1 /*
2 * LP8752 High Performance Power Management Unit : System Interface Driver
3 *
4 * Author: zhangqing <zhangqing@rock-chips.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 */
11
12 #include <linux/module.h>
13 #include <linux/slab.h>
14 #include <linux/i2c.h>
15 #include <linux/err.h>
16 #include <linux/irq.h>
17 #include <linux/interrupt.h>
18 #include <linux/gpio.h>
19 #include <linux/regmap.h>
20 #include <linux/uaccess.h>
21 #include <linux/regulator/driver.h>
22 #include <linux/regulator/of_regulator.h>
23 #include <linux/regulator/machine.h>
24
25 #define LP8752_CTRL_BUCK0 0x02
26 #define LP8752_CTRL_BUCK1 0x04
27 #define LP8752_CTRL_BUCK2 0x06
28 #define LP8752_CTRL_BUCK3 0x08
29
30 #define LP8752_VOUT_BUCK0 0x0a
31 #define LP8752_VOUT_BUCK1 0x0c
32 #define LP8752_VOUT_BUCK2 0x0e
33 #define LP8752_VOUT_BUCK3 0x10
34
35 #define LP8752_BUCK_VSEL_MASK 0xff
36 #define LP8752_REG_MAX 0x2f
37
38 enum lp8752_bucks {
39 LP8752_BUCK0 = 0,
40 LP8752_BUCK1,
41 LP8752_BUCK2,
42 LP8752_BUCK3,
43 LP8752_BUCK_MAX,
44 };
45
46 static const struct linear_range lp8752_buck_voltage_ranges[] = {
47 REGULATOR_LINEAR_RANGE(500000, 0, 23, 10000),
48 REGULATOR_LINEAR_RANGE(735000, 24, 157, 5000),
49 REGULATOR_LINEAR_RANGE(1420000, 158, 255, 20000),
50 };
51
52 struct lp8752_platform_data {
53 int nphase;
54 struct device_node *of_node[LP8752_BUCK_MAX];
55 struct regulator_desc desc;
56 struct regulator_init_data *buck_data[LP8752_BUCK_MAX];
57 };
58
59 struct lp8752_mphase {
60 int nreg;
61 int buck_id[LP8752_BUCK_MAX];
62 };
63
64 struct lp8752_chip {
65 int nphase;
66 struct device *dev;
67 struct regmap *regmap;
68 struct lp8752_platform_data *pdata;
69 struct regulator_dev *rdev[LP8752_BUCK_MAX];
70 };
71
lp8752_buck_set_mode(struct regulator_dev * rdev,unsigned int mode)72 static int lp8752_buck_set_mode(struct regulator_dev *rdev, unsigned int mode)
73 {
74 struct lp8752_chip *pchip = rdev_get_drvdata(rdev);
75 u8 msk = BIT(1);
76 int ret;
77
78 switch (mode) {
79 case REGULATOR_MODE_FAST:
80 /* forced pwm mode */
81 ret = regmap_update_bits(pchip->regmap,
82 rdev->desc->enable_reg,
83 msk, 0x1);
84 break;
85 case REGULATOR_MODE_NORMAL:
86 /* automatic pwm/pfm mode */
87 ret = regmap_update_bits(pchip->regmap,
88 rdev->desc->enable_reg,
89 msk, 0x0);
90 break;
91 default:
92 dev_err(pchip->dev, "error:lp8752 only support auto and pwm mode\n");
93 ret = -EINVAL;
94 break;
95 }
96
97 return ret;
98 }
99
lp8752_buck_get_mode(struct regulator_dev * rdev)100 static unsigned int lp8752_buck_get_mode(struct regulator_dev *rdev)
101 {
102 struct lp8752_chip *pchip = rdev_get_drvdata(rdev);
103 int ret;
104 unsigned int reg;
105
106 ret = regmap_read(pchip->regmap, rdev->desc->enable_reg, ®);
107 if (ret < 0) {
108 dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
109 return ret;
110 }
111
112 return (reg & BIT(1)) ? REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL;
113 }
114
115 static struct regulator_ops lp8752_buck_ops = {
116 .map_voltage = regulator_map_voltage_linear_range,
117 .list_voltage = regulator_list_voltage_linear_range,
118 .set_voltage_sel = regulator_set_voltage_sel_regmap,
119 .get_voltage_sel = regulator_get_voltage_sel_regmap,
120 .set_voltage_time_sel = regulator_set_voltage_time_sel,
121 .enable = regulator_enable_regmap,
122 .disable = regulator_disable_regmap,
123 .is_enabled = regulator_is_enabled_regmap,
124 .set_mode = lp8752_buck_set_mode,
125 .get_mode = lp8752_buck_get_mode,
126 };
127
128 #define lp8752_rail(_id) "lp8752_buck"#_id
129 #define vin(_id) "vin"#_id
130
131 static const struct lp8752_mphase mphase_buck[] = {
132 { 1, { LP8752_BUCK0} },
133 { 2, { LP8752_BUCK0, LP8752_BUCK3 } },
134 { 3, { LP8752_BUCK0, LP8752_BUCK2, LP8752_BUCK3 } },
135 { 4, { LP8752_BUCK0, LP8752_BUCK1, LP8752_BUCK2, LP8752_BUCK3 } },
136 };
137
138 static struct of_regulator_match lp8752_reg_matches[] = {
139 { .name = "lp8752_buck0", .driver_data = (void *)0 },
140 { .name = "lp8752_buck1", .driver_data = (void *)1 },
141 { .name = "lp8752_buck2", .driver_data = (void *)2 },
142 { .name = "lp8752_buck3", .driver_data = (void *)3 },
143 };
144
lp8752_init_data(struct lp8752_chip * pchip)145 static int lp8752_init_data(struct lp8752_chip *pchip)
146 {
147 int icnt, buck_id, count;
148 struct lp8752_platform_data *pdata = pchip->pdata;
149 struct device_node *regs, *lp8752_np;
150
151 lp8752_np = of_node_get(pchip->dev->of_node);
152 if (!lp8752_np) {
153 dev_err(pchip->dev, "Failed to find device node\n");
154 return -ENODEV;
155 }
156
157 regs = of_find_node_by_name(lp8752_np, "regulators");
158 if (!regs)
159 return -ENODEV;
160
161 count = of_regulator_match(pchip->dev, regs, lp8752_reg_matches,
162 LP8752_BUCK_MAX);
163 of_node_put(regs);
164 if ((count <= 0) || (count > LP8752_BUCK_MAX))
165 return -ENODEV;
166
167 pchip->nphase = (count - 1) & 0xf;
168
169 /* set default data based on multi-phase config */
170 for (icnt = 0; icnt < mphase_buck[pchip->nphase].nreg; icnt++) {
171 buck_id = mphase_buck[pchip->nphase].buck_id[icnt];
172 pdata->buck_data[buck_id] =
173 lp8752_reg_matches[buck_id].init_data;
174 pdata->of_node[buck_id] = lp8752_reg_matches[buck_id].of_node;
175 }
176
177 return 0;
178 }
179
180 #define lp8752_buck_desc(_id)\
181 {\
182 .name = lp8752_rail(_id),\
183 .id = LP8752_BUCK##_id,\
184 .supply_name = vin(_id),\
185 .ops = &lp8752_buck_ops,\
186 .n_voltages = LP8752_BUCK_VSEL_MASK + 1,\
187 .linear_ranges = lp8752_buck_voltage_ranges,\
188 .n_linear_ranges = ARRAY_SIZE(lp8752_buck_voltage_ranges),\
189 .type = REGULATOR_VOLTAGE,\
190 .enable_reg = LP8752_CTRL_BUCK##_id,\
191 .enable_mask = BIT(7),\
192 .vsel_reg = LP8752_VOUT_BUCK##_id,\
193 .vsel_mask = LP8752_BUCK_VSEL_MASK,\
194 .enable_time = 400,\
195 .owner = THIS_MODULE,\
196 }
197
198 static struct regulator_desc lp8752_reg_desc[] = {
199 lp8752_buck_desc(0),
200 lp8752_buck_desc(1),
201 lp8752_buck_desc(2),
202 lp8752_buck_desc(3),
203 };
204
lp8752_regulator_init(struct lp8752_chip * pchip)205 static int lp8752_regulator_init(struct lp8752_chip *pchip)
206 {
207 int ret, icnt, buck_id;
208 struct lp8752_platform_data *pdata = pchip->pdata;
209 struct regulator_config rconfig = { };
210
211 rconfig.regmap = pchip->regmap;
212 rconfig.dev = pchip->dev;
213 rconfig.driver_data = pchip;
214
215 for (icnt = 0; icnt < mphase_buck[pchip->nphase].nreg; icnt++) {
216 buck_id = mphase_buck[pchip->nphase].buck_id[icnt];
217 rconfig.init_data = pdata->buck_data[buck_id];
218 rconfig.of_node = pdata->of_node[buck_id];
219 pchip->rdev[buck_id] =
220 devm_regulator_register(pchip->dev,
221 &lp8752_reg_desc[buck_id],
222 &rconfig);
223 if (IS_ERR(pchip->rdev[buck_id])) {
224 ret = PTR_ERR(pchip->rdev[buck_id]);
225 pchip->rdev[buck_id] = NULL;
226 dev_err(pchip->dev, "regulator init failed: buck %d\n",
227 buck_id);
228 return ret;
229 }
230 }
231
232 return 0;
233 }
234
235 static const struct regmap_config lp8752_regmap = {
236 .reg_bits = 8,
237 .val_bits = 8,
238 .max_register = LP8752_REG_MAX,
239 };
240
lp8752_probe(struct i2c_client * client,const struct i2c_device_id * id)241 static int lp8752_probe(struct i2c_client *client,
242 const struct i2c_device_id *id)
243 {
244 int ret;
245 struct lp8752_chip *pchip;
246 struct lp8752_platform_data *pdata = dev_get_platdata(&client->dev);
247
248 pchip = devm_kzalloc(&client->dev,
249 sizeof(struct lp8752_chip), GFP_KERNEL);
250 if (!pchip)
251 return -ENOMEM;
252
253 pchip->dev = &client->dev;
254 pchip->regmap = devm_regmap_init_i2c(client, &lp8752_regmap);
255 if (IS_ERR(pchip->regmap)) {
256 ret = PTR_ERR(pchip->regmap);
257 dev_err(&client->dev, "fail to allocate regmap %d\n", ret);
258 return ret;
259 }
260 i2c_set_clientdata(client, pchip);
261
262 ret = regmap_update_bits(pchip->regmap,
263 LP8752_CTRL_BUCK0,
264 (1 << 0), 0);
265 ret = regmap_update_bits(pchip->regmap,
266 LP8752_CTRL_BUCK2,
267 (1 << 0), 0);
268
269 if (!pdata) {
270 pchip->pdata = devm_kzalloc(pchip->dev,
271 sizeof(struct lp8752_platform_data),
272 GFP_KERNEL);
273 if (!pchip->pdata)
274 return -ENOMEM;
275
276 ret = lp8752_init_data(pchip);
277 if (ret < 0) {
278 dev_err(&client->dev, "fail to initialize chip\n");
279 return ret;
280 }
281 } else {
282 pchip->pdata = pdata;
283 pchip->nphase = pdata->nphase;
284 }
285
286 lp8752_regulator_init(pchip);
287
288 return 0;
289 }
290
291 static const struct of_device_id lp8752_of_match[] = {
292 { .compatible = "ti,lp8752", },
293 {},
294 };
295 MODULE_DEVICE_TABLE(of, lp8752_of_match);
296
297 static const struct i2c_device_id lp8752_id[] = {
298 {"lp8752", 0},
299 {}
300 };
301 MODULE_DEVICE_TABLE(i2c, lp8752_id);
302
303 static struct i2c_driver lp8752_i2c_driver = {
304 .probe = lp8752_probe,
305 .id_table = lp8752_id,
306 .driver = {
307 .name = "lp8752",
308 .of_match_table = of_match_ptr(lp8752_of_match),
309 },
310 };
311
312 module_i2c_driver(lp8752_i2c_driver);
313
314 MODULE_DESCRIPTION("Texas Instruments lp8752 driver");
315 MODULE_AUTHOR("Zhang Qing <zhangqing@rock-chips.com>");
316 MODULE_LICENSE("GPL v2");
317