Add I2C driver for Summit Microelectronics SMB347 Battery Charger.

Driver support for the Summit I²C battery charger. This is used in some
Intel devices.

Signed-off-by: Bruce E. Robertson <bruce.e.robertson@intel.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>

1 files changed, 117 insertions, 0 deletions

diff --git a/include/linux/power/smb347-charger.h b/include/linux/power/smb347-charger.h
new file mode 100644
index 000000000000..b3cb20dab55f
--- /dev/null
+++ b/include/linux/power/smb347-charger.h
@@ -0,0 +1,117 @@
+/*
+ * Summit Microelectronics SMB347 Battery Charger Driver
+ *
+ * Copyright (C) 2011, Intel Corporation
+ *
+ * Authors: Bruce E. Robertson <bruce.e.robertson@intel.com>
+ *          Mika Westerberg <mika.westerberg@linux.intel.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef SMB347_CHARGER_H
+#define SMB347_CHARGER_H
+
+#include <linux/types.h>
+#include <linux/power_supply.h>
+
+enum {
+        /* use the default compensation method */
+        SMB347_SOFT_TEMP_COMPENSATE_DEFAULT = -1,
+
+        SMB347_SOFT_TEMP_COMPENSATE_NONE,
+        SMB347_SOFT_TEMP_COMPENSATE_CURRENT,
+        SMB347_SOFT_TEMP_COMPENSATE_VOLTAGE,
+};
+
+/* Use default factory programmed value for hard/soft temperature limit */
+#define SMB347_TEMP_USE_DEFAULT         -273
+
+/*
+ * Charging enable can be controlled by software (via i2c) by
+ * smb347-charger driver or by EN pin (active low/high).
+ */
+enum smb347_chg_enable {
+        SMB347_CHG_ENABLE_SW,
+        SMB347_CHG_ENABLE_PIN_ACTIVE_LOW,
+        SMB347_CHG_ENABLE_PIN_ACTIVE_HIGH,
+};
+
+/**
+ * struct smb347_charger_platform_data - platform data for SMB347 charger
+ * @battery_info: Information about the battery
+ * @max_charge_current: maximum current (in uA) the battery can be charged
+ * @max_charge_voltage: maximum voltage (in uV) the battery can be charged
+ * @pre_charge_current: current (in uA) to use in pre-charging phase
+ * @termination_current: current (in uA) used to determine when the
+ *                       charging cycle terminates
+ * @pre_to_fast_voltage: voltage (in uV) treshold used for transitioning to
+ *                       pre-charge to fast charge mode
+ * @mains_current_limit: maximum input current drawn from AC/DC input (in uA)
+ * @usb_hc_current_limit: maximum input high current (in uA) drawn from USB
+ *                        input
+ * @chip_temp_threshold: die temperature where device starts limiting charge
+ *                       current [%100 - %130] (in degree C)
+ * @soft_cold_temp_limit: soft cold temperature limit [%0 - %15] (in degree C),
+ *                        granularity is 5 deg C.
+ * @soft_hot_temp_limit: soft hot temperature limit [%40 - %55] (in degree  C),
+ *                       granularity is 5 deg C.
+ * @hard_cold_temp_limit: hard cold temperature limit [%-5 - %10] (in degree C),
+ *                        granularity is 5 deg C.
+ * @hard_hot_temp_limit: hard hot temperature limit [%50 - %65] (in degree C),
+ *                       granularity is 5 deg C.
+ * @suspend_on_hard_temp_limit: suspend charging when hard limit is hit
+ * @soft_temp_limit_compensation: compensation method when soft temperature
+ *                                limit is hit
+ * @charge_current_compensation: current (in uA) for charging compensation
+ *                               current when temperature hits soft limits
+ * @use_mains: AC/DC input can be used
+ * @use_usb: USB input can be used
+ * @use_usb_otg: USB OTG output can be used (not implemented yet)
+ * @irq_gpio: GPIO number used for interrupts (%-1 if not used)
+ * @enable_control: how charging enable/disable is controlled
+ *                  (driver/pin controls)
+ *
+ * @use_main, @use_usb, and @use_usb_otg are means to enable/disable
+ * hardware support for these. This is useful when we want to have for
+ * example OTG charging controlled via OTG transceiver driver and not by
+ * the SMB347 hardware.
+ *
+ * Hard and soft temperature limit values are given as described in the
+ * device data sheet and assuming NTC beta value is %3750. Even if this is
+ * not the case, these values should be used. They can be mapped to the
+ * corresponding NTC beta values with the help of table %2 in the data
+ * sheet. So for example if NTC beta is %3375 and we want to program hard
+ * hot limit to be %53 deg C, @hard_hot_temp_limit should be set to %50.
+ *
+ * If zero value is given in any of the current and voltage values, the
+ * factory programmed default will be used. For soft/hard temperature
+ * values, pass in %SMB347_TEMP_USE_DEFAULT instead.
+ */
+struct smb347_charger_platform_data {
+        struct power_supply_info battery_info;
+        unsigned int    max_charge_current;
+        unsigned int    max_charge_voltage;
+        unsigned int    pre_charge_current;
+        unsigned int    termination_current;
+        unsigned int    pre_to_fast_voltage;
+        unsigned int    mains_current_limit;
+        unsigned int    usb_hc_current_limit;
+        unsigned int    chip_temp_threshold;
+        int             soft_cold_temp_limit;
+        int             soft_hot_temp_limit;
+        int             hard_cold_temp_limit;
+        int             hard_hot_temp_limit;
+        bool            suspend_on_hard_temp_limit;
+        unsigned int    soft_temp_limit_compensation;
+        unsigned int    charge_current_compensation;
+        bool            use_mains;
+        bool            use_usb;
+        bool            use_usb_otg;
+        int             irq_gpio;
+        enum smb347_chg_enable enable_control;
+};
+
+#endif /* SMB347_CHARGER_H */