blob: a70201a7472956cb59817bb7d5217418a6fa7115 [file] [log] [blame]
Arun Murthydae2db32011-02-22 10:11:13 +01001/*
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 Willerud63219922011-03-05 11:46:13 +01006 * Author: Daniel Willerud <daniel.willerud@stericsson.com>
Johan Palsson586f3312011-03-05 11:46:37 +01007 * Author: Johan Palsson <johan.palsson@stericsson.com>
Arun Murthydae2db32011-02-22 10:11:13 +01008 */
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 Willerud63219922011-03-05 11:46:13 +010020#include <linux/list.h>
Arun Murthydae2db32011-02-22 10:11:13 +010021#include <linux/mfd/ab8500.h>
22#include <linux/mfd/abx500.h>
Daniel Willerudcf169432011-03-05 11:46:01 +010023#include <linux/mfd/ab8500/ab8500-gpadc.h>
Arun Murthydae2db32011-02-22 10:11:13 +010024
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 Palsson586f3312011-03-05 11:46:37 +010040/*
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 Murthydae2db32011-02-22 10:11:13 +010052/* 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
59#define EN_BUF 0x40
60#define DIS_ZERO 0x00
61#define GPADC_BUSY 0x01
62
Johan Palsson586f3312011-03-05 11:46:37 +010063/* GPADC constants from AB8500 spec, UM0836 */
64#define ADC_RESOLUTION 1024
65#define ADC_CH_BTEMP_MIN 0
66#define ADC_CH_BTEMP_MAX 1350
67#define ADC_CH_DIETEMP_MIN 0
68#define ADC_CH_DIETEMP_MAX 1350
69#define ADC_CH_CHG_V_MIN 0
70#define ADC_CH_CHG_V_MAX 20030
71#define ADC_CH_ACCDET2_MIN 0
72#define ADC_CH_ACCDET2_MAX 2500
73#define ADC_CH_VBAT_MIN 2300
74#define ADC_CH_VBAT_MAX 4800
75#define ADC_CH_CHG_I_MIN 0
76#define ADC_CH_CHG_I_MAX 1500
77#define ADC_CH_BKBAT_MIN 0
78#define ADC_CH_BKBAT_MAX 3200
79
80/* This is used to not lose precision when dividing to get gain and offset */
81#define CALIB_SCALE 1000
82
83enum cal_channels {
84 ADC_INPUT_VMAIN = 0,
85 ADC_INPUT_BTEMP,
86 ADC_INPUT_VBAT,
87 NBR_CAL_INPUTS,
88};
89
Arun Murthydae2db32011-02-22 10:11:13 +010090/**
Johan Palsson586f3312011-03-05 11:46:37 +010091 * struct adc_cal_data - Table for storing gain and offset for the calibrated
92 * ADC channels
93 * @gain: Gain of the ADC channel
94 * @offset: Offset of the ADC channel
95 */
96struct adc_cal_data {
97 u64 gain;
98 u64 offset;
99};
100
101/**
102 * struct ab8500_gpadc - AB8500 GPADC device information
Arun Murthydae2db32011-02-22 10:11:13 +0100103 * @dev: pointer to the struct device
Daniel Willerud63219922011-03-05 11:46:13 +0100104 * @node: a list of AB8500 GPADCs, hence prepared for
105 reentrance
Arun Murthydae2db32011-02-22 10:11:13 +0100106 * @ab8500_gpadc_complete: pointer to the struct completion, to indicate
107 * the completion of gpadc conversion
108 * @ab8500_gpadc_lock: structure of type mutex
109 * @regu: pointer to the struct regulator
110 * @irq: interrupt number that is used by gpadc
Johan Palsson586f3312011-03-05 11:46:37 +0100111 * @cal_data array of ADC calibration data structs
Arun Murthydae2db32011-02-22 10:11:13 +0100112 */
Daniel Willerud63219922011-03-05 11:46:13 +0100113struct ab8500_gpadc {
Arun Murthydae2db32011-02-22 10:11:13 +0100114 struct device *dev;
Daniel Willerud63219922011-03-05 11:46:13 +0100115 struct list_head node;
Arun Murthydae2db32011-02-22 10:11:13 +0100116 struct completion ab8500_gpadc_complete;
117 struct mutex ab8500_gpadc_lock;
118 struct regulator *regu;
119 int irq;
Johan Palsson586f3312011-03-05 11:46:37 +0100120 struct adc_cal_data cal_data[NBR_CAL_INPUTS];
Daniel Willerud63219922011-03-05 11:46:13 +0100121};
122
123static LIST_HEAD(ab8500_gpadc_list);
124
125/**
126 * ab8500_gpadc_get() - returns a reference to the primary AB8500 GPADC
127 * (i.e. the first GPADC in the instance list)
128 */
129struct ab8500_gpadc *ab8500_gpadc_get(char *name)
130{
131 struct ab8500_gpadc *gpadc;
132
133 list_for_each_entry(gpadc, &ab8500_gpadc_list, node) {
134 if (!strcmp(name, dev_name(gpadc->dev)))
135 return gpadc;
136 }
137
138 return ERR_PTR(-ENOENT);
139}
140EXPORT_SYMBOL(ab8500_gpadc_get);
Arun Murthydae2db32011-02-22 10:11:13 +0100141
Johan Palsson586f3312011-03-05 11:46:37 +0100142static int ab8500_gpadc_ad_to_voltage(struct ab8500_gpadc *gpadc, u8 input,
143 int ad_value)
144{
145 int res;
146
147 switch (input) {
148 case MAIN_CHARGER_V:
149 /* For some reason we don't have calibrated data */
150 if (!gpadc->cal_data[ADC_INPUT_VMAIN].gain) {
151 res = ADC_CH_CHG_V_MIN + (ADC_CH_CHG_V_MAX -
152 ADC_CH_CHG_V_MIN) * ad_value /
153 ADC_RESOLUTION;
154 break;
155 }
156 /* Here we can use the calibrated data */
157 res = (int) (ad_value * gpadc->cal_data[ADC_INPUT_VMAIN].gain +
158 gpadc->cal_data[ADC_INPUT_VMAIN].offset) / CALIB_SCALE;
159 break;
160
161 case BAT_CTRL:
162 case BTEMP_BALL:
163 case ACC_DETECT1:
164 case ADC_AUX1:
165 case ADC_AUX2:
166 /* For some reason we don't have calibrated data */
167 if (!gpadc->cal_data[ADC_INPUT_BTEMP].gain) {
168 res = ADC_CH_BTEMP_MIN + (ADC_CH_BTEMP_MAX -
169 ADC_CH_BTEMP_MIN) * ad_value /
170 ADC_RESOLUTION;
171 break;
172 }
173 /* Here we can use the calibrated data */
174 res = (int) (ad_value * gpadc->cal_data[ADC_INPUT_BTEMP].gain +
175 gpadc->cal_data[ADC_INPUT_BTEMP].offset) / CALIB_SCALE;
176 break;
177
178 case MAIN_BAT_V:
179 /* For some reason we don't have calibrated data */
180 if (!gpadc->cal_data[ADC_INPUT_VBAT].gain) {
181 res = ADC_CH_VBAT_MIN + (ADC_CH_VBAT_MAX -
182 ADC_CH_VBAT_MIN) * ad_value /
183 ADC_RESOLUTION;
184 break;
185 }
186 /* Here we can use the calibrated data */
187 res = (int) (ad_value * gpadc->cal_data[ADC_INPUT_VBAT].gain +
188 gpadc->cal_data[ADC_INPUT_VBAT].offset) / CALIB_SCALE;
189 break;
190
191 case DIE_TEMP:
192 res = ADC_CH_DIETEMP_MIN +
193 (ADC_CH_DIETEMP_MAX - ADC_CH_DIETEMP_MIN) * ad_value /
194 ADC_RESOLUTION;
195 break;
196
197 case ACC_DETECT2:
198 res = ADC_CH_ACCDET2_MIN +
199 (ADC_CH_ACCDET2_MAX - ADC_CH_ACCDET2_MIN) * ad_value /
200 ADC_RESOLUTION;
201 break;
202
203 case VBUS_V:
204 res = ADC_CH_CHG_V_MIN +
205 (ADC_CH_CHG_V_MAX - ADC_CH_CHG_V_MIN) * ad_value /
206 ADC_RESOLUTION;
207 break;
208
209 case MAIN_CHARGER_C:
210 case USB_CHARGER_C:
211 res = ADC_CH_CHG_I_MIN +
212 (ADC_CH_CHG_I_MAX - ADC_CH_CHG_I_MIN) * ad_value /
213 ADC_RESOLUTION;
214 break;
215
216 case BK_BAT_V:
217 res = ADC_CH_BKBAT_MIN +
218 (ADC_CH_BKBAT_MAX - ADC_CH_BKBAT_MIN) * ad_value /
219 ADC_RESOLUTION;
220 break;
221
222 default:
223 dev_err(gpadc->dev,
224 "unknown channel, not possible to convert\n");
225 res = -EINVAL;
226 break;
227
228 }
229 return res;
230}
231
Arun Murthydae2db32011-02-22 10:11:13 +0100232/**
233 * ab8500_gpadc_convert() - gpadc conversion
234 * @input: analog input to be converted to digital data
235 *
236 * This function converts the selected analog i/p to digital
Johan Palsson586f3312011-03-05 11:46:37 +0100237 * data.
Arun Murthydae2db32011-02-22 10:11:13 +0100238 */
Daniel Willerud63219922011-03-05 11:46:13 +0100239int ab8500_gpadc_convert(struct ab8500_gpadc *gpadc, u8 input)
Arun Murthydae2db32011-02-22 10:11:13 +0100240{
241 int ret;
242 u16 data = 0;
243 int looplimit = 0;
244 u8 val, low_data, high_data;
245
Daniel Willerud63219922011-03-05 11:46:13 +0100246 if (!gpadc)
Arun Murthydae2db32011-02-22 10:11:13 +0100247 return -ENODEV;
248
Daniel Willerud63219922011-03-05 11:46:13 +0100249 mutex_lock(&gpadc->ab8500_gpadc_lock);
Arun Murthydae2db32011-02-22 10:11:13 +0100250 /* Enable VTVout LDO this is required for GPADC */
Daniel Willerud63219922011-03-05 11:46:13 +0100251 regulator_enable(gpadc->regu);
Arun Murthydae2db32011-02-22 10:11:13 +0100252
253 /* Check if ADC is not busy, lock and proceed */
254 do {
Daniel Willerud63219922011-03-05 11:46:13 +0100255 ret = abx500_get_register_interruptible(gpadc->dev,
256 AB8500_GPADC, AB8500_GPADC_STAT_REG, &val);
Arun Murthydae2db32011-02-22 10:11:13 +0100257 if (ret < 0)
258 goto out;
259 if (!(val & GPADC_BUSY))
260 break;
261 msleep(10);
262 } while (++looplimit < 10);
263 if (looplimit >= 10 && (val & GPADC_BUSY)) {
Daniel Willerud63219922011-03-05 11:46:13 +0100264 dev_err(gpadc->dev, "gpadc_conversion: GPADC busy");
Arun Murthydae2db32011-02-22 10:11:13 +0100265 ret = -EINVAL;
266 goto out;
267 }
268
269 /* Enable GPADC */
Daniel Willerud63219922011-03-05 11:46:13 +0100270 ret = abx500_mask_and_set_register_interruptible(gpadc->dev,
271 AB8500_GPADC, AB8500_GPADC_CTRL1_REG, EN_GPADC, EN_GPADC);
Arun Murthydae2db32011-02-22 10:11:13 +0100272 if (ret < 0) {
Daniel Willerud63219922011-03-05 11:46:13 +0100273 dev_err(gpadc->dev, "gpadc_conversion: enable gpadc failed\n");
Arun Murthydae2db32011-02-22 10:11:13 +0100274 goto out;
275 }
276 /* Select the input source and set average samples to 16 */
Daniel Willerud63219922011-03-05 11:46:13 +0100277 ret = abx500_set_register_interruptible(gpadc->dev, AB8500_GPADC,
Arun Murthydae2db32011-02-22 10:11:13 +0100278 AB8500_GPADC_CTRL2_REG, (input | SW_AVG_16));
279 if (ret < 0) {
Daniel Willerud63219922011-03-05 11:46:13 +0100280 dev_err(gpadc->dev,
Arun Murthydae2db32011-02-22 10:11:13 +0100281 "gpadc_conversion: set avg samples failed\n");
282 goto out;
283 }
284 /* Enable ADC, Buffering and select rising edge, start Conversion */
Daniel Willerud63219922011-03-05 11:46:13 +0100285 ret = abx500_mask_and_set_register_interruptible(gpadc->dev,
286 AB8500_GPADC, AB8500_GPADC_CTRL1_REG, EN_BUF, EN_BUF);
Arun Murthydae2db32011-02-22 10:11:13 +0100287 if (ret < 0) {
Daniel Willerud63219922011-03-05 11:46:13 +0100288 dev_err(gpadc->dev,
Arun Murthydae2db32011-02-22 10:11:13 +0100289 "gpadc_conversion: select falling edge failed\n");
290 goto out;
291 }
Daniel Willerud63219922011-03-05 11:46:13 +0100292 ret = abx500_mask_and_set_register_interruptible(gpadc->dev,
293 AB8500_GPADC, AB8500_GPADC_CTRL1_REG, ADC_SW_CONV, ADC_SW_CONV);
Arun Murthydae2db32011-02-22 10:11:13 +0100294 if (ret < 0) {
Daniel Willerud63219922011-03-05 11:46:13 +0100295 dev_err(gpadc->dev,
Arun Murthydae2db32011-02-22 10:11:13 +0100296 "gpadc_conversion: start s/w conversion failed\n");
297 goto out;
298 }
299 /* wait for completion of conversion */
Daniel Willerud63219922011-03-05 11:46:13 +0100300 if (!wait_for_completion_timeout(&gpadc->ab8500_gpadc_complete, 2*HZ)) {
301 dev_err(gpadc->dev,
Arun Murthydae2db32011-02-22 10:11:13 +0100302 "timeout: didnt recieve GPADC conversion interrupt\n");
303 ret = -EINVAL;
304 goto out;
305 }
306
307 /* Read the converted RAW data */
Daniel Willerud63219922011-03-05 11:46:13 +0100308 ret = abx500_get_register_interruptible(gpadc->dev, AB8500_GPADC,
Arun Murthydae2db32011-02-22 10:11:13 +0100309 AB8500_GPADC_MANDATAL_REG, &low_data);
310 if (ret < 0) {
Daniel Willerud63219922011-03-05 11:46:13 +0100311 dev_err(gpadc->dev, "gpadc_conversion: read low data failed\n");
Arun Murthydae2db32011-02-22 10:11:13 +0100312 goto out;
313 }
314
Daniel Willerud63219922011-03-05 11:46:13 +0100315 ret = abx500_get_register_interruptible(gpadc->dev, AB8500_GPADC,
Arun Murthydae2db32011-02-22 10:11:13 +0100316 AB8500_GPADC_MANDATAH_REG, &high_data);
317 if (ret < 0) {
Daniel Willerud63219922011-03-05 11:46:13 +0100318 dev_err(gpadc->dev,
319 "gpadc_conversion: read high data failed\n");
Arun Murthydae2db32011-02-22 10:11:13 +0100320 goto out;
321 }
322
323 data = (high_data << 8) | low_data;
324 /* Disable GPADC */
Daniel Willerud63219922011-03-05 11:46:13 +0100325 ret = abx500_set_register_interruptible(gpadc->dev, AB8500_GPADC,
Arun Murthydae2db32011-02-22 10:11:13 +0100326 AB8500_GPADC_CTRL1_REG, DIS_GPADC);
327 if (ret < 0) {
Daniel Willerud63219922011-03-05 11:46:13 +0100328 dev_err(gpadc->dev, "gpadc_conversion: disable gpadc failed\n");
Arun Murthydae2db32011-02-22 10:11:13 +0100329 goto out;
330 }
331 /* Disable VTVout LDO this is required for GPADC */
Daniel Willerud63219922011-03-05 11:46:13 +0100332 regulator_disable(gpadc->regu);
333 mutex_unlock(&gpadc->ab8500_gpadc_lock);
Johan Palsson586f3312011-03-05 11:46:37 +0100334 ret = ab8500_gpadc_ad_to_voltage(gpadc, input, data);
335 return ret;
Arun Murthydae2db32011-02-22 10:11:13 +0100336
337out:
338 /*
339 * It has shown to be needed to turn off the GPADC if an error occurs,
340 * otherwise we might have problem when waiting for the busy bit in the
341 * GPADC status register to go low. In V1.1 there wait_for_completion
342 * seems to timeout when waiting for an interrupt.. Not seen in V2.0
343 */
Daniel Willerud63219922011-03-05 11:46:13 +0100344 (void) abx500_set_register_interruptible(gpadc->dev, AB8500_GPADC,
Arun Murthydae2db32011-02-22 10:11:13 +0100345 AB8500_GPADC_CTRL1_REG, DIS_GPADC);
Daniel Willerud63219922011-03-05 11:46:13 +0100346 regulator_disable(gpadc->regu);
347 mutex_unlock(&gpadc->ab8500_gpadc_lock);
348 dev_err(gpadc->dev,
349 "gpadc_conversion: Failed to AD convert channel %d\n", input);
Arun Murthydae2db32011-02-22 10:11:13 +0100350 return ret;
351}
352EXPORT_SYMBOL(ab8500_gpadc_convert);
353
354/**
355 * ab8500_bm_gpswadcconvend_handler() - isr for s/w gpadc conversion completion
356 * @irq: irq number
357 * @data: pointer to the data passed during request irq
358 *
359 * This is a interrupt service routine for s/w gpadc conversion completion.
360 * Notifies the gpadc completion is completed and the converted raw value
361 * can be read from the registers.
362 * Returns IRQ status(IRQ_HANDLED)
363 */
Daniel Willerud63219922011-03-05 11:46:13 +0100364static irqreturn_t ab8500_bm_gpswadcconvend_handler(int irq, void *_gpadc)
Arun Murthydae2db32011-02-22 10:11:13 +0100365{
Daniel Willerud63219922011-03-05 11:46:13 +0100366 struct ab8500_gpadc *gpadc = _gpadc;
Arun Murthydae2db32011-02-22 10:11:13 +0100367
368 complete(&gpadc->ab8500_gpadc_complete);
369
370 return IRQ_HANDLED;
371}
372
Johan Palsson586f3312011-03-05 11:46:37 +0100373static int otp_cal_regs[] = {
374 AB8500_GPADC_CAL_1,
375 AB8500_GPADC_CAL_2,
376 AB8500_GPADC_CAL_3,
377 AB8500_GPADC_CAL_4,
378 AB8500_GPADC_CAL_5,
379 AB8500_GPADC_CAL_6,
380 AB8500_GPADC_CAL_7,
381};
382
383static void ab8500_gpadc_read_calibration_data(struct ab8500_gpadc *gpadc)
384{
385 int i;
386 int ret[ARRAY_SIZE(otp_cal_regs)];
387 u8 gpadc_cal[ARRAY_SIZE(otp_cal_regs)];
388
389 int vmain_high, vmain_low;
390 int btemp_high, btemp_low;
391 int vbat_high, vbat_low;
392
393 /* First we read all OTP registers and store the error code */
394 for (i = 0; i < ARRAY_SIZE(otp_cal_regs); i++) {
395 ret[i] = abx500_get_register_interruptible(gpadc->dev,
396 AB8500_OTP_EMUL, otp_cal_regs[i], &gpadc_cal[i]);
397 if (ret[i] < 0)
398 dev_err(gpadc->dev, "%s: read otp reg 0x%02x failed\n",
399 __func__, otp_cal_regs[i]);
400 }
401
402 /*
403 * The ADC calibration data is stored in OTP registers.
404 * The layout of the calibration data is outlined below and a more
405 * detailed description can be found in UM0836
406 *
407 * vm_h/l = vmain_high/low
408 * bt_h/l = btemp_high/low
409 * vb_h/l = vbat_high/low
410 *
411 * Data bits:
412 * | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0
413 * |.......|.......|.......|.......|.......|.......|.......|.......
414 * | | vm_h9 | vm_h8
415 * |.......|.......|.......|.......|.......|.......|.......|.......
416 * | | vm_h7 | vm_h6 | vm_h5 | vm_h4 | vm_h3 | vm_h2
417 * |.......|.......|.......|.......|.......|.......|.......|.......
418 * | vm_h1 | vm_h0 | vm_l4 | vm_l3 | vm_l2 | vm_l1 | vm_l0 | bt_h9
419 * |.......|.......|.......|.......|.......|.......|.......|.......
420 * | bt_h8 | bt_h7 | bt_h6 | bt_h5 | bt_h4 | bt_h3 | bt_h2 | bt_h1
421 * |.......|.......|.......|.......|.......|.......|.......|.......
422 * | bt_h0 | bt_l4 | bt_l3 | bt_l2 | bt_l1 | bt_l0 | vb_h9 | vb_h8
423 * |.......|.......|.......|.......|.......|.......|.......|.......
424 * | vb_h7 | vb_h6 | vb_h5 | vb_h4 | vb_h3 | vb_h2 | vb_h1 | vb_h0
425 * |.......|.......|.......|.......|.......|.......|.......|.......
426 * | vb_l5 | vb_l4 | vb_l3 | vb_l2 | vb_l1 | vb_l0 |
427 * |.......|.......|.......|.......|.......|.......|.......|.......
428 *
429 *
430 * Ideal output ADC codes corresponding to injected input voltages
431 * during manufacturing is:
432 *
433 * vmain_high: Vin = 19500mV / ADC ideal code = 997
434 * vmain_low: Vin = 315mV / ADC ideal code = 16
435 * btemp_high: Vin = 1300mV / ADC ideal code = 985
436 * btemp_low: Vin = 21mV / ADC ideal code = 16
437 * vbat_high: Vin = 4700mV / ADC ideal code = 982
438 * vbat_low: Vin = 2380mV / ADC ideal code = 33
439 */
440
441 /* Calculate gain and offset for VMAIN if all reads succeeded */
442 if (!(ret[0] < 0 || ret[1] < 0 || ret[2] < 0)) {
443 vmain_high = (((gpadc_cal[0] & 0x03) << 8) |
444 ((gpadc_cal[1] & 0x3F) << 2) |
445 ((gpadc_cal[2] & 0xC0) >> 6));
446
447 vmain_low = ((gpadc_cal[2] & 0x3E) >> 1);
448
449 gpadc->cal_data[ADC_INPUT_VMAIN].gain = CALIB_SCALE *
450 (19500 - 315) / (vmain_high - vmain_low);
451
452 gpadc->cal_data[ADC_INPUT_VMAIN].offset = CALIB_SCALE * 19500 -
453 (CALIB_SCALE * (19500 - 315) /
454 (vmain_high - vmain_low)) * vmain_high;
455 } else {
456 gpadc->cal_data[ADC_INPUT_VMAIN].gain = 0;
457 }
458
459 /* Calculate gain and offset for BTEMP if all reads succeeded */
460 if (!(ret[2] < 0 || ret[3] < 0 || ret[4] < 0)) {
461 btemp_high = (((gpadc_cal[2] & 0x01) << 9) |
462 (gpadc_cal[3] << 1) |
463 ((gpadc_cal[4] & 0x80) >> 7));
464
465 btemp_low = ((gpadc_cal[4] & 0x7C) >> 2);
466
467 gpadc->cal_data[ADC_INPUT_BTEMP].gain =
468 CALIB_SCALE * (1300 - 21) / (btemp_high - btemp_low);
469
470 gpadc->cal_data[ADC_INPUT_BTEMP].offset = CALIB_SCALE * 1300 -
471 (CALIB_SCALE * (1300 - 21) /
472 (btemp_high - btemp_low)) * btemp_high;
473 } else {
474 gpadc->cal_data[ADC_INPUT_BTEMP].gain = 0;
475 }
476
477 /* Calculate gain and offset for VBAT if all reads succeeded */
478 if (!(ret[4] < 0 || ret[5] < 0 || ret[6] < 0)) {
479 vbat_high = (((gpadc_cal[4] & 0x03) << 8) | gpadc_cal[5]);
480 vbat_low = ((gpadc_cal[6] & 0xFC) >> 2);
481
482 gpadc->cal_data[ADC_INPUT_VBAT].gain = CALIB_SCALE *
483 (4700 - 2380) / (vbat_high - vbat_low);
484
485 gpadc->cal_data[ADC_INPUT_VBAT].offset = CALIB_SCALE * 4700 -
486 (CALIB_SCALE * (4700 - 2380) /
487 (vbat_high - vbat_low)) * vbat_high;
488 } else {
489 gpadc->cal_data[ADC_INPUT_VBAT].gain = 0;
490 }
491
492 dev_dbg(gpadc->dev, "VMAIN gain %llu offset %llu\n",
493 gpadc->cal_data[ADC_INPUT_VMAIN].gain,
494 gpadc->cal_data[ADC_INPUT_VMAIN].offset);
495
496 dev_dbg(gpadc->dev, "BTEMP gain %llu offset %llu\n",
497 gpadc->cal_data[ADC_INPUT_BTEMP].gain,
498 gpadc->cal_data[ADC_INPUT_BTEMP].offset);
499
500 dev_dbg(gpadc->dev, "VBAT gain %llu offset %llu\n",
501 gpadc->cal_data[ADC_INPUT_VBAT].gain,
502 gpadc->cal_data[ADC_INPUT_VBAT].offset);
503}
504
Arun Murthydae2db32011-02-22 10:11:13 +0100505static int __devinit ab8500_gpadc_probe(struct platform_device *pdev)
506{
507 int ret = 0;
508 struct ab8500_gpadc *gpadc;
509
510 gpadc = kzalloc(sizeof(struct ab8500_gpadc), GFP_KERNEL);
511 if (!gpadc) {
512 dev_err(&pdev->dev, "Error: No memory\n");
513 return -ENOMEM;
514 }
515
Arun Murthydae2db32011-02-22 10:11:13 +0100516 gpadc->irq = platform_get_irq_byname(pdev, "SW_CONV_END");
517 if (gpadc->irq < 0) {
Daniel Willerud63219922011-03-05 11:46:13 +0100518 dev_err(gpadc->dev, "failed to get platform irq-%d\n",
519 gpadc->irq);
Arun Murthydae2db32011-02-22 10:11:13 +0100520 ret = gpadc->irq;
521 goto fail;
522 }
523
524 gpadc->dev = &pdev->dev;
Daniel Willerud63219922011-03-05 11:46:13 +0100525 mutex_init(&gpadc->ab8500_gpadc_lock);
Arun Murthydae2db32011-02-22 10:11:13 +0100526
527 /* Initialize completion used to notify completion of conversion */
528 init_completion(&gpadc->ab8500_gpadc_complete);
529
530 /* Register interrupt - SwAdcComplete */
531 ret = request_threaded_irq(gpadc->irq, NULL,
532 ab8500_bm_gpswadcconvend_handler,
533 IRQF_NO_SUSPEND | IRQF_SHARED, "ab8500-gpadc", gpadc);
534 if (ret < 0) {
535 dev_err(gpadc->dev, "Failed to register interrupt, irq: %d\n",
536 gpadc->irq);
537 goto fail;
538 }
539
540 /* VTVout LDO used to power up ab8500-GPADC */
541 gpadc->regu = regulator_get(&pdev->dev, "vddadc");
542 if (IS_ERR(gpadc->regu)) {
543 ret = PTR_ERR(gpadc->regu);
544 dev_err(gpadc->dev, "failed to get vtvout LDO\n");
Daniel Willerud633e0fa2011-03-05 11:46:27 +0100545 goto fail_irq;
Arun Murthydae2db32011-02-22 10:11:13 +0100546 }
Johan Palsson586f3312011-03-05 11:46:37 +0100547 ab8500_gpadc_read_calibration_data(gpadc);
Daniel Willerud63219922011-03-05 11:46:13 +0100548 list_add_tail(&gpadc->node, &ab8500_gpadc_list);
Arun Murthydae2db32011-02-22 10:11:13 +0100549 dev_dbg(gpadc->dev, "probe success\n");
550 return 0;
Daniel Willerud633e0fa2011-03-05 11:46:27 +0100551fail_irq:
552 free_irq(gpadc->irq, gpadc);
Arun Murthydae2db32011-02-22 10:11:13 +0100553fail:
554 kfree(gpadc);
555 gpadc = NULL;
556 return ret;
557}
558
559static int __devexit ab8500_gpadc_remove(struct platform_device *pdev)
560{
561 struct ab8500_gpadc *gpadc = platform_get_drvdata(pdev);
562
Daniel Willerud63219922011-03-05 11:46:13 +0100563 /* remove this gpadc entry from the list */
564 list_del(&gpadc->node);
Arun Murthydae2db32011-02-22 10:11:13 +0100565 /* remove interrupt - completion of Sw ADC conversion */
Daniel Willerud63219922011-03-05 11:46:13 +0100566 free_irq(gpadc->irq, gpadc);
Arun Murthydae2db32011-02-22 10:11:13 +0100567 /* disable VTVout LDO that is being used by GPADC */
568 regulator_put(gpadc->regu);
569 kfree(gpadc);
570 gpadc = NULL;
571 return 0;
572}
573
574static struct platform_driver ab8500_gpadc_driver = {
575 .probe = ab8500_gpadc_probe,
576 .remove = __devexit_p(ab8500_gpadc_remove),
577 .driver = {
578 .name = "ab8500-gpadc",
579 .owner = THIS_MODULE,
580 },
581};
582
583static int __init ab8500_gpadc_init(void)
584{
585 return platform_driver_register(&ab8500_gpadc_driver);
586}
587
588static void __exit ab8500_gpadc_exit(void)
589{
590 platform_driver_unregister(&ab8500_gpadc_driver);
591}
592
593subsys_initcall_sync(ab8500_gpadc_init);
594module_exit(ab8500_gpadc_exit);
595
596MODULE_LICENSE("GPL v2");
Johan Palsson586f3312011-03-05 11:46:37 +0100597MODULE_AUTHOR("Arun R Murthy, Daniel Willerud, Johan Palsson");
Arun Murthydae2db32011-02-22 10:11:13 +0100598MODULE_ALIAS("platform:ab8500_gpadc");
599MODULE_DESCRIPTION("AB8500 GPADC driver");