RT4831_VOLT_MASK,
145 		.enable_reg = RT4831_REG_DSVEN,
146 		.enable_mask = RT4831_NEGEN_MASK,
147 		.active_discharge_reg = RT4831_REG_DSVEN,
148 		.active_discharge_mask = RT4831_NEGADEN_MASK,
149 		.active_discharge_on = RT4831_NEGADEN_MASK,
150 		.owner = THIS_MODULE,
151 	}
152 };
153 
154 static int rt4831_regulator_probe(struct platform_device *pdev)
155 {
156 	struct regmap *regmap;
157 	struct regulator_dev *rdev;
158 	struct regulator_config config = {};
159 	int i, ret;
160 
161 	regmap = dev_get_regmap(pdev->dev.parent, NULL);
162 	if (!regmap) {
163 		dev_err(&pdev->dev, "Failed to init regmap\n");
164 		return -ENODEV;
165 	}
166 
167 	/* Configure DSV mode to normal by default */
168 	ret = regmap_update_bits(regmap, RT4831_REG_DSVEN, RT4831_DSVMODE_MASK, DSV_MODE_NORMAL);
169 	if (ret) {
170 		dev_err(&pdev->dev, "Failed to configure dsv mode to normal\n");
171 		return ret;
172 	}
173 
174 	config.dev = pdev->dev.parent;
175 	config.regmap = regmap;
176 
177 	for (i = 0; i < DSV_OUT_MAX; i++) {
178 		rdev = devm_regulator_register(&pdev->dev, rt4831_regulator_descs + i, &config);
179 		if (IS_ERR(rdev)) {
180 			dev_err(&pdev->dev, "Failed to register %d regulator\n", i);
181 			return PTR_ERR(rdev);
182 		}
183 	}
184 
185 	return 0;
186 }
187 
188 static const struct platform_device_id rt4831_regulator_match[] = {
189 	{ "rt4831-regulator", 0 },
190 	{}
191 };
192 MODULE_DEVICE_TABLE(platform, rt4831_regulator_match);
193 
194 static struct platform_driver rt4831_regulator_driver = {
195 	.driver = {
196 		.name = "rt4831-regulator",
197 		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
198 	},
199 	.id_table = rt4831_regulator_match,
200 	.probe = rt4831_regulator_probe,
201 };
202 module_platform_driver(rt4831_regulator_driver);
203 
204 MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
205 MODULE_LICENSE("GPL v2");
206