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77c129bf VRT |
1 | /* |
2 | * TI TPS65132 Regulator driver | |
3 | * | |
4 | * Copyright (C) 2017 NVIDIA CORPORATION. All rights reserved. | |
5 | * | |
6 | * Author: Venkat Reddy Talla <vreddytalla@nvidia.com> | |
7 | * Laxman Dewangan <ldewangan@nvidia.com> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License as | |
11 | * published by the Free Software Foundation; either version 2 of the | |
12 | * License, or (at your option) any later version. | |
13 | * | |
14 | * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind, | |
15 | * whether express or implied; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * General Public License for more details. | |
18 | */ | |
19 | ||
20 | #include <linux/delay.h> | |
21 | #include <linux/err.h> | |
22 | #include <linux/gpio/consumer.h> | |
23 | #include <linux/i2c.h> | |
24 | #include <linux/module.h> | |
25 | #include <linux/regmap.h> | |
26 | #include <linux/regulator/driver.h> | |
27 | #include <linux/regulator/machine.h> | |
28 | ||
29 | #define TPS65132_REG_VPOS 0x00 | |
30 | #define TPS65132_REG_VNEG 0x01 | |
31 | #define TPS65132_REG_APPS_DISP_DISN 0x03 | |
32 | #define TPS65132_REG_CONTROL 0x0FF | |
33 | ||
34 | #define TPS65132_VOUT_MASK 0x1F | |
35 | #define TPS65132_VOUT_N_VOLTAGE 0x15 | |
36 | #define TPS65132_VOUT_VMIN 4000000 | |
37 | #define TPS65132_VOUT_VMAX 6000000 | |
38 | #define TPS65132_VOUT_STEP 100000 | |
39 | ||
40 | #define TPS65132_REG_APPS_DIS_VPOS BIT(0) | |
41 | #define TPS65132_REG_APPS_DIS_VNEG BIT(1) | |
42 | ||
43 | #define TPS65132_REGULATOR_ID_VPOS 0 | |
44 | #define TPS65132_REGULATOR_ID_VNEG 1 | |
45 | #define TPS65132_MAX_REGULATORS 2 | |
46 | ||
47 | #define TPS65132_ACT_DIS_TIME_SLACK 1000 | |
48 | ||
49 | struct tps65132_reg_pdata { | |
50 | struct gpio_desc *en_gpiod; | |
51 | struct gpio_desc *act_dis_gpiod; | |
52 | unsigned int act_dis_time_us; | |
53 | int ena_gpio_state; | |
54 | }; | |
55 | ||
56 | struct tps65132_regulator { | |
57 | struct device *dev; | |
58 | struct regmap *rmap; | |
59 | struct regulator_desc *rdesc[TPS65132_MAX_REGULATORS]; | |
60 | struct tps65132_reg_pdata reg_pdata[TPS65132_MAX_REGULATORS]; | |
61 | struct regulator_dev *rdev[TPS65132_MAX_REGULATORS]; | |
62 | }; | |
63 | ||
64 | static int tps65132_regulator_enable(struct regulator_dev *rdev) | |
65 | { | |
66 | struct tps65132_regulator *tps = rdev_get_drvdata(rdev); | |
67 | int id = rdev_get_id(rdev); | |
68 | struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[id]; | |
69 | int ret; | |
70 | ||
71 | if (!IS_ERR(rpdata->en_gpiod)) { | |
72 | gpiod_set_value_cansleep(rpdata->en_gpiod, 1); | |
73 | rpdata->ena_gpio_state = 1; | |
74 | } | |
75 | ||
76 | /* Hardware automatically enable discharge bit in enable */ | |
77 | if (rdev->constraints->active_discharge == | |
78 | REGULATOR_ACTIVE_DISCHARGE_DISABLE) { | |
79 | ret = regulator_set_active_discharge_regmap(rdev, false); | |
80 | if (ret < 0) { | |
81 | dev_err(tps->dev, "Failed to disable active discharge: %d\n", | |
82 | ret); | |
83 | return ret; | |
84 | } | |
85 | } | |
86 | ||
87 | return 0; | |
88 | } | |
89 | ||
90 | static int tps65132_regulator_disable(struct regulator_dev *rdev) | |
91 | { | |
92 | struct tps65132_regulator *tps = rdev_get_drvdata(rdev); | |
93 | int id = rdev_get_id(rdev); | |
94 | struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[id]; | |
95 | ||
96 | if (!IS_ERR(rpdata->en_gpiod)) { | |
97 | gpiod_set_value_cansleep(rpdata->en_gpiod, 0); | |
98 | rpdata->ena_gpio_state = 0; | |
99 | } | |
100 | ||
101 | if (!IS_ERR(rpdata->act_dis_gpiod)) { | |
102 | gpiod_set_value_cansleep(rpdata->act_dis_gpiod, 1); | |
103 | usleep_range(rpdata->act_dis_time_us, rpdata->act_dis_time_us + | |
104 | TPS65132_ACT_DIS_TIME_SLACK); | |
105 | gpiod_set_value_cansleep(rpdata->act_dis_gpiod, 0); | |
106 | } | |
107 | ||
108 | return 0; | |
109 | } | |
110 | ||
111 | static int tps65132_regulator_is_enabled(struct regulator_dev *rdev) | |
112 | { | |
113 | struct tps65132_regulator *tps = rdev_get_drvdata(rdev); | |
114 | int id = rdev_get_id(rdev); | |
115 | struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[id]; | |
116 | ||
117 | if (!IS_ERR(rpdata->en_gpiod)) | |
118 | return rpdata->ena_gpio_state; | |
119 | ||
120 | return 1; | |
121 | } | |
122 | ||
123 | static struct regulator_ops tps65132_regulator_ops = { | |
124 | .enable = tps65132_regulator_enable, | |
125 | .disable = tps65132_regulator_disable, | |
126 | .is_enabled = tps65132_regulator_is_enabled, | |
127 | .list_voltage = regulator_list_voltage_linear, | |
128 | .map_voltage = regulator_map_voltage_linear, | |
129 | .get_voltage_sel = regulator_get_voltage_sel_regmap, | |
130 | .set_voltage_sel = regulator_set_voltage_sel_regmap, | |
131 | .set_active_discharge = regulator_set_active_discharge_regmap, | |
132 | }; | |
133 | ||
134 | static int tps65132_of_parse_cb(struct device_node *np, | |
135 | const struct regulator_desc *desc, | |
136 | struct regulator_config *config) | |
137 | { | |
138 | struct tps65132_regulator *tps = config->driver_data; | |
139 | struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[desc->id]; | |
140 | int ret; | |
141 | ||
142 | rpdata->en_gpiod = devm_fwnode_get_index_gpiod_from_child(tps->dev, | |
143 | "enable", 0, &np->fwnode, 0, "enable"); | |
144 | if (IS_ERR(rpdata->en_gpiod)) { | |
145 | ret = PTR_ERR(rpdata->en_gpiod); | |
146 | ||
147 | /* Ignore the error other than probe defer */ | |
148 | if (ret == -EPROBE_DEFER) | |
149 | return ret; | |
150 | return 0; | |
151 | } | |
152 | ||
153 | rpdata->act_dis_gpiod = devm_fwnode_get_index_gpiod_from_child( | |
154 | tps->dev, "active-discharge", 0, | |
155 | &np->fwnode, 0, "active-discharge"); | |
156 | if (IS_ERR(rpdata->act_dis_gpiod)) { | |
157 | ret = PTR_ERR(rpdata->act_dis_gpiod); | |
158 | ||
159 | /* Ignore the error other than probe defer */ | |
160 | if (ret == -EPROBE_DEFER) | |
161 | return ret; | |
162 | ||
163 | return 0; | |
164 | } | |
165 | ||
166 | ret = of_property_read_u32(np, "ti,active-discharge-time-us", | |
167 | &rpdata->act_dis_time_us); | |
168 | if (ret < 0) { | |
169 | dev_err(tps->dev, "Failed to read active discharge time:%d\n", | |
170 | ret); | |
171 | return ret; | |
172 | } | |
173 | ||
174 | return 0; | |
175 | } | |
176 | ||
177 | #define TPS65132_REGULATOR_DESC(_id, _name) \ | |
178 | [TPS65132_REGULATOR_ID_##_id] = { \ | |
179 | .name = "tps65132-"#_name, \ | |
180 | .supply_name = "vin", \ | |
181 | .id = TPS65132_REGULATOR_ID_##_id, \ | |
182 | .of_match = of_match_ptr(#_name), \ | |
183 | .of_parse_cb = tps65132_of_parse_cb, \ | |
184 | .ops = &tps65132_regulator_ops, \ | |
185 | .n_voltages = TPS65132_VOUT_N_VOLTAGE, \ | |
186 | .min_uV = TPS65132_VOUT_VMIN, \ | |
187 | .uV_step = TPS65132_VOUT_STEP, \ | |
188 | .enable_time = 500, \ | |
189 | .vsel_mask = TPS65132_VOUT_MASK, \ | |
190 | .vsel_reg = TPS65132_REG_##_id, \ | |
191 | .active_discharge_off = 0, \ | |
192 | .active_discharge_on = TPS65132_REG_APPS_DIS_##_id, \ | |
193 | .active_discharge_mask = TPS65132_REG_APPS_DIS_##_id, \ | |
194 | .active_discharge_reg = TPS65132_REG_APPS_DISP_DISN, \ | |
195 | .type = REGULATOR_VOLTAGE, \ | |
196 | .owner = THIS_MODULE, \ | |
197 | } | |
198 | ||
199 | static struct regulator_desc tps_regs_desc[TPS65132_MAX_REGULATORS] = { | |
200 | TPS65132_REGULATOR_DESC(VPOS, outp), | |
201 | TPS65132_REGULATOR_DESC(VNEG, outn), | |
202 | }; | |
203 | ||
204 | static const struct regmap_range tps65132_no_reg_ranges[] = { | |
205 | regmap_reg_range(TPS65132_REG_APPS_DISP_DISN + 1, | |
206 | TPS65132_REG_CONTROL - 1), | |
207 | }; | |
208 | ||
209 | static const struct regmap_access_table tps65132_no_reg_table = { | |
210 | .no_ranges = tps65132_no_reg_ranges, | |
211 | .n_no_ranges = ARRAY_SIZE(tps65132_no_reg_ranges), | |
212 | }; | |
213 | ||
214 | static const struct regmap_config tps65132_regmap_config = { | |
215 | .reg_bits = 8, | |
216 | .val_bits = 8, | |
5abca06c | 217 | .max_register = TPS65132_REG_CONTROL, |
77c129bf VRT |
218 | .cache_type = REGCACHE_NONE, |
219 | .rd_table = &tps65132_no_reg_table, | |
220 | .wr_table = &tps65132_no_reg_table, | |
221 | }; | |
222 | ||
223 | static int tps65132_probe(struct i2c_client *client, | |
224 | const struct i2c_device_id *client_id) | |
225 | { | |
226 | struct device *dev = &client->dev; | |
227 | struct tps65132_regulator *tps; | |
228 | struct regulator_config config = { }; | |
229 | int id; | |
230 | int ret; | |
231 | ||
232 | tps = devm_kzalloc(dev, sizeof(*tps), GFP_KERNEL); | |
233 | if (!tps) | |
234 | return -ENOMEM; | |
235 | ||
236 | tps->rmap = devm_regmap_init_i2c(client, &tps65132_regmap_config); | |
237 | if (IS_ERR(tps->rmap)) { | |
238 | ret = PTR_ERR(tps->rmap); | |
239 | dev_err(dev, "regmap init failed: %d\n", ret); | |
240 | return ret; | |
241 | } | |
242 | ||
243 | i2c_set_clientdata(client, tps); | |
244 | tps->dev = dev; | |
245 | ||
246 | for (id = 0; id < TPS65132_MAX_REGULATORS; ++id) { | |
247 | tps->rdesc[id] = &tps_regs_desc[id]; | |
248 | ||
249 | config.regmap = tps->rmap; | |
250 | config.dev = dev; | |
251 | config.driver_data = tps; | |
252 | ||
253 | tps->rdev[id] = devm_regulator_register(dev, | |
254 | tps->rdesc[id], &config); | |
255 | if (IS_ERR(tps->rdev[id])) { | |
256 | ret = PTR_ERR(tps->rdev[id]); | |
257 | dev_err(dev, "regulator %s register failed: %d\n", | |
258 | tps->rdesc[id]->name, ret); | |
259 | return ret; | |
260 | } | |
261 | } | |
262 | return 0; | |
263 | } | |
264 | ||
265 | static const struct i2c_device_id tps65132_id[] = { | |
266 | {.name = "tps65132",}, | |
267 | {}, | |
268 | }; | |
269 | MODULE_DEVICE_TABLE(i2c, tps65132_id); | |
270 | ||
271 | static struct i2c_driver tps65132_i2c_driver = { | |
272 | .driver = { | |
273 | .name = "tps65132", | |
77c129bf VRT |
274 | }, |
275 | .probe = tps65132_probe, | |
276 | .id_table = tps65132_id, | |
277 | }; | |
278 | ||
279 | module_i2c_driver(tps65132_i2c_driver); | |
280 | ||
281 | MODULE_DESCRIPTION("tps65132 regulator driver"); | |
282 | MODULE_AUTHOR("Venkat Reddy Talla <vreddytalla@nvidia.com>"); | |
283 | MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>"); | |
284 | MODULE_LICENSE("GPL v2"); |