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-rw-r--r--drivers/power/supply/twl4030_charger.c1149
1 files changed, 1149 insertions, 0 deletions
diff --git a/drivers/power/supply/twl4030_charger.c b/drivers/power/supply/twl4030_charger.c
new file mode 100644
index 0000000000..e78d061d8d
--- /dev/null
+++ b/drivers/power/supply/twl4030_charger.c
@@ -0,0 +1,1149 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * TWL4030/TPS65950 BCI (Battery Charger Interface) driver
+ *
+ * Copyright (C) 2010 Gražvydas Ignotas <notasas@gmail.com>
+ *
+ * based on twl4030_bci_battery.c by TI
+ * Copyright (C) 2008 Texas Instruments, Inc.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <linux/mfd/twl.h>
+#include <linux/power_supply.h>
+#include <linux/notifier.h>
+#include <linux/usb/otg.h>
+#include <linux/iio/consumer.h>
+
+#define TWL4030_BCIMDEN 0x00
+#define TWL4030_BCIMDKEY 0x01
+#define TWL4030_BCIMSTATEC 0x02
+#define TWL4030_BCIICHG 0x08
+#define TWL4030_BCIVAC 0x0a
+#define TWL4030_BCIVBUS 0x0c
+#define TWL4030_BCIMFSTS3 0x0F
+#define TWL4030_BCIMFSTS4 0x10
+#define TWL4030_BCICTL1 0x23
+#define TWL4030_BB_CFG 0x12
+#define TWL4030_BCIIREF1 0x27
+#define TWL4030_BCIIREF2 0x28
+#define TWL4030_BCIMFKEY 0x11
+#define TWL4030_BCIMFEN3 0x14
+#define TWL4030_BCIMFTH8 0x1d
+#define TWL4030_BCIMFTH9 0x1e
+#define TWL4030_BCIWDKEY 0x21
+
+#define TWL4030_BCIMFSTS1 0x01
+
+#define TWL4030_BCIAUTOWEN BIT(5)
+#define TWL4030_CONFIG_DONE BIT(4)
+#define TWL4030_CVENAC BIT(2)
+#define TWL4030_BCIAUTOUSB BIT(1)
+#define TWL4030_BCIAUTOAC BIT(0)
+#define TWL4030_CGAIN BIT(5)
+#define TWL4030_USBFASTMCHG BIT(2)
+#define TWL4030_STS_VBUS BIT(7)
+#define TWL4030_STS_USB_ID BIT(2)
+#define TWL4030_BBCHEN BIT(4)
+#define TWL4030_BBSEL_MASK 0x0c
+#define TWL4030_BBSEL_2V5 0x00
+#define TWL4030_BBSEL_3V0 0x04
+#define TWL4030_BBSEL_3V1 0x08
+#define TWL4030_BBSEL_3V2 0x0c
+#define TWL4030_BBISEL_MASK 0x03
+#define TWL4030_BBISEL_25uA 0x00
+#define TWL4030_BBISEL_150uA 0x01
+#define TWL4030_BBISEL_500uA 0x02
+#define TWL4030_BBISEL_1000uA 0x03
+
+#define TWL4030_BATSTSPCHG BIT(2)
+#define TWL4030_BATSTSMCHG BIT(6)
+
+/* BCI interrupts */
+#define TWL4030_WOVF BIT(0) /* Watchdog overflow */
+#define TWL4030_TMOVF BIT(1) /* Timer overflow */
+#define TWL4030_ICHGHIGH BIT(2) /* Battery charge current high */
+#define TWL4030_ICHGLOW BIT(3) /* Battery cc. low / FSM state change */
+#define TWL4030_ICHGEOC BIT(4) /* Battery current end-of-charge */
+#define TWL4030_TBATOR2 BIT(5) /* Battery temperature out of range 2 */
+#define TWL4030_TBATOR1 BIT(6) /* Battery temperature out of range 1 */
+#define TWL4030_BATSTS BIT(7) /* Battery status */
+
+#define TWL4030_VBATLVL BIT(0) /* VBAT level */
+#define TWL4030_VBATOV BIT(1) /* VBAT overvoltage */
+#define TWL4030_VBUSOV BIT(2) /* VBUS overvoltage */
+#define TWL4030_ACCHGOV BIT(3) /* Ac charger overvoltage */
+
+#define TWL4030_MSTATEC_USB BIT(4)
+#define TWL4030_MSTATEC_AC BIT(5)
+#define TWL4030_MSTATEC_MASK 0x0f
+#define TWL4030_MSTATEC_QUICK1 0x02
+#define TWL4030_MSTATEC_QUICK7 0x07
+#define TWL4030_MSTATEC_COMPLETE1 0x0b
+#define TWL4030_MSTATEC_COMPLETE4 0x0e
+
+/*
+ * If AC (Accessory Charger) voltage exceeds 4.5V (MADC 11)
+ * then AC is available.
+ */
+static inline int ac_available(struct iio_channel *channel_vac)
+{
+ int val, err;
+
+ if (!channel_vac)
+ return 0;
+
+ err = iio_read_channel_processed(channel_vac, &val);
+ if (err < 0)
+ return 0;
+ return val > 4500;
+}
+
+static bool allow_usb;
+module_param(allow_usb, bool, 0644);
+MODULE_PARM_DESC(allow_usb, "Allow USB charge drawing default current");
+
+struct twl4030_bci {
+ struct device *dev;
+ struct power_supply *ac;
+ struct power_supply *usb;
+ struct usb_phy *transceiver;
+ struct notifier_block usb_nb;
+ struct work_struct work;
+ int irq_chg;
+ int irq_bci;
+ int usb_enabled;
+
+ /*
+ * ichg_* and *_cur values in uA. If any are 'large', we set
+ * CGAIN to '1' which doubles the range for half the
+ * precision.
+ */
+ unsigned int ichg_eoc, ichg_lo, ichg_hi;
+ unsigned int usb_cur, ac_cur;
+ struct iio_channel *channel_vac;
+ bool ac_is_active;
+ int usb_mode, ac_mode; /* charging mode requested */
+#define CHARGE_OFF 0
+#define CHARGE_AUTO 1
+#define CHARGE_LINEAR 2
+
+ /* When setting the USB current we slowly increase the
+ * requested current until target is reached or the voltage
+ * drops below 4.75V. In the latter case we step back one
+ * step.
+ */
+ unsigned int usb_cur_target;
+ struct delayed_work current_worker;
+#define USB_CUR_STEP 20000 /* 20mA at a time */
+#define USB_MIN_VOLT 4750000 /* 4.75V */
+#define USB_CUR_DELAY msecs_to_jiffies(100)
+#define USB_MAX_CURRENT 1700000 /* TWL4030 caps at 1.7A */
+
+ unsigned long event;
+};
+
+/* strings for 'usb_mode' values */
+static const char *modes[] = { "off", "auto", "continuous" };
+
+/*
+ * clear and set bits on an given register on a given module
+ */
+static int twl4030_clear_set(u8 mod_no, u8 clear, u8 set, u8 reg)
+{
+ u8 val = 0;
+ int ret;
+
+ ret = twl_i2c_read_u8(mod_no, &val, reg);
+ if (ret)
+ return ret;
+
+ val &= ~clear;
+ val |= set;
+
+ return twl_i2c_write_u8(mod_no, val, reg);
+}
+
+static int twl4030_bci_read(u8 reg, u8 *val)
+{
+ return twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, val, reg);
+}
+
+static int twl4030_clear_set_boot_bci(u8 clear, u8 set)
+{
+ return twl4030_clear_set(TWL_MODULE_PM_MASTER, clear,
+ TWL4030_CONFIG_DONE | TWL4030_BCIAUTOWEN | set,
+ TWL4030_PM_MASTER_BOOT_BCI);
+}
+
+static int twl4030bci_read_adc_val(u8 reg)
+{
+ int ret, temp;
+ u8 val;
+
+ /* read MSB */
+ ret = twl4030_bci_read(reg + 1, &val);
+ if (ret)
+ return ret;
+
+ temp = (int)(val & 0x03) << 8;
+
+ /* read LSB */
+ ret = twl4030_bci_read(reg, &val);
+ if (ret)
+ return ret;
+
+ return temp | val;
+}
+
+/*
+ * TI provided formulas:
+ * CGAIN == 0: ICHG = (BCIICHG * 1.7) / (2^10 - 1) - 0.85
+ * CGAIN == 1: ICHG = (BCIICHG * 3.4) / (2^10 - 1) - 1.7
+ * Here we use integer approximation of:
+ * CGAIN == 0: val * 1.6618 - 0.85 * 1000
+ * CGAIN == 1: (val * 1.6618 - 0.85 * 1000) * 2
+ */
+/*
+ * convert twl register value for currents into uA
+ */
+static int regval2ua(int regval, bool cgain)
+{
+ if (cgain)
+ return (regval * 16618 - 8500 * 1000) / 5;
+ else
+ return (regval * 16618 - 8500 * 1000) / 10;
+}
+
+/*
+ * convert uA currents into twl register value
+ */
+static int ua2regval(int ua, bool cgain)
+{
+ int ret;
+ if (cgain)
+ ua /= 2;
+ ret = (ua * 10 + 8500 * 1000) / 16618;
+ /* rounding problems */
+ if (ret < 512)
+ ret = 512;
+ return ret;
+}
+
+static int twl4030_charger_update_current(struct twl4030_bci *bci)
+{
+ int status;
+ int cur;
+ unsigned reg, cur_reg;
+ u8 bcictl1, oldreg, fullreg;
+ bool cgain = false;
+ u8 boot_bci;
+
+ /*
+ * If AC (Accessory Charger) voltage exceeds 4.5V (MADC 11)
+ * and AC is enabled, set current for 'ac'
+ */
+ if (ac_available(bci->channel_vac)) {
+ cur = bci->ac_cur;
+ bci->ac_is_active = true;
+ } else {
+ cur = bci->usb_cur;
+ bci->ac_is_active = false;
+ if (cur > bci->usb_cur_target) {
+ cur = bci->usb_cur_target;
+ bci->usb_cur = cur;
+ }
+ if (cur < bci->usb_cur_target)
+ schedule_delayed_work(&bci->current_worker, USB_CUR_DELAY);
+ }
+
+ /* First, check thresholds and see if cgain is needed */
+ if (bci->ichg_eoc >= 200000)
+ cgain = true;
+ if (bci->ichg_lo >= 400000)
+ cgain = true;
+ if (bci->ichg_hi >= 820000)
+ cgain = true;
+ if (cur > 852000)
+ cgain = true;
+
+ status = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
+ if (status < 0)
+ return status;
+ if (twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &boot_bci,
+ TWL4030_PM_MASTER_BOOT_BCI) < 0)
+ boot_bci = 0;
+ boot_bci &= 7;
+
+ if ((!!cgain) != !!(bcictl1 & TWL4030_CGAIN))
+ /* Need to turn for charging while we change the
+ * CGAIN bit. Leave it off while everything is
+ * updated.
+ */
+ twl4030_clear_set_boot_bci(boot_bci, 0);
+
+ /*
+ * For ichg_eoc, the hardware only supports reg values matching
+ * 100XXXX000, and requires the XXXX be stored in the high nibble
+ * of TWL4030_BCIMFTH8.
+ */
+ reg = ua2regval(bci->ichg_eoc, cgain);
+ if (reg > 0x278)
+ reg = 0x278;
+ if (reg < 0x200)
+ reg = 0x200;
+ reg = (reg >> 3) & 0xf;
+ fullreg = reg << 4;
+
+ /*
+ * For ichg_lo, reg value must match 10XXXX0000.
+ * XXXX is stored in low nibble of TWL4030_BCIMFTH8.
+ */
+ reg = ua2regval(bci->ichg_lo, cgain);
+ if (reg > 0x2F0)
+ reg = 0x2F0;
+ if (reg < 0x200)
+ reg = 0x200;
+ reg = (reg >> 4) & 0xf;
+ fullreg |= reg;
+
+ /* ichg_eoc and ichg_lo live in same register */
+ status = twl4030_bci_read(TWL4030_BCIMFTH8, &oldreg);
+ if (status < 0)
+ return status;
+ if (oldreg != fullreg) {
+ status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xF4,
+ TWL4030_BCIMFKEY);
+ if (status < 0)
+ return status;
+ twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
+ fullreg, TWL4030_BCIMFTH8);
+ }
+
+ /* ichg_hi threshold must be 1XXXX01100 (I think) */
+ reg = ua2regval(bci->ichg_hi, cgain);
+ if (reg > 0x3E0)
+ reg = 0x3E0;
+ if (reg < 0x200)
+ reg = 0x200;
+ fullreg = (reg >> 5) & 0xF;
+ fullreg <<= 4;
+ status = twl4030_bci_read(TWL4030_BCIMFTH9, &oldreg);
+ if (status < 0)
+ return status;
+ if ((oldreg & 0xF0) != fullreg) {
+ fullreg |= (oldreg & 0x0F);
+ status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7,
+ TWL4030_BCIMFKEY);
+ if (status < 0)
+ return status;
+ twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
+ fullreg, TWL4030_BCIMFTH9);
+ }
+
+ /*
+ * And finally, set the current. This is stored in
+ * two registers.
+ */
+ reg = ua2regval(cur, cgain);
+ /* we have only 10 bits */
+ if (reg > 0x3ff)
+ reg = 0x3ff;
+ status = twl4030_bci_read(TWL4030_BCIIREF1, &oldreg);
+ if (status < 0)
+ return status;
+ cur_reg = oldreg;
+ status = twl4030_bci_read(TWL4030_BCIIREF2, &oldreg);
+ if (status < 0)
+ return status;
+ cur_reg |= oldreg << 8;
+ if (reg != oldreg) {
+ /* disable write protection for one write access for
+ * BCIIREF */
+ status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7,
+ TWL4030_BCIMFKEY);
+ if (status < 0)
+ return status;
+ status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
+ (reg & 0x100) ? 3 : 2,
+ TWL4030_BCIIREF2);
+ if (status < 0)
+ return status;
+ /* disable write protection for one write access for
+ * BCIIREF */
+ status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7,
+ TWL4030_BCIMFKEY);
+ if (status < 0)
+ return status;
+ status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
+ reg & 0xff,
+ TWL4030_BCIIREF1);
+ }
+ if ((!!cgain) != !!(bcictl1 & TWL4030_CGAIN)) {
+ /* Flip CGAIN and re-enable charging */
+ bcictl1 ^= TWL4030_CGAIN;
+ twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
+ bcictl1, TWL4030_BCICTL1);
+ twl4030_clear_set_boot_bci(0, boot_bci);
+ }
+ return 0;
+}
+
+static int twl4030_charger_get_current(void);
+
+static void twl4030_current_worker(struct work_struct *data)
+{
+ int v, curr;
+ int res;
+ struct twl4030_bci *bci = container_of(data, struct twl4030_bci,
+ current_worker.work);
+
+ res = twl4030bci_read_adc_val(TWL4030_BCIVBUS);
+ if (res < 0)
+ v = 0;
+ else
+ /* BCIVBUS uses ADCIN8, 7/1023 V/step */
+ v = res * 6843;
+ curr = twl4030_charger_get_current();
+
+ dev_dbg(bci->dev, "v=%d cur=%d limit=%d target=%d\n", v, curr,
+ bci->usb_cur, bci->usb_cur_target);
+
+ if (v < USB_MIN_VOLT) {
+ /* Back up and stop adjusting. */
+ if (bci->usb_cur >= USB_CUR_STEP)
+ bci->usb_cur -= USB_CUR_STEP;
+ bci->usb_cur_target = bci->usb_cur;
+ } else if (bci->usb_cur >= bci->usb_cur_target ||
+ bci->usb_cur + USB_CUR_STEP > USB_MAX_CURRENT) {
+ /* Reached target and voltage is OK - stop */
+ return;
+ } else {
+ bci->usb_cur += USB_CUR_STEP;
+ schedule_delayed_work(&bci->current_worker, USB_CUR_DELAY);
+ }
+ twl4030_charger_update_current(bci);
+}
+
+/*
+ * Enable/Disable USB Charge functionality.
+ */
+static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
+{
+ int ret;
+ u32 reg;
+
+ if (bci->usb_mode == CHARGE_OFF)
+ enable = false;
+ if (enable && !IS_ERR_OR_NULL(bci->transceiver)) {
+
+ twl4030_charger_update_current(bci);
+
+ /* Need to keep phy powered */
+ if (!bci->usb_enabled) {
+ pm_runtime_get_sync(bci->transceiver->dev);
+ bci->usb_enabled = 1;
+ }
+
+ if (bci->usb_mode == CHARGE_AUTO) {
+ /* Enable interrupts now. */
+ reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_ICHGEOC |
+ TWL4030_TBATOR2 | TWL4030_TBATOR1 |
+ TWL4030_BATSTS);
+ ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
+ TWL4030_INTERRUPTS_BCIIMR1A);
+ if (ret < 0) {
+ dev_err(bci->dev,
+ "failed to unmask interrupts: %d\n",
+ ret);
+ return ret;
+ }
+ /* forcing the field BCIAUTOUSB (BOOT_BCI[1]) to 1 */
+ ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOUSB);
+ }
+
+ /* forcing USBFASTMCHG(BCIMFSTS4[2]) to 1 */
+ ret = twl4030_clear_set(TWL_MODULE_MAIN_CHARGE, 0,
+ TWL4030_USBFASTMCHG, TWL4030_BCIMFSTS4);
+ if (bci->usb_mode == CHARGE_LINEAR) {
+ /* Enable interrupts now. */
+ reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_TBATOR2 |
+ TWL4030_TBATOR1 | TWL4030_BATSTS);
+ ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
+ TWL4030_INTERRUPTS_BCIIMR1A);
+ if (ret < 0) {
+ dev_err(bci->dev,
+ "failed to unmask interrupts: %d\n",
+ ret);
+ return ret;
+ }
+ twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC|TWL4030_CVENAC, 0);
+ /* Watch dog key: WOVF acknowledge */
+ ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x33,
+ TWL4030_BCIWDKEY);
+ /* 0x24 + EKEY6: off mode */
+ ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x2a,
+ TWL4030_BCIMDKEY);
+ /* EKEY2: Linear charge: USB path */
+ ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x26,
+ TWL4030_BCIMDKEY);
+ /* WDKEY5: stop watchdog count */
+ ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xf3,
+ TWL4030_BCIWDKEY);
+ /* enable MFEN3 access */
+ ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x9c,
+ TWL4030_BCIMFKEY);
+ /* ICHGEOCEN - end-of-charge monitor (current < 80mA)
+ * (charging continues)
+ * ICHGLOWEN - current level monitor (charge continues)
+ * don't monitor over-current or heat save
+ */
+ ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xf0,
+ TWL4030_BCIMFEN3);
+ }
+ } else {
+ ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 0);
+ ret |= twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x2a,
+ TWL4030_BCIMDKEY);
+ if (bci->usb_enabled) {
+ pm_runtime_mark_last_busy(bci->transceiver->dev);
+ pm_runtime_put_autosuspend(bci->transceiver->dev);
+ bci->usb_enabled = 0;
+ }
+ bci->usb_cur = 0;
+ }
+
+ return ret;
+}
+
+/*
+ * Enable/Disable AC Charge funtionality.
+ */
+static int twl4030_charger_enable_ac(struct twl4030_bci *bci, bool enable)
+{
+ int ret;
+
+ if (bci->ac_mode == CHARGE_OFF)
+ enable = false;
+
+ if (enable)
+ ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOAC);
+ else
+ ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC, 0);
+
+ return ret;
+}
+
+/*
+ * Enable/Disable charging of Backup Battery.
+ */
+static int twl4030_charger_enable_backup(int uvolt, int uamp)
+{
+ int ret;
+ u8 flags;
+
+ if (uvolt < 2500000 ||
+ uamp < 25) {
+ /* disable charging of backup battery */
+ ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER,
+ TWL4030_BBCHEN, 0, TWL4030_BB_CFG);
+ return ret;
+ }
+
+ flags = TWL4030_BBCHEN;
+ if (uvolt >= 3200000)
+ flags |= TWL4030_BBSEL_3V2;
+ else if (uvolt >= 3100000)
+ flags |= TWL4030_BBSEL_3V1;
+ else if (uvolt >= 3000000)
+ flags |= TWL4030_BBSEL_3V0;
+ else
+ flags |= TWL4030_BBSEL_2V5;
+
+ if (uamp >= 1000)
+ flags |= TWL4030_BBISEL_1000uA;
+ else if (uamp >= 500)
+ flags |= TWL4030_BBISEL_500uA;
+ else if (uamp >= 150)
+ flags |= TWL4030_BBISEL_150uA;
+ else
+ flags |= TWL4030_BBISEL_25uA;
+
+ ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER,
+ TWL4030_BBSEL_MASK | TWL4030_BBISEL_MASK,
+ flags,
+ TWL4030_BB_CFG);
+
+ return ret;
+}
+
+/*
+ * TWL4030 CHG_PRES (AC charger presence) events
+ */
+static irqreturn_t twl4030_charger_interrupt(int irq, void *arg)
+{
+ struct twl4030_bci *bci = arg;
+
+ dev_dbg(bci->dev, "CHG_PRES irq\n");
+ /* reset current on each 'plug' event */
+ bci->ac_cur = 500000;
+ twl4030_charger_update_current(bci);
+ power_supply_changed(bci->ac);
+ power_supply_changed(bci->usb);
+
+ return IRQ_HANDLED;
+}
+
+/*
+ * TWL4030 BCI monitoring events
+ */
+static irqreturn_t twl4030_bci_interrupt(int irq, void *arg)
+{
+ struct twl4030_bci *bci = arg;
+ u8 irqs1, irqs2;
+ int ret;
+
+ ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs1,
+ TWL4030_INTERRUPTS_BCIISR1A);
+ if (ret < 0)
+ return IRQ_HANDLED;
+
+ ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs2,
+ TWL4030_INTERRUPTS_BCIISR2A);
+ if (ret < 0)
+ return IRQ_HANDLED;
+
+ dev_dbg(bci->dev, "BCI irq %02x %02x\n", irqs2, irqs1);
+
+ if (irqs1 & (TWL4030_ICHGLOW | TWL4030_ICHGEOC)) {
+ /* charger state change, inform the core */
+ power_supply_changed(bci->ac);
+ power_supply_changed(bci->usb);
+ }
+ twl4030_charger_update_current(bci);
+
+ /* various monitoring events, for now we just log them here */
+ if (irqs1 & (TWL4030_TBATOR2 | TWL4030_TBATOR1))
+ dev_warn(bci->dev, "battery temperature out of range\n");
+
+ if (irqs1 & TWL4030_BATSTS)
+ dev_crit(bci->dev, "battery disconnected\n");
+
+ if (irqs2 & TWL4030_VBATOV)
+ dev_crit(bci->dev, "VBAT overvoltage\n");
+
+ if (irqs2 & TWL4030_VBUSOV)
+ dev_crit(bci->dev, "VBUS overvoltage\n");
+
+ if (irqs2 & TWL4030_ACCHGOV)
+ dev_crit(bci->dev, "Ac charger overvoltage\n");
+
+ return IRQ_HANDLED;
+}
+
+static void twl4030_bci_usb_work(struct work_struct *data)
+{
+ struct twl4030_bci *bci = container_of(data, struct twl4030_bci, work);
+
+ switch (bci->event) {
+ case USB_EVENT_VBUS:
+ case USB_EVENT_CHARGER:
+ twl4030_charger_enable_usb(bci, true);
+ break;
+ case USB_EVENT_NONE:
+ twl4030_charger_enable_usb(bci, false);
+ break;
+ }
+}
+
+static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val,
+ void *priv)
+{
+ struct twl4030_bci *bci = container_of(nb, struct twl4030_bci, usb_nb);
+
+ dev_dbg(bci->dev, "OTG notify %lu\n", val);
+
+ /* reset current on each 'plug' event */
+ if (allow_usb)
+ bci->usb_cur_target = 500000;
+ else
+ bci->usb_cur_target = 100000;
+
+ bci->event = val;
+ schedule_work(&bci->work);
+
+ return NOTIFY_OK;
+}
+
+/*
+ * sysfs charger enabled store
+ */
+static ssize_t
+twl4030_bci_mode_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t n)
+{
+ struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
+ int mode;
+ int status;
+
+ mode = sysfs_match_string(modes, buf);
+ if (mode < 0)
+ return mode;
+
+ if (dev == &bci->ac->dev) {
+ if (mode == 2)
+ return -EINVAL;
+ twl4030_charger_enable_ac(bci, false);
+ bci->ac_mode = mode;
+ status = twl4030_charger_enable_ac(bci, true);
+ } else {
+ twl4030_charger_enable_usb(bci, false);
+ bci->usb_mode = mode;
+ status = twl4030_charger_enable_usb(bci, true);
+ }
+ return (status == 0) ? n : status;
+}
+
+/*
+ * sysfs charger enabled show
+ */
+static ssize_t
+twl4030_bci_mode_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
+ int len = 0;
+ int i;
+ int mode = bci->usb_mode;
+
+ if (dev == &bci->ac->dev)
+ mode = bci->ac_mode;
+
+ for (i = 0; i < ARRAY_SIZE(modes); i++)
+ if (mode == i)
+ len += sysfs_emit_at(buf, len, "[%s] ", modes[i]);
+ else
+ len += sysfs_emit_at(buf, len, "%s ", modes[i]);
+ buf[len-1] = '\n';
+ return len;
+}
+static DEVICE_ATTR(mode, 0644, twl4030_bci_mode_show,
+ twl4030_bci_mode_store);
+
+static int twl4030_charger_get_current(void)
+{
+ int curr;
+ int ret;
+ u8 bcictl1;
+
+ curr = twl4030bci_read_adc_val(TWL4030_BCIICHG);
+ if (curr < 0)
+ return curr;
+
+ ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
+ if (ret)
+ return ret;
+
+ return regval2ua(curr, bcictl1 & TWL4030_CGAIN);
+}
+
+/*
+ * Returns the main charge FSM state
+ * Or < 0 on failure.
+ */
+static int twl4030bci_state(struct twl4030_bci *bci)
+{
+ int ret;
+ u8 state;
+
+ ret = twl4030_bci_read(TWL4030_BCIMSTATEC, &state);
+ if (ret) {
+ dev_err(bci->dev, "error reading BCIMSTATEC\n");
+ return ret;
+ }
+
+ dev_dbg(bci->dev, "state: %02x\n", state);
+
+ return state;
+}
+
+static int twl4030_bci_state_to_status(int state)
+{
+ state &= TWL4030_MSTATEC_MASK;
+ if (TWL4030_MSTATEC_QUICK1 <= state && state <= TWL4030_MSTATEC_QUICK7)
+ return POWER_SUPPLY_STATUS_CHARGING;
+ else if (TWL4030_MSTATEC_COMPLETE1 <= state &&
+ state <= TWL4030_MSTATEC_COMPLETE4)
+ return POWER_SUPPLY_STATUS_FULL;
+ else
+ return POWER_SUPPLY_STATUS_NOT_CHARGING;
+}
+
+static int twl4030_bci_get_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ struct twl4030_bci *bci = dev_get_drvdata(psy->dev.parent);
+ int is_charging;
+ int state;
+ int ret;
+
+ state = twl4030bci_state(bci);
+ if (state < 0)
+ return state;
+
+ if (psy->desc->type == POWER_SUPPLY_TYPE_USB)
+ is_charging = state & TWL4030_MSTATEC_USB;
+ else
+ is_charging = state & TWL4030_MSTATEC_AC;
+ if (!is_charging) {
+ u8 s;
+ ret = twl4030_bci_read(TWL4030_BCIMDEN, &s);
+ if (ret < 0)
+ return ret;
+ if (psy->desc->type == POWER_SUPPLY_TYPE_USB)
+ is_charging = s & 1;
+ else
+ is_charging = s & 2;
+ if (is_charging)
+ /* A little white lie */
+ state = TWL4030_MSTATEC_QUICK1;
+ }
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_STATUS:
+ if (is_charging)
+ val->intval = twl4030_bci_state_to_status(state);
+ else
+ val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+ /* charging must be active for meaningful result */
+ if (!is_charging)
+ return -ENODATA;
+ if (psy->desc->type == POWER_SUPPLY_TYPE_USB) {
+ ret = twl4030bci_read_adc_val(TWL4030_BCIVBUS);
+ if (ret < 0)
+ return ret;
+ /* BCIVBUS uses ADCIN8, 7/1023 V/step */
+ val->intval = ret * 6843;
+ } else {
+ ret = twl4030bci_read_adc_val(TWL4030_BCIVAC);
+ if (ret < 0)
+ return ret;
+ /* BCIVAC uses ADCIN11, 10/1023 V/step */
+ val->intval = ret * 9775;
+ }
+ break;
+ case POWER_SUPPLY_PROP_CURRENT_NOW:
+ if (!is_charging)
+ return -ENODATA;
+ /* current measurement is shared between AC and USB */
+ ret = twl4030_charger_get_current();
+ if (ret < 0)
+ return ret;
+ val->intval = ret;
+ break;
+ case POWER_SUPPLY_PROP_ONLINE:
+ val->intval = is_charging &&
+ twl4030_bci_state_to_status(state) !=
+ POWER_SUPPLY_STATUS_NOT_CHARGING;
+ break;
+ case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
+ val->intval = -1;
+ if (psy->desc->type != POWER_SUPPLY_TYPE_USB) {
+ if (!bci->ac_is_active)
+ val->intval = bci->ac_cur;
+ } else {
+ if (bci->ac_is_active)
+ val->intval = bci->usb_cur_target;
+ }
+ if (val->intval < 0) {
+ u8 bcictl1;
+
+ val->intval = twl4030bci_read_adc_val(TWL4030_BCIIREF1);
+ if (val->intval < 0)
+ return val->intval;
+ ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
+ if (ret < 0)
+ return ret;
+ val->intval = regval2ua(val->intval, bcictl1 &
+ TWL4030_CGAIN);
+ }
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int twl4030_bci_set_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ const union power_supply_propval *val)
+{
+ struct twl4030_bci *bci = dev_get_drvdata(psy->dev.parent);
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
+ if (psy->desc->type == POWER_SUPPLY_TYPE_USB)
+ bci->usb_cur_target = val->intval;
+ else
+ bci->ac_cur = val->intval;
+ twl4030_charger_update_current(bci);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int twl4030_bci_property_is_writeable(struct power_supply *psy,
+ enum power_supply_property psp)
+{
+ switch (psp) {
+ case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static enum power_supply_property twl4030_charger_props[] = {
+ POWER_SUPPLY_PROP_STATUS,
+ POWER_SUPPLY_PROP_ONLINE,
+ POWER_SUPPLY_PROP_VOLTAGE_NOW,
+ POWER_SUPPLY_PROP_CURRENT_NOW,
+ POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
+};
+
+#ifdef CONFIG_OF
+static const struct twl4030_bci_platform_data *
+twl4030_bci_parse_dt(struct device *dev)
+{
+ struct device_node *np = dev->of_node;
+ struct twl4030_bci_platform_data *pdata;
+ u32 num;
+
+ if (!np)
+ return NULL;
+ pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return pdata;
+
+ if (of_property_read_u32(np, "ti,bb-uvolt", &num) == 0)
+ pdata->bb_uvolt = num;
+ if (of_property_read_u32(np, "ti,bb-uamp", &num) == 0)
+ pdata->bb_uamp = num;
+ return pdata;
+}
+#else
+static inline const struct twl4030_bci_platform_data *
+twl4030_bci_parse_dt(struct device *dev)
+{
+ return NULL;
+}
+#endif
+
+static const struct power_supply_desc twl4030_bci_ac_desc = {
+ .name = "twl4030_ac",
+ .type = POWER_SUPPLY_TYPE_MAINS,
+ .properties = twl4030_charger_props,
+ .num_properties = ARRAY_SIZE(twl4030_charger_props),
+ .get_property = twl4030_bci_get_property,
+ .set_property = twl4030_bci_set_property,
+ .property_is_writeable = twl4030_bci_property_is_writeable,
+};
+
+static const struct power_supply_desc twl4030_bci_usb_desc = {
+ .name = "twl4030_usb",
+ .type = POWER_SUPPLY_TYPE_USB,
+ .properties = twl4030_charger_props,
+ .num_properties = ARRAY_SIZE(twl4030_charger_props),
+ .get_property = twl4030_bci_get_property,
+ .set_property = twl4030_bci_set_property,
+ .property_is_writeable = twl4030_bci_property_is_writeable,
+};
+
+static int twl4030_bci_probe(struct platform_device *pdev)
+{
+ struct twl4030_bci *bci;
+ const struct twl4030_bci_platform_data *pdata = pdev->dev.platform_data;
+ int ret;
+ u32 reg;
+
+ bci = devm_kzalloc(&pdev->dev, sizeof(*bci), GFP_KERNEL);
+ if (bci == NULL)
+ return -ENOMEM;
+
+ if (!pdata)
+ pdata = twl4030_bci_parse_dt(&pdev->dev);
+
+ bci->ichg_eoc = 80100; /* Stop charging when current drops to here */
+ bci->ichg_lo = 241000; /* Low threshold */
+ bci->ichg_hi = 500000; /* High threshold */
+ bci->ac_cur = 500000; /* 500mA */
+ if (allow_usb)
+ bci->usb_cur_target = 500000; /* 500mA */
+ else
+ bci->usb_cur_target = 100000; /* 100mA */
+ bci->usb_mode = CHARGE_AUTO;
+ bci->ac_mode = CHARGE_AUTO;
+
+ bci->dev = &pdev->dev;
+ bci->irq_chg = platform_get_irq(pdev, 0);
+ bci->irq_bci = platform_get_irq(pdev, 1);
+
+ platform_set_drvdata(pdev, bci);
+
+ INIT_WORK(&bci->work, twl4030_bci_usb_work);
+ INIT_DELAYED_WORK(&bci->current_worker, twl4030_current_worker);
+
+ bci->channel_vac = devm_iio_channel_get(&pdev->dev, "vac");
+ if (IS_ERR(bci->channel_vac)) {
+ ret = PTR_ERR(bci->channel_vac);
+ if (ret == -EPROBE_DEFER)
+ return ret; /* iio not ready */
+ dev_warn(&pdev->dev, "could not request vac iio channel (%d)",
+ ret);
+ bci->channel_vac = NULL;
+ }
+
+ if (bci->dev->of_node) {
+ struct device_node *phynode;
+
+ phynode = of_get_compatible_child(bci->dev->of_node->parent,
+ "ti,twl4030-usb");
+ if (phynode) {
+ bci->usb_nb.notifier_call = twl4030_bci_usb_ncb;
+ bci->transceiver = devm_usb_get_phy_by_node(
+ bci->dev, phynode, &bci->usb_nb);
+ of_node_put(phynode);
+ if (IS_ERR(bci->transceiver)) {
+ ret = PTR_ERR(bci->transceiver);
+ if (ret == -EPROBE_DEFER)
+ return ret; /* phy not ready */
+ dev_warn(&pdev->dev, "could not request transceiver (%d)",
+ ret);
+ bci->transceiver = NULL;
+ }
+ }
+ }
+
+ bci->ac = devm_power_supply_register(&pdev->dev, &twl4030_bci_ac_desc,
+ NULL);
+ if (IS_ERR(bci->ac)) {
+ ret = PTR_ERR(bci->ac);
+ dev_err(&pdev->dev, "failed to register ac: %d\n", ret);
+ return ret;
+ }
+
+ bci->usb = devm_power_supply_register(&pdev->dev, &twl4030_bci_usb_desc,
+ NULL);
+ if (IS_ERR(bci->usb)) {
+ ret = PTR_ERR(bci->usb);
+ dev_err(&pdev->dev, "failed to register usb: %d\n", ret);
+ return ret;
+ }
+
+ ret = devm_request_threaded_irq(&pdev->dev, bci->irq_chg, NULL,
+ twl4030_charger_interrupt, IRQF_ONESHOT, pdev->name,
+ bci);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "could not request irq %d, status %d\n",
+ bci->irq_chg, ret);
+ return ret;
+ }
+
+ ret = devm_request_threaded_irq(&pdev->dev, bci->irq_bci, NULL,
+ twl4030_bci_interrupt, IRQF_ONESHOT, pdev->name, bci);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "could not request irq %d, status %d\n",
+ bci->irq_bci, ret);
+ return ret;
+ }
+
+ /* Enable interrupts now. */
+ reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_ICHGEOC | TWL4030_TBATOR2 |
+ TWL4030_TBATOR1 | TWL4030_BATSTS);
+ ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
+ TWL4030_INTERRUPTS_BCIIMR1A);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
+ return ret;
+ }
+
+ reg = ~(u32)(TWL4030_VBATOV | TWL4030_VBUSOV | TWL4030_ACCHGOV);
+ ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
+ TWL4030_INTERRUPTS_BCIIMR2A);
+ if (ret < 0)
+ dev_warn(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
+
+ twl4030_charger_update_current(bci);
+ if (device_create_file(&bci->usb->dev, &dev_attr_mode))
+ dev_warn(&pdev->dev, "could not create sysfs file\n");
+ if (device_create_file(&bci->ac->dev, &dev_attr_mode))
+ dev_warn(&pdev->dev, "could not create sysfs file\n");
+
+ twl4030_charger_enable_ac(bci, true);
+ if (!IS_ERR_OR_NULL(bci->transceiver))
+ twl4030_bci_usb_ncb(&bci->usb_nb,
+ bci->transceiver->last_event,
+ NULL);
+ else
+ twl4030_charger_enable_usb(bci, false);
+ if (pdata)
+ twl4030_charger_enable_backup(pdata->bb_uvolt,
+ pdata->bb_uamp);
+ else
+ twl4030_charger_enable_backup(0, 0);
+
+ return 0;
+}
+
+static int twl4030_bci_remove(struct platform_device *pdev)
+{
+ struct twl4030_bci *bci = platform_get_drvdata(pdev);
+
+ twl4030_charger_enable_ac(bci, false);
+ twl4030_charger_enable_usb(bci, false);
+ twl4030_charger_enable_backup(0, 0);
+
+ device_remove_file(&bci->usb->dev, &dev_attr_mode);
+ device_remove_file(&bci->ac->dev, &dev_attr_mode);
+ /* mask interrupts */
+ twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
+ TWL4030_INTERRUPTS_BCIIMR1A);
+ twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
+ TWL4030_INTERRUPTS_BCIIMR2A);
+
+ return 0;
+}
+
+static const struct of_device_id twl_bci_of_match[] __maybe_unused = {
+ {.compatible = "ti,twl4030-bci", },
+ { }
+};
+MODULE_DEVICE_TABLE(of, twl_bci_of_match);
+
+static struct platform_driver twl4030_bci_driver = {
+ .probe = twl4030_bci_probe,
+ .remove = twl4030_bci_remove,
+ .driver = {
+ .name = "twl4030_bci",
+ .of_match_table = of_match_ptr(twl_bci_of_match),
+ },
+};
+module_platform_driver(twl4030_bci_driver);
+
+MODULE_AUTHOR("Gražvydas Ignotas");
+MODULE_DESCRIPTION("TWL4030 Battery Charger Interface driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:twl4030_bci");
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-04 16:48:28 +0000