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path: root/target/linux/omap24xx/patches-3.3/900-n810-battery-management.patch
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-rw-r--r--target/linux/omap24xx/patches-3.3/900-n810-battery-management.patch1917
1 files changed, 1917 insertions, 0 deletions
diff --git a/target/linux/omap24xx/patches-3.3/900-n810-battery-management.patch b/target/linux/omap24xx/patches-3.3/900-n810-battery-management.patch
new file mode 100644
index 0000000000..bdec65f777
--- /dev/null
+++ b/target/linux/omap24xx/patches-3.3/900-n810-battery-management.patch
@@ -0,0 +1,1917 @@
+--- a/drivers/cbus/Kconfig
++++ b/drivers/cbus/Kconfig
+@@ -83,4 +83,12 @@ config CBUS_RETU_HEADSET
+
+ endif # CBUS_RETU
+
++config N810BM
++ depends on CBUS_RETU && CBUS_TAHVO
++ tristate "Nokia n810 battery management"
++ ---help---
++ Nokia n810 device battery management.
++
++ If unsure, say N.
++
+ endmenu
+--- a/drivers/cbus/Makefile
++++ b/drivers/cbus/Makefile
+@@ -11,3 +11,6 @@ obj-$(CONFIG_CBUS_RETU_POWERBUTTON) += r
+ obj-$(CONFIG_CBUS_RETU_RTC) += retu-rtc.o
+ obj-$(CONFIG_CBUS_RETU_WDT) += retu-wdt.o
+ obj-$(CONFIG_CBUS_RETU_HEADSET) += retu-headset.o
++n810bm-y += n810bm_main.o
++n810bm-y += lipocharge.o
++obj-$(CONFIG_N810BM) += n810bm.o
+--- /dev/null
++++ b/drivers/cbus/n810bm_main.c
+@@ -0,0 +1,1572 @@
++/*
++ * Nokia n810 battery management
++ *
++ * WARNING: This driver is based on unconfirmed documentation.
++ * It is possibly dangerous to use this software.
++ * Use this software at your own risk!
++ *
++ * Copyright (c) 2010-2011 Michael Buesch <mb@bu3sch.de>
++ *
++ * This program is free software; you can redistribute it and/or
++ * modify it under the terms of the GNU General Public License
++ * as published by the Free Software Foundation; either version 2
++ * of the License, or (at your option) any later version.
++ *
++ * This program is distributed in the hope that it will be useful,
++ * but WITHOUT ANY WARRANTY; without even the implied warranty of
++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
++ * GNU General Public License for more details.
++ */
++
++#define DEBUG
++
++#include <linux/module.h>
++#include <linux/device.h>
++#include <linux/platform_device.h>
++#include <linux/slab.h>
++#include <linux/mutex.h>
++#include <linux/timer.h>
++#include <linux/firmware.h>
++#include <linux/bitops.h>
++#include <linux/workqueue.h>
++#include <linux/delay.h>
++#include <linux/interrupt.h>
++
++#include "cbus.h"
++#include "retu.h"
++#include "tahvo.h"
++#include "lipocharge.h"
++
++
++#define N810BM_PMM_BLOCK_FILENAME "n810-cal-bme-pmm.fw"
++#define N810BM_PMM_BLOCK_SIZE 0x600
++#define N810BM_PMM_GROUP_SIZE 0x200
++#define N810BM_PMM_ELEM_SIZE 0x10
++
++#define N810BM_CHECK_INTERVAL (HZ * 2)
++#define N810BM_MIN_VOLTAGE_THRES 3200 /* Absolute minimum voltage threshold */
++
++
++/* RETU_ADC_BSI
++ * The battery size indicator ADC measures the resistance between
++ * the battery BSI pin and ground. This is used to detect the battery
++ * capacity, as the BSI resistor is related to capacity.
++ *
++ * Manually measured lookup table.
++ * Hard to measure, thus not very accurate.
++ *
++ * Resistance | ADC value
++ * ========================
++ * 120k | 0x3AC
++ * 110k | 0x37C
++ * 100k | 0x351
++ * 90k | 0x329
++ */
++
++/* RETU_ADC_BATTVOLT
++ * Manually measured lookup table.
++ * Hard to measure, thus not very accurate.
++ *
++ * Voltage | ADC value
++ * =====================
++ * 2.80V | 0x037
++ * 2.90V | 0x05E
++ * 3.00V | 0x090
++ * 3.10V | 0x0A4
++ * 3.20V | 0x0CC
++ * 3.30V | 0x0EF
++ * 3.40V | 0x115
++ * 3.50V | 0x136
++ * 3.60V | 0x15C
++ * 3.70V | 0x187
++ * 3.80V | 0x1A5
++ * 3.90V | 0x1C9
++ * 4.00V | 0x1ED
++ * 4.10V | 0x212
++ * 4.20V | 0x236
++ */
++
++
++/* PMM block ADC IDs */
++enum n810bm_pmm_adc_id {
++ N810BM_PMM_ADC_BATVOLT = 0x01, /* Battery voltage */
++ N810BM_PMM_ADC_CHGVOLT = 0x02, /* Charger voltage */
++ N810BM_PMM_ADC_GND2 = 0x03, /* Ground 0V */
++ N810BM_PMM_ADC_BSI = 0x04, /* Battery size indicator */
++ N810BM_PMM_ADC_BATTEMP = 0x05, /* Battery temperature */
++ N810BM_PMM_ADC_HEADSET = 0x06, /* Headset detection */
++ N810BM_PMM_ADC_HOOKDET = 0x07, /* Hook detection */
++ N810BM_PMM_ADC_LIGHTSENS = 0x08, /* Light sensor */
++ N810BM_PMM_ADC_BATCURR = 0x0E, /* Battery current */
++ N810BM_PMM_ADC_BKUPVOLT = 0x13, /* Backup battery voltage */
++ N810BM_PMM_ADC_LIGHTTEMP = 0x14, /* Light sensor temperature */
++ N810BM_PMM_ADC_RFGP = 0x15, /* RF GP */
++ N810BM_PMM_ADC_WBTX = 0x16, /* Wideband TX detection */
++ N810BM_PMM_ADC_RETUTEMP = 0x17, /* RETU chip temperature */
++ N810BM_PMM_ADC_0xFE = 0xFE,
++};
++
++struct n810bm_adc_calib {
++ enum n810bm_pmm_adc_id id;
++ u8 flags;
++ u8 adc_groupnr;
++ u32 field1;
++ u32 field2;
++ u16 field3;
++ u16 field4;
++};
++
++struct n810bm_calib {
++ struct n810bm_adc_calib adc[25];
++};
++
++enum n810bm_capacity {
++ N810BM_CAP_UNKNOWN = -1,
++ N810BM_CAP_NONE = 0,
++ N810BM_CAP_1500MAH = 1500, /* 1500 mAh battery */
++};
++
++enum n810bm_notify_flags {
++ N810BM_NOTIFY_charger_present,
++ N810BM_NOTIFY_charger_state,
++ N810BM_NOTIFY_charger_pwm,
++};
++
++struct n810bm {
++ int tahvo_irq;
++ bool tahvo_irq_enabled;
++
++ bool battery_present; /* A battery is inserted */
++ bool charger_present; /* The charger is connected */
++ enum n810bm_capacity capacity; /* The capacity of the inserted battery (if any) */
++
++ bool charger_enabled; /* Want to charge? */
++ struct lipocharge charger; /* Charger subsystem */
++ unsigned int active_current_pwm; /* Active value of TAHVO_REG_CHGCURR */
++ int current_measure_enabled; /* Current measure enable refcount */
++
++ struct platform_device *pdev;
++ struct n810bm_calib calib; /* Calibration data */
++
++ bool verbose_charge_log; /* Verbose charge logging */
++
++ unsigned long notify_flags;
++ struct work_struct notify_work;
++ struct delayed_work periodic_check_work;
++
++ bool initialized; /* The hardware was initialized */
++ struct mutex mutex;
++};
++
++static void n810bm_notify_charger_present(struct n810bm *bm);
++static void n810bm_notify_charger_state(struct n810bm *bm);
++static void n810bm_notify_charger_pwm(struct n810bm *bm);
++
++
++static struct platform_device *n810bm_retu_device;
++static struct platform_device *n810bm_tahvo_device;
++
++
++static inline struct n810bm * device_to_n810bm(struct device *dev)
++{
++ struct platform_device *pdev = to_platform_device(dev);
++ struct n810bm *bm = platform_get_drvdata(pdev);
++
++ return bm;
++}
++
++static inline bool n810bm_known_battery_present(struct n810bm *bm)
++{
++ return bm->battery_present &&
++ bm->capacity != N810BM_CAP_UNKNOWN &&
++ bm->capacity != N810BM_CAP_NONE;
++}
++
++static void n810bm_emergency(struct n810bm *bm, const char *message) __noreturn;
++static void n810bm_emergency(struct n810bm *bm, const char *message)
++{
++ printk(KERN_EMERG "n810 battery management fatal fault: %s\n", message);
++ cbus_emergency();
++}
++
++static u16 tahvo_read(struct n810bm *bm, unsigned int reg)
++{
++ return tahvo_read_reg(&n810bm_tahvo_device->dev, reg);
++}
++
++static void tahvo_maskset(struct n810bm *bm, unsigned int reg, u16 mask, u16 set)
++{
++ tahvo_set_clear_reg_bits(&n810bm_tahvo_device->dev, reg, set, mask);
++}
++
++static inline void tahvo_write(struct n810bm *bm, unsigned int reg, u16 value)
++{
++ tahvo_write_reg(&n810bm_tahvo_device->dev, reg, value);
++}
++
++static inline void tahvo_set(struct n810bm *bm, unsigned int reg, u16 mask)
++{
++ tahvo_set_clear_reg_bits(&n810bm_tahvo_device->dev, reg, mask, mask);
++}
++
++static inline void tahvo_clear(struct n810bm *bm, unsigned int reg, u16 mask)
++{
++ tahvo_set_clear_reg_bits(&n810bm_tahvo_device->dev, reg, 0, mask);
++}
++
++static u16 retu_read(struct n810bm *bm, unsigned int reg)
++{
++ return retu_read_reg(&n810bm_retu_device->dev, reg);
++}
++
++static void retu_maskset(struct n810bm *bm, unsigned int reg, u16 mask, u16 set)
++{
++ retu_set_clear_reg_bits(&n810bm_retu_device->dev, reg, set, mask);
++}
++
++static inline void retu_write(struct n810bm *bm, unsigned int reg, u16 value)
++{
++ retu_write_reg(&n810bm_retu_device->dev, reg, value);
++}
++
++static int retu_adc_average(struct n810bm *bm, unsigned int chan,
++ unsigned int nr_passes)
++{
++ unsigned int i, value = 0;
++ int ret;
++
++ if (WARN_ON(!nr_passes))
++ return 0;
++ for (i = 0; i < nr_passes; i++) {
++ ret = retu_read_adc(&n810bm_retu_device->dev, chan);
++ if (ret < 0)
++ return ret;
++ value += ret;
++ }
++ value /= nr_passes;
++
++ return value;
++}
++
++static struct n810bm_adc_calib * n810bm_get_adc_calib(struct n810bm *bm,
++ enum n810bm_pmm_adc_id id)
++{
++ unsigned int index = 0;
++ struct n810bm_adc_calib *cal;
++
++ if (id != N810BM_PMM_ADC_0xFE)
++ index = (unsigned int)id + 1;
++ if (index >= ARRAY_SIZE(bm->calib.adc))
++ return NULL;
++
++ cal = &bm->calib.adc[index];
++ WARN_ON(cal->id && cal->id != id);
++
++ return cal;
++}
++
++static int pmm_record_get(struct n810bm *bm,
++ const struct firmware *pmm_block,
++ void *buffer, size_t length,
++ unsigned int group, unsigned int element, unsigned int offset)
++{
++ const u8 *pmm_area = pmm_block->data;
++ u8 active_group_mask;
++
++ if (pmm_block->size != N810BM_PMM_BLOCK_SIZE)
++ return -EINVAL;
++ if (group >= N810BM_PMM_BLOCK_SIZE / N810BM_PMM_GROUP_SIZE)
++ return -EINVAL;
++ if (element >= N810BM_PMM_GROUP_SIZE / N810BM_PMM_ELEM_SIZE)
++ return -EINVAL;
++ if (offset >= N810BM_PMM_ELEM_SIZE || length > N810BM_PMM_ELEM_SIZE ||
++ length + offset > N810BM_PMM_ELEM_SIZE)
++ return -EINVAL;
++
++ active_group_mask = pmm_area[16];
++ if (!(active_group_mask & (1 << group))) {
++ dev_dbg(&bm->pdev->dev, "pwm_record_get: Requested group %u, "
++ "but group is not active", group);
++ return -ENOENT;
++ }
++
++ memcpy(buffer,
++ pmm_area + group * N810BM_PMM_GROUP_SIZE
++ + element * N810BM_PMM_ELEM_SIZE
++ + offset,
++ length);
++
++ return 0;
++}
++
++/* PMM block group 1 element */
++struct group1_element {
++ u8 id;
++ u8 flags;
++ u8 adc_groupnr;
++ u8 _padding;
++ __le32 field1;
++ __le32 field2;
++} __packed;
++
++static int extract_group1_elem(struct n810bm *bm,
++ const struct firmware *pmm_block,
++ const enum n810bm_pmm_adc_id *pmm_adc_ids, size_t nr_pmm_adc_ids,
++ u32 field1_mask, u32 field2_mask)
++{
++ struct group1_element elem;
++ int err;
++ unsigned int i, element_nr;
++ struct n810bm_adc_calib *adc_calib;
++
++ for (i = 0; i < nr_pmm_adc_ids; i++) {
++ element_nr = (unsigned int)(pmm_adc_ids[i]) + 3;
++
++ err = pmm_record_get(bm, pmm_block, &elem, sizeof(elem),
++ 1, element_nr, 0);
++ if (err)
++ continue;
++ adc_calib = n810bm_get_adc_calib(bm, elem.id);
++ if (!adc_calib) {
++ dev_err(&bm->pdev->dev, "extract_group1_elem: "
++ "Could not get calib element for 0x%02X",
++ elem.id);
++ return -EINVAL;
++ }
++
++ if (adc_calib->flags == elem.flags) {
++ adc_calib->field1 = le32_to_cpu(elem.field1) & field1_mask;
++ adc_calib->field2 = le32_to_cpu(elem.field2) & field2_mask;
++ } else {
++ dev_dbg(&bm->pdev->dev, "extract_group1_elem: "
++ "Not extracting fields due to flags mismatch: "
++ "0x%02X vs 0x%02X",
++ adc_calib->flags, elem.flags);
++ }
++ }
++
++ return 0;
++}
++
++static int n810bm_parse_pmm_group1(struct n810bm *bm,
++ const struct firmware *pmm_block)
++{
++ struct n810bm_adc_calib *adc_calib;
++ struct group1_element elem;
++ int err;
++
++ static const enum n810bm_pmm_adc_id pmm_adc_ids_1[] = {
++ N810BM_PMM_ADC_BATVOLT,
++ N810BM_PMM_ADC_CHGVOLT,
++ N810BM_PMM_ADC_BKUPVOLT,
++ N810BM_PMM_ADC_BATCURR,
++ };
++ static const enum n810bm_pmm_adc_id pmm_adc_ids_2[] = {
++ N810BM_PMM_ADC_BSI,
++ };
++ static const enum n810bm_pmm_adc_id pmm_adc_ids_3[] = {
++ N810BM_PMM_ADC_BATTEMP,
++ };
++
++ /* Parse element 2 */
++ err = pmm_record_get(bm, pmm_block, &elem, sizeof(elem),
++ 1, 2, 0);
++ if (err) {
++ dev_err(&bm->pdev->dev,
++ "PMM: Failed to get group 1 / element 2");
++ return err;
++ }
++ if (elem.id == N810BM_PMM_ADC_0xFE && elem.flags == 0x05) {
++ adc_calib = n810bm_get_adc_calib(bm, elem.id);
++ if (!adc_calib) {
++ dev_err(&bm->pdev->dev,
++ "calib extract: Failed to get 0xFE calib");
++ return -EINVAL;
++ }
++ adc_calib->id = elem.id;
++ adc_calib->flags = elem.flags;
++ adc_calib->field1 = le32_to_cpu(elem.field1);
++ adc_calib->field2 = le32_to_cpu(elem.field2);
++ }
++
++ err = extract_group1_elem(bm, pmm_block,
++ pmm_adc_ids_1, ARRAY_SIZE(pmm_adc_ids_1),
++ 0xFFFFFFFF, 0xFFFFFFFF);
++ if (err)
++ return err;
++ err = extract_group1_elem(bm, pmm_block,
++ pmm_adc_ids_2, ARRAY_SIZE(pmm_adc_ids_2),
++ 0xFFFFFFFF, 0);
++ if (err)
++ return err;
++ err = extract_group1_elem(bm, pmm_block,
++ pmm_adc_ids_3, ARRAY_SIZE(pmm_adc_ids_3),
++ 0xFFFFFFFF, 0x0000FFFF);
++ if (err)
++ return err;
++
++ return 0;
++}
++
++static int n810bm_parse_pmm_group2(struct n810bm *bm,
++ const struct firmware *pmm_block)
++{
++ dev_err(&bm->pdev->dev, "TODO: CAL BME PMM group 2 parser not implemented, yet");
++ return -EOPNOTSUPP;
++}
++
++static void n810bm_adc_calib_set_defaults(struct n810bm *bm)
++{
++ struct n810bm_adc_calib *adc_calib;
++ unsigned int i;
++
++ static const struct n810bm_adc_calib defaults[] = {
++ /* ADC group-nr 0 */
++ {
++ .id = N810BM_PMM_ADC_HEADSET,
++ .flags = 0x00,
++ .adc_groupnr = 0,
++ }, {
++ .id = N810BM_PMM_ADC_HOOKDET,
++ .flags = 0x00,
++ .adc_groupnr = 0,
++ }, {
++ .id = N810BM_PMM_ADC_RFGP,
++ .flags = 0x00,
++ .adc_groupnr = 0,
++ }, {
++ .id = N810BM_PMM_ADC_LIGHTSENS,
++ .flags = 0x00,
++ .adc_groupnr = 0,
++ }, {
++ .id = N810BM_PMM_ADC_WBTX,
++ .flags = 0x00,
++ .adc_groupnr = 0,
++ }, {
++ .id = N810BM_PMM_ADC_RETUTEMP,
++ .flags = 0x00,
++ .adc_groupnr = 0,
++ }, {
++ .id = N810BM_PMM_ADC_GND2,
++ .flags = 0x00,
++ .adc_groupnr = 0,
++ },
++ /* ADC group-nr 1 */
++ {
++ .id = N810BM_PMM_ADC_0xFE,
++ .flags = 0x05,
++ .adc_groupnr = 1,
++ .field1 = (u32)-2,
++ .field2 = 13189,
++ }, {
++ .id = N810BM_PMM_ADC_BATVOLT,
++ .flags = 0x01,
++ .adc_groupnr = 1,
++ .field1 = 2527,
++ .field2 = 21373,
++ }, {
++ .id = N810BM_PMM_ADC_CHGVOLT,
++ .flags = 0x01,
++ .adc_groupnr = 1,
++ .field1 = 0,
++ .field2 = 129848,
++ }, {
++ .id = N810BM_PMM_ADC_BKUPVOLT,
++ .flags = 0x01,
++ .adc_groupnr = 1,
++ .field1 = 0,
++ .field2 = 20000,
++ }, {
++ .id = N810BM_PMM_ADC_BATCURR,
++ .flags = 0x06,
++ .adc_groupnr = 1,
++ .field1 = 0,
++ .field2 = 9660,
++ },
++ /* ADC group-nr 2 */
++ {
++ .id = N810BM_PMM_ADC_BSI,
++ .flags = 0x02,
++ .adc_groupnr = 2,
++ .field1 = 1169,
++ .field2 = 0,
++ },
++ /* ADC group-nr 3 */
++ {
++ .id = N810BM_PMM_ADC_BATTEMP,
++ .flags = 0x03,
++ .adc_groupnr = 3,
++ .field1 = 265423000,
++ .field2 = 298,
++ },
++ /* ADC group-nr 4 */
++ {
++ .id = N810BM_PMM_ADC_LIGHTTEMP,
++ .flags = 0x04,
++ .adc_groupnr = 4,
++ .field1 = 19533778,
++ .field2 = 308019670,
++ .field3 = 4700,
++ .field4 = 2500,
++ },
++ };
++
++ /* Clear the array */
++ memset(&bm->calib.adc, 0, sizeof(bm->calib.adc));
++ for (i = 0; i < ARRAY_SIZE(bm->calib.adc); i++)
++ bm->calib.adc[i].flags = 0xFF;
++
++ /* Copy the defaults */
++ for (i = 0; i < ARRAY_SIZE(defaults); i++) {
++ adc_calib = n810bm_get_adc_calib(bm, defaults[i].id);
++ if (WARN_ON(!adc_calib))
++ continue;
++ *adc_calib = defaults[i];
++ }
++}
++
++static int n810bm_parse_pmm_block(struct n810bm *bm,
++ const struct firmware *pmm_block)
++{
++ u8 byte;
++ int err;
++ unsigned int i, count;
++ struct n810bm_adc_calib *adc_calib;
++
++ /* Initialize to defaults */
++ n810bm_adc_calib_set_defaults(bm);
++
++ /* Parse the PMM data */
++ err = pmm_record_get(bm, pmm_block, &byte, sizeof(byte),
++ 1, 0, 0); /* group 1 / element 0 */
++ err |= (byte != 0x01);
++ err |= pmm_record_get(bm, pmm_block, &byte, sizeof(byte),
++ 1, 1, 0); /* group 1 / element 1 */
++ err |= (byte != 0x01);
++ if (err)
++ err = n810bm_parse_pmm_group2(bm, pmm_block);
++ else
++ err = n810bm_parse_pmm_group1(bm, pmm_block);
++ if (err)
++ return err;
++
++ /* Sanity checks */
++ for (i = 0, count = 0; i < ARRAY_SIZE(bm->calib.adc); i++) {
++ adc_calib = &bm->calib.adc[i];
++ if (adc_calib->flags == 0xFF)
++ continue;
++ switch (adc_calib->id) {
++ case N810BM_PMM_ADC_BATVOLT:
++ if (adc_calib->field1 < 2400 ||
++ adc_calib->field1 > 2700)
++ goto value_check_fail;
++ if (adc_calib->field2 < 20000 ||
++ adc_calib->field2 > 23000)
++ goto value_check_fail;
++ count++;
++ break;
++ case N810BM_PMM_ADC_BSI:
++ if (adc_calib->field1 < 1100 ||
++ adc_calib->field1 > 1300)
++ goto value_check_fail;
++ count++;
++ break;
++ case N810BM_PMM_ADC_BATCURR:
++ if (adc_calib->field2 < 7000 ||
++ adc_calib->field2 > 12000)
++ goto value_check_fail;
++ count++;
++ break;
++ case N810BM_PMM_ADC_0xFE:
++ if ((s32)adc_calib->field1 > 14 ||
++ (s32)adc_calib->field1 < -14)
++ goto value_check_fail;
++ if (adc_calib->field2 < 13000 ||
++ adc_calib->field2 > 13350)
++ goto value_check_fail;
++ count++;
++ break;
++ case N810BM_PMM_ADC_CHGVOLT:
++ case N810BM_PMM_ADC_BATTEMP:
++ case N810BM_PMM_ADC_BKUPVOLT:
++ count++;
++ break;
++ case N810BM_PMM_ADC_GND2:
++ case N810BM_PMM_ADC_HOOKDET:
++ case N810BM_PMM_ADC_LIGHTSENS:
++ case N810BM_PMM_ADC_HEADSET:
++ case N810BM_PMM_ADC_LIGHTTEMP:
++ case N810BM_PMM_ADC_RFGP:
++ case N810BM_PMM_ADC_WBTX:
++ case N810BM_PMM_ADC_RETUTEMP:
++ break;
++ }
++ dev_dbg(&bm->pdev->dev,
++ "ADC 0x%02X calib: 0x%02X 0x%02X 0x%08X 0x%08X 0x%04X 0x%04X",
++ adc_calib->id, adc_calib->flags, adc_calib->adc_groupnr,
++ adc_calib->field1, adc_calib->field2,
++ adc_calib->field3, adc_calib->field4);
++ }
++ if (count != 7) {
++ dev_err(&bm->pdev->dev, "PMM sanity check: Did not find "
++ "all required values (count=%u)", count);
++ goto check_fail;
++ }
++
++ return 0;
++
++value_check_fail:
++ dev_err(&bm->pdev->dev, "PMM image sanity check failed "
++ "(id=%02X, field1=%08X, field2=%08X)",
++ adc_calib->id, adc_calib->field1, adc_calib->field2);
++check_fail:
++ return -EILSEQ;
++}
++
++/* Set the current measure timer that triggers on Tahvo IRQ 7
++ * An interval of zero disables the timer. */
++static void n810bm_set_current_measure_timer(struct n810bm *bm,
++ u16 millisec_interval)
++{
++ u16 value = millisec_interval;
++
++ if (value <= 0xF905) {
++ value = ((u64)0x10624DD3 * (u64)(value + 0xF9)) >> 32;
++ value /= 16;
++ } else
++ value = 0xFF;
++
++ tahvo_write(bm, TAHVO_REG_BATCURRTIMER, value & 0xFF);
++
++ tahvo_set(bm, TAHVO_REG_CHGCTL,
++ TAHVO_REG_CHGCTL_CURTIMRST);
++ tahvo_clear(bm, TAHVO_REG_CHGCTL,
++ TAHVO_REG_CHGCTL_CURTIMRST);
++
++ if (millisec_interval) {
++ if (!bm->tahvo_irq_enabled) {
++ bm->tahvo_irq_enabled = 1;
++ enable_irq(bm->tahvo_irq);
++ }
++ } else {
++ if (bm->tahvo_irq_enabled) {
++ bm->tahvo_irq_enabled = 0;
++ disable_irq_nosync(bm->tahvo_irq);
++ }
++ }
++
++ //TODO also do a software timer for safety.
++}
++
++static void n810bm_enable_current_measure(struct n810bm *bm)
++{
++ WARN_ON(bm->current_measure_enabled < 0);
++ if (!bm->current_measure_enabled) {
++ /* Enable the current measurement circuitry */
++ tahvo_set(bm, TAHVO_REG_CHGCTL,
++ TAHVO_REG_CHGCTL_CURMEAS);
++ dev_dbg(&bm->pdev->dev,
++ "Current measurement circuitry enabled");
++ }
++ bm->current_measure_enabled++;
++}
++
++static void n810bm_disable_current_measure(struct n810bm *bm)
++{
++ bm->current_measure_enabled--;
++ WARN_ON(bm->current_measure_enabled < 0);
++ if (!bm->current_measure_enabled) {
++ /* Disable the current measurement circuitry */
++ tahvo_clear(bm, TAHVO_REG_CHGCTL,
++ TAHVO_REG_CHGCTL_CURMEAS);
++ dev_dbg(&bm->pdev->dev,
++ "Current measurement circuitry disabled");
++ }
++}
++
++/* Measure the actual battery current. Returns a signed value in mA.
++ * Does only work, if current measurement was enabled. */
++static int n810bm_measure_batt_current(struct n810bm *bm)
++{
++ u16 retval;
++ int adc = 0, ma, i;
++
++ if (WARN_ON(bm->current_measure_enabled <= 0))
++ return 0;
++ for (i = 0; i < 3; i++) {
++ retval = tahvo_read(bm, TAHVO_REG_BATCURR);
++ adc += (s16)retval; /* Value is signed */
++ }
++ adc /= 3;
++
++ //TODO convert to mA
++ ma = adc;
++
++ return ma;
++}
++
++/* Requires bm->mutex locked */
++static int n810bm_measure_batt_current_async(struct n810bm *bm)
++{
++ int ma;
++ bool charging = lipocharge_is_charging(&bm->charger);
++
++ n810bm_enable_current_measure(bm);
++ if (!charging)
++ WARN_ON(bm->active_current_pwm != 0);
++ tahvo_maskset(bm, TAHVO_REG_CHGCTL,
++ TAHVO_REG_CHGCTL_EN |
++ TAHVO_REG_CHGCTL_PWMOVR |
++ TAHVO_REG_CHGCTL_PWMOVRZERO,
++ TAHVO_REG_CHGCTL_EN |
++ TAHVO_REG_CHGCTL_PWMOVR |
++ (charging ? 0 : TAHVO_REG_CHGCTL_PWMOVRZERO));
++ ma = n810bm_measure_batt_current(bm);
++ tahvo_maskset(bm, TAHVO_REG_CHGCTL,
++ TAHVO_REG_CHGCTL_EN |
++ TAHVO_REG_CHGCTL_PWMOVR |
++ TAHVO_REG_CHGCTL_PWMOVRZERO,
++ (charging ? TAHVO_REG_CHGCTL_EN : 0));
++ n810bm_disable_current_measure(bm);
++
++ return ma;
++}
++
++static int adc_sanity_check(struct n810bm *bm, unsigned int channel)
++{
++ int value;
++
++ value = retu_read_adc(&n810bm_retu_device->dev, channel);
++ if (value < 0) {
++ dev_err(&bm->pdev->dev, "Failed to read GND ADC channel %u",
++ channel);
++ return -EIO;
++ }
++ dev_dbg(&bm->pdev->dev,
++ "GND ADC channel %u sanity check got value: %d",
++ channel, value);
++ if (value > 5) {
++ n810bm_emergency(bm, "GND ADC sanity check failed");
++ return -EIO;
++ }
++
++ return 0;
++}
++
++static int n810bm_check_adc_sanity(struct n810bm *bm)
++{
++ int err;
++
++ /* Discard one conversion */
++ retu_write(bm, RETU_REG_ADCSCR, 0);
++ retu_read_adc(&n810bm_retu_device->dev, RETU_ADC_GND2);
++
++ err = adc_sanity_check(bm, RETU_ADC_GND2);
++ if (err)
++ return err;
++
++ return 0;
++}
++
++/* Measure the battery voltage. Returns the value in mV (or negative value on error). */
++static int n810bm_measure_batt_voltage(struct n810bm *bm)
++{
++ int adc;
++ unsigned int mv;
++ const unsigned int scale = 1000;
++
++ adc = retu_adc_average(bm, RETU_ADC_BATTVOLT, 5);
++ if (adc < 0)
++ return adc;
++ if (adc <= 0x37)
++ return 2800;
++ mv = 2800 + ((adc - 0x37) * (((4200 - 2800) * scale) / (0x236 - 0x37))) / scale;
++
++ //TODO compensate for power consumption
++ //TODO honor calibration values
++
++ return mv;
++}
++
++/* Measure the charger voltage. Returns the value in mV (or negative value on error). */
++static int n810bm_measure_charger_voltage(struct n810bm *bm)
++{
++ int adc;
++ unsigned int mv;
++
++ adc = retu_adc_average(bm, RETU_ADC_CHGVOLT, 5);
++ if (adc < 0)
++ return adc;
++ //TODO convert to mV
++ mv = adc;
++
++ return mv;
++}
++
++/* Measure backup battery voltage. Returns the value in mV (or negative value on error). */
++static int n810bm_measure_backup_batt_voltage(struct n810bm *bm)
++{
++ int adc;
++ unsigned int mv;
++
++ adc = retu_adc_average(bm, RETU_ADC_BKUPVOLT, 3);
++ if (adc < 0)
++ return adc;
++ //TODO convert to mV
++ mv = adc;
++
++ return mv;
++}
++
++/* Measure the battery temperature. Returns the value in K (or negative value on error). */
++static int n810bm_measure_batt_temp(struct n810bm *bm)
++{
++ int adc;
++ unsigned int k;
++
++ adc = retu_adc_average(bm, RETU_ADC_BATTEMP, 3);
++ if (adc < 0)
++ return adc;
++ //TODO convert to K
++ k = adc;
++
++ return k;
++}
++
++/* Read the battery capacity via BSI pin. */
++static enum n810bm_capacity n810bm_read_batt_capacity(struct n810bm *bm)
++{
++ int adc;
++ const unsigned int hyst = 20;
++
++ adc = retu_adc_average(bm, RETU_ADC_BSI, 5);
++ if (adc < 0) {
++ dev_err(&bm->pdev->dev, "Failed to read BSI ADC");
++ return N810BM_CAP_UNKNOWN;
++ }
++
++ if (adc >= 0x3B5 - hyst && adc <= 0x3B5 + hyst)
++ return N810BM_CAP_1500MAH;
++
++ dev_err(&bm->pdev->dev, "Capacity indicator 0x%X unknown", adc);
++
++ return N810BM_CAP_UNKNOWN;
++}
++
++/* Convert a battery voltage (in mV) to percentage. */
++static unsigned int n810bm_mvolt2percent(unsigned int mv)
++{
++ const unsigned int minv = 3700;
++ const unsigned int maxv = 4150;
++ unsigned int percent;
++
++ mv = clamp(mv, minv, maxv);
++ percent = (mv - minv) * 100 / (maxv - minv);
++
++ return percent;
++}
++
++static void n810bm_start_charge(struct n810bm *bm)
++{
++ int err;
++
++ WARN_ON(!bm->battery_present);
++ WARN_ON(!bm->charger_present);
++
++ /* Set PWM to zero */
++ bm->active_current_pwm = 0;
++ tahvo_write(bm, TAHVO_REG_CHGCURR, bm->active_current_pwm);
++
++ /* Charge global enable */
++ tahvo_maskset(bm, TAHVO_REG_CHGCTL,
++ TAHVO_REG_CHGCTL_EN |
++ TAHVO_REG_CHGCTL_PWMOVR |
++ TAHVO_REG_CHGCTL_PWMOVRZERO,
++ TAHVO_REG_CHGCTL_EN);
++
++ WARN_ON((int)bm->capacity <= 0);
++ bm->charger.capacity = bm->capacity;
++ err = lipocharge_start(&bm->charger);
++ WARN_ON(err);
++
++ /* Initialize current measurement circuitry */
++ n810bm_enable_current_measure(bm);
++ n810bm_set_current_measure_timer(bm, 250);
++
++ dev_info(&bm->pdev->dev, "Charging battery");
++ n810bm_notify_charger_state(bm);
++ n810bm_notify_charger_pwm(bm);
++}
++
++static void n810bm_stop_charge(struct n810bm *bm)
++{
++ if (lipocharge_is_charging(&bm->charger)) {
++ n810bm_set_current_measure_timer(bm, 0);
++ n810bm_disable_current_measure(bm);
++ }
++ lipocharge_stop(&bm->charger);
++
++ /* Set PWM to zero */
++ bm->active_current_pwm = 0;
++ tahvo_write(bm, TAHVO_REG_CHGCURR, bm->active_current_pwm);
++
++ /* Charge global disable */
++ tahvo_maskset(bm, TAHVO_REG_CHGCTL,
++ TAHVO_REG_CHGCTL_EN |
++ TAHVO_REG_CHGCTL_PWMOVR |
++ TAHVO_REG_CHGCTL_PWMOVRZERO,
++ 0);
++
++ dev_info(&bm->pdev->dev, "Not charging battery");
++ n810bm_notify_charger_state(bm);
++ n810bm_notify_charger_pwm(bm);
++}
++
++/* Periodic check */
++static void n810bm_periodic_check_work(struct work_struct *work)
++{
++ struct n810bm *bm = container_of(to_delayed_work(work),
++ struct n810bm, periodic_check_work);
++ u16 status;
++ bool battery_was_present, charger_was_present;
++ int mv;
++
++ mutex_lock(&bm->mutex);
++
++ status = retu_read(bm, RETU_REG_STATUS);
++ battery_was_present = bm->battery_present;
++ charger_was_present = bm->charger_present;
++ bm->battery_present = !!(status & RETU_REG_STATUS_BATAVAIL);
++ bm->charger_present = !!(status & RETU_REG_STATUS_CHGPLUG);
++
++ if (bm->battery_present != battery_was_present) {
++ /* Battery state changed */
++ if (bm->battery_present) {
++ bm->capacity = n810bm_read_batt_capacity(bm);
++ if (bm->capacity == N810BM_CAP_UNKNOWN) {
++ dev_err(&bm->pdev->dev, "Unknown battery detected");
++ } else {
++ dev_info(&bm->pdev->dev, "Detected %u mAh battery",
++ (unsigned int)bm->capacity);
++ }
++ } else {
++ bm->capacity = N810BM_CAP_NONE;
++ dev_info(&bm->pdev->dev, "The main battery was removed");
++ //TODO disable charging
++ }
++ }
++
++ if (bm->charger_present != charger_was_present) {
++ /* Charger state changed */
++ dev_info(&bm->pdev->dev, "The charger was %s",
++ bm->charger_present ? "plugged in" : "removed");
++ n810bm_notify_charger_present(bm);
++ }
++
++ if ((bm->battery_present && !bm->charger_present) ||
++ !n810bm_known_battery_present(bm)){
++ /* We're draining the battery */
++ mv = n810bm_measure_batt_voltage(bm);
++ if (mv < 0) {
++ n810bm_emergency(bm,
++ "check: Failed to measure voltage");
++ }
++ if (mv < N810BM_MIN_VOLTAGE_THRES) {
++ n810bm_emergency(bm,
++ "check: Minimum voltage threshold reached");
++ }
++ }
++
++ if (bm->charger_present && n810bm_known_battery_present(bm)) {
++ /* Known battery and charger are connected */
++ if (bm->charger_enabled) {
++ /* Charger is enabled */
++ if (!lipocharge_is_charging(&bm->charger)) {
++ //TODO start charging, if battery is below some threshold
++ n810bm_start_charge(bm);
++ }
++ }
++ }
++
++ if (lipocharge_is_charging(&bm->charger) && !bm->charger_present) {
++ /* Charger was unplugged. */
++ n810bm_stop_charge(bm);
++ }
++
++ mutex_unlock(&bm->mutex);
++ schedule_delayed_work(&bm->periodic_check_work,
++ round_jiffies_relative(N810BM_CHECK_INTERVAL));
++}
++
++/*XXX
++static void n810bm_adc_irq_handler(unsigned long data)
++{
++ struct n810bm *bm = (struct n810bm *)data;
++
++ retu_ack_irq(RETU_INT_ADCS);
++ //TODO
++dev_info(&bm->pdev->dev, "ADC interrupt triggered\n");
++}
++*/
++
++static irqreturn_t n810bm_tahvo_current_measure_irq_handler(int irq, void *data)
++{
++ struct n810bm *bm = data;
++ int res, ma, mv, temp;
++
++ mutex_lock(&bm->mutex);
++ if (!lipocharge_is_charging(&bm->charger))
++ goto out_unlock;
++
++ tahvo_maskset(bm, TAHVO_REG_CHGCTL,
++ TAHVO_REG_CHGCTL_PWMOVR |
++ TAHVO_REG_CHGCTL_PWMOVRZERO,
++ TAHVO_REG_CHGCTL_PWMOVR);
++ ma = n810bm_measure_batt_current(bm);
++ tahvo_maskset(bm, TAHVO_REG_CHGCTL,
++ TAHVO_REG_CHGCTL_PWMOVR |
++ TAHVO_REG_CHGCTL_PWMOVRZERO,
++ TAHVO_REG_CHGCTL_PWMOVR |
++ TAHVO_REG_CHGCTL_PWMOVRZERO);
++ msleep(10);
++ mv = n810bm_measure_batt_voltage(bm);
++ tahvo_maskset(bm, TAHVO_REG_CHGCTL,
++ TAHVO_REG_CHGCTL_PWMOVR |
++ TAHVO_REG_CHGCTL_PWMOVRZERO,
++ 0);
++ temp = n810bm_measure_batt_temp(bm);
++ if (WARN_ON(mv < 0))
++ goto out_unlock;
++ if (WARN_ON(temp < 0))
++ goto out_unlock;
++
++ if (bm->verbose_charge_log) {
++ dev_info(&bm->pdev->dev,
++ "Battery charge state: %d mV, %d mA (%s)",
++ mv, ma,
++ (ma <= 0) ? "discharging" : "charging");
++ }
++ res = lipocharge_update_state(&bm->charger, mv, ma, temp);
++ if (res) {
++ if (res > 0)
++ dev_info(&bm->pdev->dev, "Battery fully charged");
++ n810bm_stop_charge(bm);
++ }
++out_unlock:
++ mutex_unlock(&bm->mutex);
++
++ return IRQ_HANDLED;
++}
++
++#define DEFINE_ATTR_NOTIFY(attr_name) \
++ void n810bm_notify_##attr_name(struct n810bm *bm) \
++ { \
++ set_bit(N810BM_NOTIFY_##attr_name, &bm->notify_flags); \
++ wmb(); \
++ schedule_work(&bm->notify_work); \
++ }
++
++#define DEFINE_SHOW_INT_FUNC(name, member) \
++ static ssize_t n810bm_attr_##name##_show(struct device *dev, \
++ struct device_attribute *attr, \
++ char *buf) \
++ { \
++ struct n810bm *bm = device_to_n810bm(dev); \
++ ssize_t count; \
++ \
++ mutex_lock(&bm->mutex); \
++ count = snprintf(buf, PAGE_SIZE, "%d\n", (int)(bm->member)); \
++ mutex_unlock(&bm->mutex); \
++ \
++ return count; \
++ }
++
++#define DEFINE_STORE_INT_FUNC(name, member) \
++ static ssize_t n810bm_attr_##name##_store(struct device *dev, \
++ struct device_attribute *attr,\
++ const char *buf, size_t count)\
++ { \
++ struct n810bm *bm = device_to_n810bm(dev); \
++ long val; \
++ int err; \
++ \
++ mutex_lock(&bm->mutex); \
++ err = strict_strtol(buf, 0, &val); \
++ if (!err) \
++ bm->member = (typeof(bm->member))val; \
++ mutex_unlock(&bm->mutex); \
++ \
++ return err ? err : count; \
++ }
++
++#define DEFINE_ATTR_SHOW_INT(name, member) \
++ DEFINE_SHOW_INT_FUNC(name, member) \
++ static DEVICE_ATTR(name, S_IRUGO, \
++ n810bm_attr_##name##_show, NULL);
++
++#define DEFINE_ATTR_SHOW_STORE_INT(name, member) \
++ DEFINE_SHOW_INT_FUNC(name, member) \
++ DEFINE_STORE_INT_FUNC(name, member) \
++ static DEVICE_ATTR(name, S_IRUGO | S_IWUSR, \
++ n810bm_attr_##name##_show, \
++ n810bm_attr_##name##_store);
++
++DEFINE_ATTR_SHOW_INT(battery_present, battery_present);
++DEFINE_ATTR_SHOW_INT(charger_present, charger_present);
++static DEFINE_ATTR_NOTIFY(charger_present);
++DEFINE_ATTR_SHOW_INT(charger_state, charger.state);
++static DEFINE_ATTR_NOTIFY(charger_state);
++DEFINE_ATTR_SHOW_INT(charger_pwm, active_current_pwm);
++static DEFINE_ATTR_NOTIFY(charger_pwm);
++DEFINE_ATTR_SHOW_STORE_INT(charger_enable, charger_enabled);
++DEFINE_ATTR_SHOW_STORE_INT(charger_verbose, verbose_charge_log);
++
++static ssize_t n810bm_attr_battery_level_show(struct device *dev,
++ struct device_attribute *attr,
++ char *buf)
++{
++ struct n810bm *bm = device_to_n810bm(dev);
++ ssize_t count = -ENODEV;
++ int millivolt;
++
++ mutex_lock(&bm->mutex);
++ if (!bm->battery_present || lipocharge_is_charging(&bm->charger))
++ millivolt = 0;
++ else
++ millivolt = n810bm_measure_batt_voltage(bm);
++ if (millivolt >= 0) {
++ count = snprintf(buf, PAGE_SIZE, "%u\n",
++ n810bm_mvolt2percent(millivolt));
++ }
++ mutex_unlock(&bm->mutex);
++
++ return count;
++}
++static DEVICE_ATTR(battery_level, S_IRUGO,
++ n810bm_attr_battery_level_show, NULL);
++
++static ssize_t n810bm_attr_battery_capacity_show(struct device *dev,
++ struct device_attribute *attr,
++ char *buf)
++{
++ struct n810bm *bm = device_to_n810bm(dev);
++ ssize_t count;
++ int capacity = 0;
++
++ mutex_lock(&bm->mutex);
++ if (n810bm_known_battery_present(bm))
++ capacity = (int)bm->capacity;
++ count = snprintf(buf, PAGE_SIZE, "%d\n", capacity);
++ mutex_unlock(&bm->mutex);
++
++ return count;
++}
++static DEVICE_ATTR(battery_capacity, S_IRUGO,
++ n810bm_attr_battery_capacity_show, NULL);
++
++static ssize_t n810bm_attr_battery_temp_show(struct device *dev,
++ struct device_attribute *attr,
++ char *buf)
++{
++ struct n810bm *bm = device_to_n810bm(dev);
++ ssize_t count = -ENODEV;
++ int k;
++
++ mutex_lock(&bm->mutex);
++ k = n810bm_measure_batt_temp(bm);
++ if (k >= 0)
++ count = snprintf(buf, PAGE_SIZE, "%d\n", k);
++ mutex_unlock(&bm->mutex);
++
++ return count;
++}
++static DEVICE_ATTR(battery_temp, S_IRUGO,
++ n810bm_attr_battery_temp_show, NULL);
++
++static ssize_t n810bm_attr_charger_voltage_show(struct device *dev,
++ struct device_attribute *attr,
++ char *buf)
++{
++ struct n810bm *bm = device_to_n810bm(dev);
++ ssize_t count = -ENODEV;
++ int mv = 0;
++
++ mutex_lock(&bm->mutex);
++ if (bm->charger_present)
++ mv = n810bm_measure_charger_voltage(bm);
++ if (mv >= 0)
++ count = snprintf(buf, PAGE_SIZE, "%d\n", mv);
++ mutex_unlock(&bm->mutex);
++
++ return count;
++}
++static DEVICE_ATTR(charger_voltage, S_IRUGO,
++ n810bm_attr_charger_voltage_show, NULL);
++
++static ssize_t n810bm_attr_backup_battery_voltage_show(struct device *dev,
++ struct device_attribute *attr,
++ char *buf)
++{
++ struct n810bm *bm = device_to_n810bm(dev);
++ ssize_t count = -ENODEV;
++ int mv;
++
++ mutex_lock(&bm->mutex);
++ mv = n810bm_measure_backup_batt_voltage(bm);
++ if (mv >= 0)
++ count = snprintf(buf, PAGE_SIZE, "%d\n", mv);
++ mutex_unlock(&bm->mutex);
++
++ return count;
++}
++static DEVICE_ATTR(backup_battery_voltage, S_IRUGO,
++ n810bm_attr_backup_battery_voltage_show, NULL);
++
++static ssize_t n810bm_attr_battery_current_show(struct device *dev,
++ struct device_attribute *attr,
++ char *buf)
++{
++ struct n810bm *bm = device_to_n810bm(dev);
++ ssize_t count = -ENODEV;
++ int ma = 0;
++
++ mutex_lock(&bm->mutex);
++ if (bm->battery_present)
++ ma = n810bm_measure_batt_current_async(bm);
++ count = snprintf(buf, PAGE_SIZE, "%d\n", ma);
++ mutex_unlock(&bm->mutex);
++
++ return count;
++}
++static DEVICE_ATTR(battery_current, S_IRUGO,
++ n810bm_attr_battery_current_show, NULL);
++
++static const struct device_attribute *n810bm_attrs[] = {
++ &dev_attr_battery_present,
++ &dev_attr_battery_level,
++ &dev_attr_battery_current,
++ &dev_attr_battery_capacity,
++ &dev_attr_battery_temp,
++ &dev_attr_backup_battery_voltage,
++ &dev_attr_charger_present,
++ &dev_attr_charger_state,
++ &dev_attr_charger_verbose,
++ &dev_attr_charger_voltage,
++ &dev_attr_charger_enable,
++ &dev_attr_charger_pwm,
++};
++
++static void n810bm_notify_work(struct work_struct *work)
++{
++ struct n810bm *bm = container_of(work, struct n810bm, notify_work);
++ unsigned long notify_flags;
++
++ notify_flags = xchg(&bm->notify_flags, 0);
++ mb();
++
++#define do_notify(attr_name) \
++ do { \
++ if (notify_flags & (1 << N810BM_NOTIFY_##attr_name)) { \
++ sysfs_notify(&bm->pdev->dev.kobj, NULL, \
++ dev_attr_##attr_name.attr.name); \
++ } \
++ } while (0)
++
++ do_notify(charger_present);
++ do_notify(charger_state);
++ do_notify(charger_pwm);
++}
++
++static int n810bm_charger_set_current_pwm(struct lipocharge *c,
++ unsigned int duty_cycle)
++{
++ struct n810bm *bm = container_of(c, struct n810bm, charger);
++ int err = -EINVAL;
++
++ WARN_ON(!mutex_is_locked(&bm->mutex));
++ if (WARN_ON(duty_cycle > 0xFF))
++ goto out;
++ if (WARN_ON(!bm->charger_enabled))
++ goto out;
++ if (WARN_ON(!bm->battery_present || !bm->charger_present))
++ goto out;
++
++ if (duty_cycle != bm->active_current_pwm) {
++ bm->active_current_pwm = duty_cycle;
++ tahvo_write(bm, TAHVO_REG_CHGCURR, duty_cycle);
++ n810bm_notify_charger_pwm(bm);
++ }
++
++ err = 0;
++out:
++
++ return err;
++}
++
++static void n810bm_charger_emergency(struct lipocharge *c)
++{
++ struct n810bm *bm = container_of(c, struct n810bm, charger);
++
++ n810bm_emergency(bm, "Battery charger fault");
++}
++
++static void n810bm_hw_exit(struct n810bm *bm)
++{
++ n810bm_stop_charge(bm);
++ retu_write(bm, RETU_REG_ADCSCR, 0);
++}
++
++static int n810bm_hw_init(struct n810bm *bm)
++{
++ int err;
++
++ err = n810bm_check_adc_sanity(bm);
++ if (err)
++ return err;
++
++ n810bm_stop_charge(bm);
++
++ return 0;
++}
++
++static void n810bm_cancel_and_flush_work(struct n810bm *bm)
++{
++ cancel_delayed_work_sync(&bm->periodic_check_work);
++ cancel_work_sync(&bm->notify_work);
++ flush_scheduled_work();
++}
++
++static int n810bm_device_init(struct n810bm *bm)
++{
++ int attr_index;
++ int err;
++
++ bm->charger.rate = LIPORATE_p6C;
++ bm->charger.top_voltage = 4100;
++ bm->charger.duty_cycle_max = 0xFF;
++ bm->charger.set_current_pwm = n810bm_charger_set_current_pwm;
++ bm->charger.emergency = n810bm_charger_emergency;
++ lipocharge_init(&bm->charger, &bm->pdev->dev);
++
++ err = n810bm_hw_init(bm);
++ if (err)
++ goto error;
++ for (attr_index = 0; attr_index < ARRAY_SIZE(n810bm_attrs); attr_index++) {
++ err = device_create_file(&bm->pdev->dev, n810bm_attrs[attr_index]);
++ if (err)
++ goto err_unwind_attrs;
++ }
++/*XXX
++ err = retu_request_irq(RETU_INT_ADCS,
++ n810bm_adc_irq_handler,
++ (unsigned long)bm, "n810bm");
++ if (err)
++ goto err_unwind_attrs;
++*/
++ bm->tahvo_irq = platform_get_irq(n810bm_tahvo_device, 0);
++ err = request_threaded_irq(bm->tahvo_irq, NULL,
++ n810bm_tahvo_current_measure_irq_handler,
++ IRQF_ONESHOT, "tahvo-n810bm", bm);
++ if (err)
++ goto err_free_retu_irq;
++ disable_irq_nosync(bm->tahvo_irq);
++ bm->tahvo_irq_enabled = 0;
++
++ schedule_delayed_work(&bm->periodic_check_work,
++ round_jiffies_relative(N810BM_CHECK_INTERVAL));
++
++ bm->initialized = 1;
++ dev_info(&bm->pdev->dev, "Battery management initialized");
++
++ return 0;
++
++err_free_retu_irq:
++//XXX retu_free_irq(RETU_INT_ADCS);
++err_unwind_attrs:
++ for (attr_index--; attr_index >= 0; attr_index--)
++ device_remove_file(&bm->pdev->dev, n810bm_attrs[attr_index]);
++/*err_exit:*/
++ n810bm_hw_exit(bm);
++error:
++ n810bm_cancel_and_flush_work(bm);
++
++ return err;
++}
++
++static void n810bm_device_exit(struct n810bm *bm)
++{
++ int i;
++
++ if (!bm->initialized)
++ return;
++
++ lipocharge_exit(&bm->charger);
++ free_irq(bm->tahvo_irq, bm);
++//XXX retu_free_irq(RETU_INT_ADCS);
++ for (i = 0; i < ARRAY_SIZE(n810bm_attrs); i++)
++ device_remove_file(&bm->pdev->dev, n810bm_attrs[i]);
++
++ n810bm_cancel_and_flush_work(bm);
++
++ n810bm_hw_exit(bm);
++
++ bm->initialized = 0;
++}
++
++static void n810bm_pmm_block_found(const struct firmware *fw, void *context)
++{
++ struct n810bm *bm = context;
++ int err;
++
++ if (!fw) {
++ dev_err(&bm->pdev->dev,
++ "CAL PMM block image file not found");
++ goto err_release;
++ }
++ if (fw->size != N810BM_PMM_BLOCK_SIZE ||
++ memcmp(fw->data, "BME-PMM-BLOCK01", 15) != 0) {
++ dev_err(&bm->pdev->dev,
++ "CAL PMM block image file has an invalid format");
++ goto err_release;
++ }
++
++ err = n810bm_parse_pmm_block(bm, fw);
++ if (err)
++ goto err_release;
++ release_firmware(fw);
++
++ err = n810bm_device_init(bm);
++ if (err) {
++ dev_err(&bm->pdev->dev,
++ "Failed to initialized battery management (%d)", err);
++ goto error;
++ }
++
++ return;
++err_release:
++ release_firmware(fw);
++error:
++ return;
++}
++
++static int __devinit n810bm_probe(void)
++{
++ struct n810bm *bm;
++ int err;
++
++ if (!n810bm_retu_device || !n810bm_tahvo_device)
++ return 0;
++
++ bm = kzalloc(sizeof(*bm), GFP_KERNEL);
++ if (!bm)
++ return -ENOMEM;
++ bm->pdev = n810bm_retu_device;
++ platform_set_drvdata(n810bm_retu_device, bm);
++ platform_set_drvdata(n810bm_tahvo_device, bm);
++ mutex_init(&bm->mutex);
++ INIT_DELAYED_WORK(&bm->periodic_check_work, n810bm_periodic_check_work);
++ INIT_WORK(&bm->notify_work, n810bm_notify_work);
++
++ dev_info(&bm->pdev->dev, "Requesting CAL BME PMM block firmware file "
++ N810BM_PMM_BLOCK_FILENAME);
++ err = request_firmware_nowait(THIS_MODULE, 1,
++ N810BM_PMM_BLOCK_FILENAME,
++ &bm->pdev->dev, GFP_KERNEL,
++ bm, n810bm_pmm_block_found);
++ if (err) {
++ dev_err(&bm->pdev->dev,
++ "Failed to request CAL PMM block image file (%d)", err);
++ goto err_free;
++ }
++
++ return 0;
++
++err_free:
++ kfree(bm);
++
++ return err;
++}
++
++static void __devexit n810bm_remove(void)
++{
++ struct n810bm *bm;
++
++ if (!n810bm_retu_device || !n810bm_tahvo_device)
++ return;
++ bm = platform_get_drvdata(n810bm_retu_device);
++
++ n810bm_device_exit(bm);
++
++ kfree(bm);
++ platform_set_drvdata(n810bm_retu_device, NULL);
++ platform_set_drvdata(n810bm_tahvo_device, NULL);
++}
++
++static int __devinit n810bm_retu_probe(struct platform_device *pdev)
++{
++ n810bm_retu_device = pdev;
++ return n810bm_probe();
++}
++
++static int __devexit n810bm_retu_remove(struct platform_device *pdev)
++{
++ n810bm_remove();
++ n810bm_retu_device = NULL;
++ return 0;
++}
++
++static int __devinit n810bm_tahvo_probe(struct platform_device *pdev)
++{
++ n810bm_tahvo_device = pdev;
++ return n810bm_probe();
++}
++
++static int __devexit n810bm_tahvo_remove(struct platform_device *pdev)
++{
++ n810bm_remove();
++ n810bm_tahvo_device = NULL;
++ return 0;
++}
++
++static struct platform_driver n810bm_retu_driver = {
++ .remove = __devexit_p(n810bm_retu_remove),
++ .driver = {
++ .name = "retu-n810bm",
++ }
++};
++
++static struct platform_driver n810bm_tahvo_driver = {
++ .remove = __devexit_p(n810bm_tahvo_remove),
++ .driver = {
++ .name = "tahvo-n810bm",
++ }
++};
++
++static int __init n810bm_modinit(void)
++{
++ int err;
++
++ err = platform_driver_probe(&n810bm_retu_driver, n810bm_retu_probe);
++ if (err)
++ return err;
++ err = platform_driver_probe(&n810bm_tahvo_driver, n810bm_tahvo_probe);
++ if (err) {
++ platform_driver_unregister(&n810bm_retu_driver);
++ return err;
++ }
++
++ return 0;
++}
++module_init(n810bm_modinit);
++
++static void __exit n810bm_modexit(void)
++{
++ platform_driver_unregister(&n810bm_tahvo_driver);
++ platform_driver_unregister(&n810bm_retu_driver);
++}
++module_exit(n810bm_modexit);
++
++MODULE_DESCRIPTION("Nokia n810 battery management");
++MODULE_FIRMWARE(N810BM_PMM_BLOCK_FILENAME);
++MODULE_LICENSE("GPL");
++MODULE_AUTHOR("Michael Buesch");
+--- /dev/null
++++ b/drivers/cbus/lipocharge.c
+@@ -0,0 +1,183 @@
++/*
++ * Generic LIPO battery charger
++ *
++ * Copyright (c) 2010-2011 Michael Buesch <mb@bu3sch.de>
++ *
++ * This program is free software; you can redistribute it and/or
++ * modify it under the terms of the GNU General Public License
++ * as published by the Free Software Foundation; either version 2
++ * of the License, or (at your option) any later version.
++ *
++ * This program is distributed in the hope that it will be useful,
++ * but WITHOUT ANY WARRANTY; without even the implied warranty of
++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
++ * GNU General Public License for more details.
++ */
++
++#define DEBUG
++
++#include "lipocharge.h"
++
++#include <linux/slab.h>
++
++
++/* Hysteresis constants */
++#define CURRENT_HYST 30 /* mA */
++#define VOLTAGE_HYST 10 /* mV */
++
++/* Threshold constants */
++#define FINISH_CURRENT_PERCENT 3
++
++
++/* Returns the requested first-stage charge current in mA */
++static inline unsigned int get_stage1_charge_current(struct lipocharge *c)
++{
++ /* current = (capacity * C) */
++ return c->capacity * c->rate / 1000;
++}
++
++void lipocharge_init(struct lipocharge *c, struct device *dev)
++{
++ c->dev = dev;
++ c->state = LIPO_IDLE;
++}
++
++void lipocharge_exit(struct lipocharge *c)
++{
++ c->state = LIPO_IDLE;
++}
++
++int lipocharge_start(struct lipocharge *c)
++{
++ int err;
++
++ if (c->state != LIPO_IDLE)
++ return -EBUSY;
++ if (!c->set_current_pwm || !c->emergency)
++ return -EINVAL;
++ if (!c->top_voltage || c->top_voltage > 4200)
++ return -EINVAL;
++
++ c->active_duty_cycle = 0;
++ err = c->set_current_pwm(c, c->active_duty_cycle);
++ if (err)
++ return err;
++ c->state = LIPO_FIRST_STAGE;
++
++ return 0;
++}
++
++void lipocharge_stop(struct lipocharge *c)
++{
++ if (c->state == LIPO_IDLE)
++ return;
++ c->state = LIPO_IDLE;
++}
++
++static int lipocharge_increase_current(struct lipocharge *c,
++ unsigned int inc_permille)
++{
++ int old_pwm, new_pwm;
++
++ if (c->active_duty_cycle >= c->duty_cycle_max)
++ return 0;
++
++ old_pwm = c->active_duty_cycle;
++ new_pwm = old_pwm + (c->duty_cycle_max * inc_permille / 1000);
++ new_pwm = min(new_pwm, (int)c->duty_cycle_max);
++ c->active_duty_cycle = new_pwm;
++
++ dev_dbg(c->dev, "lipo: Increasing duty_cycle by "
++ "%u permille (0x%02X -> 0x%02X)",
++ inc_permille, old_pwm, new_pwm);
++
++ return c->set_current_pwm(c, c->active_duty_cycle);
++}
++
++static int lipocharge_decrease_current(struct lipocharge *c,
++ unsigned int dec_permille)
++{
++ int old_pwm, new_pwm;
++
++ if (c->active_duty_cycle <= 0)
++ return 0;
++
++ old_pwm = c->active_duty_cycle;
++ new_pwm = old_pwm - (c->duty_cycle_max * dec_permille / 1000);
++ new_pwm = max(0, new_pwm);
++ c->active_duty_cycle = new_pwm;
++
++ dev_dbg(c->dev, "lipo: Decreasing duty_cycle by "
++ "%u permille (0x%02X -> 0x%02X)",
++ dec_permille, old_pwm, new_pwm);
++
++ return c->set_current_pwm(c, c->active_duty_cycle);
++}
++
++/** lipocharge_update_state - Update the charge state
++ * @c: The context.
++ * @voltage_mV: The measured battery voltage.
++ * @current_mA: The measured charge current.
++ * negative -> drain.
++ * positive -> charge.
++ * @temp_K: Battery temperature in K.
++ *
++ * Returns 0 on success, -1 on error.
++ * Returns 1, if the charging process is finished.
++ */
++int lipocharge_update_state(struct lipocharge *c,
++ unsigned int voltage_mV,
++ int current_mA,
++ unsigned int temp_K)
++{
++ int requested_current, current_diff;
++ int err;
++ unsigned int permille;
++
++ //TODO temp
++
++restart:
++ switch (c->state) {
++ case LIPO_IDLE:
++ dev_err(c->dev, "%s: called while idle", __func__);
++ return -EINVAL;
++ case LIPO_FIRST_STAGE: /* Constant current */
++//printk("GOT %u %d %u\n", voltage_mV, current_mA, temp_K);
++ if (voltage_mV >= c->top_voltage) {
++ /* Float voltage reached.
++ * Switch charger mode to "constant current" */
++ c->state = LIPO_SECOND_STAGE;
++ dev_dbg(c->dev, "Switched to second charging stage.");
++ goto restart;
++ }
++ /* Float voltage not reached, yet.
++ * Try to get the requested constant current. */
++ requested_current = get_stage1_charge_current(c);
++ if (current_mA < 0)
++ current_mA = 0;
++ current_diff = requested_current - current_mA;
++ if (abs(requested_current - current_mA) > CURRENT_HYST) {
++ if (current_diff > 0) {
++ /* Increase current */
++ permille = current_diff * 1000 / requested_current;
++ permille /= 2;
++ err = lipocharge_increase_current(c, permille);
++ if (err)
++ return err;
++ } else {
++ /* Decrease current */
++ permille = (-current_diff) * 1000 / requested_current;
++ permille /= 2;
++ err = lipocharge_decrease_current(c, permille);
++ if (err)
++ return err;
++ }
++ }
++ break;
++ case LIPO_SECOND_STAGE: /* Constant voltage */
++ //TODO
++ break;
++ }
++
++ return 0;
++}
+--- /dev/null
++++ b/drivers/cbus/lipocharge.h
+@@ -0,0 +1,60 @@
++#ifndef LIPOCHARGE_H_
++#define LIPOCHARGE_H_
++
++#include <linux/types.h>
++#include <linux/device.h>
++
++
++#define LIPORATE(a,b) (((a) * 1000) + ((b) * 100))
++#define LIPORATE_p6C LIPORATE(0,6) /* 0.6C */
++
++enum lipocharge_state {
++ LIPO_IDLE = 0, /* Not charging */
++ LIPO_FIRST_STAGE, /* Charging: constant current */
++ LIPO_SECOND_STAGE, /* Charging: constant voltage */
++};
++
++/** struct lipocharge - A generic LIPO charger
++ *
++ * @capacity: Battery capacity in mAh.
++ * @rate: Charge rate.
++ * @top_voltage: Fully charged voltage, in mV.
++ * @duty_cycle_max: Max value for duty_cycle.
++ *
++ * @set_charge_current: Set the charge current PWM duty cycle.
++ * @emergency: Something went wrong. Force shutdown.
++ */
++struct lipocharge {
++ unsigned int capacity;
++ unsigned int rate;
++ unsigned int top_voltage;
++ unsigned int duty_cycle_max;
++
++ int (*set_current_pwm)(struct lipocharge *c, unsigned int duty_cycle);
++ void (*emergency)(struct lipocharge *c);
++
++ /* internal */
++ struct device *dev;
++ enum lipocharge_state state;
++ unsigned int active_duty_cycle;
++
++ //TODO implement timer to cut power after maximum charge time.
++};
++
++void lipocharge_init(struct lipocharge *c, struct device *dev);
++void lipocharge_exit(struct lipocharge *c);
++
++int lipocharge_start(struct lipocharge *c);
++void lipocharge_stop(struct lipocharge *c);
++
++int lipocharge_update_state(struct lipocharge *c,
++ unsigned int voltage_mV,
++ int current_mA,
++ unsigned int temp_K);
++
++static inline bool lipocharge_is_charging(struct lipocharge *c)
++{
++ return (c->state != LIPO_IDLE);
++}
++
++#endif /* LIPOCHARGE_H_ */
+--- a/drivers/cbus/cbus.c
++++ b/drivers/cbus/cbus.c
+@@ -36,6 +36,7 @@
+ #include <linux/gpio.h>
+ #include <linux/platform_device.h>
+ #include <linux/platform_data/cbus.h>
++#include <linux/reboot.h>
+
+ #include "cbus.h"
+
+@@ -326,6 +327,13 @@ static void __exit cbus_bus_exit(void)
+ }
+ module_exit(cbus_bus_exit);
+
++void cbus_emergency(void)
++{
++ machine_power_off();
++ panic("cbus: Failed to halt machine in emergency state\n");
++}
++EXPORT_SYMBOL(cbus_emergency);
++
+ MODULE_DESCRIPTION("CBUS serial protocol");
+ MODULE_LICENSE("GPL");
+ MODULE_AUTHOR("Juha Yrjölä");
+--- a/drivers/cbus/cbus.h
++++ b/drivers/cbus/cbus.h
+@@ -27,4 +27,6 @@ extern int cbus_read_reg(struct device *
+ extern int cbus_write_reg(struct device *, unsigned dev, unsigned reg,
+ unsigned val);
+
++void cbus_emergency(void) __noreturn;
++
+ #endif /* __DRIVERS_CBUS_CBUS_H */
+--- a/drivers/cbus/retu.c
++++ b/drivers/cbus/retu.c
+@@ -399,6 +399,11 @@ static int retu_allocate_children(struct
+ if (!child)
+ return -ENOMEM;
+
++ child = retu_allocate_child("retu-n810bm", parent, irq_base,
++ RETU_INT_ADCS, -1, 1);
++ if (!child)
++ return -ENOMEM;
++
+ return 0;
+ }
+
+--- a/drivers/cbus/tahvo.c
++++ b/drivers/cbus/tahvo.c
+@@ -129,6 +129,7 @@ void tahvo_set_clear_reg_bits(struct dev
+ __tahvo_write_reg(tahvo, reg, w);
+ mutex_unlock(&tahvo->mutex);
+ }
++EXPORT_SYMBOL(tahvo_set_clear_reg_bits);
+
+ static irqreturn_t tahvo_irq_handler(int irq, void *_tahvo)
+ {
+@@ -292,6 +293,11 @@ static int tahvo_allocate_children(struc
+ if (!child)
+ return -ENOMEM;
+
++ child = tahvo_allocate_child("tahvo-n810bm", parent,
++ irq_base + TAHVO_INT_BATCURR);
++ if (!child)
++ return -ENOMEM;
++
+ return 0;
+ }
+
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-16 14:23:46 +0000