Hi David,
> Yes, the patch you sent (switching to "method 3" to work around the
> evident bug in the i2c-ixp3xx driver) works on the platform I was
> using too (after unrelated tweaks).
> Here's an updated patch, using "method 3". If it still behaves
> for you, it'd seem ready to merge...
Works fine, thanks! Unfortunately the i2c-ixp3xx issue has not advanced in
the meantime, so we still need the third method.
> ============ CUT HERE
> Update the rtc-rs5c372 driver:
>
> Bugfixes:
> - Handle RTCs which are configured to use 12-hour mode.
> - Never report bogus/un-initialized times.
> - Displaying "raw trim" requires not masking it first!
> - Fix the and sysfs procfs display of crystal and trim data.
>
> Features:
> - Handle other RTCs in this family, notably rv5c386/rv5c387.
> - Declare the other registers.
> - Provide alarm get/set functionality.
> - Handle AIE and UIE; but no IRQ handling yet.
> - Warn if the clock needs to be set.
>
> Cleanup:
> - Shrink object by not including needless sysfs or procfs support
> - We don't need no steenkin' forward declarations. (Except one.)
>
> Until the I2C framework merges "new style" driver support, matching
> the driver model better, using rv5c chips or alarm IRQs requires a
> separate board-specific patch. (And an IRQ handler, handing off labor
> through a work_struct...)
>
> This uses the "method 3" register reads, but notes that it's done
> to work around an evident i2c adapter driver bug, and the curious
> issue where the chip behavior disagrees with the chip docs.
>
> Signed-off-by: David Brownell <[email protected]>
>
> Index: g26/drivers/rtc/rtc-rs5c372.c
> ===================================================================
> --- g26.orig/drivers/rtc/rtc-rs5c372.c 2006-12-27 17:19:55.000000000 -0800
> +++ g26/drivers/rtc/rtc-rs5c372.c 2007-01-02 18:44:35.000000000 -0800
> @@ -1,5 +1,5 @@
> /*
> - * An I2C driver for the Ricoh RS5C372 RTC
> + * An I2C driver for Ricoh RS5C372 and RV5C38[67] RTCs
> *
> * Copyright (C) 2005 Pavel Mironchik <[email protected]>
> * Copyright (C) 2006 Tower Technologies
> @@ -13,7 +13,7 @@
> #include <linux/rtc.h>
> #include <linux/bcd.h>
>
> -#define DRV_VERSION "0.3"
> +#define DRV_VERSION "0.4"
>
> /* Addresses to scan */
> static unsigned short normal_i2c[] = { /* 0x32,*/ I2C_CLIENT_END };
> @@ -21,6 +21,13 @@ static unsigned short normal_i2c[] = { /
> /* Insmod parameters */
> I2C_CLIENT_INSMOD;
>
> +
> +/*
> + * Ricoh has a family of I2C based RTCs, which differ only slightly from
> + * each other. Differences center on pinout (e.g. how many interrupts,
> + * output clock, etc) and how the control registers are used. The '372
> + * is significant only because that's the one this driver first
> supported.
> + */
> #define RS5C372_REG_SECS 0
> #define RS5C372_REG_MINS 1
> #define RS5C372_REG_HOURS 2
> @@ -29,59 +36,142 @@ I2C_CLIENT_INSMOD;
> #define RS5C372_REG_MONTH 5
> #define RS5C372_REG_YEAR 6
> #define RS5C372_REG_TRIM 7
> +# define RS5C372_TRIM_XSL 0x80
> +# define RS5C372_TRIM_MASK 0x7F
>
> -#define RS5C372_TRIM_XSL 0x80
> -#define RS5C372_TRIM_MASK 0x7F
> -
> -#define RS5C372_REG_BASE 0
> -
> -static int rs5c372_attach(struct i2c_adapter *adapter);
> -static int rs5c372_detach(struct i2c_client *client);
> -static int rs5c372_probe(struct i2c_adapter *adapter, int address, int
> kind);
> +#define RS5C_REG_ALARM_A_MIN 8 /* or ALARM_W */
> +#define RS5C_REG_ALARM_A_HOURS 9
> +#define RS5C_REG_ALARM_A_WDAY 10
> +
> +#define RS5C_REG_ALARM_B_MIN 11 /* or ALARM_D */
> +#define RS5C_REG_ALARM_B_HOURS 12
> +#define RS5C_REG_ALARM_B_WDAY 13 /* (ALARM_B only) */
> +
> +#define RS5C_REG_CTRL1 14
> +# define RS5C_CTRL1_AALE (1 << 7) /* or WALE */
> +# define RS5C_CTRL1_BALE (1 << 6) /* or DALE */
> +# define RV5C387_CTRL1_24 (1 << 5)
> +# define RS5C372A_CTRL1_SL1 (1 << 5)
> +# define RS5C_CTRL1_CT_MASK (7 << 0)
> +# define RS5C_CTRL1_CT0 (0 << 0) /* no periodic irq */
> +# define RS5C_CTRL1_CT4 (4 << 0) /* 1 Hz level irq */
> +#define RS5C_REG_CTRL2 15
> +# define RS5C372_CTRL2_24 (1 << 5)
> +# define RS5C_CTRL2_XSTP (1 << 4)
> +# define RS5C_CTRL2_CTFG (1 << 2)
> +# define RS5C_CTRL2_AAFG (1 << 1) /* or WAFG */
> +# define RS5C_CTRL2_BAFG (1 << 0) /* or DAFG */
> +
> +
> +/* to read (style 1) or write registers starting at R */
> +#define RS5C_ADDR(R) (((R) << 4) | 0)
> +
> +
> +enum rtc_type {
> + rtc_undef = 0,
> + rtc_rs5c372a,
> + rtc_rs5c372b,
> + rtc_rv5c386,
> + rtc_rv5c387a,
> +};
>
> +/* REVISIT: this assumes that:
> + * - we're in the 21st century, so it's safe to ignore the century
> + * bit for rv5c38[67] (REG_MONTH bit 7);
> + * - we should use ALARM_A not ALARM_B (may be wrong on some boards)
> + */
> struct rs5c372 {
> - u8 reg_addr;
> - u8 regs[17];
> - struct i2c_msg msg[1];
> - struct i2c_client client;
> - struct rtc_device *rtc;
> -};
> + struct i2c_client *client;
> + struct rtc_device *rtc;
> + enum rtc_type type;
> + unsigned time24:1;
> + unsigned has_irq:1;
> + char buf[17];
> + char *regs;
>
> -static struct i2c_driver rs5c372_driver = {
> - .driver = {
> - .name = "rs5c372",
> - },
> - .attach_adapter = &rs5c372_attach,
> - .detach_client = &rs5c372_detach,
> + /* on conversion to a "new style" i2c driver, this vanishes */
> + struct i2c_client dev;
> };
>
> -static int rs5c372_get_datetime(struct i2c_client *client, struct
> rtc_time *tm)
> +static int rs5c_get_regs(struct rs5c372 *rs5c)
> {
> -
> - struct rs5c372 *rs5c372 = i2c_get_clientdata(client);
> - u8 *buf = &(rs5c372->regs[1]);
> -
> - /* this implements the 3rd reading method, according
> - * to the datasheet. rs5c372 defaults to internal
> - * address 0xF, so 0x0 is in regs[1]
> + struct i2c_client *client = rs5c->client;
> + struct i2c_msg msgs[] = {
> + { client->addr, I2C_M_RD, sizeof rs5c->buf, rs5c->buf },
> + };
> +
> + /* This implements the third reading method from the datasheet, using
> + * an internal address that's reset after each transaction (by STOP)
> + * to 0x0f ... so we read extra registers, and skip the first one.
> + *
> + * The first method doesn't work with the iop3xx adapter driver, on at
> + * least 80219 chips; this works around that bug.
> */
> -
> - if ((i2c_transfer(client->adapter, rs5c372->msg, 1)) != 1) {
> - dev_err(&client->dev, "%s: read error\n", __FUNCTION__);
> + if ((i2c_transfer(client->adapter, msgs, 1)) != 1) {
> + pr_debug("%s: can't read registers\n", rs5c->rtc->name);
> return -EIO;
> }
>
> - tm->tm_sec = BCD2BIN(buf[RS5C372_REG_SECS] & 0x7f);
> - tm->tm_min = BCD2BIN(buf[RS5C372_REG_MINS] & 0x7f);
> - tm->tm_hour = BCD2BIN(buf[RS5C372_REG_HOURS] & 0x3f);
> - tm->tm_wday = BCD2BIN(buf[RS5C372_REG_WDAY] & 0x07);
> - tm->tm_mday = BCD2BIN(buf[RS5C372_REG_DAY] & 0x3f);
> + dev_dbg(&client->dev,
> + "%02x %02x %02x (%02x) %02x %02x %02x (%02x), "
> + "%02x %02x %02x, %02x %02x %02x; %02x %02x\n",
> + rs5c->regs[0], rs5c->regs[1], rs5c->regs[2], rs5c->regs[3],
> + rs5c->regs[4], rs5c->regs[5], rs5c->regs[6], rs5c->regs[7],
> + rs5c->regs[8], rs5c->regs[9], rs5c->regs[10], rs5c->regs[11],
> + rs5c->regs[12], rs5c->regs[13], rs5c->regs[14], rs5c->regs[15]);
> +
> + return 0;
> +}
> +
> +static unsigned rs5c_reg2hr(struct rs5c372 *rs5c, unsigned reg)
> +{
> + unsigned hour;
> +
> + if (rs5c->time24)
> + return BCD2BIN(reg & 0x3f);
> +
> + hour = BCD2BIN(reg & 0x1f);
> + if (hour == 12)
> + hour = 0;
> + if (reg & 0x20)
> + hour += 12;
> + return hour;
> +}
> +
> +static unsigned rs5c_hr2reg(struct rs5c372 *rs5c, unsigned hour)
> +{
> + if (rs5c->time24)
> + return BIN2BCD(hour);
> +
> + if (hour > 12)
> + return 0x20 | BIN2BCD(hour - 12);
> + if (hour == 12)
> + return 0x20 | BIN2BCD(12);
> + if (hour == 0)
> + return BIN2BCD(12);
> + return BIN2BCD(hour);
> +}
> +
> +static int rs5c372_get_datetime(struct i2c_client *client, struct
> rtc_time *tm)
> +{
> + struct rs5c372 *rs5c = i2c_get_clientdata(client);
> + int status = rs5c_get_regs(rs5c);
> +
> + if (status < 0)
> + return status;
> +
> + tm->tm_sec = BCD2BIN(rs5c->regs[RS5C372_REG_SECS] & 0x7f);
> + tm->tm_min = BCD2BIN(rs5c->regs[RS5C372_REG_MINS] & 0x7f);
> + tm->tm_hour = rs5c_reg2hr(rs5c, rs5c->regs[RS5C372_REG_HOURS]);
> +
> + tm->tm_wday = BCD2BIN(rs5c->regs[RS5C372_REG_WDAY] & 0x07);
> + tm->tm_mday = BCD2BIN(rs5c->regs[RS5C372_REG_DAY] & 0x3f);
>
> /* tm->tm_mon is zero-based */
> - tm->tm_mon = BCD2BIN(buf[RS5C372_REG_MONTH] & 0x1f) - 1;
> + tm->tm_mon = BCD2BIN(rs5c->regs[RS5C372_REG_MONTH] & 0x1f) - 1;
>
> /* year is 1900 + tm->tm_year */
> - tm->tm_year = BCD2BIN(buf[RS5C372_REG_YEAR]) + 100;
> + tm->tm_year = BCD2BIN(rs5c->regs[RS5C372_REG_YEAR]) + 100;
>
> dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
> "mday=%d, mon=%d, year=%d, wday=%d\n",
> @@ -89,22 +179,25 @@ static int rs5c372_get_datetime(struct i
> tm->tm_sec, tm->tm_min, tm->tm_hour,
> tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
>
> - return 0;
> + /* rtc might need initialization */
> + return rtc_valid_tm(tm);
> }
>
> static int rs5c372_set_datetime(struct i2c_client *client, struct
> rtc_time *tm)
> {
> - unsigned char buf[8] = { RS5C372_REG_BASE };
> + struct rs5c372 *rs5c = i2c_get_clientdata(client);
> + unsigned char buf[8];
>
> - dev_dbg(&client->dev,
> - "%s: secs=%d, mins=%d, hours=%d "
> + dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d "
> "mday=%d, mon=%d, year=%d, wday=%d\n",
> - __FUNCTION__, tm->tm_sec, tm->tm_min, tm->tm_hour,
> + __FUNCTION__,
> + tm->tm_sec, tm->tm_min, tm->tm_hour,
> tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
>
> + buf[0] = RS5C_ADDR(RS5C372_REG_SECS);
> buf[1] = BIN2BCD(tm->tm_sec);
> buf[2] = BIN2BCD(tm->tm_min);
> - buf[3] = BIN2BCD(tm->tm_hour);
> + buf[3] = rs5c_hr2reg(rs5c, tm->tm_hour);
> buf[4] = BIN2BCD(tm->tm_wday);
> buf[5] = BIN2BCD(tm->tm_mday);
> buf[6] = BIN2BCD(tm->tm_mon + 1);
> @@ -118,21 +211,43 @@ static int rs5c372_set_datetime(struct i
> return 0;
> }
>
> +#if defined(CONFIG_RTC_INTF_PROC) || defined(CONFIG_RTC_INTF_PROC_MODULE)
> +#define NEED_TRIM
> +#endif
> +
> +#if defined(CONFIG_RTC_INTF_SYSFS) ||
> defined(CONFIG_RTC_INTF_SYSFS_MODULE)
> +#define NEED_TRIM
> +#endif
> +
> +#ifdef NEED_TRIM
> static int rs5c372_get_trim(struct i2c_client *client, int *osc, int
> *trim)
> {
> struct rs5c372 *rs5c372 = i2c_get_clientdata(client);
> - u8 tmp = rs5c372->regs[RS5C372_REG_TRIM + 1];
> + u8 tmp = rs5c372->regs[RS5C372_REG_TRIM];
>
> if (osc)
> *osc = (tmp & RS5C372_TRIM_XSL) ? 32000 : 32768;
>
> if (trim) {
> - *trim = tmp & RS5C372_TRIM_MASK;
> - dev_dbg(&client->dev, "%s: raw trim=%x\n", __FUNCTION__, *trim);
> + dev_dbg(&client->dev, "%s: raw trim=%x\n", __FUNCTION__, tmp);
> + tmp &= RS5C372_TRIM_MASK;
> + if (tmp & 0x3e) {
> + int t = tmp & 0x3f;
> +
> + if (tmp & 0x40)
> + t = (~t | (s8)0xc0) + 1;
> + else
> + t = t - 1;
> +
> + tmp = t * 2;
> + } else
> + tmp = 0;
> + *trim = tmp;
> }
>
> return 0;
> }
> +#endif
>
> static int rs5c372_rtc_read_time(struct device *dev, struct rtc_time *tm)
> {
> @@ -144,25 +259,190 @@ static int rs5c372_rtc_set_time(struct d
> return rs5c372_set_datetime(to_i2c_client(dev), tm);
> }
>
> +#if defined(CONFIG_RTC_INTF_DEV) || defined(CONFIG_RTC_INTF_DEV_MODULE)
> +
> +static int
> +rs5c_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
> +{
> + struct i2c_client *client = to_i2c_client(dev);
> + struct rs5c372 *rs5c = i2c_get_clientdata(client);
> + unsigned char buf[2];
> + int status;
> +
> + buf[1] = rs5c->regs[RS5C_REG_CTRL1];
> + switch (cmd) {
> + case RTC_UIE_OFF:
> + case RTC_UIE_ON:
> + /* some 327a modes use a different IRQ pin for 1Hz irqs */
> + if (rs5c->type == rtc_rs5c372a
> + && (buf[1] & RS5C372A_CTRL1_SL1))
> + return -ENOIOCTLCMD;
> + case RTC_AIE_OFF:
> + case RTC_AIE_ON:
> + /* these irq management calls only make sense for chips
> + * which are wired up to an IRQ.
> + */
> + if (!rs5c->has_irq)
> + return -ENOIOCTLCMD;
> + break;
> + default:
> + return -ENOIOCTLCMD;
> + }
> +
> + status = rs5c_get_regs(rs5c);
> + if (status < 0)
> + return status;
> +
> + buf[0] = RS5C_ADDR(RS5C_REG_CTRL1);
> + switch (cmd) {
> + case RTC_AIE_OFF: /* alarm off */
> + buf[1] &= ~RS5C_CTRL1_AALE;
> + break;
> + case RTC_AIE_ON: /* alarm on */
> + buf[1] |= RS5C_CTRL1_AALE;
> + break;
> + case RTC_UIE_OFF: /* update off */
> + buf[1] &= ~RS5C_CTRL1_CT_MASK;
> + break;
> + case RTC_UIE_ON: /* update on */
> + buf[1] &= ~RS5C_CTRL1_CT_MASK;
> + buf[1] |= RS5C_CTRL1_CT4;
> + break;
> + }
> + if ((i2c_master_send(client, buf, 2)) != 2) {
> + printk(KERN_WARNING "%s: can't update alarm\n",
> + rs5c->rtc->name);
> + status = -EIO;
> + } else
> + rs5c->regs[RS5C_REG_CTRL1] = buf[1];
> + return status;
> +}
> +
> +#else
> +#define rs5c_rtc_ioctl NULL
> +#endif
> +
> +
> +/* NOTE: Since RTC_WKALM_{RD,SET} were originally defined for EFI,
> + * which only exposes a polled programming interface; and since
> + * these calls map directly to those EFI requests; we don't demand
> + * we have an IRQ for this chip when we go through this API.
> + *
> + * The older x86_pc derived RTC_ALM_{READ,SET} calls require irqs
> + * though, managed through RTC_AIE_{ON,OFF} requests.
> + */
> +
> +static int rs5c_read_alarm(struct device *dev, struct rtc_wkalrm *t)
> +{
> + struct i2c_client *client = to_i2c_client(dev);
> + struct rs5c372 *rs5c = i2c_get_clientdata(client);
> + int status;
> +
> + status = rs5c_get_regs(rs5c);
> + if (status < 0)
> + return status;
> +
> + /* report alarm time */
> + t->time.tm_sec = 0;
> + t->time.tm_min = BCD2BIN(rs5c->regs[RS5C_REG_ALARM_A_MIN] & 0x7f);
> + t->time.tm_hour = rs5c_reg2hr(rs5c, rs5c->regs[RS5C_REG_ALARM_A_HOURS]);
> + t->time.tm_mday = -1;
> + t->time.tm_mon = -1;
> + t->time.tm_year = -1;
> + t->time.tm_wday = -1;
> + t->time.tm_yday = -1;
> + t->time.tm_isdst = -1;
> +
> + /* ... and status */
> + t->enabled = !!(rs5c->regs[RS5C_REG_CTRL1] & RS5C_CTRL1_AALE);
> + t->pending = !!(rs5c->regs[RS5C_REG_CTRL2] & RS5C_CTRL2_AAFG);
> +
> + return 0;
> +}
> +
> +static int rs5c_set_alarm(struct device *dev, struct rtc_wkalrm *t)
> +{
> + struct i2c_client *client = to_i2c_client(dev);
> + struct rs5c372 *rs5c = i2c_get_clientdata(client);
> + int status;
> + unsigned char buf[4];
> +
> + /* only handle up to 24 hours in the future, like RTC_ALM_SET */
> + if (t->time.tm_mday != -1
> + || t->time.tm_mon != -1
> + || t->time.tm_year != -1)
> + return -EINVAL;
> +
> + /* REVISIT: round up tm_sec */
> +
> + /* if needed, disable irq (clears pending status) */
> + status = rs5c_get_regs(rs5c);
> + if (status < 0)
> + return status;
> + if (rs5c->regs[RS5C_REG_CTRL1] & RS5C_CTRL1_AALE) {
> + buf[0] = RS5C_ADDR(RS5C_REG_CTRL1);
> + buf[1] = rs5c->regs[RS5C_REG_CTRL1] & ~RS5C_CTRL1_AALE;
> + if (i2c_master_send(client, buf, 2) != 2) {
> + pr_debug("%s: can't disable alarm\n", rs5c->rtc->name);
> + return -EIO;
> + }
> + rs5c->regs[RS5C_REG_CTRL1] = buf[1];
> + }
> +
> + /* set alarm */
> + buf[0] = RS5C_ADDR(RS5C_REG_ALARM_A_MIN);
> + buf[1] = BIN2BCD(t->time.tm_min);
> + buf[2] = rs5c_hr2reg(rs5c, t->time.tm_hour);
> + buf[3] = 0x7f; /* any/all days */
> + if ((i2c_master_send(client, buf, 4)) != 4) {
> + pr_debug("%s: can't set alarm time\n", rs5c->rtc->name);
> + return -EIO;
> + }
> +
> + /* ... and maybe enable its irq */
> + if (t->enabled) {
> + buf[0] = RS5C_ADDR(RS5C_REG_CTRL1);
> + buf[1] = rs5c->regs[RS5C_REG_CTRL1] | RS5C_CTRL1_AALE;
> + if ((i2c_master_send(client, buf, 2)) != 2)
> + printk(KERN_WARNING "%s: can't enable alarm\n",
> + rs5c->rtc->name);
> + rs5c->regs[RS5C_REG_CTRL1] = buf[1];
> + }
> +
> + return 0;
> +}
> +
> +#if defined(CONFIG_RTC_INTF_PROC) || defined(CONFIG_RTC_INTF_PROC_MODULE)
> +
> static int rs5c372_rtc_proc(struct device *dev, struct seq_file *seq)
> {
> int err, osc, trim;
>
> err = rs5c372_get_trim(to_i2c_client(dev), &osc, &trim);
> if (err == 0) {
> - seq_printf(seq, "%d.%03d KHz\n", osc / 1000, osc % 1000);
> - seq_printf(seq, "trim\t: %d\n", trim);
> + seq_printf(seq, "crystal\t\t: %d.%03d KHz\n",
> + osc / 1000, osc % 1000);
> + seq_printf(seq, "trim\t\t: %d\n", trim);
> }
>
> return 0;
> }
>
> +#else
> +#define rs5c372_rtc_proc NULL
> +#endif
> +
> static const struct rtc_class_ops rs5c372_rtc_ops = {
> .proc = rs5c372_rtc_proc,
> + .ioctl = rs5c_rtc_ioctl,
> .read_time = rs5c372_rtc_read_time,
> .set_time = rs5c372_rtc_set_time,
> + .read_alarm = rs5c_read_alarm,
> + .set_alarm = rs5c_set_alarm,
> };
>
> +#if defined(CONFIG_RTC_INTF_SYSFS) ||
> defined(CONFIG_RTC_INTF_SYSFS_MODULE)
> +
> static ssize_t rs5c372_sysfs_show_trim(struct device *dev,
> struct device_attribute *attr, char *buf)
> {
> @@ -172,7 +452,7 @@ static ssize_t rs5c372_sysfs_show_trim(s
> if (err)
> return err;
>
> - return sprintf(buf, "0x%2x\n", trim);
> + return sprintf(buf, "%d\n", trim);
> }
> static DEVICE_ATTR(trim, S_IRUGO, rs5c372_sysfs_show_trim, NULL);
>
> @@ -189,16 +469,35 @@ static ssize_t rs5c372_sysfs_show_osc(st
> }
> static DEVICE_ATTR(osc, S_IRUGO, rs5c372_sysfs_show_osc, NULL);
>
> -static int rs5c372_attach(struct i2c_adapter *adapter)
> +static int rs5c_sysfs_register(struct device *dev)
> {
> - return i2c_probe(adapter, &addr_data, rs5c372_probe);
> + 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;
> +}
> +
> +#else
> +static int rs5c_sysfs_register(struct device *dev)
> +{
> + return 0;
> }
> +#endif /* SYSFS */
> +
> +static struct i2c_driver rs5c372_driver;
>
> static int rs5c372_probe(struct i2c_adapter *adapter, int address, int
> kind)
> {
> int err = 0;
> struct i2c_client *client;
> struct rs5c372 *rs5c372;
> + struct rtc_time tm;
>
> dev_dbg(adapter->class_dev.dev, "%s\n", __FUNCTION__);
>
> @@ -211,7 +510,15 @@ static int rs5c372_probe(struct i2c_adap
> err = -ENOMEM;
> goto exit;
> }
> - client = &rs5c372->client;
> +
> + /* we read registers 0x0f then 0x00-0x0f; skip the first one */
> + rs5c372->regs=&rs5c372->buf[1];
> +
> + /* On conversion to a "new style" i2c driver, we'll be handed
> + * the i2c_client (we won't create it)
> + */
> + client = &rs5c372->dev;
> + rs5c372->client = client;
>
> /* I2C client */
> client->addr = address;
> @@ -222,16 +529,99 @@ static int rs5c372_probe(struct i2c_adap
>
> i2c_set_clientdata(client, rs5c372);
>
> - rs5c372->msg[0].addr = address;
> - rs5c372->msg[0].flags = I2C_M_RD;
> - rs5c372->msg[0].len = sizeof(rs5c372->regs);
> - rs5c372->msg[0].buf = rs5c372->regs;
> -
> /* Inform the i2c layer */
> if ((err = i2c_attach_client(client)))
> goto exit_kfree;
>
> - dev_info(&client->dev, "chip found, driver version " DRV_VERSION "\n");
> + err = rs5c_get_regs(rs5c372);
> + if (err < 0)
> + goto exit_detach;
> +
> + /* For "new style" drivers, irq is in i2c_client and chip type
> + * info comes from i2c_client.dev.platform_data. Meanwhile:
> + *
> + * STICK BOARD-SPECIFIC SETUP CODE RIGHT HERE
> + */
> + if (rs5c372->type == rtc_undef) {
> + rs5c372->type = rtc_rs5c372b;
> + dev_warn(&client->dev, "assuming rs5c372b\n");
> + }
> +
> + /* 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_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_detach;
> + }
> +
> + /* if the oscillator lost power and no other software (like
> + * the bootloader) set it up, do it here.
> + */
> + if (rs5c372->regs[RS5C_REG_CTRL2] & RS5C_CTRL2_XSTP) {
> + unsigned char buf[3];
> +
> + rs5c372->regs[RS5C_REG_CTRL2] &= ~RS5C_CTRL2_XSTP;
> +
> + buf[0] = RS5C_ADDR(RS5C_REG_CTRL1);
> + buf[1] = rs5c372->regs[RS5C_REG_CTRL1];
> + buf[2] = rs5c372->regs[RS5C_REG_CTRL2];
> +
> + /* use 24hr mode */
> + switch (rs5c372->type) {
> + case rtc_rs5c372a:
> + case rtc_rs5c372b:
> + buf[2] |= RS5C372_CTRL2_24;
> + rs5c372->time24 = 1;
> + break;
> + case rtc_rv5c386:
> + case rtc_rv5c387a:
> + buf[1] |= RV5C387_CTRL1_24;
> + rs5c372->time24 = 1;
> + break;
> + default:
> + /* impossible */
> + break;
> + }
> +
> + if ((i2c_master_send(client, buf, 3)) != 3) {
> + dev_err(&client->dev, "setup error\n");
> + goto exit_detach;
> + }
> + rs5c372->regs[RS5C_REG_CTRL1] = buf[1];
> + rs5c372->regs[RS5C_REG_CTRL2] = buf[2];
> + }
> +
> + if (rs5c372_get_datetime(client, &tm) < 0)
> + dev_warn(&client->dev, "clock needs to be set\n");
> +
> + dev_info(&client->dev, "%s found, %s, driver version " DRV_VERSION "\n",
> + ({ char *s; switch (rs5c372->type) {
> + 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"
> + );
> +
> + /* FIXME when client->irq exists, use it to register alarm irq */
>
> rs5c372->rtc = rtc_device_register(rs5c372_driver.driver.name,
> &client->dev, &rs5c372_rtc_ops, THIS_MODULE);
> @@ -241,18 +631,12 @@ static int rs5c372_probe(struct i2c_adap
> goto exit_detach;
> }
>
> - err = device_create_file(&client->dev, &dev_attr_trim);
> + err = rs5c_sysfs_register(&client->dev);
> if (err)
> goto exit_devreg;
> - err = device_create_file(&client->dev, &dev_attr_osc);
> - if (err)
> - goto exit_trim;
>
> return 0;
>
> -exit_trim:
> - device_remove_file(&client->dev, &dev_attr_trim);
> -
> exit_devreg:
> rtc_device_unregister(rs5c372->rtc);
>
> @@ -266,6 +650,11 @@ exit:
> return err;
> }
>
> +static int rs5c372_attach(struct i2c_adapter *adapter)
> +{
> + return i2c_probe(adapter, &addr_data, rs5c372_probe);
> +}
> +
> static int rs5c372_detach(struct i2c_client *client)
> {
> int err;
> @@ -274,6 +663,8 @@ static int rs5c372_detach(struct i2c_cli
> if (rs5c372->rtc)
> rtc_device_unregister(rs5c372->rtc);
>
> + /* REVISIT properly destroy the sysfs files ... */
> +
> if ((err = i2c_detach_client(client)))
> return err;
>
> @@ -281,6 +672,14 @@ static int rs5c372_detach(struct i2c_cli
> return 0;
> }
>
> +static struct i2c_driver rs5c372_driver = {
> + .driver = {
> + .name = "rtc-rs5c372",
> + },
> + .attach_adapter = &rs5c372_attach,
> + .detach_client = &rs5c372_detach,
> +};
> +
> static __init int rs5c372_init(void)
> {
> return i2c_add_driver(&rs5c372_driver);
>
-
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