Merge tag 'for-linus-5.4-rc5-tag' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6-microblaze.git] / drivers / regulator / slg51000-regulator.c
1 // SPDX-License-Identifier: GPL-2.0+
2 //
3 // SLG51000 High PSRR, Multi-Output Regulators
4 // Copyright (C) 2019  Dialog Semiconductor
5 //
6 // Author: Eric Jeong <eric.jeong.opensource@diasemi.com>
7
8 #include <linux/err.h>
9 #include <linux/gpio/consumer.h>
10 #include <linux/i2c.h>
11 #include <linux/init.h>
12 #include <linux/interrupt.h>
13 #include <linux/irq.h>
14 #include <linux/module.h>
15 #include <linux/of.h>
16 #include <linux/regmap.h>
17 #include <linux/regulator/driver.h>
18 #include <linux/regulator/machine.h>
19 #include <linux/regulator/of_regulator.h>
20 #include "slg51000-regulator.h"
21
22 #define SLG51000_SCTL_EVT               7
23 #define SLG51000_MAX_EVT_REGISTER       8
24 #define SLG51000_LDOHP_LV_MIN           1200000
25 #define SLG51000_LDOHP_HV_MIN           2400000
26
27 enum slg51000_regulators {
28         SLG51000_REGULATOR_LDO1 = 0,
29         SLG51000_REGULATOR_LDO2,
30         SLG51000_REGULATOR_LDO3,
31         SLG51000_REGULATOR_LDO4,
32         SLG51000_REGULATOR_LDO5,
33         SLG51000_REGULATOR_LDO6,
34         SLG51000_REGULATOR_LDO7,
35         SLG51000_MAX_REGULATORS,
36 };
37
38 struct slg51000 {
39         struct device *dev;
40         struct regmap *regmap;
41         struct regulator_desc *rdesc[SLG51000_MAX_REGULATORS];
42         struct regulator_dev *rdev[SLG51000_MAX_REGULATORS];
43         struct gpio_desc *cs_gpiod;
44         int chip_irq;
45 };
46
47 struct slg51000_evt_sta {
48         unsigned int ereg;
49         unsigned int sreg;
50 };
51
52 static const struct slg51000_evt_sta es_reg[SLG51000_MAX_EVT_REGISTER] = {
53         {SLG51000_LDO1_EVENT, SLG51000_LDO1_STATUS},
54         {SLG51000_LDO2_EVENT, SLG51000_LDO2_STATUS},
55         {SLG51000_LDO3_EVENT, SLG51000_LDO3_STATUS},
56         {SLG51000_LDO4_EVENT, SLG51000_LDO4_STATUS},
57         {SLG51000_LDO5_EVENT, SLG51000_LDO5_STATUS},
58         {SLG51000_LDO6_EVENT, SLG51000_LDO6_STATUS},
59         {SLG51000_LDO7_EVENT, SLG51000_LDO7_STATUS},
60         {SLG51000_SYSCTL_EVENT, SLG51000_SYSCTL_STATUS},
61 };
62
63 static const struct regmap_range slg51000_writeable_ranges[] = {
64         regmap_reg_range(SLG51000_SYSCTL_MATRIX_CONF_A,
65                          SLG51000_SYSCTL_MATRIX_CONF_A),
66         regmap_reg_range(SLG51000_LDO1_VSEL, SLG51000_LDO1_VSEL),
67         regmap_reg_range(SLG51000_LDO1_MINV, SLG51000_LDO1_MAXV),
68         regmap_reg_range(SLG51000_LDO1_IRQ_MASK, SLG51000_LDO1_IRQ_MASK),
69         regmap_reg_range(SLG51000_LDO2_VSEL, SLG51000_LDO2_VSEL),
70         regmap_reg_range(SLG51000_LDO2_MINV, SLG51000_LDO2_MAXV),
71         regmap_reg_range(SLG51000_LDO2_IRQ_MASK, SLG51000_LDO2_IRQ_MASK),
72         regmap_reg_range(SLG51000_LDO3_VSEL, SLG51000_LDO3_VSEL),
73         regmap_reg_range(SLG51000_LDO3_MINV, SLG51000_LDO3_MAXV),
74         regmap_reg_range(SLG51000_LDO3_IRQ_MASK, SLG51000_LDO3_IRQ_MASK),
75         regmap_reg_range(SLG51000_LDO4_VSEL, SLG51000_LDO4_VSEL),
76         regmap_reg_range(SLG51000_LDO4_MINV, SLG51000_LDO4_MAXV),
77         regmap_reg_range(SLG51000_LDO4_IRQ_MASK, SLG51000_LDO4_IRQ_MASK),
78         regmap_reg_range(SLG51000_LDO5_VSEL, SLG51000_LDO5_VSEL),
79         regmap_reg_range(SLG51000_LDO5_MINV, SLG51000_LDO5_MAXV),
80         regmap_reg_range(SLG51000_LDO5_IRQ_MASK, SLG51000_LDO5_IRQ_MASK),
81         regmap_reg_range(SLG51000_LDO6_VSEL, SLG51000_LDO6_VSEL),
82         regmap_reg_range(SLG51000_LDO6_MINV, SLG51000_LDO6_MAXV),
83         regmap_reg_range(SLG51000_LDO6_IRQ_MASK, SLG51000_LDO6_IRQ_MASK),
84         regmap_reg_range(SLG51000_LDO7_VSEL, SLG51000_LDO7_VSEL),
85         regmap_reg_range(SLG51000_LDO7_MINV, SLG51000_LDO7_MAXV),
86         regmap_reg_range(SLG51000_LDO7_IRQ_MASK, SLG51000_LDO7_IRQ_MASK),
87         regmap_reg_range(SLG51000_OTP_IRQ_MASK, SLG51000_OTP_IRQ_MASK),
88 };
89
90 static const struct regmap_range slg51000_readable_ranges[] = {
91         regmap_reg_range(SLG51000_SYSCTL_PATN_ID_B0,
92                          SLG51000_SYSCTL_PATN_ID_B2),
93         regmap_reg_range(SLG51000_SYSCTL_SYS_CONF_A,
94                          SLG51000_SYSCTL_SYS_CONF_A),
95         regmap_reg_range(SLG51000_SYSCTL_SYS_CONF_D,
96                          SLG51000_SYSCTL_MATRIX_CONF_B),
97         regmap_reg_range(SLG51000_SYSCTL_REFGEN_CONF_C,
98                          SLG51000_SYSCTL_UVLO_CONF_A),
99         regmap_reg_range(SLG51000_SYSCTL_FAULT_LOG1, SLG51000_SYSCTL_IRQ_MASK),
100         regmap_reg_range(SLG51000_IO_GPIO1_CONF, SLG51000_IO_GPIO_STATUS),
101         regmap_reg_range(SLG51000_LUTARRAY_LUT_VAL_0,
102                          SLG51000_LUTARRAY_LUT_VAL_11),
103         regmap_reg_range(SLG51000_MUXARRAY_INPUT_SEL_0,
104                          SLG51000_MUXARRAY_INPUT_SEL_63),
105         regmap_reg_range(SLG51000_PWRSEQ_RESOURCE_EN_0,
106                          SLG51000_PWRSEQ_INPUT_SENSE_CONF_B),
107         regmap_reg_range(SLG51000_LDO1_VSEL, SLG51000_LDO1_VSEL),
108         regmap_reg_range(SLG51000_LDO1_MINV, SLG51000_LDO1_MAXV),
109         regmap_reg_range(SLG51000_LDO1_MISC1, SLG51000_LDO1_VSEL_ACTUAL),
110         regmap_reg_range(SLG51000_LDO1_EVENT, SLG51000_LDO1_IRQ_MASK),
111         regmap_reg_range(SLG51000_LDO2_VSEL, SLG51000_LDO2_VSEL),
112         regmap_reg_range(SLG51000_LDO2_MINV, SLG51000_LDO2_MAXV),
113         regmap_reg_range(SLG51000_LDO2_MISC1, SLG51000_LDO2_VSEL_ACTUAL),
114         regmap_reg_range(SLG51000_LDO2_EVENT, SLG51000_LDO2_IRQ_MASK),
115         regmap_reg_range(SLG51000_LDO3_VSEL, SLG51000_LDO3_VSEL),
116         regmap_reg_range(SLG51000_LDO3_MINV, SLG51000_LDO3_MAXV),
117         regmap_reg_range(SLG51000_LDO3_CONF1, SLG51000_LDO3_VSEL_ACTUAL),
118         regmap_reg_range(SLG51000_LDO3_EVENT, SLG51000_LDO3_IRQ_MASK),
119         regmap_reg_range(SLG51000_LDO4_VSEL, SLG51000_LDO4_VSEL),
120         regmap_reg_range(SLG51000_LDO4_MINV, SLG51000_LDO4_MAXV),
121         regmap_reg_range(SLG51000_LDO4_CONF1, SLG51000_LDO4_VSEL_ACTUAL),
122         regmap_reg_range(SLG51000_LDO4_EVENT, SLG51000_LDO4_IRQ_MASK),
123         regmap_reg_range(SLG51000_LDO5_VSEL, SLG51000_LDO5_VSEL),
124         regmap_reg_range(SLG51000_LDO5_MINV, SLG51000_LDO5_MAXV),
125         regmap_reg_range(SLG51000_LDO5_TRIM2, SLG51000_LDO5_TRIM2),
126         regmap_reg_range(SLG51000_LDO5_CONF1, SLG51000_LDO5_VSEL_ACTUAL),
127         regmap_reg_range(SLG51000_LDO5_EVENT, SLG51000_LDO5_IRQ_MASK),
128         regmap_reg_range(SLG51000_LDO6_VSEL, SLG51000_LDO6_VSEL),
129         regmap_reg_range(SLG51000_LDO6_MINV, SLG51000_LDO6_MAXV),
130         regmap_reg_range(SLG51000_LDO6_TRIM2, SLG51000_LDO6_TRIM2),
131         regmap_reg_range(SLG51000_LDO6_CONF1, SLG51000_LDO6_VSEL_ACTUAL),
132         regmap_reg_range(SLG51000_LDO6_EVENT, SLG51000_LDO6_IRQ_MASK),
133         regmap_reg_range(SLG51000_LDO7_VSEL, SLG51000_LDO7_VSEL),
134         regmap_reg_range(SLG51000_LDO7_MINV, SLG51000_LDO7_MAXV),
135         regmap_reg_range(SLG51000_LDO7_CONF1, SLG51000_LDO7_VSEL_ACTUAL),
136         regmap_reg_range(SLG51000_LDO7_EVENT, SLG51000_LDO7_IRQ_MASK),
137         regmap_reg_range(SLG51000_OTP_EVENT, SLG51000_OTP_EVENT),
138         regmap_reg_range(SLG51000_OTP_IRQ_MASK, SLG51000_OTP_IRQ_MASK),
139         regmap_reg_range(SLG51000_OTP_LOCK_OTP_PROG, SLG51000_OTP_LOCK_CTRL),
140         regmap_reg_range(SLG51000_LOCK_GLOBAL_LOCK_CTRL1,
141                          SLG51000_LOCK_GLOBAL_LOCK_CTRL1),
142 };
143
144 static const struct regmap_range slg51000_volatile_ranges[] = {
145         regmap_reg_range(SLG51000_SYSCTL_FAULT_LOG1, SLG51000_SYSCTL_STATUS),
146         regmap_reg_range(SLG51000_IO_GPIO_STATUS, SLG51000_IO_GPIO_STATUS),
147         regmap_reg_range(SLG51000_LDO1_EVENT, SLG51000_LDO1_STATUS),
148         regmap_reg_range(SLG51000_LDO2_EVENT, SLG51000_LDO2_STATUS),
149         regmap_reg_range(SLG51000_LDO3_EVENT, SLG51000_LDO3_STATUS),
150         regmap_reg_range(SLG51000_LDO4_EVENT, SLG51000_LDO4_STATUS),
151         regmap_reg_range(SLG51000_LDO5_EVENT, SLG51000_LDO5_STATUS),
152         regmap_reg_range(SLG51000_LDO6_EVENT, SLG51000_LDO6_STATUS),
153         regmap_reg_range(SLG51000_LDO7_EVENT, SLG51000_LDO7_STATUS),
154         regmap_reg_range(SLG51000_OTP_EVENT, SLG51000_OTP_EVENT),
155 };
156
157 static const struct regmap_access_table slg51000_writeable_table = {
158         .yes_ranges     = slg51000_writeable_ranges,
159         .n_yes_ranges   = ARRAY_SIZE(slg51000_writeable_ranges),
160 };
161
162 static const struct regmap_access_table slg51000_readable_table = {
163         .yes_ranges     = slg51000_readable_ranges,
164         .n_yes_ranges   = ARRAY_SIZE(slg51000_readable_ranges),
165 };
166
167 static const struct regmap_access_table slg51000_volatile_table = {
168         .yes_ranges     = slg51000_volatile_ranges,
169         .n_yes_ranges   = ARRAY_SIZE(slg51000_volatile_ranges),
170 };
171
172 static const struct regmap_config slg51000_regmap_config = {
173         .reg_bits = 16,
174         .val_bits = 8,
175         .max_register = 0x8000,
176         .wr_table = &slg51000_writeable_table,
177         .rd_table = &slg51000_readable_table,
178         .volatile_table = &slg51000_volatile_table,
179 };
180
181 static const struct regulator_ops slg51000_regl_ops = {
182         .enable = regulator_enable_regmap,
183         .disable = regulator_disable_regmap,
184         .is_enabled = regulator_is_enabled_regmap,
185         .list_voltage = regulator_list_voltage_linear,
186         .map_voltage = regulator_map_voltage_linear,
187         .get_voltage_sel = regulator_get_voltage_sel_regmap,
188         .set_voltage_sel = regulator_set_voltage_sel_regmap,
189 };
190
191 static const struct regulator_ops slg51000_switch_ops = {
192         .enable = regulator_enable_regmap,
193         .disable = regulator_disable_regmap,
194         .is_enabled = regulator_is_enabled_regmap,
195 };
196
197 static int slg51000_of_parse_cb(struct device_node *np,
198                                 const struct regulator_desc *desc,
199                                 struct regulator_config *config)
200 {
201         struct slg51000 *chip = config->driver_data;
202         struct gpio_desc *ena_gpiod;
203         enum gpiod_flags gflags = GPIOD_OUT_LOW | GPIOD_FLAGS_BIT_NONEXCLUSIVE;
204
205         ena_gpiod = devm_gpiod_get_from_of_node(chip->dev, np,
206                                                 "enable-gpios", 0,
207                                                 gflags, "gpio-en-ldo");
208         if (!IS_ERR(ena_gpiod)) {
209                 config->ena_gpiod = ena_gpiod;
210                 devm_gpiod_unhinge(chip->dev, config->ena_gpiod);
211         }
212
213         return 0;
214 }
215
216 #define SLG51000_REGL_DESC(_id, _name, _s_name, _min, _step) \
217         [SLG51000_REGULATOR_##_id] = {                             \
218                 .name = #_name,                                    \
219                 .supply_name = _s_name,                            \
220                 .id = SLG51000_REGULATOR_##_id,                    \
221                 .of_match = of_match_ptr(#_name),                  \
222                 .of_parse_cb = slg51000_of_parse_cb,               \
223                 .ops = &slg51000_regl_ops,                         \
224                 .regulators_node = of_match_ptr("regulators"),     \
225                 .n_voltages = 256,                                 \
226                 .min_uV = _min,                                    \
227                 .uV_step = _step,                                  \
228                 .linear_min_sel = 0,                               \
229                 .vsel_mask = SLG51000_VSEL_MASK,                   \
230                 .vsel_reg = SLG51000_##_id##_VSEL,                 \
231                 .enable_reg = SLG51000_SYSCTL_MATRIX_CONF_A,       \
232                 .enable_mask = BIT(SLG51000_REGULATOR_##_id),      \
233                 .type = REGULATOR_VOLTAGE,                         \
234                 .owner = THIS_MODULE,                              \
235         }
236
237 static struct regulator_desc regls_desc[SLG51000_MAX_REGULATORS] = {
238         SLG51000_REGL_DESC(LDO1, ldo1, NULL,   2400000,  5000),
239         SLG51000_REGL_DESC(LDO2, ldo2, NULL,   2400000,  5000),
240         SLG51000_REGL_DESC(LDO3, ldo3, "vin3", 1200000, 10000),
241         SLG51000_REGL_DESC(LDO4, ldo4, "vin4", 1200000, 10000),
242         SLG51000_REGL_DESC(LDO5, ldo5, "vin5",  400000,  5000),
243         SLG51000_REGL_DESC(LDO6, ldo6, "vin6",  400000,  5000),
244         SLG51000_REGL_DESC(LDO7, ldo7, "vin7", 1200000, 10000),
245 };
246
247 static int slg51000_regulator_init(struct slg51000 *chip)
248 {
249         struct regulator_config config = { };
250         struct regulator_desc *rdesc;
251         unsigned int reg, val;
252         u8 vsel_range[2];
253         int id, ret = 0;
254         const unsigned int min_regs[SLG51000_MAX_REGULATORS] = {
255                 SLG51000_LDO1_MINV, SLG51000_LDO2_MINV, SLG51000_LDO3_MINV,
256                 SLG51000_LDO4_MINV, SLG51000_LDO5_MINV, SLG51000_LDO6_MINV,
257                 SLG51000_LDO7_MINV,
258         };
259
260         for (id = 0; id < SLG51000_MAX_REGULATORS; id++) {
261                 chip->rdesc[id] = &regls_desc[id];
262                 rdesc = chip->rdesc[id];
263                 config.regmap = chip->regmap;
264                 config.dev = chip->dev;
265                 config.driver_data = chip;
266
267                 ret = regmap_bulk_read(chip->regmap, min_regs[id],
268                                        vsel_range, 2);
269                 if (ret < 0) {
270                         dev_err(chip->dev,
271                                 "Failed to read the MIN register\n");
272                         return ret;
273                 }
274
275                 switch (id) {
276                 case SLG51000_REGULATOR_LDO1:
277                 case SLG51000_REGULATOR_LDO2:
278                         if (id == SLG51000_REGULATOR_LDO1)
279                                 reg = SLG51000_LDO1_MISC1;
280                         else
281                                 reg = SLG51000_LDO2_MISC1;
282
283                         ret = regmap_read(chip->regmap, reg, &val);
284                         if (ret < 0) {
285                                 dev_err(chip->dev,
286                                         "Failed to read voltage range of ldo%d\n",
287                                         id + 1);
288                                 return ret;
289                         }
290
291                         rdesc->linear_min_sel = vsel_range[0];
292                         rdesc->n_voltages = vsel_range[1] + 1;
293                         if (val & SLG51000_SEL_VRANGE_MASK)
294                                 rdesc->min_uV = SLG51000_LDOHP_HV_MIN
295                                                 + (vsel_range[0]
296                                                    * rdesc->uV_step);
297                         else
298                                 rdesc->min_uV = SLG51000_LDOHP_LV_MIN
299                                                 + (vsel_range[0]
300                                                    * rdesc->uV_step);
301                         break;
302
303                 case SLG51000_REGULATOR_LDO5:
304                 case SLG51000_REGULATOR_LDO6:
305                         if (id == SLG51000_REGULATOR_LDO5)
306                                 reg = SLG51000_LDO5_TRIM2;
307                         else
308                                 reg = SLG51000_LDO6_TRIM2;
309
310                         ret = regmap_read(chip->regmap, reg, &val);
311                         if (ret < 0) {
312                                 dev_err(chip->dev,
313                                         "Failed to read LDO mode register\n");
314                                 return ret;
315                         }
316
317                         if (val & SLG51000_SEL_BYP_MODE_MASK) {
318                                 rdesc->ops = &slg51000_switch_ops;
319                                 rdesc->n_voltages = 0;
320                                 rdesc->min_uV = 0;
321                                 rdesc->uV_step = 0;
322                                 rdesc->linear_min_sel = 0;
323                                 break;
324                         }
325                         /* Fall through - to the check below.*/
326
327                 default:
328                         rdesc->linear_min_sel = vsel_range[0];
329                         rdesc->n_voltages = vsel_range[1] + 1;
330                         rdesc->min_uV = rdesc->min_uV
331                                         + (vsel_range[0] * rdesc->uV_step);
332                         break;
333                 }
334
335                 chip->rdev[id] = devm_regulator_register(chip->dev, rdesc,
336                                                          &config);
337                 if (IS_ERR(chip->rdev[id])) {
338                         ret = PTR_ERR(chip->rdev[id]);
339                         dev_err(chip->dev,
340                                 "Failed to register regulator(%s):%d\n",
341                                 chip->rdesc[id]->name, ret);
342                         return ret;
343                 }
344         }
345
346         return 0;
347 }
348
349 static irqreturn_t slg51000_irq_handler(int irq, void *data)
350 {
351         struct slg51000 *chip = data;
352         struct regmap *regmap = chip->regmap;
353         enum { R0 = 0, R1, R2, REG_MAX };
354         u8 evt[SLG51000_MAX_EVT_REGISTER][REG_MAX];
355         int ret, i, handled = IRQ_NONE;
356         unsigned int evt_otp, mask_otp;
357
358         /* Read event[R0], status[R1] and mask[R2] register */
359         for (i = 0; i < SLG51000_MAX_EVT_REGISTER; i++) {
360                 ret = regmap_bulk_read(regmap, es_reg[i].ereg, evt[i], REG_MAX);
361                 if (ret < 0) {
362                         dev_err(chip->dev,
363                                 "Failed to read event registers(%d)\n", ret);
364                         return IRQ_NONE;
365                 }
366         }
367
368         ret = regmap_read(regmap, SLG51000_OTP_EVENT, &evt_otp);
369         if (ret < 0) {
370                 dev_err(chip->dev,
371                         "Failed to read otp event registers(%d)\n", ret);
372                 return IRQ_NONE;
373         }
374
375         ret = regmap_read(regmap, SLG51000_OTP_IRQ_MASK, &mask_otp);
376         if (ret < 0) {
377                 dev_err(chip->dev,
378                         "Failed to read otp mask register(%d)\n", ret);
379                 return IRQ_NONE;
380         }
381
382         if ((evt_otp & SLG51000_EVT_CRC_MASK) &&
383             !(mask_otp & SLG51000_IRQ_CRC_MASK)) {
384                 dev_info(chip->dev,
385                          "OTP has been read or OTP crc is not zero\n");
386                 handled = IRQ_HANDLED;
387         }
388
389         for (i = 0; i < SLG51000_MAX_REGULATORS; i++) {
390                 if (!(evt[i][R2] & SLG51000_IRQ_ILIM_FLAG_MASK) &&
391                     (evt[i][R0] & SLG51000_EVT_ILIM_FLAG_MASK)) {
392                         regulator_lock(chip->rdev[i]);
393                         regulator_notifier_call_chain(chip->rdev[i],
394                                             REGULATOR_EVENT_OVER_CURRENT, NULL);
395                         regulator_unlock(chip->rdev[i]);
396
397                         if (evt[i][R1] & SLG51000_STA_ILIM_FLAG_MASK)
398                                 dev_warn(chip->dev,
399                                          "Over-current limit(ldo%d)\n", i + 1);
400                         handled = IRQ_HANDLED;
401                 }
402         }
403
404         if (!(evt[SLG51000_SCTL_EVT][R2] & SLG51000_IRQ_HIGH_TEMP_WARN_MASK) &&
405             (evt[SLG51000_SCTL_EVT][R0] & SLG51000_EVT_HIGH_TEMP_WARN_MASK)) {
406                 for (i = 0; i < SLG51000_MAX_REGULATORS; i++) {
407                         if (!(evt[i][R1] & SLG51000_STA_ILIM_FLAG_MASK) &&
408                             (evt[i][R1] & SLG51000_STA_VOUT_OK_FLAG_MASK)) {
409                                 regulator_lock(chip->rdev[i]);
410                                 regulator_notifier_call_chain(chip->rdev[i],
411                                                REGULATOR_EVENT_OVER_TEMP, NULL);
412                                 regulator_unlock(chip->rdev[i]);
413                         }
414                 }
415                 handled = IRQ_HANDLED;
416                 if (evt[SLG51000_SCTL_EVT][R1] &
417                     SLG51000_STA_HIGH_TEMP_WARN_MASK)
418                         dev_warn(chip->dev, "High temperature warning!\n");
419         }
420
421         return handled;
422 }
423
424 static void slg51000_clear_fault_log(struct slg51000 *chip)
425 {
426         unsigned int val = 0;
427         int ret = 0;
428
429         ret = regmap_read(chip->regmap, SLG51000_SYSCTL_FAULT_LOG1, &val);
430         if (ret < 0) {
431                 dev_err(chip->dev, "Failed to read Fault log register\n");
432                 return;
433         }
434
435         if (val & SLG51000_FLT_OVER_TEMP_MASK)
436                 dev_dbg(chip->dev, "Fault log: FLT_OVER_TEMP\n");
437         if (val & SLG51000_FLT_POWER_SEQ_CRASH_REQ_MASK)
438                 dev_dbg(chip->dev, "Fault log: FLT_POWER_SEQ_CRASH_REQ\n");
439         if (val & SLG51000_FLT_RST_MASK)
440                 dev_dbg(chip->dev, "Fault log: FLT_RST\n");
441         if (val & SLG51000_FLT_POR_MASK)
442                 dev_dbg(chip->dev, "Fault log: FLT_POR\n");
443 }
444
445 static int slg51000_i2c_probe(struct i2c_client *client,
446                               const struct i2c_device_id *id)
447 {
448         struct device *dev = &client->dev;
449         struct slg51000 *chip;
450         struct gpio_desc *cs_gpiod;
451         int error, ret;
452
453         chip = devm_kzalloc(dev, sizeof(struct slg51000), GFP_KERNEL);
454         if (!chip)
455                 return -ENOMEM;
456
457         cs_gpiod = devm_gpiod_get_optional(dev, "dlg,cs",
458                                            GPIOD_OUT_HIGH |
459                                                 GPIOD_FLAGS_BIT_NONEXCLUSIVE);
460         if (IS_ERR(cs_gpiod))
461                 return PTR_ERR(cs_gpiod);
462
463         if (cs_gpiod) {
464                 dev_info(dev, "Found chip selector property\n");
465                 chip->cs_gpiod = cs_gpiod;
466         }
467
468         i2c_set_clientdata(client, chip);
469         chip->chip_irq = client->irq;
470         chip->dev = dev;
471         chip->regmap = devm_regmap_init_i2c(client, &slg51000_regmap_config);
472         if (IS_ERR(chip->regmap)) {
473                 error = PTR_ERR(chip->regmap);
474                 dev_err(dev, "Failed to allocate register map: %d\n",
475                         error);
476                 return error;
477         }
478
479         ret = slg51000_regulator_init(chip);
480         if (ret < 0) {
481                 dev_err(chip->dev, "Failed to init regulator(%d)\n", ret);
482                 return ret;
483         }
484
485         slg51000_clear_fault_log(chip);
486
487         if (chip->chip_irq) {
488                 ret = devm_request_threaded_irq(dev, chip->chip_irq, NULL,
489                                                 slg51000_irq_handler,
490                                                 (IRQF_TRIGGER_HIGH |
491                                                 IRQF_ONESHOT),
492                                                 "slg51000-irq", chip);
493                 if (ret != 0) {
494                         dev_err(dev, "Failed to request IRQ: %d\n",
495                                 chip->chip_irq);
496                         return ret;
497                 }
498         } else {
499                 dev_info(dev, "No IRQ configured\n");
500         }
501
502         return ret;
503 }
504
505 static const struct i2c_device_id slg51000_i2c_id[] = {
506         {"slg51000", 0},
507         {},
508 };
509 MODULE_DEVICE_TABLE(i2c, slg51000_i2c_id);
510
511 static struct i2c_driver slg51000_regulator_driver = {
512         .driver = {
513                 .name = "slg51000-regulator",
514         },
515         .probe = slg51000_i2c_probe,
516         .id_table = slg51000_i2c_id,
517 };
518
519 module_i2c_driver(slg51000_regulator_driver);
520
521 MODULE_AUTHOR("Eric Jeong <eric.jeong.opensource@diasemi.com>");
522 MODULE_DESCRIPTION("SLG51000 regulator driver");
523 MODULE_LICENSE("GPL");
524