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cdc-acm: add TIOCMIWAIT
[linux/fpc-iii.git] / drivers / regulator / tps51632-regulator.c
blobb0a3f0917a27ea841f3fffefdda7b67b163e8168
1 /*
2 * tps51632-regulator.c -- TI TPS51632
3 *
4 * Regulator driver for TPS51632 3-2-1 Phase D-Cap Step Down Driverless
5 * Controller with serial VID control and DVFS.
6 *
7 * Copyright (c) 2012, NVIDIA Corporation.
8 *
9 * Author: Laxman Dewangan <ldewangan@nvidia.com>
10 *
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License as
13 * published by the Free Software Foundation version 2.
14 *
15 * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
16 * whether express or implied; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
23 * 02111-1307, USA
24 */
25
26 #include <linux/err.h>
27 #include <linux/i2c.h>
28 #include <linux/init.h>
29 #include <linux/kernel.h>
30 #include <linux/module.h>
31 #include <linux/of.h>
32 #include <linux/of_device.h>
33 #include <linux/platform_device.h>
34 #include <linux/regmap.h>
35 #include <linux/regulator/driver.h>
36 #include <linux/regulator/machine.h>
37 #include <linux/regulator/of_regulator.h>
38 #include <linux/regulator/tps51632-regulator.h>
39 #include <linux/slab.h>
40
41 /* Register definitions */
42 #define TPS51632_VOLTAGE_SELECT_REG 0x0
43 #define TPS51632_VOLTAGE_BASE_REG 0x1
44 #define TPS51632_OFFSET_REG 0x2
45 #define TPS51632_IMON_REG 0x3
46 #define TPS51632_VMAX_REG 0x4
47 #define TPS51632_DVFS_CONTROL_REG 0x5
48 #define TPS51632_POWER_STATE_REG 0x6
49 #define TPS51632_SLEW_REGS 0x7
50 #define TPS51632_FAULT_REG 0x14
51
52 #define TPS51632_MAX_REG 0x15
53
54 #define TPS51632_VOUT_MASK 0x7F
55 #define TPS51632_VOUT_OFFSET_MASK 0x1F
56 #define TPS51632_VMAX_MASK 0x7F
57 #define TPS51632_VMAX_LOCK 0x80
58
59 /* TPS51632_DVFS_CONTROL_REG */
60 #define TPS51632_DVFS_PWMEN 0x1
61 #define TPS51632_DVFS_STEP_20 0x2
62 #define TPS51632_DVFS_VMAX_PG 0x4
63 #define TPS51632_DVFS_PWMRST 0x8
64 #define TPS51632_DVFS_OCA_EN 0x10
65 #define TPS51632_DVFS_FCCM 0x20
66
67 /* TPS51632_POWER_STATE_REG */
68 #define TPS51632_POWER_STATE_MASK 0x03
69 #define TPS51632_POWER_STATE_MULTI_PHASE_CCM 0x0
70 #define TPS51632_POWER_STATE_SINGLE_PHASE_CCM 0x1
71 #define TPS51632_POWER_STATE_SINGLE_PHASE_DCM 0x2
72
73 #define TPS51632_MIN_VOLATGE 500000
74 #define TPS51632_MAX_VOLATGE 1520000
75 #define TPS51632_VOLATGE_STEP_10mV 10000
76 #define TPS51632_VOLATGE_STEP_20mV 20000
77 #define TPS51632_MAX_VSEL 0x7F
78 #define TPS51632_MIN_VSEL 0x19
79 #define TPS51632_DEFAULT_RAMP_DELAY 6000
80 #define TPS51632_VOLT_VSEL(uV) \
81 (DIV_ROUND_UP(uV - TPS51632_MIN_VOLATGE, \
82 TPS51632_VOLATGE_STEP_10mV) + \
83 TPS51632_MIN_VSEL)
84
85 /* TPS51632 chip information */
86 struct tps51632_chip {
87 struct device *dev;
88 struct regulator_desc desc;
89 struct regulator_dev *rdev;
90 struct regmap *regmap;
91 };
92
93 static int tps51632_dcdc_set_ramp_delay(struct regulator_dev *rdev,
94 int ramp_delay)
95 {
96 struct tps51632_chip *tps = rdev_get_drvdata(rdev);
97 int bit = ramp_delay/6000;
98 int ret;
99
100 if (bit)
101 bit--;
102 ret = regmap_write(tps->regmap, TPS51632_SLEW_REGS, BIT(bit));
103 if (ret < 0)
104 dev_err(tps->dev, "SLEW reg write failed, err %d\n", ret);
105 return ret;
106 }
107
108 static struct regulator_ops tps51632_dcdc_ops = {
109 .get_voltage_sel = regulator_get_voltage_sel_regmap,
110 .set_voltage_sel = regulator_set_voltage_sel_regmap,
111 .list_voltage = regulator_list_voltage_linear,
112 .set_voltage_time_sel = regulator_set_voltage_time_sel,
113 .set_ramp_delay = tps51632_dcdc_set_ramp_delay,
114 };
115
116 static int tps51632_init_dcdc(struct tps51632_chip *tps,
117 struct tps51632_regulator_platform_data *pdata)
118 {
119 int ret;
120 uint8_t control = 0;
121 int vsel;
122
123 if (!pdata->enable_pwm_dvfs)
124 goto skip_pwm_config;
125
126 control |= TPS51632_DVFS_PWMEN;
127 vsel = TPS51632_VOLT_VSEL(pdata->base_voltage_uV);
128 ret = regmap_write(tps->regmap, TPS51632_VOLTAGE_BASE_REG, vsel);
129 if (ret < 0) {
130 dev_err(tps->dev, "BASE reg write failed, err %d\n", ret);
131 return ret;
132 }
133
134 if (pdata->dvfs_step_20mV)
135 control |= TPS51632_DVFS_STEP_20;
136
137 if (pdata->max_voltage_uV) {
138 unsigned int vmax;
139 /**
140 * TPS51632 hw behavior: VMAX register can be write only
141 * once as it get locked after first write. The lock get
142 * reset only when device is power-reset.
143 * Write register only when lock bit is not enabled.
144 */
145 ret = regmap_read(tps->regmap, TPS51632_VMAX_REG, &vmax);
146 if (ret < 0) {
147 dev_err(tps->dev, "VMAX read failed, err %d\n", ret);
148 return ret;
149 }
150 if (!(vmax & TPS51632_VMAX_LOCK)) {
151 vsel = TPS51632_VOLT_VSEL(pdata->max_voltage_uV);
152 ret = regmap_write(tps->regmap, TPS51632_VMAX_REG,
153 vsel);
154 if (ret < 0) {
155 dev_err(tps->dev,
156 "VMAX write failed, err %d\n", ret);
157 return ret;
158 }
159 }
160 }
161
162 skip_pwm_config:
163 ret = regmap_write(tps->regmap, TPS51632_DVFS_CONTROL_REG, control);
164 if (ret < 0)
165 dev_err(tps->dev, "DVFS reg write failed, err %d\n", ret);
166 return ret;
167 }
168
169 static bool is_volatile_reg(struct device *dev, unsigned int reg)
170 {
171 switch (reg) {
172 case TPS51632_OFFSET_REG:
173 case TPS51632_FAULT_REG:
174 case TPS51632_IMON_REG:
175 return true;
176 default:
177 return false;
178 }
179 }
180
181 static bool is_read_reg(struct device *dev, unsigned int reg)
182 {
183 switch (reg) {
184 case 0x08 ... 0x0F:
185 return false;
186 default:
187 return true;
188 }
189 }
190
191 static bool is_write_reg(struct device *dev, unsigned int reg)
192 {
193 switch (reg) {
194 case TPS51632_VOLTAGE_SELECT_REG:
195 case TPS51632_VOLTAGE_BASE_REG:
196 case TPS51632_VMAX_REG:
197 case TPS51632_DVFS_CONTROL_REG:
198 case TPS51632_POWER_STATE_REG:
199 case TPS51632_SLEW_REGS:
200 return true;
201 default:
202 return false;
203 }
204 }
205
206 static const struct regmap_config tps51632_regmap_config = {
207 .reg_bits = 8,
208 .val_bits = 8,
209 .writeable_reg = is_write_reg,
210 .readable_reg = is_read_reg,
211 .volatile_reg = is_volatile_reg,
212 .max_register = TPS51632_MAX_REG - 1,
213 .cache_type = REGCACHE_RBTREE,
214 };
215
216 #if defined(CONFIG_OF)
217 static const struct of_device_id tps51632_of_match[] = {
218 { .compatible = "ti,tps51632",},
219 {},
220 };
221 MODULE_DEVICE_TABLE(of, tps51632_of_match);
222
223 static struct tps51632_regulator_platform_data *
224 of_get_tps51632_platform_data(struct device *dev)
225 {
226 struct tps51632_regulator_platform_data *pdata;
227 struct device_node *np = dev->of_node;
228
229 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
230 if (!pdata) {
231 dev_err(dev, "Memory alloc failed for platform data\n");
232 return NULL;
233 }
234
235 pdata->reg_init_data = of_get_regulator_init_data(dev, dev->of_node);
236 if (!pdata->reg_init_data) {
237 dev_err(dev, "Not able to get OF regulator init data\n");
238 return NULL;
239 }
240
241 pdata->enable_pwm_dvfs =
242 of_property_read_bool(np, "ti,enable-pwm-dvfs");
243 pdata->dvfs_step_20mV = of_property_read_bool(np, "ti,dvfs-step-20mV");
244
245 pdata->base_voltage_uV = pdata->reg_init_data->constraints.min_uV ? :
246 TPS51632_MIN_VOLATGE;
247 pdata->max_voltage_uV = pdata->reg_init_data->constraints.max_uV ? :
248 TPS51632_MAX_VOLATGE;
249 return pdata;
250 }
251 #else
252 static struct tps51632_regulator_platform_data *
253 of_get_tps51632_platform_data(struct device *dev)
254 {
255 return NULL;
256 }
257 #endif
258
259 static int tps51632_probe(struct i2c_client *client,
260 const struct i2c_device_id *id)
261 {
262 struct tps51632_regulator_platform_data *pdata;
263 struct regulator_dev *rdev;
264 struct tps51632_chip *tps;
265 int ret;
266 struct regulator_config config = { };
267
268 if (client->dev.of_node) {
269 const struct of_device_id *match;
270 match = of_match_device(of_match_ptr(tps51632_of_match),
271 &client->dev);
272 if (!match) {
273 dev_err(&client->dev, "Error: No device match found\n");
274 return -ENODEV;
275 }
276 }
277
278 pdata = dev_get_platdata(&client->dev);
279 if (!pdata && client->dev.of_node)
280 pdata = of_get_tps51632_platform_data(&client->dev);
281 if (!pdata) {
282 dev_err(&client->dev, "No Platform data\n");
283 return -EINVAL;
284 }
285
286 if (pdata->enable_pwm_dvfs) {
287 if ((pdata->base_voltage_uV < TPS51632_MIN_VOLATGE) ||
288 (pdata->base_voltage_uV > TPS51632_MAX_VOLATGE)) {
289 dev_err(&client->dev, "Invalid base_voltage_uV setting\n");
290 return -EINVAL;
291 }
292
293 if ((pdata->max_voltage_uV) &&
294 ((pdata->max_voltage_uV < TPS51632_MIN_VOLATGE) ||
295 (pdata->max_voltage_uV > TPS51632_MAX_VOLATGE))) {
296 dev_err(&client->dev, "Invalid max_voltage_uV setting\n");
297 return -EINVAL;
298 }
299 }
300
301 tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
302 if (!tps) {
303 dev_err(&client->dev, "Memory allocation failed\n");
304 return -ENOMEM;
305 }
306
307 tps->dev = &client->dev;
308 tps->desc.name = id->name;
309 tps->desc.id = 0;
310 tps->desc.ramp_delay = TPS51632_DEFAULT_RAMP_DELAY;
311 tps->desc.min_uV = TPS51632_MIN_VOLATGE;
312 tps->desc.uV_step = TPS51632_VOLATGE_STEP_10mV;
313 tps->desc.linear_min_sel = TPS51632_MIN_VSEL;
314 tps->desc.n_voltages = TPS51632_MAX_VSEL + 1;
315 tps->desc.ops = &tps51632_dcdc_ops;
316 tps->desc.type = REGULATOR_VOLTAGE;
317 tps->desc.owner = THIS_MODULE;
318
319 if (pdata->enable_pwm_dvfs)
320 tps->desc.vsel_reg = TPS51632_VOLTAGE_BASE_REG;
321 else
322 tps->desc.vsel_reg = TPS51632_VOLTAGE_SELECT_REG;
323 tps->desc.vsel_mask = TPS51632_VOUT_MASK;
324
325 tps->regmap = devm_regmap_init_i2c(client, &tps51632_regmap_config);
326 if (IS_ERR(tps->regmap)) {
327 ret = PTR_ERR(tps->regmap);
328 dev_err(&client->dev, "regmap init failed, err %d\n", ret);
329 return ret;
330 }
331 i2c_set_clientdata(client, tps);
332
333 ret = tps51632_init_dcdc(tps, pdata);
334 if (ret < 0) {
335 dev_err(tps->dev, "Init failed, err = %d\n", ret);
336 return ret;
337 }
338
339 /* Register the regulators */
340 config.dev = &client->dev;
341 config.init_data = pdata->reg_init_data;
342 config.driver_data = tps;
343 config.regmap = tps->regmap;
344 config.of_node = client->dev.of_node;
345
346 rdev = devm_regulator_register(&client->dev, &tps->desc, &config);
347 if (IS_ERR(rdev)) {
348 dev_err(tps->dev, "regulator register failed\n");
349 return PTR_ERR(rdev);
350 }
351
352 tps->rdev = rdev;
353 return 0;
354 }
355
356 static const struct i2c_device_id tps51632_id[] = {
357 {.name = "tps51632",},
358 {},
359 };
360
361 MODULE_DEVICE_TABLE(i2c, tps51632_id);
362
363 static struct i2c_driver tps51632_i2c_driver = {
364 .driver = {
365 .name = "tps51632",
366 .owner = THIS_MODULE,
367 .of_match_table = of_match_ptr(tps51632_of_match),
368 },
369 .probe = tps51632_probe,
370 .id_table = tps51632_id,
371 };
372
373 static int __init tps51632_init(void)
374 {
375 return i2c_add_driver(&tps51632_i2c_driver);
376 }
377 subsys_initcall(tps51632_init);
378
379 static void __exit tps51632_cleanup(void)
380 {
381 i2c_del_driver(&tps51632_i2c_driver);
382 }
383 module_exit(tps51632_cleanup);
384
385 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
386 MODULE_DESCRIPTION("TPS51632 voltage regulator driver");
387 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support