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rtc-max6900 new style driver
New style conversion and reformatting as per indent --linux-style Signed-off-by: Alessandro Zummo <a.zummo@towertech.it> Cc: Dale Farnsworth <dale@farnsworth.org> Cc: David Brownell <david-b@pacbell.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alessandro Zummo
Linus Torvalds
parent
fb0d4ec4d3
commit
6fd5c03f82
@ -17,19 +17,18 @@
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#include <linux/rtc.h>
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#include <linux/delay.h>
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#define DRV_NAME "max6900"
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#define DRV_VERSION "0.1"
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#define DRV_VERSION "0.2"
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/*
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* register indices
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*/
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#define MAX6900_REG_SC 0 /* seconds 00-59 */
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#define MAX6900_REG_MN 1 /* minutes 00-59 */
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#define MAX6900_REG_HR 2 /* hours 00-23 */
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#define MAX6900_REG_DT 3 /* day of month 00-31 */
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#define MAX6900_REG_MO 4 /* month 01-12 */
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#define MAX6900_REG_DW 5 /* day of week 1-7 */
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#define MAX6900_REG_YR 6 /* year 00-99 */
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#define MAX6900_REG_SC 0 /* seconds 00-59 */
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#define MAX6900_REG_MN 1 /* minutes 00-59 */
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#define MAX6900_REG_HR 2 /* hours 00-23 */
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#define MAX6900_REG_DT 3 /* day of month 00-31 */
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#define MAX6900_REG_MO 4 /* month 01-12 */
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#define MAX6900_REG_DW 5 /* day of week 1-7 */
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#define MAX6900_REG_YR 6 /* year 00-99 */
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#define MAX6900_REG_CT 7 /* control */
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/* register 8 is undocumented */
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#define MAX6900_REG_CENTURY 9 /* century */
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@ -39,7 +38,6 @@
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#define MAX6900_REG_CT_WP (1 << 7) /* Write Protect */
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/*
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* register read/write commands
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*/
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@ -52,16 +50,7 @@
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#define MAX6900_IDLE_TIME_AFTER_WRITE 3 /* specification says 2.5 mS */
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#define MAX6900_I2C_ADDR 0xa0
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static const unsigned short normal_i2c[] = {
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MAX6900_I2C_ADDR >> 1,
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I2C_CLIENT_END
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};
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I2C_CLIENT_INSMOD; /* defines addr_data */
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static int max6900_probe(struct i2c_adapter *adapter, int addr, int kind);
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static struct i2c_driver max6900_driver;
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static int max6900_i2c_read_regs(struct i2c_client *client, u8 *buf)
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{
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@ -69,36 +58,35 @@ static int max6900_i2c_read_regs(struct i2c_client *client, u8 *buf)
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u8 reg_century_read[1] = { MAX6900_REG_CENTURY_READ };
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struct i2c_msg msgs[4] = {
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{
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.addr = client->addr,
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.flags = 0, /* write */
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.len = sizeof(reg_burst_read),
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.buf = reg_burst_read
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},
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.addr = client->addr,
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.flags = 0, /* write */
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.len = sizeof(reg_burst_read),
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.buf = reg_burst_read}
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,
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{
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.addr = client->addr,
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.flags = I2C_M_RD,
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.len = MAX6900_BURST_LEN,
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.buf = buf
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},
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.addr = client->addr,
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.flags = I2C_M_RD,
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.len = MAX6900_BURST_LEN,
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.buf = buf}
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,
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{
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.addr = client->addr,
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.flags = 0, /* write */
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.len = sizeof(reg_century_read),
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.buf = reg_century_read
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},
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.addr = client->addr,
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.flags = 0, /* write */
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.len = sizeof(reg_century_read),
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.buf = reg_century_read}
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,
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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(buf[MAX6900_REG_CENTURY]),
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.buf = &buf[MAX6900_REG_CENTURY]
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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(buf[MAX6900_REG_CENTURY]),
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.buf = &buf[MAX6900_REG_CENTURY]
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}
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};
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int rc;
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rc = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
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if (rc != ARRAY_SIZE(msgs)) {
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dev_err(&client->dev, "%s: register read failed\n",
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__func__);
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dev_err(&client->dev, "%s: register read failed\n", __func__);
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return -EIO;
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}
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return 0;
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@ -109,20 +97,18 @@ static int max6900_i2c_write_regs(struct i2c_client *client, u8 const *buf)
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u8 i2c_century_buf[1 + 1] = { MAX6900_REG_CENTURY_WRITE };
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struct i2c_msg century_msgs[1] = {
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{
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.addr = client->addr,
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.flags = 0, /* write */
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.len = sizeof(i2c_century_buf),
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.buf = i2c_century_buf
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}
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.addr = client->addr,
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.flags = 0, /* write */
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.len = sizeof(i2c_century_buf),
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.buf = i2c_century_buf}
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};
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u8 i2c_burst_buf[MAX6900_BURST_LEN + 1] = { MAX6900_REG_BURST_WRITE };
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struct i2c_msg burst_msgs[1] = {
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{
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.addr = client->addr,
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.flags = 0, /* write */
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.len = sizeof(i2c_burst_buf),
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.buf = i2c_burst_buf
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}
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.addr = client->addr,
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.flags = 0, /* write */
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.len = sizeof(i2c_burst_buf),
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.buf = i2c_burst_buf}
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};
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int rc;
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@ -133,10 +119,12 @@ static int max6900_i2c_write_regs(struct i2c_client *client, u8 const *buf)
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* bit as part of the burst write.
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*/
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i2c_century_buf[1] = buf[MAX6900_REG_CENTURY];
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rc = i2c_transfer(client->adapter, century_msgs,
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ARRAY_SIZE(century_msgs));
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if (rc != ARRAY_SIZE(century_msgs))
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goto write_failed;
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msleep(MAX6900_IDLE_TIME_AFTER_WRITE);
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memcpy(&i2c_burst_buf[1], buf, MAX6900_BURST_LEN);
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@ -148,45 +136,11 @@ static int max6900_i2c_write_regs(struct i2c_client *client, u8 const *buf)
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return 0;
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write_failed:
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dev_err(&client->dev, "%s: register write failed\n",
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__func__);
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write_failed:
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dev_err(&client->dev, "%s: register write failed\n", __func__);
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return -EIO;
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}
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static int max6900_i2c_validate_client(struct i2c_client *client)
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{
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u8 regs[MAX6900_REG_LEN];
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u8 zero_mask[] = {
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0x80, /* seconds */
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0x80, /* minutes */
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0x40, /* hours */
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0xc0, /* day of month */
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0xe0, /* month */
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0xf8, /* day of week */
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0x00, /* year */
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0x7f, /* control */
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};
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int i;
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int rc;
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int reserved;
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reserved = i2c_smbus_read_byte_data(client, MAX6900_REG_RESERVED_READ);
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if (reserved != 0x07)
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return -ENODEV;
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rc = max6900_i2c_read_regs(client, regs);
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if (rc < 0)
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return rc;
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for (i = 0; i < ARRAY_SIZE(zero_mask); ++i) {
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if (regs[i] & zero_mask[i])
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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 max6900_i2c_read_time(struct i2c_client *client, struct rtc_time *tm)
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{
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int rc;
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@ -202,7 +156,7 @@ static int max6900_i2c_read_time(struct i2c_client *client, struct rtc_time *tm)
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tm->tm_mday = BCD2BIN(regs[MAX6900_REG_DT]);
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tm->tm_mon = BCD2BIN(regs[MAX6900_REG_MO]) - 1;
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tm->tm_year = BCD2BIN(regs[MAX6900_REG_YR]) +
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BCD2BIN(regs[MAX6900_REG_CENTURY]) * 100 - 1900;
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BCD2BIN(regs[MAX6900_REG_CENTURY]) * 100 - 1900;
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tm->tm_wday = BCD2BIN(regs[MAX6900_REG_DW]);
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return 0;
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@ -211,7 +165,7 @@ static int max6900_i2c_read_time(struct i2c_client *client, struct rtc_time *tm)
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static int max6900_i2c_clear_write_protect(struct i2c_client *client)
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{
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int rc;
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rc = i2c_smbus_write_byte_data (client, MAX6900_REG_CONTROL_WRITE, 0);
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rc = i2c_smbus_write_byte_data(client, MAX6900_REG_CONTROL_WRITE, 0);
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if (rc < 0) {
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dev_err(&client->dev, "%s: control register write failed\n",
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__func__);
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@ -220,8 +174,8 @@ static int max6900_i2c_clear_write_protect(struct i2c_client *client)
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return 0;
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}
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static int max6900_i2c_set_time(struct i2c_client *client,
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struct rtc_time const *tm)
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static int
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max6900_i2c_set_time(struct i2c_client *client, struct rtc_time const *tm)
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{
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u8 regs[MAX6900_REG_LEN];
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int rc;
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@ -258,89 +212,49 @@ static int max6900_rtc_set_time(struct device *dev, struct rtc_time *tm)
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return max6900_i2c_set_time(to_i2c_client(dev), tm);
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}
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static int max6900_attach_adapter(struct i2c_adapter *adapter)
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static int max6900_remove(struct i2c_client *client)
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{
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return i2c_probe(adapter, &addr_data, max6900_probe);
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}
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static int max6900_detach_client(struct i2c_client *client)
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{
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struct rtc_device *const rtc = i2c_get_clientdata(client);
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struct rtc_device *rtc = i2c_get_clientdata(client);
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if (rtc)
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rtc_device_unregister(rtc);
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return i2c_detach_client(client);
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return 0;
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}
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static struct i2c_driver max6900_driver = {
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.driver = {
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.name = DRV_NAME,
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},
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.id = I2C_DRIVERID_MAX6900,
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.attach_adapter = max6900_attach_adapter,
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.detach_client = max6900_detach_client,
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};
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static const struct rtc_class_ops max6900_rtc_ops = {
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.read_time = max6900_rtc_read_time,
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.set_time = max6900_rtc_set_time,
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.read_time = max6900_rtc_read_time,
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.set_time = max6900_rtc_set_time,
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};
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static int max6900_probe(struct i2c_adapter *adapter, int addr, int kind)
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static int
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max6900_probe(struct i2c_client *client, const struct i2c_device_id *id)
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{
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int rc = 0;
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struct i2c_client *client = NULL;
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struct rtc_device *rtc = NULL;
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struct rtc_device *rtc;
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if (!i2c_check_functionality(adapter, I2C_FUNC_I2C)) {
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rc = -ENODEV;
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goto failout;
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}
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
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return -ENODEV;
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client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
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if (client == NULL) {
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rc = -ENOMEM;
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goto failout;
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}
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client->addr = addr;
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client->adapter = adapter;
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client->driver = &max6900_driver;
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strlcpy(client->name, DRV_NAME, I2C_NAME_SIZE);
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if (kind < 0) {
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rc = max6900_i2c_validate_client(client);
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if (rc < 0)
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goto failout;
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}
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rc = i2c_attach_client(client);
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if (rc < 0)
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goto failout;
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dev_info(&client->dev,
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"chip found, driver version " DRV_VERSION "\n");
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dev_info(&client->dev, "chip found, driver version " DRV_VERSION "\n");
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rtc = rtc_device_register(max6900_driver.driver.name,
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&client->dev,
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&max6900_rtc_ops, THIS_MODULE);
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if (IS_ERR(rtc)) {
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rc = PTR_ERR(rtc);
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goto failout_detach;
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}
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&client->dev, &max6900_rtc_ops, THIS_MODULE);
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if (IS_ERR(rtc))
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return PTR_ERR(rtc);
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i2c_set_clientdata(client, rtc);
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return 0;
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failout_detach:
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i2c_detach_client(client);
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failout:
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kfree(client);
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return rc;
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}
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static struct i2c_driver max6900_driver = {
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.driver = {
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.name = "rtc-max6900",
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},
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.probe = max6900_probe,
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.remove = max6900_remove,
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};
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static int __init max6900_init(void)
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{
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return i2c_add_driver(&max6900_driver);
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@ -352,6 +266,7 @@ static void __exit max6900_exit(void)
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}
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MODULE_DESCRIPTION("Maxim MAX6900 RTC driver");
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MODULE_AUTHOR("Dale Farnsworth <dale@farnsworth.org>");
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MODULE_LICENSE("GPL");
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MODULE_VERSION(DRV_VERSION);
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