diff options
author | Jonghwa Lee <jonghwa3.lee@samsung.com> | 2012-06-01 00:17:14 -0400 |
---|---|---|
committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2012-06-03 08:25:05 -0400 |
commit | 133d4016f1783b21e9458430fa7c0c610c010037 (patch) | |
tree | 61bbb80d096156a523782661bd8ab4897c6780f4 /drivers/regulator/max77686.c | |
parent | 27eeabb7a1000de974e45cd007b3f5324dcee490 (diff) |
regulator: MAX77686: Add Maxim 77686 regulator driver
Add driver for support max77686 regulator.
MAX77686 provides LDOs[1~26] and BUCKs[1~9]. It support to set or get the
volatege of regulator on max77686 chip with using regmap.
Signed-off-by: Chiwoong Byun <woong.byun@samsung.com>
Signed-off-by: Jonghwa Lee <jonghwa3.lee@samsung.com>
Signed-off-by: Myungjoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Reviewed-by: Yadwinder Singh Brar <yadi.brar@samsung.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'drivers/regulator/max77686.c')
-rw-r--r-- | drivers/regulator/max77686.c | 337 |
1 files changed, 337 insertions, 0 deletions
diff --git a/drivers/regulator/max77686.c b/drivers/regulator/max77686.c new file mode 100644 index 00000000000..70046f8032f --- /dev/null +++ b/drivers/regulator/max77686.c | |||
@@ -0,0 +1,337 @@ | |||
1 | /* | ||
2 | * max77686.c - Regulator driver for the Maxim 77686 | ||
3 | * | ||
4 | * Copyright (C) 2012 Samsung Electronics | ||
5 | * Chiwoong Byun <woong.byun@smasung.com> | ||
6 | * Jonghwa Lee <jonghwa3.lee@samsung.com> | ||
7 | * | ||
8 | * This program is free software; you can redistribute it and/or modify | ||
9 | * it under the terms of the GNU General Public License as published by | ||
10 | * the Free Software Foundation; either version 2 of the License, or | ||
11 | * (at your option) any later version. | ||
12 | * | ||
13 | * This program is distributed in the hope that it will be useful, | ||
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
16 | * GNU General Public License for more details. | ||
17 | * | ||
18 | * You should have received a copy of the GNU General Public License | ||
19 | * along with this program; if not, write to the Free Software | ||
20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | ||
21 | * | ||
22 | * This driver is based on max8997.c | ||
23 | */ | ||
24 | |||
25 | #include <linux/kernel.h> | ||
26 | #include <linux/bug.h> | ||
27 | #include <linux/delay.h> | ||
28 | #include <linux/err.h> | ||
29 | #include <linux/gpio.h> | ||
30 | #include <linux/slab.h> | ||
31 | #include <linux/platform_device.h> | ||
32 | #include <linux/regulator/driver.h> | ||
33 | #include <linux/regulator/machine.h> | ||
34 | #include <linux/mfd/max77686.h> | ||
35 | #include <linux/mfd/max77686-private.h> | ||
36 | |||
37 | #define MAX77686_LDO_MINUV 800000 | ||
38 | #define MAX77686_LDO_UVSTEP 50000 | ||
39 | #define MAX77686_LDO_LOW_MINUV 800000 | ||
40 | #define MAX77686_LDO_LOW_UVSTEP 25000 | ||
41 | #define MAX77686_BUCK_MINUV 750000 | ||
42 | #define MAX77686_BUCK_UVSTEP 50000 | ||
43 | #define MAX77686_DVS_MINUV 600000 | ||
44 | #define MAX77686_DVS_UVSTEP 12500 | ||
45 | |||
46 | #define MAX77686_OPMODE_SHIFT 6 | ||
47 | #define MAX77686_OPMODE_BUCK234_SHIFT 4 | ||
48 | #define MAX77686_OPMODE_MASK 0x3 | ||
49 | |||
50 | #define MAX77686_VSEL_MASK 0x3F | ||
51 | #define MAX77686_DVS_VSEL_MASK 0xFF | ||
52 | |||
53 | #define MAX77686_RAMP_RATE_MASK 0xC0 | ||
54 | |||
55 | #define MAX77686_REGULATORS MAX77686_REG_MAX | ||
56 | #define MAX77686_LDOS 26 | ||
57 | |||
58 | enum max77686_ramp_rate { | ||
59 | RAMP_RATE_13P75MV, | ||
60 | RAMP_RATE_27P5MV, | ||
61 | RAMP_RATE_55MV, | ||
62 | RAMP_RATE_NO_CTRL, /* 100mV/us */ | ||
63 | }; | ||
64 | |||
65 | struct max77686_data { | ||
66 | struct device *dev; | ||
67 | struct max77686_dev *iodev; | ||
68 | int num_regulators; | ||
69 | struct regulator_dev **rdev; | ||
70 | int ramp_delay; /* in mV/us */ | ||
71 | }; | ||
72 | |||
73 | static int max77686_set_dvs_voltage_time_sel(struct regulator_dev *rdev, | ||
74 | unsigned int old_selector, unsigned int new_selector) | ||
75 | { | ||
76 | struct max77686_data *max77686 = rdev_get_drvdata(rdev); | ||
77 | int ramp_rate[] = {13, 27, 55, 100}; | ||
78 | return (DIV_ROUND_UP(rdev->desc->uV_step | ||
79 | * abs(new_selector - old_selector), | ||
80 | ramp_rate[max77686->ramp_delay])); | ||
81 | } | ||
82 | |||
83 | static int max77686_set_voltage_time_sel(struct regulator_dev *rdev, | ||
84 | unsigned int old_selector, unsigned int new_selector) | ||
85 | { | ||
86 | /* Unconditionally 100 mV/us */ | ||
87 | return (DIV_ROUND_UP(rdev->desc->uV_step | ||
88 | * abs(new_selector - old_selector), 100)); | ||
89 | } | ||
90 | |||
91 | static struct regulator_ops max77686_ops = { | ||
92 | .list_voltage = regulator_list_voltage_linear, | ||
93 | .is_enabled = regulator_is_enabled_regmap, | ||
94 | .enable = regulator_enable_regmap, | ||
95 | .disable = regulator_disable_regmap, | ||
96 | .get_voltage_sel = regulator_get_voltage_sel_regmap, | ||
97 | .set_voltage_sel = regulator_set_voltage_sel_regmap, | ||
98 | .set_voltage_time_sel = max77686_set_voltage_time_sel, | ||
99 | }; | ||
100 | |||
101 | static struct regulator_ops max77686_buck_dvs_ops = { | ||
102 | .list_voltage = regulator_list_voltage_linear, | ||
103 | .is_enabled = regulator_is_enabled_regmap, | ||
104 | .enable = regulator_enable_regmap, | ||
105 | .disable = regulator_disable_regmap, | ||
106 | .get_voltage_sel = regulator_get_voltage_sel_regmap, | ||
107 | .set_voltage_sel = regulator_set_voltage_sel_regmap, | ||
108 | .set_voltage_time_sel = max77686_set_dvs_voltage_time_sel, | ||
109 | }; | ||
110 | |||
111 | #define regulator_desc_ldo(num) { \ | ||
112 | .name = "LDO"#num, \ | ||
113 | .id = MAX77686_LDO##num, \ | ||
114 | .ops = &max77686_ops, \ | ||
115 | .type = REGULATOR_VOLTAGE, \ | ||
116 | .owner = THIS_MODULE, \ | ||
117 | .min_uV = MAX77686_LDO_MINUV, \ | ||
118 | .uV_step = MAX77686_LDO_UVSTEP, \ | ||
119 | .n_voltages = MAX77686_VSEL_MASK + 1, \ | ||
120 | .vsel_reg = MAX77686_REG_LDO1CTRL1 + num - 1, \ | ||
121 | .vsel_mask = MAX77686_VSEL_MASK, \ | ||
122 | .enable_reg = MAX77686_REG_LDO1CTRL1 + num - 1, \ | ||
123 | .enable_mask = MAX77686_OPMODE_MASK \ | ||
124 | << MAX77686_OPMODE_SHIFT, \ | ||
125 | } | ||
126 | #define regulator_desc_ldo_low(num) { \ | ||
127 | .name = "LDO"#num, \ | ||
128 | .id = MAX77686_LDO##num, \ | ||
129 | .ops = &max77686_ops, \ | ||
130 | .type = REGULATOR_VOLTAGE, \ | ||
131 | .owner = THIS_MODULE, \ | ||
132 | .min_uV = MAX77686_LDO_LOW_MINUV, \ | ||
133 | .uV_step = MAX77686_LDO_LOW_UVSTEP, \ | ||
134 | .n_voltages = MAX77686_VSEL_MASK + 1, \ | ||
135 | .vsel_reg = MAX77686_REG_LDO1CTRL1 + num - 1, \ | ||
136 | .vsel_mask = MAX77686_VSEL_MASK, \ | ||
137 | .enable_reg = MAX77686_REG_LDO1CTRL1 + num - 1, \ | ||
138 | .enable_mask = MAX77686_OPMODE_MASK \ | ||
139 | << MAX77686_OPMODE_SHIFT, \ | ||
140 | } | ||
141 | #define regulator_desc_buck(num) { \ | ||
142 | .name = "BUCK"#num, \ | ||
143 | .id = MAX77686_BUCK##num, \ | ||
144 | .ops = &max77686_ops, \ | ||
145 | .type = REGULATOR_VOLTAGE, \ | ||
146 | .owner = THIS_MODULE, \ | ||
147 | .min_uV = MAX77686_BUCK_MINUV, \ | ||
148 | .uV_step = MAX77686_BUCK_UVSTEP, \ | ||
149 | .n_voltages = MAX77686_VSEL_MASK + 1, \ | ||
150 | .vsel_reg = MAX77686_REG_BUCK5OUT + (num - 5) * 2, \ | ||
151 | .vsel_mask = MAX77686_VSEL_MASK, \ | ||
152 | .enable_reg = MAX77686_REG_BUCK5CTRL + (num - 5) * 2, \ | ||
153 | .enable_mask = MAX77686_OPMODE_MASK, \ | ||
154 | } | ||
155 | #define regulator_desc_buck1(num) { \ | ||
156 | .name = "BUCK"#num, \ | ||
157 | .id = MAX77686_BUCK##num, \ | ||
158 | .ops = &max77686_ops, \ | ||
159 | .type = REGULATOR_VOLTAGE, \ | ||
160 | .owner = THIS_MODULE, \ | ||
161 | .min_uV = MAX77686_BUCK_MINUV, \ | ||
162 | .uV_step = MAX77686_BUCK_UVSTEP, \ | ||
163 | .n_voltages = MAX77686_VSEL_MASK + 1, \ | ||
164 | .vsel_reg = MAX77686_REG_BUCK1OUT, \ | ||
165 | .vsel_mask = MAX77686_VSEL_MASK, \ | ||
166 | .enable_reg = MAX77686_REG_BUCK1CTRL, \ | ||
167 | .enable_mask = MAX77686_OPMODE_MASK, \ | ||
168 | } | ||
169 | #define regulator_desc_buck_dvs(num) { \ | ||
170 | .name = "BUCK"#num, \ | ||
171 | .id = MAX77686_BUCK##num, \ | ||
172 | .ops = &max77686_buck_dvs_ops, \ | ||
173 | .type = REGULATOR_VOLTAGE, \ | ||
174 | .owner = THIS_MODULE, \ | ||
175 | .min_uV = MAX77686_DVS_MINUV, \ | ||
176 | .uV_step = MAX77686_DVS_UVSTEP, \ | ||
177 | .n_voltages = MAX77686_DVS_VSEL_MASK + 1, \ | ||
178 | .vsel_reg = MAX77686_REG_BUCK2DVS1 + (num - 2) * 10, \ | ||
179 | .vsel_mask = MAX77686_DVS_VSEL_MASK, \ | ||
180 | .enable_reg = MAX77686_REG_BUCK2CTRL1 + (num - 2) * 10, \ | ||
181 | .enable_mask = MAX77686_OPMODE_MASK \ | ||
182 | << MAX77686_OPMODE_BUCK234_SHIFT, \ | ||
183 | } | ||
184 | |||
185 | static struct regulator_desc regulators[] = { | ||
186 | regulator_desc_ldo_low(1), | ||
187 | regulator_desc_ldo_low(2), | ||
188 | regulator_desc_ldo(3), | ||
189 | regulator_desc_ldo(4), | ||
190 | regulator_desc_ldo(5), | ||
191 | regulator_desc_ldo_low(6), | ||
192 | regulator_desc_ldo_low(7), | ||
193 | regulator_desc_ldo_low(8), | ||
194 | regulator_desc_ldo(9), | ||
195 | regulator_desc_ldo(10), | ||
196 | regulator_desc_ldo(11), | ||
197 | regulator_desc_ldo(12), | ||
198 | regulator_desc_ldo(13), | ||
199 | regulator_desc_ldo(14), | ||
200 | regulator_desc_ldo_low(15), | ||
201 | regulator_desc_ldo(16), | ||
202 | regulator_desc_ldo(17), | ||
203 | regulator_desc_ldo(18), | ||
204 | regulator_desc_ldo(19), | ||
205 | regulator_desc_ldo(20), | ||
206 | regulator_desc_ldo(21), | ||
207 | regulator_desc_ldo(22), | ||
208 | regulator_desc_ldo(23), | ||
209 | regulator_desc_ldo(24), | ||
210 | regulator_desc_ldo(25), | ||
211 | regulator_desc_ldo(26), | ||
212 | regulator_desc_buck1(1), | ||
213 | regulator_desc_buck_dvs(2), | ||
214 | regulator_desc_buck_dvs(3), | ||
215 | regulator_desc_buck_dvs(4), | ||
216 | regulator_desc_buck(5), | ||
217 | regulator_desc_buck(6), | ||
218 | regulator_desc_buck(7), | ||
219 | regulator_desc_buck(8), | ||
220 | regulator_desc_buck(9), | ||
221 | }; | ||
222 | |||
223 | static __devinit int max77686_pmic_probe(struct platform_device *pdev) | ||
224 | { | ||
225 | struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent); | ||
226 | struct max77686_platform_data *pdata = dev_get_platdata(iodev->dev); | ||
227 | struct regulator_dev **rdev; | ||
228 | struct max77686_data *max77686; | ||
229 | int i, size; | ||
230 | int ret = 0; | ||
231 | struct regulator_config config; | ||
232 | |||
233 | dev_dbg(&pdev->dev, "%s\n", __func__); | ||
234 | |||
235 | max77686 = devm_kzalloc(&pdev->dev, sizeof(struct max77686_data), | ||
236 | GFP_KERNEL); | ||
237 | if (!max77686) | ||
238 | return -ENOMEM; | ||
239 | |||
240 | size = sizeof(struct regulator_dev *) * MAX77686_REGULATORS; | ||
241 | max77686->rdev = devm_kzalloc(&pdev->dev, size, GFP_KERNEL); | ||
242 | if (!max77686->rdev) | ||
243 | return -ENOMEM; | ||
244 | |||
245 | rdev = max77686->rdev; | ||
246 | max77686->dev = &pdev->dev; | ||
247 | max77686->iodev = iodev; | ||
248 | if (pdata) | ||
249 | max77686->num_regulators = pdata->num_regulators; | ||
250 | platform_set_drvdata(pdev, max77686); | ||
251 | |||
252 | max77686->ramp_delay = RAMP_RATE_NO_CTRL; /* Set 0x3 for RAMP */ | ||
253 | regmap_update_bits(max77686->iodev->regmap, | ||
254 | MAX77686_REG_BUCK2CTRL1, MAX77686_RAMP_RATE_MASK, | ||
255 | max77686->ramp_delay << 6); | ||
256 | regmap_update_bits(max77686->iodev->regmap, | ||
257 | MAX77686_REG_BUCK3CTRL1, MAX77686_RAMP_RATE_MASK, | ||
258 | max77686->ramp_delay << 6); | ||
259 | regmap_update_bits(max77686->iodev->regmap, | ||
260 | MAX77686_REG_BUCK4CTRL1, MAX77686_RAMP_RATE_MASK, | ||
261 | max77686->ramp_delay << 6); | ||
262 | |||
263 | if (pdata->num_regulators == MAX77686_REGULATORS) { | ||
264 | for (i = 0; i < MAX77686_REGULATORS; i++) { | ||
265 | config.dev = max77686->dev; | ||
266 | config.regmap = iodev->regmap; | ||
267 | config.driver_data = max77686; | ||
268 | config.init_data = pdata->regulators[i].initdata; | ||
269 | |||
270 | rdev[i] = regulator_register(®ulators[i], &config); | ||
271 | |||
272 | if (IS_ERR(rdev[i])) { | ||
273 | ret = PTR_ERR(rdev[i]); | ||
274 | dev_err(max77686->dev, | ||
275 | "regulator init failed for %d\n", i); | ||
276 | rdev[i] = NULL; | ||
277 | goto err; | ||
278 | } | ||
279 | } | ||
280 | } else { | ||
281 | dev_err(max77686->dev, | ||
282 | "Lack of initial data for regulator's initialiation\n"); | ||
283 | return -EINVAL; | ||
284 | } | ||
285 | return 0; | ||
286 | err: | ||
287 | for (i = 0; i < MAX77686_REGULATORS; i++) { | ||
288 | if (rdev[i]) | ||
289 | regulator_unregister(rdev[i]); | ||
290 | } | ||
291 | return ret; | ||
292 | } | ||
293 | |||
294 | static int __devexit max77686_pmic_remove(struct platform_device *pdev) | ||
295 | { | ||
296 | struct max77686_data *max77686 = platform_get_drvdata(pdev); | ||
297 | struct regulator_dev **rdev = max77686->rdev; | ||
298 | int i; | ||
299 | |||
300 | for (i = 0; i < MAX77686_REGULATORS; i++) | ||
301 | if (rdev[i]) | ||
302 | regulator_unregister(rdev[i]); | ||
303 | |||
304 | return 0; | ||
305 | } | ||
306 | |||
307 | static const struct platform_device_id max77686_pmic_id[] = { | ||
308 | {"max77686-pmic", 0}, | ||
309 | { }, | ||
310 | }; | ||
311 | MODULE_DEVICE_TABLE(platform, max77686_pmic_id); | ||
312 | |||
313 | static struct platform_driver max77686_pmic_driver = { | ||
314 | .driver = { | ||
315 | .name = "max77686-pmic", | ||
316 | .owner = THIS_MODULE, | ||
317 | }, | ||
318 | .probe = max77686_pmic_probe, | ||
319 | .remove = __devexit_p(max77686_pmic_remove), | ||
320 | .id_table = max77686_pmic_id, | ||
321 | }; | ||
322 | |||
323 | static int __init max77686_pmic_init(void) | ||
324 | { | ||
325 | return platform_driver_register(&max77686_pmic_driver); | ||
326 | } | ||
327 | subsys_initcall(max77686_pmic_init); | ||
328 | |||
329 | static void __exit max77686_pmic_cleanup(void) | ||
330 | { | ||
331 | platform_driver_unregister(&max77686_pmic_driver); | ||
332 | } | ||
333 | module_exit(max77686_pmic_cleanup); | ||
334 | |||
335 | MODULE_DESCRIPTION("MAXIM 77686 Regulator Driver"); | ||
336 | MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>"); | ||
337 | MODULE_LICENSE("GPL"); | ||