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@@ -0,0 +1,565 @@
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+/*
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+ * TWL4030/TPS65950 BCI (Battery Charger Interface) driver
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+ *
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+ * Copyright (C) 2010 Gražvydas Ignotas <notasas@gmail.com>
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+ *
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+ * based on twl4030_bci_battery.c by TI
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+ * Copyright (C) 2008 Texas Instruments, Inc.
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation; either version 2 of the License, or
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+ * (at your option) any later version.
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+ */
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+
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+#include <linux/init.h>
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+#include <linux/module.h>
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+#include <linux/slab.h>
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+#include <linux/platform_device.h>
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+#include <linux/interrupt.h>
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+#include <linux/i2c/twl.h>
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+#include <linux/power_supply.h>
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+#include <linux/notifier.h>
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+#include <linux/usb/otg.h>
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+
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+#define TWL4030_BCIMSTATEC 0x02
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+#define TWL4030_BCIICHG 0x08
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+#define TWL4030_BCIVAC 0x0a
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+#define TWL4030_BCIVBUS 0x0c
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+#define TWL4030_BCIMFSTS4 0x10
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+#define TWL4030_BCICTL1 0x23
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+
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+#define TWL4030_BCIAUTOWEN BIT(5)
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+#define TWL4030_CONFIG_DONE BIT(4)
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+#define TWL4030_BCIAUTOUSB BIT(1)
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+#define TWL4030_BCIAUTOAC BIT(0)
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+#define TWL4030_CGAIN BIT(5)
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+#define TWL4030_USBFASTMCHG BIT(2)
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+#define TWL4030_STS_VBUS BIT(7)
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+#define TWL4030_STS_USB_ID BIT(2)
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+
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+/* BCI interrupts */
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+#define TWL4030_WOVF BIT(0) /* Watchdog overflow */
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+#define TWL4030_TMOVF BIT(1) /* Timer overflow */
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+#define TWL4030_ICHGHIGH BIT(2) /* Battery charge current high */
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+#define TWL4030_ICHGLOW BIT(3) /* Battery cc. low / FSM state change */
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+#define TWL4030_ICHGEOC BIT(4) /* Battery current end-of-charge */
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+#define TWL4030_TBATOR2 BIT(5) /* Battery temperature out of range 2 */
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+#define TWL4030_TBATOR1 BIT(6) /* Battery temperature out of range 1 */
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+#define TWL4030_BATSTS BIT(7) /* Battery status */
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+
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+#define TWL4030_VBATLVL BIT(0) /* VBAT level */
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+#define TWL4030_VBATOV BIT(1) /* VBAT overvoltage */
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+#define TWL4030_VBUSOV BIT(2) /* VBUS overvoltage */
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+#define TWL4030_ACCHGOV BIT(3) /* Ac charger overvoltage */
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+
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+#define TWL4030_MSTATEC_USB BIT(4)
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+#define TWL4030_MSTATEC_AC BIT(5)
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+#define TWL4030_MSTATEC_MASK 0x0f
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+#define TWL4030_MSTATEC_QUICK1 0x02
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+#define TWL4030_MSTATEC_QUICK7 0x07
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+#define TWL4030_MSTATEC_COMPLETE1 0x0b
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+#define TWL4030_MSTATEC_COMPLETE4 0x0e
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+
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+static bool allow_usb;
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+module_param(allow_usb, bool, 1);
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+MODULE_PARM_DESC(allow_usb, "Allow USB charge drawing default current");
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+
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+struct twl4030_bci {
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+ struct device *dev;
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+ struct power_supply ac;
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+ struct power_supply usb;
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+ struct otg_transceiver *transceiver;
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+ struct notifier_block otg_nb;
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+ int irq_chg;
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+ int irq_bci;
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+};
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+
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+/*
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+ * clear and set bits on an given register on a given module
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+ */
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+static int twl4030_clear_set(u8 mod_no, u8 clear, u8 set, u8 reg)
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+{
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+ u8 val = 0;
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+ int ret;
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+
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+ ret = twl_i2c_read_u8(mod_no, &val, reg);
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+ if (ret)
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+ return ret;
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+
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+ val &= ~clear;
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+ val |= set;
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+
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+ return twl_i2c_write_u8(mod_no, val, reg);
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+}
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+
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+static int twl4030_bci_read(u8 reg, u8 *val)
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+{
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+ return twl_i2c_read_u8(TWL4030_MODULE_MAIN_CHARGE, val, reg);
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+}
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+
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+static int twl4030_clear_set_boot_bci(u8 clear, u8 set)
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+{
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+ return twl4030_clear_set(TWL4030_MODULE_PM_MASTER, 0,
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+ TWL4030_CONFIG_DONE | TWL4030_BCIAUTOWEN | set,
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+ TWL4030_PM_MASTER_BOOT_BCI);
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+}
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+
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+static int twl4030bci_read_adc_val(u8 reg)
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+{
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+ int ret, temp;
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+ u8 val;
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+
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+ /* read MSB */
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+ ret = twl4030_bci_read(reg + 1, &val);
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+ if (ret)
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+ return ret;
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+
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+ temp = (int)(val & 0x03) << 8;
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+
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+ /* read LSB */
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+ ret = twl4030_bci_read(reg, &val);
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+ if (ret)
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+ return ret;
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+
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+ return temp | val;
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+}
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+
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+/*
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+ * Check if VBUS power is present
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+ */
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+static int twl4030_bci_have_vbus(struct twl4030_bci *bci)
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+{
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+ int ret;
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+ u8 hwsts;
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+
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+ ret = twl_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &hwsts,
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+ TWL4030_PM_MASTER_STS_HW_CONDITIONS);
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+ if (ret < 0)
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+ return 0;
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+
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+ dev_dbg(bci->dev, "check_vbus: HW_CONDITIONS %02x\n", hwsts);
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+
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+ /* in case we also have STS_USB_ID, VBUS is driven by TWL itself */
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+ if ((hwsts & TWL4030_STS_VBUS) && !(hwsts & TWL4030_STS_USB_ID))
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+ return 1;
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+
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+ return 0;
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+}
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+
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+/*
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+ * Enable/Disable USB Charge funtionality.
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+ */
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+static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
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+{
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+ int ret;
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+
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+ if (enable) {
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+ /* Check for USB charger conneted */
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+ if (!twl4030_bci_have_vbus(bci))
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+ return -ENODEV;
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+
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+ /*
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+ * Until we can find out what current the device can provide,
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+ * require a module param to enable USB charging.
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+ */
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+ if (!allow_usb) {
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+ dev_warn(bci->dev, "USB charging is disabled.\n");
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+ return -EACCES;
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+ }
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+
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+ /* forcing the field BCIAUTOUSB (BOOT_BCI[1]) to 1 */
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+ ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOUSB);
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+ if (ret < 0)
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+ return ret;
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+
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+ /* forcing USBFASTMCHG(BCIMFSTS4[2]) to 1 */
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+ ret = twl4030_clear_set(TWL4030_MODULE_MAIN_CHARGE, 0,
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+ TWL4030_USBFASTMCHG, TWL4030_BCIMFSTS4);
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+ } else {
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+ ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 0);
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+ }
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+
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+ return ret;
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+}
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+
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+/*
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+ * Enable/Disable AC Charge funtionality.
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+ */
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+static int twl4030_charger_enable_ac(bool enable)
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+{
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+ int ret;
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+
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+ if (enable)
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+ ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOAC);
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+ else
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+ ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC, 0);
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+
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+ return ret;
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+}
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+
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+/*
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+ * TWL4030 CHG_PRES (AC charger presence) events
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+ */
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+static irqreturn_t twl4030_charger_interrupt(int irq, void *arg)
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+{
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+ struct twl4030_bci *bci = arg;
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+
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+ dev_dbg(bci->dev, "CHG_PRES irq\n");
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+ power_supply_changed(&bci->ac);
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+ power_supply_changed(&bci->usb);
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+
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+ return IRQ_HANDLED;
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+}
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+
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+/*
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+ * TWL4030 BCI monitoring events
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+ */
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+static irqreturn_t twl4030_bci_interrupt(int irq, void *arg)
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+{
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+ struct twl4030_bci *bci = arg;
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+ u8 irqs1, irqs2;
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+ int ret;
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+
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+ ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs1,
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+ TWL4030_INTERRUPTS_BCIISR1A);
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+ if (ret < 0)
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+ return IRQ_HANDLED;
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+
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+ ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs2,
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+ TWL4030_INTERRUPTS_BCIISR2A);
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+ if (ret < 0)
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+ return IRQ_HANDLED;
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+
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+ dev_dbg(bci->dev, "BCI irq %02x %02x\n", irqs2, irqs1);
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+
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+ if (irqs1 & (TWL4030_ICHGLOW | TWL4030_ICHGEOC)) {
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+ /* charger state change, inform the core */
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+ power_supply_changed(&bci->ac);
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+ power_supply_changed(&bci->usb);
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+ }
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+
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+ /* various monitoring events, for now we just log them here */
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+ if (irqs1 & (TWL4030_TBATOR2 | TWL4030_TBATOR1))
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+ dev_warn(bci->dev, "battery temperature out of range\n");
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+
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+ if (irqs1 & TWL4030_BATSTS)
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+ dev_crit(bci->dev, "battery disconnected\n");
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+
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+ if (irqs2 & TWL4030_VBATOV)
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+ dev_crit(bci->dev, "VBAT overvoltage\n");
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+
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+ if (irqs2 & TWL4030_VBUSOV)
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+ dev_crit(bci->dev, "VBUS overvoltage\n");
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+
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+ if (irqs2 & TWL4030_ACCHGOV)
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+ dev_crit(bci->dev, "Ac charger overvoltage\n");
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+
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+ return IRQ_HANDLED;
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+}
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+
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+static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val,
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+ void *priv)
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+{
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+ struct twl4030_bci *bci = container_of(nb, struct twl4030_bci, otg_nb);
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+
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+ dev_dbg(bci->dev, "OTG notify %lu\n", val);
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+
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+ switch (val) {
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+ case USB_EVENT_VBUS:
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+ case USB_EVENT_CHARGER:
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+ twl4030_charger_enable_usb(bci, true);
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+ break;
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+ case USB_EVENT_NONE:
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+ twl4030_charger_enable_usb(bci, false);
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+ break;
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+ }
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+
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+ return NOTIFY_OK;
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+}
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+
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+/*
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+ * TI provided formulas:
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+ * CGAIN == 0: ICHG = (BCIICHG * 1.7) / (2^10 - 1) - 0.85
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+ * CGAIN == 1: ICHG = (BCIICHG * 3.4) / (2^10 - 1) - 1.7
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+ * Here we use integer approximation of:
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+ * CGAIN == 0: val * 1.6618 - 0.85
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+ * CGAIN == 1: (val * 1.6618 - 0.85) * 2
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+ */
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+static int twl4030_charger_get_current(void)
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+{
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+ int curr;
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+ int ret;
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+ u8 bcictl1;
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+
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+ curr = twl4030bci_read_adc_val(TWL4030_BCIICHG);
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+ if (curr < 0)
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+ return curr;
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+
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+ ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
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+ if (ret)
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+ return ret;
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+
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+ ret = (curr * 16618 - 850 * 10000) / 10;
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+ if (bcictl1 & TWL4030_CGAIN)
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+ ret *= 2;
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+
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+ return ret;
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+}
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+
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+/*
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+ * Returns the main charge FSM state
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+ * Or < 0 on failure.
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+ */
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+static int twl4030bci_state(struct twl4030_bci *bci)
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+{
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+ int ret;
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+ u8 state;
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+
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+ ret = twl4030_bci_read(TWL4030_BCIMSTATEC, &state);
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+ if (ret) {
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+ pr_err("twl4030_bci: error reading BCIMSTATEC\n");
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+ return ret;
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+ }
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+
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+ dev_dbg(bci->dev, "state: %02x\n", state);
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+
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+ return state;
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+}
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+
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+static int twl4030_bci_state_to_status(int state)
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+{
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+ state &= TWL4030_MSTATEC_MASK;
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+ if (TWL4030_MSTATEC_QUICK1 <= state && state <= TWL4030_MSTATEC_QUICK7)
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+ return POWER_SUPPLY_STATUS_CHARGING;
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+ else if (TWL4030_MSTATEC_COMPLETE1 <= state &&
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+ state <= TWL4030_MSTATEC_COMPLETE4)
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+ return POWER_SUPPLY_STATUS_FULL;
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+ else
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+ return POWER_SUPPLY_STATUS_NOT_CHARGING;
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+}
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+
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+static int twl4030_bci_get_property(struct power_supply *psy,
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+ enum power_supply_property psp,
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+ union power_supply_propval *val)
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+{
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+ struct twl4030_bci *bci = dev_get_drvdata(psy->dev->parent);
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+ int is_charging;
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+ int state;
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+ int ret;
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+
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+ state = twl4030bci_state(bci);
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+ if (state < 0)
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+ return state;
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+
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+ if (psy->type == POWER_SUPPLY_TYPE_USB)
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+ is_charging = state & TWL4030_MSTATEC_USB;
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+ else
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+ is_charging = state & TWL4030_MSTATEC_AC;
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+
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+ switch (psp) {
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+ case POWER_SUPPLY_PROP_STATUS:
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+ if (is_charging)
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+ val->intval = twl4030_bci_state_to_status(state);
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+ else
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+ val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
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+ break;
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+ case POWER_SUPPLY_PROP_VOLTAGE_NOW:
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+ /* charging must be active for meaningful result */
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+ if (!is_charging)
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+ return -ENODATA;
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+ if (psy->type == POWER_SUPPLY_TYPE_USB) {
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+ ret = twl4030bci_read_adc_val(TWL4030_BCIVBUS);
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+ if (ret < 0)
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+ return ret;
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+ /* BCIVBUS uses ADCIN8, 7/1023 V/step */
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+ val->intval = ret * 6843;
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+ } else {
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+ ret = twl4030bci_read_adc_val(TWL4030_BCIVAC);
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+ if (ret < 0)
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+ return ret;
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+ /* BCIVAC uses ADCIN11, 10/1023 V/step */
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+ val->intval = ret * 9775;
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+ }
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+ break;
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+ 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;
|
|
|
+ default:
|
|
|
+ return -EINVAL;
|
|
|
+ }
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+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,
|
|
|
+};
|
|
|
+
|
|
|
+static int __init twl4030_bci_probe(struct platform_device *pdev)
|
|
|
+{
|
|
|
+ struct twl4030_bci *bci;
|
|
|
+ int ret;
|
|
|
+ int reg;
|
|
|
+
|
|
|
+ bci = kzalloc(sizeof(*bci), GFP_KERNEL);
|
|
|
+ if (bci == NULL)
|
|
|
+ return -ENOMEM;
|
|
|
+
|
|
|
+ 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);
|
|
|
+
|
|
|
+ bci->ac.name = "twl4030_ac";
|
|
|
+ bci->ac.type = POWER_SUPPLY_TYPE_MAINS;
|
|
|
+ bci->ac.properties = twl4030_charger_props;
|
|
|
+ bci->ac.num_properties = ARRAY_SIZE(twl4030_charger_props);
|
|
|
+ bci->ac.get_property = twl4030_bci_get_property;
|
|
|
+
|
|
|
+ ret = power_supply_register(&pdev->dev, &bci->ac);
|
|
|
+ if (ret) {
|
|
|
+ dev_err(&pdev->dev, "failed to register ac: %d\n", ret);
|
|
|
+ goto fail_register_ac;
|
|
|
+ }
|
|
|
+
|
|
|
+ bci->usb.name = "twl4030_usb";
|
|
|
+ bci->usb.type = POWER_SUPPLY_TYPE_USB;
|
|
|
+ bci->usb.properties = twl4030_charger_props;
|
|
|
+ bci->usb.num_properties = ARRAY_SIZE(twl4030_charger_props);
|
|
|
+ bci->usb.get_property = twl4030_bci_get_property;
|
|
|
+
|
|
|
+ ret = power_supply_register(&pdev->dev, &bci->usb);
|
|
|
+ if (ret) {
|
|
|
+ dev_err(&pdev->dev, "failed to register usb: %d\n", ret);
|
|
|
+ goto fail_register_usb;
|
|
|
+ }
|
|
|
+
|
|
|
+ ret = request_threaded_irq(bci->irq_chg, NULL,
|
|
|
+ twl4030_charger_interrupt, 0, pdev->name, bci);
|
|
|
+ if (ret < 0) {
|
|
|
+ dev_err(&pdev->dev, "could not request irq %d, status %d\n",
|
|
|
+ bci->irq_chg, ret);
|
|
|
+ goto fail_chg_irq;
|
|
|
+ }
|
|
|
+
|
|
|
+ ret = request_threaded_irq(bci->irq_bci, NULL,
|
|
|
+ twl4030_bci_interrupt, 0, pdev->name, bci);
|
|
|
+ if (ret < 0) {
|
|
|
+ dev_err(&pdev->dev, "could not request irq %d, status %d\n",
|
|
|
+ bci->irq_bci, ret);
|
|
|
+ goto fail_bci_irq;
|
|
|
+ }
|
|
|
+
|
|
|
+ bci->transceiver = otg_get_transceiver();
|
|
|
+ if (bci->transceiver != NULL) {
|
|
|
+ bci->otg_nb.notifier_call = twl4030_bci_usb_ncb;
|
|
|
+ otg_register_notifier(bci->transceiver, &bci->otg_nb);
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Enable interrupts now. */
|
|
|
+ reg = ~(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);
|
|
|
+ goto fail_unmask_interrupts;
|
|
|
+ }
|
|
|
+
|
|
|
+ reg = ~(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_enable_ac(true);
|
|
|
+ twl4030_charger_enable_usb(bci, true);
|
|
|
+
|
|
|
+ return 0;
|
|
|
+
|
|
|
+fail_unmask_interrupts:
|
|
|
+ if (bci->transceiver != NULL) {
|
|
|
+ otg_unregister_notifier(bci->transceiver, &bci->otg_nb);
|
|
|
+ otg_put_transceiver(bci->transceiver);
|
|
|
+ }
|
|
|
+ free_irq(bci->irq_bci, bci);
|
|
|
+fail_bci_irq:
|
|
|
+ free_irq(bci->irq_chg, bci);
|
|
|
+fail_chg_irq:
|
|
|
+ power_supply_unregister(&bci->usb);
|
|
|
+fail_register_usb:
|
|
|
+ power_supply_unregister(&bci->ac);
|
|
|
+fail_register_ac:
|
|
|
+ platform_set_drvdata(pdev, NULL);
|
|
|
+ kfree(bci);
|
|
|
+
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+
|
|
|
+static int __exit twl4030_bci_remove(struct platform_device *pdev)
|
|
|
+{
|
|
|
+ struct twl4030_bci *bci = platform_get_drvdata(pdev);
|
|
|
+
|
|
|
+ twl4030_charger_enable_ac(false);
|
|
|
+ twl4030_charger_enable_usb(bci, false);
|
|
|
+
|
|
|
+ /* mask interrupts */
|
|
|
+ twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
|
|
|
+ TWL4030_INTERRUPTS_BCIIMR1A);
|
|
|
+ twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
|
|
|
+ TWL4030_INTERRUPTS_BCIIMR2A);
|
|
|
+
|
|
|
+ if (bci->transceiver != NULL) {
|
|
|
+ otg_unregister_notifier(bci->transceiver, &bci->otg_nb);
|
|
|
+ otg_put_transceiver(bci->transceiver);
|
|
|
+ }
|
|
|
+ free_irq(bci->irq_bci, bci);
|
|
|
+ free_irq(bci->irq_chg, bci);
|
|
|
+ power_supply_unregister(&bci->usb);
|
|
|
+ power_supply_unregister(&bci->ac);
|
|
|
+ platform_set_drvdata(pdev, NULL);
|
|
|
+ kfree(bci);
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static struct platform_driver twl4030_bci_driver = {
|
|
|
+ .driver = {
|
|
|
+ .name = "twl4030_bci",
|
|
|
+ .owner = THIS_MODULE,
|
|
|
+ },
|
|
|
+ .remove = __exit_p(twl4030_bci_remove),
|
|
|
+};
|
|
|
+
|
|
|
+static int __init twl4030_bci_init(void)
|
|
|
+{
|
|
|
+ return platform_driver_probe(&twl4030_bci_driver, twl4030_bci_probe);
|
|
|
+}
|
|
|
+module_init(twl4030_bci_init);
|
|
|
+
|
|
|
+static void __exit twl4030_bci_exit(void)
|
|
|
+{
|
|
|
+ platform_driver_unregister(&twl4030_bci_driver);
|
|
|
+}
|
|
|
+module_exit(twl4030_bci_exit);
|
|
|
+
|
|
|
+MODULE_AUTHOR("Gražydas Ignotas");
|
|
|
+MODULE_DESCRIPTION("TWL4030 Battery Charger Interface driver");
|
|
|
+MODULE_LICENSE("GPL");
|
|
|
+MODULE_ALIAS("platform:twl4030_bci");
|
Linus Torvalds