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757 lines
18 KiB
757 lines
18 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* An I2C driver for Ricoh RS5C372, R2025S/D and RV5C38[67] RTCs |
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* |
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* Copyright (C) 2005 Pavel Mironchik <[email protected]> |
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* Copyright (C) 2006 Tower Technologies |
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* Copyright (C) 2008 Paul Mundt |
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*/ |
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#include <linux/i2c.h> |
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#include <linux/rtc.h> |
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#include <linux/bcd.h> |
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#include <linux/slab.h> |
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#include <linux/module.h> |
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#include <linux/of_device.h> |
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/* |
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* Ricoh has a family of I2C based RTCs, which differ only slightly from |
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* each other. Differences center on pinout (e.g. how many interrupts, |
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* output clock, etc) and how the control registers are used. The '372 |
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* is significant only because that's the one this driver first supported. |
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*/ |
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#define RS5C372_REG_SECS 0 |
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#define RS5C372_REG_MINS 1 |
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#define RS5C372_REG_HOURS 2 |
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#define RS5C372_REG_WDAY 3 |
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#define RS5C372_REG_DAY 4 |
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#define RS5C372_REG_MONTH 5 |
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#define RS5C372_REG_YEAR 6 |
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#define RS5C372_REG_TRIM 7 |
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# define RS5C372_TRIM_XSL 0x80 |
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# define RS5C372_TRIM_MASK 0x7F |
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#define RS5C_REG_ALARM_A_MIN 8 /* or ALARM_W */ |
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#define RS5C_REG_ALARM_A_HOURS 9 |
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#define RS5C_REG_ALARM_A_WDAY 10 |
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#define RS5C_REG_ALARM_B_MIN 11 /* or ALARM_D */ |
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#define RS5C_REG_ALARM_B_HOURS 12 |
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#define RS5C_REG_ALARM_B_WDAY 13 /* (ALARM_B only) */ |
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#define RS5C_REG_CTRL1 14 |
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# define RS5C_CTRL1_AALE (1 << 7) /* or WALE */ |
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# define RS5C_CTRL1_BALE (1 << 6) /* or DALE */ |
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# define RV5C387_CTRL1_24 (1 << 5) |
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# define RS5C372A_CTRL1_SL1 (1 << 5) |
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# define RS5C_CTRL1_CT_MASK (7 << 0) |
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# define RS5C_CTRL1_CT0 (0 << 0) /* no periodic irq */ |
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# define RS5C_CTRL1_CT4 (4 << 0) /* 1 Hz level irq */ |
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#define RS5C_REG_CTRL2 15 |
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# define RS5C372_CTRL2_24 (1 << 5) |
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# define RS5C_CTRL2_XSTP (1 << 4) /* only if !R2x2x */ |
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# define R2x2x_CTRL2_VDET (1 << 6) /* only if R2x2x */ |
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# define R2x2x_CTRL2_XSTP (1 << 5) /* only if R2x2x */ |
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# define R2x2x_CTRL2_PON (1 << 4) /* only if R2x2x */ |
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# define RS5C_CTRL2_CTFG (1 << 2) |
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# define RS5C_CTRL2_AAFG (1 << 1) /* or WAFG */ |
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# define RS5C_CTRL2_BAFG (1 << 0) /* or DAFG */ |
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/* to read (style 1) or write registers starting at R */ |
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#define RS5C_ADDR(R) (((R) << 4) | 0) |
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enum rtc_type { |
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rtc_undef = 0, |
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rtc_r2025sd, |
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rtc_r2221tl, |
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rtc_rs5c372a, |
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rtc_rs5c372b, |
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rtc_rv5c386, |
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rtc_rv5c387a, |
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}; |
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static const struct i2c_device_id rs5c372_id[] = { |
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{ "r2025sd", rtc_r2025sd }, |
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{ "r2221tl", rtc_r2221tl }, |
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{ "rs5c372a", rtc_rs5c372a }, |
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{ "rs5c372b", rtc_rs5c372b }, |
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{ "rv5c386", rtc_rv5c386 }, |
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{ "rv5c387a", rtc_rv5c387a }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(i2c, rs5c372_id); |
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static const __maybe_unused struct of_device_id rs5c372_of_match[] = { |
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{ |
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.compatible = "ricoh,r2025sd", |
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.data = (void *)rtc_r2025sd |
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}, |
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{ |
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.compatible = "ricoh,r2221tl", |
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.data = (void *)rtc_r2221tl |
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}, |
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{ |
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.compatible = "ricoh,rs5c372a", |
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.data = (void *)rtc_rs5c372a |
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}, |
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{ |
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.compatible = "ricoh,rs5c372b", |
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.data = (void *)rtc_rs5c372b |
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}, |
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{ |
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.compatible = "ricoh,rv5c386", |
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.data = (void *)rtc_rv5c386 |
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}, |
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{ |
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.compatible = "ricoh,rv5c387a", |
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.data = (void *)rtc_rv5c387a |
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}, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(of, rs5c372_of_match); |
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/* REVISIT: this assumes that: |
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* - we're in the 21st century, so it's safe to ignore the century |
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* bit for rv5c38[67] (REG_MONTH bit 7); |
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* - we should use ALARM_A not ALARM_B (may be wrong on some boards) |
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*/ |
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struct rs5c372 { |
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struct i2c_client *client; |
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struct rtc_device *rtc; |
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enum rtc_type type; |
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unsigned time24:1; |
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unsigned has_irq:1; |
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unsigned smbus:1; |
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char buf[17]; |
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char *regs; |
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}; |
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static int rs5c_get_regs(struct rs5c372 *rs5c) |
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{ |
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struct i2c_client *client = rs5c->client; |
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struct i2c_msg msgs[] = { |
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{ |
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.addr = client->addr, |
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.flags = I2C_M_RD, |
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.len = sizeof(rs5c->buf), |
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.buf = rs5c->buf |
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}, |
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}; |
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/* This implements the third reading method from the datasheet, using |
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* an internal address that's reset after each transaction (by STOP) |
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* to 0x0f ... so we read extra registers, and skip the first one. |
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* |
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* The first method doesn't work with the iop3xx adapter driver, on at |
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* least 80219 chips; this works around that bug. |
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* |
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* The third method on the other hand doesn't work for the SMBus-only |
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* configurations, so we use the the first method there, stripping off |
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* the extra register in the process. |
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*/ |
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if (rs5c->smbus) { |
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int addr = RS5C_ADDR(RS5C372_REG_SECS); |
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int size = sizeof(rs5c->buf) - 1; |
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if (i2c_smbus_read_i2c_block_data(client, addr, size, |
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rs5c->buf + 1) != size) { |
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dev_warn(&client->dev, "can't read registers\n"); |
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return -EIO; |
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} |
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} else { |
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if ((i2c_transfer(client->adapter, msgs, 1)) != 1) { |
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dev_warn(&client->dev, "can't read registers\n"); |
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return -EIO; |
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} |
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} |
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dev_dbg(&client->dev, |
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"%3ph (%02x) %3ph (%02x), %3ph, %3ph; %02x %02x\n", |
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rs5c->regs + 0, rs5c->regs[3], |
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rs5c->regs + 4, rs5c->regs[7], |
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rs5c->regs + 8, rs5c->regs + 11, |
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rs5c->regs[14], rs5c->regs[15]); |
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return 0; |
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} |
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static unsigned rs5c_reg2hr(struct rs5c372 *rs5c, unsigned reg) |
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{ |
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unsigned hour; |
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if (rs5c->time24) |
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return bcd2bin(reg & 0x3f); |
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hour = bcd2bin(reg & 0x1f); |
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if (hour == 12) |
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hour = 0; |
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if (reg & 0x20) |
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hour += 12; |
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return hour; |
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} |
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static unsigned rs5c_hr2reg(struct rs5c372 *rs5c, unsigned hour) |
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{ |
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if (rs5c->time24) |
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return bin2bcd(hour); |
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if (hour > 12) |
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return 0x20 | bin2bcd(hour - 12); |
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if (hour == 12) |
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return 0x20 | bin2bcd(12); |
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if (hour == 0) |
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return bin2bcd(12); |
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return bin2bcd(hour); |
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} |
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static int rs5c372_rtc_read_time(struct device *dev, struct rtc_time *tm) |
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{ |
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struct i2c_client *client = to_i2c_client(dev); |
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struct rs5c372 *rs5c = i2c_get_clientdata(client); |
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int status = rs5c_get_regs(rs5c); |
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unsigned char ctrl2 = rs5c->regs[RS5C_REG_CTRL2]; |
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if (status < 0) |
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return status; |
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switch (rs5c->type) { |
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case rtc_r2025sd: |
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case rtc_r2221tl: |
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if ((rs5c->type == rtc_r2025sd && !(ctrl2 & R2x2x_CTRL2_XSTP)) || |
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(rs5c->type == rtc_r2221tl && (ctrl2 & R2x2x_CTRL2_XSTP))) { |
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dev_warn(&client->dev, "rtc oscillator interruption detected. Please reset the rtc clock.\n"); |
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return -EINVAL; |
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} |
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break; |
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default: |
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if (ctrl2 & RS5C_CTRL2_XSTP) { |
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dev_warn(&client->dev, "rtc oscillator interruption detected. Please reset the rtc clock.\n"); |
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return -EINVAL; |
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} |
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} |
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tm->tm_sec = bcd2bin(rs5c->regs[RS5C372_REG_SECS] & 0x7f); |
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tm->tm_min = bcd2bin(rs5c->regs[RS5C372_REG_MINS] & 0x7f); |
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tm->tm_hour = rs5c_reg2hr(rs5c, rs5c->regs[RS5C372_REG_HOURS]); |
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tm->tm_wday = bcd2bin(rs5c->regs[RS5C372_REG_WDAY] & 0x07); |
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tm->tm_mday = bcd2bin(rs5c->regs[RS5C372_REG_DAY] & 0x3f); |
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/* tm->tm_mon is zero-based */ |
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tm->tm_mon = bcd2bin(rs5c->regs[RS5C372_REG_MONTH] & 0x1f) - 1; |
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/* year is 1900 + tm->tm_year */ |
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tm->tm_year = bcd2bin(rs5c->regs[RS5C372_REG_YEAR]) + 100; |
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dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, " |
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"mday=%d, mon=%d, year=%d, wday=%d\n", |
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__func__, |
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tm->tm_sec, tm->tm_min, tm->tm_hour, |
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tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday); |
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return 0; |
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} |
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static int rs5c372_rtc_set_time(struct device *dev, struct rtc_time *tm) |
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{ |
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struct i2c_client *client = to_i2c_client(dev); |
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struct rs5c372 *rs5c = i2c_get_clientdata(client); |
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unsigned char buf[7]; |
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unsigned char ctrl2; |
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int addr; |
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dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d " |
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"mday=%d, mon=%d, year=%d, wday=%d\n", |
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__func__, |
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tm->tm_sec, tm->tm_min, tm->tm_hour, |
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tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday); |
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addr = RS5C_ADDR(RS5C372_REG_SECS); |
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buf[0] = bin2bcd(tm->tm_sec); |
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buf[1] = bin2bcd(tm->tm_min); |
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buf[2] = rs5c_hr2reg(rs5c, tm->tm_hour); |
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buf[3] = bin2bcd(tm->tm_wday); |
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buf[4] = bin2bcd(tm->tm_mday); |
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buf[5] = bin2bcd(tm->tm_mon + 1); |
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buf[6] = bin2bcd(tm->tm_year - 100); |
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if (i2c_smbus_write_i2c_block_data(client, addr, sizeof(buf), buf) < 0) { |
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dev_dbg(&client->dev, "%s: write error in line %i\n", |
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__func__, __LINE__); |
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return -EIO; |
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} |
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addr = RS5C_ADDR(RS5C_REG_CTRL2); |
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ctrl2 = i2c_smbus_read_byte_data(client, addr); |
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/* clear rtc warning bits */ |
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switch (rs5c->type) { |
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case rtc_r2025sd: |
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case rtc_r2221tl: |
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ctrl2 &= ~(R2x2x_CTRL2_VDET | R2x2x_CTRL2_PON); |
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if (rs5c->type == rtc_r2025sd) |
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ctrl2 |= R2x2x_CTRL2_XSTP; |
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else |
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ctrl2 &= ~R2x2x_CTRL2_XSTP; |
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break; |
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default: |
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ctrl2 &= ~RS5C_CTRL2_XSTP; |
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break; |
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} |
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if (i2c_smbus_write_byte_data(client, addr, ctrl2) < 0) { |
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dev_dbg(&client->dev, "%s: write error in line %i\n", |
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__func__, __LINE__); |
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return -EIO; |
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} |
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return 0; |
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} |
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#if IS_ENABLED(CONFIG_RTC_INTF_PROC) |
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#define NEED_TRIM |
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#endif |
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#if IS_ENABLED(CONFIG_RTC_INTF_SYSFS) |
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#define NEED_TRIM |
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#endif |
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#ifdef NEED_TRIM |
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static int rs5c372_get_trim(struct i2c_client *client, int *osc, int *trim) |
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{ |
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struct rs5c372 *rs5c372 = i2c_get_clientdata(client); |
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u8 tmp = rs5c372->regs[RS5C372_REG_TRIM]; |
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if (osc) |
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*osc = (tmp & RS5C372_TRIM_XSL) ? 32000 : 32768; |
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if (trim) { |
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dev_dbg(&client->dev, "%s: raw trim=%x\n", __func__, tmp); |
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tmp &= RS5C372_TRIM_MASK; |
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if (tmp & 0x3e) { |
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int t = tmp & 0x3f; |
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if (tmp & 0x40) |
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t = (~t | (s8)0xc0) + 1; |
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else |
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t = t - 1; |
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tmp = t * 2; |
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} else |
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tmp = 0; |
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*trim = tmp; |
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} |
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return 0; |
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} |
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#endif |
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static int rs5c_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) |
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{ |
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struct i2c_client *client = to_i2c_client(dev); |
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struct rs5c372 *rs5c = i2c_get_clientdata(client); |
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unsigned char buf; |
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int status, addr; |
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buf = rs5c->regs[RS5C_REG_CTRL1]; |
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if (!rs5c->has_irq) |
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return -EINVAL; |
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status = rs5c_get_regs(rs5c); |
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if (status < 0) |
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return status; |
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addr = RS5C_ADDR(RS5C_REG_CTRL1); |
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if (enabled) |
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buf |= RS5C_CTRL1_AALE; |
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else |
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buf &= ~RS5C_CTRL1_AALE; |
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if (i2c_smbus_write_byte_data(client, addr, buf) < 0) { |
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dev_warn(dev, "can't update alarm\n"); |
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status = -EIO; |
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} else |
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rs5c->regs[RS5C_REG_CTRL1] = buf; |
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return status; |
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} |
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/* NOTE: Since RTC_WKALM_{RD,SET} were originally defined for EFI, |
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* which only exposes a polled programming interface; and since |
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* these calls map directly to those EFI requests; we don't demand |
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* we have an IRQ for this chip when we go through this API. |
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* |
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* The older x86_pc derived RTC_ALM_{READ,SET} calls require irqs |
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* though, managed through RTC_AIE_{ON,OFF} requests. |
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*/ |
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static int rs5c_read_alarm(struct device *dev, struct rtc_wkalrm *t) |
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{ |
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struct i2c_client *client = to_i2c_client(dev); |
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struct rs5c372 *rs5c = i2c_get_clientdata(client); |
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int status; |
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status = rs5c_get_regs(rs5c); |
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if (status < 0) |
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return status; |
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/* report alarm time */ |
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t->time.tm_sec = 0; |
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t->time.tm_min = bcd2bin(rs5c->regs[RS5C_REG_ALARM_A_MIN] & 0x7f); |
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t->time.tm_hour = rs5c_reg2hr(rs5c, rs5c->regs[RS5C_REG_ALARM_A_HOURS]); |
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/* ... and status */ |
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t->enabled = !!(rs5c->regs[RS5C_REG_CTRL1] & RS5C_CTRL1_AALE); |
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t->pending = !!(rs5c->regs[RS5C_REG_CTRL2] & RS5C_CTRL2_AAFG); |
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return 0; |
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} |
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static int rs5c_set_alarm(struct device *dev, struct rtc_wkalrm *t) |
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{ |
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struct i2c_client *client = to_i2c_client(dev); |
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struct rs5c372 *rs5c = i2c_get_clientdata(client); |
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int status, addr, i; |
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unsigned char buf[3]; |
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/* only handle up to 24 hours in the future, like RTC_ALM_SET */ |
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if (t->time.tm_mday != -1 |
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|| t->time.tm_mon != -1 |
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|| t->time.tm_year != -1) |
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return -EINVAL; |
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/* REVISIT: round up tm_sec */ |
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/* if needed, disable irq (clears pending status) */ |
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status = rs5c_get_regs(rs5c); |
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if (status < 0) |
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return status; |
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if (rs5c->regs[RS5C_REG_CTRL1] & RS5C_CTRL1_AALE) { |
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addr = RS5C_ADDR(RS5C_REG_CTRL1); |
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buf[0] = rs5c->regs[RS5C_REG_CTRL1] & ~RS5C_CTRL1_AALE; |
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if (i2c_smbus_write_byte_data(client, addr, buf[0]) < 0) { |
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dev_dbg(dev, "can't disable alarm\n"); |
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return -EIO; |
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} |
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rs5c->regs[RS5C_REG_CTRL1] = buf[0]; |
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} |
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/* set alarm */ |
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buf[0] = bin2bcd(t->time.tm_min); |
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buf[1] = rs5c_hr2reg(rs5c, t->time.tm_hour); |
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buf[2] = 0x7f; /* any/all days */ |
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for (i = 0; i < sizeof(buf); i++) { |
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addr = RS5C_ADDR(RS5C_REG_ALARM_A_MIN + i); |
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if (i2c_smbus_write_byte_data(client, addr, buf[i]) < 0) { |
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dev_dbg(dev, "can't set alarm time\n"); |
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return -EIO; |
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} |
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} |
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|
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/* ... and maybe enable its irq */ |
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if (t->enabled) { |
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addr = RS5C_ADDR(RS5C_REG_CTRL1); |
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buf[0] = rs5c->regs[RS5C_REG_CTRL1] | RS5C_CTRL1_AALE; |
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if (i2c_smbus_write_byte_data(client, addr, buf[0]) < 0) |
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dev_warn(dev, "can't enable alarm\n"); |
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rs5c->regs[RS5C_REG_CTRL1] = buf[0]; |
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} |
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return 0; |
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} |
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#if IS_ENABLED(CONFIG_RTC_INTF_PROC) |
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static int rs5c372_rtc_proc(struct device *dev, struct seq_file *seq) |
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{ |
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int err, osc, trim; |
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err = rs5c372_get_trim(to_i2c_client(dev), &osc, &trim); |
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if (err == 0) { |
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seq_printf(seq, "crystal\t\t: %d.%03d KHz\n", |
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osc / 1000, osc % 1000); |
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seq_printf(seq, "trim\t\t: %d\n", trim); |
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} |
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return 0; |
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} |
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#else |
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#define rs5c372_rtc_proc NULL |
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#endif |
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static const struct rtc_class_ops rs5c372_rtc_ops = { |
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.proc = rs5c372_rtc_proc, |
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.read_time = rs5c372_rtc_read_time, |
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.set_time = rs5c372_rtc_set_time, |
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.read_alarm = rs5c_read_alarm, |
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.set_alarm = rs5c_set_alarm, |
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.alarm_irq_enable = rs5c_rtc_alarm_irq_enable, |
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}; |
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|
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#if IS_ENABLED(CONFIG_RTC_INTF_SYSFS) |
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|
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static ssize_t rs5c372_sysfs_show_trim(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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int err, trim; |
|
|
|
err = rs5c372_get_trim(to_i2c_client(dev), NULL, &trim); |
|
if (err) |
|
return err; |
|
|
|
return sprintf(buf, "%d\n", trim); |
|
} |
|
static DEVICE_ATTR(trim, S_IRUGO, rs5c372_sysfs_show_trim, NULL); |
|
|
|
static ssize_t rs5c372_sysfs_show_osc(struct device *dev, |
|
struct device_attribute *attr, char *buf) |
|
{ |
|
int err, osc; |
|
|
|
err = rs5c372_get_trim(to_i2c_client(dev), &osc, NULL); |
|
if (err) |
|
return err; |
|
|
|
return sprintf(buf, "%d.%03d KHz\n", osc / 1000, osc % 1000); |
|
} |
|
static DEVICE_ATTR(osc, S_IRUGO, rs5c372_sysfs_show_osc, NULL); |
|
|
|
static int rs5c_sysfs_register(struct device *dev) |
|
{ |
|
int err; |
|
|
|
err = device_create_file(dev, &dev_attr_trim); |
|
if (err) |
|
return err; |
|
err = device_create_file(dev, &dev_attr_osc); |
|
if (err) |
|
device_remove_file(dev, &dev_attr_trim); |
|
|
|
return err; |
|
} |
|
|
|
static void rs5c_sysfs_unregister(struct device *dev) |
|
{ |
|
device_remove_file(dev, &dev_attr_trim); |
|
device_remove_file(dev, &dev_attr_osc); |
|
} |
|
|
|
#else |
|
static int rs5c_sysfs_register(struct device *dev) |
|
{ |
|
return 0; |
|
} |
|
|
|
static void rs5c_sysfs_unregister(struct device *dev) |
|
{ |
|
/* nothing */ |
|
} |
|
#endif /* SYSFS */ |
|
|
|
static struct i2c_driver rs5c372_driver; |
|
|
|
static int rs5c_oscillator_setup(struct rs5c372 *rs5c372) |
|
{ |
|
unsigned char buf[2]; |
|
int addr, i, ret = 0; |
|
|
|
addr = RS5C_ADDR(RS5C_REG_CTRL1); |
|
buf[0] = rs5c372->regs[RS5C_REG_CTRL1]; |
|
buf[1] = rs5c372->regs[RS5C_REG_CTRL2]; |
|
|
|
switch (rs5c372->type) { |
|
case rtc_r2025sd: |
|
if (buf[1] & R2x2x_CTRL2_XSTP) |
|
return ret; |
|
break; |
|
case rtc_r2221tl: |
|
if (!(buf[1] & R2x2x_CTRL2_XSTP)) |
|
return ret; |
|
break; |
|
default: |
|
if (!(buf[1] & RS5C_CTRL2_XSTP)) |
|
return ret; |
|
break; |
|
} |
|
|
|
/* use 24hr mode */ |
|
switch (rs5c372->type) { |
|
case rtc_rs5c372a: |
|
case rtc_rs5c372b: |
|
buf[1] |= RS5C372_CTRL2_24; |
|
rs5c372->time24 = 1; |
|
break; |
|
case rtc_r2025sd: |
|
case rtc_r2221tl: |
|
case rtc_rv5c386: |
|
case rtc_rv5c387a: |
|
buf[0] |= RV5C387_CTRL1_24; |
|
rs5c372->time24 = 1; |
|
break; |
|
default: |
|
/* impossible */ |
|
break; |
|
} |
|
|
|
for (i = 0; i < sizeof(buf); i++) { |
|
addr = RS5C_ADDR(RS5C_REG_CTRL1 + i); |
|
ret = i2c_smbus_write_byte_data(rs5c372->client, addr, buf[i]); |
|
if (unlikely(ret < 0)) |
|
return ret; |
|
} |
|
|
|
rs5c372->regs[RS5C_REG_CTRL1] = buf[0]; |
|
rs5c372->regs[RS5C_REG_CTRL2] = buf[1]; |
|
|
|
return 0; |
|
} |
|
|
|
static int rs5c372_probe(struct i2c_client *client, |
|
const struct i2c_device_id *id) |
|
{ |
|
int err = 0; |
|
int smbus_mode = 0; |
|
struct rs5c372 *rs5c372; |
|
|
|
dev_dbg(&client->dev, "%s\n", __func__); |
|
|
|
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C | |
|
I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_I2C_BLOCK)) { |
|
/* |
|
* If we don't have any master mode adapter, try breaking |
|
* it down in to the barest of capabilities. |
|
*/ |
|
if (i2c_check_functionality(client->adapter, |
|
I2C_FUNC_SMBUS_BYTE_DATA | |
|
I2C_FUNC_SMBUS_I2C_BLOCK)) |
|
smbus_mode = 1; |
|
else { |
|
/* Still no good, give up */ |
|
err = -ENODEV; |
|
goto exit; |
|
} |
|
} |
|
|
|
rs5c372 = devm_kzalloc(&client->dev, sizeof(struct rs5c372), |
|
GFP_KERNEL); |
|
if (!rs5c372) { |
|
err = -ENOMEM; |
|
goto exit; |
|
} |
|
|
|
rs5c372->client = client; |
|
i2c_set_clientdata(client, rs5c372); |
|
if (client->dev.of_node) |
|
rs5c372->type = (enum rtc_type) |
|
of_device_get_match_data(&client->dev); |
|
else |
|
rs5c372->type = id->driver_data; |
|
|
|
/* we read registers 0x0f then 0x00-0x0f; skip the first one */ |
|
rs5c372->regs = &rs5c372->buf[1]; |
|
rs5c372->smbus = smbus_mode; |
|
|
|
err = rs5c_get_regs(rs5c372); |
|
if (err < 0) |
|
goto exit; |
|
|
|
/* clock may be set for am/pm or 24 hr time */ |
|
switch (rs5c372->type) { |
|
case rtc_rs5c372a: |
|
case rtc_rs5c372b: |
|
/* alarm uses ALARM_A; and nINTRA on 372a, nINTR on 372b. |
|
* so does periodic irq, except some 327a modes. |
|
*/ |
|
if (rs5c372->regs[RS5C_REG_CTRL2] & RS5C372_CTRL2_24) |
|
rs5c372->time24 = 1; |
|
break; |
|
case rtc_r2025sd: |
|
case rtc_r2221tl: |
|
case rtc_rv5c386: |
|
case rtc_rv5c387a: |
|
if (rs5c372->regs[RS5C_REG_CTRL1] & RV5C387_CTRL1_24) |
|
rs5c372->time24 = 1; |
|
/* alarm uses ALARM_W; and nINTRB for alarm and periodic |
|
* irq, on both 386 and 387 |
|
*/ |
|
break; |
|
default: |
|
dev_err(&client->dev, "unknown RTC type\n"); |
|
goto exit; |
|
} |
|
|
|
/* if the oscillator lost power and no other software (like |
|
* the bootloader) set it up, do it here. |
|
* |
|
* The R2025S/D does this a little differently than the other |
|
* parts, so we special case that.. |
|
*/ |
|
err = rs5c_oscillator_setup(rs5c372); |
|
if (unlikely(err < 0)) { |
|
dev_err(&client->dev, "setup error\n"); |
|
goto exit; |
|
} |
|
|
|
dev_info(&client->dev, "%s found, %s\n", |
|
({ char *s; switch (rs5c372->type) { |
|
case rtc_r2025sd: s = "r2025sd"; break; |
|
case rtc_r2221tl: s = "r2221tl"; break; |
|
case rtc_rs5c372a: s = "rs5c372a"; break; |
|
case rtc_rs5c372b: s = "rs5c372b"; break; |
|
case rtc_rv5c386: s = "rv5c386"; break; |
|
case rtc_rv5c387a: s = "rv5c387a"; break; |
|
default: s = "chip"; break; |
|
}; s;}), |
|
rs5c372->time24 ? "24hr" : "am/pm" |
|
); |
|
|
|
/* REVISIT use client->irq to register alarm irq ... */ |
|
rs5c372->rtc = devm_rtc_device_register(&client->dev, |
|
rs5c372_driver.driver.name, |
|
&rs5c372_rtc_ops, THIS_MODULE); |
|
|
|
if (IS_ERR(rs5c372->rtc)) { |
|
err = PTR_ERR(rs5c372->rtc); |
|
goto exit; |
|
} |
|
|
|
err = rs5c_sysfs_register(&client->dev); |
|
if (err) |
|
goto exit; |
|
|
|
return 0; |
|
|
|
exit: |
|
return err; |
|
} |
|
|
|
static int rs5c372_remove(struct i2c_client *client) |
|
{ |
|
rs5c_sysfs_unregister(&client->dev); |
|
return 0; |
|
} |
|
|
|
static struct i2c_driver rs5c372_driver = { |
|
.driver = { |
|
.name = "rtc-rs5c372", |
|
.of_match_table = of_match_ptr(rs5c372_of_match), |
|
}, |
|
.probe = rs5c372_probe, |
|
.remove = rs5c372_remove, |
|
.id_table = rs5c372_id, |
|
}; |
|
|
|
module_i2c_driver(rs5c372_driver); |
|
|
|
MODULE_AUTHOR( |
|
"Pavel Mironchik <[email protected]>, " |
|
"Alessandro Zummo <[email protected]>, " |
|
"Paul Mundt <[email protected]>"); |
|
MODULE_DESCRIPTION("Ricoh RS5C372 RTC driver"); |
|
MODULE_LICENSE("GPL");
|
|
|