2 +++ kernel-power/drivers/power/bq2415x_charger.c
5 + bq2415x_charger.c - bq2415x charger driver
6 + Copyright (C) 2011-2012 Pali Rohár <pali.rohar@gmail.com>
8 + This program is free software; you can redistribute it and/or modify
9 + it under the terms of the GNU General Public License as published by
10 + the Free Software Foundation; either version 2 of the License, or
11 + (at your option) any later version.
13 + This program is distributed in the hope that it will be useful,
14 + but WITHOUT ANY WARRANTY; without even the implied warranty of
15 + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 + GNU General Public License for more details.
18 + You should have received a copy of the GNU General Public License along
19 + with this program; if not, write to the Free Software Foundation, Inc.,
20 + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
25 + http://www.ti.com/product/bq24150
26 + http://www.ti.com/product/bq24150a
27 + http://www.ti.com/product/bq24152
28 + http://www.ti.com/product/bq24153
29 + http://www.ti.com/product/bq24153a
30 + http://www.ti.com/product/bq24155
33 +#include <linux/version.h>
34 +#include <linux/kernel.h>
35 +#include <linux/module.h>
36 +#include <linux/param.h>
37 +#include <linux/err.h>
38 +#include <linux/workqueue.h>
39 +#include <linux/sysfs.h>
40 +#include <linux/platform_device.h>
41 +#include <linux/power_supply.h>
42 +#include <linux/idr.h>
43 +#include <linux/i2c.h>
44 +#include <linux/slab.h>
46 +#include <linux/power/bq2415x_charger.h>
48 +/* timeout for resetting chip timer */
49 +#define BQ2415X_TIMER_TIMEOUT 10
51 +#define BQ2415X_REG_STATUS 0x00
52 +#define BQ2415X_REG_CONTROL 0x01
53 +#define BQ2415X_REG_VOLTAGE 0x02
54 +#define BQ2415X_REG_VENDER 0x03
55 +#define BQ2415X_REG_CURRENT 0x04
57 +/* reset state for all registers */
58 +#define BQ2415X_RESET_STATUS BIT(6)
59 +#define BQ2415X_RESET_CONTROL (BIT(4)|BIT(5))
60 +#define BQ2415X_RESET_VOLTAGE (BIT(1)|BIT(3))
61 +#define BQ2415X_RESET_CURRENT (BIT(0)|BIT(3)|BIT(7))
63 +/* status register */
64 +#define BQ2415X_BIT_TMR_RST 7
65 +#define BQ2415X_BIT_OTG 7
66 +#define BQ2415X_BIT_EN_STAT 6
67 +#define BQ2415X_MASK_STAT (BIT(4)|BIT(5))
68 +#define BQ2415X_SHIFT_STAT 4
69 +#define BQ2415X_BIT_BOOST 3
70 +#define BQ2415X_MASK_FAULT (BIT(0)|BIT(1)|BIT(2))
71 +#define BQ2415X_SHIFT_FAULT 0
73 +/* control register */
74 +#define BQ2415X_MASK_LIMIT (BIT(6)|BIT(7))
75 +#define BQ2415X_SHIFT_LIMIT 6
76 +#define BQ2415X_MASK_VLOWV (BIT(4)|BIT(5))
77 +#define BQ2415X_SHIFT_VLOWV 4
78 +#define BQ2415X_BIT_TE 3
79 +#define BQ2415X_BIT_CE 2
80 +#define BQ2415X_BIT_HZ_MODE 1
81 +#define BQ2415X_BIT_OPA_MODE 0
83 +/* voltage register */
84 +#define BQ2415X_MASK_VO (BIT(2)|BIT(3)|BIT(4)|BIT(5)|BIT(6)|BIT(7))
85 +#define BQ2415X_SHIFT_VO 2
86 +#define BQ2415X_BIT_OTG_PL 1
87 +#define BQ2415X_BIT_OTG_EN 0
89 +/* vender register */
90 +#define BQ2415X_MASK_VENDER (BIT(5)|BIT(6)|BIT(7))
91 +#define BQ2415X_SHIFT_VENDER 5
92 +#define BQ2415X_MASK_PN (BIT(3)|BIT(4))
93 +#define BQ2415X_SHIFT_PN 3
94 +#define BQ2415X_MASK_REVISION (BIT(0)|BIT(1)|BIT(2))
95 +#define BQ2415X_SHIFT_REVISION 0
97 +/* current register */
98 +#define BQ2415X_MASK_RESET BIT(7)
99 +#define BQ2415X_MASK_VI_CHRG (BIT(4)|BIT(5)|BIT(6))
100 +#define BQ2415X_SHIFT_VI_CHRG 4
102 +#define BQ2415X_MASK_VI_TERM (BIT(0)|BIT(1)|BIT(2))
103 +#define BQ2415X_SHIFT_VI_TERM 0
106 +enum bq2415x_command {
107 + BQ2415X_TIMER_RESET,
108 + BQ2415X_OTG_STATUS,
109 + BQ2415X_STAT_PIN_STATUS,
110 + BQ2415X_STAT_PIN_ENABLE,
111 + BQ2415X_STAT_PIN_DISABLE,
112 + BQ2415X_CHARGE_STATUS,
113 + BQ2415X_BOOST_STATUS,
114 + BQ2415X_FAULT_STATUS,
116 + BQ2415X_CHARGE_TERMINATION_STATUS,
117 + BQ2415X_CHARGE_TERMINATION_ENABLE,
118 + BQ2415X_CHARGE_TERMINATION_DISABLE,
119 + BQ2415X_CHARGER_STATUS,
120 + BQ2415X_CHARGER_ENABLE,
121 + BQ2415X_CHARGER_DISABLE,
122 + BQ2415X_HIGH_IMPEDANCE_STATUS,
123 + BQ2415X_HIGH_IMPEDANCE_ENABLE,
124 + BQ2415X_HIGH_IMPEDANCE_DISABLE,
125 + BQ2415X_BOOST_MODE_STATUS,
126 + BQ2415X_BOOST_MODE_ENABLE,
127 + BQ2415X_BOOST_MODE_DISABLE,
130 + BQ2415X_OTG_ACTIVATE_HIGH,
131 + BQ2415X_OTG_ACTIVATE_LOW,
132 + BQ2415X_OTG_PIN_STATUS,
133 + BQ2415X_OTG_PIN_ENABLE,
134 + BQ2415X_OTG_PIN_DISABLE,
136 + BQ2415X_VENDER_CODE,
137 + BQ2415X_PART_NUMBER,
156 +static char *bq2415x_chip_name[] = {
171 +struct bq2415x_device {
172 + struct device *dev;
173 + struct bq2415x_platform_data init_data;
174 + struct power_supply charger;
175 + struct delayed_work work;
176 + enum bq2415x_mode reported_mode;/* mode reported by hook function */
177 + enum bq2415x_mode mode; /* current configured mode */
178 + enum bq2415x_chip chip;
179 + const char *timer_error;
182 + int autotimer; /* 1 - if driver automatically reset timer, 0 - not */
183 + int automode; /* 1 - enabled, 0 - disabled; -1 - not supported */
187 +/* each registered chip must have unique id */
188 +static DEFINE_IDR(bq2415x_id);
190 +static DEFINE_MUTEX(bq2415x_id_mutex);
191 +static DEFINE_MUTEX(bq2415x_timer_mutex);
192 +static DEFINE_MUTEX(bq2415x_i2c_mutex);
194 +/**** i2c read functions ****/
196 +/* read value from register */
197 +static int bq2415x_i2c_read(struct bq2415x_device *bq, u8 reg)
199 + struct i2c_client *client = to_i2c_client(bq->dev);
200 + struct i2c_msg msg[2];
204 + if (!client->adapter)
207 + msg[0].addr = client->addr;
210 + msg[0].len = sizeof(reg);
211 + msg[1].addr = client->addr;
212 + msg[1].flags = I2C_M_RD;
214 + msg[1].len = sizeof(val);
216 + mutex_lock(&bq2415x_i2c_mutex);
217 + ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
218 + mutex_unlock(&bq2415x_i2c_mutex);
226 +/* read value from register, apply mask and right shift it */
227 +static int bq2415x_i2c_read_mask(struct bq2415x_device *bq, u8 reg,
235 + ret = bq2415x_i2c_read(bq, reg);
239 + return (ret & mask) >> shift;
242 +/* read value from register and return one specified bit */
243 +static int bq2415x_i2c_read_bit(struct bq2415x_device *bq, u8 reg, u8 bit)
248 + return bq2415x_i2c_read_mask(bq, reg, BIT(bit), bit);
251 +/**** i2c write functions ****/
253 +/* write value to register */
254 +static int bq2415x_i2c_write(struct bq2415x_device *bq, u8 reg, u8 val)
256 + struct i2c_client *client = to_i2c_client(bq->dev);
257 + struct i2c_msg msg[1];
264 + msg[0].addr = client->addr;
267 + msg[0].len = ARRAY_SIZE(data);
269 + mutex_lock(&bq2415x_i2c_mutex);
270 + ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
271 + mutex_unlock(&bq2415x_i2c_mutex);
273 + /* i2c_transfer returns number of messages transferred */
282 +/* read value from register, change it with mask left shifted and write back */
283 +static int bq2415x_i2c_write_mask(struct bq2415x_device *bq, u8 reg, u8 val,
291 + ret = bq2415x_i2c_read(bq, reg);
296 + ret |= val << shift;
298 + return bq2415x_i2c_write(bq, reg, ret);
301 +/* change only one bit in register */
302 +static int bq2415x_i2c_write_bit(struct bq2415x_device *bq, u8 reg,
308 + return bq2415x_i2c_write_mask(bq, reg, val, BIT(bit), bit);
311 +/**** global functions ****/
313 +/* exec command function */
314 +static int bq2415x_exec_command(struct bq2415x_device *bq,
315 + enum bq2415x_command command)
319 + case BQ2415X_TIMER_RESET:
320 + return bq2415x_i2c_write_bit(bq, BQ2415X_REG_STATUS,
321 + 1, BQ2415X_BIT_TMR_RST);
322 + case BQ2415X_OTG_STATUS:
323 + return bq2415x_i2c_read_bit(bq, BQ2415X_REG_STATUS,
325 + case BQ2415X_STAT_PIN_STATUS:
326 + return bq2415x_i2c_read_bit(bq, BQ2415X_REG_STATUS,
327 + BQ2415X_BIT_EN_STAT);
328 + case BQ2415X_STAT_PIN_ENABLE:
329 + return bq2415x_i2c_write_bit(bq, BQ2415X_REG_STATUS, 1,
330 + BQ2415X_BIT_EN_STAT);
331 + case BQ2415X_STAT_PIN_DISABLE:
332 + return bq2415x_i2c_write_bit(bq, BQ2415X_REG_STATUS, 0,
333 + BQ2415X_BIT_EN_STAT);
334 + case BQ2415X_CHARGE_STATUS:
335 + return bq2415x_i2c_read_mask(bq, BQ2415X_REG_STATUS,
336 + BQ2415X_MASK_STAT, BQ2415X_SHIFT_STAT);
337 + case BQ2415X_BOOST_STATUS:
338 + return bq2415x_i2c_read_bit(bq, BQ2415X_REG_STATUS,
339 + BQ2415X_BIT_BOOST);
340 + case BQ2415X_FAULT_STATUS:
341 + return bq2415x_i2c_read_mask(bq, BQ2415X_REG_STATUS,
342 + BQ2415X_MASK_FAULT, BQ2415X_SHIFT_FAULT);
344 + case BQ2415X_CHARGE_TERMINATION_STATUS:
345 + return bq2415x_i2c_read_bit(bq, BQ2415X_REG_CONTROL,
347 + case BQ2415X_CHARGE_TERMINATION_ENABLE:
348 + return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
349 + 1, BQ2415X_BIT_TE);
350 + case BQ2415X_CHARGE_TERMINATION_DISABLE:
351 + return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
352 + 0, BQ2415X_BIT_TE);
353 + case BQ2415X_CHARGER_STATUS:
354 + ret = bq2415x_i2c_read_bit(bq, BQ2415X_REG_CONTROL,
359 + return ret > 0 ? 0 : 1;
360 + case BQ2415X_CHARGER_ENABLE:
361 + return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
362 + 0, BQ2415X_BIT_CE);
363 + case BQ2415X_CHARGER_DISABLE:
364 + return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
365 + 1, BQ2415X_BIT_CE);
366 + case BQ2415X_HIGH_IMPEDANCE_STATUS:
367 + return bq2415x_i2c_read_bit(bq, BQ2415X_REG_CONTROL,
368 + BQ2415X_BIT_HZ_MODE);
369 + case BQ2415X_HIGH_IMPEDANCE_ENABLE:
370 + return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
371 + 1, BQ2415X_BIT_HZ_MODE);
372 + case BQ2415X_HIGH_IMPEDANCE_DISABLE:
373 + return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
374 + 0, BQ2415X_BIT_HZ_MODE);
375 + case BQ2415X_BOOST_MODE_STATUS:
376 + return bq2415x_i2c_read_bit(bq, BQ2415X_REG_CONTROL,
377 + BQ2415X_BIT_OPA_MODE);
378 + case BQ2415X_BOOST_MODE_ENABLE:
379 + return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
380 + 1, BQ2415X_BIT_OPA_MODE);
381 + case BQ2415X_BOOST_MODE_DISABLE:
382 + return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
383 + 0, BQ2415X_BIT_OPA_MODE);
385 + case BQ2415X_OTG_LEVEL:
386 + return bq2415x_i2c_read_bit(bq, BQ2415X_REG_VOLTAGE,
387 + BQ2415X_BIT_OTG_PL);
388 + case BQ2415X_OTG_ACTIVATE_HIGH:
389 + return bq2415x_i2c_write_bit(bq, BQ2415X_REG_VOLTAGE,
390 + 1, BQ2415X_BIT_OTG_PL);
391 + case BQ2415X_OTG_ACTIVATE_LOW:
392 + return bq2415x_i2c_write_bit(bq, BQ2415X_REG_VOLTAGE,
393 + 0, BQ2415X_BIT_OTG_PL);
394 + case BQ2415X_OTG_PIN_STATUS:
395 + return bq2415x_i2c_read_bit(bq, BQ2415X_REG_VOLTAGE,
396 + BQ2415X_BIT_OTG_EN);
397 + case BQ2415X_OTG_PIN_ENABLE:
398 + return bq2415x_i2c_write_bit(bq, BQ2415X_REG_VOLTAGE,
399 + 1, BQ2415X_BIT_OTG_EN);
400 + case BQ2415X_OTG_PIN_DISABLE:
401 + return bq2415x_i2c_write_bit(bq, BQ2415X_REG_VOLTAGE,
402 + 0, BQ2415X_BIT_OTG_EN);
404 + case BQ2415X_VENDER_CODE:
405 + return bq2415x_i2c_read_mask(bq, BQ2415X_REG_VENDER,
406 + BQ2415X_MASK_VENDER, BQ2415X_SHIFT_VENDER);
407 + case BQ2415X_PART_NUMBER:
408 + return bq2415x_i2c_read_mask(bq, BQ2415X_REG_VENDER,
409 + BQ2415X_MASK_PN, BQ2415X_SHIFT_PN);
410 + case BQ2415X_REVISION:
411 + return bq2415x_i2c_read_mask(bq, BQ2415X_REG_VENDER,
412 + BQ2415X_MASK_REVISION, BQ2415X_SHIFT_REVISION);
419 +/* detect chip type */
420 +static enum bq2415x_chip bq2415x_detect_chip(struct bq2415x_device *bq)
422 + struct i2c_client *client = to_i2c_client(bq->dev);
423 + int ret = bq2415x_exec_command(bq, BQ2415X_PART_NUMBER);
428 + switch (client->addr) {
432 + if (bq->chip == BQ24151A)
437 + if (bq->chip == BQ24150A ||
438 + bq->chip == BQ24152 ||
439 + bq->chip == BQ24155)
444 + if (bq->chip == BQ24153A)
456 + if (bq->chip == BQ24156A)
471 +/* detect chip revision */
472 +static int bq2415x_detect_revision(struct bq2415x_device *bq)
474 + int ret = bq2415x_exec_command(bq, BQ2415X_REVISION);
475 + int chip = bq2415x_detect_chip(bq);
476 + if (ret < 0 || chip < 0)
485 + if (ret >= 0 && ret <= 3)
515 +/* return chip vender code */
516 +static int bq2415x_get_vender_code(struct bq2415x_device *bq)
518 + int ret = bq2415x_exec_command(bq, BQ2415X_VENDER_CODE);
521 + else /* convert to binary */
522 + return (ret & 0x1) +
523 + ((ret >> 1) & 0x1) * 10 +
524 + ((ret >> 2) & 0x1) * 100;
527 +/* reset all chip registers to default state */
528 +static void bq2415x_reset_chip(struct bq2415x_device *bq)
530 + bq2415x_i2c_write(bq, BQ2415X_REG_CURRENT, BQ2415X_RESET_CURRENT);
531 + bq2415x_i2c_write(bq, BQ2415X_REG_VOLTAGE, BQ2415X_RESET_VOLTAGE);
532 + bq2415x_i2c_write(bq, BQ2415X_REG_CONTROL, BQ2415X_RESET_CONTROL);
533 + bq2415x_i2c_write(bq, BQ2415X_REG_STATUS, BQ2415X_RESET_STATUS);
534 + bq->timer_error = NULL;
537 +/**** properties functions ****/
539 +/* set current limit in mA */
540 +static int bq2415x_set_current_limit(struct bq2415x_device *bq, int mA)
545 + else if (mA <= 500)
547 + else if (mA <= 800)
551 + return bq2415x_i2c_write_mask(bq, BQ2415X_REG_CONTROL, val,
552 + BQ2415X_MASK_LIMIT, BQ2415X_SHIFT_LIMIT);
555 +/* get current limit in mA */
556 +static int bq2415x_get_current_limit(struct bq2415x_device *bq)
558 + int ret = bq2415x_i2c_read_mask(bq, BQ2415X_REG_CONTROL,
559 + BQ2415X_MASK_LIMIT, BQ2415X_SHIFT_LIMIT);
574 +/* set weak battery voltage in mV */
575 +static int bq2415x_set_weak_battery_voltage(struct bq2415x_device *bq, int mV)
577 + /* round to 100mV */
579 + if (mV <= 3400 + 50)
581 + else if (mV <= 3500 + 50)
583 + else if (mV <= 3600 + 50)
587 + return bq2415x_i2c_write_mask(bq, BQ2415X_REG_CONTROL, val,
588 + BQ2415X_MASK_VLOWV, BQ2415X_SHIFT_VLOWV);
591 +/* get weak battery voltage in mV */
592 +static int bq2415x_get_weak_battery_voltage(struct bq2415x_device *bq)
594 + int ret = bq2415x_i2c_read_mask(bq, BQ2415X_REG_CONTROL,
595 + BQ2415X_MASK_VLOWV, BQ2415X_SHIFT_VLOWV);
599 + return 100 * (34 + ret);
602 +/* set battery regulation voltage in mV */
603 +static int bq2415x_set_battery_regulation_voltage(struct bq2415x_device *bq,
606 + int val = (mV/10 - 350) / 2;
610 + else if (val > 94) /* FIXME: Max is 94 or 122 ? Set max value ? */
613 + return bq2415x_i2c_write_mask(bq, BQ2415X_REG_VOLTAGE, val,
614 + BQ2415X_MASK_VO, BQ2415X_SHIFT_VO);
617 +/* get battery regulation voltage in mV */
618 +static int bq2415x_get_battery_regulation_voltage(struct bq2415x_device *bq)
620 + int ret = bq2415x_i2c_read_mask(bq, BQ2415X_REG_VOLTAGE,
621 + BQ2415X_MASK_VO, BQ2415X_SHIFT_VO);
625 + return 10 * (350 + 2*ret);
628 +/* set charge current in mA (platform data must provide resistor sense) */
629 +static int bq2415x_set_charge_current(struct bq2415x_device *bq, int mA)
632 + if (bq->init_data.resistor_sense <= 0)
635 + val = (mA * bq->init_data.resistor_sense - 37400) / 6800;
642 + return bq2415x_i2c_write_mask(bq, BQ2415X_REG_CURRENT, val,
643 + BQ2415X_MASK_VI_CHRG | BQ2415X_MASK_RESET,
644 + BQ2415X_SHIFT_VI_CHRG);
647 +/* get charge current in mA (platform data must provide resistor sense) */
648 +static int bq2415x_get_charge_current(struct bq2415x_device *bq)
651 + if (bq->init_data.resistor_sense <= 0)
654 + ret = bq2415x_i2c_read_mask(bq, BQ2415X_REG_CURRENT,
655 + BQ2415X_MASK_VI_CHRG, BQ2415X_SHIFT_VI_CHRG);
659 + return (37400 + 6800*ret) / bq->init_data.resistor_sense;
662 +/* set termination current in mA (platform data must provide resistor sense) */
663 +static int bq2415x_set_termination_current(struct bq2415x_device *bq, int mA)
666 + if (bq->init_data.resistor_sense <= 0)
669 + val = (mA * bq->init_data.resistor_sense - 3400) / 3400;
676 + return bq2415x_i2c_write_mask(bq, BQ2415X_REG_CURRENT, val,
677 + BQ2415X_MASK_VI_TERM | BQ2415X_MASK_RESET,
678 + BQ2415X_SHIFT_VI_TERM);
681 +/* get termination current in mA (platform data must provide resistor sense) */
682 +static int bq2415x_get_termination_current(struct bq2415x_device *bq)
685 + if (bq->init_data.resistor_sense <= 0)
688 + ret = bq2415x_i2c_read_mask(bq, BQ2415X_REG_CURRENT,
689 + BQ2415X_MASK_VI_TERM, BQ2415X_SHIFT_VI_TERM);
693 + return (3400 + 3400*ret) / bq->init_data.resistor_sense;
696 +/* set default value of property */
697 +#define bq2415x_set_default_value(bq, prop) \
700 + if (bq->init_data.prop != -1) \
701 + ret = bq2415x_set_##prop(bq, bq->init_data.prop); \
706 +/* set default values of all properties */
707 +static int bq2415x_set_defaults(struct bq2415x_device *bq)
709 + bq2415x_exec_command(bq, BQ2415X_BOOST_MODE_DISABLE);
710 + bq2415x_exec_command(bq, BQ2415X_CHARGER_DISABLE);
711 + bq2415x_exec_command(bq, BQ2415X_CHARGE_TERMINATION_DISABLE);
712 + bq2415x_set_default_value(bq, current_limit);
713 + bq2415x_set_default_value(bq, weak_battery_voltage);
714 + bq2415x_set_default_value(bq, battery_regulation_voltage);
715 + if (bq->init_data.resistor_sense > 0) {
716 + bq2415x_set_default_value(bq, charge_current);
717 + bq2415x_set_default_value(bq, termination_current);
718 + bq2415x_exec_command(bq, BQ2415X_CHARGE_TERMINATION_ENABLE);
720 + bq2415x_exec_command(bq, BQ2415X_CHARGER_ENABLE);
724 +/**** charger mode functions ****/
726 +/* set charger mode */
727 +static int bq2415x_set_mode(struct bq2415x_device *bq, enum bq2415x_mode mode)
733 + if (mode == BQ2415X_MODE_HOST_CHARGER ||
734 + mode == BQ2415X_MODE_DEDICATED_CHARGER)
737 + if (mode == BQ2415X_MODE_BOOST)
741 + ret = bq2415x_exec_command(bq, BQ2415X_CHARGER_DISABLE);
744 + ret = bq2415x_exec_command(bq, BQ2415X_BOOST_MODE_DISABLE);
750 + case BQ2415X_MODE_NONE:
751 + dev_dbg(bq->dev, "changing mode to: N/A\n");
752 + ret = bq2415x_set_current_limit(bq, 100);
754 + case BQ2415X_MODE_HOST_CHARGER:
755 + dev_dbg(bq->dev, "changing mode to: Host/HUB charger\n");
756 + ret = bq2415x_set_current_limit(bq, 500);
758 + case BQ2415X_MODE_DEDICATED_CHARGER:
759 + dev_dbg(bq->dev, "changing mode to: Dedicated charger\n");
760 + ret = bq2415x_set_current_limit(bq, 1800);
762 + case BQ2415X_MODE_BOOST: /* Boost mode */
763 + dev_dbg(bq->dev, "changing mode to: Boost\n");
764 + ret = bq2415x_set_current_limit(bq, 100);
772 + ret = bq2415x_exec_command(bq, BQ2415X_CHARGER_ENABLE);
774 + ret = bq2415x_exec_command(bq, BQ2415X_BOOST_MODE_ENABLE);
779 + bq2415x_set_default_value(bq, weak_battery_voltage);
780 + bq2415x_set_default_value(bq, battery_regulation_voltage);
783 + sysfs_notify(&bq->charger.dev->kobj, NULL, "mode");
789 +/* hook function called by other driver which set reported mode */
790 +static void bq2415x_hook_function(enum bq2415x_mode mode, void *data)
792 + struct bq2415x_device *bq = data;
797 + dev_dbg(bq->dev, "hook function was called\n");
798 + bq->reported_mode = mode;
800 + /* if automode is not enabled do not tell about reported_mode */
801 + if (bq->automode < 1)
804 + sysfs_notify(&bq->charger.dev->kobj, NULL, "reported_mode");
805 + bq2415x_set_mode(bq, bq->reported_mode);
809 +/**** timer functions ****/
811 +/* enable/disable auto resetting chip timer */
812 +static void bq2415x_set_autotimer(struct bq2415x_device *bq, int state)
814 + mutex_lock(&bq2415x_timer_mutex);
816 + if (bq->autotimer == state) {
817 + mutex_unlock(&bq2415x_timer_mutex);
821 + bq->autotimer = state;
824 + schedule_delayed_work(&bq->work, BQ2415X_TIMER_TIMEOUT * HZ);
825 + bq2415x_exec_command(bq, BQ2415X_TIMER_RESET);
826 + bq->timer_error = NULL;
828 + cancel_delayed_work_sync(&bq->work);
831 + mutex_unlock(&bq2415x_timer_mutex);
834 +/* called by bq2415x_timer_work on timer error */
835 +static void bq2415x_timer_error(struct bq2415x_device *bq, const char *msg)
837 + bq->timer_error = msg;
838 + sysfs_notify(&bq->charger.dev->kobj, NULL, "timer");
839 + dev_err(bq->dev, "%s\n", msg);
840 + if (bq->automode > 0)
842 + bq2415x_set_mode(bq, BQ2415X_MODE_NONE);
843 + bq2415x_set_autotimer(bq, 0);
846 +/* delayed work function for auto resetting chip timer */
847 +static void bq2415x_timer_work(struct work_struct *work)
849 + struct bq2415x_device *bq = container_of(work, struct bq2415x_device,
851 + int ret, error, boost;
853 + if (!bq->autotimer)
856 + ret = bq2415x_exec_command(bq, BQ2415X_TIMER_RESET);
858 + bq2415x_timer_error(bq, "Resetting timer failed");
862 + boost = bq2415x_exec_command(bq, BQ2415X_BOOST_MODE_STATUS);
864 + bq2415x_timer_error(bq, "Unknown error");
868 + error = bq2415x_exec_command(bq, BQ2415X_FAULT_STATUS);
870 + bq2415x_timer_error(bq, "Unknown error");
876 + /* Non fatal errors, chip is OK */
877 + case 0: /* No error */
879 + case 6: /* Timer expired */
880 + dev_err(bq->dev, "Timer expired\n");
882 + case 3: /* Battery voltage too low */
883 + dev_err(bq->dev, "Battery voltage to low\n");
886 + /* Fatal errors, disable and reset chip */
887 + case 1: /* Overvoltage protection (chip fried) */
888 + bq2415x_timer_error(bq,
889 + "Overvoltage protection (chip fried)");
891 + case 2: /* Overload */
892 + bq2415x_timer_error(bq, "Overload");
894 + case 4: /* Battery overvoltage protection */
895 + bq2415x_timer_error(bq,
896 + "Battery overvoltage protection");
898 + case 5: /* Thermal shutdown (too hot) */
899 + bq2415x_timer_error(bq,
900 + "Thermal shutdown (too hot)");
903 + bq2415x_timer_error(bq, "Unknown error");
908 + /* Non fatal errors, chip is OK */
909 + case 0: /* No error */
911 + case 2: /* Sleep mode */
912 + dev_err(bq->dev, "Sleep mode\n");
914 + case 3: /* Poor input source */
915 + dev_err(bq->dev, "Poor input source\n");
917 + case 6: /* Timer expired */
918 + dev_err(bq->dev, "Timer expired\n");
920 + case 7: /* No battery */
921 + dev_err(bq->dev, "No battery\n");
924 + /* Fatal errors, disable and reset chip */
925 + case 1: /* Overvoltage protection (chip fried) */
926 + bq2415x_timer_error(bq,
927 + "Overvoltage protection (chip fried)");
929 + case 4: /* Battery overvoltage protection */
930 + bq2415x_timer_error(bq,
931 + "Battery overvoltage protection");
933 + case 5: /* Thermal shutdown (too hot) */
934 + bq2415x_timer_error(bq,
935 + "Thermal shutdown (too hot)");
940 + schedule_delayed_work(&bq->work, BQ2415X_TIMER_TIMEOUT * HZ);
943 +/**** power supply interface code ****/
945 +static enum power_supply_property bq2415x_power_supply_props[] = {
946 + /* TODO: maybe add more power supply properties */
947 + POWER_SUPPLY_PROP_STATUS,
948 + POWER_SUPPLY_PROP_MODEL_NAME,
951 +static int bq2415x_power_supply_get_property(struct power_supply *psy,
952 + enum power_supply_property psp, union power_supply_propval *val)
954 + struct bq2415x_device *bq = container_of(psy, struct bq2415x_device,
959 + case POWER_SUPPLY_PROP_STATUS:
960 + ret = bq2415x_exec_command(bq, BQ2415X_CHARGE_STATUS);
963 + else if (ret == 0) /* Ready */
964 + val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
965 + else if (ret == 1) /* Charge in progress */
966 + val->intval = POWER_SUPPLY_STATUS_CHARGING;
967 + else if (ret == 2) /* Charge done */
968 + val->intval = POWER_SUPPLY_STATUS_FULL;
970 + val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
972 + case POWER_SUPPLY_PROP_MODEL_NAME:
973 + val->strval = bq->model;
981 +static int bq2415x_power_supply_init(struct bq2415x_device *bq)
987 + bq->charger.name = bq->name;
988 + bq->charger.type = POWER_SUPPLY_TYPE_USB;
989 + bq->charger.properties = bq2415x_power_supply_props;
990 + bq->charger.num_properties = ARRAY_SIZE(bq2415x_power_supply_props);
991 + bq->charger.get_property = bq2415x_power_supply_get_property;
993 + ret = bq2415x_detect_chip(bq);
999 + ret = bq2415x_detect_revision(bq);
1001 + strcpy(revstr, "unknown");
1003 + sprintf(revstr, "1.%d", ret);
1005 + bq->model = kasprintf(GFP_KERNEL,
1006 + "chip %s, revision %s, vender code %.3d",
1007 + bq2415x_chip_name[chip], revstr,
1008 + bq2415x_get_vender_code(bq));
1010 + dev_err(bq->dev, "failed to allocate model name\n");
1014 + ret = power_supply_register(bq->dev, &bq->charger);
1023 +static void bq2415x_power_supply_exit(struct bq2415x_device *bq)
1025 + bq->autotimer = 0;
1026 + if (bq->automode > 0)
1028 + cancel_delayed_work_sync(&bq->work);
1029 + power_supply_unregister(&bq->charger);
1033 +/**** additional sysfs entries for power supply interface ****/
1035 +/* show *_status entries */
1036 +static ssize_t bq2415x_sysfs_show_status(struct device *dev,
1037 + struct device_attribute *attr, char *buf)
1039 + struct power_supply *psy = dev_get_drvdata(dev);
1040 + struct bq2415x_device *bq = container_of(psy, struct bq2415x_device,
1042 + enum bq2415x_command command;
1045 + if (strcmp(attr->attr.name, "otg_status") == 0)
1046 + command = BQ2415X_OTG_STATUS;
1047 + else if (strcmp(attr->attr.name, "charge_status") == 0)
1048 + command = BQ2415X_CHARGE_STATUS;
1049 + else if (strcmp(attr->attr.name, "boost_status") == 0)
1050 + command = BQ2415X_BOOST_STATUS;
1051 + else if (strcmp(attr->attr.name, "fault_status") == 0)
1052 + command = BQ2415X_FAULT_STATUS;
1056 + ret = bq2415x_exec_command(bq, command);
1060 + return sprintf(buf, "%d\n", ret);
1063 +/* set timer entry:
1064 + auto - enable auto mode
1065 + off - disable auto mode
1066 + (other values) - reset chip timer
1068 +static ssize_t bq2415x_sysfs_set_timer(struct device *dev,
1069 + struct device_attribute *attr, const char *buf, size_t count)
1071 + struct power_supply *psy = dev_get_drvdata(dev);
1072 + struct bq2415x_device *bq = container_of(psy, struct bq2415x_device,
1076 + if (strncmp(buf, "auto", 4) == 0)
1077 + bq2415x_set_autotimer(bq, 1);
1078 + else if (strncmp(buf, "off", 3) == 0)
1079 + bq2415x_set_autotimer(bq, 0);
1081 + ret = bq2415x_exec_command(bq, BQ2415X_TIMER_RESET);
1089 +/* show timer entry (auto or off) */
1090 +static ssize_t bq2415x_sysfs_show_timer(struct device *dev,
1091 + struct device_attribute *attr, char *buf)
1093 + struct power_supply *psy = dev_get_drvdata(dev);
1094 + struct bq2415x_device *bq = container_of(psy, struct bq2415x_device,
1097 + if (bq->timer_error)
1098 + return sprintf(buf, "%s\n", bq->timer_error);
1100 + if (bq->autotimer)
1101 + return sprintf(buf, "auto\n");
1103 + return sprintf(buf, "off\n");
1107 + auto - if automode is supported, enable it and set mode to reported
1108 + none - disable charger and boost mode
1109 + host - charging mode for host/hub chargers (current limit 500mA)
1110 + dedicated - charging mode for dedicated chargers (unlimited current limit)
1111 + boost - disable charger and enable boost mode
1113 +static ssize_t bq2415x_sysfs_set_mode(struct device *dev,
1114 + struct device_attribute *attr, const char *buf, size_t count)
1116 + struct power_supply *psy = dev_get_drvdata(dev);
1117 + struct bq2415x_device *bq = container_of(psy, struct bq2415x_device,
1119 + enum bq2415x_mode mode;
1122 + if (strncmp(buf, "auto", 4) == 0) {
1123 + if (bq->automode < 0)
1126 + mode = bq->reported_mode;
1127 + } else if (strncmp(buf, "none", 4) == 0) {
1128 + if (bq->automode > 0)
1130 + mode = BQ2415X_MODE_NONE;
1131 + } else if (strncmp(buf, "host", 4) == 0) {
1132 + if (bq->automode > 0)
1134 + mode = BQ2415X_MODE_HOST_CHARGER;
1135 + } else if (strncmp(buf, "dedicated", 9) == 0) {
1136 + if (bq->automode > 0)
1138 + mode = BQ2415X_MODE_DEDICATED_CHARGER;
1139 + } else if (strncmp(buf, "boost", 5) == 0) {
1140 + if (bq->automode > 0)
1142 + mode = BQ2415X_MODE_BOOST;
1143 + } else if (strncmp(buf, "reset", 5) == 0) {
1144 + bq2415x_reset_chip(bq);
1145 + bq2415x_set_defaults(bq);
1146 + if (bq->automode <= 0)
1149 + mode = bq->reported_mode;
1153 + ret = bq2415x_set_mode(bq, mode);
1160 +/* show mode entry (auto, none, host, dedicated or boost) */
1161 +static ssize_t bq2415x_sysfs_show_mode(struct device *dev,
1162 + struct device_attribute *attr, char *buf)
1164 + struct power_supply *psy = dev_get_drvdata(dev);
1165 + struct bq2415x_device *bq = container_of(psy, struct bq2415x_device,
1169 + if (bq->automode > 0)
1170 + ret += sprintf(buf+ret, "auto (");
1172 + switch (bq->mode) {
1173 + case BQ2415X_MODE_NONE:
1174 + ret += sprintf(buf+ret, "none");
1176 + case BQ2415X_MODE_HOST_CHARGER:
1177 + ret += sprintf(buf+ret, "host");
1179 + case BQ2415X_MODE_DEDICATED_CHARGER:
1180 + ret += sprintf(buf+ret, "dedicated");
1182 + case BQ2415X_MODE_BOOST:
1183 + ret += sprintf(buf+ret, "boost");
1187 + if (bq->automode > 0)
1188 + ret += sprintf(buf+ret, ")");
1190 + ret += sprintf(buf+ret, "\n");
1194 +/* show reported_mode entry (none, host, dedicated or boost) */
1195 +static ssize_t bq2415x_sysfs_show_reported_mode(struct device *dev,
1196 + struct device_attribute *attr, char *buf)
1198 + struct power_supply *psy = dev_get_drvdata(dev);
1199 + struct bq2415x_device *bq = container_of(psy, struct bq2415x_device,
1202 + if (bq->automode < 0)
1205 + switch (bq->reported_mode) {
1206 + case BQ2415X_MODE_NONE:
1207 + return sprintf(buf, "none\n");
1208 + case BQ2415X_MODE_HOST_CHARGER:
1209 + return sprintf(buf, "host\n");
1210 + case BQ2415X_MODE_DEDICATED_CHARGER:
1211 + return sprintf(buf, "dedicated\n");
1212 + case BQ2415X_MODE_BOOST:
1213 + return sprintf(buf, "boost\n");
1219 +/* directly set raw value to chip register, format: 'register value' */
1220 +static ssize_t bq2415x_sysfs_set_registers(struct device *dev,
1221 + struct device_attribute *attr, const char *buf, size_t count)
1223 + struct power_supply *psy = dev_get_drvdata(dev);
1224 + struct bq2415x_device *bq = container_of(psy, struct bq2415x_device,
1230 + if (sscanf(buf, "%x %x", ®, &val) != 2)
1233 + if (reg > 4 || val > 255)
1236 + ret = bq2415x_i2c_write(bq, reg, val);
1243 +/* print value of chip register, format: 'register=value' */
1244 +static ssize_t bq2415x_sysfs_print_reg(struct bq2415x_device *bq,
1245 + u8 reg, char *buf)
1247 + int ret = bq2415x_i2c_read(bq, reg);
1249 + return sprintf(buf, "%#.2x=error %d\n", reg, ret);
1251 + return sprintf(buf, "%#.2x=%#.2x\n", reg, ret);
1254 +/* show all raw values of chip register, format per line: 'register=value' */
1255 +static ssize_t bq2415x_sysfs_show_registers(struct device *dev,
1256 + struct device_attribute *attr, char *buf)
1258 + struct power_supply *psy = dev_get_drvdata(dev);
1259 + struct bq2415x_device *bq = container_of(psy, struct bq2415x_device,
1263 + ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_STATUS, buf+ret);
1264 + ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_CONTROL, buf+ret);
1265 + ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_VOLTAGE, buf+ret);
1266 + ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_VENDER, buf+ret);
1267 + ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_CURRENT, buf+ret);
1271 +/* set current and voltage limit entries (in mA or mV) */
1272 +static ssize_t bq2415x_sysfs_set_limit(struct device *dev,
1273 + struct device_attribute *attr, const char *buf, size_t count)
1275 + struct power_supply *psy = dev_get_drvdata(dev);
1276 + struct bq2415x_device *bq = container_of(psy, struct bq2415x_device,
1281 + if (kstrtol(buf, 10, &val) < 0)
1284 + if (strcmp(attr->attr.name, "current_limit") == 0)
1285 + ret = bq2415x_set_current_limit(bq, val);
1286 + else if (strcmp(attr->attr.name, "weak_battery_voltage") == 0)
1287 + ret = bq2415x_set_weak_battery_voltage(bq, val);
1288 + else if (strcmp(attr->attr.name, "battery_regulation_voltage") == 0)
1289 + ret = bq2415x_set_battery_regulation_voltage(bq, val);
1290 + else if (strcmp(attr->attr.name, "charge_current") == 0)
1291 + ret = bq2415x_set_charge_current(bq, val);
1292 + else if (strcmp(attr->attr.name, "termination_current") == 0)
1293 + ret = bq2415x_set_termination_current(bq, val);
1303 +/* show current and voltage limit entries (in mA or mV) */
1304 +static ssize_t bq2415x_sysfs_show_limit(struct device *dev,
1305 + struct device_attribute *attr, char *buf)
1307 + struct power_supply *psy = dev_get_drvdata(dev);
1308 + struct bq2415x_device *bq = container_of(psy, struct bq2415x_device,
1312 + if (strcmp(attr->attr.name, "current_limit") == 0)
1313 + ret = bq2415x_get_current_limit(bq);
1314 + else if (strcmp(attr->attr.name, "weak_battery_voltage") == 0)
1315 + ret = bq2415x_get_weak_battery_voltage(bq);
1316 + else if (strcmp(attr->attr.name, "battery_regulation_voltage") == 0)
1317 + ret = bq2415x_get_battery_regulation_voltage(bq);
1318 + else if (strcmp(attr->attr.name, "charge_current") == 0)
1319 + ret = bq2415x_get_charge_current(bq);
1320 + else if (strcmp(attr->attr.name, "termination_current") == 0)
1321 + ret = bq2415x_get_termination_current(bq);
1328 + return sprintf(buf, "%d\n", ret);
1331 +/* set *_enable entries */
1332 +static ssize_t bq2415x_sysfs_set_enable(struct device *dev,
1333 + struct device_attribute *attr, const char *buf, size_t count)
1335 + struct power_supply *psy = dev_get_drvdata(dev);
1336 + struct bq2415x_device *bq = container_of(psy, struct bq2415x_device,
1338 + enum bq2415x_command command;
1342 + if (kstrtol(buf, 10, &val) < 0)
1345 + if (strcmp(attr->attr.name, "charge_termination_enable") == 0)
1346 + command = val ? BQ2415X_CHARGE_TERMINATION_ENABLE :
1347 + BQ2415X_CHARGE_TERMINATION_DISABLE;
1348 + else if (strcmp(attr->attr.name, "high_impedance_enable") == 0)
1349 + command = val ? BQ2415X_HIGH_IMPEDANCE_ENABLE :
1350 + BQ2415X_HIGH_IMPEDANCE_DISABLE;
1351 + else if (strcmp(attr->attr.name, "otg_pin_enable") == 0)
1352 + command = val ? BQ2415X_OTG_PIN_ENABLE :
1353 + BQ2415X_OTG_PIN_DISABLE;
1354 + else if (strcmp(attr->attr.name, "stat_pin_enable") == 0)
1355 + command = val ? BQ2415X_STAT_PIN_ENABLE :
1356 + BQ2415X_STAT_PIN_DISABLE;
1360 + ret = bq2415x_exec_command(bq, command);
1367 +/* show *_enable entries */
1368 +static ssize_t bq2415x_sysfs_show_enable(struct device *dev,
1369 + struct device_attribute *attr, char *buf)
1371 + struct power_supply *psy = dev_get_drvdata(dev);
1372 + struct bq2415x_device *bq = container_of(psy, struct bq2415x_device,
1374 + enum bq2415x_command command;
1377 + if (strcmp(attr->attr.name, "charge_termination_enable") == 0)
1378 + command = BQ2415X_CHARGE_TERMINATION_STATUS;
1379 + else if (strcmp(attr->attr.name, "high_impedance_enable") == 0)
1380 + command = BQ2415X_HIGH_IMPEDANCE_STATUS;
1381 + else if (strcmp(attr->attr.name, "otg_pin_enable") == 0)
1382 + command = BQ2415X_OTG_PIN_STATUS;
1383 + else if (strcmp(attr->attr.name, "stat_pin_enable") == 0)
1384 + command = BQ2415X_STAT_PIN_STATUS;
1388 + ret = bq2415x_exec_command(bq, command);
1392 + return sprintf(buf, "%d\n", ret);
1395 +static DEVICE_ATTR(current_limit, S_IWUSR | S_IRUGO,
1396 + bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit);
1397 +static DEVICE_ATTR(weak_battery_voltage, S_IWUSR | S_IRUGO,
1398 + bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit);
1399 +static DEVICE_ATTR(battery_regulation_voltage, S_IWUSR | S_IRUGO,
1400 + bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit);
1401 +static DEVICE_ATTR(charge_current, S_IWUSR | S_IRUGO,
1402 + bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit);
1403 +static DEVICE_ATTR(termination_current, S_IWUSR | S_IRUGO,
1404 + bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit);
1406 +static DEVICE_ATTR(charge_termination_enable, S_IWUSR | S_IRUGO,
1407 + bq2415x_sysfs_show_enable, bq2415x_sysfs_set_enable);
1408 +static DEVICE_ATTR(high_impedance_enable, S_IWUSR | S_IRUGO,
1409 + bq2415x_sysfs_show_enable, bq2415x_sysfs_set_enable);
1410 +static DEVICE_ATTR(otg_pin_enable, S_IWUSR | S_IRUGO,
1411 + bq2415x_sysfs_show_enable, bq2415x_sysfs_set_enable);
1412 +static DEVICE_ATTR(stat_pin_enable, S_IWUSR | S_IRUGO,
1413 + bq2415x_sysfs_show_enable, bq2415x_sysfs_set_enable);
1415 +static DEVICE_ATTR(reported_mode, S_IRUGO,
1416 + bq2415x_sysfs_show_reported_mode, NULL);
1417 +static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO,
1418 + bq2415x_sysfs_show_mode, bq2415x_sysfs_set_mode);
1419 +static DEVICE_ATTR(timer, S_IWUSR | S_IRUGO,
1420 + bq2415x_sysfs_show_timer, bq2415x_sysfs_set_timer);
1422 +static DEVICE_ATTR(registers, S_IWUSR | S_IRUGO,
1423 + bq2415x_sysfs_show_registers, bq2415x_sysfs_set_registers);
1425 +static DEVICE_ATTR(otg_status, S_IRUGO, bq2415x_sysfs_show_status, NULL);
1426 +static DEVICE_ATTR(charge_status, S_IRUGO, bq2415x_sysfs_show_status, NULL);
1427 +static DEVICE_ATTR(boost_status, S_IRUGO, bq2415x_sysfs_show_status, NULL);
1428 +static DEVICE_ATTR(fault_status, S_IRUGO, bq2415x_sysfs_show_status, NULL);
1430 +static struct attribute *bq2415x_sysfs_attributes[] = {
1431 + &dev_attr_current_limit.attr,
1432 + &dev_attr_weak_battery_voltage.attr,
1433 + &dev_attr_battery_regulation_voltage.attr,
1434 + &dev_attr_charge_current.attr,
1435 + &dev_attr_termination_current.attr,
1437 + &dev_attr_charge_termination_enable.attr,
1438 + &dev_attr_high_impedance_enable.attr,
1439 + &dev_attr_otg_pin_enable.attr,
1440 + &dev_attr_stat_pin_enable.attr,
1442 + &dev_attr_reported_mode.attr,
1443 + &dev_attr_mode.attr,
1444 + &dev_attr_timer.attr,
1446 + &dev_attr_registers.attr,
1448 + &dev_attr_otg_status.attr,
1449 + &dev_attr_charge_status.attr,
1450 + &dev_attr_boost_status.attr,
1451 + &dev_attr_fault_status.attr,
1455 +static const struct attribute_group bq2415x_sysfs_attr_group = {
1456 + .attrs = bq2415x_sysfs_attributes,
1459 +static int bq2415x_sysfs_init(struct bq2415x_device *bq)
1461 + return sysfs_create_group(&bq->charger.dev->kobj,
1462 + &bq2415x_sysfs_attr_group);
1465 +static void bq2415x_sysfs_exit(struct bq2415x_device *bq)
1467 + sysfs_remove_group(&bq->charger.dev->kobj, &bq2415x_sysfs_attr_group);
1470 +/* main bq2415x probe function */
1471 +static int bq2415x_probe(struct i2c_client *client,
1472 + const struct i2c_device_id *id)
1477 + struct bq2415x_device *bq;
1479 + if (!client->dev.platform_data) {
1480 + dev_err(&client->dev, "platform data not set\n");
1484 + /* Get new ID for the new device */
1485 + ret = idr_pre_get(&bq2415x_id, GFP_KERNEL);
1489 + mutex_lock(&bq2415x_id_mutex);
1490 + ret = idr_get_new(&bq2415x_id, client, &num);
1491 + mutex_unlock(&bq2415x_id_mutex);
1496 + name = kasprintf(GFP_KERNEL, "%s-%d", id->name, num);
1498 + dev_err(&client->dev, "failed to allocate device name\n");
1503 + bq = kzalloc(sizeof(*bq), GFP_KERNEL);
1505 + dev_err(&client->dev, "failed to allocate device data\n");
1510 + i2c_set_clientdata(client, bq);
1513 + bq->dev = &client->dev;
1514 + bq->chip = id->driver_data;
1516 + bq->mode = BQ2415X_MODE_NONE;
1517 + bq->reported_mode = BQ2415X_MODE_NONE;
1518 + bq->autotimer = 0;
1521 + memcpy(&bq->init_data, client->dev.platform_data,
1522 + sizeof(bq->init_data));
1524 + bq2415x_reset_chip(bq);
1526 + ret = bq2415x_power_supply_init(bq);
1528 + dev_err(bq->dev, "failed to register power supply: %d\n", ret);
1532 + ret = bq2415x_sysfs_init(bq);
1534 + dev_err(bq->dev, "failed to create sysfs entries: %d\n", ret);
1538 + ret = bq2415x_set_defaults(bq);
1540 + dev_err(bq->dev, "failed to set default values: %d\n", ret);
1544 + if (bq->init_data.set_mode_hook) {
1545 + if (bq->init_data.set_mode_hook(
1546 + bq2415x_hook_function, bq)) {
1548 + bq2415x_set_mode(bq, bq->reported_mode);
1549 + dev_info(bq->dev, "automode enabled\n");
1551 + bq->automode = -1;
1552 + dev_info(bq->dev, "automode failed\n");
1555 + bq->automode = -1;
1556 + dev_info(bq->dev, "automode not supported\n");
1559 + INIT_DELAYED_WORK(&bq->work, bq2415x_timer_work);
1560 + bq2415x_set_autotimer(bq, 1);
1562 + dev_info(bq->dev, "driver registered\n");
1566 + bq2415x_sysfs_exit(bq);
1568 + bq2415x_power_supply_exit(bq);
1574 + mutex_lock(&bq2415x_id_mutex);
1575 + idr_remove(&bq2415x_id, num);
1576 + mutex_unlock(&bq2415x_id_mutex);
1581 +/* main bq2415x remove function */
1583 +static int bq2415x_remove(struct i2c_client *client)
1585 + struct bq2415x_device *bq = i2c_get_clientdata(client);
1587 + if (bq->init_data.set_mode_hook)
1588 + bq->init_data.set_mode_hook(NULL, NULL);
1590 + bq2415x_sysfs_exit(bq);
1591 + bq2415x_power_supply_exit(bq);
1593 + bq2415x_reset_chip(bq);
1595 + mutex_lock(&bq2415x_id_mutex);
1596 + idr_remove(&bq2415x_id, bq->id);
1597 + mutex_unlock(&bq2415x_id_mutex);
1599 + dev_info(bq->dev, "driver unregistered\n");
1607 +static const struct i2c_device_id bq2415x_i2c_id_table[] = {
1608 + { "bq2415x", BQUNKNOWN },
1609 + { "bq24150", BQ24150 },
1610 + { "bq24150a", BQ24150A },
1611 + { "bq24151", BQ24151 },
1612 + { "bq24151a", BQ24151A },
1613 + { "bq24152", BQ24152 },
1614 + { "bq24153", BQ24153 },
1615 + { "bq24153a", BQ24153A },
1616 + { "bq24155", BQ24155 },
1617 + { "bq24156", BQ24156 },
1618 + { "bq24156a", BQ24156A },
1619 + { "bq24158", BQ24158 },
1622 +MODULE_DEVICE_TABLE(i2c, bq2415x_i2c_id_table);
1624 +static struct i2c_driver bq2415x_driver = {
1626 + .name = "bq2415x-charger",
1628 + .probe = bq2415x_probe,
1629 + .remove = bq2415x_remove,
1630 + .id_table = bq2415x_i2c_id_table,
1633 +static int __init bq2415x_init(void)
1635 + return i2c_add_driver(&bq2415x_driver);
1637 +module_init(bq2415x_init);
1639 +static void __exit bq2415x_exit(void)
1641 + i2c_del_driver(&bq2415x_driver);
1643 +module_exit(bq2415x_exit);
1645 +MODULE_AUTHOR("Pali Rohár <pali.rohar@gmail.com>");
1646 +MODULE_DESCRIPTION("bq2415x charger driver");
1647 +MODULE_LICENSE("GPL");
1649 +++ kernel-power/include/linux/power/bq2415x_charger.h
1652 + bq2415x_charger.h - bq2415x charger driver
1653 + Copyright (C) 2011-2012 Pali Rohár <pali.rohar@gmail.com>
1655 + This program is free software; you can redistribute it and/or modify
1656 + it under the terms of the GNU General Public License as published by
1657 + the Free Software Foundation; either version 2 of the License, or
1658 + (at your option) any later version.
1660 + This program is distributed in the hope that it will be useful,
1661 + but WITHOUT ANY WARRANTY; without even the implied warranty of
1662 + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1663 + GNU General Public License for more details.
1665 + You should have received a copy of the GNU General Public License along
1666 + with this program; if not, write to the Free Software Foundation, Inc.,
1667 + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
1670 +#ifndef BQ2415X_CHARGER_H
1671 +#define BQ2415X_CHARGER_H
1674 + This is platform data for bq2415x chip. It contains default board voltages
1675 + and currents which can be also later configured via sysfs. If value is -1
1676 + then default chip value (specified in datasheet) will be used.
1678 + Value resistor_sense is needed for for configuring charge and termination
1679 + current. It it is less or equal to zero, configuring charge and termination
1680 + current will not be possible.
1682 + Function set_mode_hook is needed for automode (setting correct current limit
1683 + when charger is connected/disconnected or setting boost mode). When is NULL,
1684 + automode function is disabled. When is not NULL, it must have this prototype:
1686 + int (*set_mode_hook)(
1687 + void (*hook)(enum bq2415x_mode mode, void *data),
1690 + hook is hook function (see below) and data is pointer to driver private data
1692 + bq2415x driver will call it as:
1694 + platform_data->set_mode_hook(bq2415x_hook_function, bq2415x_device);
1696 + Board/platform function set_mode_hook return non zero value when hook
1697 + function was successful registered. Platform code should call that hook
1698 + function (which get from pointer, with data) every time when charger was
1699 + connected/disconnected or require to enable boost mode. bq2415x driver then
1700 + will set correct current limit, enable/disable charger or boost mode.
1702 + Hook function has this prototype:
1704 + void hook(enum bq2415x_mode mode, void *data);
1706 + mode is bq2415x mode (charger or boost)
1707 + data is pointer to driver private data (which get from set_charger_type_hook)
1709 + When bq driver is being unloaded, it call function:
1711 + platform_data->set_mode_hook(NULL, NULL);
1713 + (hook function and driver private data are NULL)
1715 + After that board/platform code must not call driver hook function! It is
1716 + possible that pointer to hook function will not be valid and calling will
1717 + cause undefined result.
1721 +/* Supported modes with maximal current limit */
1722 +enum bq2415x_mode {
1723 + BQ2415X_MODE_NONE, /* unknown or no charger (100mA) */
1724 + BQ2415X_MODE_HOST_CHARGER, /* usb host/hub charger (500mA) */
1725 + BQ2415X_MODE_DEDICATED_CHARGER, /* dedicated charger (unlimited) */
1726 + BQ2415X_MODE_BOOST, /* boost mode (charging disabled) */
1729 +struct bq2415x_platform_data {
1730 + int current_limit; /* mA */
1731 + int weak_battery_voltage; /* mV */
1732 + int battery_regulation_voltage; /* mV */
1733 + int charge_current; /* mA */
1734 + int termination_current; /* mA */
1735 + int resistor_sense; /* m ohm */
1736 + int (*set_mode_hook)(void (*hook)(enum bq2415x_mode mode, void *data),