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wifipineapple-openwrt/target/linux/omap24xx/patches-3.3/900-n810-battery-management...

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--- 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 Yrj<72>l<EFBFBD>");
--- 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;
}
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