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path: root/drivers/rtc/rtc-ds1307.c
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Diffstat (limited to 'drivers/rtc/rtc-ds1307.c')
-rw-r--r--drivers/rtc/rtc-ds1307.c707
1 files changed, 352 insertions, 355 deletions
diff --git a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c
index 74b31dce484f..07530fe1da2a 100644
--- a/drivers/rtc/rtc-ds1307.c
+++ b/drivers/rtc/rtc-ds1307.c
@@ -114,6 +114,33 @@ enum ds_type {
# define RX8025_BIT_VDET 0x40
# define RX8025_BIT_XST 0x20
+#define RX8130_REG_ALARM_MIN 0x17
+#define RX8130_REG_ALARM_HOUR 0x18
+#define RX8130_REG_ALARM_WEEK_OR_DAY 0x19
+#define RX8130_REG_EXTENSION 0x1c
+#define RX8130_REG_EXTENSION_WADA BIT(3)
+#define RX8130_REG_FLAG 0x1d
+#define RX8130_REG_FLAG_VLF BIT(1)
+#define RX8130_REG_FLAG_AF BIT(3)
+#define RX8130_REG_CONTROL0 0x1e
+#define RX8130_REG_CONTROL0_AIE BIT(3)
+
+#define MCP794XX_REG_CONTROL 0x07
+# define MCP794XX_BIT_ALM0_EN 0x10
+# define MCP794XX_BIT_ALM1_EN 0x20
+#define MCP794XX_REG_ALARM0_BASE 0x0a
+#define MCP794XX_REG_ALARM0_CTRL 0x0d
+#define MCP794XX_REG_ALARM1_BASE 0x11
+#define MCP794XX_REG_ALARM1_CTRL 0x14
+# define MCP794XX_BIT_ALMX_IF BIT(3)
+# define MCP794XX_BIT_ALMX_C0 BIT(4)
+# define MCP794XX_BIT_ALMX_C1 BIT(5)
+# define MCP794XX_BIT_ALMX_C2 BIT(6)
+# define MCP794XX_BIT_ALMX_POL BIT(7)
+# define MCP794XX_MSK_ALMX_MATCH (MCP794XX_BIT_ALMX_C0 | \
+ MCP794XX_BIT_ALMX_C1 | \
+ MCP794XX_BIT_ALMX_C2)
+
#define M41TXX_REG_CONTROL 0x07
# define M41TXX_BIT_OUT BIT(7)
# define M41TXX_BIT_FT BIT(6)
@@ -158,289 +185,7 @@ struct chip_desc {
bool);
};
-static int ds1307_get_time(struct device *dev, struct rtc_time *t);
-static int ds1307_set_time(struct device *dev, struct rtc_time *t);
-static int ds1337_read_alarm(struct device *dev, struct rtc_wkalrm *t);
-static int ds1337_set_alarm(struct device *dev, struct rtc_wkalrm *t);
-static int ds1307_alarm_irq_enable(struct device *dev, unsigned int enabled);
-static u8 do_trickle_setup_ds1339(struct ds1307 *, u32 ohms, bool diode);
-static irqreturn_t rx8130_irq(int irq, void *dev_id);
-static int rx8130_read_alarm(struct device *dev, struct rtc_wkalrm *t);
-static int rx8130_set_alarm(struct device *dev, struct rtc_wkalrm *t);
-static int rx8130_alarm_irq_enable(struct device *dev, unsigned int enabled);
-static irqreturn_t mcp794xx_irq(int irq, void *dev_id);
-static int mcp794xx_read_alarm(struct device *dev, struct rtc_wkalrm *t);
-static int mcp794xx_set_alarm(struct device *dev, struct rtc_wkalrm *t);
-static int mcp794xx_alarm_irq_enable(struct device *dev, unsigned int enabled);
-static int m41txx_rtc_read_offset(struct device *dev, long *offset);
-static int m41txx_rtc_set_offset(struct device *dev, long offset);
-
-static const struct rtc_class_ops rx8130_rtc_ops = {
- .read_time = ds1307_get_time,
- .set_time = ds1307_set_time,
- .read_alarm = rx8130_read_alarm,
- .set_alarm = rx8130_set_alarm,
- .alarm_irq_enable = rx8130_alarm_irq_enable,
-};
-
-static const struct rtc_class_ops mcp794xx_rtc_ops = {
- .read_time = ds1307_get_time,
- .set_time = ds1307_set_time,
- .read_alarm = mcp794xx_read_alarm,
- .set_alarm = mcp794xx_set_alarm,
- .alarm_irq_enable = mcp794xx_alarm_irq_enable,
-};
-
-static const struct rtc_class_ops m41txx_rtc_ops = {
- .read_time = ds1307_get_time,
- .set_time = ds1307_set_time,
- .read_alarm = ds1337_read_alarm,
- .set_alarm = ds1337_set_alarm,
- .alarm_irq_enable = ds1307_alarm_irq_enable,
- .read_offset = m41txx_rtc_read_offset,
- .set_offset = m41txx_rtc_set_offset,
-};
-
-static const struct chip_desc chips[last_ds_type] = {
- [ds_1307] = {
- .nvram_offset = 8,
- .nvram_size = 56,
- },
- [ds_1308] = {
- .nvram_offset = 8,
- .nvram_size = 56,
- },
- [ds_1337] = {
- .alarm = 1,
- .century_reg = DS1307_REG_MONTH,
- .century_bit = DS1337_BIT_CENTURY,
- },
- [ds_1338] = {
- .nvram_offset = 8,
- .nvram_size = 56,
- },
- [ds_1339] = {
- .alarm = 1,
- .century_reg = DS1307_REG_MONTH,
- .century_bit = DS1337_BIT_CENTURY,
- .bbsqi_bit = DS1339_BIT_BBSQI,
- .trickle_charger_reg = 0x10,
- .do_trickle_setup = &do_trickle_setup_ds1339,
- },
- [ds_1340] = {
- .century_reg = DS1307_REG_HOUR,
- .century_enable_bit = DS1340_BIT_CENTURY_EN,
- .century_bit = DS1340_BIT_CENTURY,
- .do_trickle_setup = &do_trickle_setup_ds1339,
- .trickle_charger_reg = 0x08,
- },
- [ds_1341] = {
- .century_reg = DS1307_REG_MONTH,
- .century_bit = DS1337_BIT_CENTURY,
- },
- [ds_1388] = {
- .offset = 1,
- .trickle_charger_reg = 0x0a,
- },
- [ds_3231] = {
- .alarm = 1,
- .century_reg = DS1307_REG_MONTH,
- .century_bit = DS1337_BIT_CENTURY,
- .bbsqi_bit = DS3231_BIT_BBSQW,
- },
- [rx_8130] = {
- .alarm = 1,
- /* this is battery backed SRAM */
- .nvram_offset = 0x20,
- .nvram_size = 4, /* 32bit (4 word x 8 bit) */
- .offset = 0x10,
- .irq_handler = rx8130_irq,
- .rtc_ops = &rx8130_rtc_ops,
- },
- [m41t0] = {
- .rtc_ops = &m41txx_rtc_ops,
- },
- [m41t00] = {
- .rtc_ops = &m41txx_rtc_ops,
- },
- [m41t11] = {
- /* this is battery backed SRAM */
- .nvram_offset = 8,
- .nvram_size = 56,
- .rtc_ops = &m41txx_rtc_ops,
- },
- [mcp794xx] = {
- .alarm = 1,
- /* this is battery backed SRAM */
- .nvram_offset = 0x20,
- .nvram_size = 0x40,
- .irq_handler = mcp794xx_irq,
- .rtc_ops = &mcp794xx_rtc_ops,
- },
-};
-
-static const struct i2c_device_id ds1307_id[] = {
- { "ds1307", ds_1307 },
- { "ds1308", ds_1308 },
- { "ds1337", ds_1337 },
- { "ds1338", ds_1338 },
- { "ds1339", ds_1339 },
- { "ds1388", ds_1388 },
- { "ds1340", ds_1340 },
- { "ds1341", ds_1341 },
- { "ds3231", ds_3231 },
- { "m41t0", m41t0 },
- { "m41t00", m41t00 },
- { "m41t11", m41t11 },
- { "mcp7940x", mcp794xx },
- { "mcp7941x", mcp794xx },
- { "pt7c4338", ds_1307 },
- { "rx8025", rx_8025 },
- { "isl12057", ds_1337 },
- { "rx8130", rx_8130 },
- { }
-};
-MODULE_DEVICE_TABLE(i2c, ds1307_id);
-
-#ifdef CONFIG_OF
-static const struct of_device_id ds1307_of_match[] = {
- {
- .compatible = "dallas,ds1307",
- .data = (void *)ds_1307
- },
- {
- .compatible = "dallas,ds1308",
- .data = (void *)ds_1308
- },
- {
- .compatible = "dallas,ds1337",
- .data = (void *)ds_1337
- },
- {
- .compatible = "dallas,ds1338",
- .data = (void *)ds_1338
- },
- {
- .compatible = "dallas,ds1339",
- .data = (void *)ds_1339
- },
- {
- .compatible = "dallas,ds1388",
- .data = (void *)ds_1388
- },
- {
- .compatible = "dallas,ds1340",
- .data = (void *)ds_1340
- },
- {
- .compatible = "dallas,ds1341",
- .data = (void *)ds_1341
- },
- {
- .compatible = "maxim,ds3231",
- .data = (void *)ds_3231
- },
- {
- .compatible = "st,m41t0",
- .data = (void *)m41t0
- },
- {
- .compatible = "st,m41t00",
- .data = (void *)m41t00
- },
- {
- .compatible = "st,m41t11",
- .data = (void *)m41t11
- },
- {
- .compatible = "microchip,mcp7940x",
- .data = (void *)mcp794xx
- },
- {
- .compatible = "microchip,mcp7941x",
- .data = (void *)mcp794xx
- },
- {
- .compatible = "pericom,pt7c4338",
- .data = (void *)ds_1307
- },
- {
- .compatible = "epson,rx8025",
- .data = (void *)rx_8025
- },
- {
- .compatible = "isil,isl12057",
- .data = (void *)ds_1337
- },
- {
- .compatible = "epson,rx8130",
- .data = (void *)rx_8130
- },
- { }
-};
-MODULE_DEVICE_TABLE(of, ds1307_of_match);
-#endif
-
-#ifdef CONFIG_ACPI
-static const struct acpi_device_id ds1307_acpi_ids[] = {
- { .id = "DS1307", .driver_data = ds_1307 },
- { .id = "DS1308", .driver_data = ds_1308 },
- { .id = "DS1337", .driver_data = ds_1337 },
- { .id = "DS1338", .driver_data = ds_1338 },
- { .id = "DS1339", .driver_data = ds_1339 },
- { .id = "DS1388", .driver_data = ds_1388 },
- { .id = "DS1340", .driver_data = ds_1340 },
- { .id = "DS1341", .driver_data = ds_1341 },
- { .id = "DS3231", .driver_data = ds_3231 },
- { .id = "M41T0", .driver_data = m41t0 },
- { .id = "M41T00", .driver_data = m41t00 },
- { .id = "M41T11", .driver_data = m41t11 },
- { .id = "MCP7940X", .driver_data = mcp794xx },
- { .id = "MCP7941X", .driver_data = mcp794xx },
- { .id = "PT7C4338", .driver_data = ds_1307 },
- { .id = "RX8025", .driver_data = rx_8025 },
- { .id = "ISL12057", .driver_data = ds_1337 },
- { .id = "RX8130", .driver_data = rx_8130 },
- { }
-};
-MODULE_DEVICE_TABLE(acpi, ds1307_acpi_ids);
-#endif
-
-/*
- * The ds1337 and ds1339 both have two alarms, but we only use the first
- * one (with a "seconds" field). For ds1337 we expect nINTA is our alarm
- * signal; ds1339 chips have only one alarm signal.
- */
-static irqreturn_t ds1307_irq(int irq, void *dev_id)
-{
- struct ds1307 *ds1307 = dev_id;
- struct mutex *lock = &ds1307->rtc->ops_lock;
- int stat, ret;
-
- mutex_lock(lock);
- ret = regmap_read(ds1307->regmap, DS1337_REG_STATUS, &stat);
- if (ret)
- goto out;
-
- if (stat & DS1337_BIT_A1I) {
- stat &= ~DS1337_BIT_A1I;
- regmap_write(ds1307->regmap, DS1337_REG_STATUS, stat);
-
- ret = regmap_update_bits(ds1307->regmap, DS1337_REG_CONTROL,
- DS1337_BIT_A1IE, 0);
- if (ret)
- goto out;
-
- rtc_update_irq(ds1307->rtc, 1, RTC_AF | RTC_IRQF);
- }
-
-out:
- mutex_unlock(lock);
-
- return IRQ_HANDLED;
-}
-
-/*----------------------------------------------------------------------*/
+static const struct chip_desc chips[last_ds_type];
static int ds1307_get_time(struct device *dev, struct rtc_time *t)
{
@@ -449,6 +194,20 @@ static int ds1307_get_time(struct device *dev, struct rtc_time *t)
const struct chip_desc *chip = &chips[ds1307->type];
u8 regs[7];
+ if (ds1307->type == rx_8130) {
+ unsigned int regflag;
+ ret = regmap_read(ds1307->regmap, RX8130_REG_FLAG, &regflag);
+ if (ret) {
+ dev_err(dev, "%s error %d\n", "read", ret);
+ return ret;
+ }
+
+ if (regflag & RX8130_REG_FLAG_VLF) {
+ dev_warn_once(dev, "oscillator failed, set time!\n");
+ return -EINVAL;
+ }
+ }
+
/* read the RTC date and time registers all at once */
ret = regmap_bulk_read(ds1307->regmap, chip->offset, regs,
sizeof(regs));
@@ -548,6 +307,17 @@ static int ds1307_set_time(struct device *dev, struct rtc_time *t)
dev_err(dev, "%s error %d\n", "write", result);
return result;
}
+
+ if (ds1307->type == rx_8130) {
+ /* clear Voltage Loss Flag as data is available now */
+ result = regmap_write(ds1307->regmap, RX8130_REG_FLAG,
+ ~(u8)RX8130_REG_FLAG_VLF);
+ if (result) {
+ dev_err(dev, "%s error %d\n", "write", result);
+ return result;
+ }
+ }
+
return 0;
}
@@ -666,29 +436,28 @@ static int ds1307_alarm_irq_enable(struct device *dev, unsigned int enabled)
enabled ? DS1337_BIT_A1IE : 0);
}
-static const struct rtc_class_ops ds13xx_rtc_ops = {
- .read_time = ds1307_get_time,
- .set_time = ds1307_set_time,
- .read_alarm = ds1337_read_alarm,
- .set_alarm = ds1337_set_alarm,
- .alarm_irq_enable = ds1307_alarm_irq_enable,
-};
-
-/*----------------------------------------------------------------------*/
-
-/*
- * Alarm support for rx8130 devices.
- */
+static u8 do_trickle_setup_ds1339(struct ds1307 *ds1307, u32 ohms, bool diode)
+{
+ u8 setup = (diode) ? DS1307_TRICKLE_CHARGER_DIODE :
+ DS1307_TRICKLE_CHARGER_NO_DIODE;
-#define RX8130_REG_ALARM_MIN 0x07
-#define RX8130_REG_ALARM_HOUR 0x08
-#define RX8130_REG_ALARM_WEEK_OR_DAY 0x09
-#define RX8130_REG_EXTENSION 0x0c
-#define RX8130_REG_EXTENSION_WADA BIT(3)
-#define RX8130_REG_FLAG 0x0d
-#define RX8130_REG_FLAG_AF BIT(3)
-#define RX8130_REG_CONTROL0 0x0e
-#define RX8130_REG_CONTROL0_AIE BIT(3)
+ switch (ohms) {
+ case 250:
+ setup |= DS1307_TRICKLE_CHARGER_250_OHM;
+ break;
+ case 2000:
+ setup |= DS1307_TRICKLE_CHARGER_2K_OHM;
+ break;
+ case 4000:
+ setup |= DS1307_TRICKLE_CHARGER_4K_OHM;
+ break;
+ default:
+ dev_warn(ds1307->dev,
+ "Unsupported ohm value %u in dt\n", ohms);
+ return 0;
+ }
+ return setup;
+}
static irqreturn_t rx8130_irq(int irq, void *dev_id)
{
@@ -785,8 +554,8 @@ static int rx8130_set_alarm(struct device *dev, struct rtc_wkalrm *t)
if (ret < 0)
return ret;
- ctl[0] &= ~RX8130_REG_EXTENSION_WADA;
- ctl[1] |= RX8130_REG_FLAG_AF;
+ ctl[0] &= RX8130_REG_EXTENSION_WADA;
+ ctl[1] &= ~RX8130_REG_FLAG_AF;
ctl[2] &= ~RX8130_REG_CONTROL0_AIE;
ret = regmap_bulk_write(ds1307->regmap, RX8130_REG_EXTENSION, ctl,
@@ -809,8 +578,7 @@ static int rx8130_set_alarm(struct device *dev, struct rtc_wkalrm *t)
ctl[2] |= RX8130_REG_CONTROL0_AIE;
- return regmap_bulk_write(ds1307->regmap, RX8130_REG_EXTENSION, ctl,
- sizeof(ctl));
+ return regmap_write(ds1307->regmap, RX8130_REG_CONTROL0, ctl[2]);
}
static int rx8130_alarm_irq_enable(struct device *dev, unsigned int enabled)
@@ -833,28 +601,6 @@ static int rx8130_alarm_irq_enable(struct device *dev, unsigned int enabled)
return regmap_write(ds1307->regmap, RX8130_REG_CONTROL0, reg);
}
-/*----------------------------------------------------------------------*/
-
-/*
- * Alarm support for mcp794xx devices.
- */
-
-#define MCP794XX_REG_CONTROL 0x07
-# define MCP794XX_BIT_ALM0_EN 0x10
-# define MCP794XX_BIT_ALM1_EN 0x20
-#define MCP794XX_REG_ALARM0_BASE 0x0a
-#define MCP794XX_REG_ALARM0_CTRL 0x0d
-#define MCP794XX_REG_ALARM1_BASE 0x11
-#define MCP794XX_REG_ALARM1_CTRL 0x14
-# define MCP794XX_BIT_ALMX_IF BIT(3)
-# define MCP794XX_BIT_ALMX_C0 BIT(4)
-# define MCP794XX_BIT_ALMX_C1 BIT(5)
-# define MCP794XX_BIT_ALMX_C2 BIT(6)
-# define MCP794XX_BIT_ALMX_POL BIT(7)
-# define MCP794XX_MSK_ALMX_MATCH (MCP794XX_BIT_ALMX_C0 | \
- MCP794XX_BIT_ALMX_C1 | \
- MCP794XX_BIT_ALMX_C2)
-
static irqreturn_t mcp794xx_irq(int irq, void *dev_id)
{
struct ds1307 *ds1307 = dev_id;
@@ -1050,6 +796,281 @@ static int m41txx_rtc_set_offset(struct device *dev, long offset)
ctrl_reg);
}
+static const struct rtc_class_ops rx8130_rtc_ops = {
+ .read_time = ds1307_get_time,
+ .set_time = ds1307_set_time,
+ .read_alarm = rx8130_read_alarm,
+ .set_alarm = rx8130_set_alarm,
+ .alarm_irq_enable = rx8130_alarm_irq_enable,
+};
+
+static const struct rtc_class_ops mcp794xx_rtc_ops = {
+ .read_time = ds1307_get_time,
+ .set_time = ds1307_set_time,
+ .read_alarm = mcp794xx_read_alarm,
+ .set_alarm = mcp794xx_set_alarm,
+ .alarm_irq_enable = mcp794xx_alarm_irq_enable,
+};
+
+static const struct rtc_class_ops m41txx_rtc_ops = {
+ .read_time = ds1307_get_time,
+ .set_time = ds1307_set_time,
+ .read_alarm = ds1337_read_alarm,
+ .set_alarm = ds1337_set_alarm,
+ .alarm_irq_enable = ds1307_alarm_irq_enable,
+ .read_offset = m41txx_rtc_read_offset,
+ .set_offset = m41txx_rtc_set_offset,
+};
+
+static const struct chip_desc chips[last_ds_type] = {
+ [ds_1307] = {
+ .nvram_offset = 8,
+ .nvram_size = 56,
+ },
+ [ds_1308] = {
+ .nvram_offset = 8,
+ .nvram_size = 56,
+ },
+ [ds_1337] = {
+ .alarm = 1,
+ .century_reg = DS1307_REG_MONTH,
+ .century_bit = DS1337_BIT_CENTURY,
+ },
+ [ds_1338] = {
+ .nvram_offset = 8,
+ .nvram_size = 56,
+ },
+ [ds_1339] = {
+ .alarm = 1,
+ .century_reg = DS1307_REG_MONTH,
+ .century_bit = DS1337_BIT_CENTURY,
+ .bbsqi_bit = DS1339_BIT_BBSQI,
+ .trickle_charger_reg = 0x10,
+ .do_trickle_setup = &do_trickle_setup_ds1339,
+ },
+ [ds_1340] = {
+ .century_reg = DS1307_REG_HOUR,
+ .century_enable_bit = DS1340_BIT_CENTURY_EN,
+ .century_bit = DS1340_BIT_CENTURY,
+ .do_trickle_setup = &do_trickle_setup_ds1339,
+ .trickle_charger_reg = 0x08,
+ },
+ [ds_1341] = {
+ .century_reg = DS1307_REG_MONTH,
+ .century_bit = DS1337_BIT_CENTURY,
+ },
+ [ds_1388] = {
+ .offset = 1,
+ .trickle_charger_reg = 0x0a,
+ },
+ [ds_3231] = {
+ .alarm = 1,
+ .century_reg = DS1307_REG_MONTH,
+ .century_bit = DS1337_BIT_CENTURY,
+ .bbsqi_bit = DS3231_BIT_BBSQW,
+ },
+ [rx_8130] = {
+ .alarm = 1,
+ /* this is battery backed SRAM */
+ .nvram_offset = 0x20,
+ .nvram_size = 4, /* 32bit (4 word x 8 bit) */
+ .offset = 0x10,
+ .irq_handler = rx8130_irq,
+ .rtc_ops = &rx8130_rtc_ops,
+ },
+ [m41t0] = {
+ .rtc_ops = &m41txx_rtc_ops,
+ },
+ [m41t00] = {
+ .rtc_ops = &m41txx_rtc_ops,
+ },
+ [m41t11] = {
+ /* this is battery backed SRAM */
+ .nvram_offset = 8,
+ .nvram_size = 56,
+ .rtc_ops = &m41txx_rtc_ops,
+ },
+ [mcp794xx] = {
+ .alarm = 1,
+ /* this is battery backed SRAM */
+ .nvram_offset = 0x20,
+ .nvram_size = 0x40,
+ .irq_handler = mcp794xx_irq,
+ .rtc_ops = &mcp794xx_rtc_ops,
+ },
+};
+
+static const struct i2c_device_id ds1307_id[] = {
+ { "ds1307", ds_1307 },
+ { "ds1308", ds_1308 },
+ { "ds1337", ds_1337 },
+ { "ds1338", ds_1338 },
+ { "ds1339", ds_1339 },
+ { "ds1388", ds_1388 },
+ { "ds1340", ds_1340 },
+ { "ds1341", ds_1341 },
+ { "ds3231", ds_3231 },
+ { "m41t0", m41t0 },
+ { "m41t00", m41t00 },
+ { "m41t11", m41t11 },
+ { "mcp7940x", mcp794xx },
+ { "mcp7941x", mcp794xx },
+ { "pt7c4338", ds_1307 },
+ { "rx8025", rx_8025 },
+ { "isl12057", ds_1337 },
+ { "rx8130", rx_8130 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, ds1307_id);
+
+#ifdef CONFIG_OF
+static const struct of_device_id ds1307_of_match[] = {
+ {
+ .compatible = "dallas,ds1307",
+ .data = (void *)ds_1307
+ },
+ {
+ .compatible = "dallas,ds1308",
+ .data = (void *)ds_1308
+ },
+ {
+ .compatible = "dallas,ds1337",
+ .data = (void *)ds_1337
+ },
+ {
+ .compatible = "dallas,ds1338",
+ .data = (void *)ds_1338
+ },
+ {
+ .compatible = "dallas,ds1339",
+ .data = (void *)ds_1339
+ },
+ {
+ .compatible = "dallas,ds1388",
+ .data = (void *)ds_1388
+ },
+ {
+ .compatible = "dallas,ds1340",
+ .data = (void *)ds_1340
+ },
+ {
+ .compatible = "dallas,ds1341",
+ .data = (void *)ds_1341
+ },
+ {
+ .compatible = "maxim,ds3231",
+ .data = (void *)ds_3231
+ },
+ {
+ .compatible = "st,m41t0",
+ .data = (void *)m41t0
+ },
+ {
+ .compatible = "st,m41t00",
+ .data = (void *)m41t00
+ },
+ {
+ .compatible = "st,m41t11",
+ .data = (void *)m41t11
+ },
+ {
+ .compatible = "microchip,mcp7940x",
+ .data = (void *)mcp794xx
+ },
+ {
+ .compatible = "microchip,mcp7941x",
+ .data = (void *)mcp794xx
+ },
+ {
+ .compatible = "pericom,pt7c4338",
+ .data = (void *)ds_1307
+ },
+ {
+ .compatible = "epson,rx8025",
+ .data = (void *)rx_8025
+ },
+ {
+ .compatible = "isil,isl12057",
+ .data = (void *)ds_1337
+ },
+ {
+ .compatible = "epson,rx8130",
+ .data = (void *)rx_8130
+ },
+ { }
+};
+MODULE_DEVICE_TABLE(of, ds1307_of_match);
+#endif
+
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id ds1307_acpi_ids[] = {
+ { .id = "DS1307", .driver_data = ds_1307 },
+ { .id = "DS1308", .driver_data = ds_1308 },
+ { .id = "DS1337", .driver_data = ds_1337 },
+ { .id = "DS1338", .driver_data = ds_1338 },
+ { .id = "DS1339", .driver_data = ds_1339 },
+ { .id = "DS1388", .driver_data = ds_1388 },
+ { .id = "DS1340", .driver_data = ds_1340 },
+ { .id = "DS1341", .driver_data = ds_1341 },
+ { .id = "DS3231", .driver_data = ds_3231 },
+ { .id = "M41T0", .driver_data = m41t0 },
+ { .id = "M41T00", .driver_data = m41t00 },
+ { .id = "M41T11", .driver_data = m41t11 },
+ { .id = "MCP7940X", .driver_data = mcp794xx },
+ { .id = "MCP7941X", .driver_data = mcp794xx },
+ { .id = "PT7C4338", .driver_data = ds_1307 },
+ { .id = "RX8025", .driver_data = rx_8025 },
+ { .id = "ISL12057", .driver_data = ds_1337 },
+ { .id = "RX8130", .driver_data = rx_8130 },
+ { }
+};
+MODULE_DEVICE_TABLE(acpi, ds1307_acpi_ids);
+#endif
+
+/*
+ * The ds1337 and ds1339 both have two alarms, but we only use the first
+ * one (with a "seconds" field). For ds1337 we expect nINTA is our alarm
+ * signal; ds1339 chips have only one alarm signal.
+ */
+static irqreturn_t ds1307_irq(int irq, void *dev_id)
+{
+ struct ds1307 *ds1307 = dev_id;
+ struct mutex *lock = &ds1307->rtc->ops_lock;
+ int stat, ret;
+
+ mutex_lock(lock);
+ ret = regmap_read(ds1307->regmap, DS1337_REG_STATUS, &stat);
+ if (ret)
+ goto out;
+
+ if (stat & DS1337_BIT_A1I) {
+ stat &= ~DS1337_BIT_A1I;
+ regmap_write(ds1307->regmap, DS1337_REG_STATUS, stat);
+
+ ret = regmap_update_bits(ds1307->regmap, DS1337_REG_CONTROL,
+ DS1337_BIT_A1IE, 0);
+ if (ret)
+ goto out;
+
+ rtc_update_irq(ds1307->rtc, 1, RTC_AF | RTC_IRQF);
+ }
+
+out:
+ mutex_unlock(lock);
+
+ return IRQ_HANDLED;
+}
+
+/*----------------------------------------------------------------------*/
+
+static const struct rtc_class_ops ds13xx_rtc_ops = {
+ .read_time = ds1307_get_time,
+ .set_time = ds1307_set_time,
+ .read_alarm = ds1337_read_alarm,
+ .set_alarm = ds1337_set_alarm,
+ .alarm_irq_enable = ds1307_alarm_irq_enable,
+};
+
static ssize_t frequency_test_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
@@ -1137,30 +1158,6 @@ static int ds1307_nvram_write(void *priv, unsigned int offset, void *val,
/*----------------------------------------------------------------------*/
-static u8 do_trickle_setup_ds1339(struct ds1307 *ds1307,
- u32 ohms, bool diode)
-{
- u8 setup = (diode) ? DS1307_TRICKLE_CHARGER_DIODE :
- DS1307_TRICKLE_CHARGER_NO_DIODE;
-
- switch (ohms) {
- case 250:
- setup |= DS1307_TRICKLE_CHARGER_250_OHM;
- break;
- case 2000:
- setup |= DS1307_TRICKLE_CHARGER_2K_OHM;
- break;
- case 4000:
- setup |= DS1307_TRICKLE_CHARGER_4K_OHM;
- break;
- default:
- dev_warn(ds1307->dev,
- "Unsupported ohm value %u in dt\n", ohms);
- return 0;
- }
- return setup;
-}
-
static u8 ds1307_trickle_init(struct ds1307 *ds1307,
const struct chip_desc *chip)
{
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.