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913 lines
23 KiB
913 lines
23 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Intersil ISL1208 rtc class driver |
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* |
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* Copyright 2005,2006 Hebert Valerio Riedel <[email protected]> |
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*/ |
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#include <linux/bcd.h> |
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#include <linux/i2c.h> |
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#include <linux/module.h> |
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#include <linux/of_device.h> |
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#include <linux/of_irq.h> |
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#include <linux/rtc.h> |
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/* Register map */ |
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/* rtc section */ |
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#define ISL1208_REG_SC 0x00 |
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#define ISL1208_REG_MN 0x01 |
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#define ISL1208_REG_HR 0x02 |
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#define ISL1208_REG_HR_MIL (1<<7) /* 24h/12h mode */ |
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#define ISL1208_REG_HR_PM (1<<5) /* PM/AM bit in 12h mode */ |
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#define ISL1208_REG_DT 0x03 |
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#define ISL1208_REG_MO 0x04 |
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#define ISL1208_REG_YR 0x05 |
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#define ISL1208_REG_DW 0x06 |
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#define ISL1208_RTC_SECTION_LEN 7 |
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/* control/status section */ |
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#define ISL1208_REG_SR 0x07 |
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#define ISL1208_REG_SR_ARST (1<<7) /* auto reset */ |
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#define ISL1208_REG_SR_XTOSCB (1<<6) /* crystal oscillator */ |
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#define ISL1208_REG_SR_WRTC (1<<4) /* write rtc */ |
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#define ISL1208_REG_SR_EVT (1<<3) /* event */ |
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#define ISL1208_REG_SR_ALM (1<<2) /* alarm */ |
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#define ISL1208_REG_SR_BAT (1<<1) /* battery */ |
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#define ISL1208_REG_SR_RTCF (1<<0) /* rtc fail */ |
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#define ISL1208_REG_INT 0x08 |
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#define ISL1208_REG_INT_ALME (1<<6) /* alarm enable */ |
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#define ISL1208_REG_INT_IM (1<<7) /* interrupt/alarm mode */ |
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#define ISL1219_REG_EV 0x09 |
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#define ISL1219_REG_EV_EVEN (1<<4) /* event detection enable */ |
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#define ISL1219_REG_EV_EVIENB (1<<7) /* event in pull-up disable */ |
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#define ISL1208_REG_ATR 0x0a |
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#define ISL1208_REG_DTR 0x0b |
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/* alarm section */ |
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#define ISL1208_REG_SCA 0x0c |
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#define ISL1208_REG_MNA 0x0d |
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#define ISL1208_REG_HRA 0x0e |
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#define ISL1208_REG_DTA 0x0f |
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#define ISL1208_REG_MOA 0x10 |
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#define ISL1208_REG_DWA 0x11 |
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#define ISL1208_ALARM_SECTION_LEN 6 |
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/* user section */ |
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#define ISL1208_REG_USR1 0x12 |
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#define ISL1208_REG_USR2 0x13 |
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#define ISL1208_USR_SECTION_LEN 2 |
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/* event section */ |
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#define ISL1219_REG_SCT 0x14 |
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#define ISL1219_REG_MNT 0x15 |
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#define ISL1219_REG_HRT 0x16 |
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#define ISL1219_REG_DTT 0x17 |
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#define ISL1219_REG_MOT 0x18 |
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#define ISL1219_REG_YRT 0x19 |
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#define ISL1219_EVT_SECTION_LEN 6 |
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static struct i2c_driver isl1208_driver; |
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/* ISL1208 various variants */ |
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enum isl1208_id { |
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TYPE_ISL1208 = 0, |
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TYPE_ISL1209, |
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TYPE_ISL1218, |
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TYPE_ISL1219, |
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ISL_LAST_ID |
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}; |
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/* Chip capabilities table */ |
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static const struct isl1208_config { |
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const char name[8]; |
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unsigned int nvmem_length; |
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unsigned has_tamper:1; |
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unsigned has_timestamp:1; |
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} isl1208_configs[] = { |
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[TYPE_ISL1208] = { "isl1208", 2, false, false }, |
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[TYPE_ISL1209] = { "isl1209", 2, true, false }, |
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[TYPE_ISL1218] = { "isl1218", 8, false, false }, |
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[TYPE_ISL1219] = { "isl1219", 2, true, true }, |
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}; |
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static const struct i2c_device_id isl1208_id[] = { |
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{ "isl1208", TYPE_ISL1208 }, |
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{ "isl1209", TYPE_ISL1209 }, |
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{ "isl1218", TYPE_ISL1218 }, |
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{ "isl1219", TYPE_ISL1219 }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(i2c, isl1208_id); |
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static const __maybe_unused struct of_device_id isl1208_of_match[] = { |
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{ .compatible = "isil,isl1208", .data = &isl1208_configs[TYPE_ISL1208] }, |
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{ .compatible = "isil,isl1209", .data = &isl1208_configs[TYPE_ISL1209] }, |
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{ .compatible = "isil,isl1218", .data = &isl1208_configs[TYPE_ISL1218] }, |
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{ .compatible = "isil,isl1219", .data = &isl1208_configs[TYPE_ISL1219] }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(of, isl1208_of_match); |
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/* Device state */ |
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struct isl1208_state { |
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struct nvmem_config nvmem_config; |
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struct rtc_device *rtc; |
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const struct isl1208_config *config; |
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}; |
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/* block read */ |
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static int |
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isl1208_i2c_read_regs(struct i2c_client *client, u8 reg, u8 buf[], |
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unsigned len) |
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{ |
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int ret; |
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WARN_ON(reg > ISL1219_REG_YRT); |
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WARN_ON(reg + len > ISL1219_REG_YRT + 1); |
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ret = i2c_smbus_read_i2c_block_data(client, reg, len, buf); |
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return (ret < 0) ? ret : 0; |
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} |
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/* block write */ |
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static int |
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isl1208_i2c_set_regs(struct i2c_client *client, u8 reg, u8 const buf[], |
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unsigned len) |
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{ |
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int ret; |
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WARN_ON(reg > ISL1219_REG_YRT); |
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WARN_ON(reg + len > ISL1219_REG_YRT + 1); |
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ret = i2c_smbus_write_i2c_block_data(client, reg, len, buf); |
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return (ret < 0) ? ret : 0; |
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} |
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/* simple check to see whether we have a isl1208 */ |
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static int |
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isl1208_i2c_validate_client(struct i2c_client *client) |
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{ |
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u8 regs[ISL1208_RTC_SECTION_LEN] = { 0, }; |
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u8 zero_mask[ISL1208_RTC_SECTION_LEN] = { |
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0x80, 0x80, 0x40, 0xc0, 0xe0, 0x00, 0xf8 |
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}; |
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int i; |
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int ret; |
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ret = isl1208_i2c_read_regs(client, 0, regs, ISL1208_RTC_SECTION_LEN); |
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if (ret < 0) |
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return ret; |
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for (i = 0; i < ISL1208_RTC_SECTION_LEN; ++i) { |
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if (regs[i] & zero_mask[i]) /* check if bits are cleared */ |
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return -ENODEV; |
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} |
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return 0; |
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} |
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static int |
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isl1208_i2c_get_sr(struct i2c_client *client) |
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{ |
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return i2c_smbus_read_byte_data(client, ISL1208_REG_SR); |
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} |
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static int |
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isl1208_i2c_get_atr(struct i2c_client *client) |
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{ |
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int atr = i2c_smbus_read_byte_data(client, ISL1208_REG_ATR); |
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if (atr < 0) |
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return atr; |
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/* The 6bit value in the ATR register controls the load |
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* capacitance C_load * in steps of 0.25pF |
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* |
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* bit (1<<5) of the ATR register is inverted |
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* |
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* C_load(ATR=0x20) = 4.50pF |
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* C_load(ATR=0x00) = 12.50pF |
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* C_load(ATR=0x1f) = 20.25pF |
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* |
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*/ |
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atr &= 0x3f; /* mask out lsb */ |
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atr ^= 1 << 5; /* invert 6th bit */ |
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atr += 2 * 9; /* add offset of 4.5pF; unit[atr] = 0.25pF */ |
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return atr; |
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} |
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/* returns adjustment value + 100 */ |
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static int |
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isl1208_i2c_get_dtr(struct i2c_client *client) |
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{ |
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int dtr = i2c_smbus_read_byte_data(client, ISL1208_REG_DTR); |
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if (dtr < 0) |
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return -EIO; |
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/* dtr encodes adjustments of {-60,-40,-20,0,20,40,60} ppm */ |
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dtr = ((dtr & 0x3) * 20) * (dtr & (1 << 2) ? -1 : 1); |
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return dtr + 100; |
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} |
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static int |
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isl1208_i2c_get_usr(struct i2c_client *client) |
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{ |
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u8 buf[ISL1208_USR_SECTION_LEN] = { 0, }; |
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int ret; |
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ret = isl1208_i2c_read_regs(client, ISL1208_REG_USR1, buf, |
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ISL1208_USR_SECTION_LEN); |
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if (ret < 0) |
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return ret; |
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return (buf[1] << 8) | buf[0]; |
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} |
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static int |
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isl1208_i2c_set_usr(struct i2c_client *client, u16 usr) |
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{ |
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u8 buf[ISL1208_USR_SECTION_LEN]; |
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buf[0] = usr & 0xff; |
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buf[1] = (usr >> 8) & 0xff; |
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return isl1208_i2c_set_regs(client, ISL1208_REG_USR1, buf, |
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ISL1208_USR_SECTION_LEN); |
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} |
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static int |
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isl1208_rtc_toggle_alarm(struct i2c_client *client, int enable) |
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{ |
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int icr = i2c_smbus_read_byte_data(client, ISL1208_REG_INT); |
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if (icr < 0) { |
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dev_err(&client->dev, "%s: reading INT failed\n", __func__); |
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return icr; |
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} |
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if (enable) |
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icr |= ISL1208_REG_INT_ALME | ISL1208_REG_INT_IM; |
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else |
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icr &= ~(ISL1208_REG_INT_ALME | ISL1208_REG_INT_IM); |
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icr = i2c_smbus_write_byte_data(client, ISL1208_REG_INT, icr); |
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if (icr < 0) { |
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dev_err(&client->dev, "%s: writing INT failed\n", __func__); |
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return icr; |
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} |
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return 0; |
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} |
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static int |
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isl1208_rtc_proc(struct device *dev, struct seq_file *seq) |
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{ |
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struct i2c_client *const client = to_i2c_client(dev); |
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int sr, dtr, atr, usr; |
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sr = isl1208_i2c_get_sr(client); |
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if (sr < 0) { |
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dev_err(&client->dev, "%s: reading SR failed\n", __func__); |
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return sr; |
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} |
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seq_printf(seq, "status_reg\t:%s%s%s%s%s%s (0x%.2x)\n", |
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(sr & ISL1208_REG_SR_RTCF) ? " RTCF" : "", |
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(sr & ISL1208_REG_SR_BAT) ? " BAT" : "", |
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(sr & ISL1208_REG_SR_ALM) ? " ALM" : "", |
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(sr & ISL1208_REG_SR_WRTC) ? " WRTC" : "", |
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(sr & ISL1208_REG_SR_XTOSCB) ? " XTOSCB" : "", |
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(sr & ISL1208_REG_SR_ARST) ? " ARST" : "", sr); |
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seq_printf(seq, "batt_status\t: %s\n", |
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(sr & ISL1208_REG_SR_RTCF) ? "bad" : "okay"); |
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dtr = isl1208_i2c_get_dtr(client); |
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if (dtr >= 0) |
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seq_printf(seq, "digital_trim\t: %d ppm\n", dtr - 100); |
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atr = isl1208_i2c_get_atr(client); |
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if (atr >= 0) |
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seq_printf(seq, "analog_trim\t: %d.%.2d pF\n", |
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atr >> 2, (atr & 0x3) * 25); |
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usr = isl1208_i2c_get_usr(client); |
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if (usr >= 0) |
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seq_printf(seq, "user_data\t: 0x%.4x\n", usr); |
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return 0; |
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} |
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static int |
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isl1208_i2c_read_time(struct i2c_client *client, struct rtc_time *tm) |
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{ |
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int sr; |
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u8 regs[ISL1208_RTC_SECTION_LEN] = { 0, }; |
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sr = isl1208_i2c_get_sr(client); |
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if (sr < 0) { |
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dev_err(&client->dev, "%s: reading SR failed\n", __func__); |
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return -EIO; |
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} |
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sr = isl1208_i2c_read_regs(client, 0, regs, ISL1208_RTC_SECTION_LEN); |
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if (sr < 0) { |
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dev_err(&client->dev, "%s: reading RTC section failed\n", |
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__func__); |
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return sr; |
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} |
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tm->tm_sec = bcd2bin(regs[ISL1208_REG_SC]); |
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tm->tm_min = bcd2bin(regs[ISL1208_REG_MN]); |
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/* HR field has a more complex interpretation */ |
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{ |
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const u8 _hr = regs[ISL1208_REG_HR]; |
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if (_hr & ISL1208_REG_HR_MIL) /* 24h format */ |
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tm->tm_hour = bcd2bin(_hr & 0x3f); |
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else { |
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/* 12h format */ |
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tm->tm_hour = bcd2bin(_hr & 0x1f); |
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if (_hr & ISL1208_REG_HR_PM) /* PM flag set */ |
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tm->tm_hour += 12; |
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} |
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} |
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tm->tm_mday = bcd2bin(regs[ISL1208_REG_DT]); |
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tm->tm_mon = bcd2bin(regs[ISL1208_REG_MO]) - 1; /* rtc starts at 1 */ |
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tm->tm_year = bcd2bin(regs[ISL1208_REG_YR]) + 100; |
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tm->tm_wday = bcd2bin(regs[ISL1208_REG_DW]); |
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return 0; |
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} |
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static int |
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isl1208_i2c_read_alarm(struct i2c_client *client, struct rtc_wkalrm *alarm) |
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{ |
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struct rtc_time *const tm = &alarm->time; |
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u8 regs[ISL1208_ALARM_SECTION_LEN] = { 0, }; |
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int icr, yr, sr = isl1208_i2c_get_sr(client); |
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if (sr < 0) { |
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dev_err(&client->dev, "%s: reading SR failed\n", __func__); |
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return sr; |
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} |
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sr = isl1208_i2c_read_regs(client, ISL1208_REG_SCA, regs, |
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ISL1208_ALARM_SECTION_LEN); |
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if (sr < 0) { |
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dev_err(&client->dev, "%s: reading alarm section failed\n", |
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__func__); |
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return sr; |
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} |
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/* MSB of each alarm register is an enable bit */ |
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tm->tm_sec = bcd2bin(regs[ISL1208_REG_SCA - ISL1208_REG_SCA] & 0x7f); |
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tm->tm_min = bcd2bin(regs[ISL1208_REG_MNA - ISL1208_REG_SCA] & 0x7f); |
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tm->tm_hour = bcd2bin(regs[ISL1208_REG_HRA - ISL1208_REG_SCA] & 0x3f); |
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tm->tm_mday = bcd2bin(regs[ISL1208_REG_DTA - ISL1208_REG_SCA] & 0x3f); |
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tm->tm_mon = |
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bcd2bin(regs[ISL1208_REG_MOA - ISL1208_REG_SCA] & 0x1f) - 1; |
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tm->tm_wday = bcd2bin(regs[ISL1208_REG_DWA - ISL1208_REG_SCA] & 0x03); |
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/* The alarm doesn't store the year so get it from the rtc section */ |
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yr = i2c_smbus_read_byte_data(client, ISL1208_REG_YR); |
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if (yr < 0) { |
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dev_err(&client->dev, "%s: reading RTC YR failed\n", __func__); |
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return yr; |
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} |
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tm->tm_year = bcd2bin(yr) + 100; |
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icr = i2c_smbus_read_byte_data(client, ISL1208_REG_INT); |
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if (icr < 0) { |
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dev_err(&client->dev, "%s: reading INT failed\n", __func__); |
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return icr; |
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} |
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alarm->enabled = !!(icr & ISL1208_REG_INT_ALME); |
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return 0; |
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} |
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static int |
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isl1208_i2c_set_alarm(struct i2c_client *client, struct rtc_wkalrm *alarm) |
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{ |
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struct rtc_time *alarm_tm = &alarm->time; |
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u8 regs[ISL1208_ALARM_SECTION_LEN] = { 0, }; |
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const int offs = ISL1208_REG_SCA; |
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struct rtc_time rtc_tm; |
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int err, enable; |
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err = isl1208_i2c_read_time(client, &rtc_tm); |
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if (err) |
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return err; |
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/* If the alarm time is before the current time disable the alarm */ |
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if (!alarm->enabled || rtc_tm_sub(alarm_tm, &rtc_tm) <= 0) |
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enable = 0x00; |
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else |
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enable = 0x80; |
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/* Program the alarm and enable it for each setting */ |
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regs[ISL1208_REG_SCA - offs] = bin2bcd(alarm_tm->tm_sec) | enable; |
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regs[ISL1208_REG_MNA - offs] = bin2bcd(alarm_tm->tm_min) | enable; |
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regs[ISL1208_REG_HRA - offs] = bin2bcd(alarm_tm->tm_hour) | |
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ISL1208_REG_HR_MIL | enable; |
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regs[ISL1208_REG_DTA - offs] = bin2bcd(alarm_tm->tm_mday) | enable; |
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regs[ISL1208_REG_MOA - offs] = bin2bcd(alarm_tm->tm_mon + 1) | enable; |
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regs[ISL1208_REG_DWA - offs] = bin2bcd(alarm_tm->tm_wday & 7) | enable; |
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/* write ALARM registers */ |
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err = isl1208_i2c_set_regs(client, offs, regs, |
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ISL1208_ALARM_SECTION_LEN); |
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if (err < 0) { |
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dev_err(&client->dev, "%s: writing ALARM section failed\n", |
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__func__); |
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return err; |
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} |
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err = isl1208_rtc_toggle_alarm(client, enable); |
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if (err) |
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return err; |
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return 0; |
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} |
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static int |
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isl1208_rtc_read_time(struct device *dev, struct rtc_time *tm) |
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{ |
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return isl1208_i2c_read_time(to_i2c_client(dev), tm); |
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} |
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|
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static int |
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isl1208_i2c_set_time(struct i2c_client *client, struct rtc_time const *tm) |
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{ |
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int sr; |
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u8 regs[ISL1208_RTC_SECTION_LEN] = { 0, }; |
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|
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/* The clock has an 8 bit wide bcd-coded register (they never learn) |
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* for the year. tm_year is an offset from 1900 and we are interested |
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* in the 2000-2099 range, so any value less than 100 is invalid. |
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*/ |
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if (tm->tm_year < 100) |
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return -EINVAL; |
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regs[ISL1208_REG_SC] = bin2bcd(tm->tm_sec); |
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regs[ISL1208_REG_MN] = bin2bcd(tm->tm_min); |
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regs[ISL1208_REG_HR] = bin2bcd(tm->tm_hour) | ISL1208_REG_HR_MIL; |
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regs[ISL1208_REG_DT] = bin2bcd(tm->tm_mday); |
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regs[ISL1208_REG_MO] = bin2bcd(tm->tm_mon + 1); |
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regs[ISL1208_REG_YR] = bin2bcd(tm->tm_year - 100); |
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|
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regs[ISL1208_REG_DW] = bin2bcd(tm->tm_wday & 7); |
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sr = isl1208_i2c_get_sr(client); |
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if (sr < 0) { |
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dev_err(&client->dev, "%s: reading SR failed\n", __func__); |
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return sr; |
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} |
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|
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/* set WRTC */ |
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sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR, |
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sr | ISL1208_REG_SR_WRTC); |
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if (sr < 0) { |
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dev_err(&client->dev, "%s: writing SR failed\n", __func__); |
|
return sr; |
|
} |
|
|
|
/* write RTC registers */ |
|
sr = isl1208_i2c_set_regs(client, 0, regs, ISL1208_RTC_SECTION_LEN); |
|
if (sr < 0) { |
|
dev_err(&client->dev, "%s: writing RTC section failed\n", |
|
__func__); |
|
return sr; |
|
} |
|
|
|
/* clear WRTC again */ |
|
sr = isl1208_i2c_get_sr(client); |
|
if (sr < 0) { |
|
dev_err(&client->dev, "%s: reading SR failed\n", __func__); |
|
return sr; |
|
} |
|
sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR, |
|
sr & ~ISL1208_REG_SR_WRTC); |
|
if (sr < 0) { |
|
dev_err(&client->dev, "%s: writing SR failed\n", __func__); |
|
return sr; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
|
|
static int |
|
isl1208_rtc_set_time(struct device *dev, struct rtc_time *tm) |
|
{ |
|
return isl1208_i2c_set_time(to_i2c_client(dev), tm); |
|
} |
|
|
|
static int |
|
isl1208_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm) |
|
{ |
|
return isl1208_i2c_read_alarm(to_i2c_client(dev), alarm); |
|
} |
|
|
|
static int |
|
isl1208_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm) |
|
{ |
|
return isl1208_i2c_set_alarm(to_i2c_client(dev), alarm); |
|
} |
|
|
|
static ssize_t timestamp0_store(struct device *dev, |
|
struct device_attribute *attr, |
|
const char *buf, size_t count) |
|
{ |
|
struct i2c_client *client = to_i2c_client(dev->parent); |
|
int sr; |
|
|
|
sr = isl1208_i2c_get_sr(client); |
|
if (sr < 0) { |
|
dev_err(dev, "%s: reading SR failed\n", __func__); |
|
return sr; |
|
} |
|
|
|
sr &= ~ISL1208_REG_SR_EVT; |
|
|
|
sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR, sr); |
|
if (sr < 0) |
|
dev_err(dev, "%s: writing SR failed\n", |
|
__func__); |
|
|
|
return count; |
|
}; |
|
|
|
static ssize_t timestamp0_show(struct device *dev, |
|
struct device_attribute *attr, char *buf) |
|
{ |
|
struct i2c_client *client = to_i2c_client(dev->parent); |
|
u8 regs[ISL1219_EVT_SECTION_LEN] = { 0, }; |
|
struct rtc_time tm; |
|
int sr; |
|
|
|
sr = isl1208_i2c_get_sr(client); |
|
if (sr < 0) { |
|
dev_err(dev, "%s: reading SR failed\n", __func__); |
|
return sr; |
|
} |
|
|
|
if (!(sr & ISL1208_REG_SR_EVT)) |
|
return 0; |
|
|
|
sr = isl1208_i2c_read_regs(client, ISL1219_REG_SCT, regs, |
|
ISL1219_EVT_SECTION_LEN); |
|
if (sr < 0) { |
|
dev_err(dev, "%s: reading event section failed\n", |
|
__func__); |
|
return 0; |
|
} |
|
|
|
/* MSB of each alarm register is an enable bit */ |
|
tm.tm_sec = bcd2bin(regs[ISL1219_REG_SCT - ISL1219_REG_SCT] & 0x7f); |
|
tm.tm_min = bcd2bin(regs[ISL1219_REG_MNT - ISL1219_REG_SCT] & 0x7f); |
|
tm.tm_hour = bcd2bin(regs[ISL1219_REG_HRT - ISL1219_REG_SCT] & 0x3f); |
|
tm.tm_mday = bcd2bin(regs[ISL1219_REG_DTT - ISL1219_REG_SCT] & 0x3f); |
|
tm.tm_mon = |
|
bcd2bin(regs[ISL1219_REG_MOT - ISL1219_REG_SCT] & 0x1f) - 1; |
|
tm.tm_year = bcd2bin(regs[ISL1219_REG_YRT - ISL1219_REG_SCT]) + 100; |
|
|
|
sr = rtc_valid_tm(&tm); |
|
if (sr) |
|
return sr; |
|
|
|
return sprintf(buf, "%llu\n", |
|
(unsigned long long)rtc_tm_to_time64(&tm)); |
|
}; |
|
|
|
static DEVICE_ATTR_RW(timestamp0); |
|
|
|
static irqreturn_t |
|
isl1208_rtc_interrupt(int irq, void *data) |
|
{ |
|
unsigned long timeout = jiffies + msecs_to_jiffies(1000); |
|
struct i2c_client *client = data; |
|
struct isl1208_state *isl1208 = i2c_get_clientdata(client); |
|
int handled = 0, sr, err; |
|
|
|
/* |
|
* I2C reads get NAK'ed if we read straight away after an interrupt? |
|
* Using a mdelay/msleep didn't seem to help either, so we work around |
|
* this by continually trying to read the register for a short time. |
|
*/ |
|
while (1) { |
|
sr = isl1208_i2c_get_sr(client); |
|
if (sr >= 0) |
|
break; |
|
|
|
if (time_after(jiffies, timeout)) { |
|
dev_err(&client->dev, "%s: reading SR failed\n", |
|
__func__); |
|
return sr; |
|
} |
|
} |
|
|
|
if (sr & ISL1208_REG_SR_ALM) { |
|
dev_dbg(&client->dev, "alarm!\n"); |
|
|
|
rtc_update_irq(isl1208->rtc, 1, RTC_IRQF | RTC_AF); |
|
|
|
/* Clear the alarm */ |
|
sr &= ~ISL1208_REG_SR_ALM; |
|
sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR, sr); |
|
if (sr < 0) |
|
dev_err(&client->dev, "%s: writing SR failed\n", |
|
__func__); |
|
else |
|
handled = 1; |
|
|
|
/* Disable the alarm */ |
|
err = isl1208_rtc_toggle_alarm(client, 0); |
|
if (err) |
|
return err; |
|
} |
|
|
|
if (isl1208->config->has_tamper && (sr & ISL1208_REG_SR_EVT)) { |
|
dev_warn(&client->dev, "event detected"); |
|
handled = 1; |
|
if (isl1208->config->has_timestamp) |
|
sysfs_notify(&isl1208->rtc->dev.kobj, NULL, |
|
dev_attr_timestamp0.attr.name); |
|
} |
|
|
|
return handled ? IRQ_HANDLED : IRQ_NONE; |
|
} |
|
|
|
static const struct rtc_class_ops isl1208_rtc_ops = { |
|
.proc = isl1208_rtc_proc, |
|
.read_time = isl1208_rtc_read_time, |
|
.set_time = isl1208_rtc_set_time, |
|
.read_alarm = isl1208_rtc_read_alarm, |
|
.set_alarm = isl1208_rtc_set_alarm, |
|
}; |
|
|
|
/* sysfs interface */ |
|
|
|
static ssize_t |
|
isl1208_sysfs_show_atrim(struct device *dev, |
|
struct device_attribute *attr, char *buf) |
|
{ |
|
int atr = isl1208_i2c_get_atr(to_i2c_client(dev->parent)); |
|
if (atr < 0) |
|
return atr; |
|
|
|
return sprintf(buf, "%d.%.2d pF\n", atr >> 2, (atr & 0x3) * 25); |
|
} |
|
|
|
static DEVICE_ATTR(atrim, S_IRUGO, isl1208_sysfs_show_atrim, NULL); |
|
|
|
static ssize_t |
|
isl1208_sysfs_show_dtrim(struct device *dev, |
|
struct device_attribute *attr, char *buf) |
|
{ |
|
int dtr = isl1208_i2c_get_dtr(to_i2c_client(dev->parent)); |
|
if (dtr < 0) |
|
return dtr; |
|
|
|
return sprintf(buf, "%d ppm\n", dtr - 100); |
|
} |
|
|
|
static DEVICE_ATTR(dtrim, S_IRUGO, isl1208_sysfs_show_dtrim, NULL); |
|
|
|
static ssize_t |
|
isl1208_sysfs_show_usr(struct device *dev, |
|
struct device_attribute *attr, char *buf) |
|
{ |
|
int usr = isl1208_i2c_get_usr(to_i2c_client(dev->parent)); |
|
if (usr < 0) |
|
return usr; |
|
|
|
return sprintf(buf, "0x%.4x\n", usr); |
|
} |
|
|
|
static ssize_t |
|
isl1208_sysfs_store_usr(struct device *dev, |
|
struct device_attribute *attr, |
|
const char *buf, size_t count) |
|
{ |
|
int usr = -1; |
|
|
|
if (buf[0] == '0' && (buf[1] == 'x' || buf[1] == 'X')) { |
|
if (sscanf(buf, "%x", &usr) != 1) |
|
return -EINVAL; |
|
} else { |
|
if (sscanf(buf, "%d", &usr) != 1) |
|
return -EINVAL; |
|
} |
|
|
|
if (usr < 0 || usr > 0xffff) |
|
return -EINVAL; |
|
|
|
if (isl1208_i2c_set_usr(to_i2c_client(dev->parent), usr)) |
|
return -EIO; |
|
|
|
return count; |
|
} |
|
|
|
static DEVICE_ATTR(usr, S_IRUGO | S_IWUSR, isl1208_sysfs_show_usr, |
|
isl1208_sysfs_store_usr); |
|
|
|
static struct attribute *isl1208_rtc_attrs[] = { |
|
&dev_attr_atrim.attr, |
|
&dev_attr_dtrim.attr, |
|
&dev_attr_usr.attr, |
|
NULL |
|
}; |
|
|
|
static const struct attribute_group isl1208_rtc_sysfs_files = { |
|
.attrs = isl1208_rtc_attrs, |
|
}; |
|
|
|
static struct attribute *isl1219_rtc_attrs[] = { |
|
&dev_attr_timestamp0.attr, |
|
NULL |
|
}; |
|
|
|
static const struct attribute_group isl1219_rtc_sysfs_files = { |
|
.attrs = isl1219_rtc_attrs, |
|
}; |
|
|
|
static int isl1208_nvmem_read(void *priv, unsigned int off, void *buf, |
|
size_t count) |
|
{ |
|
struct isl1208_state *isl1208 = priv; |
|
struct i2c_client *client = to_i2c_client(isl1208->rtc->dev.parent); |
|
int ret; |
|
|
|
/* nvmem sanitizes offset/count for us, but count==0 is possible */ |
|
if (!count) |
|
return count; |
|
ret = isl1208_i2c_read_regs(client, ISL1208_REG_USR1 + off, buf, |
|
count); |
|
return ret == 0 ? count : ret; |
|
} |
|
|
|
static int isl1208_nvmem_write(void *priv, unsigned int off, void *buf, |
|
size_t count) |
|
{ |
|
struct isl1208_state *isl1208 = priv; |
|
struct i2c_client *client = to_i2c_client(isl1208->rtc->dev.parent); |
|
int ret; |
|
|
|
/* nvmem sanitizes off/count for us, but count==0 is possible */ |
|
if (!count) |
|
return count; |
|
ret = isl1208_i2c_set_regs(client, ISL1208_REG_USR1 + off, buf, |
|
count); |
|
|
|
return ret == 0 ? count : ret; |
|
} |
|
|
|
static const struct nvmem_config isl1208_nvmem_config = { |
|
.name = "isl1208_nvram", |
|
.word_size = 1, |
|
.stride = 1, |
|
/* .size from chip specific config */ |
|
.reg_read = isl1208_nvmem_read, |
|
.reg_write = isl1208_nvmem_write, |
|
}; |
|
|
|
static int isl1208_setup_irq(struct i2c_client *client, int irq) |
|
{ |
|
int rc = devm_request_threaded_irq(&client->dev, irq, NULL, |
|
isl1208_rtc_interrupt, |
|
IRQF_SHARED | IRQF_ONESHOT, |
|
isl1208_driver.driver.name, |
|
client); |
|
if (!rc) { |
|
device_init_wakeup(&client->dev, 1); |
|
enable_irq_wake(irq); |
|
} else { |
|
dev_err(&client->dev, |
|
"Unable to request irq %d, no alarm support\n", |
|
irq); |
|
} |
|
return rc; |
|
} |
|
|
|
static int |
|
isl1208_probe(struct i2c_client *client, const struct i2c_device_id *id) |
|
{ |
|
int rc = 0; |
|
struct isl1208_state *isl1208; |
|
int evdet_irq = -1; |
|
|
|
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) |
|
return -ENODEV; |
|
|
|
if (isl1208_i2c_validate_client(client) < 0) |
|
return -ENODEV; |
|
|
|
/* Allocate driver state, point i2c client data to it */ |
|
isl1208 = devm_kzalloc(&client->dev, sizeof(*isl1208), GFP_KERNEL); |
|
if (!isl1208) |
|
return -ENOMEM; |
|
i2c_set_clientdata(client, isl1208); |
|
|
|
/* Determine which chip we have */ |
|
if (client->dev.of_node) { |
|
isl1208->config = of_device_get_match_data(&client->dev); |
|
if (!isl1208->config) |
|
return -ENODEV; |
|
} else { |
|
if (id->driver_data >= ISL_LAST_ID) |
|
return -ENODEV; |
|
isl1208->config = &isl1208_configs[id->driver_data]; |
|
} |
|
|
|
isl1208->rtc = devm_rtc_allocate_device(&client->dev); |
|
if (IS_ERR(isl1208->rtc)) |
|
return PTR_ERR(isl1208->rtc); |
|
|
|
isl1208->rtc->ops = &isl1208_rtc_ops; |
|
|
|
/* Setup nvmem configuration in driver state struct */ |
|
isl1208->nvmem_config = isl1208_nvmem_config; |
|
isl1208->nvmem_config.size = isl1208->config->nvmem_length; |
|
isl1208->nvmem_config.priv = isl1208; |
|
|
|
rc = isl1208_i2c_get_sr(client); |
|
if (rc < 0) { |
|
dev_err(&client->dev, "reading status failed\n"); |
|
return rc; |
|
} |
|
|
|
if (rc & ISL1208_REG_SR_RTCF) |
|
dev_warn(&client->dev, "rtc power failure detected, " |
|
"please set clock.\n"); |
|
|
|
if (isl1208->config->has_tamper) { |
|
struct device_node *np = client->dev.of_node; |
|
u32 evienb; |
|
|
|
rc = i2c_smbus_read_byte_data(client, ISL1219_REG_EV); |
|
if (rc < 0) { |
|
dev_err(&client->dev, "failed to read EV reg\n"); |
|
return rc; |
|
} |
|
rc |= ISL1219_REG_EV_EVEN; |
|
if (!of_property_read_u32(np, "isil,ev-evienb", &evienb)) { |
|
if (evienb) |
|
rc |= ISL1219_REG_EV_EVIENB; |
|
else |
|
rc &= ~ISL1219_REG_EV_EVIENB; |
|
} |
|
rc = i2c_smbus_write_byte_data(client, ISL1219_REG_EV, rc); |
|
if (rc < 0) { |
|
dev_err(&client->dev, "could not enable tamper detection\n"); |
|
return rc; |
|
} |
|
evdet_irq = of_irq_get_byname(np, "evdet"); |
|
} |
|
if (isl1208->config->has_timestamp) { |
|
rc = rtc_add_group(isl1208->rtc, &isl1219_rtc_sysfs_files); |
|
if (rc) |
|
return rc; |
|
} |
|
|
|
rc = rtc_add_group(isl1208->rtc, &isl1208_rtc_sysfs_files); |
|
if (rc) |
|
return rc; |
|
|
|
if (client->irq > 0) |
|
rc = isl1208_setup_irq(client, client->irq); |
|
if (rc) |
|
return rc; |
|
|
|
if (evdet_irq > 0 && evdet_irq != client->irq) |
|
rc = isl1208_setup_irq(client, evdet_irq); |
|
if (rc) |
|
return rc; |
|
|
|
rc = devm_rtc_nvmem_register(isl1208->rtc, &isl1208->nvmem_config); |
|
if (rc) |
|
return rc; |
|
|
|
return devm_rtc_register_device(isl1208->rtc); |
|
} |
|
|
|
static struct i2c_driver isl1208_driver = { |
|
.driver = { |
|
.name = "rtc-isl1208", |
|
.of_match_table = of_match_ptr(isl1208_of_match), |
|
}, |
|
.probe = isl1208_probe, |
|
.id_table = isl1208_id, |
|
}; |
|
|
|
module_i2c_driver(isl1208_driver); |
|
|
|
MODULE_AUTHOR("Herbert Valerio Riedel <[email protected]>"); |
|
MODULE_DESCRIPTION("Intersil ISL1208 RTC driver"); |
|
MODULE_LICENSE("GPL");
|
|
|