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authorJonathan Herman <hermanjl@cs.unc.edu>2013-01-17 16:15:55 -0500
committerJonathan Herman <hermanjl@cs.unc.edu>2013-01-17 16:15:55 -0500
commit8dea78da5cee153b8af9c07a2745f6c55057fe12 (patch)
treea8f4d49d63b1ecc92f2fddceba0655b2472c5bd9 /drivers/regulator/max8925-regulator.c
parent406089d01562f1e2bf9f089fd7637009ebaad589 (diff)
Patched in Tegra support.
Diffstat (limited to 'drivers/regulator/max8925-regulator.c')
-rw-r--r--drivers/regulator/max8925-regulator.c216
1 files changed, 85 insertions, 131 deletions
diff --git a/drivers/regulator/max8925-regulator.c b/drivers/regulator/max8925-regulator.c
index 446a8544555..e4dbd667c04 100644
--- a/drivers/regulator/max8925-regulator.c
+++ b/drivers/regulator/max8925-regulator.c
@@ -9,7 +9,6 @@
9 * published by the Free Software Foundation. 9 * published by the Free Software Foundation.
10 */ 10 */
11#include <linux/kernel.h> 11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/init.h> 12#include <linux/init.h>
14#include <linux/err.h> 13#include <linux/err.h>
15#include <linux/i2c.h> 14#include <linux/i2c.h>
@@ -17,8 +16,6 @@
17#include <linux/regulator/driver.h> 16#include <linux/regulator/driver.h>
18#include <linux/regulator/machine.h> 17#include <linux/regulator/machine.h>
19#include <linux/mfd/max8925.h> 18#include <linux/mfd/max8925.h>
20#include <linux/of.h>
21#include <linux/regulator/of_regulator.h>
22 19
23#define SD1_DVM_VMIN 850000 20#define SD1_DVM_VMIN 850000
24#define SD1_DVM_VMAX 1000000 21#define SD1_DVM_VMAX 1000000
@@ -26,13 +23,9 @@
26#define SD1_DVM_SHIFT 5 /* SDCTL1 bit5 */ 23#define SD1_DVM_SHIFT 5 /* SDCTL1 bit5 */
27#define SD1_DVM_EN 6 /* SDV1 bit 6 */ 24#define SD1_DVM_EN 6 /* SDV1 bit 6 */
28 25
29/* bit definitions in LDO control registers */ 26/* bit definitions in SD & LDO control registers */
30#define LDO_SEQ_I2C 0x7 /* Power U/D by i2c */ 27#define OUT_ENABLE 0x1f /* Power U/D sequence as I2C */
31#define LDO_SEQ_MASK 0x7 /* Power U/D sequence mask */ 28#define OUT_DISABLE 0x1e /* Power U/D sequence as I2C */
32#define LDO_SEQ_SHIFT 2 /* Power U/D sequence offset */
33#define LDO_I2C_EN 0x1 /* Enable by i2c */
34#define LDO_I2C_EN_MASK 0x1 /* Enable mask by i2c */
35#define LDO_I2C_EN_SHIFT 0 /* Enable offset by i2c */
36 29
37struct max8925_regulator_info { 30struct max8925_regulator_info {
38 struct regulator_desc desc; 31 struct regulator_desc desc;
@@ -40,20 +33,51 @@ struct max8925_regulator_info {
40 struct i2c_client *i2c; 33 struct i2c_client *i2c;
41 struct max8925_chip *chip; 34 struct max8925_chip *chip;
42 35
36 int min_uV;
37 int max_uV;
38 int step_uV;
43 int vol_reg; 39 int vol_reg;
40 int vol_shift;
41 int vol_nbits;
42 int enable_bit;
44 int enable_reg; 43 int enable_reg;
45}; 44};
46 45
47static int max8925_set_voltage_sel(struct regulator_dev *rdev, 46static inline int check_range(struct max8925_regulator_info *info,
48 unsigned int selector) 47 int min_uV, int max_uV)
48{
49 if (min_uV < info->min_uV || min_uV > info->max_uV)
50 return -EINVAL;
51
52 return 0;
53}
54
55static int max8925_list_voltage(struct regulator_dev *rdev, unsigned index)
49{ 56{
50 struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 57 struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
51 unsigned char mask = rdev->desc->n_voltages - 1; 58 return info->min_uV + index * info->step_uV;
59}
52 60
53 return max8925_set_bits(info->i2c, info->vol_reg, mask, selector); 61static int max8925_set_voltage(struct regulator_dev *rdev,
62 int min_uV, int max_uV, unsigned int *selector)
63{
64 struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
65 unsigned char data, mask;
66
67 if (check_range(info, min_uV, max_uV)) {
68 dev_err(info->chip->dev, "invalid voltage range (%d, %d) uV\n",
69 min_uV, max_uV);
70 return -EINVAL;
71 }
72 data = (min_uV - info->min_uV + info->step_uV - 1) / info->step_uV;
73 *selector = data;
74 data <<= info->vol_shift;
75 mask = ((1 << info->vol_nbits) - 1) << info->vol_shift;
76
77 return max8925_set_bits(info->i2c, info->vol_reg, mask, data);
54} 78}
55 79
56static int max8925_get_voltage_sel(struct regulator_dev *rdev) 80static int max8925_get_voltage(struct regulator_dev *rdev)
57{ 81{
58 struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 82 struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
59 unsigned char data, mask; 83 unsigned char data, mask;
@@ -62,10 +86,10 @@ static int max8925_get_voltage_sel(struct regulator_dev *rdev)
62 ret = max8925_reg_read(info->i2c, info->vol_reg); 86 ret = max8925_reg_read(info->i2c, info->vol_reg);
63 if (ret < 0) 87 if (ret < 0)
64 return ret; 88 return ret;
65 mask = rdev->desc->n_voltages - 1; 89 mask = ((1 << info->vol_nbits) - 1) << info->vol_shift;
66 data = ret & mask; 90 data = (ret & mask) >> info->vol_shift;
67 91
68 return data; 92 return max8925_list_voltage(rdev, data);
69} 93}
70 94
71static int max8925_enable(struct regulator_dev *rdev) 95static int max8925_enable(struct regulator_dev *rdev)
@@ -73,10 +97,8 @@ static int max8925_enable(struct regulator_dev *rdev)
73 struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 97 struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
74 98
75 return max8925_set_bits(info->i2c, info->enable_reg, 99 return max8925_set_bits(info->i2c, info->enable_reg,
76 LDO_SEQ_MASK << LDO_SEQ_SHIFT | 100 OUT_ENABLE << info->enable_bit,
77 LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT, 101 OUT_ENABLE << info->enable_bit);
78 LDO_SEQ_I2C << LDO_SEQ_SHIFT |
79 LDO_I2C_EN << LDO_I2C_EN_SHIFT);
80} 102}
81 103
82static int max8925_disable(struct regulator_dev *rdev) 104static int max8925_disable(struct regulator_dev *rdev)
@@ -84,24 +106,20 @@ static int max8925_disable(struct regulator_dev *rdev)
84 struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 106 struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
85 107
86 return max8925_set_bits(info->i2c, info->enable_reg, 108 return max8925_set_bits(info->i2c, info->enable_reg,
87 LDO_SEQ_MASK << LDO_SEQ_SHIFT | 109 OUT_ENABLE << info->enable_bit,
88 LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT, 110 OUT_DISABLE << info->enable_bit);
89 LDO_SEQ_I2C << LDO_SEQ_SHIFT);
90} 111}
91 112
92static int max8925_is_enabled(struct regulator_dev *rdev) 113static int max8925_is_enabled(struct regulator_dev *rdev)
93{ 114{
94 struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 115 struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
95 int ldo_seq, ret; 116 int ret;
96 117
97 ret = max8925_reg_read(info->i2c, info->enable_reg); 118 ret = max8925_reg_read(info->i2c, info->enable_reg);
98 if (ret < 0) 119 if (ret < 0)
99 return ret; 120 return ret;
100 ldo_seq = (ret >> LDO_SEQ_SHIFT) & LDO_SEQ_MASK; 121
101 if (ldo_seq != LDO_SEQ_I2C) 122 return ret & (1 << info->enable_bit);
102 return 1;
103 else
104 return ret & (LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT);
105} 123}
106 124
107static int max8925_set_dvm_voltage(struct regulator_dev *rdev, int uV) 125static int max8925_set_dvm_voltage(struct regulator_dev *rdev, int uV)
@@ -112,7 +130,7 @@ static int max8925_set_dvm_voltage(struct regulator_dev *rdev, int uV)
112 if (uV < SD1_DVM_VMIN || uV > SD1_DVM_VMAX) 130 if (uV < SD1_DVM_VMIN || uV > SD1_DVM_VMAX)
113 return -EINVAL; 131 return -EINVAL;
114 132
115 data = DIV_ROUND_UP(uV - SD1_DVM_VMIN, SD1_DVM_STEP); 133 data = (uV - SD1_DVM_VMIN + SD1_DVM_STEP - 1) / SD1_DVM_STEP;
116 data <<= SD1_DVM_SHIFT; 134 data <<= SD1_DVM_SHIFT;
117 mask = 3 << SD1_DVM_SHIFT; 135 mask = 3 << SD1_DVM_SHIFT;
118 136
@@ -135,10 +153,8 @@ static int max8925_set_dvm_disable(struct regulator_dev *rdev)
135} 153}
136 154
137static struct regulator_ops max8925_regulator_sdv_ops = { 155static struct regulator_ops max8925_regulator_sdv_ops = {
138 .map_voltage = regulator_map_voltage_linear, 156 .set_voltage = max8925_set_voltage,
139 .list_voltage = regulator_list_voltage_linear, 157 .get_voltage = max8925_get_voltage,
140 .set_voltage_sel = max8925_set_voltage_sel,
141 .get_voltage_sel = max8925_get_voltage_sel,
142 .enable = max8925_enable, 158 .enable = max8925_enable,
143 .disable = max8925_disable, 159 .disable = max8925_disable,
144 .is_enabled = max8925_is_enabled, 160 .is_enabled = max8925_is_enabled,
@@ -148,10 +164,8 @@ static struct regulator_ops max8925_regulator_sdv_ops = {
148}; 164};
149 165
150static struct regulator_ops max8925_regulator_ldo_ops = { 166static struct regulator_ops max8925_regulator_ldo_ops = {
151 .map_voltage = regulator_map_voltage_linear, 167 .set_voltage = max8925_set_voltage,
152 .list_voltage = regulator_list_voltage_linear, 168 .get_voltage = max8925_get_voltage,
153 .set_voltage_sel = max8925_set_voltage_sel,
154 .get_voltage_sel = max8925_get_voltage_sel,
155 .enable = max8925_enable, 169 .enable = max8925_enable,
156 .disable = max8925_disable, 170 .disable = max8925_disable,
157 .is_enabled = max8925_is_enabled, 171 .is_enabled = max8925_is_enabled,
@@ -165,12 +179,15 @@ static struct regulator_ops max8925_regulator_ldo_ops = {
165 .type = REGULATOR_VOLTAGE, \ 179 .type = REGULATOR_VOLTAGE, \
166 .id = MAX8925_ID_SD##_id, \ 180 .id = MAX8925_ID_SD##_id, \
167 .owner = THIS_MODULE, \ 181 .owner = THIS_MODULE, \
168 .n_voltages = 64, \
169 .min_uV = min * 1000, \
170 .uV_step = step * 1000, \
171 }, \ 182 }, \
183 .min_uV = min * 1000, \
184 .max_uV = max * 1000, \
185 .step_uV = step * 1000, \
172 .vol_reg = MAX8925_SDV##_id, \ 186 .vol_reg = MAX8925_SDV##_id, \
187 .vol_shift = 0, \
188 .vol_nbits = 6, \
173 .enable_reg = MAX8925_SDCTL##_id, \ 189 .enable_reg = MAX8925_SDCTL##_id, \
190 .enable_bit = 0, \
174} 191}
175 192
176#define MAX8925_LDO(_id, min, max, step) \ 193#define MAX8925_LDO(_id, min, max, step) \
@@ -181,42 +198,17 @@ static struct regulator_ops max8925_regulator_ldo_ops = {
181 .type = REGULATOR_VOLTAGE, \ 198 .type = REGULATOR_VOLTAGE, \
182 .id = MAX8925_ID_LDO##_id, \ 199 .id = MAX8925_ID_LDO##_id, \
183 .owner = THIS_MODULE, \ 200 .owner = THIS_MODULE, \
184 .n_voltages = 64, \
185 .min_uV = min * 1000, \
186 .uV_step = step * 1000, \
187 }, \ 201 }, \
202 .min_uV = min * 1000, \
203 .max_uV = max * 1000, \
204 .step_uV = step * 1000, \
188 .vol_reg = MAX8925_LDOVOUT##_id, \ 205 .vol_reg = MAX8925_LDOVOUT##_id, \
206 .vol_shift = 0, \
207 .vol_nbits = 6, \
189 .enable_reg = MAX8925_LDOCTL##_id, \ 208 .enable_reg = MAX8925_LDOCTL##_id, \
209 .enable_bit = 0, \
190} 210}
191 211
192#ifdef CONFIG_OF
193static struct of_regulator_match max8925_regulator_matches[] = {
194 { .name = "SDV1",},
195 { .name = "SDV2",},
196 { .name = "SDV3",},
197 { .name = "LDO1",},
198 { .name = "LDO2",},
199 { .name = "LDO3",},
200 { .name = "LDO4",},
201 { .name = "LDO5",},
202 { .name = "LDO6",},
203 { .name = "LDO7",},
204 { .name = "LDO8",},
205 { .name = "LDO9",},
206 { .name = "LDO10",},
207 { .name = "LDO11",},
208 { .name = "LDO12",},
209 { .name = "LDO13",},
210 { .name = "LDO14",},
211 { .name = "LDO15",},
212 { .name = "LDO16",},
213 { .name = "LDO17",},
214 { .name = "LDO18",},
215 { .name = "LDO19",},
216 { .name = "LDO20",},
217};
218#endif
219
220static struct max8925_regulator_info max8925_regulator_info[] = { 212static struct max8925_regulator_info max8925_regulator_info[] = {
221 MAX8925_SDV(1, 637.5, 1425, 12.5), 213 MAX8925_SDV(1, 637.5, 1425, 12.5),
222 MAX8925_SDV(2, 650, 2225, 25), 214 MAX8925_SDV(2, 650, 2225, 25),
@@ -244,75 +236,36 @@ static struct max8925_regulator_info max8925_regulator_info[] = {
244 MAX8925_LDO(20, 750, 3900, 50), 236 MAX8925_LDO(20, 750, 3900, 50),
245}; 237};
246 238
247#ifdef CONFIG_OF 239static struct max8925_regulator_info * __devinit find_regulator_info(int id)
248static int max8925_regulator_dt_init(struct platform_device *pdev,
249 struct max8925_regulator_info *info,
250 struct regulator_config *config,
251 int ridx)
252{ 240{
253 struct device_node *nproot, *np; 241 struct max8925_regulator_info *ri;
254 int rcount; 242 int i;
255 nproot = pdev->dev.parent->of_node;
256 if (!nproot)
257 return -ENODEV;
258 np = of_find_node_by_name(nproot, "regulators");
259 if (!np) {
260 dev_err(&pdev->dev, "failed to find regulators node\n");
261 return -ENODEV;
262 }
263
264 rcount = of_regulator_match(&pdev->dev, np,
265 &max8925_regulator_matches[ridx], 1);
266 if (rcount < 0)
267 return -ENODEV;
268 config->init_data = max8925_regulator_matches[ridx].init_data;
269 config->of_node = max8925_regulator_matches[ridx].of_node;
270 243
271 return 0; 244 for (i = 0; i < ARRAY_SIZE(max8925_regulator_info); i++) {
245 ri = &max8925_regulator_info[i];
246 if (ri->desc.id == id)
247 return ri;
248 }
249 return NULL;
272} 250}
273#else
274#define max8925_regulator_dt_init(w, x, y, z) (-1)
275#endif
276 251
277static int max8925_regulator_probe(struct platform_device *pdev) 252static int __devinit max8925_regulator_probe(struct platform_device *pdev)
278{ 253{
279 struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); 254 struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
280 struct regulator_init_data *pdata = pdev->dev.platform_data; 255 struct max8925_platform_data *pdata = chip->dev->platform_data;
281 struct regulator_config config = { };
282 struct max8925_regulator_info *ri; 256 struct max8925_regulator_info *ri;
283 struct resource *res;
284 struct regulator_dev *rdev; 257 struct regulator_dev *rdev;
285 int i, regulator_idx;
286 258
287 res = platform_get_resource(pdev, IORESOURCE_REG, 0); 259 ri = find_regulator_info(pdev->id);
288 if (!res) { 260 if (ri == NULL) {
289 dev_err(&pdev->dev, "No REG resource!\n"); 261 dev_err(&pdev->dev, "invalid regulator ID specified\n");
290 return -EINVAL;
291 }
292 for (i = 0; i < ARRAY_SIZE(max8925_regulator_info); i++) {
293 ri = &max8925_regulator_info[i];
294 if (ri->vol_reg == res->start) {
295 regulator_idx = i;
296 break;
297 }
298 }
299
300 if (i == ARRAY_SIZE(max8925_regulator_info)) {
301 dev_err(&pdev->dev, "Failed to find regulator %llu\n",
302 (unsigned long long)res->start);
303 return -EINVAL; 262 return -EINVAL;
304 } 263 }
305 ri->i2c = chip->i2c; 264 ri->i2c = chip->i2c;
306 ri->chip = chip; 265 ri->chip = chip;
307 266
308 config.dev = &pdev->dev; 267 rdev = regulator_register(&ri->desc, &pdev->dev,
309 config.driver_data = ri; 268 pdata->regulator[pdev->id], ri);
310
311 if (max8925_regulator_dt_init(pdev, ri, &config, regulator_idx))
312 if (pdata)
313 config.init_data = pdata;
314
315 rdev = regulator_register(&ri->desc, &config);
316 if (IS_ERR(rdev)) { 269 if (IS_ERR(rdev)) {
317 dev_err(&pdev->dev, "failed to register regulator %s\n", 270 dev_err(&pdev->dev, "failed to register regulator %s\n",
318 ri->desc.name); 271 ri->desc.name);
@@ -323,7 +276,7 @@ static int max8925_regulator_probe(struct platform_device *pdev)
323 return 0; 276 return 0;
324} 277}
325 278
326static int max8925_regulator_remove(struct platform_device *pdev) 279static int __devexit max8925_regulator_remove(struct platform_device *pdev)
327{ 280{
328 struct regulator_dev *rdev = platform_get_drvdata(pdev); 281 struct regulator_dev *rdev = platform_get_drvdata(pdev);
329 282
@@ -339,7 +292,7 @@ static struct platform_driver max8925_regulator_driver = {
339 .owner = THIS_MODULE, 292 .owner = THIS_MODULE,
340 }, 293 },
341 .probe = max8925_regulator_probe, 294 .probe = max8925_regulator_probe,
342 .remove = max8925_regulator_remove, 295 .remove = __devexit_p(max8925_regulator_remove),
343}; 296};
344 297
345static int __init max8925_regulator_init(void) 298static int __init max8925_regulator_init(void)
@@ -358,3 +311,4 @@ MODULE_LICENSE("GPL");
358MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); 311MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
359MODULE_DESCRIPTION("Regulator Driver for Maxim 8925 PMIC"); 312MODULE_DESCRIPTION("Regulator Driver for Maxim 8925 PMIC");
360MODULE_ALIAS("platform:max8925-regulator"); 313MODULE_ALIAS("platform:max8925-regulator");
314
generated by cgit v1.2.2 (git 2.25.0) at 2025-03-22 15:31:27 -0400