Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 1 | /* |
| 2 | * TWL4030/TPS65950 BCI (Battery Charger Interface) driver |
| 3 | * |
| 4 | * Copyright (C) 2010 Gražvydas Ignotas <notasas@gmail.com> |
| 5 | * |
| 6 | * based on twl4030_bci_battery.c by TI |
| 7 | * Copyright (C) 2008 Texas Instruments, Inc. |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License as published by |
| 11 | * the Free Software Foundation; either version 2 of the License, or |
| 12 | * (at your option) any later version. |
| 13 | */ |
| 14 | |
| 15 | #include <linux/init.h> |
| 16 | #include <linux/module.h> |
| 17 | #include <linux/slab.h> |
Kishon Vijay Abraham I | ded017e | 2012-06-26 17:40:32 +0530 | [diff] [blame] | 18 | #include <linux/err.h> |
Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 19 | #include <linux/platform_device.h> |
| 20 | #include <linux/interrupt.h> |
| 21 | #include <linux/i2c/twl.h> |
| 22 | #include <linux/power_supply.h> |
| 23 | #include <linux/notifier.h> |
| 24 | #include <linux/usb/otg.h> |
| 25 | |
| 26 | #define TWL4030_BCIMSTATEC 0x02 |
| 27 | #define TWL4030_BCIICHG 0x08 |
| 28 | #define TWL4030_BCIVAC 0x0a |
| 29 | #define TWL4030_BCIVBUS 0x0c |
Nishanth Menon | 61a7784 | 2014-05-28 16:46:49 -0500 | [diff] [blame] | 30 | #define TWL4030_BCIMFSTS3 0x0F |
Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 31 | #define TWL4030_BCIMFSTS4 0x10 |
| 32 | #define TWL4030_BCICTL1 0x23 |
NeilBrown | 210d4bc | 2012-05-09 07:40:40 +1000 | [diff] [blame] | 33 | #define TWL4030_BB_CFG 0x12 |
Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 34 | |
Nishanth Menon | 61a7784 | 2014-05-28 16:46:49 -0500 | [diff] [blame] | 35 | #define TWL4030_BCIMFSTS1 0x01 |
| 36 | |
Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 37 | #define TWL4030_BCIAUTOWEN BIT(5) |
| 38 | #define TWL4030_CONFIG_DONE BIT(4) |
| 39 | #define TWL4030_BCIAUTOUSB BIT(1) |
| 40 | #define TWL4030_BCIAUTOAC BIT(0) |
| 41 | #define TWL4030_CGAIN BIT(5) |
| 42 | #define TWL4030_USBFASTMCHG BIT(2) |
| 43 | #define TWL4030_STS_VBUS BIT(7) |
| 44 | #define TWL4030_STS_USB_ID BIT(2) |
NeilBrown | 210d4bc | 2012-05-09 07:40:40 +1000 | [diff] [blame] | 45 | #define TWL4030_BBCHEN BIT(4) |
Il Han | 94b05ca | 2012-08-17 16:49:43 +0900 | [diff] [blame] | 46 | #define TWL4030_BBSEL_MASK 0x0c |
| 47 | #define TWL4030_BBSEL_2V5 0x00 |
| 48 | #define TWL4030_BBSEL_3V0 0x04 |
| 49 | #define TWL4030_BBSEL_3V1 0x08 |
| 50 | #define TWL4030_BBSEL_3V2 0x0c |
| 51 | #define TWL4030_BBISEL_MASK 0x03 |
| 52 | #define TWL4030_BBISEL_25uA 0x00 |
| 53 | #define TWL4030_BBISEL_150uA 0x01 |
| 54 | #define TWL4030_BBISEL_500uA 0x02 |
| 55 | #define TWL4030_BBISEL_1000uA 0x03 |
Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 56 | |
Nishanth Menon | 61a7784 | 2014-05-28 16:46:49 -0500 | [diff] [blame] | 57 | #define TWL4030_BATSTSPCHG BIT(2) |
| 58 | #define TWL4030_BATSTSMCHG BIT(6) |
| 59 | |
Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 60 | /* BCI interrupts */ |
| 61 | #define TWL4030_WOVF BIT(0) /* Watchdog overflow */ |
| 62 | #define TWL4030_TMOVF BIT(1) /* Timer overflow */ |
| 63 | #define TWL4030_ICHGHIGH BIT(2) /* Battery charge current high */ |
| 64 | #define TWL4030_ICHGLOW BIT(3) /* Battery cc. low / FSM state change */ |
| 65 | #define TWL4030_ICHGEOC BIT(4) /* Battery current end-of-charge */ |
| 66 | #define TWL4030_TBATOR2 BIT(5) /* Battery temperature out of range 2 */ |
| 67 | #define TWL4030_TBATOR1 BIT(6) /* Battery temperature out of range 1 */ |
| 68 | #define TWL4030_BATSTS BIT(7) /* Battery status */ |
| 69 | |
| 70 | #define TWL4030_VBATLVL BIT(0) /* VBAT level */ |
| 71 | #define TWL4030_VBATOV BIT(1) /* VBAT overvoltage */ |
| 72 | #define TWL4030_VBUSOV BIT(2) /* VBUS overvoltage */ |
| 73 | #define TWL4030_ACCHGOV BIT(3) /* Ac charger overvoltage */ |
| 74 | |
| 75 | #define TWL4030_MSTATEC_USB BIT(4) |
| 76 | #define TWL4030_MSTATEC_AC BIT(5) |
| 77 | #define TWL4030_MSTATEC_MASK 0x0f |
| 78 | #define TWL4030_MSTATEC_QUICK1 0x02 |
| 79 | #define TWL4030_MSTATEC_QUICK7 0x07 |
| 80 | #define TWL4030_MSTATEC_COMPLETE1 0x0b |
| 81 | #define TWL4030_MSTATEC_COMPLETE4 0x0e |
| 82 | |
| 83 | static bool allow_usb; |
Grazvydas Ignotas | 28d48f0 | 2011-06-03 14:43:11 +0300 | [diff] [blame] | 84 | module_param(allow_usb, bool, 0644); |
Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 85 | MODULE_PARM_DESC(allow_usb, "Allow USB charge drawing default current"); |
| 86 | |
| 87 | struct twl4030_bci { |
| 88 | struct device *dev; |
Krzysztof Kozlowski | 297d716 | 2015-03-12 08:44:11 +0100 | [diff] [blame] | 89 | struct power_supply *ac; |
| 90 | struct power_supply *usb; |
Heikki Krogerus | 8675381 | 2012-02-13 13:24:02 +0200 | [diff] [blame] | 91 | struct usb_phy *transceiver; |
Heikki Krogerus | fcc8ebc | 2012-02-13 13:24:16 +0200 | [diff] [blame] | 92 | struct notifier_block usb_nb; |
Heikki Krogerus | d6ccc44 | 2011-02-25 13:56:36 +0200 | [diff] [blame] | 93 | struct work_struct work; |
Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 94 | int irq_chg; |
| 95 | int irq_bci; |
NeilBrown | ab37813 | 2012-05-09 07:40:40 +1000 | [diff] [blame] | 96 | int usb_enabled; |
Heikki Krogerus | d6ccc44 | 2011-02-25 13:56:36 +0200 | [diff] [blame] | 97 | |
| 98 | unsigned long event; |
Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 99 | }; |
| 100 | |
| 101 | /* |
| 102 | * clear and set bits on an given register on a given module |
| 103 | */ |
| 104 | static int twl4030_clear_set(u8 mod_no, u8 clear, u8 set, u8 reg) |
| 105 | { |
| 106 | u8 val = 0; |
| 107 | int ret; |
| 108 | |
| 109 | ret = twl_i2c_read_u8(mod_no, &val, reg); |
| 110 | if (ret) |
| 111 | return ret; |
| 112 | |
| 113 | val &= ~clear; |
| 114 | val |= set; |
| 115 | |
| 116 | return twl_i2c_write_u8(mod_no, val, reg); |
| 117 | } |
| 118 | |
| 119 | static int twl4030_bci_read(u8 reg, u8 *val) |
| 120 | { |
Peter Ujfalusi | e9f14c1 | 2012-11-13 10:42:11 +0100 | [diff] [blame] | 121 | return twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, val, reg); |
Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 122 | } |
| 123 | |
| 124 | static int twl4030_clear_set_boot_bci(u8 clear, u8 set) |
| 125 | { |
Peter Ujfalusi | e9f14c1 | 2012-11-13 10:42:11 +0100 | [diff] [blame] | 126 | return twl4030_clear_set(TWL_MODULE_PM_MASTER, clear, |
Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 127 | TWL4030_CONFIG_DONE | TWL4030_BCIAUTOWEN | set, |
| 128 | TWL4030_PM_MASTER_BOOT_BCI); |
| 129 | } |
| 130 | |
| 131 | static int twl4030bci_read_adc_val(u8 reg) |
| 132 | { |
| 133 | int ret, temp; |
| 134 | u8 val; |
| 135 | |
| 136 | /* read MSB */ |
| 137 | ret = twl4030_bci_read(reg + 1, &val); |
| 138 | if (ret) |
| 139 | return ret; |
| 140 | |
| 141 | temp = (int)(val & 0x03) << 8; |
| 142 | |
| 143 | /* read LSB */ |
| 144 | ret = twl4030_bci_read(reg, &val); |
| 145 | if (ret) |
| 146 | return ret; |
| 147 | |
| 148 | return temp | val; |
| 149 | } |
| 150 | |
| 151 | /* |
Nishanth Menon | 61a7784 | 2014-05-28 16:46:49 -0500 | [diff] [blame] | 152 | * Check if Battery Pack was present |
| 153 | */ |
| 154 | static int twl4030_is_battery_present(struct twl4030_bci *bci) |
| 155 | { |
| 156 | int ret; |
| 157 | u8 val = 0; |
| 158 | |
| 159 | /* Battery presence in Main charge? */ |
| 160 | ret = twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, &val, TWL4030_BCIMFSTS3); |
| 161 | if (ret) |
| 162 | return ret; |
| 163 | if (val & TWL4030_BATSTSMCHG) |
| 164 | return 0; |
| 165 | |
| 166 | /* |
| 167 | * OK, It could be that bootloader did not enable main charger, |
| 168 | * pre-charge is h/w auto. So, Battery presence in Pre-charge? |
| 169 | */ |
| 170 | ret = twl_i2c_read_u8(TWL4030_MODULE_PRECHARGE, &val, |
| 171 | TWL4030_BCIMFSTS1); |
| 172 | if (ret) |
| 173 | return ret; |
| 174 | if (val & TWL4030_BATSTSPCHG) |
| 175 | return 0; |
| 176 | |
| 177 | return -ENODEV; |
| 178 | } |
| 179 | |
| 180 | /* |
NeilBrown | 9c645d2 | 2012-05-09 07:40:39 +1000 | [diff] [blame] | 181 | * Enable/Disable USB Charge functionality. |
Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 182 | */ |
| 183 | static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable) |
| 184 | { |
| 185 | int ret; |
| 186 | |
NeilBrown | e57c4a6 | 2015-07-30 10:11:24 +1000 | [diff] [blame] | 187 | if (enable && !IS_ERR_OR_NULL(bci->transceiver)) { |
Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 188 | /* |
| 189 | * Until we can find out what current the device can provide, |
| 190 | * require a module param to enable USB charging. |
| 191 | */ |
| 192 | if (!allow_usb) { |
| 193 | dev_warn(bci->dev, "USB charging is disabled.\n"); |
| 194 | return -EACCES; |
| 195 | } |
| 196 | |
NeilBrown | e57c4a6 | 2015-07-30 10:11:24 +1000 | [diff] [blame] | 197 | /* Need to keep phy powered */ |
NeilBrown | ab37813 | 2012-05-09 07:40:40 +1000 | [diff] [blame] | 198 | if (!bci->usb_enabled) { |
NeilBrown | e57c4a6 | 2015-07-30 10:11:24 +1000 | [diff] [blame] | 199 | pm_runtime_get_sync(bci->transceiver->dev); |
NeilBrown | ab37813 | 2012-05-09 07:40:40 +1000 | [diff] [blame] | 200 | bci->usb_enabled = 1; |
| 201 | } |
| 202 | |
Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 203 | /* forcing the field BCIAUTOUSB (BOOT_BCI[1]) to 1 */ |
| 204 | ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOUSB); |
| 205 | if (ret < 0) |
| 206 | return ret; |
| 207 | |
| 208 | /* forcing USBFASTMCHG(BCIMFSTS4[2]) to 1 */ |
Peter Ujfalusi | e9f14c1 | 2012-11-13 10:42:11 +0100 | [diff] [blame] | 209 | ret = twl4030_clear_set(TWL_MODULE_MAIN_CHARGE, 0, |
Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 210 | TWL4030_USBFASTMCHG, TWL4030_BCIMFSTS4); |
| 211 | } else { |
| 212 | ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 0); |
NeilBrown | ab37813 | 2012-05-09 07:40:40 +1000 | [diff] [blame] | 213 | if (bci->usb_enabled) { |
NeilBrown | e57c4a6 | 2015-07-30 10:11:24 +1000 | [diff] [blame] | 214 | pm_runtime_mark_last_busy(bci->transceiver->dev); |
| 215 | pm_runtime_put_autosuspend(bci->transceiver->dev); |
NeilBrown | ab37813 | 2012-05-09 07:40:40 +1000 | [diff] [blame] | 216 | bci->usb_enabled = 0; |
| 217 | } |
Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 218 | } |
| 219 | |
| 220 | return ret; |
| 221 | } |
| 222 | |
| 223 | /* |
| 224 | * Enable/Disable AC Charge funtionality. |
| 225 | */ |
| 226 | static int twl4030_charger_enable_ac(bool enable) |
| 227 | { |
| 228 | int ret; |
| 229 | |
| 230 | if (enable) |
| 231 | ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOAC); |
| 232 | else |
| 233 | ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC, 0); |
| 234 | |
| 235 | return ret; |
| 236 | } |
| 237 | |
| 238 | /* |
NeilBrown | 210d4bc | 2012-05-09 07:40:40 +1000 | [diff] [blame] | 239 | * Enable/Disable charging of Backup Battery. |
| 240 | */ |
| 241 | static int twl4030_charger_enable_backup(int uvolt, int uamp) |
| 242 | { |
| 243 | int ret; |
| 244 | u8 flags; |
| 245 | |
| 246 | if (uvolt < 2500000 || |
| 247 | uamp < 25) { |
| 248 | /* disable charging of backup battery */ |
Peter Ujfalusi | e9f14c1 | 2012-11-13 10:42:11 +0100 | [diff] [blame] | 249 | ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER, |
NeilBrown | 210d4bc | 2012-05-09 07:40:40 +1000 | [diff] [blame] | 250 | TWL4030_BBCHEN, 0, TWL4030_BB_CFG); |
| 251 | return ret; |
| 252 | } |
| 253 | |
| 254 | flags = TWL4030_BBCHEN; |
| 255 | if (uvolt >= 3200000) |
| 256 | flags |= TWL4030_BBSEL_3V2; |
| 257 | else if (uvolt >= 3100000) |
| 258 | flags |= TWL4030_BBSEL_3V1; |
| 259 | else if (uvolt >= 3000000) |
| 260 | flags |= TWL4030_BBSEL_3V0; |
| 261 | else |
| 262 | flags |= TWL4030_BBSEL_2V5; |
| 263 | |
| 264 | if (uamp >= 1000) |
| 265 | flags |= TWL4030_BBISEL_1000uA; |
| 266 | else if (uamp >= 500) |
| 267 | flags |= TWL4030_BBISEL_500uA; |
| 268 | else if (uamp >= 150) |
| 269 | flags |= TWL4030_BBISEL_150uA; |
| 270 | else |
| 271 | flags |= TWL4030_BBISEL_25uA; |
| 272 | |
Peter Ujfalusi | e9f14c1 | 2012-11-13 10:42:11 +0100 | [diff] [blame] | 273 | ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER, |
NeilBrown | 210d4bc | 2012-05-09 07:40:40 +1000 | [diff] [blame] | 274 | TWL4030_BBSEL_MASK | TWL4030_BBISEL_MASK, |
| 275 | flags, |
| 276 | TWL4030_BB_CFG); |
| 277 | |
| 278 | return ret; |
| 279 | } |
| 280 | |
| 281 | /* |
Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 282 | * TWL4030 CHG_PRES (AC charger presence) events |
| 283 | */ |
| 284 | static irqreturn_t twl4030_charger_interrupt(int irq, void *arg) |
| 285 | { |
| 286 | struct twl4030_bci *bci = arg; |
| 287 | |
| 288 | dev_dbg(bci->dev, "CHG_PRES irq\n"); |
Krzysztof Kozlowski | 297d716 | 2015-03-12 08:44:11 +0100 | [diff] [blame] | 289 | power_supply_changed(bci->ac); |
| 290 | power_supply_changed(bci->usb); |
Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 291 | |
| 292 | return IRQ_HANDLED; |
| 293 | } |
| 294 | |
| 295 | /* |
| 296 | * TWL4030 BCI monitoring events |
| 297 | */ |
| 298 | static irqreturn_t twl4030_bci_interrupt(int irq, void *arg) |
| 299 | { |
| 300 | struct twl4030_bci *bci = arg; |
| 301 | u8 irqs1, irqs2; |
| 302 | int ret; |
| 303 | |
| 304 | ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs1, |
| 305 | TWL4030_INTERRUPTS_BCIISR1A); |
| 306 | if (ret < 0) |
| 307 | return IRQ_HANDLED; |
| 308 | |
| 309 | ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs2, |
| 310 | TWL4030_INTERRUPTS_BCIISR2A); |
| 311 | if (ret < 0) |
| 312 | return IRQ_HANDLED; |
| 313 | |
| 314 | dev_dbg(bci->dev, "BCI irq %02x %02x\n", irqs2, irqs1); |
| 315 | |
| 316 | if (irqs1 & (TWL4030_ICHGLOW | TWL4030_ICHGEOC)) { |
| 317 | /* charger state change, inform the core */ |
Krzysztof Kozlowski | 297d716 | 2015-03-12 08:44:11 +0100 | [diff] [blame] | 318 | power_supply_changed(bci->ac); |
| 319 | power_supply_changed(bci->usb); |
Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 320 | } |
| 321 | |
| 322 | /* various monitoring events, for now we just log them here */ |
| 323 | if (irqs1 & (TWL4030_TBATOR2 | TWL4030_TBATOR1)) |
| 324 | dev_warn(bci->dev, "battery temperature out of range\n"); |
| 325 | |
| 326 | if (irqs1 & TWL4030_BATSTS) |
| 327 | dev_crit(bci->dev, "battery disconnected\n"); |
| 328 | |
| 329 | if (irqs2 & TWL4030_VBATOV) |
| 330 | dev_crit(bci->dev, "VBAT overvoltage\n"); |
| 331 | |
| 332 | if (irqs2 & TWL4030_VBUSOV) |
| 333 | dev_crit(bci->dev, "VBUS overvoltage\n"); |
| 334 | |
| 335 | if (irqs2 & TWL4030_ACCHGOV) |
| 336 | dev_crit(bci->dev, "Ac charger overvoltage\n"); |
| 337 | |
| 338 | return IRQ_HANDLED; |
| 339 | } |
| 340 | |
Heikki Krogerus | d6ccc44 | 2011-02-25 13:56:36 +0200 | [diff] [blame] | 341 | static void twl4030_bci_usb_work(struct work_struct *data) |
Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 342 | { |
Heikki Krogerus | d6ccc44 | 2011-02-25 13:56:36 +0200 | [diff] [blame] | 343 | struct twl4030_bci *bci = container_of(data, struct twl4030_bci, work); |
Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 344 | |
Heikki Krogerus | d6ccc44 | 2011-02-25 13:56:36 +0200 | [diff] [blame] | 345 | switch (bci->event) { |
Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 346 | case USB_EVENT_VBUS: |
| 347 | case USB_EVENT_CHARGER: |
| 348 | twl4030_charger_enable_usb(bci, true); |
| 349 | break; |
| 350 | case USB_EVENT_NONE: |
| 351 | twl4030_charger_enable_usb(bci, false); |
| 352 | break; |
| 353 | } |
Heikki Krogerus | d6ccc44 | 2011-02-25 13:56:36 +0200 | [diff] [blame] | 354 | } |
| 355 | |
| 356 | static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val, |
| 357 | void *priv) |
| 358 | { |
Heikki Krogerus | fcc8ebc | 2012-02-13 13:24:16 +0200 | [diff] [blame] | 359 | struct twl4030_bci *bci = container_of(nb, struct twl4030_bci, usb_nb); |
Heikki Krogerus | d6ccc44 | 2011-02-25 13:56:36 +0200 | [diff] [blame] | 360 | |
| 361 | dev_dbg(bci->dev, "OTG notify %lu\n", val); |
| 362 | |
| 363 | bci->event = val; |
| 364 | schedule_work(&bci->work); |
Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 365 | |
| 366 | return NOTIFY_OK; |
| 367 | } |
| 368 | |
| 369 | /* |
| 370 | * TI provided formulas: |
| 371 | * CGAIN == 0: ICHG = (BCIICHG * 1.7) / (2^10 - 1) - 0.85 |
| 372 | * CGAIN == 1: ICHG = (BCIICHG * 3.4) / (2^10 - 1) - 1.7 |
| 373 | * Here we use integer approximation of: |
| 374 | * CGAIN == 0: val * 1.6618 - 0.85 |
| 375 | * CGAIN == 1: (val * 1.6618 - 0.85) * 2 |
| 376 | */ |
| 377 | static int twl4030_charger_get_current(void) |
| 378 | { |
| 379 | int curr; |
| 380 | int ret; |
| 381 | u8 bcictl1; |
| 382 | |
| 383 | curr = twl4030bci_read_adc_val(TWL4030_BCIICHG); |
| 384 | if (curr < 0) |
| 385 | return curr; |
| 386 | |
| 387 | ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1); |
| 388 | if (ret) |
| 389 | return ret; |
| 390 | |
| 391 | ret = (curr * 16618 - 850 * 10000) / 10; |
| 392 | if (bcictl1 & TWL4030_CGAIN) |
| 393 | ret *= 2; |
| 394 | |
| 395 | return ret; |
| 396 | } |
| 397 | |
| 398 | /* |
| 399 | * Returns the main charge FSM state |
| 400 | * Or < 0 on failure. |
| 401 | */ |
| 402 | static int twl4030bci_state(struct twl4030_bci *bci) |
| 403 | { |
| 404 | int ret; |
| 405 | u8 state; |
| 406 | |
| 407 | ret = twl4030_bci_read(TWL4030_BCIMSTATEC, &state); |
| 408 | if (ret) { |
| 409 | pr_err("twl4030_bci: error reading BCIMSTATEC\n"); |
| 410 | return ret; |
| 411 | } |
| 412 | |
| 413 | dev_dbg(bci->dev, "state: %02x\n", state); |
| 414 | |
| 415 | return state; |
| 416 | } |
| 417 | |
| 418 | static int twl4030_bci_state_to_status(int state) |
| 419 | { |
| 420 | state &= TWL4030_MSTATEC_MASK; |
| 421 | if (TWL4030_MSTATEC_QUICK1 <= state && state <= TWL4030_MSTATEC_QUICK7) |
| 422 | return POWER_SUPPLY_STATUS_CHARGING; |
| 423 | else if (TWL4030_MSTATEC_COMPLETE1 <= state && |
| 424 | state <= TWL4030_MSTATEC_COMPLETE4) |
| 425 | return POWER_SUPPLY_STATUS_FULL; |
| 426 | else |
| 427 | return POWER_SUPPLY_STATUS_NOT_CHARGING; |
| 428 | } |
| 429 | |
| 430 | static int twl4030_bci_get_property(struct power_supply *psy, |
| 431 | enum power_supply_property psp, |
| 432 | union power_supply_propval *val) |
| 433 | { |
Krzysztof Kozlowski | 297d716 | 2015-03-12 08:44:11 +0100 | [diff] [blame] | 434 | struct twl4030_bci *bci = dev_get_drvdata(psy->dev.parent); |
Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 435 | int is_charging; |
| 436 | int state; |
| 437 | int ret; |
| 438 | |
| 439 | state = twl4030bci_state(bci); |
| 440 | if (state < 0) |
| 441 | return state; |
| 442 | |
Krzysztof Kozlowski | 297d716 | 2015-03-12 08:44:11 +0100 | [diff] [blame] | 443 | if (psy->desc->type == POWER_SUPPLY_TYPE_USB) |
Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 444 | is_charging = state & TWL4030_MSTATEC_USB; |
| 445 | else |
| 446 | is_charging = state & TWL4030_MSTATEC_AC; |
| 447 | |
| 448 | switch (psp) { |
| 449 | case POWER_SUPPLY_PROP_STATUS: |
| 450 | if (is_charging) |
| 451 | val->intval = twl4030_bci_state_to_status(state); |
| 452 | else |
| 453 | val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; |
| 454 | break; |
| 455 | case POWER_SUPPLY_PROP_VOLTAGE_NOW: |
| 456 | /* charging must be active for meaningful result */ |
| 457 | if (!is_charging) |
| 458 | return -ENODATA; |
Krzysztof Kozlowski | 297d716 | 2015-03-12 08:44:11 +0100 | [diff] [blame] | 459 | if (psy->desc->type == POWER_SUPPLY_TYPE_USB) { |
Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 460 | ret = twl4030bci_read_adc_val(TWL4030_BCIVBUS); |
| 461 | if (ret < 0) |
| 462 | return ret; |
| 463 | /* BCIVBUS uses ADCIN8, 7/1023 V/step */ |
| 464 | val->intval = ret * 6843; |
| 465 | } else { |
| 466 | ret = twl4030bci_read_adc_val(TWL4030_BCIVAC); |
| 467 | if (ret < 0) |
| 468 | return ret; |
| 469 | /* BCIVAC uses ADCIN11, 10/1023 V/step */ |
| 470 | val->intval = ret * 9775; |
| 471 | } |
| 472 | break; |
| 473 | case POWER_SUPPLY_PROP_CURRENT_NOW: |
| 474 | if (!is_charging) |
| 475 | return -ENODATA; |
| 476 | /* current measurement is shared between AC and USB */ |
| 477 | ret = twl4030_charger_get_current(); |
| 478 | if (ret < 0) |
| 479 | return ret; |
| 480 | val->intval = ret; |
| 481 | break; |
| 482 | case POWER_SUPPLY_PROP_ONLINE: |
| 483 | val->intval = is_charging && |
| 484 | twl4030_bci_state_to_status(state) != |
| 485 | POWER_SUPPLY_STATUS_NOT_CHARGING; |
| 486 | break; |
| 487 | default: |
| 488 | return -EINVAL; |
| 489 | } |
| 490 | |
| 491 | return 0; |
| 492 | } |
| 493 | |
| 494 | static enum power_supply_property twl4030_charger_props[] = { |
| 495 | POWER_SUPPLY_PROP_STATUS, |
| 496 | POWER_SUPPLY_PROP_ONLINE, |
| 497 | POWER_SUPPLY_PROP_VOLTAGE_NOW, |
| 498 | POWER_SUPPLY_PROP_CURRENT_NOW, |
| 499 | }; |
| 500 | |
NeilBrown | ec0b380 | 2013-10-31 17:05:50 +1100 | [diff] [blame] | 501 | #ifdef CONFIG_OF |
| 502 | static const struct twl4030_bci_platform_data * |
| 503 | twl4030_bci_parse_dt(struct device *dev) |
| 504 | { |
| 505 | struct device_node *np = dev->of_node; |
| 506 | struct twl4030_bci_platform_data *pdata; |
| 507 | u32 num; |
| 508 | |
| 509 | if (!np) |
| 510 | return NULL; |
| 511 | pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); |
| 512 | if (!pdata) |
| 513 | return pdata; |
| 514 | |
| 515 | if (of_property_read_u32(np, "ti,bb-uvolt", &num) == 0) |
| 516 | pdata->bb_uvolt = num; |
| 517 | if (of_property_read_u32(np, "ti,bb-uamp", &num) == 0) |
| 518 | pdata->bb_uamp = num; |
| 519 | return pdata; |
| 520 | } |
| 521 | #else |
| 522 | static inline const struct twl4030_bci_platform_data * |
| 523 | twl4030_bci_parse_dt(struct device *dev) |
| 524 | { |
| 525 | return NULL; |
| 526 | } |
| 527 | #endif |
| 528 | |
Krzysztof Kozlowski | 297d716 | 2015-03-12 08:44:11 +0100 | [diff] [blame] | 529 | static const struct power_supply_desc twl4030_bci_ac_desc = { |
| 530 | .name = "twl4030_ac", |
| 531 | .type = POWER_SUPPLY_TYPE_MAINS, |
| 532 | .properties = twl4030_charger_props, |
| 533 | .num_properties = ARRAY_SIZE(twl4030_charger_props), |
| 534 | .get_property = twl4030_bci_get_property, |
| 535 | }; |
| 536 | |
| 537 | static const struct power_supply_desc twl4030_bci_usb_desc = { |
| 538 | .name = "twl4030_usb", |
| 539 | .type = POWER_SUPPLY_TYPE_USB, |
| 540 | .properties = twl4030_charger_props, |
| 541 | .num_properties = ARRAY_SIZE(twl4030_charger_props), |
| 542 | .get_property = twl4030_bci_get_property, |
| 543 | }; |
| 544 | |
Pavel Machek | 7396f70 | 2015-07-30 10:11:24 +1000 | [diff] [blame] | 545 | static int twl4030_bci_probe(struct platform_device *pdev) |
Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 546 | { |
| 547 | struct twl4030_bci *bci; |
NeilBrown | ec0b380 | 2013-10-31 17:05:50 +1100 | [diff] [blame] | 548 | const struct twl4030_bci_platform_data *pdata = pdev->dev.platform_data; |
Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 549 | int ret; |
Grazvydas Ignotas | 28d48f0 | 2011-06-03 14:43:11 +0300 | [diff] [blame] | 550 | u32 reg; |
Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 551 | |
NeilBrown | 325b50a | 2015-03-23 10:20:28 +1100 | [diff] [blame] | 552 | bci = devm_kzalloc(&pdev->dev, sizeof(*bci), GFP_KERNEL); |
Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 553 | if (bci == NULL) |
| 554 | return -ENOMEM; |
| 555 | |
NeilBrown | ec0b380 | 2013-10-31 17:05:50 +1100 | [diff] [blame] | 556 | if (!pdata) |
| 557 | pdata = twl4030_bci_parse_dt(&pdev->dev); |
| 558 | |
Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 559 | bci->dev = &pdev->dev; |
| 560 | bci->irq_chg = platform_get_irq(pdev, 0); |
| 561 | bci->irq_bci = platform_get_irq(pdev, 1); |
| 562 | |
Nishanth Menon | 61a7784 | 2014-05-28 16:46:49 -0500 | [diff] [blame] | 563 | /* Only proceed further *IF* battery is physically present */ |
| 564 | ret = twl4030_is_battery_present(bci); |
| 565 | if (ret) { |
| 566 | dev_crit(&pdev->dev, "Battery was not detected:%d\n", ret); |
NeilBrown | 325b50a | 2015-03-23 10:20:28 +1100 | [diff] [blame] | 567 | return ret; |
Nishanth Menon | 61a7784 | 2014-05-28 16:46:49 -0500 | [diff] [blame] | 568 | } |
Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 569 | |
Nishanth Menon | 61a7784 | 2014-05-28 16:46:49 -0500 | [diff] [blame] | 570 | platform_set_drvdata(pdev, bci); |
Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 571 | |
NeilBrown | 325b50a | 2015-03-23 10:20:28 +1100 | [diff] [blame] | 572 | bci->ac = devm_power_supply_register(&pdev->dev, &twl4030_bci_ac_desc, |
| 573 | NULL); |
Krzysztof Kozlowski | 297d716 | 2015-03-12 08:44:11 +0100 | [diff] [blame] | 574 | if (IS_ERR(bci->ac)) { |
| 575 | ret = PTR_ERR(bci->ac); |
Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 576 | dev_err(&pdev->dev, "failed to register ac: %d\n", ret); |
NeilBrown | 325b50a | 2015-03-23 10:20:28 +1100 | [diff] [blame] | 577 | return ret; |
Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 578 | } |
| 579 | |
NeilBrown | 325b50a | 2015-03-23 10:20:28 +1100 | [diff] [blame] | 580 | bci->usb = devm_power_supply_register(&pdev->dev, &twl4030_bci_usb_desc, |
| 581 | NULL); |
Krzysztof Kozlowski | 297d716 | 2015-03-12 08:44:11 +0100 | [diff] [blame] | 582 | if (IS_ERR(bci->usb)) { |
| 583 | ret = PTR_ERR(bci->usb); |
Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 584 | dev_err(&pdev->dev, "failed to register usb: %d\n", ret); |
NeilBrown | 325b50a | 2015-03-23 10:20:28 +1100 | [diff] [blame] | 585 | return ret; |
Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 586 | } |
| 587 | |
NeilBrown | 1b7cac2 | 2015-03-23 10:20:28 +1100 | [diff] [blame] | 588 | ret = devm_request_threaded_irq(&pdev->dev, bci->irq_chg, NULL, |
Fengguang Wu | a2778b0 | 2012-08-23 19:56:43 +0800 | [diff] [blame] | 589 | twl4030_charger_interrupt, IRQF_ONESHOT, pdev->name, |
| 590 | bci); |
Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 591 | if (ret < 0) { |
| 592 | dev_err(&pdev->dev, "could not request irq %d, status %d\n", |
| 593 | bci->irq_chg, ret); |
NeilBrown | 325b50a | 2015-03-23 10:20:28 +1100 | [diff] [blame] | 594 | return ret; |
Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 595 | } |
| 596 | |
NeilBrown | 1b7cac2 | 2015-03-23 10:20:28 +1100 | [diff] [blame] | 597 | ret = devm_request_threaded_irq(&pdev->dev, bci->irq_bci, NULL, |
Fengguang Wu | a2778b0 | 2012-08-23 19:56:43 +0800 | [diff] [blame] | 598 | twl4030_bci_interrupt, IRQF_ONESHOT, pdev->name, bci); |
Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 599 | if (ret < 0) { |
| 600 | dev_err(&pdev->dev, "could not request irq %d, status %d\n", |
| 601 | bci->irq_bci, ret); |
NeilBrown | 325b50a | 2015-03-23 10:20:28 +1100 | [diff] [blame] | 602 | return ret; |
Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 603 | } |
| 604 | |
Heikki Krogerus | d6ccc44 | 2011-02-25 13:56:36 +0200 | [diff] [blame] | 605 | INIT_WORK(&bci->work, twl4030_bci_usb_work); |
| 606 | |
NeilBrown | f5e4edb | 2015-03-23 09:52:48 +1100 | [diff] [blame] | 607 | bci->usb_nb.notifier_call = twl4030_bci_usb_ncb; |
| 608 | if (bci->dev->of_node) { |
| 609 | struct device_node *phynode; |
| 610 | |
| 611 | phynode = of_find_compatible_node(bci->dev->of_node->parent, |
| 612 | NULL, "ti,twl4030-usb"); |
NeilBrown | 3fc3895 | 2015-07-30 10:11:24 +1000 | [diff] [blame] | 613 | if (phynode) { |
NeilBrown | f5e4edb | 2015-03-23 09:52:48 +1100 | [diff] [blame] | 614 | bci->transceiver = devm_usb_get_phy_by_node( |
| 615 | bci->dev, phynode, &bci->usb_nb); |
NeilBrown | 3fc3895 | 2015-07-30 10:11:24 +1000 | [diff] [blame] | 616 | if (IS_ERR(bci->transceiver) && |
| 617 | PTR_ERR(bci->transceiver) == -EPROBE_DEFER) |
| 618 | return -EPROBE_DEFER; |
| 619 | } |
Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 620 | } |
| 621 | |
| 622 | /* Enable interrupts now. */ |
Grazvydas Ignotas | 28d48f0 | 2011-06-03 14:43:11 +0300 | [diff] [blame] | 623 | reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_ICHGEOC | TWL4030_TBATOR2 | |
Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 624 | TWL4030_TBATOR1 | TWL4030_BATSTS); |
| 625 | ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg, |
| 626 | TWL4030_INTERRUPTS_BCIIMR1A); |
| 627 | if (ret < 0) { |
| 628 | dev_err(&pdev->dev, "failed to unmask interrupts: %d\n", ret); |
NeilBrown | 325b50a | 2015-03-23 10:20:28 +1100 | [diff] [blame] | 629 | return ret; |
Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 630 | } |
| 631 | |
Grazvydas Ignotas | 28d48f0 | 2011-06-03 14:43:11 +0300 | [diff] [blame] | 632 | reg = ~(u32)(TWL4030_VBATOV | TWL4030_VBUSOV | TWL4030_ACCHGOV); |
Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 633 | ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg, |
| 634 | TWL4030_INTERRUPTS_BCIIMR2A); |
| 635 | if (ret < 0) |
| 636 | dev_warn(&pdev->dev, "failed to unmask interrupts: %d\n", ret); |
| 637 | |
| 638 | twl4030_charger_enable_ac(true); |
NeilBrown | 6e37ec8 | 2015-07-30 10:11:24 +1000 | [diff] [blame^] | 639 | if (!IS_ERR_OR_NULL(bci->transceiver)) |
| 640 | twl4030_bci_usb_ncb(&bci->usb_nb, |
| 641 | bci->transceiver->last_event, |
| 642 | NULL); |
| 643 | else |
| 644 | twl4030_charger_enable_usb(bci, false); |
NeilBrown | ec0b380 | 2013-10-31 17:05:50 +1100 | [diff] [blame] | 645 | if (pdata) |
| 646 | twl4030_charger_enable_backup(pdata->bb_uvolt, |
| 647 | pdata->bb_uamp); |
| 648 | else |
| 649 | twl4030_charger_enable_backup(0, 0); |
Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 650 | |
| 651 | return 0; |
Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 652 | } |
| 653 | |
| 654 | static int __exit twl4030_bci_remove(struct platform_device *pdev) |
| 655 | { |
| 656 | struct twl4030_bci *bci = platform_get_drvdata(pdev); |
| 657 | |
| 658 | twl4030_charger_enable_ac(false); |
| 659 | twl4030_charger_enable_usb(bci, false); |
NeilBrown | 210d4bc | 2012-05-09 07:40:40 +1000 | [diff] [blame] | 660 | twl4030_charger_enable_backup(0, 0); |
Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 661 | |
| 662 | /* mask interrupts */ |
| 663 | twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff, |
| 664 | TWL4030_INTERRUPTS_BCIIMR1A); |
| 665 | twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff, |
| 666 | TWL4030_INTERRUPTS_BCIIMR2A); |
| 667 | |
Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 668 | return 0; |
| 669 | } |
| 670 | |
NeilBrown | ec0b380 | 2013-10-31 17:05:50 +1100 | [diff] [blame] | 671 | static const struct of_device_id twl_bci_of_match[] = { |
| 672 | {.compatible = "ti,twl4030-bci", }, |
| 673 | { } |
| 674 | }; |
| 675 | MODULE_DEVICE_TABLE(of, twl_bci_of_match); |
| 676 | |
Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 677 | static struct platform_driver twl4030_bci_driver = { |
Pavel Machek | 7396f70 | 2015-07-30 10:11:24 +1000 | [diff] [blame] | 678 | .probe = twl4030_bci_probe, |
Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 679 | .driver = { |
| 680 | .name = "twl4030_bci", |
NeilBrown | ec0b380 | 2013-10-31 17:05:50 +1100 | [diff] [blame] | 681 | .of_match_table = of_match_ptr(twl_bci_of_match), |
Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 682 | }, |
| 683 | .remove = __exit_p(twl4030_bci_remove), |
| 684 | }; |
Pavel Machek | 7396f70 | 2015-07-30 10:11:24 +1000 | [diff] [blame] | 685 | module_platform_driver(twl4030_bci_driver); |
Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 686 | |
Grazvydas Ignotas | 28d48f0 | 2011-06-03 14:43:11 +0300 | [diff] [blame] | 687 | MODULE_AUTHOR("Gražvydas Ignotas"); |
Grazvydas Ignotas | 2e727f1 | 2010-09-27 23:18:24 +0300 | [diff] [blame] | 688 | MODULE_DESCRIPTION("TWL4030 Battery Charger Interface driver"); |
| 689 | MODULE_LICENSE("GPL"); |
| 690 | MODULE_ALIAS("platform:twl4030_bci"); |