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0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * TWL4030/TPS65950 BCI (Battery Charger Interface) driver
0004  *
0005  * Copyright (C) 2010 Gražvydas Ignotas <notasas@gmail.com>
0006  *
0007  * based on twl4030_bci_battery.c by TI
0008  * Copyright (C) 2008 Texas Instruments, Inc.
0009  */
0010 
0011 #include <linux/init.h>
0012 #include <linux/module.h>
0013 #include <linux/slab.h>
0014 #include <linux/err.h>
0015 #include <linux/platform_device.h>
0016 #include <linux/interrupt.h>
0017 #include <linux/mfd/twl.h>
0018 #include <linux/power_supply.h>
0019 #include <linux/notifier.h>
0020 #include <linux/usb/otg.h>
0021 #include <linux/iio/consumer.h>
0022 
0023 #define TWL4030_BCIMDEN     0x00
0024 #define TWL4030_BCIMDKEY    0x01
0025 #define TWL4030_BCIMSTATEC  0x02
0026 #define TWL4030_BCIICHG     0x08
0027 #define TWL4030_BCIVAC      0x0a
0028 #define TWL4030_BCIVBUS     0x0c
0029 #define TWL4030_BCIMFSTS3   0x0F
0030 #define TWL4030_BCIMFSTS4   0x10
0031 #define TWL4030_BCICTL1     0x23
0032 #define TWL4030_BB_CFG      0x12
0033 #define TWL4030_BCIIREF1    0x27
0034 #define TWL4030_BCIIREF2    0x28
0035 #define TWL4030_BCIMFKEY    0x11
0036 #define TWL4030_BCIMFEN3    0x14
0037 #define TWL4030_BCIMFTH8    0x1d
0038 #define TWL4030_BCIMFTH9    0x1e
0039 #define TWL4030_BCIWDKEY    0x21
0040 
0041 #define TWL4030_BCIMFSTS1   0x01
0042 
0043 #define TWL4030_BCIAUTOWEN  BIT(5)
0044 #define TWL4030_CONFIG_DONE BIT(4)
0045 #define TWL4030_CVENAC      BIT(2)
0046 #define TWL4030_BCIAUTOUSB  BIT(1)
0047 #define TWL4030_BCIAUTOAC   BIT(0)
0048 #define TWL4030_CGAIN       BIT(5)
0049 #define TWL4030_USBFASTMCHG BIT(2)
0050 #define TWL4030_STS_VBUS    BIT(7)
0051 #define TWL4030_STS_USB_ID  BIT(2)
0052 #define TWL4030_BBCHEN      BIT(4)
0053 #define TWL4030_BBSEL_MASK  0x0c
0054 #define TWL4030_BBSEL_2V5   0x00
0055 #define TWL4030_BBSEL_3V0   0x04
0056 #define TWL4030_BBSEL_3V1   0x08
0057 #define TWL4030_BBSEL_3V2   0x0c
0058 #define TWL4030_BBISEL_MASK 0x03
0059 #define TWL4030_BBISEL_25uA 0x00
0060 #define TWL4030_BBISEL_150uA    0x01
0061 #define TWL4030_BBISEL_500uA    0x02
0062 #define TWL4030_BBISEL_1000uA   0x03
0063 
0064 #define TWL4030_BATSTSPCHG  BIT(2)
0065 #define TWL4030_BATSTSMCHG  BIT(6)
0066 
0067 /* BCI interrupts */
0068 #define TWL4030_WOVF        BIT(0) /* Watchdog overflow */
0069 #define TWL4030_TMOVF       BIT(1) /* Timer overflow */
0070 #define TWL4030_ICHGHIGH    BIT(2) /* Battery charge current high */
0071 #define TWL4030_ICHGLOW     BIT(3) /* Battery cc. low / FSM state change */
0072 #define TWL4030_ICHGEOC     BIT(4) /* Battery current end-of-charge */
0073 #define TWL4030_TBATOR2     BIT(5) /* Battery temperature out of range 2 */
0074 #define TWL4030_TBATOR1     BIT(6) /* Battery temperature out of range 1 */
0075 #define TWL4030_BATSTS      BIT(7) /* Battery status */
0076 
0077 #define TWL4030_VBATLVL     BIT(0) /* VBAT level */
0078 #define TWL4030_VBATOV      BIT(1) /* VBAT overvoltage */
0079 #define TWL4030_VBUSOV      BIT(2) /* VBUS overvoltage */
0080 #define TWL4030_ACCHGOV     BIT(3) /* Ac charger overvoltage */
0081 
0082 #define TWL4030_MSTATEC_USB     BIT(4)
0083 #define TWL4030_MSTATEC_AC      BIT(5)
0084 #define TWL4030_MSTATEC_MASK        0x0f
0085 #define TWL4030_MSTATEC_QUICK1      0x02
0086 #define TWL4030_MSTATEC_QUICK7      0x07
0087 #define TWL4030_MSTATEC_COMPLETE1   0x0b
0088 #define TWL4030_MSTATEC_COMPLETE4   0x0e
0089 
0090 /*
0091  * If AC (Accessory Charger) voltage exceeds 4.5V (MADC 11)
0092  * then AC is available.
0093  */
0094 static inline int ac_available(struct iio_channel *channel_vac)
0095 {
0096     int val, err;
0097 
0098     if (!channel_vac)
0099         return 0;
0100 
0101     err = iio_read_channel_processed(channel_vac, &val);
0102     if (err < 0)
0103         return 0;
0104     return val > 4500;
0105 }
0106 
0107 static bool allow_usb;
0108 module_param(allow_usb, bool, 0644);
0109 MODULE_PARM_DESC(allow_usb, "Allow USB charge drawing default current");
0110 
0111 struct twl4030_bci {
0112     struct device       *dev;
0113     struct power_supply *ac;
0114     struct power_supply *usb;
0115     struct usb_phy      *transceiver;
0116     struct notifier_block   usb_nb;
0117     struct work_struct  work;
0118     int         irq_chg;
0119     int         irq_bci;
0120     int         usb_enabled;
0121 
0122     /*
0123      * ichg_* and *_cur values in uA. If any are 'large', we set
0124      * CGAIN to '1' which doubles the range for half the
0125      * precision.
0126      */
0127     unsigned int        ichg_eoc, ichg_lo, ichg_hi;
0128     unsigned int        usb_cur, ac_cur;
0129     struct iio_channel  *channel_vac;
0130     bool            ac_is_active;
0131     int         usb_mode, ac_mode; /* charging mode requested */
0132 #define CHARGE_OFF  0
0133 #define CHARGE_AUTO 1
0134 #define CHARGE_LINEAR   2
0135 
0136     /* When setting the USB current we slowly increase the
0137      * requested current until target is reached or the voltage
0138      * drops below 4.75V.  In the latter case we step back one
0139      * step.
0140      */
0141     unsigned int        usb_cur_target;
0142     struct delayed_work current_worker;
0143 #define USB_CUR_STEP    20000   /* 20mA at a time */
0144 #define USB_MIN_VOLT    4750000 /* 4.75V */
0145 #define USB_CUR_DELAY   msecs_to_jiffies(100)
0146 #define USB_MAX_CURRENT 1700000 /* TWL4030 caps at 1.7A */
0147 
0148     unsigned long       event;
0149 };
0150 
0151 /* strings for 'usb_mode' values */
0152 static const char *modes[] = { "off", "auto", "continuous" };
0153 
0154 /*
0155  * clear and set bits on an given register on a given module
0156  */
0157 static int twl4030_clear_set(u8 mod_no, u8 clear, u8 set, u8 reg)
0158 {
0159     u8 val = 0;
0160     int ret;
0161 
0162     ret = twl_i2c_read_u8(mod_no, &val, reg);
0163     if (ret)
0164         return ret;
0165 
0166     val &= ~clear;
0167     val |= set;
0168 
0169     return twl_i2c_write_u8(mod_no, val, reg);
0170 }
0171 
0172 static int twl4030_bci_read(u8 reg, u8 *val)
0173 {
0174     return twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, val, reg);
0175 }
0176 
0177 static int twl4030_clear_set_boot_bci(u8 clear, u8 set)
0178 {
0179     return twl4030_clear_set(TWL_MODULE_PM_MASTER, clear,
0180             TWL4030_CONFIG_DONE | TWL4030_BCIAUTOWEN | set,
0181             TWL4030_PM_MASTER_BOOT_BCI);
0182 }
0183 
0184 static int twl4030bci_read_adc_val(u8 reg)
0185 {
0186     int ret, temp;
0187     u8 val;
0188 
0189     /* read MSB */
0190     ret = twl4030_bci_read(reg + 1, &val);
0191     if (ret)
0192         return ret;
0193 
0194     temp = (int)(val & 0x03) << 8;
0195 
0196     /* read LSB */
0197     ret = twl4030_bci_read(reg, &val);
0198     if (ret)
0199         return ret;
0200 
0201     return temp | val;
0202 }
0203 
0204 /*
0205  * TI provided formulas:
0206  * CGAIN == 0: ICHG = (BCIICHG * 1.7) / (2^10 - 1) - 0.85
0207  * CGAIN == 1: ICHG = (BCIICHG * 3.4) / (2^10 - 1) - 1.7
0208  * Here we use integer approximation of:
0209  * CGAIN == 0: val * 1.6618 - 0.85 * 1000
0210  * CGAIN == 1: (val * 1.6618 - 0.85 * 1000) * 2
0211  */
0212 /*
0213  * convert twl register value for currents into uA
0214  */
0215 static int regval2ua(int regval, bool cgain)
0216 {
0217     if (cgain)
0218         return (regval * 16618 - 8500 * 1000) / 5;
0219     else
0220         return (regval * 16618 - 8500 * 1000) / 10;
0221 }
0222 
0223 /*
0224  * convert uA currents into twl register value
0225  */
0226 static int ua2regval(int ua, bool cgain)
0227 {
0228     int ret;
0229     if (cgain)
0230         ua /= 2;
0231     ret = (ua * 10 + 8500 * 1000) / 16618;
0232     /* rounding problems */
0233     if (ret < 512)
0234         ret = 512;
0235     return ret;
0236 }
0237 
0238 static int twl4030_charger_update_current(struct twl4030_bci *bci)
0239 {
0240     int status;
0241     int cur;
0242     unsigned reg, cur_reg;
0243     u8 bcictl1, oldreg, fullreg;
0244     bool cgain = false;
0245     u8 boot_bci;
0246 
0247     /*
0248      * If AC (Accessory Charger) voltage exceeds 4.5V (MADC 11)
0249      * and AC is enabled, set current for 'ac'
0250      */
0251     if (ac_available(bci->channel_vac)) {
0252         cur = bci->ac_cur;
0253         bci->ac_is_active = true;
0254     } else {
0255         cur = bci->usb_cur;
0256         bci->ac_is_active = false;
0257         if (cur > bci->usb_cur_target) {
0258             cur = bci->usb_cur_target;
0259             bci->usb_cur = cur;
0260         }
0261         if (cur < bci->usb_cur_target)
0262             schedule_delayed_work(&bci->current_worker, USB_CUR_DELAY);
0263     }
0264 
0265     /* First, check thresholds and see if cgain is needed */
0266     if (bci->ichg_eoc >= 200000)
0267         cgain = true;
0268     if (bci->ichg_lo >= 400000)
0269         cgain = true;
0270     if (bci->ichg_hi >= 820000)
0271         cgain = true;
0272     if (cur > 852000)
0273         cgain = true;
0274 
0275     status = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
0276     if (status < 0)
0277         return status;
0278     if (twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &boot_bci,
0279                 TWL4030_PM_MASTER_BOOT_BCI) < 0)
0280         boot_bci = 0;
0281     boot_bci &= 7;
0282 
0283     if ((!!cgain) != !!(bcictl1 & TWL4030_CGAIN))
0284         /* Need to turn for charging while we change the
0285          * CGAIN bit.  Leave it off while everything is
0286          * updated.
0287          */
0288         twl4030_clear_set_boot_bci(boot_bci, 0);
0289 
0290     /*
0291      * For ichg_eoc, the hardware only supports reg values matching
0292      * 100XXXX000, and requires the XXXX be stored in the high nibble
0293      * of TWL4030_BCIMFTH8.
0294      */
0295     reg = ua2regval(bci->ichg_eoc, cgain);
0296     if (reg > 0x278)
0297         reg = 0x278;
0298     if (reg < 0x200)
0299         reg = 0x200;
0300     reg = (reg >> 3) & 0xf;
0301     fullreg = reg << 4;
0302 
0303     /*
0304      * For ichg_lo, reg value must match 10XXXX0000.
0305      * XXXX is stored in low nibble of TWL4030_BCIMFTH8.
0306      */
0307     reg = ua2regval(bci->ichg_lo, cgain);
0308     if (reg > 0x2F0)
0309         reg = 0x2F0;
0310     if (reg < 0x200)
0311         reg = 0x200;
0312     reg = (reg >> 4) & 0xf;
0313     fullreg |= reg;
0314 
0315     /* ichg_eoc and ichg_lo live in same register */
0316     status = twl4030_bci_read(TWL4030_BCIMFTH8, &oldreg);
0317     if (status < 0)
0318         return status;
0319     if (oldreg != fullreg) {
0320         status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xF4,
0321                       TWL4030_BCIMFKEY);
0322         if (status < 0)
0323             return status;
0324         twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
0325                  fullreg, TWL4030_BCIMFTH8);
0326     }
0327 
0328     /* ichg_hi threshold must be 1XXXX01100 (I think) */
0329     reg = ua2regval(bci->ichg_hi, cgain);
0330     if (reg > 0x3E0)
0331         reg = 0x3E0;
0332     if (reg < 0x200)
0333         reg = 0x200;
0334     fullreg = (reg >> 5) & 0xF;
0335     fullreg <<= 4;
0336     status = twl4030_bci_read(TWL4030_BCIMFTH9, &oldreg);
0337     if (status < 0)
0338         return status;
0339     if ((oldreg & 0xF0) != fullreg) {
0340         fullreg |= (oldreg & 0x0F);
0341         status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7,
0342                       TWL4030_BCIMFKEY);
0343         if (status < 0)
0344             return status;
0345         twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
0346                  fullreg, TWL4030_BCIMFTH9);
0347     }
0348 
0349     /*
0350      * And finally, set the current.  This is stored in
0351      * two registers.
0352      */
0353     reg = ua2regval(cur, cgain);
0354     /* we have only 10 bits */
0355     if (reg > 0x3ff)
0356         reg = 0x3ff;
0357     status = twl4030_bci_read(TWL4030_BCIIREF1, &oldreg);
0358     if (status < 0)
0359         return status;
0360     cur_reg = oldreg;
0361     status = twl4030_bci_read(TWL4030_BCIIREF2, &oldreg);
0362     if (status < 0)
0363         return status;
0364     cur_reg |= oldreg << 8;
0365     if (reg != oldreg) {
0366         /* disable write protection for one write access for
0367          * BCIIREF */
0368         status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7,
0369                       TWL4030_BCIMFKEY);
0370         if (status < 0)
0371             return status;
0372         status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
0373                       (reg & 0x100) ? 3 : 2,
0374                       TWL4030_BCIIREF2);
0375         if (status < 0)
0376             return status;
0377         /* disable write protection for one write access for
0378          * BCIIREF */
0379         status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7,
0380                       TWL4030_BCIMFKEY);
0381         if (status < 0)
0382             return status;
0383         status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
0384                       reg & 0xff,
0385                       TWL4030_BCIIREF1);
0386     }
0387     if ((!!cgain) != !!(bcictl1 & TWL4030_CGAIN)) {
0388         /* Flip CGAIN and re-enable charging */
0389         bcictl1 ^= TWL4030_CGAIN;
0390         twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
0391                  bcictl1, TWL4030_BCICTL1);
0392         twl4030_clear_set_boot_bci(0, boot_bci);
0393     }
0394     return 0;
0395 }
0396 
0397 static int twl4030_charger_get_current(void);
0398 
0399 static void twl4030_current_worker(struct work_struct *data)
0400 {
0401     int v, curr;
0402     int res;
0403     struct twl4030_bci *bci = container_of(data, struct twl4030_bci,
0404                            current_worker.work);
0405 
0406     res = twl4030bci_read_adc_val(TWL4030_BCIVBUS);
0407     if (res < 0)
0408         v = 0;
0409     else
0410         /* BCIVBUS uses ADCIN8, 7/1023 V/step */
0411         v = res * 6843;
0412     curr = twl4030_charger_get_current();
0413 
0414     dev_dbg(bci->dev, "v=%d cur=%d limit=%d target=%d\n", v, curr,
0415         bci->usb_cur, bci->usb_cur_target);
0416 
0417     if (v < USB_MIN_VOLT) {
0418         /* Back up and stop adjusting. */
0419         if (bci->usb_cur >= USB_CUR_STEP)
0420             bci->usb_cur -= USB_CUR_STEP;
0421         bci->usb_cur_target = bci->usb_cur;
0422     } else if (bci->usb_cur >= bci->usb_cur_target ||
0423            bci->usb_cur + USB_CUR_STEP > USB_MAX_CURRENT) {
0424         /* Reached target and voltage is OK - stop */
0425         return;
0426     } else {
0427         bci->usb_cur += USB_CUR_STEP;
0428         schedule_delayed_work(&bci->current_worker, USB_CUR_DELAY);
0429     }
0430     twl4030_charger_update_current(bci);
0431 }
0432 
0433 /*
0434  * Enable/Disable USB Charge functionality.
0435  */
0436 static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
0437 {
0438     int ret;
0439     u32 reg;
0440 
0441     if (bci->usb_mode == CHARGE_OFF)
0442         enable = false;
0443     if (enable && !IS_ERR_OR_NULL(bci->transceiver)) {
0444 
0445         twl4030_charger_update_current(bci);
0446 
0447         /* Need to keep phy powered */
0448         if (!bci->usb_enabled) {
0449             pm_runtime_get_sync(bci->transceiver->dev);
0450             bci->usb_enabled = 1;
0451         }
0452 
0453         if (bci->usb_mode == CHARGE_AUTO) {
0454             /* Enable interrupts now. */
0455             reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_ICHGEOC |
0456                     TWL4030_TBATOR2 | TWL4030_TBATOR1 |
0457                     TWL4030_BATSTS);
0458             ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
0459                        TWL4030_INTERRUPTS_BCIIMR1A);
0460             if (ret < 0) {
0461                 dev_err(bci->dev,
0462                     "failed to unmask interrupts: %d\n",
0463                     ret);
0464                 return ret;
0465             }
0466             /* forcing the field BCIAUTOUSB (BOOT_BCI[1]) to 1 */
0467             ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOUSB);
0468         }
0469 
0470         /* forcing USBFASTMCHG(BCIMFSTS4[2]) to 1 */
0471         ret = twl4030_clear_set(TWL_MODULE_MAIN_CHARGE, 0,
0472             TWL4030_USBFASTMCHG, TWL4030_BCIMFSTS4);
0473         if (bci->usb_mode == CHARGE_LINEAR) {
0474             /* Enable interrupts now. */
0475             reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_TBATOR2 |
0476                     TWL4030_TBATOR1 | TWL4030_BATSTS);
0477             ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
0478                        TWL4030_INTERRUPTS_BCIIMR1A);
0479             if (ret < 0) {
0480                 dev_err(bci->dev,
0481                     "failed to unmask interrupts: %d\n",
0482                     ret);
0483                 return ret;
0484             }
0485             twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC|TWL4030_CVENAC, 0);
0486             /* Watch dog key: WOVF acknowledge */
0487             ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x33,
0488                            TWL4030_BCIWDKEY);
0489             /* 0x24 + EKEY6: off mode */
0490             ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x2a,
0491                            TWL4030_BCIMDKEY);
0492             /* EKEY2: Linear charge: USB path */
0493             ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x26,
0494                            TWL4030_BCIMDKEY);
0495             /* WDKEY5: stop watchdog count */
0496             ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xf3,
0497                            TWL4030_BCIWDKEY);
0498             /* enable MFEN3 access */
0499             ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x9c,
0500                            TWL4030_BCIMFKEY);
0501              /* ICHGEOCEN - end-of-charge monitor (current < 80mA)
0502               *                      (charging continues)
0503               * ICHGLOWEN - current level monitor (charge continues)
0504               * don't monitor over-current or heat save
0505               */
0506             ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xf0,
0507                            TWL4030_BCIMFEN3);
0508         }
0509     } else {
0510         ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 0);
0511         ret |= twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x2a,
0512                     TWL4030_BCIMDKEY);
0513         if (bci->usb_enabled) {
0514             pm_runtime_mark_last_busy(bci->transceiver->dev);
0515             pm_runtime_put_autosuspend(bci->transceiver->dev);
0516             bci->usb_enabled = 0;
0517         }
0518         bci->usb_cur = 0;
0519     }
0520 
0521     return ret;
0522 }
0523 
0524 /*
0525  * Enable/Disable AC Charge funtionality.
0526  */
0527 static int twl4030_charger_enable_ac(struct twl4030_bci *bci, bool enable)
0528 {
0529     int ret;
0530 
0531     if (bci->ac_mode == CHARGE_OFF)
0532         enable = false;
0533 
0534     if (enable)
0535         ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOAC);
0536     else
0537         ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC, 0);
0538 
0539     return ret;
0540 }
0541 
0542 /*
0543  * Enable/Disable charging of Backup Battery.
0544  */
0545 static int twl4030_charger_enable_backup(int uvolt, int uamp)
0546 {
0547     int ret;
0548     u8 flags;
0549 
0550     if (uvolt < 2500000 ||
0551         uamp < 25) {
0552         /* disable charging of backup battery */
0553         ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER,
0554                     TWL4030_BBCHEN, 0, TWL4030_BB_CFG);
0555         return ret;
0556     }
0557 
0558     flags = TWL4030_BBCHEN;
0559     if (uvolt >= 3200000)
0560         flags |= TWL4030_BBSEL_3V2;
0561     else if (uvolt >= 3100000)
0562         flags |= TWL4030_BBSEL_3V1;
0563     else if (uvolt >= 3000000)
0564         flags |= TWL4030_BBSEL_3V0;
0565     else
0566         flags |= TWL4030_BBSEL_2V5;
0567 
0568     if (uamp >= 1000)
0569         flags |= TWL4030_BBISEL_1000uA;
0570     else if (uamp >= 500)
0571         flags |= TWL4030_BBISEL_500uA;
0572     else if (uamp >= 150)
0573         flags |= TWL4030_BBISEL_150uA;
0574     else
0575         flags |= TWL4030_BBISEL_25uA;
0576 
0577     ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER,
0578                 TWL4030_BBSEL_MASK | TWL4030_BBISEL_MASK,
0579                 flags,
0580                 TWL4030_BB_CFG);
0581 
0582     return ret;
0583 }
0584 
0585 /*
0586  * TWL4030 CHG_PRES (AC charger presence) events
0587  */
0588 static irqreturn_t twl4030_charger_interrupt(int irq, void *arg)
0589 {
0590     struct twl4030_bci *bci = arg;
0591 
0592     dev_dbg(bci->dev, "CHG_PRES irq\n");
0593     /* reset current on each 'plug' event */
0594     bci->ac_cur = 500000;
0595     twl4030_charger_update_current(bci);
0596     power_supply_changed(bci->ac);
0597     power_supply_changed(bci->usb);
0598 
0599     return IRQ_HANDLED;
0600 }
0601 
0602 /*
0603  * TWL4030 BCI monitoring events
0604  */
0605 static irqreturn_t twl4030_bci_interrupt(int irq, void *arg)
0606 {
0607     struct twl4030_bci *bci = arg;
0608     u8 irqs1, irqs2;
0609     int ret;
0610 
0611     ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs1,
0612                   TWL4030_INTERRUPTS_BCIISR1A);
0613     if (ret < 0)
0614         return IRQ_HANDLED;
0615 
0616     ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs2,
0617                   TWL4030_INTERRUPTS_BCIISR2A);
0618     if (ret < 0)
0619         return IRQ_HANDLED;
0620 
0621     dev_dbg(bci->dev, "BCI irq %02x %02x\n", irqs2, irqs1);
0622 
0623     if (irqs1 & (TWL4030_ICHGLOW | TWL4030_ICHGEOC)) {
0624         /* charger state change, inform the core */
0625         power_supply_changed(bci->ac);
0626         power_supply_changed(bci->usb);
0627     }
0628     twl4030_charger_update_current(bci);
0629 
0630     /* various monitoring events, for now we just log them here */
0631     if (irqs1 & (TWL4030_TBATOR2 | TWL4030_TBATOR1))
0632         dev_warn(bci->dev, "battery temperature out of range\n");
0633 
0634     if (irqs1 & TWL4030_BATSTS)
0635         dev_crit(bci->dev, "battery disconnected\n");
0636 
0637     if (irqs2 & TWL4030_VBATOV)
0638         dev_crit(bci->dev, "VBAT overvoltage\n");
0639 
0640     if (irqs2 & TWL4030_VBUSOV)
0641         dev_crit(bci->dev, "VBUS overvoltage\n");
0642 
0643     if (irqs2 & TWL4030_ACCHGOV)
0644         dev_crit(bci->dev, "Ac charger overvoltage\n");
0645 
0646     return IRQ_HANDLED;
0647 }
0648 
0649 static void twl4030_bci_usb_work(struct work_struct *data)
0650 {
0651     struct twl4030_bci *bci = container_of(data, struct twl4030_bci, work);
0652 
0653     switch (bci->event) {
0654     case USB_EVENT_VBUS:
0655     case USB_EVENT_CHARGER:
0656         twl4030_charger_enable_usb(bci, true);
0657         break;
0658     case USB_EVENT_NONE:
0659         twl4030_charger_enable_usb(bci, false);
0660         break;
0661     }
0662 }
0663 
0664 static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val,
0665                    void *priv)
0666 {
0667     struct twl4030_bci *bci = container_of(nb, struct twl4030_bci, usb_nb);
0668 
0669     dev_dbg(bci->dev, "OTG notify %lu\n", val);
0670 
0671     /* reset current on each 'plug' event */
0672     if (allow_usb)
0673         bci->usb_cur_target = 500000;
0674     else
0675         bci->usb_cur_target = 100000;
0676 
0677     bci->event = val;
0678     schedule_work(&bci->work);
0679 
0680     return NOTIFY_OK;
0681 }
0682 
0683 /*
0684  * sysfs charger enabled store
0685  */
0686 static ssize_t
0687 twl4030_bci_mode_store(struct device *dev, struct device_attribute *attr,
0688               const char *buf, size_t n)
0689 {
0690     struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
0691     int mode;
0692     int status;
0693 
0694     mode = sysfs_match_string(modes, buf);
0695     if (mode < 0)
0696         return mode;
0697 
0698     if (dev == &bci->ac->dev) {
0699         if (mode == 2)
0700             return -EINVAL;
0701         twl4030_charger_enable_ac(bci, false);
0702         bci->ac_mode = mode;
0703         status = twl4030_charger_enable_ac(bci, true);
0704     } else {
0705         twl4030_charger_enable_usb(bci, false);
0706         bci->usb_mode = mode;
0707         status = twl4030_charger_enable_usb(bci, true);
0708     }
0709     return (status == 0) ? n : status;
0710 }
0711 
0712 /*
0713  * sysfs charger enabled show
0714  */
0715 static ssize_t
0716 twl4030_bci_mode_show(struct device *dev,
0717                  struct device_attribute *attr, char *buf)
0718 {
0719     struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
0720     int len = 0;
0721     int i;
0722     int mode = bci->usb_mode;
0723 
0724     if (dev == &bci->ac->dev)
0725         mode = bci->ac_mode;
0726 
0727     for (i = 0; i < ARRAY_SIZE(modes); i++)
0728         if (mode == i)
0729             len += scnprintf(buf+len, PAGE_SIZE-len,
0730                     "[%s] ", modes[i]);
0731         else
0732             len += scnprintf(buf+len, PAGE_SIZE-len,
0733                     "%s ", modes[i]);
0734     buf[len-1] = '\n';
0735     return len;
0736 }
0737 static DEVICE_ATTR(mode, 0644, twl4030_bci_mode_show,
0738            twl4030_bci_mode_store);
0739 
0740 static int twl4030_charger_get_current(void)
0741 {
0742     int curr;
0743     int ret;
0744     u8 bcictl1;
0745 
0746     curr = twl4030bci_read_adc_val(TWL4030_BCIICHG);
0747     if (curr < 0)
0748         return curr;
0749 
0750     ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
0751     if (ret)
0752         return ret;
0753 
0754     return regval2ua(curr, bcictl1 & TWL4030_CGAIN);
0755 }
0756 
0757 /*
0758  * Returns the main charge FSM state
0759  * Or < 0 on failure.
0760  */
0761 static int twl4030bci_state(struct twl4030_bci *bci)
0762 {
0763     int ret;
0764     u8 state;
0765 
0766     ret = twl4030_bci_read(TWL4030_BCIMSTATEC, &state);
0767     if (ret) {
0768         dev_err(bci->dev, "error reading BCIMSTATEC\n");
0769         return ret;
0770     }
0771 
0772     dev_dbg(bci->dev, "state: %02x\n", state);
0773 
0774     return state;
0775 }
0776 
0777 static int twl4030_bci_state_to_status(int state)
0778 {
0779     state &= TWL4030_MSTATEC_MASK;
0780     if (TWL4030_MSTATEC_QUICK1 <= state && state <= TWL4030_MSTATEC_QUICK7)
0781         return POWER_SUPPLY_STATUS_CHARGING;
0782     else if (TWL4030_MSTATEC_COMPLETE1 <= state &&
0783                     state <= TWL4030_MSTATEC_COMPLETE4)
0784         return POWER_SUPPLY_STATUS_FULL;
0785     else
0786         return POWER_SUPPLY_STATUS_NOT_CHARGING;
0787 }
0788 
0789 static int twl4030_bci_get_property(struct power_supply *psy,
0790                     enum power_supply_property psp,
0791                     union power_supply_propval *val)
0792 {
0793     struct twl4030_bci *bci = dev_get_drvdata(psy->dev.parent);
0794     int is_charging;
0795     int state;
0796     int ret;
0797 
0798     state = twl4030bci_state(bci);
0799     if (state < 0)
0800         return state;
0801 
0802     if (psy->desc->type == POWER_SUPPLY_TYPE_USB)
0803         is_charging = state & TWL4030_MSTATEC_USB;
0804     else
0805         is_charging = state & TWL4030_MSTATEC_AC;
0806     if (!is_charging) {
0807         u8 s;
0808         ret = twl4030_bci_read(TWL4030_BCIMDEN, &s);
0809         if (ret < 0)
0810             return ret;
0811         if (psy->desc->type == POWER_SUPPLY_TYPE_USB)
0812             is_charging = s & 1;
0813         else
0814             is_charging = s & 2;
0815         if (is_charging)
0816             /* A little white lie */
0817             state = TWL4030_MSTATEC_QUICK1;
0818     }
0819 
0820     switch (psp) {
0821     case POWER_SUPPLY_PROP_STATUS:
0822         if (is_charging)
0823             val->intval = twl4030_bci_state_to_status(state);
0824         else
0825             val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
0826         break;
0827     case POWER_SUPPLY_PROP_VOLTAGE_NOW:
0828         /* charging must be active for meaningful result */
0829         if (!is_charging)
0830             return -ENODATA;
0831         if (psy->desc->type == POWER_SUPPLY_TYPE_USB) {
0832             ret = twl4030bci_read_adc_val(TWL4030_BCIVBUS);
0833             if (ret < 0)
0834                 return ret;
0835             /* BCIVBUS uses ADCIN8, 7/1023 V/step */
0836             val->intval = ret * 6843;
0837         } else {
0838             ret = twl4030bci_read_adc_val(TWL4030_BCIVAC);
0839             if (ret < 0)
0840                 return ret;
0841             /* BCIVAC uses ADCIN11, 10/1023 V/step */
0842             val->intval = ret * 9775;
0843         }
0844         break;
0845     case POWER_SUPPLY_PROP_CURRENT_NOW:
0846         if (!is_charging)
0847             return -ENODATA;
0848         /* current measurement is shared between AC and USB */
0849         ret = twl4030_charger_get_current();
0850         if (ret < 0)
0851             return ret;
0852         val->intval = ret;
0853         break;
0854     case POWER_SUPPLY_PROP_ONLINE:
0855         val->intval = is_charging &&
0856             twl4030_bci_state_to_status(state) !=
0857                 POWER_SUPPLY_STATUS_NOT_CHARGING;
0858         break;
0859     case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
0860         val->intval = -1;
0861         if (psy->desc->type != POWER_SUPPLY_TYPE_USB) {
0862             if (!bci->ac_is_active)
0863                 val->intval = bci->ac_cur;
0864         } else {
0865             if (bci->ac_is_active)
0866                 val->intval = bci->usb_cur_target;
0867         }
0868         if (val->intval < 0) {
0869             u8 bcictl1;
0870 
0871             val->intval = twl4030bci_read_adc_val(TWL4030_BCIIREF1);
0872             if (val->intval < 0)
0873                 return val->intval;
0874             ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
0875             if (ret < 0)
0876                 return ret;
0877             val->intval = regval2ua(val->intval, bcictl1 &
0878                             TWL4030_CGAIN);
0879         }
0880         break;
0881     default:
0882         return -EINVAL;
0883     }
0884 
0885     return 0;
0886 }
0887 
0888 static int twl4030_bci_set_property(struct power_supply *psy,
0889                     enum power_supply_property psp,
0890                     const union power_supply_propval *val)
0891 {
0892     struct twl4030_bci *bci = dev_get_drvdata(psy->dev.parent);
0893 
0894     switch (psp) {
0895     case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
0896         if (psy->desc->type == POWER_SUPPLY_TYPE_USB)
0897             bci->usb_cur_target = val->intval;
0898         else
0899             bci->ac_cur = val->intval;
0900         twl4030_charger_update_current(bci);
0901         break;
0902     default:
0903         return -EINVAL;
0904     }
0905 
0906     return 0;
0907 }
0908 
0909 static int twl4030_bci_property_is_writeable(struct power_supply *psy,
0910                       enum power_supply_property psp)
0911 {
0912     switch (psp) {
0913     case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
0914         return true;
0915     default:
0916         return false;
0917     }
0918 }
0919 
0920 static enum power_supply_property twl4030_charger_props[] = {
0921     POWER_SUPPLY_PROP_STATUS,
0922     POWER_SUPPLY_PROP_ONLINE,
0923     POWER_SUPPLY_PROP_VOLTAGE_NOW,
0924     POWER_SUPPLY_PROP_CURRENT_NOW,
0925     POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
0926 };
0927 
0928 #ifdef CONFIG_OF
0929 static const struct twl4030_bci_platform_data *
0930 twl4030_bci_parse_dt(struct device *dev)
0931 {
0932     struct device_node *np = dev->of_node;
0933     struct twl4030_bci_platform_data *pdata;
0934     u32 num;
0935 
0936     if (!np)
0937         return NULL;
0938     pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
0939     if (!pdata)
0940         return pdata;
0941 
0942     if (of_property_read_u32(np, "ti,bb-uvolt", &num) == 0)
0943         pdata->bb_uvolt = num;
0944     if (of_property_read_u32(np, "ti,bb-uamp", &num) == 0)
0945         pdata->bb_uamp = num;
0946     return pdata;
0947 }
0948 #else
0949 static inline const struct twl4030_bci_platform_data *
0950 twl4030_bci_parse_dt(struct device *dev)
0951 {
0952     return NULL;
0953 }
0954 #endif
0955 
0956 static const struct power_supply_desc twl4030_bci_ac_desc = {
0957     .name       = "twl4030_ac",
0958     .type       = POWER_SUPPLY_TYPE_MAINS,
0959     .properties = twl4030_charger_props,
0960     .num_properties = ARRAY_SIZE(twl4030_charger_props),
0961     .get_property   = twl4030_bci_get_property,
0962     .set_property   = twl4030_bci_set_property,
0963     .property_is_writeable  = twl4030_bci_property_is_writeable,
0964 };
0965 
0966 static const struct power_supply_desc twl4030_bci_usb_desc = {
0967     .name       = "twl4030_usb",
0968     .type       = POWER_SUPPLY_TYPE_USB,
0969     .properties = twl4030_charger_props,
0970     .num_properties = ARRAY_SIZE(twl4030_charger_props),
0971     .get_property   = twl4030_bci_get_property,
0972     .set_property   = twl4030_bci_set_property,
0973     .property_is_writeable  = twl4030_bci_property_is_writeable,
0974 };
0975 
0976 static int twl4030_bci_probe(struct platform_device *pdev)
0977 {
0978     struct twl4030_bci *bci;
0979     const struct twl4030_bci_platform_data *pdata = pdev->dev.platform_data;
0980     int ret;
0981     u32 reg;
0982 
0983     bci = devm_kzalloc(&pdev->dev, sizeof(*bci), GFP_KERNEL);
0984     if (bci == NULL)
0985         return -ENOMEM;
0986 
0987     if (!pdata)
0988         pdata = twl4030_bci_parse_dt(&pdev->dev);
0989 
0990     bci->ichg_eoc = 80100; /* Stop charging when current drops to here */
0991     bci->ichg_lo = 241000; /* Low threshold */
0992     bci->ichg_hi = 500000; /* High threshold */
0993     bci->ac_cur = 500000; /* 500mA */
0994     if (allow_usb)
0995         bci->usb_cur_target = 500000;  /* 500mA */
0996     else
0997         bci->usb_cur_target = 100000;  /* 100mA */
0998     bci->usb_mode = CHARGE_AUTO;
0999     bci->ac_mode = CHARGE_AUTO;
1000 
1001     bci->dev = &pdev->dev;
1002     bci->irq_chg = platform_get_irq(pdev, 0);
1003     bci->irq_bci = platform_get_irq(pdev, 1);
1004 
1005     platform_set_drvdata(pdev, bci);
1006 
1007     INIT_WORK(&bci->work, twl4030_bci_usb_work);
1008     INIT_DELAYED_WORK(&bci->current_worker, twl4030_current_worker);
1009 
1010     bci->channel_vac = devm_iio_channel_get(&pdev->dev, "vac");
1011     if (IS_ERR(bci->channel_vac)) {
1012         ret = PTR_ERR(bci->channel_vac);
1013         if (ret == -EPROBE_DEFER)
1014             return ret; /* iio not ready */
1015         dev_warn(&pdev->dev, "could not request vac iio channel (%d)",
1016             ret);
1017         bci->channel_vac = NULL;
1018     }
1019 
1020     if (bci->dev->of_node) {
1021         struct device_node *phynode;
1022 
1023         phynode = of_get_compatible_child(bci->dev->of_node->parent,
1024                           "ti,twl4030-usb");
1025         if (phynode) {
1026             bci->usb_nb.notifier_call = twl4030_bci_usb_ncb;
1027             bci->transceiver = devm_usb_get_phy_by_node(
1028                 bci->dev, phynode, &bci->usb_nb);
1029             of_node_put(phynode);
1030             if (IS_ERR(bci->transceiver)) {
1031                 ret = PTR_ERR(bci->transceiver);
1032                 if (ret == -EPROBE_DEFER)
1033                     return ret; /* phy not ready */
1034                 dev_warn(&pdev->dev, "could not request transceiver (%d)",
1035                     ret);
1036                 bci->transceiver = NULL;
1037             }
1038         }
1039     }
1040 
1041     bci->ac = devm_power_supply_register(&pdev->dev, &twl4030_bci_ac_desc,
1042                          NULL);
1043     if (IS_ERR(bci->ac)) {
1044         ret = PTR_ERR(bci->ac);
1045         dev_err(&pdev->dev, "failed to register ac: %d\n", ret);
1046         return ret;
1047     }
1048 
1049     bci->usb = devm_power_supply_register(&pdev->dev, &twl4030_bci_usb_desc,
1050                           NULL);
1051     if (IS_ERR(bci->usb)) {
1052         ret = PTR_ERR(bci->usb);
1053         dev_err(&pdev->dev, "failed to register usb: %d\n", ret);
1054         return ret;
1055     }
1056 
1057     ret = devm_request_threaded_irq(&pdev->dev, bci->irq_chg, NULL,
1058             twl4030_charger_interrupt, IRQF_ONESHOT, pdev->name,
1059             bci);
1060     if (ret < 0) {
1061         dev_err(&pdev->dev, "could not request irq %d, status %d\n",
1062             bci->irq_chg, ret);
1063         return ret;
1064     }
1065 
1066     ret = devm_request_threaded_irq(&pdev->dev, bci->irq_bci, NULL,
1067             twl4030_bci_interrupt, IRQF_ONESHOT, pdev->name, bci);
1068     if (ret < 0) {
1069         dev_err(&pdev->dev, "could not request irq %d, status %d\n",
1070             bci->irq_bci, ret);
1071         return ret;
1072     }
1073 
1074     /* Enable interrupts now. */
1075     reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_ICHGEOC | TWL4030_TBATOR2 |
1076         TWL4030_TBATOR1 | TWL4030_BATSTS);
1077     ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
1078                    TWL4030_INTERRUPTS_BCIIMR1A);
1079     if (ret < 0) {
1080         dev_err(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
1081         return ret;
1082     }
1083 
1084     reg = ~(u32)(TWL4030_VBATOV | TWL4030_VBUSOV | TWL4030_ACCHGOV);
1085     ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
1086                    TWL4030_INTERRUPTS_BCIIMR2A);
1087     if (ret < 0)
1088         dev_warn(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
1089 
1090     twl4030_charger_update_current(bci);
1091     if (device_create_file(&bci->usb->dev, &dev_attr_mode))
1092         dev_warn(&pdev->dev, "could not create sysfs file\n");
1093     if (device_create_file(&bci->ac->dev, &dev_attr_mode))
1094         dev_warn(&pdev->dev, "could not create sysfs file\n");
1095 
1096     twl4030_charger_enable_ac(bci, true);
1097     if (!IS_ERR_OR_NULL(bci->transceiver))
1098         twl4030_bci_usb_ncb(&bci->usb_nb,
1099                     bci->transceiver->last_event,
1100                     NULL);
1101     else
1102         twl4030_charger_enable_usb(bci, false);
1103     if (pdata)
1104         twl4030_charger_enable_backup(pdata->bb_uvolt,
1105                           pdata->bb_uamp);
1106     else
1107         twl4030_charger_enable_backup(0, 0);
1108 
1109     return 0;
1110 }
1111 
1112 static int twl4030_bci_remove(struct platform_device *pdev)
1113 {
1114     struct twl4030_bci *bci = platform_get_drvdata(pdev);
1115 
1116     twl4030_charger_enable_ac(bci, false);
1117     twl4030_charger_enable_usb(bci, false);
1118     twl4030_charger_enable_backup(0, 0);
1119 
1120     device_remove_file(&bci->usb->dev, &dev_attr_mode);
1121     device_remove_file(&bci->ac->dev, &dev_attr_mode);
1122     /* mask interrupts */
1123     twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
1124              TWL4030_INTERRUPTS_BCIIMR1A);
1125     twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
1126              TWL4030_INTERRUPTS_BCIIMR2A);
1127 
1128     return 0;
1129 }
1130 
1131 static const struct of_device_id twl_bci_of_match[] = {
1132     {.compatible = "ti,twl4030-bci", },
1133     { }
1134 };
1135 MODULE_DEVICE_TABLE(of, twl_bci_of_match);
1136 
1137 static struct platform_driver twl4030_bci_driver = {
1138     .probe = twl4030_bci_probe,
1139     .remove = twl4030_bci_remove,
1140     .driver = {
1141         .name   = "twl4030_bci",
1142         .of_match_table = of_match_ptr(twl_bci_of_match),
1143     },
1144 };
1145 module_platform_driver(twl4030_bci_driver);
1146 
1147 MODULE_AUTHOR("Gražvydas Ignotas");
1148 MODULE_DESCRIPTION("TWL4030 Battery Charger Interface driver");
1149 MODULE_LICENSE("GPL");
1150 MODULE_ALIAS("platform:twl4030_bci");
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