1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * DA9150 GPADC Driver 4 * 5 * Copyright (c) 2014 Dialog Semiconductor 6 * 7 * Author: Adam Thomson <Adam.Thomson.Opensource@diasemi.com> 8 */ 9 10 #include <linux/kernel.h> 11 #include <linux/slab.h> 12 #include <linux/module.h> 13 #include <linux/platform_device.h> 14 #include <linux/interrupt.h> 15 #include <linux/mutex.h> 16 #include <linux/completion.h> 17 #include <linux/iio/iio.h> 18 #include <linux/iio/machine.h> 19 #include <linux/iio/driver.h> 20 #include <linux/mfd/da9150/core.h> 21 #include <linux/mfd/da9150/registers.h> 22 23 /* Channels */ 24 enum da9150_gpadc_hw_channel { 25 DA9150_GPADC_HW_CHAN_GPIOA_2V = 0, 26 DA9150_GPADC_HW_CHAN_GPIOA_2V_, 27 DA9150_GPADC_HW_CHAN_GPIOB_2V, 28 DA9150_GPADC_HW_CHAN_GPIOB_2V_, 29 DA9150_GPADC_HW_CHAN_GPIOC_2V, 30 DA9150_GPADC_HW_CHAN_GPIOC_2V_, 31 DA9150_GPADC_HW_CHAN_GPIOD_2V, 32 DA9150_GPADC_HW_CHAN_GPIOD_2V_, 33 DA9150_GPADC_HW_CHAN_IBUS_SENSE, 34 DA9150_GPADC_HW_CHAN_IBUS_SENSE_, 35 DA9150_GPADC_HW_CHAN_VBUS_DIV, 36 DA9150_GPADC_HW_CHAN_VBUS_DIV_, 37 DA9150_GPADC_HW_CHAN_ID, 38 DA9150_GPADC_HW_CHAN_ID_, 39 DA9150_GPADC_HW_CHAN_VSYS, 40 DA9150_GPADC_HW_CHAN_VSYS_, 41 DA9150_GPADC_HW_CHAN_GPIOA_6V, 42 DA9150_GPADC_HW_CHAN_GPIOA_6V_, 43 DA9150_GPADC_HW_CHAN_GPIOB_6V, 44 DA9150_GPADC_HW_CHAN_GPIOB_6V_, 45 DA9150_GPADC_HW_CHAN_GPIOC_6V, 46 DA9150_GPADC_HW_CHAN_GPIOC_6V_, 47 DA9150_GPADC_HW_CHAN_GPIOD_6V, 48 DA9150_GPADC_HW_CHAN_GPIOD_6V_, 49 DA9150_GPADC_HW_CHAN_VBAT, 50 DA9150_GPADC_HW_CHAN_VBAT_, 51 DA9150_GPADC_HW_CHAN_TBAT, 52 DA9150_GPADC_HW_CHAN_TBAT_, 53 DA9150_GPADC_HW_CHAN_TJUNC_CORE, 54 DA9150_GPADC_HW_CHAN_TJUNC_CORE_, 55 DA9150_GPADC_HW_CHAN_TJUNC_OVP, 56 DA9150_GPADC_HW_CHAN_TJUNC_OVP_, 57 }; 58 59 enum da9150_gpadc_channel { 60 DA9150_GPADC_CHAN_GPIOA = 0, 61 DA9150_GPADC_CHAN_GPIOB, 62 DA9150_GPADC_CHAN_GPIOC, 63 DA9150_GPADC_CHAN_GPIOD, 64 DA9150_GPADC_CHAN_IBUS, 65 DA9150_GPADC_CHAN_VBUS, 66 DA9150_GPADC_CHAN_VSYS, 67 DA9150_GPADC_CHAN_VBAT, 68 DA9150_GPADC_CHAN_TBAT, 69 DA9150_GPADC_CHAN_TJUNC_CORE, 70 DA9150_GPADC_CHAN_TJUNC_OVP, 71 }; 72 73 /* Private data */ 74 struct da9150_gpadc { 75 struct da9150 *da9150; 76 struct device *dev; 77 78 struct mutex lock; 79 struct completion complete; 80 }; 81 82 83 static irqreturn_t da9150_gpadc_irq(int irq, void *data) 84 { 85 86 struct da9150_gpadc *gpadc = data; 87 88 complete(&gpadc->complete); 89 90 return IRQ_HANDLED; 91 } 92 93 static int da9150_gpadc_read_adc(struct da9150_gpadc *gpadc, int hw_chan) 94 { 95 u8 result_regs[2]; 96 int result; 97 98 mutex_lock(&gpadc->lock); 99 100 /* Set channel & enable measurement */ 101 da9150_reg_write(gpadc->da9150, DA9150_GPADC_MAN, 102 (DA9150_GPADC_EN_MASK | 103 hw_chan << DA9150_GPADC_MUX_SHIFT)); 104 105 /* Consume left-over completion from a previous timeout */ 106 try_wait_for_completion(&gpadc->complete); 107 108 /* Check for actual completion */ 109 wait_for_completion_timeout(&gpadc->complete, msecs_to_jiffies(5)); 110 111 /* Read result and status from device */ 112 da9150_bulk_read(gpadc->da9150, DA9150_GPADC_RES_A, 2, result_regs); 113 114 mutex_unlock(&gpadc->lock); 115 116 /* Check to make sure device really has completed reading */ 117 if (result_regs[1] & DA9150_GPADC_RUN_MASK) { 118 dev_err(gpadc->dev, "Timeout on channel %d of GPADC\n", 119 hw_chan); 120 return -ETIMEDOUT; 121 } 122 123 /* LSBs - 2 bits */ 124 result = (result_regs[1] & DA9150_GPADC_RES_L_MASK) >> 125 DA9150_GPADC_RES_L_SHIFT; 126 /* MSBs - 8 bits */ 127 result |= result_regs[0] << DA9150_GPADC_RES_L_BITS; 128 129 return result; 130 } 131 132 static inline int da9150_gpadc_gpio_6v_voltage_now(int raw_val) 133 { 134 /* Convert to mV */ 135 return (6 * ((raw_val * 1000) + 500)) / 1024; 136 } 137 138 static inline int da9150_gpadc_ibus_current_avg(int raw_val) 139 { 140 /* Convert to mA */ 141 return (4 * ((raw_val * 1000) + 500)) / 2048; 142 } 143 144 static inline int da9150_gpadc_vbus_21v_voltage_now(int raw_val) 145 { 146 /* Convert to mV */ 147 return (21 * ((raw_val * 1000) + 500)) / 1024; 148 } 149 150 static inline int da9150_gpadc_vsys_6v_voltage_now(int raw_val) 151 { 152 /* Convert to mV */ 153 return (3 * ((raw_val * 1000) + 500)) / 512; 154 } 155 156 static int da9150_gpadc_read_processed(struct da9150_gpadc *gpadc, int channel, 157 int hw_chan, int *val) 158 { 159 int raw_val; 160 161 raw_val = da9150_gpadc_read_adc(gpadc, hw_chan); 162 if (raw_val < 0) 163 return raw_val; 164 165 switch (channel) { 166 case DA9150_GPADC_CHAN_GPIOA: 167 case DA9150_GPADC_CHAN_GPIOB: 168 case DA9150_GPADC_CHAN_GPIOC: 169 case DA9150_GPADC_CHAN_GPIOD: 170 *val = da9150_gpadc_gpio_6v_voltage_now(raw_val); 171 break; 172 case DA9150_GPADC_CHAN_IBUS: 173 *val = da9150_gpadc_ibus_current_avg(raw_val); 174 break; 175 case DA9150_GPADC_CHAN_VBUS: 176 *val = da9150_gpadc_vbus_21v_voltage_now(raw_val); 177 break; 178 case DA9150_GPADC_CHAN_VSYS: 179 *val = da9150_gpadc_vsys_6v_voltage_now(raw_val); 180 break; 181 default: 182 /* No processing for other channels so return raw value */ 183 *val = raw_val; 184 break; 185 } 186 187 return IIO_VAL_INT; 188 } 189 190 static int da9150_gpadc_read_scale(int channel, int *val, int *val2) 191 { 192 switch (channel) { 193 case DA9150_GPADC_CHAN_VBAT: 194 *val = 2932; 195 *val2 = 1000; 196 return IIO_VAL_FRACTIONAL; 197 case DA9150_GPADC_CHAN_TJUNC_CORE: 198 case DA9150_GPADC_CHAN_TJUNC_OVP: 199 *val = 1000000; 200 *val2 = 4420; 201 return IIO_VAL_FRACTIONAL; 202 default: 203 return -EINVAL; 204 } 205 } 206 207 static int da9150_gpadc_read_offset(int channel, int *val) 208 { 209 switch (channel) { 210 case DA9150_GPADC_CHAN_VBAT: 211 *val = 1500000 / 2932; 212 return IIO_VAL_INT; 213 case DA9150_GPADC_CHAN_TJUNC_CORE: 214 case DA9150_GPADC_CHAN_TJUNC_OVP: 215 *val = -144; 216 return IIO_VAL_INT; 217 default: 218 return -EINVAL; 219 } 220 } 221 222 static int da9150_gpadc_read_raw(struct iio_dev *indio_dev, 223 struct iio_chan_spec const *chan, 224 int *val, int *val2, long mask) 225 { 226 struct da9150_gpadc *gpadc = iio_priv(indio_dev); 227 228 if ((chan->channel < DA9150_GPADC_CHAN_GPIOA) || 229 (chan->channel > DA9150_GPADC_CHAN_TJUNC_OVP)) 230 return -EINVAL; 231 232 switch (mask) { 233 case IIO_CHAN_INFO_RAW: 234 case IIO_CHAN_INFO_PROCESSED: 235 return da9150_gpadc_read_processed(gpadc, chan->channel, 236 chan->address, val); 237 case IIO_CHAN_INFO_SCALE: 238 return da9150_gpadc_read_scale(chan->channel, val, val2); 239 case IIO_CHAN_INFO_OFFSET: 240 return da9150_gpadc_read_offset(chan->channel, val); 241 default: 242 return -EINVAL; 243 } 244 } 245 246 static const struct iio_info da9150_gpadc_info = { 247 .read_raw = &da9150_gpadc_read_raw, 248 }; 249 250 #define DA9150_GPADC_CHANNEL(_id, _hw_id, _type, chan_info, \ 251 _ext_name) { \ 252 .type = _type, \ 253 .indexed = 1, \ 254 .channel = DA9150_GPADC_CHAN_##_id, \ 255 .address = DA9150_GPADC_HW_CHAN_##_hw_id, \ 256 .info_mask_separate = chan_info, \ 257 .extend_name = _ext_name, \ 258 .datasheet_name = #_id, \ 259 } 260 261 #define DA9150_GPADC_CHANNEL_RAW(_id, _hw_id, _type, _ext_name) \ 262 DA9150_GPADC_CHANNEL(_id, _hw_id, _type, \ 263 BIT(IIO_CHAN_INFO_RAW), _ext_name) 264 265 #define DA9150_GPADC_CHANNEL_SCALED(_id, _hw_id, _type, _ext_name) \ 266 DA9150_GPADC_CHANNEL(_id, _hw_id, _type, \ 267 BIT(IIO_CHAN_INFO_RAW) | \ 268 BIT(IIO_CHAN_INFO_SCALE) | \ 269 BIT(IIO_CHAN_INFO_OFFSET), \ 270 _ext_name) 271 272 #define DA9150_GPADC_CHANNEL_PROCESSED(_id, _hw_id, _type, _ext_name) \ 273 DA9150_GPADC_CHANNEL(_id, _hw_id, _type, \ 274 BIT(IIO_CHAN_INFO_PROCESSED), _ext_name) 275 276 /* Supported channels */ 277 static const struct iio_chan_spec da9150_gpadc_channels[] = { 278 DA9150_GPADC_CHANNEL_PROCESSED(GPIOA, GPIOA_6V, IIO_VOLTAGE, NULL), 279 DA9150_GPADC_CHANNEL_PROCESSED(GPIOB, GPIOB_6V, IIO_VOLTAGE, NULL), 280 DA9150_GPADC_CHANNEL_PROCESSED(GPIOC, GPIOC_6V, IIO_VOLTAGE, NULL), 281 DA9150_GPADC_CHANNEL_PROCESSED(GPIOD, GPIOD_6V, IIO_VOLTAGE, NULL), 282 DA9150_GPADC_CHANNEL_PROCESSED(IBUS, IBUS_SENSE, IIO_CURRENT, "ibus"), 283 DA9150_GPADC_CHANNEL_PROCESSED(VBUS, VBUS_DIV_, IIO_VOLTAGE, "vbus"), 284 DA9150_GPADC_CHANNEL_PROCESSED(VSYS, VSYS, IIO_VOLTAGE, "vsys"), 285 DA9150_GPADC_CHANNEL_SCALED(VBAT, VBAT, IIO_VOLTAGE, "vbat"), 286 DA9150_GPADC_CHANNEL_RAW(TBAT, TBAT, IIO_VOLTAGE, "tbat"), 287 DA9150_GPADC_CHANNEL_SCALED(TJUNC_CORE, TJUNC_CORE, IIO_TEMP, 288 "tjunc_core"), 289 DA9150_GPADC_CHANNEL_SCALED(TJUNC_OVP, TJUNC_OVP, IIO_TEMP, 290 "tjunc_ovp"), 291 }; 292 293 /* Default maps used by da9150-charger */ 294 static struct iio_map da9150_gpadc_default_maps[] = { 295 { 296 .consumer_dev_name = "da9150-charger", 297 .consumer_channel = "CHAN_IBUS", 298 .adc_channel_label = "IBUS", 299 }, 300 { 301 .consumer_dev_name = "da9150-charger", 302 .consumer_channel = "CHAN_VBUS", 303 .adc_channel_label = "VBUS", 304 }, 305 { 306 .consumer_dev_name = "da9150-charger", 307 .consumer_channel = "CHAN_TJUNC", 308 .adc_channel_label = "TJUNC_CORE", 309 }, 310 { 311 .consumer_dev_name = "da9150-charger", 312 .consumer_channel = "CHAN_VBAT", 313 .adc_channel_label = "VBAT", 314 }, 315 {}, 316 }; 317 318 static int da9150_gpadc_probe(struct platform_device *pdev) 319 { 320 struct device *dev = &pdev->dev; 321 struct da9150 *da9150 = dev_get_drvdata(dev->parent); 322 struct da9150_gpadc *gpadc; 323 struct iio_dev *indio_dev; 324 int irq, ret; 325 326 indio_dev = devm_iio_device_alloc(dev, sizeof(*gpadc)); 327 if (!indio_dev) { 328 dev_err(&pdev->dev, "Failed to allocate IIO device\n"); 329 return -ENOMEM; 330 } 331 gpadc = iio_priv(indio_dev); 332 333 gpadc->da9150 = da9150; 334 gpadc->dev = dev; 335 mutex_init(&gpadc->lock); 336 init_completion(&gpadc->complete); 337 338 irq = platform_get_irq_byname(pdev, "GPADC"); 339 if (irq < 0) 340 return irq; 341 342 ret = devm_request_threaded_irq(dev, irq, NULL, da9150_gpadc_irq, 343 IRQF_ONESHOT, "GPADC", gpadc); 344 if (ret) { 345 dev_err(dev, "Failed to request IRQ %d: %d\n", irq, ret); 346 return ret; 347 } 348 349 ret = devm_iio_map_array_register(&pdev->dev, indio_dev, da9150_gpadc_default_maps); 350 if (ret) { 351 dev_err(dev, "Failed to register IIO maps: %d\n", ret); 352 return ret; 353 } 354 355 indio_dev->name = dev_name(dev); 356 indio_dev->info = &da9150_gpadc_info; 357 indio_dev->modes = INDIO_DIRECT_MODE; 358 indio_dev->channels = da9150_gpadc_channels; 359 indio_dev->num_channels = ARRAY_SIZE(da9150_gpadc_channels); 360 361 return devm_iio_device_register(&pdev->dev, indio_dev); 362 } 363 364 static struct platform_driver da9150_gpadc_driver = { 365 .driver = { 366 .name = "da9150-gpadc", 367 }, 368 .probe = da9150_gpadc_probe, 369 }; 370 371 module_platform_driver(da9150_gpadc_driver); 372 373 MODULE_DESCRIPTION("GPADC Driver for DA9150"); 374 MODULE_AUTHOR("Adam Thomson <Adam.Thomson.Opensource@diasemi.com>"); 375 MODULE_LICENSE("GPL"); 376