Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) ST-Ericsson SA 2010 |
| 3 | * |
| 4 | * License Terms: GNU General Public License v2 |
| 5 | * Author: Arun R Murthy <arun.murthy@stericsson.com> |
Daniel Willerud | 6321992 | 2011-03-05 11:46:13 +0100 | [diff] [blame] | 6 | * Author: Daniel Willerud <daniel.willerud@stericsson.com> |
Johan Palsson | 586f331 | 2011-03-05 11:46:37 +0100 | [diff] [blame] | 7 | * Author: Johan Palsson <johan.palsson@stericsson.com> |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 8 | */ |
| 9 | #include <linux/init.h> |
| 10 | #include <linux/module.h> |
| 11 | #include <linux/device.h> |
| 12 | #include <linux/interrupt.h> |
| 13 | #include <linux/spinlock.h> |
| 14 | #include <linux/delay.h> |
| 15 | #include <linux/platform_device.h> |
| 16 | #include <linux/completion.h> |
| 17 | #include <linux/regulator/consumer.h> |
| 18 | #include <linux/err.h> |
| 19 | #include <linux/slab.h> |
Daniel Willerud | 6321992 | 2011-03-05 11:46:13 +0100 | [diff] [blame] | 20 | #include <linux/list.h> |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 21 | #include <linux/mfd/abx500.h> |
Linus Walleij | ee66e65 | 2011-12-02 14:16:33 +0100 | [diff] [blame] | 22 | #include <linux/mfd/abx500/ab8500.h> |
| 23 | #include <linux/mfd/abx500/ab8500-gpadc.h> |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 24 | |
| 25 | /* |
| 26 | * GPADC register offsets |
| 27 | * Bank : 0x0A |
| 28 | */ |
| 29 | #define AB8500_GPADC_CTRL1_REG 0x00 |
| 30 | #define AB8500_GPADC_CTRL2_REG 0x01 |
| 31 | #define AB8500_GPADC_CTRL3_REG 0x02 |
| 32 | #define AB8500_GPADC_AUTO_TIMER_REG 0x03 |
| 33 | #define AB8500_GPADC_STAT_REG 0x04 |
| 34 | #define AB8500_GPADC_MANDATAL_REG 0x05 |
| 35 | #define AB8500_GPADC_MANDATAH_REG 0x06 |
| 36 | #define AB8500_GPADC_AUTODATAL_REG 0x07 |
| 37 | #define AB8500_GPADC_AUTODATAH_REG 0x08 |
| 38 | #define AB8500_GPADC_MUX_CTRL_REG 0x09 |
| 39 | |
Johan Palsson | 586f331 | 2011-03-05 11:46:37 +0100 | [diff] [blame] | 40 | /* |
| 41 | * OTP register offsets |
| 42 | * Bank : 0x15 |
| 43 | */ |
| 44 | #define AB8500_GPADC_CAL_1 0x0F |
| 45 | #define AB8500_GPADC_CAL_2 0x10 |
| 46 | #define AB8500_GPADC_CAL_3 0x11 |
| 47 | #define AB8500_GPADC_CAL_4 0x12 |
| 48 | #define AB8500_GPADC_CAL_5 0x13 |
| 49 | #define AB8500_GPADC_CAL_6 0x14 |
| 50 | #define AB8500_GPADC_CAL_7 0x15 |
| 51 | |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 52 | /* gpadc constants */ |
| 53 | #define EN_VINTCORE12 0x04 |
| 54 | #define EN_VTVOUT 0x02 |
| 55 | #define EN_GPADC 0x01 |
| 56 | #define DIS_GPADC 0x00 |
| 57 | #define SW_AVG_16 0x60 |
| 58 | #define ADC_SW_CONV 0x04 |
Karl Komierowski | 4aad5a9 | 2011-03-05 11:46:45 +0100 | [diff] [blame] | 59 | #define EN_ICHAR 0x80 |
Johan Palsson | ed13941 | 2011-05-08 00:55:43 +0200 | [diff] [blame] | 60 | #define BTEMP_PULL_UP 0x08 |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 61 | #define EN_BUF 0x40 |
| 62 | #define DIS_ZERO 0x00 |
| 63 | #define GPADC_BUSY 0x01 |
| 64 | |
Johan Palsson | 586f331 | 2011-03-05 11:46:37 +0100 | [diff] [blame] | 65 | /* GPADC constants from AB8500 spec, UM0836 */ |
| 66 | #define ADC_RESOLUTION 1024 |
| 67 | #define ADC_CH_BTEMP_MIN 0 |
| 68 | #define ADC_CH_BTEMP_MAX 1350 |
| 69 | #define ADC_CH_DIETEMP_MIN 0 |
| 70 | #define ADC_CH_DIETEMP_MAX 1350 |
| 71 | #define ADC_CH_CHG_V_MIN 0 |
| 72 | #define ADC_CH_CHG_V_MAX 20030 |
| 73 | #define ADC_CH_ACCDET2_MIN 0 |
| 74 | #define ADC_CH_ACCDET2_MAX 2500 |
| 75 | #define ADC_CH_VBAT_MIN 2300 |
| 76 | #define ADC_CH_VBAT_MAX 4800 |
| 77 | #define ADC_CH_CHG_I_MIN 0 |
| 78 | #define ADC_CH_CHG_I_MAX 1500 |
| 79 | #define ADC_CH_BKBAT_MIN 0 |
| 80 | #define ADC_CH_BKBAT_MAX 3200 |
| 81 | |
| 82 | /* This is used to not lose precision when dividing to get gain and offset */ |
| 83 | #define CALIB_SCALE 1000 |
| 84 | |
| 85 | enum cal_channels { |
| 86 | ADC_INPUT_VMAIN = 0, |
| 87 | ADC_INPUT_BTEMP, |
| 88 | ADC_INPUT_VBAT, |
| 89 | NBR_CAL_INPUTS, |
| 90 | }; |
| 91 | |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 92 | /** |
Johan Palsson | 586f331 | 2011-03-05 11:46:37 +0100 | [diff] [blame] | 93 | * struct adc_cal_data - Table for storing gain and offset for the calibrated |
| 94 | * ADC channels |
| 95 | * @gain: Gain of the ADC channel |
| 96 | * @offset: Offset of the ADC channel |
| 97 | */ |
| 98 | struct adc_cal_data { |
| 99 | u64 gain; |
| 100 | u64 offset; |
| 101 | }; |
| 102 | |
| 103 | /** |
| 104 | * struct ab8500_gpadc - AB8500 GPADC device information |
Karl Komierowski | c9c9513 | 2011-05-08 00:55:31 +0200 | [diff] [blame] | 105 | * @chip_id ABB chip id |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 106 | * @dev: pointer to the struct device |
Daniel Willerud | 6321992 | 2011-03-05 11:46:13 +0100 | [diff] [blame] | 107 | * @node: a list of AB8500 GPADCs, hence prepared for |
| 108 | reentrance |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 109 | * @ab8500_gpadc_complete: pointer to the struct completion, to indicate |
| 110 | * the completion of gpadc conversion |
| 111 | * @ab8500_gpadc_lock: structure of type mutex |
| 112 | * @regu: pointer to the struct regulator |
| 113 | * @irq: interrupt number that is used by gpadc |
Johan Palsson | 586f331 | 2011-03-05 11:46:37 +0100 | [diff] [blame] | 114 | * @cal_data array of ADC calibration data structs |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 115 | */ |
Daniel Willerud | 6321992 | 2011-03-05 11:46:13 +0100 | [diff] [blame] | 116 | struct ab8500_gpadc { |
Karl Komierowski | c9c9513 | 2011-05-08 00:55:31 +0200 | [diff] [blame] | 117 | u8 chip_id; |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 118 | struct device *dev; |
Daniel Willerud | 6321992 | 2011-03-05 11:46:13 +0100 | [diff] [blame] | 119 | struct list_head node; |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 120 | struct completion ab8500_gpadc_complete; |
| 121 | struct mutex ab8500_gpadc_lock; |
| 122 | struct regulator *regu; |
| 123 | int irq; |
Johan Palsson | 586f331 | 2011-03-05 11:46:37 +0100 | [diff] [blame] | 124 | struct adc_cal_data cal_data[NBR_CAL_INPUTS]; |
Daniel Willerud | 6321992 | 2011-03-05 11:46:13 +0100 | [diff] [blame] | 125 | }; |
| 126 | |
| 127 | static LIST_HEAD(ab8500_gpadc_list); |
| 128 | |
| 129 | /** |
| 130 | * ab8500_gpadc_get() - returns a reference to the primary AB8500 GPADC |
| 131 | * (i.e. the first GPADC in the instance list) |
| 132 | */ |
| 133 | struct ab8500_gpadc *ab8500_gpadc_get(char *name) |
| 134 | { |
| 135 | struct ab8500_gpadc *gpadc; |
| 136 | |
| 137 | list_for_each_entry(gpadc, &ab8500_gpadc_list, node) { |
| 138 | if (!strcmp(name, dev_name(gpadc->dev))) |
| 139 | return gpadc; |
| 140 | } |
| 141 | |
| 142 | return ERR_PTR(-ENOENT); |
| 143 | } |
| 144 | EXPORT_SYMBOL(ab8500_gpadc_get); |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 145 | |
Karl Komierowski | bd4a40b | 2011-08-10 15:09:43 +0200 | [diff] [blame] | 146 | /** |
| 147 | * ab8500_gpadc_ad_to_voltage() - Convert a raw ADC value to a voltage |
| 148 | */ |
| 149 | int ab8500_gpadc_ad_to_voltage(struct ab8500_gpadc *gpadc, u8 channel, |
Johan Palsson | 586f331 | 2011-03-05 11:46:37 +0100 | [diff] [blame] | 150 | int ad_value) |
| 151 | { |
| 152 | int res; |
| 153 | |
Karl Komierowski | bd4a40b | 2011-08-10 15:09:43 +0200 | [diff] [blame] | 154 | switch (channel) { |
Johan Palsson | 586f331 | 2011-03-05 11:46:37 +0100 | [diff] [blame] | 155 | case MAIN_CHARGER_V: |
| 156 | /* For some reason we don't have calibrated data */ |
| 157 | if (!gpadc->cal_data[ADC_INPUT_VMAIN].gain) { |
| 158 | res = ADC_CH_CHG_V_MIN + (ADC_CH_CHG_V_MAX - |
| 159 | ADC_CH_CHG_V_MIN) * ad_value / |
| 160 | ADC_RESOLUTION; |
| 161 | break; |
| 162 | } |
| 163 | /* Here we can use the calibrated data */ |
| 164 | res = (int) (ad_value * gpadc->cal_data[ADC_INPUT_VMAIN].gain + |
| 165 | gpadc->cal_data[ADC_INPUT_VMAIN].offset) / CALIB_SCALE; |
| 166 | break; |
| 167 | |
| 168 | case BAT_CTRL: |
| 169 | case BTEMP_BALL: |
| 170 | case ACC_DETECT1: |
| 171 | case ADC_AUX1: |
| 172 | case ADC_AUX2: |
| 173 | /* For some reason we don't have calibrated data */ |
| 174 | if (!gpadc->cal_data[ADC_INPUT_BTEMP].gain) { |
| 175 | res = ADC_CH_BTEMP_MIN + (ADC_CH_BTEMP_MAX - |
| 176 | ADC_CH_BTEMP_MIN) * ad_value / |
| 177 | ADC_RESOLUTION; |
| 178 | break; |
| 179 | } |
| 180 | /* Here we can use the calibrated data */ |
| 181 | res = (int) (ad_value * gpadc->cal_data[ADC_INPUT_BTEMP].gain + |
| 182 | gpadc->cal_data[ADC_INPUT_BTEMP].offset) / CALIB_SCALE; |
| 183 | break; |
| 184 | |
| 185 | case MAIN_BAT_V: |
| 186 | /* For some reason we don't have calibrated data */ |
| 187 | if (!gpadc->cal_data[ADC_INPUT_VBAT].gain) { |
| 188 | res = ADC_CH_VBAT_MIN + (ADC_CH_VBAT_MAX - |
| 189 | ADC_CH_VBAT_MIN) * ad_value / |
| 190 | ADC_RESOLUTION; |
| 191 | break; |
| 192 | } |
| 193 | /* Here we can use the calibrated data */ |
| 194 | res = (int) (ad_value * gpadc->cal_data[ADC_INPUT_VBAT].gain + |
| 195 | gpadc->cal_data[ADC_INPUT_VBAT].offset) / CALIB_SCALE; |
| 196 | break; |
| 197 | |
| 198 | case DIE_TEMP: |
| 199 | res = ADC_CH_DIETEMP_MIN + |
| 200 | (ADC_CH_DIETEMP_MAX - ADC_CH_DIETEMP_MIN) * ad_value / |
| 201 | ADC_RESOLUTION; |
| 202 | break; |
| 203 | |
| 204 | case ACC_DETECT2: |
| 205 | res = ADC_CH_ACCDET2_MIN + |
| 206 | (ADC_CH_ACCDET2_MAX - ADC_CH_ACCDET2_MIN) * ad_value / |
| 207 | ADC_RESOLUTION; |
| 208 | break; |
| 209 | |
| 210 | case VBUS_V: |
| 211 | res = ADC_CH_CHG_V_MIN + |
| 212 | (ADC_CH_CHG_V_MAX - ADC_CH_CHG_V_MIN) * ad_value / |
| 213 | ADC_RESOLUTION; |
| 214 | break; |
| 215 | |
| 216 | case MAIN_CHARGER_C: |
| 217 | case USB_CHARGER_C: |
| 218 | res = ADC_CH_CHG_I_MIN + |
| 219 | (ADC_CH_CHG_I_MAX - ADC_CH_CHG_I_MIN) * ad_value / |
| 220 | ADC_RESOLUTION; |
| 221 | break; |
| 222 | |
| 223 | case BK_BAT_V: |
| 224 | res = ADC_CH_BKBAT_MIN + |
| 225 | (ADC_CH_BKBAT_MAX - ADC_CH_BKBAT_MIN) * ad_value / |
| 226 | ADC_RESOLUTION; |
| 227 | break; |
| 228 | |
| 229 | default: |
| 230 | dev_err(gpadc->dev, |
| 231 | "unknown channel, not possible to convert\n"); |
| 232 | res = -EINVAL; |
| 233 | break; |
| 234 | |
| 235 | } |
| 236 | return res; |
| 237 | } |
Karl Komierowski | bd4a40b | 2011-08-10 15:09:43 +0200 | [diff] [blame] | 238 | EXPORT_SYMBOL(ab8500_gpadc_ad_to_voltage); |
Johan Palsson | 586f331 | 2011-03-05 11:46:37 +0100 | [diff] [blame] | 239 | |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 240 | /** |
| 241 | * ab8500_gpadc_convert() - gpadc conversion |
Karl Komierowski | bd4a40b | 2011-08-10 15:09:43 +0200 | [diff] [blame] | 242 | * @channel: analog channel to be converted to digital data |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 243 | * |
| 244 | * This function converts the selected analog i/p to digital |
Johan Palsson | 586f331 | 2011-03-05 11:46:37 +0100 | [diff] [blame] | 245 | * data. |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 246 | */ |
Karl Komierowski | bd4a40b | 2011-08-10 15:09:43 +0200 | [diff] [blame] | 247 | int ab8500_gpadc_convert(struct ab8500_gpadc *gpadc, u8 channel) |
| 248 | { |
| 249 | int ad_value; |
| 250 | int voltage; |
| 251 | |
| 252 | ad_value = ab8500_gpadc_read_raw(gpadc, channel); |
| 253 | if (ad_value < 0) { |
| 254 | dev_err(gpadc->dev, "GPADC raw value failed ch: %d\n", channel); |
| 255 | return ad_value; |
| 256 | } |
| 257 | |
| 258 | voltage = ab8500_gpadc_ad_to_voltage(gpadc, channel, ad_value); |
| 259 | |
| 260 | if (voltage < 0) |
| 261 | dev_err(gpadc->dev, "GPADC to voltage conversion failed ch:" |
| 262 | " %d AD: 0x%x\n", channel, ad_value); |
| 263 | |
| 264 | return voltage; |
| 265 | } |
| 266 | EXPORT_SYMBOL(ab8500_gpadc_convert); |
| 267 | |
| 268 | /** |
| 269 | * ab8500_gpadc_read_raw() - gpadc read |
| 270 | * @channel: analog channel to be read |
| 271 | * |
| 272 | * This function obtains the raw ADC value, this then needs |
| 273 | * to be converted by calling ab8500_gpadc_ad_to_voltage() |
| 274 | */ |
| 275 | int ab8500_gpadc_read_raw(struct ab8500_gpadc *gpadc, u8 channel) |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 276 | { |
| 277 | int ret; |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 278 | int looplimit = 0; |
| 279 | u8 val, low_data, high_data; |
| 280 | |
Daniel Willerud | 6321992 | 2011-03-05 11:46:13 +0100 | [diff] [blame] | 281 | if (!gpadc) |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 282 | return -ENODEV; |
| 283 | |
Daniel Willerud | 6321992 | 2011-03-05 11:46:13 +0100 | [diff] [blame] | 284 | mutex_lock(&gpadc->ab8500_gpadc_lock); |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 285 | /* Enable VTVout LDO this is required for GPADC */ |
Daniel Willerud | 6321992 | 2011-03-05 11:46:13 +0100 | [diff] [blame] | 286 | regulator_enable(gpadc->regu); |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 287 | |
| 288 | /* Check if ADC is not busy, lock and proceed */ |
| 289 | do { |
Daniel Willerud | 6321992 | 2011-03-05 11:46:13 +0100 | [diff] [blame] | 290 | ret = abx500_get_register_interruptible(gpadc->dev, |
| 291 | AB8500_GPADC, AB8500_GPADC_STAT_REG, &val); |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 292 | if (ret < 0) |
| 293 | goto out; |
| 294 | if (!(val & GPADC_BUSY)) |
| 295 | break; |
| 296 | msleep(10); |
| 297 | } while (++looplimit < 10); |
| 298 | if (looplimit >= 10 && (val & GPADC_BUSY)) { |
Daniel Willerud | 6321992 | 2011-03-05 11:46:13 +0100 | [diff] [blame] | 299 | dev_err(gpadc->dev, "gpadc_conversion: GPADC busy"); |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 300 | ret = -EINVAL; |
| 301 | goto out; |
| 302 | } |
| 303 | |
| 304 | /* Enable GPADC */ |
Daniel Willerud | 6321992 | 2011-03-05 11:46:13 +0100 | [diff] [blame] | 305 | ret = abx500_mask_and_set_register_interruptible(gpadc->dev, |
| 306 | AB8500_GPADC, AB8500_GPADC_CTRL1_REG, EN_GPADC, EN_GPADC); |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 307 | if (ret < 0) { |
Daniel Willerud | 6321992 | 2011-03-05 11:46:13 +0100 | [diff] [blame] | 308 | dev_err(gpadc->dev, "gpadc_conversion: enable gpadc failed\n"); |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 309 | goto out; |
| 310 | } |
Karl Komierowski | c9c9513 | 2011-05-08 00:55:31 +0200 | [diff] [blame] | 311 | |
Karl Komierowski | bd4a40b | 2011-08-10 15:09:43 +0200 | [diff] [blame] | 312 | /* Select the channel source and set average samples to 16 */ |
Daniel Willerud | 6321992 | 2011-03-05 11:46:13 +0100 | [diff] [blame] | 313 | ret = abx500_set_register_interruptible(gpadc->dev, AB8500_GPADC, |
Karl Komierowski | bd4a40b | 2011-08-10 15:09:43 +0200 | [diff] [blame] | 314 | AB8500_GPADC_CTRL2_REG, (channel | SW_AVG_16)); |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 315 | if (ret < 0) { |
Daniel Willerud | 6321992 | 2011-03-05 11:46:13 +0100 | [diff] [blame] | 316 | dev_err(gpadc->dev, |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 317 | "gpadc_conversion: set avg samples failed\n"); |
| 318 | goto out; |
| 319 | } |
Karl Komierowski | c9c9513 | 2011-05-08 00:55:31 +0200 | [diff] [blame] | 320 | |
Karl Komierowski | 4aad5a9 | 2011-03-05 11:46:45 +0100 | [diff] [blame] | 321 | /* |
| 322 | * Enable ADC, buffering, select rising edge and enable ADC path |
Karl Komierowski | c9c9513 | 2011-05-08 00:55:31 +0200 | [diff] [blame] | 323 | * charging current sense if it needed, ABB 3.0 needs some special |
| 324 | * treatment too. |
Karl Komierowski | 4aad5a9 | 2011-03-05 11:46:45 +0100 | [diff] [blame] | 325 | */ |
Karl Komierowski | bd4a40b | 2011-08-10 15:09:43 +0200 | [diff] [blame] | 326 | switch (channel) { |
Karl Komierowski | 4aad5a9 | 2011-03-05 11:46:45 +0100 | [diff] [blame] | 327 | case MAIN_CHARGER_C: |
| 328 | case USB_CHARGER_C: |
| 329 | ret = abx500_mask_and_set_register_interruptible(gpadc->dev, |
| 330 | AB8500_GPADC, AB8500_GPADC_CTRL1_REG, |
| 331 | EN_BUF | EN_ICHAR, |
| 332 | EN_BUF | EN_ICHAR); |
| 333 | break; |
Karl Komierowski | c9c9513 | 2011-05-08 00:55:31 +0200 | [diff] [blame] | 334 | case BTEMP_BALL: |
| 335 | if (gpadc->chip_id >= AB8500_CUT3P0) { |
| 336 | /* Turn on btemp pull-up on ABB 3.0 */ |
| 337 | ret = abx500_mask_and_set_register_interruptible( |
| 338 | gpadc->dev, |
| 339 | AB8500_GPADC, AB8500_GPADC_CTRL1_REG, |
Johan Palsson | ed13941 | 2011-05-08 00:55:43 +0200 | [diff] [blame] | 340 | EN_BUF | BTEMP_PULL_UP, |
| 341 | EN_BUF | BTEMP_PULL_UP); |
Karl Komierowski | c9c9513 | 2011-05-08 00:55:31 +0200 | [diff] [blame] | 342 | |
| 343 | /* |
| 344 | * Delay might be needed for ABB8500 cut 3.0, if not, remove |
| 345 | * when hardware will be availible |
| 346 | */ |
| 347 | msleep(1); |
| 348 | break; |
| 349 | } |
| 350 | /* Intentional fallthrough */ |
Karl Komierowski | 4aad5a9 | 2011-03-05 11:46:45 +0100 | [diff] [blame] | 351 | default: |
| 352 | ret = abx500_mask_and_set_register_interruptible(gpadc->dev, |
| 353 | AB8500_GPADC, AB8500_GPADC_CTRL1_REG, EN_BUF, EN_BUF); |
| 354 | break; |
| 355 | } |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 356 | if (ret < 0) { |
Daniel Willerud | 6321992 | 2011-03-05 11:46:13 +0100 | [diff] [blame] | 357 | dev_err(gpadc->dev, |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 358 | "gpadc_conversion: select falling edge failed\n"); |
| 359 | goto out; |
| 360 | } |
Karl Komierowski | c9c9513 | 2011-05-08 00:55:31 +0200 | [diff] [blame] | 361 | |
Daniel Willerud | 6321992 | 2011-03-05 11:46:13 +0100 | [diff] [blame] | 362 | ret = abx500_mask_and_set_register_interruptible(gpadc->dev, |
| 363 | AB8500_GPADC, AB8500_GPADC_CTRL1_REG, ADC_SW_CONV, ADC_SW_CONV); |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 364 | if (ret < 0) { |
Daniel Willerud | 6321992 | 2011-03-05 11:46:13 +0100 | [diff] [blame] | 365 | dev_err(gpadc->dev, |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 366 | "gpadc_conversion: start s/w conversion failed\n"); |
| 367 | goto out; |
| 368 | } |
| 369 | /* wait for completion of conversion */ |
Daniel Willerud | 6321992 | 2011-03-05 11:46:13 +0100 | [diff] [blame] | 370 | if (!wait_for_completion_timeout(&gpadc->ab8500_gpadc_complete, 2*HZ)) { |
| 371 | dev_err(gpadc->dev, |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 372 | "timeout: didn't receive GPADC conversion interrupt\n"); |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 373 | ret = -EINVAL; |
| 374 | goto out; |
| 375 | } |
| 376 | |
| 377 | /* Read the converted RAW data */ |
Daniel Willerud | 6321992 | 2011-03-05 11:46:13 +0100 | [diff] [blame] | 378 | ret = abx500_get_register_interruptible(gpadc->dev, AB8500_GPADC, |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 379 | AB8500_GPADC_MANDATAL_REG, &low_data); |
| 380 | if (ret < 0) { |
Daniel Willerud | 6321992 | 2011-03-05 11:46:13 +0100 | [diff] [blame] | 381 | dev_err(gpadc->dev, "gpadc_conversion: read low data failed\n"); |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 382 | goto out; |
| 383 | } |
| 384 | |
Daniel Willerud | 6321992 | 2011-03-05 11:46:13 +0100 | [diff] [blame] | 385 | ret = abx500_get_register_interruptible(gpadc->dev, AB8500_GPADC, |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 386 | AB8500_GPADC_MANDATAH_REG, &high_data); |
| 387 | if (ret < 0) { |
Daniel Willerud | 6321992 | 2011-03-05 11:46:13 +0100 | [diff] [blame] | 388 | dev_err(gpadc->dev, |
| 389 | "gpadc_conversion: read high data failed\n"); |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 390 | goto out; |
| 391 | } |
| 392 | |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 393 | /* Disable GPADC */ |
Daniel Willerud | 6321992 | 2011-03-05 11:46:13 +0100 | [diff] [blame] | 394 | ret = abx500_set_register_interruptible(gpadc->dev, AB8500_GPADC, |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 395 | AB8500_GPADC_CTRL1_REG, DIS_GPADC); |
| 396 | if (ret < 0) { |
Daniel Willerud | 6321992 | 2011-03-05 11:46:13 +0100 | [diff] [blame] | 397 | dev_err(gpadc->dev, "gpadc_conversion: disable gpadc failed\n"); |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 398 | goto out; |
| 399 | } |
| 400 | /* Disable VTVout LDO this is required for GPADC */ |
Daniel Willerud | 6321992 | 2011-03-05 11:46:13 +0100 | [diff] [blame] | 401 | regulator_disable(gpadc->regu); |
| 402 | mutex_unlock(&gpadc->ab8500_gpadc_lock); |
Karl Komierowski | bd4a40b | 2011-08-10 15:09:43 +0200 | [diff] [blame] | 403 | |
| 404 | return (high_data << 8) | low_data; |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 405 | |
| 406 | out: |
| 407 | /* |
| 408 | * It has shown to be needed to turn off the GPADC if an error occurs, |
| 409 | * otherwise we might have problem when waiting for the busy bit in the |
| 410 | * GPADC status register to go low. In V1.1 there wait_for_completion |
| 411 | * seems to timeout when waiting for an interrupt.. Not seen in V2.0 |
| 412 | */ |
Daniel Willerud | 6321992 | 2011-03-05 11:46:13 +0100 | [diff] [blame] | 413 | (void) abx500_set_register_interruptible(gpadc->dev, AB8500_GPADC, |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 414 | AB8500_GPADC_CTRL1_REG, DIS_GPADC); |
Daniel Willerud | 6321992 | 2011-03-05 11:46:13 +0100 | [diff] [blame] | 415 | regulator_disable(gpadc->regu); |
| 416 | mutex_unlock(&gpadc->ab8500_gpadc_lock); |
| 417 | dev_err(gpadc->dev, |
Karl Komierowski | bd4a40b | 2011-08-10 15:09:43 +0200 | [diff] [blame] | 418 | "gpadc_conversion: Failed to AD convert channel %d\n", channel); |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 419 | return ret; |
| 420 | } |
Karl Komierowski | bd4a40b | 2011-08-10 15:09:43 +0200 | [diff] [blame] | 421 | EXPORT_SYMBOL(ab8500_gpadc_read_raw); |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 422 | |
| 423 | /** |
| 424 | * ab8500_bm_gpswadcconvend_handler() - isr for s/w gpadc conversion completion |
| 425 | * @irq: irq number |
| 426 | * @data: pointer to the data passed during request irq |
| 427 | * |
| 428 | * This is a interrupt service routine for s/w gpadc conversion completion. |
| 429 | * Notifies the gpadc completion is completed and the converted raw value |
| 430 | * can be read from the registers. |
| 431 | * Returns IRQ status(IRQ_HANDLED) |
| 432 | */ |
Daniel Willerud | 6321992 | 2011-03-05 11:46:13 +0100 | [diff] [blame] | 433 | static irqreturn_t ab8500_bm_gpswadcconvend_handler(int irq, void *_gpadc) |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 434 | { |
Daniel Willerud | 6321992 | 2011-03-05 11:46:13 +0100 | [diff] [blame] | 435 | struct ab8500_gpadc *gpadc = _gpadc; |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 436 | |
| 437 | complete(&gpadc->ab8500_gpadc_complete); |
| 438 | |
| 439 | return IRQ_HANDLED; |
| 440 | } |
| 441 | |
Johan Palsson | 586f331 | 2011-03-05 11:46:37 +0100 | [diff] [blame] | 442 | static int otp_cal_regs[] = { |
| 443 | AB8500_GPADC_CAL_1, |
| 444 | AB8500_GPADC_CAL_2, |
| 445 | AB8500_GPADC_CAL_3, |
| 446 | AB8500_GPADC_CAL_4, |
| 447 | AB8500_GPADC_CAL_5, |
| 448 | AB8500_GPADC_CAL_6, |
| 449 | AB8500_GPADC_CAL_7, |
| 450 | }; |
| 451 | |
| 452 | static void ab8500_gpadc_read_calibration_data(struct ab8500_gpadc *gpadc) |
| 453 | { |
| 454 | int i; |
| 455 | int ret[ARRAY_SIZE(otp_cal_regs)]; |
| 456 | u8 gpadc_cal[ARRAY_SIZE(otp_cal_regs)]; |
| 457 | |
| 458 | int vmain_high, vmain_low; |
| 459 | int btemp_high, btemp_low; |
| 460 | int vbat_high, vbat_low; |
| 461 | |
| 462 | /* First we read all OTP registers and store the error code */ |
| 463 | for (i = 0; i < ARRAY_SIZE(otp_cal_regs); i++) { |
| 464 | ret[i] = abx500_get_register_interruptible(gpadc->dev, |
| 465 | AB8500_OTP_EMUL, otp_cal_regs[i], &gpadc_cal[i]); |
| 466 | if (ret[i] < 0) |
| 467 | dev_err(gpadc->dev, "%s: read otp reg 0x%02x failed\n", |
| 468 | __func__, otp_cal_regs[i]); |
| 469 | } |
| 470 | |
| 471 | /* |
| 472 | * The ADC calibration data is stored in OTP registers. |
| 473 | * The layout of the calibration data is outlined below and a more |
| 474 | * detailed description can be found in UM0836 |
| 475 | * |
| 476 | * vm_h/l = vmain_high/low |
| 477 | * bt_h/l = btemp_high/low |
| 478 | * vb_h/l = vbat_high/low |
| 479 | * |
| 480 | * Data bits: |
| 481 | * | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| 482 | * |.......|.......|.......|.......|.......|.......|.......|....... |
| 483 | * | | vm_h9 | vm_h8 |
| 484 | * |.......|.......|.......|.......|.......|.......|.......|....... |
| 485 | * | | vm_h7 | vm_h6 | vm_h5 | vm_h4 | vm_h3 | vm_h2 |
| 486 | * |.......|.......|.......|.......|.......|.......|.......|....... |
| 487 | * | vm_h1 | vm_h0 | vm_l4 | vm_l3 | vm_l2 | vm_l1 | vm_l0 | bt_h9 |
| 488 | * |.......|.......|.......|.......|.......|.......|.......|....... |
| 489 | * | bt_h8 | bt_h7 | bt_h6 | bt_h5 | bt_h4 | bt_h3 | bt_h2 | bt_h1 |
| 490 | * |.......|.......|.......|.......|.......|.......|.......|....... |
| 491 | * | bt_h0 | bt_l4 | bt_l3 | bt_l2 | bt_l1 | bt_l0 | vb_h9 | vb_h8 |
| 492 | * |.......|.......|.......|.......|.......|.......|.......|....... |
| 493 | * | vb_h7 | vb_h6 | vb_h5 | vb_h4 | vb_h3 | vb_h2 | vb_h1 | vb_h0 |
| 494 | * |.......|.......|.......|.......|.......|.......|.......|....... |
| 495 | * | vb_l5 | vb_l4 | vb_l3 | vb_l2 | vb_l1 | vb_l0 | |
| 496 | * |.......|.......|.......|.......|.......|.......|.......|....... |
| 497 | * |
| 498 | * |
| 499 | * Ideal output ADC codes corresponding to injected input voltages |
| 500 | * during manufacturing is: |
| 501 | * |
| 502 | * vmain_high: Vin = 19500mV / ADC ideal code = 997 |
| 503 | * vmain_low: Vin = 315mV / ADC ideal code = 16 |
| 504 | * btemp_high: Vin = 1300mV / ADC ideal code = 985 |
| 505 | * btemp_low: Vin = 21mV / ADC ideal code = 16 |
| 506 | * vbat_high: Vin = 4700mV / ADC ideal code = 982 |
| 507 | * vbat_low: Vin = 2380mV / ADC ideal code = 33 |
| 508 | */ |
| 509 | |
| 510 | /* Calculate gain and offset for VMAIN if all reads succeeded */ |
| 511 | if (!(ret[0] < 0 || ret[1] < 0 || ret[2] < 0)) { |
| 512 | vmain_high = (((gpadc_cal[0] & 0x03) << 8) | |
| 513 | ((gpadc_cal[1] & 0x3F) << 2) | |
| 514 | ((gpadc_cal[2] & 0xC0) >> 6)); |
| 515 | |
| 516 | vmain_low = ((gpadc_cal[2] & 0x3E) >> 1); |
| 517 | |
| 518 | gpadc->cal_data[ADC_INPUT_VMAIN].gain = CALIB_SCALE * |
| 519 | (19500 - 315) / (vmain_high - vmain_low); |
| 520 | |
| 521 | gpadc->cal_data[ADC_INPUT_VMAIN].offset = CALIB_SCALE * 19500 - |
| 522 | (CALIB_SCALE * (19500 - 315) / |
| 523 | (vmain_high - vmain_low)) * vmain_high; |
| 524 | } else { |
| 525 | gpadc->cal_data[ADC_INPUT_VMAIN].gain = 0; |
| 526 | } |
| 527 | |
| 528 | /* Calculate gain and offset for BTEMP if all reads succeeded */ |
| 529 | if (!(ret[2] < 0 || ret[3] < 0 || ret[4] < 0)) { |
| 530 | btemp_high = (((gpadc_cal[2] & 0x01) << 9) | |
| 531 | (gpadc_cal[3] << 1) | |
| 532 | ((gpadc_cal[4] & 0x80) >> 7)); |
| 533 | |
| 534 | btemp_low = ((gpadc_cal[4] & 0x7C) >> 2); |
| 535 | |
| 536 | gpadc->cal_data[ADC_INPUT_BTEMP].gain = |
| 537 | CALIB_SCALE * (1300 - 21) / (btemp_high - btemp_low); |
| 538 | |
| 539 | gpadc->cal_data[ADC_INPUT_BTEMP].offset = CALIB_SCALE * 1300 - |
| 540 | (CALIB_SCALE * (1300 - 21) / |
| 541 | (btemp_high - btemp_low)) * btemp_high; |
| 542 | } else { |
| 543 | gpadc->cal_data[ADC_INPUT_BTEMP].gain = 0; |
| 544 | } |
| 545 | |
| 546 | /* Calculate gain and offset for VBAT if all reads succeeded */ |
| 547 | if (!(ret[4] < 0 || ret[5] < 0 || ret[6] < 0)) { |
| 548 | vbat_high = (((gpadc_cal[4] & 0x03) << 8) | gpadc_cal[5]); |
| 549 | vbat_low = ((gpadc_cal[6] & 0xFC) >> 2); |
| 550 | |
| 551 | gpadc->cal_data[ADC_INPUT_VBAT].gain = CALIB_SCALE * |
| 552 | (4700 - 2380) / (vbat_high - vbat_low); |
| 553 | |
| 554 | gpadc->cal_data[ADC_INPUT_VBAT].offset = CALIB_SCALE * 4700 - |
| 555 | (CALIB_SCALE * (4700 - 2380) / |
| 556 | (vbat_high - vbat_low)) * vbat_high; |
| 557 | } else { |
| 558 | gpadc->cal_data[ADC_INPUT_VBAT].gain = 0; |
| 559 | } |
| 560 | |
| 561 | dev_dbg(gpadc->dev, "VMAIN gain %llu offset %llu\n", |
| 562 | gpadc->cal_data[ADC_INPUT_VMAIN].gain, |
| 563 | gpadc->cal_data[ADC_INPUT_VMAIN].offset); |
| 564 | |
| 565 | dev_dbg(gpadc->dev, "BTEMP gain %llu offset %llu\n", |
| 566 | gpadc->cal_data[ADC_INPUT_BTEMP].gain, |
| 567 | gpadc->cal_data[ADC_INPUT_BTEMP].offset); |
| 568 | |
| 569 | dev_dbg(gpadc->dev, "VBAT gain %llu offset %llu\n", |
| 570 | gpadc->cal_data[ADC_INPUT_VBAT].gain, |
| 571 | gpadc->cal_data[ADC_INPUT_VBAT].offset); |
| 572 | } |
| 573 | |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 574 | static int __devinit ab8500_gpadc_probe(struct platform_device *pdev) |
| 575 | { |
| 576 | int ret = 0; |
| 577 | struct ab8500_gpadc *gpadc; |
| 578 | |
| 579 | gpadc = kzalloc(sizeof(struct ab8500_gpadc), GFP_KERNEL); |
| 580 | if (!gpadc) { |
| 581 | dev_err(&pdev->dev, "Error: No memory\n"); |
| 582 | return -ENOMEM; |
| 583 | } |
| 584 | |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 585 | gpadc->irq = platform_get_irq_byname(pdev, "SW_CONV_END"); |
| 586 | if (gpadc->irq < 0) { |
Lee Jones | 6dff11e | 2012-05-17 14:45:20 +0100 | [diff] [blame] | 587 | dev_err(&pdev->dev, "failed to get platform irq-%d\n", |
Daniel Willerud | 6321992 | 2011-03-05 11:46:13 +0100 | [diff] [blame] | 588 | gpadc->irq); |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 589 | ret = gpadc->irq; |
| 590 | goto fail; |
| 591 | } |
| 592 | |
| 593 | gpadc->dev = &pdev->dev; |
Daniel Willerud | 6321992 | 2011-03-05 11:46:13 +0100 | [diff] [blame] | 594 | mutex_init(&gpadc->ab8500_gpadc_lock); |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 595 | |
| 596 | /* Initialize completion used to notify completion of conversion */ |
| 597 | init_completion(&gpadc->ab8500_gpadc_complete); |
| 598 | |
| 599 | /* Register interrupt - SwAdcComplete */ |
| 600 | ret = request_threaded_irq(gpadc->irq, NULL, |
| 601 | ab8500_bm_gpswadcconvend_handler, |
Lee Jones | 6e19e83 | 2012-05-30 12:47:34 +0800 | [diff] [blame] | 602 | IRQF_ONESHOT | IRQF_NO_SUSPEND | IRQF_SHARED, |
| 603 | "ab8500-gpadc", gpadc); |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 604 | if (ret < 0) { |
| 605 | dev_err(gpadc->dev, "Failed to register interrupt, irq: %d\n", |
| 606 | gpadc->irq); |
| 607 | goto fail; |
| 608 | } |
| 609 | |
Karl Komierowski | c9c9513 | 2011-05-08 00:55:31 +0200 | [diff] [blame] | 610 | /* Get Chip ID of the ABB ASIC */ |
| 611 | ret = abx500_get_chip_id(gpadc->dev); |
| 612 | if (ret < 0) { |
| 613 | dev_err(gpadc->dev, "failed to get chip ID\n"); |
| 614 | goto fail_irq; |
| 615 | } |
| 616 | gpadc->chip_id = (u8) ret; |
| 617 | |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 618 | /* VTVout LDO used to power up ab8500-GPADC */ |
| 619 | gpadc->regu = regulator_get(&pdev->dev, "vddadc"); |
| 620 | if (IS_ERR(gpadc->regu)) { |
| 621 | ret = PTR_ERR(gpadc->regu); |
| 622 | dev_err(gpadc->dev, "failed to get vtvout LDO\n"); |
Daniel Willerud | 633e0fa | 2011-03-05 11:46:27 +0100 | [diff] [blame] | 623 | goto fail_irq; |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 624 | } |
Johan Palsson | 586f331 | 2011-03-05 11:46:37 +0100 | [diff] [blame] | 625 | ab8500_gpadc_read_calibration_data(gpadc); |
Daniel Willerud | 6321992 | 2011-03-05 11:46:13 +0100 | [diff] [blame] | 626 | list_add_tail(&gpadc->node, &ab8500_gpadc_list); |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 627 | dev_dbg(gpadc->dev, "probe success\n"); |
| 628 | return 0; |
Daniel Willerud | 633e0fa | 2011-03-05 11:46:27 +0100 | [diff] [blame] | 629 | fail_irq: |
| 630 | free_irq(gpadc->irq, gpadc); |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 631 | fail: |
| 632 | kfree(gpadc); |
| 633 | gpadc = NULL; |
| 634 | return ret; |
| 635 | } |
| 636 | |
| 637 | static int __devexit ab8500_gpadc_remove(struct platform_device *pdev) |
| 638 | { |
| 639 | struct ab8500_gpadc *gpadc = platform_get_drvdata(pdev); |
| 640 | |
Daniel Willerud | 6321992 | 2011-03-05 11:46:13 +0100 | [diff] [blame] | 641 | /* remove this gpadc entry from the list */ |
| 642 | list_del(&gpadc->node); |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 643 | /* remove interrupt - completion of Sw ADC conversion */ |
Daniel Willerud | 6321992 | 2011-03-05 11:46:13 +0100 | [diff] [blame] | 644 | free_irq(gpadc->irq, gpadc); |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 645 | /* disable VTVout LDO that is being used by GPADC */ |
| 646 | regulator_put(gpadc->regu); |
| 647 | kfree(gpadc); |
| 648 | gpadc = NULL; |
| 649 | return 0; |
| 650 | } |
| 651 | |
| 652 | static struct platform_driver ab8500_gpadc_driver = { |
| 653 | .probe = ab8500_gpadc_probe, |
| 654 | .remove = __devexit_p(ab8500_gpadc_remove), |
| 655 | .driver = { |
| 656 | .name = "ab8500-gpadc", |
| 657 | .owner = THIS_MODULE, |
| 658 | }, |
| 659 | }; |
| 660 | |
| 661 | static int __init ab8500_gpadc_init(void) |
| 662 | { |
| 663 | return platform_driver_register(&ab8500_gpadc_driver); |
| 664 | } |
| 665 | |
| 666 | static void __exit ab8500_gpadc_exit(void) |
| 667 | { |
| 668 | platform_driver_unregister(&ab8500_gpadc_driver); |
| 669 | } |
| 670 | |
| 671 | subsys_initcall_sync(ab8500_gpadc_init); |
| 672 | module_exit(ab8500_gpadc_exit); |
| 673 | |
| 674 | MODULE_LICENSE("GPL v2"); |
Johan Palsson | 586f331 | 2011-03-05 11:46:37 +0100 | [diff] [blame] | 675 | MODULE_AUTHOR("Arun R Murthy, Daniel Willerud, Johan Palsson"); |
Arun Murthy | dae2db3 | 2011-02-22 10:11:13 +0100 | [diff] [blame] | 676 | MODULE_ALIAS("platform:ab8500_gpadc"); |
| 677 | MODULE_DESCRIPTION("AB8500 GPADC driver"); |