diff options
| author | Qiao Zhou <zhouqiao@marvell.com> | 2012-07-09 10:37:33 +0400 |
|---|---|---|
| committer | Samuel Ortiz <sameo@linux.intel.com> | 2012-07-09 17:13:31 +0400 |
| commit | 5500e3964b8c154dc5af51ebcd7cd4df5d4abfee (patch) | |
| tree | 729e2fb0ecd6b84b445722637cb511edbcc9df0b /drivers/mfd | |
| parent | 70c6cce040661204986ebbf22224cb24bd77ea71 (diff) | |
| download | linux-5500e3964b8c154dc5af51ebcd7cd4df5d4abfee.tar.xz | |
mfd: Add companion chip in 88pm80x
in hw design, 800 is mainly for pmic control, while 805 for audio.
but there are 3 registers which controls class D speaker property,
and they are defined in 800 i2c client domain. so 805 codec driver
needs to use 800 i2c client to access class D speaker reg for
audio path management. so add this workaround for the purpose to
let 805 access 800 i2c in some scenario.
Signed-off-by: Qiao Zhou <zhouqiao@marvell.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Diffstat (limited to 'drivers/mfd')
| -rw-r--r-- | drivers/mfd/88pm80x.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/drivers/mfd/88pm80x.c b/drivers/mfd/88pm80x.c index 90aa18a37f79..77b865594c29 100644 --- a/drivers/mfd/88pm80x.c +++ b/drivers/mfd/88pm80x.c @@ -18,6 +18,12 @@ #include <linux/uaccess.h> #include <linux/err.h> +/* + * workaround: some registers needed by pm805 are defined in pm800, so + * need to use this global variable to maintain the relation between + * pm800 and pm805. would remove it after HW chip fixes the issue. + */ +static struct pm80x_chip *g_pm80x_chip; const struct regmap_config pm80x_regmap_config = { .reg_bits = 8, @@ -61,6 +67,19 @@ int __devinit pm80x_init(struct i2c_client *client, device_init_wakeup(&client->dev, 1); + /* + * workaround: set g_pm80x_chip to the first probed chip. if the + * second chip is probed, just point to the companion to each + * other so that pm805 can access those specific register. would + * remove it after HW chip fixes the issue. + */ + if (!g_pm80x_chip) + g_pm80x_chip = chip; + else { + chip->companion = g_pm80x_chip->client; + g_pm80x_chip->companion = chip->client; + } + return 0; err_chip_id: @@ -75,6 +94,15 @@ int __devexit pm80x_deinit(struct i2c_client *client) { struct pm80x_chip *chip = i2c_get_clientdata(client); + /* + * workaround: clear the dependency between pm800 and pm805. + * would remove it after HW chip fixes the issue. + */ + if (g_pm80x_chip->companion) + g_pm80x_chip->companion = NULL; + else + g_pm80x_chip = NULL; + regmap_exit(chip->regmap); devm_kfree(&client->dev, chip); |