Courtney Cavin | 93c64f1 | 2015-03-12 08:47:08 -0700 | [diff] [blame] | 1 | /* Copyright (c) 2015, Sony Mobile Communications, AB. |
| 2 | * |
| 3 | * This program is free software; you can redistribute it and/or modify |
| 4 | * it under the terms of the GNU General Public License version 2 and |
| 5 | * only version 2 as published by the Free Software Foundation. |
| 6 | * |
| 7 | * This program is distributed in the hope that it will be useful, |
| 8 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 9 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 10 | * GNU General Public License for more details. |
| 11 | */ |
| 12 | |
| 13 | #include <linux/kernel.h> |
Bjorn Andersson | 7ddbc24 | 2015-07-21 17:44:49 -0700 | [diff] [blame] | 14 | #include <linux/backlight.h> |
Courtney Cavin | 93c64f1 | 2015-03-12 08:47:08 -0700 | [diff] [blame] | 15 | #include <linux/module.h> |
| 16 | #include <linux/of.h> |
| 17 | #include <linux/of_device.h> |
| 18 | #include <linux/regmap.h> |
| 19 | |
| 20 | #define PM8941_WLED_REG_VAL_BASE 0x40 |
| 21 | #define PM8941_WLED_REG_VAL_MAX 0xFFF |
| 22 | |
| 23 | #define PM8941_WLED_REG_MOD_EN 0x46 |
| 24 | #define PM8941_WLED_REG_MOD_EN_BIT BIT(7) |
| 25 | #define PM8941_WLED_REG_MOD_EN_MASK BIT(7) |
| 26 | |
| 27 | #define PM8941_WLED_REG_SYNC 0x47 |
| 28 | #define PM8941_WLED_REG_SYNC_MASK 0x07 |
| 29 | #define PM8941_WLED_REG_SYNC_LED1 BIT(0) |
| 30 | #define PM8941_WLED_REG_SYNC_LED2 BIT(1) |
| 31 | #define PM8941_WLED_REG_SYNC_LED3 BIT(2) |
| 32 | #define PM8941_WLED_REG_SYNC_ALL 0x07 |
| 33 | #define PM8941_WLED_REG_SYNC_CLEAR 0x00 |
| 34 | |
| 35 | #define PM8941_WLED_REG_FREQ 0x4c |
| 36 | #define PM8941_WLED_REG_FREQ_MASK 0x0f |
| 37 | |
| 38 | #define PM8941_WLED_REG_OVP 0x4d |
| 39 | #define PM8941_WLED_REG_OVP_MASK 0x03 |
| 40 | |
| 41 | #define PM8941_WLED_REG_BOOST 0x4e |
| 42 | #define PM8941_WLED_REG_BOOST_MASK 0x07 |
| 43 | |
| 44 | #define PM8941_WLED_REG_SINK 0x4f |
| 45 | #define PM8941_WLED_REG_SINK_MASK 0xe0 |
| 46 | #define PM8941_WLED_REG_SINK_SHFT 0x05 |
| 47 | |
| 48 | /* Per-'string' registers below */ |
| 49 | #define PM8941_WLED_REG_STR_OFFSET 0x10 |
| 50 | |
| 51 | #define PM8941_WLED_REG_STR_MOD_EN_BASE 0x60 |
| 52 | #define PM8941_WLED_REG_STR_MOD_MASK BIT(7) |
| 53 | #define PM8941_WLED_REG_STR_MOD_EN BIT(7) |
| 54 | |
| 55 | #define PM8941_WLED_REG_STR_SCALE_BASE 0x62 |
| 56 | #define PM8941_WLED_REG_STR_SCALE_MASK 0x1f |
| 57 | |
| 58 | #define PM8941_WLED_REG_STR_MOD_SRC_BASE 0x63 |
| 59 | #define PM8941_WLED_REG_STR_MOD_SRC_MASK 0x01 |
| 60 | #define PM8941_WLED_REG_STR_MOD_SRC_INT 0x00 |
| 61 | #define PM8941_WLED_REG_STR_MOD_SRC_EXT 0x01 |
| 62 | |
| 63 | #define PM8941_WLED_REG_STR_CABC_BASE 0x66 |
| 64 | #define PM8941_WLED_REG_STR_CABC_MASK BIT(7) |
| 65 | #define PM8941_WLED_REG_STR_CABC_EN BIT(7) |
| 66 | |
| 67 | struct pm8941_wled_config { |
| 68 | u32 i_boost_limit; |
| 69 | u32 ovp; |
| 70 | u32 switch_freq; |
| 71 | u32 num_strings; |
| 72 | u32 i_limit; |
| 73 | bool cs_out_en; |
| 74 | bool ext_gen; |
| 75 | bool cabc_en; |
| 76 | }; |
| 77 | |
| 78 | struct pm8941_wled { |
Bjorn Andersson | 7ddbc24 | 2015-07-21 17:44:49 -0700 | [diff] [blame] | 79 | const char *name; |
Courtney Cavin | 93c64f1 | 2015-03-12 08:47:08 -0700 | [diff] [blame] | 80 | struct regmap *regmap; |
| 81 | u16 addr; |
| 82 | |
Courtney Cavin | 93c64f1 | 2015-03-12 08:47:08 -0700 | [diff] [blame] | 83 | struct pm8941_wled_config cfg; |
| 84 | }; |
| 85 | |
Bjorn Andersson | 7ddbc24 | 2015-07-21 17:44:49 -0700 | [diff] [blame] | 86 | static int pm8941_wled_update_status(struct backlight_device *bl) |
Courtney Cavin | 93c64f1 | 2015-03-12 08:47:08 -0700 | [diff] [blame] | 87 | { |
Bjorn Andersson | 7ddbc24 | 2015-07-21 17:44:49 -0700 | [diff] [blame] | 88 | struct pm8941_wled *wled = bl_get_data(bl); |
| 89 | u16 val = bl->props.brightness; |
Courtney Cavin | 93c64f1 | 2015-03-12 08:47:08 -0700 | [diff] [blame] | 90 | u8 ctrl = 0; |
Courtney Cavin | 93c64f1 | 2015-03-12 08:47:08 -0700 | [diff] [blame] | 91 | int rc; |
| 92 | int i; |
| 93 | |
Bjorn Andersson | 7ddbc24 | 2015-07-21 17:44:49 -0700 | [diff] [blame] | 94 | if (bl->props.power != FB_BLANK_UNBLANK || |
| 95 | bl->props.fb_blank != FB_BLANK_UNBLANK || |
| 96 | bl->props.state & BL_CORE_FBBLANK) |
| 97 | val = 0; |
Courtney Cavin | 93c64f1 | 2015-03-12 08:47:08 -0700 | [diff] [blame] | 98 | |
Bjorn Andersson | 7ddbc24 | 2015-07-21 17:44:49 -0700 | [diff] [blame] | 99 | if (val != 0) |
Courtney Cavin | 93c64f1 | 2015-03-12 08:47:08 -0700 | [diff] [blame] | 100 | ctrl = PM8941_WLED_REG_MOD_EN_BIT; |
| 101 | |
Courtney Cavin | 93c64f1 | 2015-03-12 08:47:08 -0700 | [diff] [blame] | 102 | rc = regmap_update_bits(wled->regmap, |
| 103 | wled->addr + PM8941_WLED_REG_MOD_EN, |
| 104 | PM8941_WLED_REG_MOD_EN_MASK, ctrl); |
| 105 | if (rc) |
| 106 | return rc; |
| 107 | |
| 108 | for (i = 0; i < wled->cfg.num_strings; ++i) { |
| 109 | u8 v[2] = { val & 0xff, (val >> 8) & 0xf }; |
| 110 | |
| 111 | rc = regmap_bulk_write(wled->regmap, |
| 112 | wled->addr + PM8941_WLED_REG_VAL_BASE + 2 * i, |
| 113 | v, 2); |
| 114 | if (rc) |
| 115 | return rc; |
| 116 | } |
| 117 | |
| 118 | rc = regmap_update_bits(wled->regmap, |
| 119 | wled->addr + PM8941_WLED_REG_SYNC, |
| 120 | PM8941_WLED_REG_SYNC_MASK, PM8941_WLED_REG_SYNC_ALL); |
| 121 | if (rc) |
| 122 | return rc; |
| 123 | |
| 124 | rc = regmap_update_bits(wled->regmap, |
| 125 | wled->addr + PM8941_WLED_REG_SYNC, |
| 126 | PM8941_WLED_REG_SYNC_MASK, PM8941_WLED_REG_SYNC_CLEAR); |
| 127 | return rc; |
| 128 | } |
| 129 | |
Courtney Cavin | 93c64f1 | 2015-03-12 08:47:08 -0700 | [diff] [blame] | 130 | static int pm8941_wled_setup(struct pm8941_wled *wled) |
| 131 | { |
| 132 | int rc; |
| 133 | int i; |
| 134 | |
| 135 | rc = regmap_update_bits(wled->regmap, |
| 136 | wled->addr + PM8941_WLED_REG_OVP, |
| 137 | PM8941_WLED_REG_OVP_MASK, wled->cfg.ovp); |
| 138 | if (rc) |
| 139 | return rc; |
| 140 | |
| 141 | rc = regmap_update_bits(wled->regmap, |
| 142 | wled->addr + PM8941_WLED_REG_BOOST, |
| 143 | PM8941_WLED_REG_BOOST_MASK, wled->cfg.i_boost_limit); |
| 144 | if (rc) |
| 145 | return rc; |
| 146 | |
| 147 | rc = regmap_update_bits(wled->regmap, |
| 148 | wled->addr + PM8941_WLED_REG_FREQ, |
| 149 | PM8941_WLED_REG_FREQ_MASK, wled->cfg.switch_freq); |
| 150 | if (rc) |
| 151 | return rc; |
| 152 | |
| 153 | if (wled->cfg.cs_out_en) { |
| 154 | u8 all = (BIT(wled->cfg.num_strings) - 1) |
| 155 | << PM8941_WLED_REG_SINK_SHFT; |
| 156 | |
| 157 | rc = regmap_update_bits(wled->regmap, |
| 158 | wled->addr + PM8941_WLED_REG_SINK, |
| 159 | PM8941_WLED_REG_SINK_MASK, all); |
| 160 | if (rc) |
| 161 | return rc; |
| 162 | } |
| 163 | |
| 164 | for (i = 0; i < wled->cfg.num_strings; ++i) { |
| 165 | u16 addr = wled->addr + PM8941_WLED_REG_STR_OFFSET * i; |
| 166 | |
| 167 | rc = regmap_update_bits(wled->regmap, |
| 168 | addr + PM8941_WLED_REG_STR_MOD_EN_BASE, |
| 169 | PM8941_WLED_REG_STR_MOD_MASK, |
| 170 | PM8941_WLED_REG_STR_MOD_EN); |
| 171 | if (rc) |
| 172 | return rc; |
| 173 | |
| 174 | if (wled->cfg.ext_gen) { |
| 175 | rc = regmap_update_bits(wled->regmap, |
| 176 | addr + PM8941_WLED_REG_STR_MOD_SRC_BASE, |
| 177 | PM8941_WLED_REG_STR_MOD_SRC_MASK, |
| 178 | PM8941_WLED_REG_STR_MOD_SRC_EXT); |
| 179 | if (rc) |
| 180 | return rc; |
| 181 | } |
| 182 | |
| 183 | rc = regmap_update_bits(wled->regmap, |
| 184 | addr + PM8941_WLED_REG_STR_SCALE_BASE, |
| 185 | PM8941_WLED_REG_STR_SCALE_MASK, |
| 186 | wled->cfg.i_limit); |
| 187 | if (rc) |
| 188 | return rc; |
| 189 | |
| 190 | rc = regmap_update_bits(wled->regmap, |
| 191 | addr + PM8941_WLED_REG_STR_CABC_BASE, |
| 192 | PM8941_WLED_REG_STR_CABC_MASK, |
| 193 | wled->cfg.cabc_en ? |
| 194 | PM8941_WLED_REG_STR_CABC_EN : 0); |
| 195 | if (rc) |
| 196 | return rc; |
| 197 | } |
| 198 | |
| 199 | return 0; |
| 200 | } |
| 201 | |
| 202 | static const struct pm8941_wled_config pm8941_wled_config_defaults = { |
| 203 | .i_boost_limit = 3, |
| 204 | .i_limit = 20, |
| 205 | .ovp = 2, |
| 206 | .switch_freq = 5, |
| 207 | .num_strings = 0, |
| 208 | .cs_out_en = false, |
| 209 | .ext_gen = false, |
| 210 | .cabc_en = false, |
| 211 | }; |
| 212 | |
| 213 | struct pm8941_wled_var_cfg { |
| 214 | const u32 *values; |
| 215 | u32 (*fn)(u32); |
| 216 | int size; |
| 217 | }; |
| 218 | |
| 219 | static const u32 pm8941_wled_i_boost_limit_values[] = { |
| 220 | 105, 385, 525, 805, 980, 1260, 1400, 1680, |
| 221 | }; |
| 222 | |
| 223 | static const struct pm8941_wled_var_cfg pm8941_wled_i_boost_limit_cfg = { |
| 224 | .values = pm8941_wled_i_boost_limit_values, |
| 225 | .size = ARRAY_SIZE(pm8941_wled_i_boost_limit_values), |
| 226 | }; |
| 227 | |
| 228 | static const u32 pm8941_wled_ovp_values[] = { |
| 229 | 35, 32, 29, 27, |
| 230 | }; |
| 231 | |
| 232 | static const struct pm8941_wled_var_cfg pm8941_wled_ovp_cfg = { |
| 233 | .values = pm8941_wled_ovp_values, |
| 234 | .size = ARRAY_SIZE(pm8941_wled_ovp_values), |
| 235 | }; |
| 236 | |
| 237 | static u32 pm8941_wled_num_strings_values_fn(u32 idx) |
| 238 | { |
| 239 | return idx + 1; |
| 240 | } |
| 241 | |
| 242 | static const struct pm8941_wled_var_cfg pm8941_wled_num_strings_cfg = { |
| 243 | .fn = pm8941_wled_num_strings_values_fn, |
| 244 | .size = 3, |
| 245 | }; |
| 246 | |
| 247 | static u32 pm8941_wled_switch_freq_values_fn(u32 idx) |
| 248 | { |
| 249 | return 19200 / (2 * (1 + idx)); |
| 250 | } |
| 251 | |
| 252 | static const struct pm8941_wled_var_cfg pm8941_wled_switch_freq_cfg = { |
| 253 | .fn = pm8941_wled_switch_freq_values_fn, |
| 254 | .size = 16, |
| 255 | }; |
| 256 | |
| 257 | static const struct pm8941_wled_var_cfg pm8941_wled_i_limit_cfg = { |
| 258 | .size = 26, |
| 259 | }; |
| 260 | |
| 261 | static u32 pm8941_wled_values(const struct pm8941_wled_var_cfg *cfg, u32 idx) |
| 262 | { |
| 263 | if (idx >= cfg->size) |
| 264 | return UINT_MAX; |
| 265 | if (cfg->fn) |
| 266 | return cfg->fn(idx); |
| 267 | if (cfg->values) |
| 268 | return cfg->values[idx]; |
| 269 | return idx; |
| 270 | } |
| 271 | |
| 272 | static int pm8941_wled_configure(struct pm8941_wled *wled, struct device *dev) |
| 273 | { |
| 274 | struct pm8941_wled_config *cfg = &wled->cfg; |
| 275 | u32 val; |
| 276 | int rc; |
| 277 | u32 c; |
| 278 | int i; |
| 279 | int j; |
| 280 | |
| 281 | const struct { |
| 282 | const char *name; |
| 283 | u32 *val_ptr; |
| 284 | const struct pm8941_wled_var_cfg *cfg; |
| 285 | } u32_opts[] = { |
| 286 | { |
| 287 | "qcom,current-boost-limit", |
| 288 | &cfg->i_boost_limit, |
| 289 | .cfg = &pm8941_wled_i_boost_limit_cfg, |
| 290 | }, |
| 291 | { |
| 292 | "qcom,current-limit", |
| 293 | &cfg->i_limit, |
| 294 | .cfg = &pm8941_wled_i_limit_cfg, |
| 295 | }, |
| 296 | { |
| 297 | "qcom,ovp", |
| 298 | &cfg->ovp, |
| 299 | .cfg = &pm8941_wled_ovp_cfg, |
| 300 | }, |
| 301 | { |
| 302 | "qcom,switching-freq", |
| 303 | &cfg->switch_freq, |
| 304 | .cfg = &pm8941_wled_switch_freq_cfg, |
| 305 | }, |
| 306 | { |
| 307 | "qcom,num-strings", |
| 308 | &cfg->num_strings, |
| 309 | .cfg = &pm8941_wled_num_strings_cfg, |
| 310 | }, |
| 311 | }; |
| 312 | const struct { |
| 313 | const char *name; |
| 314 | bool *val_ptr; |
| 315 | } bool_opts[] = { |
| 316 | { "qcom,cs-out", &cfg->cs_out_en, }, |
| 317 | { "qcom,ext-gen", &cfg->ext_gen, }, |
| 318 | { "qcom,cabc", &cfg->cabc_en, }, |
| 319 | }; |
| 320 | |
| 321 | rc = of_property_read_u32(dev->of_node, "reg", &val); |
| 322 | if (rc || val > 0xffff) { |
| 323 | dev_err(dev, "invalid IO resources\n"); |
| 324 | return rc ? rc : -EINVAL; |
| 325 | } |
| 326 | wled->addr = val; |
| 327 | |
Bjorn Andersson | 7ddbc24 | 2015-07-21 17:44:49 -0700 | [diff] [blame] | 328 | rc = of_property_read_string(dev->of_node, "label", &wled->name); |
Courtney Cavin | 93c64f1 | 2015-03-12 08:47:08 -0700 | [diff] [blame] | 329 | if (rc) |
Bjorn Andersson | 7ddbc24 | 2015-07-21 17:44:49 -0700 | [diff] [blame] | 330 | wled->name = dev->of_node->name; |
Courtney Cavin | 93c64f1 | 2015-03-12 08:47:08 -0700 | [diff] [blame] | 331 | |
| 332 | *cfg = pm8941_wled_config_defaults; |
| 333 | for (i = 0; i < ARRAY_SIZE(u32_opts); ++i) { |
| 334 | rc = of_property_read_u32(dev->of_node, u32_opts[i].name, &val); |
| 335 | if (rc == -EINVAL) { |
| 336 | continue; |
| 337 | } else if (rc) { |
| 338 | dev_err(dev, "error reading '%s'\n", u32_opts[i].name); |
| 339 | return rc; |
| 340 | } |
| 341 | |
| 342 | c = UINT_MAX; |
| 343 | for (j = 0; c != val; j++) { |
| 344 | c = pm8941_wled_values(u32_opts[i].cfg, j); |
| 345 | if (c == UINT_MAX) { |
| 346 | dev_err(dev, "invalid value for '%s'\n", |
| 347 | u32_opts[i].name); |
| 348 | return -EINVAL; |
| 349 | } |
| 350 | } |
| 351 | |
| 352 | dev_dbg(dev, "'%s' = %u\n", u32_opts[i].name, c); |
| 353 | *u32_opts[i].val_ptr = j; |
| 354 | } |
| 355 | |
| 356 | for (i = 0; i < ARRAY_SIZE(bool_opts); ++i) { |
| 357 | if (of_property_read_bool(dev->of_node, bool_opts[i].name)) |
| 358 | *bool_opts[i].val_ptr = true; |
| 359 | } |
| 360 | |
| 361 | cfg->num_strings = cfg->num_strings + 1; |
| 362 | |
| 363 | return 0; |
| 364 | } |
| 365 | |
Bjorn Andersson | 7ddbc24 | 2015-07-21 17:44:49 -0700 | [diff] [blame] | 366 | static const struct backlight_ops pm8941_wled_ops = { |
| 367 | .update_status = pm8941_wled_update_status, |
| 368 | }; |
| 369 | |
Courtney Cavin | 93c64f1 | 2015-03-12 08:47:08 -0700 | [diff] [blame] | 370 | static int pm8941_wled_probe(struct platform_device *pdev) |
| 371 | { |
Bjorn Andersson | 7ddbc24 | 2015-07-21 17:44:49 -0700 | [diff] [blame] | 372 | struct backlight_properties props; |
| 373 | struct backlight_device *bl; |
Courtney Cavin | 93c64f1 | 2015-03-12 08:47:08 -0700 | [diff] [blame] | 374 | struct pm8941_wled *wled; |
| 375 | struct regmap *regmap; |
| 376 | int rc; |
| 377 | |
| 378 | regmap = dev_get_regmap(pdev->dev.parent, NULL); |
| 379 | if (!regmap) { |
| 380 | dev_err(&pdev->dev, "Unable to get regmap\n"); |
| 381 | return -EINVAL; |
| 382 | } |
| 383 | |
| 384 | wled = devm_kzalloc(&pdev->dev, sizeof(*wled), GFP_KERNEL); |
| 385 | if (!wled) |
| 386 | return -ENOMEM; |
| 387 | |
| 388 | wled->regmap = regmap; |
| 389 | |
| 390 | rc = pm8941_wled_configure(wled, &pdev->dev); |
| 391 | if (rc) |
| 392 | return rc; |
| 393 | |
| 394 | rc = pm8941_wled_setup(wled); |
| 395 | if (rc) |
| 396 | return rc; |
| 397 | |
Bjorn Andersson | 7ddbc24 | 2015-07-21 17:44:49 -0700 | [diff] [blame] | 398 | memset(&props, 0, sizeof(struct backlight_properties)); |
| 399 | props.type = BACKLIGHT_RAW; |
| 400 | props.max_brightness = PM8941_WLED_REG_VAL_MAX; |
| 401 | bl = devm_backlight_device_register(&pdev->dev, wled->name, |
| 402 | &pdev->dev, wled, |
| 403 | &pm8941_wled_ops, &props); |
kbuild test robot | fc18111 | 2015-10-27 02:26:11 +0800 | [diff] [blame^] | 404 | return PTR_ERR_OR_ZERO(bl); |
Courtney Cavin | 93c64f1 | 2015-03-12 08:47:08 -0700 | [diff] [blame] | 405 | }; |
| 406 | |
| 407 | static const struct of_device_id pm8941_wled_match_table[] = { |
| 408 | { .compatible = "qcom,pm8941-wled" }, |
| 409 | {} |
| 410 | }; |
| 411 | MODULE_DEVICE_TABLE(of, pm8941_wled_match_table); |
| 412 | |
| 413 | static struct platform_driver pm8941_wled_driver = { |
| 414 | .probe = pm8941_wled_probe, |
| 415 | .driver = { |
| 416 | .name = "pm8941-wled", |
| 417 | .of_match_table = pm8941_wled_match_table, |
| 418 | }, |
| 419 | }; |
| 420 | |
| 421 | module_platform_driver(pm8941_wled_driver); |
| 422 | |
| 423 | MODULE_DESCRIPTION("pm8941 wled driver"); |
| 424 | MODULE_LICENSE("GPL v2"); |