1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * intel_pmic.c - Intel PMIC operation region driver
4 *
5 * Copyright (C) 2014 Intel Corporation. All rights reserved.
6 */
7
8 #include <linux/export.h>
9 #include <linux/acpi.h>
10 #include <linux/mfd/intel_soc_pmic.h>
11 #include <linux/regmap.h>
12 #include <acpi/acpi_lpat.h>
13 #include "intel_pmic.h"
14
15 #define PMIC_POWER_OPREGION_ID 0x8d
16 #define PMIC_THERMAL_OPREGION_ID 0x8c
17 #define PMIC_REGS_OPREGION_ID 0x8f
18
19 struct intel_pmic_regs_handler_ctx {
20 unsigned int val;
21 u16 addr;
22 };
23
24 struct intel_pmic_opregion {
25 struct mutex lock;
26 struct acpi_lpat_conversion_table *lpat_table;
27 struct regmap *regmap;
28 struct intel_pmic_opregion_data *data;
29 struct intel_pmic_regs_handler_ctx ctx;
30 };
31
32 static struct intel_pmic_opregion *intel_pmic_opregion;
33
pmic_get_reg_bit(int address,struct pmic_table * table,int count,int * reg,int * bit)34 static int pmic_get_reg_bit(int address, struct pmic_table *table,
35 int count, int *reg, int *bit)
36 {
37 int i;
38
39 for (i = 0; i < count; i++) {
40 if (table[i].address == address) {
41 *reg = table[i].reg;
42 if (bit)
43 *bit = table[i].bit;
44 return 0;
45 }
46 }
47 return -ENOENT;
48 }
49
intel_pmic_power_handler(u32 function,acpi_physical_address address,u32 bits,u64 * value64,void * handler_context,void * region_context)50 static acpi_status intel_pmic_power_handler(u32 function,
51 acpi_physical_address address, u32 bits, u64 *value64,
52 void *handler_context, void *region_context)
53 {
54 struct intel_pmic_opregion *opregion = region_context;
55 struct regmap *regmap = opregion->regmap;
56 struct intel_pmic_opregion_data *d = opregion->data;
57 int reg, bit, result;
58
59 if (bits != 32 || !value64)
60 return AE_BAD_PARAMETER;
61
62 if (function == ACPI_WRITE && !(*value64 == 0 || *value64 == 1))
63 return AE_BAD_PARAMETER;
64
65 result = pmic_get_reg_bit(address, d->power_table,
66 d->power_table_count, ®, &bit);
67 if (result == -ENOENT)
68 return AE_BAD_PARAMETER;
69
70 mutex_lock(&opregion->lock);
71
72 result = function == ACPI_READ ?
73 d->get_power(regmap, reg, bit, value64) :
74 d->update_power(regmap, reg, bit, *value64 == 1);
75
76 mutex_unlock(&opregion->lock);
77
78 return result ? AE_ERROR : AE_OK;
79 }
80
pmic_read_temp(struct intel_pmic_opregion * opregion,int reg,u64 * value)81 static int pmic_read_temp(struct intel_pmic_opregion *opregion,
82 int reg, u64 *value)
83 {
84 int raw_temp, temp;
85
86 if (!opregion->data->get_raw_temp)
87 return -ENXIO;
88
89 raw_temp = opregion->data->get_raw_temp(opregion->regmap, reg);
90 if (raw_temp < 0)
91 return raw_temp;
92
93 if (!opregion->lpat_table) {
94 *value = raw_temp;
95 return 0;
96 }
97
98 temp = acpi_lpat_raw_to_temp(opregion->lpat_table, raw_temp);
99 if (temp < 0)
100 return temp;
101
102 *value = temp;
103 return 0;
104 }
105
pmic_thermal_temp(struct intel_pmic_opregion * opregion,int reg,u32 function,u64 * value)106 static int pmic_thermal_temp(struct intel_pmic_opregion *opregion, int reg,
107 u32 function, u64 *value)
108 {
109 return function == ACPI_READ ?
110 pmic_read_temp(opregion, reg, value) : -EINVAL;
111 }
112
pmic_thermal_aux(struct intel_pmic_opregion * opregion,int reg,u32 function,u64 * value)113 static int pmic_thermal_aux(struct intel_pmic_opregion *opregion, int reg,
114 u32 function, u64 *value)
115 {
116 int raw_temp;
117
118 if (function == ACPI_READ)
119 return pmic_read_temp(opregion, reg, value);
120
121 if (!opregion->data->update_aux)
122 return -ENXIO;
123
124 if (opregion->lpat_table) {
125 raw_temp = acpi_lpat_temp_to_raw(opregion->lpat_table, *value);
126 if (raw_temp < 0)
127 return raw_temp;
128 } else {
129 raw_temp = *value;
130 }
131
132 return opregion->data->update_aux(opregion->regmap, reg, raw_temp);
133 }
134
pmic_thermal_pen(struct intel_pmic_opregion * opregion,int reg,int bit,u32 function,u64 * value)135 static int pmic_thermal_pen(struct intel_pmic_opregion *opregion, int reg,
136 int bit, u32 function, u64 *value)
137 {
138 struct intel_pmic_opregion_data *d = opregion->data;
139 struct regmap *regmap = opregion->regmap;
140
141 if (!d->get_policy || !d->update_policy)
142 return -ENXIO;
143
144 if (function == ACPI_READ)
145 return d->get_policy(regmap, reg, bit, value);
146
147 if (*value != 0 && *value != 1)
148 return -EINVAL;
149
150 return d->update_policy(regmap, reg, bit, *value);
151 }
152
pmic_thermal_is_temp(int address)153 static bool pmic_thermal_is_temp(int address)
154 {
155 return (address <= 0x3c) && !(address % 12);
156 }
157
pmic_thermal_is_aux(int address)158 static bool pmic_thermal_is_aux(int address)
159 {
160 return (address >= 4 && address <= 0x40 && !((address - 4) % 12)) ||
161 (address >= 8 && address <= 0x44 && !((address - 8) % 12));
162 }
163
pmic_thermal_is_pen(int address)164 static bool pmic_thermal_is_pen(int address)
165 {
166 return address >= 0x48 && address <= 0x5c;
167 }
168
intel_pmic_thermal_handler(u32 function,acpi_physical_address address,u32 bits,u64 * value64,void * handler_context,void * region_context)169 static acpi_status intel_pmic_thermal_handler(u32 function,
170 acpi_physical_address address, u32 bits, u64 *value64,
171 void *handler_context, void *region_context)
172 {
173 struct intel_pmic_opregion *opregion = region_context;
174 struct intel_pmic_opregion_data *d = opregion->data;
175 int reg, bit, result;
176
177 if (bits != 32 || !value64)
178 return AE_BAD_PARAMETER;
179
180 result = pmic_get_reg_bit(address, d->thermal_table,
181 d->thermal_table_count, ®, &bit);
182 if (result == -ENOENT)
183 return AE_BAD_PARAMETER;
184
185 mutex_lock(&opregion->lock);
186
187 if (pmic_thermal_is_temp(address))
188 result = pmic_thermal_temp(opregion, reg, function, value64);
189 else if (pmic_thermal_is_aux(address))
190 result = pmic_thermal_aux(opregion, reg, function, value64);
191 else if (pmic_thermal_is_pen(address))
192 result = pmic_thermal_pen(opregion, reg, bit,
193 function, value64);
194 else
195 result = -EINVAL;
196
197 mutex_unlock(&opregion->lock);
198
199 if (result < 0) {
200 if (result == -EINVAL)
201 return AE_BAD_PARAMETER;
202 else
203 return AE_ERROR;
204 }
205
206 return AE_OK;
207 }
208
intel_pmic_regs_handler(u32 function,acpi_physical_address address,u32 bits,u64 * value64,void * handler_context,void * region_context)209 static acpi_status intel_pmic_regs_handler(u32 function,
210 acpi_physical_address address, u32 bits, u64 *value64,
211 void *handler_context, void *region_context)
212 {
213 struct intel_pmic_opregion *opregion = region_context;
214 int result = 0;
215
216 switch (address) {
217 case 0:
218 return AE_OK;
219 case 1:
220 opregion->ctx.addr |= (*value64 & 0xff) << 8;
221 return AE_OK;
222 case 2:
223 opregion->ctx.addr |= *value64 & 0xff;
224 return AE_OK;
225 case 3:
226 opregion->ctx.val = *value64 & 0xff;
227 return AE_OK;
228 case 4:
229 if (*value64) {
230 result = regmap_write(opregion->regmap, opregion->ctx.addr,
231 opregion->ctx.val);
232 } else {
233 result = regmap_read(opregion->regmap, opregion->ctx.addr,
234 &opregion->ctx.val);
235 if (result == 0)
236 *value64 = opregion->ctx.val;
237 }
238 memset(&opregion->ctx, 0x00, sizeof(opregion->ctx));
239 }
240
241 if (result < 0) {
242 if (result == -EINVAL)
243 return AE_BAD_PARAMETER;
244 else
245 return AE_ERROR;
246 }
247
248 return AE_OK;
249 }
250
intel_pmic_install_opregion_handler(struct device * dev,acpi_handle handle,struct regmap * regmap,struct intel_pmic_opregion_data * d)251 int intel_pmic_install_opregion_handler(struct device *dev, acpi_handle handle,
252 struct regmap *regmap,
253 struct intel_pmic_opregion_data *d)
254 {
255 acpi_status status = AE_OK;
256 struct intel_pmic_opregion *opregion;
257 int ret;
258
259 if (!dev || !regmap || !d)
260 return -EINVAL;
261
262 if (!handle)
263 return -ENODEV;
264
265 opregion = devm_kzalloc(dev, sizeof(*opregion), GFP_KERNEL);
266 if (!opregion)
267 return -ENOMEM;
268
269 mutex_init(&opregion->lock);
270 opregion->regmap = regmap;
271 opregion->lpat_table = acpi_lpat_get_conversion_table(handle);
272
273 if (d->power_table_count)
274 status = acpi_install_address_space_handler(handle,
275 PMIC_POWER_OPREGION_ID,
276 intel_pmic_power_handler,
277 NULL, opregion);
278 if (ACPI_FAILURE(status)) {
279 ret = -ENODEV;
280 goto out_error;
281 }
282
283 if (d->thermal_table_count)
284 status = acpi_install_address_space_handler(handle,
285 PMIC_THERMAL_OPREGION_ID,
286 intel_pmic_thermal_handler,
287 NULL, opregion);
288 if (ACPI_FAILURE(status)) {
289 ret = -ENODEV;
290 goto out_remove_power_handler;
291 }
292
293 status = acpi_install_address_space_handler(handle,
294 PMIC_REGS_OPREGION_ID, intel_pmic_regs_handler, NULL,
295 opregion);
296 if (ACPI_FAILURE(status)) {
297 ret = -ENODEV;
298 goto out_remove_thermal_handler;
299 }
300
301 opregion->data = d;
302 intel_pmic_opregion = opregion;
303 return 0;
304
305 out_remove_thermal_handler:
306 if (d->thermal_table_count)
307 acpi_remove_address_space_handler(handle,
308 PMIC_THERMAL_OPREGION_ID,
309 intel_pmic_thermal_handler);
310
311 out_remove_power_handler:
312 if (d->power_table_count)
313 acpi_remove_address_space_handler(handle,
314 PMIC_POWER_OPREGION_ID,
315 intel_pmic_power_handler);
316
317 out_error:
318 acpi_lpat_free_conversion_table(opregion->lpat_table);
319 return ret;
320 }
321 EXPORT_SYMBOL_GPL(intel_pmic_install_opregion_handler);
322
323 /**
324 * intel_soc_pmic_exec_mipi_pmic_seq_element - Execute PMIC MIPI sequence
325 * @i2c_address: I2C client address for the PMIC
326 * @reg_address: PMIC register address
327 * @value: New value for the register bits to change
328 * @mask: Mask indicating which register bits to change
329 *
330 * DSI LCD panels describe an initialization sequence in the i915 VBT (Video
331 * BIOS Tables) using so called MIPI sequences. One possible element in these
332 * sequences is a PMIC specific element of 15 bytes.
333 *
334 * This function executes these PMIC specific elements sending the embedded
335 * commands to the PMIC.
336 *
337 * Return 0 on success, < 0 on failure.
338 */
intel_soc_pmic_exec_mipi_pmic_seq_element(u16 i2c_address,u32 reg_address,u32 value,u32 mask)339 int intel_soc_pmic_exec_mipi_pmic_seq_element(u16 i2c_address, u32 reg_address,
340 u32 value, u32 mask)
341 {
342 struct intel_pmic_opregion_data *d;
343 int ret;
344
345 if (!intel_pmic_opregion) {
346 pr_warn("%s: No PMIC registered\n", __func__);
347 return -ENXIO;
348 }
349
350 d = intel_pmic_opregion->data;
351
352 mutex_lock(&intel_pmic_opregion->lock);
353
354 if (d->exec_mipi_pmic_seq_element) {
355 ret = d->exec_mipi_pmic_seq_element(intel_pmic_opregion->regmap,
356 i2c_address, reg_address,
357 value, mask);
358 } else if (d->pmic_i2c_address) {
359 if (i2c_address == d->pmic_i2c_address) {
360 ret = regmap_update_bits(intel_pmic_opregion->regmap,
361 reg_address, mask, value);
362 } else {
363 pr_err("%s: Unexpected i2c-addr: 0x%02x (reg-addr 0x%x value 0x%x mask 0x%x)\n",
364 __func__, i2c_address, reg_address, value, mask);
365 ret = -ENXIO;
366 }
367 } else {
368 pr_warn("%s: Not implemented\n", __func__);
369 pr_warn("%s: i2c-addr: 0x%x reg-addr 0x%x value 0x%x mask 0x%x\n",
370 __func__, i2c_address, reg_address, value, mask);
371 ret = -EOPNOTSUPP;
372 }
373
374 mutex_unlock(&intel_pmic_opregion->lock);
375
376 return ret;
377 }
378 EXPORT_SYMBOL_GPL(intel_soc_pmic_exec_mipi_pmic_seq_element);
379
