1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Amlogic Meson Successive Approximation Register (SAR) A/D Converter 4 * 5 * Copyright (C) 2017 Martin Blumenstingl <martin.blumenstingl@googlemail.com> 6 */ 7 8 #include <linux/bitfield.h> 9 #include <linux/clk.h> 10 #include <linux/clk-provider.h> 11 #include <linux/delay.h> 12 #include <linux/io.h> 13 #include <linux/iio/iio.h> 14 #include <linux/module.h> 15 #include <linux/mutex.h> 16 #include <linux/nvmem-consumer.h> 17 #include <linux/interrupt.h> 18 #include <linux/of.h> 19 #include <linux/of_irq.h> 20 #include <linux/platform_device.h> 21 #include <linux/regmap.h> 22 #include <linux/regulator/consumer.h> 23 #include <linux/mfd/syscon.h> 24 25 #define MESON_SAR_ADC_REG0 0x00 26 #define MESON_SAR_ADC_REG0_PANEL_DETECT BIT(31) 27 #define MESON_SAR_ADC_REG0_BUSY_MASK GENMASK(30, 28) 28 #define MESON_SAR_ADC_REG0_DELTA_BUSY BIT(30) 29 #define MESON_SAR_ADC_REG0_AVG_BUSY BIT(29) 30 #define MESON_SAR_ADC_REG0_SAMPLE_BUSY BIT(28) 31 #define MESON_SAR_ADC_REG0_FIFO_FULL BIT(27) 32 #define MESON_SAR_ADC_REG0_FIFO_EMPTY BIT(26) 33 #define MESON_SAR_ADC_REG0_FIFO_COUNT_MASK GENMASK(25, 21) 34 #define MESON_SAR_ADC_REG0_ADC_BIAS_CTRL_MASK GENMASK(20, 19) 35 #define MESON_SAR_ADC_REG0_CURR_CHAN_ID_MASK GENMASK(18, 16) 36 #define MESON_SAR_ADC_REG0_ADC_TEMP_SEN_SEL BIT(15) 37 #define MESON_SAR_ADC_REG0_SAMPLING_STOP BIT(14) 38 #define MESON_SAR_ADC_REG0_CHAN_DELTA_EN_MASK GENMASK(13, 12) 39 #define MESON_SAR_ADC_REG0_DETECT_IRQ_POL BIT(10) 40 #define MESON_SAR_ADC_REG0_DETECT_IRQ_EN BIT(9) 41 #define MESON_SAR_ADC_REG0_FIFO_CNT_IRQ_MASK GENMASK(8, 4) 42 #define MESON_SAR_ADC_REG0_FIFO_IRQ_EN BIT(3) 43 #define MESON_SAR_ADC_REG0_SAMPLING_START BIT(2) 44 #define MESON_SAR_ADC_REG0_CONTINUOUS_EN BIT(1) 45 #define MESON_SAR_ADC_REG0_SAMPLE_ENGINE_ENABLE BIT(0) 46 47 #define MESON_SAR_ADC_CHAN_LIST 0x04 48 #define MESON_SAR_ADC_CHAN_LIST_MAX_INDEX_MASK GENMASK(26, 24) 49 #define MESON_SAR_ADC_CHAN_LIST_ENTRY_MASK(_chan) \ 50 (GENMASK(2, 0) << ((_chan) * 3)) 51 52 #define MESON_SAR_ADC_AVG_CNTL 0x08 53 #define MESON_SAR_ADC_AVG_CNTL_AVG_MODE_SHIFT(_chan) \ 54 (16 + ((_chan) * 2)) 55 #define MESON_SAR_ADC_AVG_CNTL_AVG_MODE_MASK(_chan) \ 56 (GENMASK(17, 16) << ((_chan) * 2)) 57 #define MESON_SAR_ADC_AVG_CNTL_NUM_SAMPLES_SHIFT(_chan) \ 58 (0 + ((_chan) * 2)) 59 #define MESON_SAR_ADC_AVG_CNTL_NUM_SAMPLES_MASK(_chan) \ 60 (GENMASK(1, 0) << ((_chan) * 2)) 61 62 #define MESON_SAR_ADC_REG3 0x0c 63 #define MESON_SAR_ADC_REG3_CNTL_USE_SC_DLY BIT(31) 64 #define MESON_SAR_ADC_REG3_CLK_EN BIT(30) 65 #define MESON_SAR_ADC_REG3_BL30_INITIALIZED BIT(28) 66 #define MESON_SAR_ADC_REG3_CTRL_CONT_RING_COUNTER_EN BIT(27) 67 #define MESON_SAR_ADC_REG3_CTRL_SAMPLING_CLOCK_PHASE BIT(26) 68 #define MESON_SAR_ADC_REG3_CTRL_CHAN7_MUX_SEL_MASK GENMASK(25, 23) 69 #define MESON_SAR_ADC_REG3_DETECT_EN BIT(22) 70 #define MESON_SAR_ADC_REG3_ADC_EN BIT(21) 71 #define MESON_SAR_ADC_REG3_PANEL_DETECT_COUNT_MASK GENMASK(20, 18) 72 #define MESON_SAR_ADC_REG3_PANEL_DETECT_FILTER_TB_MASK GENMASK(17, 16) 73 #define MESON_SAR_ADC_REG3_ADC_CLK_DIV_SHIFT 10 74 #define MESON_SAR_ADC_REG3_ADC_CLK_DIV_WIDTH 6 75 #define MESON_SAR_ADC_REG3_BLOCK_DLY_SEL_MASK GENMASK(9, 8) 76 #define MESON_SAR_ADC_REG3_BLOCK_DLY_MASK GENMASK(7, 0) 77 78 #define MESON_SAR_ADC_DELAY 0x10 79 #define MESON_SAR_ADC_DELAY_INPUT_DLY_SEL_MASK GENMASK(25, 24) 80 #define MESON_SAR_ADC_DELAY_BL30_BUSY BIT(15) 81 #define MESON_SAR_ADC_DELAY_KERNEL_BUSY BIT(14) 82 #define MESON_SAR_ADC_DELAY_INPUT_DLY_CNT_MASK GENMASK(23, 16) 83 #define MESON_SAR_ADC_DELAY_SAMPLE_DLY_SEL_MASK GENMASK(9, 8) 84 #define MESON_SAR_ADC_DELAY_SAMPLE_DLY_CNT_MASK GENMASK(7, 0) 85 86 #define MESON_SAR_ADC_LAST_RD 0x14 87 #define MESON_SAR_ADC_LAST_RD_LAST_CHANNEL1_MASK GENMASK(23, 16) 88 #define MESON_SAR_ADC_LAST_RD_LAST_CHANNEL0_MASK GENMASK(9, 0) 89 90 #define MESON_SAR_ADC_FIFO_RD 0x18 91 #define MESON_SAR_ADC_FIFO_RD_CHAN_ID_MASK GENMASK(14, 12) 92 #define MESON_SAR_ADC_FIFO_RD_SAMPLE_VALUE_MASK GENMASK(11, 0) 93 94 #define MESON_SAR_ADC_AUX_SW 0x1c 95 #define MESON_SAR_ADC_AUX_SW_MUX_SEL_CHAN_SHIFT(_chan) \ 96 (8 + (((_chan) - 2) * 3)) 97 #define MESON_SAR_ADC_AUX_SW_VREF_P_MUX BIT(6) 98 #define MESON_SAR_ADC_AUX_SW_VREF_N_MUX BIT(5) 99 #define MESON_SAR_ADC_AUX_SW_MODE_SEL BIT(4) 100 #define MESON_SAR_ADC_AUX_SW_YP_DRIVE_SW BIT(3) 101 #define MESON_SAR_ADC_AUX_SW_XP_DRIVE_SW BIT(2) 102 #define MESON_SAR_ADC_AUX_SW_YM_DRIVE_SW BIT(1) 103 #define MESON_SAR_ADC_AUX_SW_XM_DRIVE_SW BIT(0) 104 105 #define MESON_SAR_ADC_CHAN_10_SW 0x20 106 #define MESON_SAR_ADC_CHAN_10_SW_CHAN1_MUX_SEL_MASK GENMASK(25, 23) 107 #define MESON_SAR_ADC_CHAN_10_SW_CHAN1_VREF_P_MUX BIT(22) 108 #define MESON_SAR_ADC_CHAN_10_SW_CHAN1_VREF_N_MUX BIT(21) 109 #define MESON_SAR_ADC_CHAN_10_SW_CHAN1_MODE_SEL BIT(20) 110 #define MESON_SAR_ADC_CHAN_10_SW_CHAN1_YP_DRIVE_SW BIT(19) 111 #define MESON_SAR_ADC_CHAN_10_SW_CHAN1_XP_DRIVE_SW BIT(18) 112 #define MESON_SAR_ADC_CHAN_10_SW_CHAN1_YM_DRIVE_SW BIT(17) 113 #define MESON_SAR_ADC_CHAN_10_SW_CHAN1_XM_DRIVE_SW BIT(16) 114 #define MESON_SAR_ADC_CHAN_10_SW_CHAN0_MUX_SEL_MASK GENMASK(9, 7) 115 #define MESON_SAR_ADC_CHAN_10_SW_CHAN0_VREF_P_MUX BIT(6) 116 #define MESON_SAR_ADC_CHAN_10_SW_CHAN0_VREF_N_MUX BIT(5) 117 #define MESON_SAR_ADC_CHAN_10_SW_CHAN0_MODE_SEL BIT(4) 118 #define MESON_SAR_ADC_CHAN_10_SW_CHAN0_YP_DRIVE_SW BIT(3) 119 #define MESON_SAR_ADC_CHAN_10_SW_CHAN0_XP_DRIVE_SW BIT(2) 120 #define MESON_SAR_ADC_CHAN_10_SW_CHAN0_YM_DRIVE_SW BIT(1) 121 #define MESON_SAR_ADC_CHAN_10_SW_CHAN0_XM_DRIVE_SW BIT(0) 122 123 #define MESON_SAR_ADC_DETECT_IDLE_SW 0x24 124 #define MESON_SAR_ADC_DETECT_IDLE_SW_DETECT_SW_EN BIT(26) 125 #define MESON_SAR_ADC_DETECT_IDLE_SW_DETECT_MUX_MASK GENMASK(25, 23) 126 #define MESON_SAR_ADC_DETECT_IDLE_SW_DETECT_VREF_P_MUX BIT(22) 127 #define MESON_SAR_ADC_DETECT_IDLE_SW_DETECT_VREF_N_MUX BIT(21) 128 #define MESON_SAR_ADC_DETECT_IDLE_SW_DETECT_MODE_SEL BIT(20) 129 #define MESON_SAR_ADC_DETECT_IDLE_SW_DETECT_YP_DRIVE_SW BIT(19) 130 #define MESON_SAR_ADC_DETECT_IDLE_SW_DETECT_XP_DRIVE_SW BIT(18) 131 #define MESON_SAR_ADC_DETECT_IDLE_SW_DETECT_YM_DRIVE_SW BIT(17) 132 #define MESON_SAR_ADC_DETECT_IDLE_SW_DETECT_XM_DRIVE_SW BIT(16) 133 #define MESON_SAR_ADC_DETECT_IDLE_SW_IDLE_MUX_SEL_MASK GENMASK(9, 7) 134 #define MESON_SAR_ADC_DETECT_IDLE_SW_IDLE_VREF_P_MUX BIT(6) 135 #define MESON_SAR_ADC_DETECT_IDLE_SW_IDLE_VREF_N_MUX BIT(5) 136 #define MESON_SAR_ADC_DETECT_IDLE_SW_IDLE_MODE_SEL BIT(4) 137 #define MESON_SAR_ADC_DETECT_IDLE_SW_IDLE_YP_DRIVE_SW BIT(3) 138 #define MESON_SAR_ADC_DETECT_IDLE_SW_IDLE_XP_DRIVE_SW BIT(2) 139 #define MESON_SAR_ADC_DETECT_IDLE_SW_IDLE_YM_DRIVE_SW BIT(1) 140 #define MESON_SAR_ADC_DETECT_IDLE_SW_IDLE_XM_DRIVE_SW BIT(0) 141 142 #define MESON_SAR_ADC_DELTA_10 0x28 143 #define MESON_SAR_ADC_DELTA_10_TEMP_SEL BIT(27) 144 #define MESON_SAR_ADC_DELTA_10_TS_REVE1 BIT(26) 145 #define MESON_SAR_ADC_DELTA_10_CHAN1_DELTA_VALUE_MASK GENMASK(25, 16) 146 #define MESON_SAR_ADC_DELTA_10_TS_REVE0 BIT(15) 147 #define MESON_SAR_ADC_DELTA_10_TS_C_MASK GENMASK(14, 11) 148 #define MESON_SAR_ADC_DELTA_10_TS_VBG_EN BIT(10) 149 #define MESON_SAR_ADC_DELTA_10_CHAN0_DELTA_VALUE_MASK GENMASK(9, 0) 150 151 /* 152 * NOTE: registers from here are undocumented (the vendor Linux kernel driver 153 * and u-boot source served as reference). These only seem to be relevant on 154 * GXBB and newer. 155 */ 156 #define MESON_SAR_ADC_REG11 0x2c 157 #define MESON_SAR_ADC_REG11_BANDGAP_EN BIT(13) 158 #define MESON_SAR_ADC_REG11_CMV_SEL BIT(6) 159 #define MESON_SAR_ADC_REG11_VREF_VOLTAGE BIT(5) 160 #define MESON_SAR_ADC_REG11_EOC BIT(1) 161 #define MESON_SAR_ADC_REG11_VREF_SEL BIT(0) 162 163 #define MESON_SAR_ADC_REG13 0x34 164 #define MESON_SAR_ADC_REG13_12BIT_CALIBRATION_MASK GENMASK(13, 8) 165 166 #define MESON_SAR_ADC_MAX_FIFO_SIZE 32 167 #define MESON_SAR_ADC_TIMEOUT 100 /* ms */ 168 #define MESON_SAR_ADC_VOLTAGE_AND_TEMP_CHANNEL 6 169 #define MESON_SAR_ADC_VOLTAGE_AND_MUX_CHANNEL 7 170 #define MESON_SAR_ADC_TEMP_OFFSET 27 171 172 /* temperature sensor calibration information in eFuse */ 173 #define MESON_SAR_ADC_EFUSE_BYTES 4 174 #define MESON_SAR_ADC_EFUSE_BYTE3_UPPER_ADC_VAL GENMASK(6, 0) 175 #define MESON_SAR_ADC_EFUSE_BYTE3_IS_CALIBRATED BIT(7) 176 177 #define MESON_HHI_DPLL_TOP_0 0x318 178 #define MESON_HHI_DPLL_TOP_0_TSC_BIT4 BIT(9) 179 180 /* for use with IIO_VAL_INT_PLUS_MICRO */ 181 #define MILLION 1000000 182 183 #define MESON_SAR_ADC_CHAN(_chan) { \ 184 .type = IIO_VOLTAGE, \ 185 .indexed = 1, \ 186 .channel = _chan, \ 187 .address = _chan, \ 188 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ 189 BIT(IIO_CHAN_INFO_AVERAGE_RAW), \ 190 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ 191 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_CALIBBIAS) | \ 192 BIT(IIO_CHAN_INFO_CALIBSCALE), \ 193 .datasheet_name = "SAR_ADC_CH"#_chan, \ 194 } 195 196 #define MESON_SAR_ADC_TEMP_CHAN(_chan) { \ 197 .type = IIO_TEMP, \ 198 .channel = _chan, \ 199 .address = MESON_SAR_ADC_VOLTAGE_AND_TEMP_CHANNEL, \ 200 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ 201 BIT(IIO_CHAN_INFO_AVERAGE_RAW), \ 202 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) | \ 203 BIT(IIO_CHAN_INFO_SCALE), \ 204 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_CALIBBIAS) | \ 205 BIT(IIO_CHAN_INFO_CALIBSCALE), \ 206 .datasheet_name = "TEMP_SENSOR", \ 207 } 208 209 #define MESON_SAR_ADC_MUX(_chan, _sel) { \ 210 .type = IIO_VOLTAGE, \ 211 .channel = _chan, \ 212 .indexed = 1, \ 213 .address = MESON_SAR_ADC_VOLTAGE_AND_MUX_CHANNEL, \ 214 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ 215 BIT(IIO_CHAN_INFO_AVERAGE_RAW), \ 216 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ 217 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_CALIBBIAS) | \ 218 BIT(IIO_CHAN_INFO_CALIBSCALE), \ 219 .datasheet_name = "SAR_ADC_MUX_"#_sel, \ 220 } 221 222 enum meson_sar_adc_vref_sel { 223 VREF_CALIBATION_VOLTAGE = 0, 224 VREF_VDDA = 1, 225 }; 226 227 enum meson_sar_adc_avg_mode { 228 NO_AVERAGING = 0x0, 229 MEAN_AVERAGING = 0x1, 230 MEDIAN_AVERAGING = 0x2, 231 }; 232 233 enum meson_sar_adc_num_samples { 234 ONE_SAMPLE = 0x0, 235 TWO_SAMPLES = 0x1, 236 FOUR_SAMPLES = 0x2, 237 EIGHT_SAMPLES = 0x3, 238 }; 239 240 enum meson_sar_adc_chan7_mux_sel { 241 CHAN7_MUX_VSS = 0x0, 242 CHAN7_MUX_VDD_DIV4 = 0x1, 243 CHAN7_MUX_VDD_DIV2 = 0x2, 244 CHAN7_MUX_VDD_MUL3_DIV4 = 0x3, 245 CHAN7_MUX_VDD = 0x4, 246 CHAN7_MUX_CH7_INPUT = 0x7, 247 }; 248 249 enum meson_sar_adc_channel_index { 250 NUM_CHAN_0, 251 NUM_CHAN_1, 252 NUM_CHAN_2, 253 NUM_CHAN_3, 254 NUM_CHAN_4, 255 NUM_CHAN_5, 256 NUM_CHAN_6, 257 NUM_CHAN_7, 258 NUM_CHAN_TEMP, 259 NUM_MUX_0_VSS, 260 NUM_MUX_1_VDD_DIV4, 261 NUM_MUX_2_VDD_DIV2, 262 NUM_MUX_3_VDD_MUL3_DIV4, 263 NUM_MUX_4_VDD, 264 }; 265 266 static enum meson_sar_adc_chan7_mux_sel chan7_mux_values[] = { 267 CHAN7_MUX_VSS, 268 CHAN7_MUX_VDD_DIV4, 269 CHAN7_MUX_VDD_DIV2, 270 CHAN7_MUX_VDD_MUL3_DIV4, 271 CHAN7_MUX_VDD, 272 }; 273 274 static const char * const chan7_mux_names[] = { 275 [CHAN7_MUX_VSS] = "gnd", 276 [CHAN7_MUX_VDD_DIV4] = "0.25vdd", 277 [CHAN7_MUX_VDD_DIV2] = "0.5vdd", 278 [CHAN7_MUX_VDD_MUL3_DIV4] = "0.75vdd", 279 [CHAN7_MUX_VDD] = "vdd", 280 }; 281 282 static const struct iio_chan_spec meson_sar_adc_iio_channels[] = { 283 MESON_SAR_ADC_CHAN(NUM_CHAN_0), 284 MESON_SAR_ADC_CHAN(NUM_CHAN_1), 285 MESON_SAR_ADC_CHAN(NUM_CHAN_2), 286 MESON_SAR_ADC_CHAN(NUM_CHAN_3), 287 MESON_SAR_ADC_CHAN(NUM_CHAN_4), 288 MESON_SAR_ADC_CHAN(NUM_CHAN_5), 289 MESON_SAR_ADC_CHAN(NUM_CHAN_6), 290 MESON_SAR_ADC_CHAN(NUM_CHAN_7), 291 MESON_SAR_ADC_MUX(NUM_MUX_0_VSS, 0), 292 MESON_SAR_ADC_MUX(NUM_MUX_1_VDD_DIV4, 1), 293 MESON_SAR_ADC_MUX(NUM_MUX_2_VDD_DIV2, 2), 294 MESON_SAR_ADC_MUX(NUM_MUX_3_VDD_MUL3_DIV4, 3), 295 MESON_SAR_ADC_MUX(NUM_MUX_4_VDD, 4), 296 }; 297 298 static const struct iio_chan_spec meson_sar_adc_and_temp_iio_channels[] = { 299 MESON_SAR_ADC_CHAN(NUM_CHAN_0), 300 MESON_SAR_ADC_CHAN(NUM_CHAN_1), 301 MESON_SAR_ADC_CHAN(NUM_CHAN_2), 302 MESON_SAR_ADC_CHAN(NUM_CHAN_3), 303 MESON_SAR_ADC_CHAN(NUM_CHAN_4), 304 MESON_SAR_ADC_CHAN(NUM_CHAN_5), 305 MESON_SAR_ADC_CHAN(NUM_CHAN_6), 306 MESON_SAR_ADC_CHAN(NUM_CHAN_7), 307 MESON_SAR_ADC_TEMP_CHAN(NUM_CHAN_TEMP), 308 MESON_SAR_ADC_MUX(NUM_MUX_0_VSS, 0), 309 MESON_SAR_ADC_MUX(NUM_MUX_1_VDD_DIV4, 1), 310 MESON_SAR_ADC_MUX(NUM_MUX_2_VDD_DIV2, 2), 311 MESON_SAR_ADC_MUX(NUM_MUX_3_VDD_MUL3_DIV4, 3), 312 MESON_SAR_ADC_MUX(NUM_MUX_4_VDD, 4), 313 }; 314 315 struct meson_sar_adc_param { 316 bool has_bl30_integration; 317 unsigned long clock_rate; 318 u32 bandgap_reg; 319 unsigned int resolution; 320 const struct regmap_config *regmap_config; 321 u8 temperature_trimming_bits; 322 unsigned int temperature_multiplier; 323 unsigned int temperature_divider; 324 u8 disable_ring_counter; 325 bool has_reg11; 326 bool has_vref_select; 327 u8 vref_select; 328 u8 cmv_select; 329 u8 adc_eoc; 330 enum meson_sar_adc_vref_sel vref_volatge; 331 }; 332 333 struct meson_sar_adc_data { 334 const struct meson_sar_adc_param *param; 335 const char *name; 336 }; 337 338 struct meson_sar_adc_priv { 339 struct regmap *regmap; 340 struct regulator *vref; 341 const struct meson_sar_adc_param *param; 342 struct clk *clkin; 343 struct clk *core_clk; 344 struct clk *adc_sel_clk; 345 struct clk *adc_clk; 346 struct clk_gate clk_gate; 347 struct clk *adc_div_clk; 348 struct clk_divider clk_div; 349 struct completion done; 350 /* lock to protect against multiple access to the device */ 351 struct mutex lock; 352 int calibbias; 353 int calibscale; 354 struct regmap *tsc_regmap; 355 bool temperature_sensor_calibrated; 356 u8 temperature_sensor_coefficient; 357 u16 temperature_sensor_adc_val; 358 enum meson_sar_adc_chan7_mux_sel chan7_mux_sel; 359 }; 360 361 static const struct regmap_config meson_sar_adc_regmap_config_gxbb = { 362 .reg_bits = 8, 363 .val_bits = 32, 364 .reg_stride = 4, 365 .max_register = MESON_SAR_ADC_REG13, 366 }; 367 368 static const struct regmap_config meson_sar_adc_regmap_config_meson8 = { 369 .reg_bits = 8, 370 .val_bits = 32, 371 .reg_stride = 4, 372 .max_register = MESON_SAR_ADC_DELTA_10, 373 }; 374 375 static const struct iio_chan_spec * 376 find_channel_by_num(struct iio_dev *indio_dev, int num) 377 { 378 int i; 379 380 for (i = 0; i < indio_dev->num_channels; i++) 381 if (indio_dev->channels[i].channel == num) 382 return &indio_dev->channels[i]; 383 return NULL; 384 } 385 386 static unsigned int meson_sar_adc_get_fifo_count(struct iio_dev *indio_dev) 387 { 388 struct meson_sar_adc_priv *priv = iio_priv(indio_dev); 389 u32 regval; 390 391 regmap_read(priv->regmap, MESON_SAR_ADC_REG0, ®val); 392 393 return FIELD_GET(MESON_SAR_ADC_REG0_FIFO_COUNT_MASK, regval); 394 } 395 396 static int meson_sar_adc_calib_val(struct iio_dev *indio_dev, int val) 397 { 398 struct meson_sar_adc_priv *priv = iio_priv(indio_dev); 399 int tmp; 400 401 /* use val_calib = scale * val_raw + offset calibration function */ 402 tmp = div_s64((s64)val * priv->calibscale, MILLION) + priv->calibbias; 403 404 return clamp(tmp, 0, (1 << priv->param->resolution) - 1); 405 } 406 407 static int meson_sar_adc_wait_busy_clear(struct iio_dev *indio_dev) 408 { 409 struct meson_sar_adc_priv *priv = iio_priv(indio_dev); 410 int val; 411 412 /* 413 * NOTE: we need a small delay before reading the status, otherwise 414 * the sample engine may not have started internally (which would 415 * seem to us that sampling is already finished). 416 */ 417 udelay(1); 418 return regmap_read_poll_timeout_atomic(priv->regmap, MESON_SAR_ADC_REG0, val, 419 !FIELD_GET(MESON_SAR_ADC_REG0_BUSY_MASK, val), 420 1, 10000); 421 } 422 423 static void meson_sar_adc_set_chan7_mux(struct iio_dev *indio_dev, 424 enum meson_sar_adc_chan7_mux_sel sel) 425 { 426 struct meson_sar_adc_priv *priv = iio_priv(indio_dev); 427 u32 regval; 428 429 regval = FIELD_PREP(MESON_SAR_ADC_REG3_CTRL_CHAN7_MUX_SEL_MASK, sel); 430 regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG3, 431 MESON_SAR_ADC_REG3_CTRL_CHAN7_MUX_SEL_MASK, regval); 432 433 usleep_range(10, 20); 434 435 priv->chan7_mux_sel = sel; 436 } 437 438 static int meson_sar_adc_read_raw_sample(struct iio_dev *indio_dev, 439 const struct iio_chan_spec *chan, 440 int *val) 441 { 442 struct meson_sar_adc_priv *priv = iio_priv(indio_dev); 443 struct device *dev = indio_dev->dev.parent; 444 int regval, fifo_chan, fifo_val, count; 445 446 if (!wait_for_completion_timeout(&priv->done, 447 msecs_to_jiffies(MESON_SAR_ADC_TIMEOUT))) 448 return -ETIMEDOUT; 449 450 count = meson_sar_adc_get_fifo_count(indio_dev); 451 if (count != 1) { 452 dev_err(dev, "ADC FIFO has %d element(s) instead of one\n", count); 453 return -EINVAL; 454 } 455 456 regmap_read(priv->regmap, MESON_SAR_ADC_FIFO_RD, ®val); 457 fifo_chan = FIELD_GET(MESON_SAR_ADC_FIFO_RD_CHAN_ID_MASK, regval); 458 if (fifo_chan != chan->address) { 459 dev_err(dev, "ADC FIFO entry belongs to channel %d instead of %lu\n", 460 fifo_chan, chan->address); 461 return -EINVAL; 462 } 463 464 fifo_val = FIELD_GET(MESON_SAR_ADC_FIFO_RD_SAMPLE_VALUE_MASK, regval); 465 fifo_val &= GENMASK(priv->param->resolution - 1, 0); 466 *val = meson_sar_adc_calib_val(indio_dev, fifo_val); 467 468 return 0; 469 } 470 471 static void meson_sar_adc_set_averaging(struct iio_dev *indio_dev, 472 const struct iio_chan_spec *chan, 473 enum meson_sar_adc_avg_mode mode, 474 enum meson_sar_adc_num_samples samples) 475 { 476 struct meson_sar_adc_priv *priv = iio_priv(indio_dev); 477 int val, address = chan->address; 478 479 val = samples << MESON_SAR_ADC_AVG_CNTL_NUM_SAMPLES_SHIFT(address); 480 regmap_update_bits(priv->regmap, MESON_SAR_ADC_AVG_CNTL, 481 MESON_SAR_ADC_AVG_CNTL_NUM_SAMPLES_MASK(address), 482 val); 483 484 val = mode << MESON_SAR_ADC_AVG_CNTL_AVG_MODE_SHIFT(address); 485 regmap_update_bits(priv->regmap, MESON_SAR_ADC_AVG_CNTL, 486 MESON_SAR_ADC_AVG_CNTL_AVG_MODE_MASK(address), val); 487 } 488 489 static void meson_sar_adc_enable_channel(struct iio_dev *indio_dev, 490 const struct iio_chan_spec *chan) 491 { 492 struct meson_sar_adc_priv *priv = iio_priv(indio_dev); 493 u32 regval; 494 495 /* 496 * the SAR ADC engine allows sampling multiple channels at the same 497 * time. to keep it simple we're only working with one *internal* 498 * channel, which starts counting at index 0 (which means: count = 1). 499 */ 500 regval = FIELD_PREP(MESON_SAR_ADC_CHAN_LIST_MAX_INDEX_MASK, 0); 501 regmap_update_bits(priv->regmap, MESON_SAR_ADC_CHAN_LIST, 502 MESON_SAR_ADC_CHAN_LIST_MAX_INDEX_MASK, regval); 503 504 /* map channel index 0 to the channel which we want to read */ 505 regval = FIELD_PREP(MESON_SAR_ADC_CHAN_LIST_ENTRY_MASK(0), 506 chan->address); 507 regmap_update_bits(priv->regmap, MESON_SAR_ADC_CHAN_LIST, 508 MESON_SAR_ADC_CHAN_LIST_ENTRY_MASK(0), regval); 509 510 regval = FIELD_PREP(MESON_SAR_ADC_DETECT_IDLE_SW_DETECT_MUX_MASK, 511 chan->address); 512 regmap_update_bits(priv->regmap, MESON_SAR_ADC_DETECT_IDLE_SW, 513 MESON_SAR_ADC_DETECT_IDLE_SW_DETECT_MUX_MASK, 514 regval); 515 516 regval = FIELD_PREP(MESON_SAR_ADC_DETECT_IDLE_SW_IDLE_MUX_SEL_MASK, 517 chan->address); 518 regmap_update_bits(priv->regmap, MESON_SAR_ADC_DETECT_IDLE_SW, 519 MESON_SAR_ADC_DETECT_IDLE_SW_IDLE_MUX_SEL_MASK, 520 regval); 521 522 if (chan->address == MESON_SAR_ADC_VOLTAGE_AND_TEMP_CHANNEL) { 523 if (chan->type == IIO_TEMP) 524 regval = MESON_SAR_ADC_DELTA_10_TEMP_SEL; 525 else 526 regval = 0; 527 528 regmap_update_bits(priv->regmap, 529 MESON_SAR_ADC_DELTA_10, 530 MESON_SAR_ADC_DELTA_10_TEMP_SEL, regval); 531 } else if (chan->address == MESON_SAR_ADC_VOLTAGE_AND_MUX_CHANNEL) { 532 enum meson_sar_adc_chan7_mux_sel sel; 533 534 if (chan->channel == NUM_CHAN_7) 535 sel = CHAN7_MUX_CH7_INPUT; 536 else 537 sel = chan7_mux_values[chan->channel - NUM_MUX_0_VSS]; 538 if (sel != priv->chan7_mux_sel) 539 meson_sar_adc_set_chan7_mux(indio_dev, sel); 540 } 541 } 542 543 static void meson_sar_adc_start_sample_engine(struct iio_dev *indio_dev) 544 { 545 struct meson_sar_adc_priv *priv = iio_priv(indio_dev); 546 547 reinit_completion(&priv->done); 548 549 regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG0, 550 MESON_SAR_ADC_REG0_FIFO_IRQ_EN, 551 MESON_SAR_ADC_REG0_FIFO_IRQ_EN); 552 553 regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG0, 554 MESON_SAR_ADC_REG0_SAMPLE_ENGINE_ENABLE, 555 MESON_SAR_ADC_REG0_SAMPLE_ENGINE_ENABLE); 556 557 regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG0, 558 MESON_SAR_ADC_REG0_SAMPLING_START, 559 MESON_SAR_ADC_REG0_SAMPLING_START); 560 } 561 562 static void meson_sar_adc_stop_sample_engine(struct iio_dev *indio_dev) 563 { 564 struct meson_sar_adc_priv *priv = iio_priv(indio_dev); 565 566 regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG0, 567 MESON_SAR_ADC_REG0_FIFO_IRQ_EN, 0); 568 569 regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG0, 570 MESON_SAR_ADC_REG0_SAMPLING_STOP, 571 MESON_SAR_ADC_REG0_SAMPLING_STOP); 572 573 /* wait until all modules are stopped */ 574 meson_sar_adc_wait_busy_clear(indio_dev); 575 576 regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG0, 577 MESON_SAR_ADC_REG0_SAMPLE_ENGINE_ENABLE, 0); 578 } 579 580 static int meson_sar_adc_lock(struct iio_dev *indio_dev) 581 { 582 struct meson_sar_adc_priv *priv = iio_priv(indio_dev); 583 int val, ret; 584 585 mutex_lock(&priv->lock); 586 587 if (priv->param->has_bl30_integration) { 588 /* prevent BL30 from using the SAR ADC while we are using it */ 589 regmap_update_bits(priv->regmap, MESON_SAR_ADC_DELAY, 590 MESON_SAR_ADC_DELAY_KERNEL_BUSY, 591 MESON_SAR_ADC_DELAY_KERNEL_BUSY); 592 593 udelay(1); 594 595 /* 596 * wait until BL30 releases it's lock (so we can use the SAR 597 * ADC) 598 */ 599 ret = regmap_read_poll_timeout_atomic(priv->regmap, MESON_SAR_ADC_DELAY, val, 600 !(val & MESON_SAR_ADC_DELAY_BL30_BUSY), 601 1, 10000); 602 if (ret) { 603 mutex_unlock(&priv->lock); 604 return ret; 605 } 606 } 607 608 return 0; 609 } 610 611 static void meson_sar_adc_unlock(struct iio_dev *indio_dev) 612 { 613 struct meson_sar_adc_priv *priv = iio_priv(indio_dev); 614 615 if (priv->param->has_bl30_integration) 616 /* allow BL30 to use the SAR ADC again */ 617 regmap_update_bits(priv->regmap, MESON_SAR_ADC_DELAY, 618 MESON_SAR_ADC_DELAY_KERNEL_BUSY, 0); 619 620 mutex_unlock(&priv->lock); 621 } 622 623 static void meson_sar_adc_clear_fifo(struct iio_dev *indio_dev) 624 { 625 struct meson_sar_adc_priv *priv = iio_priv(indio_dev); 626 unsigned int count, tmp; 627 628 for (count = 0; count < MESON_SAR_ADC_MAX_FIFO_SIZE; count++) { 629 if (!meson_sar_adc_get_fifo_count(indio_dev)) 630 break; 631 632 regmap_read(priv->regmap, MESON_SAR_ADC_FIFO_RD, &tmp); 633 } 634 } 635 636 static int meson_sar_adc_get_sample(struct iio_dev *indio_dev, 637 const struct iio_chan_spec *chan, 638 enum meson_sar_adc_avg_mode avg_mode, 639 enum meson_sar_adc_num_samples avg_samples, 640 int *val) 641 { 642 struct meson_sar_adc_priv *priv = iio_priv(indio_dev); 643 struct device *dev = indio_dev->dev.parent; 644 int ret; 645 646 if (chan->type == IIO_TEMP && !priv->temperature_sensor_calibrated) 647 return -ENOTSUPP; 648 649 ret = meson_sar_adc_lock(indio_dev); 650 if (ret) 651 return ret; 652 653 /* clear the FIFO to make sure we're not reading old values */ 654 meson_sar_adc_clear_fifo(indio_dev); 655 656 meson_sar_adc_set_averaging(indio_dev, chan, avg_mode, avg_samples); 657 658 meson_sar_adc_enable_channel(indio_dev, chan); 659 660 meson_sar_adc_start_sample_engine(indio_dev); 661 ret = meson_sar_adc_read_raw_sample(indio_dev, chan, val); 662 meson_sar_adc_stop_sample_engine(indio_dev); 663 664 meson_sar_adc_unlock(indio_dev); 665 666 if (ret) { 667 dev_warn(dev, "failed to read sample for channel %lu: %d\n", 668 chan->address, ret); 669 return ret; 670 } 671 672 return IIO_VAL_INT; 673 } 674 675 static int meson_sar_adc_iio_info_read_raw(struct iio_dev *indio_dev, 676 const struct iio_chan_spec *chan, 677 int *val, int *val2, long mask) 678 { 679 struct meson_sar_adc_priv *priv = iio_priv(indio_dev); 680 struct device *dev = indio_dev->dev.parent; 681 int ret; 682 683 switch (mask) { 684 case IIO_CHAN_INFO_RAW: 685 return meson_sar_adc_get_sample(indio_dev, chan, NO_AVERAGING, 686 ONE_SAMPLE, val); 687 688 case IIO_CHAN_INFO_AVERAGE_RAW: 689 return meson_sar_adc_get_sample(indio_dev, chan, 690 MEAN_AVERAGING, EIGHT_SAMPLES, 691 val); 692 693 case IIO_CHAN_INFO_SCALE: 694 if (chan->type == IIO_VOLTAGE) { 695 ret = regulator_get_voltage(priv->vref); 696 if (ret < 0) { 697 dev_err(dev, "failed to get vref voltage: %d\n", ret); 698 return ret; 699 } 700 701 *val = ret / 1000; 702 *val2 = priv->param->resolution; 703 return IIO_VAL_FRACTIONAL_LOG2; 704 } else if (chan->type == IIO_TEMP) { 705 /* SoC specific multiplier and divider */ 706 *val = priv->param->temperature_multiplier; 707 *val2 = priv->param->temperature_divider; 708 709 /* celsius to millicelsius */ 710 *val *= 1000; 711 712 return IIO_VAL_FRACTIONAL; 713 } else { 714 return -EINVAL; 715 } 716 717 case IIO_CHAN_INFO_CALIBBIAS: 718 *val = priv->calibbias; 719 return IIO_VAL_INT; 720 721 case IIO_CHAN_INFO_CALIBSCALE: 722 *val = priv->calibscale / MILLION; 723 *val2 = priv->calibscale % MILLION; 724 return IIO_VAL_INT_PLUS_MICRO; 725 726 case IIO_CHAN_INFO_OFFSET: 727 *val = DIV_ROUND_CLOSEST(MESON_SAR_ADC_TEMP_OFFSET * 728 priv->param->temperature_divider, 729 priv->param->temperature_multiplier); 730 *val -= priv->temperature_sensor_adc_val; 731 return IIO_VAL_INT; 732 733 default: 734 return -EINVAL; 735 } 736 } 737 738 static int meson_sar_adc_clk_init(struct iio_dev *indio_dev, 739 void __iomem *base) 740 { 741 struct meson_sar_adc_priv *priv = iio_priv(indio_dev); 742 struct device *dev = indio_dev->dev.parent; 743 struct clk_init_data init; 744 const char *clk_parents[1]; 745 746 init.name = devm_kasprintf(dev, GFP_KERNEL, "%s#adc_div", dev_name(dev)); 747 if (!init.name) 748 return -ENOMEM; 749 750 init.flags = 0; 751 init.ops = &clk_divider_ops; 752 clk_parents[0] = __clk_get_name(priv->clkin); 753 init.parent_names = clk_parents; 754 init.num_parents = 1; 755 756 priv->clk_div.reg = base + MESON_SAR_ADC_REG3; 757 priv->clk_div.shift = MESON_SAR_ADC_REG3_ADC_CLK_DIV_SHIFT; 758 priv->clk_div.width = MESON_SAR_ADC_REG3_ADC_CLK_DIV_WIDTH; 759 priv->clk_div.hw.init = &init; 760 priv->clk_div.flags = 0; 761 762 priv->adc_div_clk = devm_clk_register(dev, &priv->clk_div.hw); 763 if (WARN_ON(IS_ERR(priv->adc_div_clk))) 764 return PTR_ERR(priv->adc_div_clk); 765 766 init.name = devm_kasprintf(dev, GFP_KERNEL, "%s#adc_en", dev_name(dev)); 767 if (!init.name) 768 return -ENOMEM; 769 770 init.flags = CLK_SET_RATE_PARENT; 771 init.ops = &clk_gate_ops; 772 clk_parents[0] = __clk_get_name(priv->adc_div_clk); 773 init.parent_names = clk_parents; 774 init.num_parents = 1; 775 776 priv->clk_gate.reg = base + MESON_SAR_ADC_REG3; 777 priv->clk_gate.bit_idx = __ffs(MESON_SAR_ADC_REG3_CLK_EN); 778 priv->clk_gate.hw.init = &init; 779 780 priv->adc_clk = devm_clk_register(dev, &priv->clk_gate.hw); 781 if (WARN_ON(IS_ERR(priv->adc_clk))) 782 return PTR_ERR(priv->adc_clk); 783 784 return 0; 785 } 786 787 static int meson_sar_adc_temp_sensor_init(struct iio_dev *indio_dev) 788 { 789 struct meson_sar_adc_priv *priv = iio_priv(indio_dev); 790 u8 *buf, trimming_bits, trimming_mask, upper_adc_val; 791 struct device *dev = indio_dev->dev.parent; 792 struct nvmem_cell *temperature_calib; 793 size_t read_len; 794 int ret; 795 796 temperature_calib = devm_nvmem_cell_get(dev, "temperature_calib"); 797 if (IS_ERR(temperature_calib)) { 798 ret = PTR_ERR(temperature_calib); 799 800 /* 801 * leave the temperature sensor disabled if no calibration data 802 * was passed via nvmem-cells. 803 */ 804 if (ret == -ENODEV) 805 return 0; 806 807 return dev_err_probe(dev, ret, "failed to get temperature_calib cell\n"); 808 } 809 810 priv->tsc_regmap = syscon_regmap_lookup_by_phandle(dev->of_node, "amlogic,hhi-sysctrl"); 811 if (IS_ERR(priv->tsc_regmap)) 812 return dev_err_probe(dev, PTR_ERR(priv->tsc_regmap), 813 "failed to get amlogic,hhi-sysctrl regmap\n"); 814 815 read_len = MESON_SAR_ADC_EFUSE_BYTES; 816 buf = nvmem_cell_read(temperature_calib, &read_len); 817 if (IS_ERR(buf)) 818 return dev_err_probe(dev, PTR_ERR(buf), "failed to read temperature_calib cell\n"); 819 if (read_len != MESON_SAR_ADC_EFUSE_BYTES) { 820 kfree(buf); 821 return dev_err_probe(dev, -EINVAL, "invalid read size of temperature_calib cell\n"); 822 } 823 824 trimming_bits = priv->param->temperature_trimming_bits; 825 trimming_mask = BIT(trimming_bits) - 1; 826 827 priv->temperature_sensor_calibrated = 828 buf[3] & MESON_SAR_ADC_EFUSE_BYTE3_IS_CALIBRATED; 829 priv->temperature_sensor_coefficient = buf[2] & trimming_mask; 830 831 upper_adc_val = FIELD_GET(MESON_SAR_ADC_EFUSE_BYTE3_UPPER_ADC_VAL, 832 buf[3]); 833 834 priv->temperature_sensor_adc_val = buf[2]; 835 priv->temperature_sensor_adc_val |= upper_adc_val << BITS_PER_BYTE; 836 priv->temperature_sensor_adc_val >>= trimming_bits; 837 838 kfree(buf); 839 840 return 0; 841 } 842 843 static int meson_sar_adc_init(struct iio_dev *indio_dev) 844 { 845 struct meson_sar_adc_priv *priv = iio_priv(indio_dev); 846 struct device *dev = indio_dev->dev.parent; 847 int regval, i, ret; 848 849 /* 850 * make sure we start at CH7 input since the other muxes are only used 851 * for internal calibration. 852 */ 853 meson_sar_adc_set_chan7_mux(indio_dev, CHAN7_MUX_CH7_INPUT); 854 855 if (priv->param->has_bl30_integration) { 856 /* 857 * leave sampling delay and the input clocks as configured by 858 * BL30 to make sure BL30 gets the values it expects when 859 * reading the temperature sensor. 860 */ 861 regmap_read(priv->regmap, MESON_SAR_ADC_REG3, ®val); 862 if (regval & MESON_SAR_ADC_REG3_BL30_INITIALIZED) 863 return 0; 864 } 865 866 meson_sar_adc_stop_sample_engine(indio_dev); 867 868 /* 869 * disable this bit as seems to be only relevant for Meson6 (based 870 * on the vendor driver), which we don't support at the moment. 871 */ 872 regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG0, 873 MESON_SAR_ADC_REG0_ADC_TEMP_SEN_SEL, 0); 874 875 /* disable all channels by default */ 876 regmap_write(priv->regmap, MESON_SAR_ADC_CHAN_LIST, 0x0); 877 878 regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG3, 879 MESON_SAR_ADC_REG3_CTRL_SAMPLING_CLOCK_PHASE, 0); 880 regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG3, 881 MESON_SAR_ADC_REG3_CNTL_USE_SC_DLY, 882 MESON_SAR_ADC_REG3_CNTL_USE_SC_DLY); 883 884 /* delay between two samples = (10+1) * 1uS */ 885 regmap_update_bits(priv->regmap, MESON_SAR_ADC_DELAY, 886 MESON_SAR_ADC_DELAY_INPUT_DLY_CNT_MASK, 887 FIELD_PREP(MESON_SAR_ADC_DELAY_SAMPLE_DLY_CNT_MASK, 888 10)); 889 regmap_update_bits(priv->regmap, MESON_SAR_ADC_DELAY, 890 MESON_SAR_ADC_DELAY_SAMPLE_DLY_SEL_MASK, 891 FIELD_PREP(MESON_SAR_ADC_DELAY_SAMPLE_DLY_SEL_MASK, 892 0)); 893 894 /* delay between two samples = (10+1) * 1uS */ 895 regmap_update_bits(priv->regmap, MESON_SAR_ADC_DELAY, 896 MESON_SAR_ADC_DELAY_INPUT_DLY_CNT_MASK, 897 FIELD_PREP(MESON_SAR_ADC_DELAY_INPUT_DLY_CNT_MASK, 898 10)); 899 regmap_update_bits(priv->regmap, MESON_SAR_ADC_DELAY, 900 MESON_SAR_ADC_DELAY_INPUT_DLY_SEL_MASK, 901 FIELD_PREP(MESON_SAR_ADC_DELAY_INPUT_DLY_SEL_MASK, 902 1)); 903 904 /* 905 * set up the input channel muxes in MESON_SAR_ADC_CHAN_10_SW 906 * (0 = SAR_ADC_CH0, 1 = SAR_ADC_CH1) 907 */ 908 regval = FIELD_PREP(MESON_SAR_ADC_CHAN_10_SW_CHAN0_MUX_SEL_MASK, 0); 909 regmap_update_bits(priv->regmap, MESON_SAR_ADC_CHAN_10_SW, 910 MESON_SAR_ADC_CHAN_10_SW_CHAN0_MUX_SEL_MASK, 911 regval); 912 regval = FIELD_PREP(MESON_SAR_ADC_CHAN_10_SW_CHAN1_MUX_SEL_MASK, 1); 913 regmap_update_bits(priv->regmap, MESON_SAR_ADC_CHAN_10_SW, 914 MESON_SAR_ADC_CHAN_10_SW_CHAN1_MUX_SEL_MASK, 915 regval); 916 917 regmap_update_bits(priv->regmap, MESON_SAR_ADC_CHAN_10_SW, 918 MESON_SAR_ADC_CHAN_10_SW_CHAN0_XP_DRIVE_SW, 919 MESON_SAR_ADC_CHAN_10_SW_CHAN0_XP_DRIVE_SW); 920 921 regmap_update_bits(priv->regmap, MESON_SAR_ADC_CHAN_10_SW, 922 MESON_SAR_ADC_CHAN_10_SW_CHAN0_YP_DRIVE_SW, 923 MESON_SAR_ADC_CHAN_10_SW_CHAN0_YP_DRIVE_SW); 924 925 regmap_update_bits(priv->regmap, MESON_SAR_ADC_CHAN_10_SW, 926 MESON_SAR_ADC_CHAN_10_SW_CHAN1_XP_DRIVE_SW, 927 MESON_SAR_ADC_CHAN_10_SW_CHAN1_XP_DRIVE_SW); 928 929 regmap_update_bits(priv->regmap, MESON_SAR_ADC_CHAN_10_SW, 930 MESON_SAR_ADC_CHAN_10_SW_CHAN1_YP_DRIVE_SW, 931 MESON_SAR_ADC_CHAN_10_SW_CHAN1_YP_DRIVE_SW); 932 933 /* 934 * set up the input channel muxes in MESON_SAR_ADC_AUX_SW 935 * (2 = SAR_ADC_CH2, 3 = SAR_ADC_CH3, ...) and enable 936 * MESON_SAR_ADC_AUX_SW_YP_DRIVE_SW and 937 * MESON_SAR_ADC_AUX_SW_XP_DRIVE_SW like the vendor driver. 938 */ 939 regval = 0; 940 for (i = 2; i <= 7; i++) 941 regval |= i << MESON_SAR_ADC_AUX_SW_MUX_SEL_CHAN_SHIFT(i); 942 regval |= MESON_SAR_ADC_AUX_SW_YP_DRIVE_SW; 943 regval |= MESON_SAR_ADC_AUX_SW_XP_DRIVE_SW; 944 regmap_write(priv->regmap, MESON_SAR_ADC_AUX_SW, regval); 945 946 if (priv->temperature_sensor_calibrated) { 947 regmap_update_bits(priv->regmap, MESON_SAR_ADC_DELTA_10, 948 MESON_SAR_ADC_DELTA_10_TS_REVE1, 949 MESON_SAR_ADC_DELTA_10_TS_REVE1); 950 regmap_update_bits(priv->regmap, MESON_SAR_ADC_DELTA_10, 951 MESON_SAR_ADC_DELTA_10_TS_REVE0, 952 MESON_SAR_ADC_DELTA_10_TS_REVE0); 953 954 /* 955 * set bits [3:0] of the TSC (temperature sensor coefficient) 956 * to get the correct values when reading the temperature. 957 */ 958 regval = FIELD_PREP(MESON_SAR_ADC_DELTA_10_TS_C_MASK, 959 priv->temperature_sensor_coefficient); 960 regmap_update_bits(priv->regmap, MESON_SAR_ADC_DELTA_10, 961 MESON_SAR_ADC_DELTA_10_TS_C_MASK, regval); 962 963 if (priv->param->temperature_trimming_bits == 5) { 964 if (priv->temperature_sensor_coefficient & BIT(4)) 965 regval = MESON_HHI_DPLL_TOP_0_TSC_BIT4; 966 else 967 regval = 0; 968 969 /* 970 * bit [4] (the 5th bit when starting to count at 1) 971 * of the TSC is located in the HHI register area. 972 */ 973 regmap_update_bits(priv->tsc_regmap, 974 MESON_HHI_DPLL_TOP_0, 975 MESON_HHI_DPLL_TOP_0_TSC_BIT4, 976 regval); 977 } 978 } else { 979 regmap_update_bits(priv->regmap, MESON_SAR_ADC_DELTA_10, 980 MESON_SAR_ADC_DELTA_10_TS_REVE1, 0); 981 regmap_update_bits(priv->regmap, MESON_SAR_ADC_DELTA_10, 982 MESON_SAR_ADC_DELTA_10_TS_REVE0, 0); 983 } 984 985 regval = FIELD_PREP(MESON_SAR_ADC_REG3_CTRL_CONT_RING_COUNTER_EN, 986 priv->param->disable_ring_counter); 987 regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG3, 988 MESON_SAR_ADC_REG3_CTRL_CONT_RING_COUNTER_EN, 989 regval); 990 991 if (priv->param->has_reg11) { 992 regval = FIELD_PREP(MESON_SAR_ADC_REG11_EOC, priv->param->adc_eoc); 993 regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG11, 994 MESON_SAR_ADC_REG11_EOC, regval); 995 996 if (priv->param->has_vref_select) { 997 regval = FIELD_PREP(MESON_SAR_ADC_REG11_VREF_SEL, 998 priv->param->vref_select); 999 regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG11, 1000 MESON_SAR_ADC_REG11_VREF_SEL, regval); 1001 } 1002 1003 regval = FIELD_PREP(MESON_SAR_ADC_REG11_VREF_VOLTAGE, 1004 priv->param->vref_volatge); 1005 regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG11, 1006 MESON_SAR_ADC_REG11_VREF_VOLTAGE, regval); 1007 1008 regval = FIELD_PREP(MESON_SAR_ADC_REG11_CMV_SEL, 1009 priv->param->cmv_select); 1010 regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG11, 1011 MESON_SAR_ADC_REG11_CMV_SEL, regval); 1012 } 1013 1014 ret = clk_set_parent(priv->adc_sel_clk, priv->clkin); 1015 if (ret) 1016 return dev_err_probe(dev, ret, "failed to set adc parent to clkin\n"); 1017 1018 ret = clk_set_rate(priv->adc_clk, priv->param->clock_rate); 1019 if (ret) 1020 return dev_err_probe(dev, ret, "failed to set adc clock rate\n"); 1021 1022 return 0; 1023 } 1024 1025 static void meson_sar_adc_set_bandgap(struct iio_dev *indio_dev, bool on_off) 1026 { 1027 struct meson_sar_adc_priv *priv = iio_priv(indio_dev); 1028 const struct meson_sar_adc_param *param = priv->param; 1029 u32 enable_mask; 1030 1031 if (param->bandgap_reg == MESON_SAR_ADC_REG11) 1032 enable_mask = MESON_SAR_ADC_REG11_BANDGAP_EN; 1033 else 1034 enable_mask = MESON_SAR_ADC_DELTA_10_TS_VBG_EN; 1035 1036 regmap_update_bits(priv->regmap, param->bandgap_reg, enable_mask, 1037 on_off ? enable_mask : 0); 1038 } 1039 1040 static int meson_sar_adc_hw_enable(struct iio_dev *indio_dev) 1041 { 1042 struct meson_sar_adc_priv *priv = iio_priv(indio_dev); 1043 struct device *dev = indio_dev->dev.parent; 1044 int ret; 1045 u32 regval; 1046 1047 ret = meson_sar_adc_lock(indio_dev); 1048 if (ret) 1049 goto err_lock; 1050 1051 ret = regulator_enable(priv->vref); 1052 if (ret < 0) { 1053 dev_err(dev, "failed to enable vref regulator\n"); 1054 goto err_vref; 1055 } 1056 1057 regval = FIELD_PREP(MESON_SAR_ADC_REG0_FIFO_CNT_IRQ_MASK, 1); 1058 regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG0, 1059 MESON_SAR_ADC_REG0_FIFO_CNT_IRQ_MASK, regval); 1060 1061 meson_sar_adc_set_bandgap(indio_dev, true); 1062 1063 regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG3, 1064 MESON_SAR_ADC_REG3_ADC_EN, 1065 MESON_SAR_ADC_REG3_ADC_EN); 1066 1067 udelay(5); 1068 1069 ret = clk_prepare_enable(priv->adc_clk); 1070 if (ret) { 1071 dev_err(dev, "failed to enable adc clk\n"); 1072 goto err_adc_clk; 1073 } 1074 1075 meson_sar_adc_unlock(indio_dev); 1076 1077 return 0; 1078 1079 err_adc_clk: 1080 regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG3, 1081 MESON_SAR_ADC_REG3_ADC_EN, 0); 1082 meson_sar_adc_set_bandgap(indio_dev, false); 1083 regulator_disable(priv->vref); 1084 err_vref: 1085 meson_sar_adc_unlock(indio_dev); 1086 err_lock: 1087 return ret; 1088 } 1089 1090 static void meson_sar_adc_hw_disable(struct iio_dev *indio_dev) 1091 { 1092 struct meson_sar_adc_priv *priv = iio_priv(indio_dev); 1093 int ret; 1094 1095 /* 1096 * If taking the lock fails we have to assume that BL30 is broken. The 1097 * best we can do then is to release the resources anyhow. 1098 */ 1099 ret = meson_sar_adc_lock(indio_dev); 1100 if (ret) 1101 dev_err(indio_dev->dev.parent, "Failed to lock ADC (%pE)\n", ERR_PTR(ret)); 1102 1103 clk_disable_unprepare(priv->adc_clk); 1104 1105 regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG3, 1106 MESON_SAR_ADC_REG3_ADC_EN, 0); 1107 1108 meson_sar_adc_set_bandgap(indio_dev, false); 1109 1110 regulator_disable(priv->vref); 1111 1112 if (!ret) 1113 meson_sar_adc_unlock(indio_dev); 1114 } 1115 1116 static irqreturn_t meson_sar_adc_irq(int irq, void *data) 1117 { 1118 struct iio_dev *indio_dev = data; 1119 struct meson_sar_adc_priv *priv = iio_priv(indio_dev); 1120 unsigned int cnt, threshold; 1121 u32 regval; 1122 1123 regmap_read(priv->regmap, MESON_SAR_ADC_REG0, ®val); 1124 cnt = FIELD_GET(MESON_SAR_ADC_REG0_FIFO_COUNT_MASK, regval); 1125 threshold = FIELD_GET(MESON_SAR_ADC_REG0_FIFO_CNT_IRQ_MASK, regval); 1126 1127 if (cnt < threshold) 1128 return IRQ_NONE; 1129 1130 complete(&priv->done); 1131 1132 return IRQ_HANDLED; 1133 } 1134 1135 static int meson_sar_adc_calib(struct iio_dev *indio_dev) 1136 { 1137 struct meson_sar_adc_priv *priv = iio_priv(indio_dev); 1138 int ret, nominal0, nominal1, value0, value1; 1139 1140 /* use points 25% and 75% for calibration */ 1141 nominal0 = (1 << priv->param->resolution) / 4; 1142 nominal1 = (1 << priv->param->resolution) * 3 / 4; 1143 1144 meson_sar_adc_set_chan7_mux(indio_dev, CHAN7_MUX_VDD_DIV4); 1145 usleep_range(10, 20); 1146 ret = meson_sar_adc_get_sample(indio_dev, 1147 find_channel_by_num(indio_dev, 1148 NUM_MUX_1_VDD_DIV4), 1149 MEAN_AVERAGING, EIGHT_SAMPLES, &value0); 1150 if (ret < 0) 1151 goto out; 1152 1153 meson_sar_adc_set_chan7_mux(indio_dev, CHAN7_MUX_VDD_MUL3_DIV4); 1154 usleep_range(10, 20); 1155 ret = meson_sar_adc_get_sample(indio_dev, 1156 find_channel_by_num(indio_dev, 1157 NUM_MUX_3_VDD_MUL3_DIV4), 1158 MEAN_AVERAGING, EIGHT_SAMPLES, &value1); 1159 if (ret < 0) 1160 goto out; 1161 1162 if (value1 <= value0) { 1163 ret = -EINVAL; 1164 goto out; 1165 } 1166 1167 priv->calibscale = div_s64((nominal1 - nominal0) * (s64)MILLION, 1168 value1 - value0); 1169 priv->calibbias = nominal0 - div_s64((s64)value0 * priv->calibscale, 1170 MILLION); 1171 ret = 0; 1172 out: 1173 meson_sar_adc_set_chan7_mux(indio_dev, CHAN7_MUX_CH7_INPUT); 1174 1175 return ret; 1176 } 1177 1178 static int read_label(struct iio_dev *indio_dev, 1179 struct iio_chan_spec const *chan, 1180 char *label) 1181 { 1182 if (chan->type == IIO_TEMP) 1183 return sprintf(label, "temp-sensor\n"); 1184 if (chan->type == IIO_VOLTAGE && chan->channel >= NUM_MUX_0_VSS) 1185 return sprintf(label, "%s\n", 1186 chan7_mux_names[chan->channel - NUM_MUX_0_VSS]); 1187 if (chan->type == IIO_VOLTAGE) 1188 return sprintf(label, "channel-%d\n", chan->channel); 1189 return 0; 1190 } 1191 1192 static const struct iio_info meson_sar_adc_iio_info = { 1193 .read_raw = meson_sar_adc_iio_info_read_raw, 1194 .read_label = read_label, 1195 }; 1196 1197 static const struct meson_sar_adc_param meson_sar_adc_meson8_param = { 1198 .has_bl30_integration = false, 1199 .clock_rate = 1150000, 1200 .bandgap_reg = MESON_SAR_ADC_DELTA_10, 1201 .regmap_config = &meson_sar_adc_regmap_config_meson8, 1202 .resolution = 10, 1203 .temperature_trimming_bits = 4, 1204 .temperature_multiplier = 18 * 10000, 1205 .temperature_divider = 1024 * 10 * 85, 1206 }; 1207 1208 static const struct meson_sar_adc_param meson_sar_adc_meson8b_param = { 1209 .has_bl30_integration = false, 1210 .clock_rate = 1150000, 1211 .bandgap_reg = MESON_SAR_ADC_DELTA_10, 1212 .regmap_config = &meson_sar_adc_regmap_config_meson8, 1213 .resolution = 10, 1214 .temperature_trimming_bits = 5, 1215 .temperature_multiplier = 10, 1216 .temperature_divider = 32, 1217 }; 1218 1219 static const struct meson_sar_adc_param meson_sar_adc_gxbb_param = { 1220 .has_bl30_integration = true, 1221 .clock_rate = 1200000, 1222 .bandgap_reg = MESON_SAR_ADC_REG11, 1223 .regmap_config = &meson_sar_adc_regmap_config_gxbb, 1224 .resolution = 10, 1225 .has_reg11 = true, 1226 .vref_volatge = 1, 1227 .cmv_select = 1, 1228 }; 1229 1230 static const struct meson_sar_adc_param meson_sar_adc_gxl_param = { 1231 .has_bl30_integration = true, 1232 .clock_rate = 1200000, 1233 .bandgap_reg = MESON_SAR_ADC_REG11, 1234 .regmap_config = &meson_sar_adc_regmap_config_gxbb, 1235 .resolution = 12, 1236 .disable_ring_counter = 1, 1237 .has_reg11 = true, 1238 .vref_volatge = 1, 1239 .cmv_select = 1, 1240 }; 1241 1242 static const struct meson_sar_adc_param meson_sar_adc_g12a_param = { 1243 .has_bl30_integration = false, 1244 .clock_rate = 1200000, 1245 .bandgap_reg = MESON_SAR_ADC_REG11, 1246 .regmap_config = &meson_sar_adc_regmap_config_gxbb, 1247 .resolution = 12, 1248 .disable_ring_counter = 1, 1249 .has_reg11 = true, 1250 .adc_eoc = 1, 1251 .has_vref_select = true, 1252 .vref_select = VREF_VDDA, 1253 }; 1254 1255 static const struct meson_sar_adc_data meson_sar_adc_meson8_data = { 1256 .param = &meson_sar_adc_meson8_param, 1257 .name = "meson-meson8-saradc", 1258 }; 1259 1260 static const struct meson_sar_adc_data meson_sar_adc_meson8b_data = { 1261 .param = &meson_sar_adc_meson8b_param, 1262 .name = "meson-meson8b-saradc", 1263 }; 1264 1265 static const struct meson_sar_adc_data meson_sar_adc_meson8m2_data = { 1266 .param = &meson_sar_adc_meson8b_param, 1267 .name = "meson-meson8m2-saradc", 1268 }; 1269 1270 static const struct meson_sar_adc_data meson_sar_adc_gxbb_data = { 1271 .param = &meson_sar_adc_gxbb_param, 1272 .name = "meson-gxbb-saradc", 1273 }; 1274 1275 static const struct meson_sar_adc_data meson_sar_adc_gxl_data = { 1276 .param = &meson_sar_adc_gxl_param, 1277 .name = "meson-gxl-saradc", 1278 }; 1279 1280 static const struct meson_sar_adc_data meson_sar_adc_gxm_data = { 1281 .param = &meson_sar_adc_gxl_param, 1282 .name = "meson-gxm-saradc", 1283 }; 1284 1285 static const struct meson_sar_adc_data meson_sar_adc_axg_data = { 1286 .param = &meson_sar_adc_gxl_param, 1287 .name = "meson-axg-saradc", 1288 }; 1289 1290 static const struct meson_sar_adc_data meson_sar_adc_g12a_data = { 1291 .param = &meson_sar_adc_g12a_param, 1292 .name = "meson-g12a-saradc", 1293 }; 1294 1295 static const struct of_device_id meson_sar_adc_of_match[] = { 1296 { 1297 .compatible = "amlogic,meson8-saradc", 1298 .data = &meson_sar_adc_meson8_data, 1299 }, { 1300 .compatible = "amlogic,meson8b-saradc", 1301 .data = &meson_sar_adc_meson8b_data, 1302 }, { 1303 .compatible = "amlogic,meson8m2-saradc", 1304 .data = &meson_sar_adc_meson8m2_data, 1305 }, { 1306 .compatible = "amlogic,meson-gxbb-saradc", 1307 .data = &meson_sar_adc_gxbb_data, 1308 }, { 1309 .compatible = "amlogic,meson-gxl-saradc", 1310 .data = &meson_sar_adc_gxl_data, 1311 }, { 1312 .compatible = "amlogic,meson-gxm-saradc", 1313 .data = &meson_sar_adc_gxm_data, 1314 }, { 1315 .compatible = "amlogic,meson-axg-saradc", 1316 .data = &meson_sar_adc_axg_data, 1317 }, { 1318 .compatible = "amlogic,meson-g12a-saradc", 1319 .data = &meson_sar_adc_g12a_data, 1320 }, 1321 { /* sentinel */ } 1322 }; 1323 MODULE_DEVICE_TABLE(of, meson_sar_adc_of_match); 1324 1325 static int meson_sar_adc_probe(struct platform_device *pdev) 1326 { 1327 const struct meson_sar_adc_data *match_data; 1328 struct meson_sar_adc_priv *priv; 1329 struct device *dev = &pdev->dev; 1330 struct iio_dev *indio_dev; 1331 void __iomem *base; 1332 int irq, ret; 1333 1334 indio_dev = devm_iio_device_alloc(dev, sizeof(*priv)); 1335 if (!indio_dev) 1336 return dev_err_probe(dev, -ENOMEM, "failed allocating iio device\n"); 1337 1338 priv = iio_priv(indio_dev); 1339 init_completion(&priv->done); 1340 1341 match_data = of_device_get_match_data(dev); 1342 if (!match_data) 1343 return dev_err_probe(dev, -ENODEV, "failed to get match data\n"); 1344 1345 priv->param = match_data->param; 1346 1347 indio_dev->name = match_data->name; 1348 indio_dev->modes = INDIO_DIRECT_MODE; 1349 indio_dev->info = &meson_sar_adc_iio_info; 1350 1351 base = devm_platform_ioremap_resource(pdev, 0); 1352 if (IS_ERR(base)) 1353 return PTR_ERR(base); 1354 1355 priv->regmap = devm_regmap_init_mmio(dev, base, priv->param->regmap_config); 1356 if (IS_ERR(priv->regmap)) 1357 return PTR_ERR(priv->regmap); 1358 1359 irq = irq_of_parse_and_map(dev->of_node, 0); 1360 if (!irq) 1361 return -EINVAL; 1362 1363 ret = devm_request_irq(dev, irq, meson_sar_adc_irq, IRQF_SHARED, dev_name(dev), indio_dev); 1364 if (ret) 1365 return ret; 1366 1367 priv->clkin = devm_clk_get(dev, "clkin"); 1368 if (IS_ERR(priv->clkin)) 1369 return dev_err_probe(dev, PTR_ERR(priv->clkin), "failed to get clkin\n"); 1370 1371 priv->core_clk = devm_clk_get_enabled(dev, "core"); 1372 if (IS_ERR(priv->core_clk)) 1373 return dev_err_probe(dev, PTR_ERR(priv->core_clk), "failed to get core clk\n"); 1374 1375 priv->adc_clk = devm_clk_get_optional(dev, "adc_clk"); 1376 if (IS_ERR(priv->adc_clk)) 1377 return dev_err_probe(dev, PTR_ERR(priv->adc_clk), "failed to get adc clk\n"); 1378 1379 priv->adc_sel_clk = devm_clk_get_optional(dev, "adc_sel"); 1380 if (IS_ERR(priv->adc_sel_clk)) 1381 return dev_err_probe(dev, PTR_ERR(priv->adc_sel_clk), "failed to get adc_sel clk\n"); 1382 1383 /* on pre-GXBB SoCs the SAR ADC itself provides the ADC clock: */ 1384 if (!priv->adc_clk) { 1385 ret = meson_sar_adc_clk_init(indio_dev, base); 1386 if (ret) 1387 return ret; 1388 } 1389 1390 priv->vref = devm_regulator_get(dev, "vref"); 1391 if (IS_ERR(priv->vref)) 1392 return dev_err_probe(dev, PTR_ERR(priv->vref), "failed to get vref regulator\n"); 1393 1394 priv->calibscale = MILLION; 1395 1396 if (priv->param->temperature_trimming_bits) { 1397 ret = meson_sar_adc_temp_sensor_init(indio_dev); 1398 if (ret) 1399 return ret; 1400 } 1401 1402 if (priv->temperature_sensor_calibrated) { 1403 indio_dev->channels = meson_sar_adc_and_temp_iio_channels; 1404 indio_dev->num_channels = 1405 ARRAY_SIZE(meson_sar_adc_and_temp_iio_channels); 1406 } else { 1407 indio_dev->channels = meson_sar_adc_iio_channels; 1408 indio_dev->num_channels = 1409 ARRAY_SIZE(meson_sar_adc_iio_channels); 1410 } 1411 1412 ret = meson_sar_adc_init(indio_dev); 1413 if (ret) 1414 goto err; 1415 1416 mutex_init(&priv->lock); 1417 1418 ret = meson_sar_adc_hw_enable(indio_dev); 1419 if (ret) 1420 goto err; 1421 1422 ret = meson_sar_adc_calib(indio_dev); 1423 if (ret) 1424 dev_warn(dev, "calibration failed\n"); 1425 1426 platform_set_drvdata(pdev, indio_dev); 1427 1428 ret = iio_device_register(indio_dev); 1429 if (ret) 1430 goto err_hw; 1431 1432 return 0; 1433 1434 err_hw: 1435 meson_sar_adc_hw_disable(indio_dev); 1436 err: 1437 return ret; 1438 } 1439 1440 static int meson_sar_adc_remove(struct platform_device *pdev) 1441 { 1442 struct iio_dev *indio_dev = platform_get_drvdata(pdev); 1443 1444 iio_device_unregister(indio_dev); 1445 1446 meson_sar_adc_hw_disable(indio_dev); 1447 1448 return 0; 1449 } 1450 1451 static int meson_sar_adc_suspend(struct device *dev) 1452 { 1453 struct iio_dev *indio_dev = dev_get_drvdata(dev); 1454 struct meson_sar_adc_priv *priv = iio_priv(indio_dev); 1455 1456 meson_sar_adc_hw_disable(indio_dev); 1457 1458 clk_disable_unprepare(priv->core_clk); 1459 1460 return 0; 1461 } 1462 1463 static int meson_sar_adc_resume(struct device *dev) 1464 { 1465 struct iio_dev *indio_dev = dev_get_drvdata(dev); 1466 struct meson_sar_adc_priv *priv = iio_priv(indio_dev); 1467 int ret; 1468 1469 ret = clk_prepare_enable(priv->core_clk); 1470 if (ret) { 1471 dev_err(dev, "failed to enable core clk\n"); 1472 return ret; 1473 } 1474 1475 return meson_sar_adc_hw_enable(indio_dev); 1476 } 1477 1478 static DEFINE_SIMPLE_DEV_PM_OPS(meson_sar_adc_pm_ops, 1479 meson_sar_adc_suspend, meson_sar_adc_resume); 1480 1481 static struct platform_driver meson_sar_adc_driver = { 1482 .probe = meson_sar_adc_probe, 1483 .remove = meson_sar_adc_remove, 1484 .driver = { 1485 .name = "meson-saradc", 1486 .of_match_table = meson_sar_adc_of_match, 1487 .pm = pm_sleep_ptr(&meson_sar_adc_pm_ops), 1488 }, 1489 }; 1490 1491 module_platform_driver(meson_sar_adc_driver); 1492 1493 MODULE_AUTHOR("Martin Blumenstingl <martin.blumenstingl@googlemail.com>"); 1494 MODULE_DESCRIPTION("Amlogic Meson SAR ADC driver"); 1495 MODULE_LICENSE("GPL v2"); 1496