Greg Kroah-Hartman | b244131 | 2017-11-01 15:07:57 +0100 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
Linus Walleij | e932d4f | 2017-04-04 14:08:18 +0200 | [diff] [blame] | 2 | #include <linux/bug.h> |
| 3 | #include <linux/kernel.h> |
| 4 | #include <linux/bitops.h> |
| 5 | #include <linux/math64.h> |
| 6 | #include <linux/log2.h> |
| 7 | #include <linux/err.h> |
Linus Walleij | 9a0ebbc | 2017-11-13 11:29:55 +0100 | [diff] [blame] | 8 | #include <linux/module.h> |
Linus Walleij | e932d4f | 2017-04-04 14:08:18 +0200 | [diff] [blame] | 9 | |
| 10 | #include "qcom-vadc-common.h" |
| 11 | |
| 12 | /* Voltage to temperature */ |
| 13 | static const struct vadc_map_pt adcmap_100k_104ef_104fb[] = { |
| 14 | {1758, -40}, |
| 15 | {1742, -35}, |
| 16 | {1719, -30}, |
| 17 | {1691, -25}, |
| 18 | {1654, -20}, |
| 19 | {1608, -15}, |
| 20 | {1551, -10}, |
| 21 | {1483, -5}, |
| 22 | {1404, 0}, |
| 23 | {1315, 5}, |
| 24 | {1218, 10}, |
| 25 | {1114, 15}, |
| 26 | {1007, 20}, |
| 27 | {900, 25}, |
| 28 | {795, 30}, |
| 29 | {696, 35}, |
| 30 | {605, 40}, |
| 31 | {522, 45}, |
| 32 | {448, 50}, |
| 33 | {383, 55}, |
| 34 | {327, 60}, |
| 35 | {278, 65}, |
| 36 | {237, 70}, |
| 37 | {202, 75}, |
| 38 | {172, 80}, |
| 39 | {146, 85}, |
| 40 | {125, 90}, |
| 41 | {107, 95}, |
| 42 | {92, 100}, |
| 43 | {79, 105}, |
| 44 | {68, 110}, |
| 45 | {59, 115}, |
| 46 | {51, 120}, |
| 47 | {44, 125} |
| 48 | }; |
| 49 | |
Siddartha Mohanadoss | e13d757 | 2018-08-02 18:43:53 -0700 | [diff] [blame] | 50 | /* |
| 51 | * Voltage to temperature table for 100k pull up for NTCG104EF104 with |
| 52 | * 1.875V reference. |
| 53 | */ |
| 54 | static const struct vadc_map_pt adcmap_100k_104ef_104fb_1875_vref[] = { |
| 55 | { 1831, -40000 }, |
| 56 | { 1814, -35000 }, |
| 57 | { 1791, -30000 }, |
| 58 | { 1761, -25000 }, |
| 59 | { 1723, -20000 }, |
| 60 | { 1675, -15000 }, |
| 61 | { 1616, -10000 }, |
| 62 | { 1545, -5000 }, |
| 63 | { 1463, 0 }, |
| 64 | { 1370, 5000 }, |
| 65 | { 1268, 10000 }, |
| 66 | { 1160, 15000 }, |
| 67 | { 1049, 20000 }, |
| 68 | { 937, 25000 }, |
| 69 | { 828, 30000 }, |
| 70 | { 726, 35000 }, |
| 71 | { 630, 40000 }, |
| 72 | { 544, 45000 }, |
| 73 | { 467, 50000 }, |
| 74 | { 399, 55000 }, |
| 75 | { 340, 60000 }, |
| 76 | { 290, 65000 }, |
| 77 | { 247, 70000 }, |
| 78 | { 209, 75000 }, |
| 79 | { 179, 80000 }, |
| 80 | { 153, 85000 }, |
| 81 | { 130, 90000 }, |
| 82 | { 112, 95000 }, |
| 83 | { 96, 100000 }, |
| 84 | { 82, 105000 }, |
| 85 | { 71, 110000 }, |
| 86 | { 62, 115000 }, |
| 87 | { 53, 120000 }, |
| 88 | { 46, 125000 }, |
| 89 | }; |
| 90 | |
| 91 | static int qcom_vadc_scale_hw_calib_volt( |
| 92 | const struct vadc_prescale_ratio *prescale, |
| 93 | const struct adc5_data *data, |
| 94 | u16 adc_code, int *result_uv); |
| 95 | static int qcom_vadc_scale_hw_calib_therm( |
| 96 | const struct vadc_prescale_ratio *prescale, |
| 97 | const struct adc5_data *data, |
| 98 | u16 adc_code, int *result_mdec); |
| 99 | static int qcom_vadc_scale_hw_smb_temp( |
| 100 | const struct vadc_prescale_ratio *prescale, |
| 101 | const struct adc5_data *data, |
| 102 | u16 adc_code, int *result_mdec); |
| 103 | static int qcom_vadc_scale_hw_chg5_temp( |
| 104 | const struct vadc_prescale_ratio *prescale, |
| 105 | const struct adc5_data *data, |
| 106 | u16 adc_code, int *result_mdec); |
| 107 | static int qcom_vadc_scale_hw_calib_die_temp( |
| 108 | const struct vadc_prescale_ratio *prescale, |
| 109 | const struct adc5_data *data, |
| 110 | u16 adc_code, int *result_mdec); |
| 111 | |
| 112 | static struct qcom_adc5_scale_type scale_adc5_fn[] = { |
| 113 | [SCALE_HW_CALIB_DEFAULT] = {qcom_vadc_scale_hw_calib_volt}, |
| 114 | [SCALE_HW_CALIB_THERM_100K_PULLUP] = {qcom_vadc_scale_hw_calib_therm}, |
| 115 | [SCALE_HW_CALIB_XOTHERM] = {qcom_vadc_scale_hw_calib_therm}, |
| 116 | [SCALE_HW_CALIB_PMIC_THERM] = {qcom_vadc_scale_hw_calib_die_temp}, |
| 117 | [SCALE_HW_CALIB_PM5_CHG_TEMP] = {qcom_vadc_scale_hw_chg5_temp}, |
| 118 | [SCALE_HW_CALIB_PM5_SMB_TEMP] = {qcom_vadc_scale_hw_smb_temp}, |
| 119 | }; |
| 120 | |
Linus Walleij | e932d4f | 2017-04-04 14:08:18 +0200 | [diff] [blame] | 121 | static int qcom_vadc_map_voltage_temp(const struct vadc_map_pt *pts, |
Siddartha Mohanadoss | e13d757 | 2018-08-02 18:43:53 -0700 | [diff] [blame] | 122 | u32 tablesize, s32 input, int *output) |
Linus Walleij | e932d4f | 2017-04-04 14:08:18 +0200 | [diff] [blame] | 123 | { |
| 124 | bool descending = 1; |
| 125 | u32 i = 0; |
| 126 | |
| 127 | if (!pts) |
| 128 | return -EINVAL; |
| 129 | |
| 130 | /* Check if table is descending or ascending */ |
| 131 | if (tablesize > 1) { |
| 132 | if (pts[0].x < pts[1].x) |
| 133 | descending = 0; |
| 134 | } |
| 135 | |
| 136 | while (i < tablesize) { |
| 137 | if ((descending) && (pts[i].x < input)) { |
| 138 | /* table entry is less than measured*/ |
| 139 | /* value and table is descending, stop */ |
| 140 | break; |
| 141 | } else if ((!descending) && |
| 142 | (pts[i].x > input)) { |
| 143 | /* table entry is greater than measured*/ |
| 144 | /*value and table is ascending, stop */ |
| 145 | break; |
| 146 | } |
| 147 | i++; |
| 148 | } |
| 149 | |
| 150 | if (i == 0) { |
| 151 | *output = pts[0].y; |
| 152 | } else if (i == tablesize) { |
| 153 | *output = pts[tablesize - 1].y; |
| 154 | } else { |
| 155 | /* result is between search_index and search_index-1 */ |
| 156 | /* interpolate linearly */ |
| 157 | *output = (((s32)((pts[i].y - pts[i - 1].y) * |
| 158 | (input - pts[i - 1].x)) / |
| 159 | (pts[i].x - pts[i - 1].x)) + |
| 160 | pts[i - 1].y); |
| 161 | } |
| 162 | |
| 163 | return 0; |
| 164 | } |
| 165 | |
| 166 | static void qcom_vadc_scale_calib(const struct vadc_linear_graph *calib_graph, |
| 167 | u16 adc_code, |
| 168 | bool absolute, |
| 169 | s64 *scale_voltage) |
| 170 | { |
| 171 | *scale_voltage = (adc_code - calib_graph->gnd); |
| 172 | *scale_voltage *= calib_graph->dx; |
| 173 | *scale_voltage = div64_s64(*scale_voltage, calib_graph->dy); |
| 174 | if (absolute) |
| 175 | *scale_voltage += calib_graph->dx; |
| 176 | |
| 177 | if (*scale_voltage < 0) |
| 178 | *scale_voltage = 0; |
| 179 | } |
| 180 | |
| 181 | static int qcom_vadc_scale_volt(const struct vadc_linear_graph *calib_graph, |
| 182 | const struct vadc_prescale_ratio *prescale, |
| 183 | bool absolute, u16 adc_code, |
| 184 | int *result_uv) |
| 185 | { |
| 186 | s64 voltage = 0, result = 0; |
| 187 | |
| 188 | qcom_vadc_scale_calib(calib_graph, adc_code, absolute, &voltage); |
| 189 | |
| 190 | voltage = voltage * prescale->den; |
| 191 | result = div64_s64(voltage, prescale->num); |
| 192 | *result_uv = result; |
| 193 | |
| 194 | return 0; |
| 195 | } |
| 196 | |
| 197 | static int qcom_vadc_scale_therm(const struct vadc_linear_graph *calib_graph, |
| 198 | const struct vadc_prescale_ratio *prescale, |
| 199 | bool absolute, u16 adc_code, |
| 200 | int *result_mdec) |
| 201 | { |
Siddartha Mohanadoss | e13d757 | 2018-08-02 18:43:53 -0700 | [diff] [blame] | 202 | s64 voltage = 0; |
Linus Walleij | e932d4f | 2017-04-04 14:08:18 +0200 | [diff] [blame] | 203 | int ret; |
| 204 | |
| 205 | qcom_vadc_scale_calib(calib_graph, adc_code, absolute, &voltage); |
| 206 | |
| 207 | if (absolute) |
| 208 | voltage = div64_s64(voltage, 1000); |
| 209 | |
| 210 | ret = qcom_vadc_map_voltage_temp(adcmap_100k_104ef_104fb, |
| 211 | ARRAY_SIZE(adcmap_100k_104ef_104fb), |
Siddartha Mohanadoss | e13d757 | 2018-08-02 18:43:53 -0700 | [diff] [blame] | 212 | voltage, result_mdec); |
Linus Walleij | e932d4f | 2017-04-04 14:08:18 +0200 | [diff] [blame] | 213 | if (ret) |
| 214 | return ret; |
| 215 | |
Siddartha Mohanadoss | e13d757 | 2018-08-02 18:43:53 -0700 | [diff] [blame] | 216 | *result_mdec *= 1000; |
Linus Walleij | e932d4f | 2017-04-04 14:08:18 +0200 | [diff] [blame] | 217 | |
| 218 | return 0; |
| 219 | } |
| 220 | |
| 221 | static int qcom_vadc_scale_die_temp(const struct vadc_linear_graph *calib_graph, |
| 222 | const struct vadc_prescale_ratio *prescale, |
| 223 | bool absolute, |
| 224 | u16 adc_code, int *result_mdec) |
| 225 | { |
| 226 | s64 voltage = 0; |
| 227 | u64 temp; /* Temporary variable for do_div */ |
| 228 | |
| 229 | qcom_vadc_scale_calib(calib_graph, adc_code, absolute, &voltage); |
| 230 | |
| 231 | if (voltage > 0) { |
| 232 | temp = voltage * prescale->den; |
| 233 | do_div(temp, prescale->num * 2); |
| 234 | voltage = temp; |
| 235 | } else { |
| 236 | voltage = 0; |
| 237 | } |
| 238 | |
| 239 | voltage -= KELVINMIL_CELSIUSMIL; |
| 240 | *result_mdec = voltage; |
| 241 | |
| 242 | return 0; |
| 243 | } |
| 244 | |
| 245 | static int qcom_vadc_scale_chg_temp(const struct vadc_linear_graph *calib_graph, |
| 246 | const struct vadc_prescale_ratio *prescale, |
| 247 | bool absolute, |
| 248 | u16 adc_code, int *result_mdec) |
| 249 | { |
| 250 | s64 voltage = 0, result = 0; |
| 251 | |
| 252 | qcom_vadc_scale_calib(calib_graph, adc_code, absolute, &voltage); |
| 253 | |
| 254 | voltage = voltage * prescale->den; |
| 255 | voltage = div64_s64(voltage, prescale->num); |
| 256 | voltage = ((PMI_CHG_SCALE_1) * (voltage * 2)); |
| 257 | voltage = (voltage + PMI_CHG_SCALE_2); |
| 258 | result = div64_s64(voltage, 1000000); |
| 259 | *result_mdec = result; |
| 260 | |
| 261 | return 0; |
| 262 | } |
| 263 | |
Siddartha Mohanadoss | e13d757 | 2018-08-02 18:43:53 -0700 | [diff] [blame] | 264 | static int qcom_vadc_scale_code_voltage_factor(u16 adc_code, |
| 265 | const struct vadc_prescale_ratio *prescale, |
| 266 | const struct adc5_data *data, |
| 267 | unsigned int factor) |
| 268 | { |
| 269 | s64 voltage, temp, adc_vdd_ref_mv = 1875; |
| 270 | |
| 271 | /* |
| 272 | * The normal data range is between 0V to 1.875V. On cases where |
| 273 | * we read low voltage values, the ADC code can go beyond the |
| 274 | * range and the scale result is incorrect so we clamp the values |
| 275 | * for the cases where the code represents a value below 0V |
| 276 | */ |
| 277 | if (adc_code > VADC5_MAX_CODE) |
| 278 | adc_code = 0; |
| 279 | |
| 280 | /* (ADC code * vref_vadc (1.875V)) / full_scale_code */ |
| 281 | voltage = (s64) adc_code * adc_vdd_ref_mv * 1000; |
| 282 | voltage = div64_s64(voltage, data->full_scale_code_volt); |
| 283 | if (voltage > 0) { |
| 284 | voltage *= prescale->den; |
| 285 | temp = prescale->num * factor; |
| 286 | voltage = div64_s64(voltage, temp); |
| 287 | } else { |
| 288 | voltage = 0; |
| 289 | } |
| 290 | |
| 291 | return (int) voltage; |
| 292 | } |
| 293 | |
| 294 | static int qcom_vadc_scale_hw_calib_volt( |
| 295 | const struct vadc_prescale_ratio *prescale, |
| 296 | const struct adc5_data *data, |
| 297 | u16 adc_code, int *result_uv) |
| 298 | { |
| 299 | *result_uv = qcom_vadc_scale_code_voltage_factor(adc_code, |
| 300 | prescale, data, 1); |
| 301 | |
| 302 | return 0; |
| 303 | } |
| 304 | |
| 305 | static int qcom_vadc_scale_hw_calib_therm( |
| 306 | const struct vadc_prescale_ratio *prescale, |
| 307 | const struct adc5_data *data, |
| 308 | u16 adc_code, int *result_mdec) |
| 309 | { |
| 310 | int voltage; |
| 311 | |
| 312 | voltage = qcom_vadc_scale_code_voltage_factor(adc_code, |
| 313 | prescale, data, 1000); |
| 314 | |
| 315 | /* Map voltage to temperature from look-up table */ |
| 316 | return qcom_vadc_map_voltage_temp(adcmap_100k_104ef_104fb_1875_vref, |
| 317 | ARRAY_SIZE(adcmap_100k_104ef_104fb_1875_vref), |
| 318 | voltage, result_mdec); |
| 319 | } |
| 320 | |
| 321 | static int qcom_vadc_scale_hw_calib_die_temp( |
| 322 | const struct vadc_prescale_ratio *prescale, |
| 323 | const struct adc5_data *data, |
| 324 | u16 adc_code, int *result_mdec) |
| 325 | { |
| 326 | *result_mdec = qcom_vadc_scale_code_voltage_factor(adc_code, |
| 327 | prescale, data, 2); |
| 328 | *result_mdec -= KELVINMIL_CELSIUSMIL; |
| 329 | |
| 330 | return 0; |
| 331 | } |
| 332 | |
| 333 | static int qcom_vadc_scale_hw_smb_temp( |
| 334 | const struct vadc_prescale_ratio *prescale, |
| 335 | const struct adc5_data *data, |
| 336 | u16 adc_code, int *result_mdec) |
| 337 | { |
| 338 | *result_mdec = qcom_vadc_scale_code_voltage_factor(adc_code * 100, |
| 339 | prescale, data, PMIC5_SMB_TEMP_SCALE_FACTOR); |
| 340 | *result_mdec = PMIC5_SMB_TEMP_CONSTANT - *result_mdec; |
| 341 | |
| 342 | return 0; |
| 343 | } |
| 344 | |
| 345 | static int qcom_vadc_scale_hw_chg5_temp( |
| 346 | const struct vadc_prescale_ratio *prescale, |
| 347 | const struct adc5_data *data, |
| 348 | u16 adc_code, int *result_mdec) |
| 349 | { |
| 350 | *result_mdec = qcom_vadc_scale_code_voltage_factor(adc_code, |
| 351 | prescale, data, 4); |
| 352 | *result_mdec = PMIC5_CHG_TEMP_SCALE_FACTOR - *result_mdec; |
| 353 | |
| 354 | return 0; |
| 355 | } |
| 356 | |
Linus Walleij | e932d4f | 2017-04-04 14:08:18 +0200 | [diff] [blame] | 357 | int qcom_vadc_scale(enum vadc_scale_fn_type scaletype, |
| 358 | const struct vadc_linear_graph *calib_graph, |
| 359 | const struct vadc_prescale_ratio *prescale, |
| 360 | bool absolute, |
| 361 | u16 adc_code, int *result) |
| 362 | { |
| 363 | switch (scaletype) { |
| 364 | case SCALE_DEFAULT: |
| 365 | return qcom_vadc_scale_volt(calib_graph, prescale, |
| 366 | absolute, adc_code, |
| 367 | result); |
| 368 | case SCALE_THERM_100K_PULLUP: |
| 369 | case SCALE_XOTHERM: |
| 370 | return qcom_vadc_scale_therm(calib_graph, prescale, |
| 371 | absolute, adc_code, |
| 372 | result); |
| 373 | case SCALE_PMIC_THERM: |
| 374 | return qcom_vadc_scale_die_temp(calib_graph, prescale, |
| 375 | absolute, adc_code, |
| 376 | result); |
| 377 | case SCALE_PMI_CHG_TEMP: |
| 378 | return qcom_vadc_scale_chg_temp(calib_graph, prescale, |
| 379 | absolute, adc_code, |
| 380 | result); |
| 381 | default: |
| 382 | return -EINVAL; |
| 383 | } |
| 384 | } |
| 385 | EXPORT_SYMBOL(qcom_vadc_scale); |
| 386 | |
Siddartha Mohanadoss | e13d757 | 2018-08-02 18:43:53 -0700 | [diff] [blame] | 387 | int qcom_adc5_hw_scale(enum vadc_scale_fn_type scaletype, |
| 388 | const struct vadc_prescale_ratio *prescale, |
| 389 | const struct adc5_data *data, |
| 390 | u16 adc_code, int *result) |
| 391 | { |
| 392 | if (!(scaletype >= SCALE_HW_CALIB_DEFAULT && |
| 393 | scaletype < SCALE_HW_CALIB_INVALID)) { |
| 394 | pr_err("Invalid scale type %d\n", scaletype); |
| 395 | return -EINVAL; |
| 396 | } |
| 397 | |
| 398 | return scale_adc5_fn[scaletype].scale_fn(prescale, data, |
| 399 | adc_code, result); |
| 400 | } |
| 401 | EXPORT_SYMBOL(qcom_adc5_hw_scale); |
| 402 | |
Linus Walleij | e932d4f | 2017-04-04 14:08:18 +0200 | [diff] [blame] | 403 | int qcom_vadc_decimation_from_dt(u32 value) |
| 404 | { |
| 405 | if (!is_power_of_2(value) || value < VADC_DECIMATION_MIN || |
| 406 | value > VADC_DECIMATION_MAX) |
| 407 | return -EINVAL; |
| 408 | |
| 409 | return __ffs64(value / VADC_DECIMATION_MIN); |
| 410 | } |
| 411 | EXPORT_SYMBOL(qcom_vadc_decimation_from_dt); |
Linus Walleij | 9a0ebbc | 2017-11-13 11:29:55 +0100 | [diff] [blame] | 412 | |
| 413 | MODULE_LICENSE("GPL v2"); |
| 414 | MODULE_DESCRIPTION("Qualcomm ADC common functionality"); |