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 tps65132_reg_pdata reg_pdata[TPS65132_MAX_REGULATORS]; |
59 | }; |
60 | |
61 | static int tps65132_regulator_enable(struct regulator_dev *rdev) |
62 | { |
63 | struct tps65132_regulator *tps = rdev_get_drvdata(rdev); |
64 | int id = rdev_get_id(rdev); |
65 | struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[id]; |
66 | int ret; |
67 | |
68 | if (!IS_ERR(ptr: rpdata->en_gpiod)) { |
69 | gpiod_set_value_cansleep(desc: rpdata->en_gpiod, value: 1); |
70 | rpdata->ena_gpio_state = 1; |
71 | } |
72 | |
73 | /* Hardware automatically enable discharge bit in enable */ |
74 | if (rdev->constraints->active_discharge == |
75 | REGULATOR_ACTIVE_DISCHARGE_DISABLE) { |
76 | ret = regulator_set_active_discharge_regmap(rdev, enable: false); |
77 | if (ret < 0) { |
78 | dev_err(tps->dev, "Failed to disable active discharge: %d\n" , |
79 | ret); |
80 | return ret; |
81 | } |
82 | } |
83 | |
84 | return 0; |
85 | } |
86 | |
87 | static int tps65132_regulator_disable(struct regulator_dev *rdev) |
88 | { |
89 | struct tps65132_regulator *tps = rdev_get_drvdata(rdev); |
90 | int id = rdev_get_id(rdev); |
91 | struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[id]; |
92 | |
93 | if (!IS_ERR(ptr: rpdata->en_gpiod)) { |
94 | gpiod_set_value_cansleep(desc: rpdata->en_gpiod, value: 0); |
95 | rpdata->ena_gpio_state = 0; |
96 | } |
97 | |
98 | if (!IS_ERR(ptr: rpdata->act_dis_gpiod)) { |
99 | gpiod_set_value_cansleep(desc: rpdata->act_dis_gpiod, value: 1); |
100 | usleep_range(min: rpdata->act_dis_time_us, max: rpdata->act_dis_time_us + |
101 | TPS65132_ACT_DIS_TIME_SLACK); |
102 | gpiod_set_value_cansleep(desc: rpdata->act_dis_gpiod, value: 0); |
103 | } |
104 | |
105 | return 0; |
106 | } |
107 | |
108 | static int tps65132_regulator_is_enabled(struct regulator_dev *rdev) |
109 | { |
110 | struct tps65132_regulator *tps = rdev_get_drvdata(rdev); |
111 | int id = rdev_get_id(rdev); |
112 | struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[id]; |
113 | |
114 | if (!IS_ERR(ptr: rpdata->en_gpiod)) |
115 | return rpdata->ena_gpio_state; |
116 | |
117 | return 1; |
118 | } |
119 | |
120 | static const struct regulator_ops tps65132_regulator_ops = { |
121 | .enable = tps65132_regulator_enable, |
122 | .disable = tps65132_regulator_disable, |
123 | .is_enabled = tps65132_regulator_is_enabled, |
124 | .list_voltage = regulator_list_voltage_linear, |
125 | .map_voltage = regulator_map_voltage_linear, |
126 | .get_voltage_sel = regulator_get_voltage_sel_regmap, |
127 | .set_voltage_sel = regulator_set_voltage_sel_regmap, |
128 | .set_active_discharge = regulator_set_active_discharge_regmap, |
129 | }; |
130 | |
131 | static int tps65132_of_parse_cb(struct device_node *np, |
132 | const struct regulator_desc *desc, |
133 | struct regulator_config *config) |
134 | { |
135 | struct tps65132_regulator *tps = config->driver_data; |
136 | struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[desc->id]; |
137 | int ret; |
138 | |
139 | rpdata->en_gpiod = devm_fwnode_gpiod_get(dev: tps->dev, of_fwnode_handle(np), |
140 | con_id: "enable" , flags: GPIOD_ASIS, |
141 | label: "enable" ); |
142 | if (IS_ERR(ptr: rpdata->en_gpiod)) { |
143 | ret = PTR_ERR(ptr: rpdata->en_gpiod); |
144 | |
145 | /* Ignore the error other than probe defer */ |
146 | if (ret == -EPROBE_DEFER) |
147 | return ret; |
148 | return 0; |
149 | } |
150 | |
151 | rpdata->act_dis_gpiod = devm_fwnode_gpiod_get(dev: tps->dev, |
152 | of_fwnode_handle(np), |
153 | con_id: "active-discharge" , |
154 | flags: GPIOD_ASIS, |
155 | label: "active-discharge" ); |
156 | if (IS_ERR(ptr: rpdata->act_dis_gpiod)) { |
157 | ret = PTR_ERR(ptr: 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, propname: "ti,active-discharge-time-us" , |
167 | out_value: &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 const 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, |
217 | .max_register = TPS65132_REG_CONTROL, |
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 | { |
225 | struct device *dev = &client->dev; |
226 | struct tps65132_regulator *tps; |
227 | struct regulator_dev *rdev; |
228 | struct regmap *rmap; |
229 | struct regulator_config config = { }; |
230 | int id; |
231 | int ret; |
232 | |
233 | tps = devm_kzalloc(dev, size: sizeof(*tps), GFP_KERNEL); |
234 | if (!tps) |
235 | return -ENOMEM; |
236 | |
237 | rmap = devm_regmap_init_i2c(client, &tps65132_regmap_config); |
238 | if (IS_ERR(ptr: rmap)) { |
239 | ret = PTR_ERR(ptr: rmap); |
240 | dev_err(dev, "regmap init failed: %d\n" , ret); |
241 | return ret; |
242 | } |
243 | |
244 | i2c_set_clientdata(client, data: tps); |
245 | tps->dev = dev; |
246 | |
247 | for (id = 0; id < TPS65132_MAX_REGULATORS; ++id) { |
248 | config.regmap = rmap; |
249 | config.dev = dev; |
250 | config.driver_data = tps; |
251 | |
252 | rdev = devm_regulator_register(dev, regulator_desc: &tps_regs_desc[id], |
253 | config: &config); |
254 | if (IS_ERR(ptr: rdev)) { |
255 | ret = PTR_ERR(ptr: rdev); |
256 | dev_err(dev, "regulator %s register failed: %d\n" , |
257 | tps_regs_desc[id].name, ret); |
258 | return ret; |
259 | } |
260 | } |
261 | return 0; |
262 | } |
263 | |
264 | static const struct i2c_device_id tps65132_id[] = { |
265 | {.name = "tps65132" ,}, |
266 | {}, |
267 | }; |
268 | MODULE_DEVICE_TABLE(i2c, tps65132_id); |
269 | |
270 | static struct i2c_driver tps65132_i2c_driver = { |
271 | .driver = { |
272 | .name = "tps65132" , |
273 | .probe_type = PROBE_PREFER_ASYNCHRONOUS, |
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" ); |
285 | |