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
rt4831_get_error_flags(struct regulator_dev * rdev,unsigned int * flags)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
rt4831_regulator_probe(struct platform_device * pdev)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_DESCRIPTION("Richtek RT4831 DSV Regulators driver");
206 MODULE_LICENSE("GPL v2");
207