1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/module.h>
3 #include <linux/i2c.h>
4 #include <linux/dmi.h>
5 #include <linux/efi.h>
6 #include <linux/pci.h>
7 #include <linux/acpi.h>
8 #include <linux/clk.h>
9 #include <linux/delay.h>
10 #include <media/v4l2-subdev.h>
11 #include <linux/mfd/intel_soc_pmic.h>
12 #include <linux/regulator/consumer.h>
13 #include <linux/gpio/consumer.h>
14 #include <linux/gpio.h>
15 #include <linux/platform_device.h>
16 #include "../../include/linux/atomisp_platform.h"
17 #include "../../include/linux/atomisp_gmin_platform.h"
18
19 #define MAX_SUBDEVS 8
20
21 enum clock_rate {
22 VLV2_CLK_XTAL_25_0MHz = 0,
23 VLV2_CLK_PLL_19P2MHZ = 1
24 };
25
26 #define CLK_RATE_19_2MHZ 19200000
27 #define CLK_RATE_25_0MHZ 25000000
28
29 /* Valid clock number range from 0 to 5 */
30 #define MAX_CLK_COUNT 5
31
32 /* X-Powers AXP288 register set */
33 #define ALDO1_SEL_REG 0x28
34 #define ALDO1_CTRL3_REG 0x13
35 #define ALDO1_2P8V 0x16
36 #define ALDO1_CTRL3_SHIFT 0x05
37
38 #define ELDO_CTRL_REG 0x12
39
40 #define ELDO1_SEL_REG 0x19
41 #define ELDO1_1P6V 0x12
42 #define ELDO1_CTRL_SHIFT 0x00
43
44 #define ELDO2_SEL_REG 0x1a
45 #define ELDO2_1P8V 0x16
46 #define ELDO2_CTRL_SHIFT 0x01
47
48 /* TI SND9039 PMIC register set */
49 #define LDO9_REG 0x49
50 #define LDO10_REG 0x4a
51 #define LDO11_REG 0x4b
52
53 #define LDO_2P8V_ON 0x2f /* 0x2e selects 2.85V ... */
54 #define LDO_2P8V_OFF 0x2e /* ... bottom bit is "enabled" */
55
56 #define LDO_1P8V_ON 0x59 /* 0x58 selects 1.80V ... */
57 #define LDO_1P8V_OFF 0x58 /* ... bottom bit is "enabled" */
58
59 /* CRYSTAL COVE PMIC register set */
60 #define CRYSTAL_1P8V_REG 0x57
61 #define CRYSTAL_2P8V_REG 0x5d
62 #define CRYSTAL_ON 0x63
63 #define CRYSTAL_OFF 0x62
64
65 struct gmin_subdev {
66 struct v4l2_subdev *subdev;
67 enum clock_rate clock_src;
68 struct clk *pmc_clk;
69 struct gpio_desc *gpio0;
70 struct gpio_desc *gpio1;
71 struct regulator *v1p8_reg;
72 struct regulator *v2p8_reg;
73 struct regulator *v1p2_reg;
74 struct regulator *v2p8_vcm_reg;
75 enum atomisp_camera_port csi_port;
76 unsigned int csi_lanes;
77 enum atomisp_input_format csi_fmt;
78 enum atomisp_bayer_order csi_bayer;
79
80 bool clock_on;
81 bool v1p8_on;
82 bool v2p8_on;
83 bool v1p2_on;
84 bool v2p8_vcm_on;
85
86 int v1p8_gpio;
87 int v2p8_gpio;
88
89 u8 pwm_i2c_addr;
90
91 /* For PMIC AXP */
92 int eldo1_sel_reg, eldo1_1p6v, eldo1_ctrl_shift;
93 int eldo2_sel_reg, eldo2_1p8v, eldo2_ctrl_shift;
94 };
95
96 static struct gmin_subdev gmin_subdevs[MAX_SUBDEVS];
97
98 /* ACPI HIDs for the PMICs that could be used by this driver */
99 #define PMIC_ACPI_AXP "INT33F4" /* XPower AXP288 PMIC */
100 #define PMIC_ACPI_TI "INT33F5" /* Dollar Cove TI PMIC */
101 #define PMIC_ACPI_CRYSTALCOVE "INT33FD" /* Crystal Cove PMIC */
102
103 #define PMIC_PLATFORM_TI "intel_soc_pmic_chtdc_ti"
104
105 static enum {
106 PMIC_UNSET = 0,
107 PMIC_REGULATOR,
108 PMIC_AXP,
109 PMIC_TI,
110 PMIC_CRYSTALCOVE
111 } pmic_id;
112
113 static const char *pmic_name[] = {
114 [PMIC_UNSET] = "ACPI device PM",
115 [PMIC_REGULATOR] = "regulator driver",
116 [PMIC_AXP] = "XPower AXP288 PMIC",
117 [PMIC_TI] = "Dollar Cove TI PMIC",
118 [PMIC_CRYSTALCOVE] = "Crystal Cove PMIC",
119 };
120
121 static DEFINE_MUTEX(gmin_regulator_mutex);
122 static int gmin_v1p8_enable_count;
123 static int gmin_v2p8_enable_count;
124
125 /* The atomisp uses type==0 for the end-of-list marker, so leave space. */
126 static struct intel_v4l2_subdev_table pdata_subdevs[MAX_SUBDEVS + 1];
127
128 static const struct atomisp_platform_data pdata = {
129 .subdevs = pdata_subdevs,
130 };
131
132 static LIST_HEAD(vcm_devices);
133 static DEFINE_MUTEX(vcm_lock);
134
135 static struct gmin_subdev *find_gmin_subdev(struct v4l2_subdev *subdev);
136
atomisp_get_platform_data(void)137 const struct atomisp_platform_data *atomisp_get_platform_data(void)
138 {
139 return &pdata;
140 }
141 EXPORT_SYMBOL_GPL(atomisp_get_platform_data);
142
atomisp_register_i2c_module(struct v4l2_subdev * subdev,struct camera_sensor_platform_data * plat_data,enum intel_v4l2_subdev_type type)143 int atomisp_register_i2c_module(struct v4l2_subdev *subdev,
144 struct camera_sensor_platform_data *plat_data,
145 enum intel_v4l2_subdev_type type)
146 {
147 int i;
148 struct i2c_board_info *bi;
149 struct gmin_subdev *gs;
150 struct i2c_client *client = v4l2_get_subdevdata(subdev);
151 struct acpi_device *adev = ACPI_COMPANION(&client->dev);
152
153 dev_info(&client->dev, "register atomisp i2c module type %d\n", type);
154
155 /* The windows driver model (and thus most BIOSes by default)
156 * uses ACPI runtime power management for camera devices, but
157 * we don't. Disable it, or else the rails will be needlessly
158 * tickled during suspend/resume. This has caused power and
159 * performance issues on multiple devices.
160 */
161 adev->power.flags.power_resources = 0;
162
163 for (i = 0; i < MAX_SUBDEVS; i++)
164 if (!pdata.subdevs[i].type)
165 break;
166
167 if (pdata.subdevs[i].type)
168 return -ENOMEM;
169
170 /* Note subtlety of initialization order: at the point where
171 * this registration API gets called, the platform data
172 * callbacks have probably already been invoked, so the
173 * gmin_subdev struct is already initialized for us.
174 */
175 gs = find_gmin_subdev(subdev);
176 if (!gs)
177 return -ENODEV;
178
179 pdata.subdevs[i].type = type;
180 pdata.subdevs[i].port = gs->csi_port;
181 pdata.subdevs[i].subdev = subdev;
182 pdata.subdevs[i].v4l2_subdev.i2c_adapter_id = client->adapter->nr;
183
184 /* Convert i2c_client to i2c_board_info */
185 bi = &pdata.subdevs[i].v4l2_subdev.board_info;
186 memcpy(bi->type, client->name, I2C_NAME_SIZE);
187 bi->flags = client->flags;
188 bi->addr = client->addr;
189 bi->irq = client->irq;
190 bi->platform_data = plat_data;
191
192 return 0;
193 }
194 EXPORT_SYMBOL_GPL(atomisp_register_i2c_module);
195
atomisp_gmin_find_subdev(struct i2c_adapter * adapter,struct i2c_board_info * board_info)196 struct v4l2_subdev *atomisp_gmin_find_subdev(struct i2c_adapter *adapter,
197 struct i2c_board_info *board_info)
198 {
199 int i;
200
201 for (i = 0; i < MAX_SUBDEVS && pdata.subdevs[i].type; i++) {
202 struct intel_v4l2_subdev_table *sd = &pdata.subdevs[i];
203
204 if (sd->v4l2_subdev.i2c_adapter_id == adapter->nr &&
205 sd->v4l2_subdev.board_info.addr == board_info->addr)
206 return sd->subdev;
207 }
208 return NULL;
209 }
210 EXPORT_SYMBOL_GPL(atomisp_gmin_find_subdev);
211
atomisp_gmin_remove_subdev(struct v4l2_subdev * sd)212 int atomisp_gmin_remove_subdev(struct v4l2_subdev *sd)
213 {
214 int i, j;
215
216 if (!sd)
217 return 0;
218
219 for (i = 0; i < MAX_SUBDEVS; i++) {
220 if (pdata.subdevs[i].subdev == sd) {
221 for (j = i + 1; j <= MAX_SUBDEVS; j++)
222 pdata.subdevs[j - 1] = pdata.subdevs[j];
223 }
224 if (gmin_subdevs[i].subdev == sd) {
225 if (gmin_subdevs[i].gpio0)
226 gpiod_put(gmin_subdevs[i].gpio0);
227 gmin_subdevs[i].gpio0 = NULL;
228 if (gmin_subdevs[i].gpio1)
229 gpiod_put(gmin_subdevs[i].gpio1);
230 gmin_subdevs[i].gpio1 = NULL;
231 if (pmic_id == PMIC_REGULATOR) {
232 regulator_put(gmin_subdevs[i].v1p8_reg);
233 regulator_put(gmin_subdevs[i].v2p8_reg);
234 regulator_put(gmin_subdevs[i].v1p2_reg);
235 regulator_put(gmin_subdevs[i].v2p8_vcm_reg);
236 }
237 gmin_subdevs[i].subdev = NULL;
238 }
239 }
240 return 0;
241 }
242 EXPORT_SYMBOL_GPL(atomisp_gmin_remove_subdev);
243
244 struct gmin_cfg_var {
245 const char *name, *val;
246 };
247
248 static struct gmin_cfg_var ffrd8_vars[] = {
249 { "INTCF1B:00_ImxId", "0x134" },
250 { "INTCF1B:00_CsiPort", "1" },
251 { "INTCF1B:00_CsiLanes", "4" },
252 { "INTCF1B:00_CamClk", "0" },
253 {},
254 };
255
256 /* Cribbed from MCG defaults in the mt9m114 driver, not actually verified
257 * vs. T100 hardware
258 */
259 static struct gmin_cfg_var t100_vars[] = {
260 { "INT33F0:00_CsiPort", "0" },
261 { "INT33F0:00_CsiLanes", "1" },
262 { "INT33F0:00_CamClk", "1" },
263 {},
264 };
265
266 static struct gmin_cfg_var mrd7_vars[] = {
267 {"INT33F8:00_CamType", "1"},
268 {"INT33F8:00_CsiPort", "1"},
269 {"INT33F8:00_CsiLanes", "2"},
270 {"INT33F8:00_CsiFmt", "13"},
271 {"INT33F8:00_CsiBayer", "0"},
272 {"INT33F8:00_CamClk", "0"},
273
274 {"INT33F9:00_CamType", "1"},
275 {"INT33F9:00_CsiPort", "0"},
276 {"INT33F9:00_CsiLanes", "1"},
277 {"INT33F9:00_CsiFmt", "13"},
278 {"INT33F9:00_CsiBayer", "0"},
279 {"INT33F9:00_CamClk", "1"},
280 {},
281 };
282
283 static struct gmin_cfg_var ecs7_vars[] = {
284 {"INT33BE:00_CsiPort", "1"},
285 {"INT33BE:00_CsiLanes", "2"},
286 {"INT33BE:00_CsiFmt", "13"},
287 {"INT33BE:00_CsiBayer", "2"},
288 {"INT33BE:00_CamClk", "0"},
289
290 {"INT33F0:00_CsiPort", "0"},
291 {"INT33F0:00_CsiLanes", "1"},
292 {"INT33F0:00_CsiFmt", "13"},
293 {"INT33F0:00_CsiBayer", "0"},
294 {"INT33F0:00_CamClk", "1"},
295 {"gmin_V2P8GPIO", "402"},
296 {},
297 };
298
299 static struct gmin_cfg_var i8880_vars[] = {
300 {"XXOV2680:00_CsiPort", "1"},
301 {"XXOV2680:00_CsiLanes", "1"},
302 {"XXOV2680:00_CamClk", "0"},
303
304 {"XXGC0310:00_CsiPort", "0"},
305 {"XXGC0310:00_CsiLanes", "1"},
306 {"XXGC0310:00_CamClk", "1"},
307 {},
308 };
309
310 /*
311 * Surface 3 does not describe CsiPort/CsiLanes in both DSDT and EFI.
312 */
313 static struct gmin_cfg_var surface3_vars[] = {
314 {"APTA0330:00_CsiPort", "0"},
315 {"APTA0330:00_CsiLanes", "2"},
316
317 {"OVTI8835:00_CsiPort", "1"},
318 {"OVTI8835:00_CsiLanes", "4"},
319 {},
320 };
321
322 static const struct dmi_system_id gmin_vars[] = {
323 {
324 .ident = "BYT-T FFD8",
325 .matches = {
326 DMI_MATCH(DMI_BOARD_NAME, "BYT-T FFD8"),
327 },
328 .driver_data = ffrd8_vars,
329 },
330 {
331 .ident = "T100TA",
332 .matches = {
333 DMI_MATCH(DMI_BOARD_NAME, "T100TA"),
334 },
335 .driver_data = t100_vars,
336 },
337 {
338 .ident = "MRD7",
339 .matches = {
340 DMI_MATCH(DMI_BOARD_NAME, "TABLET"),
341 DMI_MATCH(DMI_BOARD_VERSION, "MRD 7"),
342 },
343 .driver_data = mrd7_vars,
344 },
345 {
346 .ident = "ST70408",
347 .matches = {
348 DMI_MATCH(DMI_BOARD_NAME, "ST70408"),
349 },
350 .driver_data = ecs7_vars,
351 },
352 {
353 .ident = "VTA0803",
354 .matches = {
355 DMI_MATCH(DMI_BOARD_NAME, "VTA0803"),
356 },
357 .driver_data = i8880_vars,
358 },
359 {
360 .ident = "Surface 3",
361 .matches = {
362 DMI_MATCH(DMI_BOARD_NAME, "Surface 3"),
363 },
364 .driver_data = surface3_vars,
365 },
366 {}
367 };
368
369 #define GMIN_CFG_VAR_EFI_GUID EFI_GUID(0xecb54cd9, 0xe5ae, 0x4fdc, \
370 0xa9, 0x71, 0xe8, 0x77, \
371 0x75, 0x60, 0x68, 0xf7)
372
373 static const guid_t atomisp_dsm_guid = GUID_INIT(0xdc2f6c4f, 0x045b, 0x4f1d,
374 0x97, 0xb9, 0x88, 0x2a,
375 0x68, 0x60, 0xa4, 0xbe);
376
377 #define CFG_VAR_NAME_MAX 64
378
379 #define GMIN_PMC_CLK_NAME 14 /* "pmc_plt_clk_[0..5]" */
380 static char gmin_pmc_clk_name[GMIN_PMC_CLK_NAME];
381
gmin_i2c_dev_exists(struct device * dev,char * name,struct i2c_client ** client)382 static struct i2c_client *gmin_i2c_dev_exists(struct device *dev, char *name,
383 struct i2c_client **client)
384 {
385 struct acpi_device *adev;
386 struct device *d;
387
388 adev = acpi_dev_get_first_match_dev(name, NULL, -1);
389 if (!adev)
390 return NULL;
391
392 d = bus_find_device_by_acpi_dev(&i2c_bus_type, adev);
393 acpi_dev_put(adev);
394 if (!d)
395 return NULL;
396
397 *client = i2c_verify_client(d);
398 put_device(d);
399
400 dev_dbg(dev, "found '%s' at address 0x%02x, adapter %d\n",
401 (*client)->name, (*client)->addr, (*client)->adapter->nr);
402 return *client;
403 }
404
gmin_i2c_write(struct device * dev,u16 i2c_addr,u8 reg,u32 value,u32 mask)405 static int gmin_i2c_write(struct device *dev, u16 i2c_addr, u8 reg,
406 u32 value, u32 mask)
407 {
408 int ret;
409
410 /*
411 * FIXME: Right now, the intel_pmic driver just write values
412 * directly at the regmap, instead of properly implementing
413 * i2c_transfer() mechanism. Let's use the same interface here,
414 * as otherwise we may face issues.
415 */
416
417 dev_dbg(dev,
418 "I2C write, addr: 0x%02x, reg: 0x%02x, value: 0x%02x, mask: 0x%02x\n",
419 i2c_addr, reg, value, mask);
420
421 ret = intel_soc_pmic_exec_mipi_pmic_seq_element(i2c_addr, reg, value, mask);
422 if (ret == -EOPNOTSUPP)
423 dev_err(dev,
424 "ACPI didn't mapped the OpRegion needed to access I2C address 0x%02x.\n"
425 "Need to compile the kernel using CONFIG_*_PMIC_OPREGION settings\n",
426 i2c_addr);
427
428 return ret;
429 }
430
atomisp_get_acpi_power(struct device * dev)431 static int atomisp_get_acpi_power(struct device *dev)
432 {
433 char name[5];
434 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
435 struct acpi_buffer b_name = { sizeof(name), name };
436 union acpi_object *package, *element;
437 acpi_handle handle = ACPI_HANDLE(dev);
438 acpi_handle rhandle;
439 acpi_status status;
440 int clock_num = -1;
441 int i;
442
443 status = acpi_evaluate_object(handle, "_PR0", NULL, &buffer);
444 if (!ACPI_SUCCESS(status))
445 return -1;
446
447 package = buffer.pointer;
448
449 if (!buffer.length || !package
450 || package->type != ACPI_TYPE_PACKAGE
451 || !package->package.count)
452 goto fail;
453
454 for (i = 0; i < package->package.count; i++) {
455 element = &package->package.elements[i];
456
457 if (element->type != ACPI_TYPE_LOCAL_REFERENCE)
458 continue;
459
460 rhandle = element->reference.handle;
461 if (!rhandle)
462 goto fail;
463
464 acpi_get_name(rhandle, ACPI_SINGLE_NAME, &b_name);
465
466 dev_dbg(dev, "Found PM resource '%s'\n", name);
467 if (strlen(name) == 4 && !strncmp(name, "CLK", 3)) {
468 if (name[3] >= '0' && name[3] <= '4')
469 clock_num = name[3] - '0';
470 #if 0
471 /*
472 * We could abort here, but let's parse all resources,
473 * as this is helpful for debugging purposes
474 */
475 if (clock_num >= 0)
476 break;
477 #endif
478 }
479 }
480
481 fail:
482 ACPI_FREE(buffer.pointer);
483
484 return clock_num;
485 }
486
gmin_get_pmic_id_and_addr(struct device * dev)487 static u8 gmin_get_pmic_id_and_addr(struct device *dev)
488 {
489 struct i2c_client *power = NULL;
490 static u8 pmic_i2c_addr;
491
492 if (pmic_id)
493 return pmic_i2c_addr;
494
495 if (gmin_i2c_dev_exists(dev, PMIC_ACPI_TI, &power))
496 pmic_id = PMIC_TI;
497 else if (gmin_i2c_dev_exists(dev, PMIC_ACPI_AXP, &power))
498 pmic_id = PMIC_AXP;
499 else if (gmin_i2c_dev_exists(dev, PMIC_ACPI_CRYSTALCOVE, &power))
500 pmic_id = PMIC_CRYSTALCOVE;
501 else
502 pmic_id = PMIC_REGULATOR;
503
504 pmic_i2c_addr = power ? power->addr : 0;
505 return pmic_i2c_addr;
506 }
507
gmin_detect_pmic(struct v4l2_subdev * subdev)508 static int gmin_detect_pmic(struct v4l2_subdev *subdev)
509 {
510 struct i2c_client *client = v4l2_get_subdevdata(subdev);
511 struct device *dev = &client->dev;
512 u8 pmic_i2c_addr;
513
514 pmic_i2c_addr = gmin_get_pmic_id_and_addr(dev);
515 dev_info(dev, "gmin: power management provided via %s (i2c addr 0x%02x)\n",
516 pmic_name[pmic_id], pmic_i2c_addr);
517 return pmic_i2c_addr;
518 }
519
gmin_subdev_add(struct gmin_subdev * gs)520 static int gmin_subdev_add(struct gmin_subdev *gs)
521 {
522 struct i2c_client *client = v4l2_get_subdevdata(gs->subdev);
523 struct device *dev = &client->dev;
524 struct acpi_device *adev = ACPI_COMPANION(dev);
525 int ret, default_val, clock_num = -1;
526
527 dev_info(dev, "%s: ACPI path is %pfw\n", __func__, dev_fwnode(dev));
528
529 /*WA:CHT requires XTAL clock as PLL is not stable.*/
530 gs->clock_src = gmin_get_var_int(dev, false, "ClkSrc",
531 VLV2_CLK_PLL_19P2MHZ);
532
533 /*
534 * Get ACPI _PR0 derived clock here already because it is used
535 * to determine the csi_port default.
536 */
537 if (acpi_device_power_manageable(adev))
538 clock_num = atomisp_get_acpi_power(dev);
539
540 /* Compare clock to CsiPort 1 pmc-clock used in the CHT/BYT reference designs */
541 if (IS_ISP2401)
542 default_val = clock_num == 4 ? 1 : 0;
543 else
544 default_val = clock_num == 0 ? 1 : 0;
545
546 gs->csi_port = gmin_get_var_int(dev, false, "CsiPort", default_val);
547 gs->csi_lanes = gmin_get_var_int(dev, false, "CsiLanes", 1);
548
549 gs->gpio0 = gpiod_get_index(dev, NULL, 0, GPIOD_OUT_LOW);
550 if (IS_ERR(gs->gpio0))
551 gs->gpio0 = NULL;
552 else
553 dev_info(dev, "will handle gpio0 via ACPI\n");
554
555 gs->gpio1 = gpiod_get_index(dev, NULL, 1, GPIOD_OUT_LOW);
556 if (IS_ERR(gs->gpio1))
557 gs->gpio1 = NULL;
558 else
559 dev_info(dev, "will handle gpio1 via ACPI\n");
560
561 /*
562 * Those are used only when there is an external regulator apart
563 * from the PMIC that would be providing power supply, like on the
564 * two cases below:
565 *
566 * The ECS E7 board drives camera 2.8v from an external regulator
567 * instead of the PMIC. There's a gmin_CamV2P8 config variable
568 * that specifies the GPIO to handle this particular case,
569 * but this needs a broader architecture for handling camera power.
570 *
571 * The CHT RVP board drives camera 1.8v from an* external regulator
572 * instead of the PMIC just like ECS E7 board.
573 */
574
575 gs->v1p8_gpio = gmin_get_var_int(dev, true, "V1P8GPIO", -1);
576 gs->v2p8_gpio = gmin_get_var_int(dev, true, "V2P8GPIO", -1);
577
578 /*
579 * FIXME:
580 *
581 * The ACPI handling code checks for the _PR? tables in order to
582 * know what is required to switch the device from power state
583 * D0 (_PR0) up to D3COLD (_PR3).
584 *
585 * The adev->flags.power_manageable is set to true if the device
586 * has a _PR0 table, which can be checked by calling
587 * acpi_device_power_manageable(adev).
588 *
589 * However, this only says that the device can be set to power off
590 * mode.
591 *
592 * At least on the DSDT tables we've seen so far, there's no _PR3,
593 * nor _PS3 (which would have a somewhat similar effect).
594 * So, using ACPI for power management won't work, except if adding
595 * an ACPI override logic somewhere.
596 *
597 * So, at least for the existing devices we know, the check below
598 * will always be false.
599 */
600 if (acpi_device_can_wakeup(adev) &&
601 acpi_device_can_poweroff(adev)) {
602 dev_info(dev,
603 "gmin: power management provided via device PM\n");
604 return 0;
605 }
606
607 /*
608 * The code below is here due to backward compatibility with devices
609 * whose ACPI BIOS may not contain everything that would be needed
610 * in order to set clocks and do power management.
611 */
612
613 /*
614 * According with :
615 * https://github.com/projectceladon/hardware-intel-kernelflinger/blob/master/doc/fastboot.md
616 *
617 * The "CamClk" EFI var is set via fastboot on some Android devices,
618 * and seems to contain the number of the clock used to feed the
619 * sensor.
620 *
621 * On systems with a proper ACPI table, this is given via the _PR0
622 * power resource table. The logic below should first check if there
623 * is a power resource already, falling back to the EFI vars detection
624 * otherwise.
625 */
626
627 /* If getting the clock from _PR0 above failed, fall-back to EFI and/or DMI match */
628 if (clock_num < 0)
629 clock_num = gmin_get_var_int(dev, false, "CamClk", 0);
630
631 if (clock_num < 0 || clock_num > MAX_CLK_COUNT) {
632 dev_err(dev, "Invalid clock number\n");
633 return -EINVAL;
634 }
635
636 snprintf(gmin_pmc_clk_name, sizeof(gmin_pmc_clk_name),
637 "%s_%d", "pmc_plt_clk", clock_num);
638
639 gs->pmc_clk = devm_clk_get(dev, gmin_pmc_clk_name);
640 if (IS_ERR(gs->pmc_clk)) {
641 ret = PTR_ERR(gs->pmc_clk);
642 dev_err(dev, "Failed to get clk from %s: %d\n", gmin_pmc_clk_name, ret);
643 return ret;
644 }
645 dev_info(dev, "Will use CLK%d (%s)\n", clock_num, gmin_pmc_clk_name);
646
647 /*
648 * The firmware might enable the clock at
649 * boot (this information may or may not
650 * be reflected in the enable clock register).
651 * To change the rate we must disable the clock
652 * first to cover these cases. Due to common
653 * clock framework restrictions that do not allow
654 * to disable a clock that has not been enabled,
655 * we need to enable the clock first.
656 */
657 ret = clk_prepare_enable(gs->pmc_clk);
658 if (!ret)
659 clk_disable_unprepare(gs->pmc_clk);
660
661 switch (pmic_id) {
662 case PMIC_REGULATOR:
663 gs->v1p8_reg = regulator_get(dev, "V1P8SX");
664 gs->v2p8_reg = regulator_get(dev, "V2P8SX");
665
666 gs->v1p2_reg = regulator_get(dev, "V1P2A");
667 gs->v2p8_vcm_reg = regulator_get(dev, "VPROG4B");
668
669 /* Note: ideally we would initialize v[12]p8_on to the
670 * output of regulator_is_enabled(), but sadly that
671 * API is broken with the current drivers, returning
672 * "1" for a regulator that will then emit a
673 * "unbalanced disable" WARNing if we try to disable
674 * it.
675 */
676 break;
677
678 case PMIC_AXP:
679 gs->eldo1_1p6v = gmin_get_var_int(dev, false,
680 "eldo1_1p8v",
681 ELDO1_1P6V);
682 gs->eldo1_sel_reg = gmin_get_var_int(dev, false,
683 "eldo1_sel_reg",
684 ELDO1_SEL_REG);
685 gs->eldo1_ctrl_shift = gmin_get_var_int(dev, false,
686 "eldo1_ctrl_shift",
687 ELDO1_CTRL_SHIFT);
688 gs->eldo2_1p8v = gmin_get_var_int(dev, false,
689 "eldo2_1p8v",
690 ELDO2_1P8V);
691 gs->eldo2_sel_reg = gmin_get_var_int(dev, false,
692 "eldo2_sel_reg",
693 ELDO2_SEL_REG);
694 gs->eldo2_ctrl_shift = gmin_get_var_int(dev, false,
695 "eldo2_ctrl_shift",
696 ELDO2_CTRL_SHIFT);
697 break;
698
699 default:
700 break;
701 }
702
703 return 0;
704 }
705
find_gmin_subdev(struct v4l2_subdev * subdev)706 static struct gmin_subdev *find_gmin_subdev(struct v4l2_subdev *subdev)
707 {
708 int i;
709
710 for (i = 0; i < MAX_SUBDEVS; i++)
711 if (gmin_subdevs[i].subdev == subdev)
712 return &gmin_subdevs[i];
713 return NULL;
714 }
715
find_free_gmin_subdev_slot(void)716 static struct gmin_subdev *find_free_gmin_subdev_slot(void)
717 {
718 unsigned int i;
719
720 for (i = 0; i < MAX_SUBDEVS; i++)
721 if (gmin_subdevs[i].subdev == NULL)
722 return &gmin_subdevs[i];
723 return NULL;
724 }
725
axp_regulator_set(struct device * dev,struct gmin_subdev * gs,int sel_reg,u8 setting,int ctrl_reg,int shift,bool on)726 static int axp_regulator_set(struct device *dev, struct gmin_subdev *gs,
727 int sel_reg, u8 setting,
728 int ctrl_reg, int shift, bool on)
729 {
730 int ret;
731 int val;
732
733 ret = gmin_i2c_write(dev, gs->pwm_i2c_addr, sel_reg, setting, 0xff);
734 if (ret)
735 return ret;
736
737 val = on ? 1 << shift : 0;
738
739 ret = gmin_i2c_write(dev, gs->pwm_i2c_addr, ctrl_reg, val, 1 << shift);
740 if (ret)
741 return ret;
742
743 return 0;
744 }
745
746 /*
747 * Some boards contain a hw-bug where turning eldo2 back on after having turned
748 * it off causes the CPLM3218 ambient-light-sensor on the image-sensor's I2C bus
749 * to crash, hanging the bus. Do not turn eldo2 off on these systems.
750 */
751 static const struct dmi_system_id axp_leave_eldo2_on_ids[] = {
752 {
753 .matches = {
754 DMI_MATCH(DMI_SYS_VENDOR, "TrekStor"),
755 DMI_MATCH(DMI_PRODUCT_NAME, "SurfTab duo W1 10.1 (VT4)"),
756 },
757 },
758 { }
759 };
760
axp_v1p8_on(struct device * dev,struct gmin_subdev * gs)761 static int axp_v1p8_on(struct device *dev, struct gmin_subdev *gs)
762 {
763 int ret;
764
765 ret = axp_regulator_set(dev, gs, gs->eldo2_sel_reg, gs->eldo2_1p8v,
766 ELDO_CTRL_REG, gs->eldo2_ctrl_shift, true);
767 if (ret)
768 return ret;
769
770 /*
771 * This sleep comes out of the gc2235 driver, which is the
772 * only one I currently see that wants to set both 1.8v rails.
773 */
774 usleep_range(110, 150);
775
776 ret = axp_regulator_set(dev, gs, gs->eldo1_sel_reg, gs->eldo1_1p6v,
777 ELDO_CTRL_REG, gs->eldo1_ctrl_shift, true);
778 return ret;
779 }
780
axp_v1p8_off(struct device * dev,struct gmin_subdev * gs)781 static int axp_v1p8_off(struct device *dev, struct gmin_subdev *gs)
782 {
783 int ret;
784
785 ret = axp_regulator_set(dev, gs, gs->eldo1_sel_reg, gs->eldo1_1p6v,
786 ELDO_CTRL_REG, gs->eldo1_ctrl_shift, false);
787 if (ret)
788 return ret;
789
790 if (dmi_check_system(axp_leave_eldo2_on_ids))
791 return 0;
792
793 ret = axp_regulator_set(dev, gs, gs->eldo2_sel_reg, gs->eldo2_1p8v,
794 ELDO_CTRL_REG, gs->eldo2_ctrl_shift, false);
795 return ret;
796 }
797
gmin_gpio0_ctrl(struct v4l2_subdev * subdev,int on)798 static int gmin_gpio0_ctrl(struct v4l2_subdev *subdev, int on)
799 {
800 struct gmin_subdev *gs = find_gmin_subdev(subdev);
801
802 if (gs) {
803 gpiod_set_value(gs->gpio0, on);
804 return 0;
805 }
806 return -EINVAL;
807 }
808
gmin_gpio1_ctrl(struct v4l2_subdev * subdev,int on)809 static int gmin_gpio1_ctrl(struct v4l2_subdev *subdev, int on)
810 {
811 struct gmin_subdev *gs = find_gmin_subdev(subdev);
812
813 if (gs) {
814 gpiod_set_value(gs->gpio1, on);
815 return 0;
816 }
817 return -EINVAL;
818 }
819
gmin_v1p2_ctrl(struct v4l2_subdev * subdev,int on)820 static int gmin_v1p2_ctrl(struct v4l2_subdev *subdev, int on)
821 {
822 struct gmin_subdev *gs = find_gmin_subdev(subdev);
823
824 if (!gs || gs->v1p2_on == on)
825 return 0;
826 gs->v1p2_on = on;
827
828 /* use regulator for PMIC */
829 if (gs->v1p2_reg) {
830 if (on)
831 return regulator_enable(gs->v1p2_reg);
832 else
833 return regulator_disable(gs->v1p2_reg);
834 }
835
836 /* TODO:v1p2 may need to extend to other PMICs */
837
838 return -EINVAL;
839 }
840
gmin_v1p8_ctrl(struct v4l2_subdev * subdev,int on)841 static int gmin_v1p8_ctrl(struct v4l2_subdev *subdev, int on)
842 {
843 struct gmin_subdev *gs = find_gmin_subdev(subdev);
844 int ret;
845 int value;
846
847 if (!gs || gs->v1p8_on == on)
848 return 0;
849
850 if (gs->v1p8_gpio >= 0) {
851 pr_info("atomisp_gmin_platform: 1.8v power on GPIO %d\n",
852 gs->v1p8_gpio);
853 ret = gpio_request(gs->v1p8_gpio, "camera_v1p8_en");
854 if (!ret)
855 ret = gpio_direction_output(gs->v1p8_gpio, 0);
856 if (ret)
857 pr_err("V1P8 GPIO initialization failed\n");
858 }
859
860 gs->v1p8_on = on;
861
862 ret = 0;
863 mutex_lock(&gmin_regulator_mutex);
864 if (on) {
865 gmin_v1p8_enable_count++;
866 if (gmin_v1p8_enable_count > 1)
867 goto out; /* Already on */
868 } else {
869 gmin_v1p8_enable_count--;
870 if (gmin_v1p8_enable_count > 0)
871 goto out; /* Still needed */
872 }
873
874 if (gs->v1p8_gpio >= 0)
875 gpio_set_value(gs->v1p8_gpio, on);
876
877 if (gs->v1p8_reg) {
878 regulator_set_voltage(gs->v1p8_reg, 1800000, 1800000);
879 if (on)
880 ret = regulator_enable(gs->v1p8_reg);
881 else
882 ret = regulator_disable(gs->v1p8_reg);
883
884 goto out;
885 }
886
887 switch (pmic_id) {
888 case PMIC_AXP:
889 if (on)
890 ret = axp_v1p8_on(subdev->dev, gs);
891 else
892 ret = axp_v1p8_off(subdev->dev, gs);
893 break;
894 case PMIC_TI:
895 value = on ? LDO_1P8V_ON : LDO_1P8V_OFF;
896
897 ret = gmin_i2c_write(subdev->dev, gs->pwm_i2c_addr,
898 LDO10_REG, value, 0xff);
899 break;
900 case PMIC_CRYSTALCOVE:
901 value = on ? CRYSTAL_ON : CRYSTAL_OFF;
902
903 ret = gmin_i2c_write(subdev->dev, gs->pwm_i2c_addr,
904 CRYSTAL_1P8V_REG, value, 0xff);
905 break;
906 default:
907 dev_err(subdev->dev, "Couldn't set power mode for v1p8\n");
908 ret = -EINVAL;
909 }
910
911 out:
912 mutex_unlock(&gmin_regulator_mutex);
913 return ret;
914 }
915
gmin_v2p8_ctrl(struct v4l2_subdev * subdev,int on)916 static int gmin_v2p8_ctrl(struct v4l2_subdev *subdev, int on)
917 {
918 struct gmin_subdev *gs = find_gmin_subdev(subdev);
919 int ret;
920 int value;
921
922 if (WARN_ON(!gs))
923 return -ENODEV;
924
925 if (gs->v2p8_gpio >= 0) {
926 pr_info("atomisp_gmin_platform: 2.8v power on GPIO %d\n",
927 gs->v2p8_gpio);
928 ret = gpio_request(gs->v2p8_gpio, "camera_v2p8");
929 if (!ret)
930 ret = gpio_direction_output(gs->v2p8_gpio, 0);
931 if (ret)
932 pr_err("V2P8 GPIO initialization failed\n");
933 }
934
935 if (gs->v2p8_on == on)
936 return 0;
937 gs->v2p8_on = on;
938
939 ret = 0;
940 mutex_lock(&gmin_regulator_mutex);
941 if (on) {
942 gmin_v2p8_enable_count++;
943 if (gmin_v2p8_enable_count > 1)
944 goto out; /* Already on */
945 } else {
946 gmin_v2p8_enable_count--;
947 if (gmin_v2p8_enable_count > 0)
948 goto out; /* Still needed */
949 }
950
951 if (gs->v2p8_gpio >= 0)
952 gpio_set_value(gs->v2p8_gpio, on);
953
954 if (gs->v2p8_reg) {
955 regulator_set_voltage(gs->v2p8_reg, 2900000, 2900000);
956 if (on)
957 ret = regulator_enable(gs->v2p8_reg);
958 else
959 ret = regulator_disable(gs->v2p8_reg);
960
961 goto out;
962 }
963
964 switch (pmic_id) {
965 case PMIC_AXP:
966 ret = axp_regulator_set(subdev->dev, gs, ALDO1_SEL_REG,
967 ALDO1_2P8V, ALDO1_CTRL3_REG,
968 ALDO1_CTRL3_SHIFT, on);
969 break;
970 case PMIC_TI:
971 value = on ? LDO_2P8V_ON : LDO_2P8V_OFF;
972
973 ret = gmin_i2c_write(subdev->dev, gs->pwm_i2c_addr,
974 LDO9_REG, value, 0xff);
975 break;
976 case PMIC_CRYSTALCOVE:
977 value = on ? CRYSTAL_ON : CRYSTAL_OFF;
978
979 ret = gmin_i2c_write(subdev->dev, gs->pwm_i2c_addr,
980 CRYSTAL_2P8V_REG, value, 0xff);
981 break;
982 default:
983 dev_err(subdev->dev, "Couldn't set power mode for v2p8\n");
984 ret = -EINVAL;
985 }
986
987 out:
988 mutex_unlock(&gmin_regulator_mutex);
989 return ret;
990 }
991
gmin_acpi_pm_ctrl(struct v4l2_subdev * subdev,int on)992 static int gmin_acpi_pm_ctrl(struct v4l2_subdev *subdev, int on)
993 {
994 int ret = 0;
995 struct gmin_subdev *gs = find_gmin_subdev(subdev);
996 struct i2c_client *client = v4l2_get_subdevdata(subdev);
997 struct acpi_device *adev = ACPI_COMPANION(&client->dev);
998
999 /* Use the ACPI power management to control it */
1000 on = !!on;
1001 if (gs->clock_on == on)
1002 return 0;
1003
1004 dev_dbg(subdev->dev, "Setting power state to %s\n",
1005 on ? "on" : "off");
1006
1007 if (on)
1008 ret = acpi_device_set_power(adev,
1009 ACPI_STATE_D0);
1010 else
1011 ret = acpi_device_set_power(adev,
1012 ACPI_STATE_D3_COLD);
1013
1014 if (!ret)
1015 gs->clock_on = on;
1016 else
1017 dev_err(subdev->dev, "Couldn't set power state to %s\n",
1018 on ? "on" : "off");
1019
1020 return ret;
1021 }
1022
gmin_flisclk_ctrl(struct v4l2_subdev * subdev,int on)1023 static int gmin_flisclk_ctrl(struct v4l2_subdev *subdev, int on)
1024 {
1025 int ret = 0;
1026 struct gmin_subdev *gs = find_gmin_subdev(subdev);
1027 struct i2c_client *client = v4l2_get_subdevdata(subdev);
1028
1029 if (gs->clock_on == !!on)
1030 return 0;
1031
1032 if (on) {
1033 ret = clk_set_rate(gs->pmc_clk,
1034 gs->clock_src ? CLK_RATE_19_2MHZ : CLK_RATE_25_0MHZ);
1035
1036 if (ret)
1037 dev_err(&client->dev, "unable to set PMC rate %d\n",
1038 gs->clock_src);
1039
1040 ret = clk_prepare_enable(gs->pmc_clk);
1041 if (ret == 0)
1042 gs->clock_on = true;
1043 } else {
1044 clk_disable_unprepare(gs->pmc_clk);
1045 gs->clock_on = false;
1046 }
1047
1048 return ret;
1049 }
1050
camera_sensor_csi_alloc(struct v4l2_subdev * sd,u32 port,u32 lanes,u32 format,u32 bayer_order)1051 static int camera_sensor_csi_alloc(struct v4l2_subdev *sd, u32 port, u32 lanes,
1052 u32 format, u32 bayer_order)
1053 {
1054 struct i2c_client *client = v4l2_get_subdevdata(sd);
1055 struct camera_mipi_info *csi;
1056
1057 csi = kzalloc(sizeof(*csi), GFP_KERNEL);
1058 if (!csi)
1059 return -ENOMEM;
1060
1061 csi->port = port;
1062 csi->num_lanes = lanes;
1063 csi->input_format = format;
1064 csi->raw_bayer_order = bayer_order;
1065 v4l2_set_subdev_hostdata(sd, csi);
1066 csi->metadata_format = ATOMISP_INPUT_FORMAT_EMBEDDED;
1067 csi->metadata_effective_width = NULL;
1068 dev_info(&client->dev,
1069 "camera pdata: port: %d lanes: %d order: %8.8x\n",
1070 port, lanes, bayer_order);
1071
1072 return 0;
1073 }
1074
camera_sensor_csi_free(struct v4l2_subdev * sd)1075 static void camera_sensor_csi_free(struct v4l2_subdev *sd)
1076 {
1077 struct camera_mipi_info *csi;
1078
1079 csi = v4l2_get_subdev_hostdata(sd);
1080 kfree(csi);
1081 }
1082
gmin_csi_cfg(struct v4l2_subdev * sd,int flag)1083 static int gmin_csi_cfg(struct v4l2_subdev *sd, int flag)
1084 {
1085 struct i2c_client *client = v4l2_get_subdevdata(sd);
1086 struct gmin_subdev *gs = find_gmin_subdev(sd);
1087
1088 if (!client || !gs)
1089 return -ENODEV;
1090
1091 if (flag)
1092 return camera_sensor_csi_alloc(sd, gs->csi_port, gs->csi_lanes,
1093 gs->csi_fmt, gs->csi_bayer);
1094 camera_sensor_csi_free(sd);
1095 return 0;
1096 }
1097
gmin_get_vcm_ctrl(struct v4l2_subdev * subdev,char * camera_module)1098 static struct camera_vcm_control *gmin_get_vcm_ctrl(struct v4l2_subdev *subdev,
1099 char *camera_module)
1100 {
1101 struct i2c_client *client = v4l2_get_subdevdata(subdev);
1102 struct gmin_subdev *gs = find_gmin_subdev(subdev);
1103 struct camera_vcm_control *vcm;
1104
1105 if (!client || !gs)
1106 return NULL;
1107
1108 if (!camera_module)
1109 return NULL;
1110
1111 mutex_lock(&vcm_lock);
1112 list_for_each_entry(vcm, &vcm_devices, list) {
1113 if (!strcmp(camera_module, vcm->camera_module)) {
1114 mutex_unlock(&vcm_lock);
1115 return vcm;
1116 }
1117 }
1118
1119 mutex_unlock(&vcm_lock);
1120 return NULL;
1121 }
1122
1123 static struct camera_sensor_platform_data pmic_gmin_plat = {
1124 .gpio0_ctrl = gmin_gpio0_ctrl,
1125 .gpio1_ctrl = gmin_gpio1_ctrl,
1126 .v1p8_ctrl = gmin_v1p8_ctrl,
1127 .v2p8_ctrl = gmin_v2p8_ctrl,
1128 .v1p2_ctrl = gmin_v1p2_ctrl,
1129 .flisclk_ctrl = gmin_flisclk_ctrl,
1130 .csi_cfg = gmin_csi_cfg,
1131 .get_vcm_ctrl = gmin_get_vcm_ctrl,
1132 };
1133
1134 static struct camera_sensor_platform_data acpi_gmin_plat = {
1135 .gpio0_ctrl = gmin_gpio0_ctrl,
1136 .gpio1_ctrl = gmin_gpio1_ctrl,
1137 .v1p8_ctrl = gmin_acpi_pm_ctrl,
1138 .v2p8_ctrl = gmin_acpi_pm_ctrl,
1139 .v1p2_ctrl = gmin_acpi_pm_ctrl,
1140 .flisclk_ctrl = gmin_acpi_pm_ctrl,
1141 .csi_cfg = gmin_csi_cfg,
1142 .get_vcm_ctrl = gmin_get_vcm_ctrl,
1143 };
1144
1145 struct camera_sensor_platform_data *
gmin_camera_platform_data(struct v4l2_subdev * subdev,enum atomisp_input_format csi_format,enum atomisp_bayer_order csi_bayer)1146 gmin_camera_platform_data(struct v4l2_subdev *subdev,
1147 enum atomisp_input_format csi_format,
1148 enum atomisp_bayer_order csi_bayer)
1149 {
1150 u8 pmic_i2c_addr = gmin_detect_pmic(subdev);
1151 struct gmin_subdev *gs;
1152
1153 gs = find_free_gmin_subdev_slot();
1154 gs->subdev = subdev;
1155 gs->csi_fmt = csi_format;
1156 gs->csi_bayer = csi_bayer;
1157 gs->pwm_i2c_addr = pmic_i2c_addr;
1158
1159 gmin_subdev_add(gs);
1160 if (gs->pmc_clk)
1161 return &pmic_gmin_plat;
1162 else
1163 return &acpi_gmin_plat;
1164 }
1165 EXPORT_SYMBOL_GPL(gmin_camera_platform_data);
1166
atomisp_gmin_register_vcm_control(struct camera_vcm_control * vcmCtrl)1167 int atomisp_gmin_register_vcm_control(struct camera_vcm_control *vcmCtrl)
1168 {
1169 if (!vcmCtrl)
1170 return -EINVAL;
1171
1172 mutex_lock(&vcm_lock);
1173 list_add_tail(&vcmCtrl->list, &vcm_devices);
1174 mutex_unlock(&vcm_lock);
1175
1176 return 0;
1177 }
1178 EXPORT_SYMBOL_GPL(atomisp_gmin_register_vcm_control);
1179
gmin_get_hardcoded_var(struct device * dev,struct gmin_cfg_var * varlist,const char * var8,char * out,size_t * out_len)1180 static int gmin_get_hardcoded_var(struct device *dev,
1181 struct gmin_cfg_var *varlist,
1182 const char *var8, char *out, size_t *out_len)
1183 {
1184 struct gmin_cfg_var *gv;
1185
1186 for (gv = varlist; gv->name; gv++) {
1187 size_t vl;
1188
1189 if (strcmp(var8, gv->name))
1190 continue;
1191
1192 dev_info(dev, "Found DMI entry for '%s'\n", var8);
1193
1194 vl = strlen(gv->val);
1195 if (vl > *out_len - 1)
1196 return -ENOSPC;
1197
1198 strscpy(out, gv->val, *out_len);
1199 *out_len = vl;
1200 return 0;
1201 }
1202
1203 return -EINVAL;
1204 }
1205
1206
gmin_get_config_dsm_var(struct device * dev,const char * var,char * out,size_t * out_len)1207 static int gmin_get_config_dsm_var(struct device *dev,
1208 const char *var,
1209 char *out, size_t *out_len)
1210 {
1211 acpi_handle handle = ACPI_HANDLE(dev);
1212 union acpi_object *obj, *cur = NULL;
1213 int i;
1214
1215 /*
1216 * The data reported by "CamClk" seems to be either 0 or 1 at the
1217 * _DSM table.
1218 *
1219 * At the ACPI tables we looked so far, this is not related to the
1220 * actual clock source for the sensor, which is given by the
1221 * _PR0 ACPI table. So, ignore it, as otherwise this will be
1222 * set to a wrong value.
1223 */
1224 if (!strcmp(var, "CamClk"))
1225 return -EINVAL;
1226
1227 /* Return on unexpected object type */
1228 obj = acpi_evaluate_dsm_typed(handle, &atomisp_dsm_guid, 0, 0, NULL,
1229 ACPI_TYPE_PACKAGE);
1230 if (!obj) {
1231 dev_info_once(dev, "Didn't find ACPI _DSM table.\n");
1232 return -EINVAL;
1233 }
1234
1235 #if 0 /* Just for debugging purposes */
1236 for (i = 0; i < obj->package.count; i++) {
1237 union acpi_object *cur = &obj->package.elements[i];
1238
1239 if (cur->type == ACPI_TYPE_INTEGER)
1240 dev_info(dev, "object #%d, type %d, value: %lld\n",
1241 i, cur->type, cur->integer.value);
1242 else if (cur->type == ACPI_TYPE_STRING)
1243 dev_info(dev, "object #%d, type %d, string: %s\n",
1244 i, cur->type, cur->string.pointer);
1245 else
1246 dev_info(dev, "object #%d, type %d\n",
1247 i, cur->type);
1248 }
1249 #endif
1250
1251 /* Seek for the desired var */
1252 for (i = 0; i < obj->package.count - 1; i += 2) {
1253 if (obj->package.elements[i].type == ACPI_TYPE_STRING &&
1254 !strcmp(obj->package.elements[i].string.pointer, var)) {
1255 /* Next element should be the required value */
1256 cur = &obj->package.elements[i + 1];
1257 break;
1258 }
1259 }
1260
1261 if (!cur) {
1262 dev_info(dev, "didn't found _DSM entry for '%s'\n", var);
1263 ACPI_FREE(obj);
1264 return -EINVAL;
1265 }
1266
1267 /*
1268 * While it could be possible to have an ACPI_TYPE_INTEGER,
1269 * and read the value from cur->integer.value, the table
1270 * seen so far uses the string type. So, produce a warning
1271 * if it founds something different than string, letting it
1272 * to fall back to the old code.
1273 */
1274 if (cur && cur->type != ACPI_TYPE_STRING) {
1275 dev_info(dev, "found non-string _DSM entry for '%s'\n", var);
1276 ACPI_FREE(obj);
1277 return -EINVAL;
1278 }
1279
1280 dev_info(dev, "found _DSM entry for '%s': %s\n", var,
1281 cur->string.pointer);
1282 strscpy(out, cur->string.pointer, *out_len);
1283 *out_len = strlen(cur->string.pointer);
1284
1285 ACPI_FREE(obj);
1286 return 0;
1287 }
1288
1289 /* Retrieves a device-specific configuration variable. The dev
1290 * argument should be a device with an ACPI companion, as all
1291 * configuration is based on firmware ID.
1292 */
gmin_get_config_var(struct device * maindev,bool is_gmin,const char * var,char * out,size_t * out_len)1293 static int gmin_get_config_var(struct device *maindev,
1294 bool is_gmin,
1295 const char *var,
1296 char *out, size_t *out_len)
1297 {
1298 efi_char16_t var16[CFG_VAR_NAME_MAX];
1299 const struct dmi_system_id *id;
1300 struct device *dev = maindev;
1301 char var8[CFG_VAR_NAME_MAX];
1302 efi_status_t status;
1303 int i, ret;
1304
1305 /* For sensors, try first to use the _DSM table */
1306 if (!is_gmin) {
1307 ret = gmin_get_config_dsm_var(maindev, var, out, out_len);
1308 if (!ret)
1309 return 0;
1310 }
1311
1312 /* Fall-back to other approaches */
1313
1314 if (!is_gmin && ACPI_COMPANION(dev))
1315 dev = &ACPI_COMPANION(dev)->dev;
1316
1317 if (!is_gmin)
1318 ret = snprintf(var8, sizeof(var8), "%s_%s", dev_name(dev), var);
1319 else
1320 ret = snprintf(var8, sizeof(var8), "gmin_%s", var);
1321
1322 if (ret < 0 || ret >= sizeof(var8) - 1)
1323 return -EINVAL;
1324
1325 /* First check a hard-coded list of board-specific variables.
1326 * Some device firmwares lack the ability to set EFI variables at
1327 * runtime.
1328 */
1329 id = dmi_first_match(gmin_vars);
1330 if (id) {
1331 ret = gmin_get_hardcoded_var(maindev, id->driver_data, var8,
1332 out, out_len);
1333 if (!ret)
1334 return 0;
1335 }
1336
1337 /* Our variable names are ASCII by construction, but EFI names
1338 * are wide chars. Convert and zero-pad.
1339 */
1340 memset(var16, 0, sizeof(var16));
1341 for (i = 0; i < sizeof(var8) && var8[i]; i++)
1342 var16[i] = var8[i];
1343
1344 status = EFI_UNSUPPORTED;
1345 if (efi_rt_services_supported(EFI_RT_SUPPORTED_GET_VARIABLE))
1346 status = efi.get_variable(var16, &GMIN_CFG_VAR_EFI_GUID, NULL,
1347 (unsigned long *)out_len, out);
1348 if (status == EFI_SUCCESS) {
1349 dev_info(maindev, "found EFI entry for '%s'\n", var8);
1350 } else if (is_gmin) {
1351 dev_info(maindev, "Failed to find EFI gmin variable %s\n", var8);
1352 } else {
1353 dev_info(maindev, "Failed to find EFI variable %s\n", var8);
1354 }
1355
1356 return ret;
1357 }
1358
gmin_get_var_int(struct device * dev,bool is_gmin,const char * var,int def)1359 int gmin_get_var_int(struct device *dev, bool is_gmin, const char *var, int def)
1360 {
1361 char val[CFG_VAR_NAME_MAX];
1362 size_t len = sizeof(val);
1363 long result;
1364 int ret;
1365
1366 ret = gmin_get_config_var(dev, is_gmin, var, val, &len);
1367 if (!ret) {
1368 val[len] = 0;
1369 ret = kstrtol(val, 0, &result);
1370 } else {
1371 dev_info(dev, "%s: using default (%d)\n", var, def);
1372 }
1373
1374 return ret ? def : result;
1375 }
1376 EXPORT_SYMBOL_GPL(gmin_get_var_int);
1377
1378 /* PCI quirk: The BYT ISP advertises PCI runtime PM but it doesn't
1379 * work. Disable so the kernel framework doesn't hang the device
1380 * trying. The driver itself does direct calls to the PUNIT to manage
1381 * ISP power.
1382 */
isp_pm_cap_fixup(struct pci_dev * pdev)1383 static void isp_pm_cap_fixup(struct pci_dev *pdev)
1384 {
1385 dev_info(&pdev->dev, "Disabling PCI power management on camera ISP\n");
1386 pdev->pm_cap = 0;
1387 }
1388 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x0f38, isp_pm_cap_fixup);
1389
1390 MODULE_DESCRIPTION("Ancillary routines for binding ACPI devices");
1391 MODULE_LICENSE("GPL");
1392