diff options
| author | Bitan Biswas <bbiswas@nvidia.com> | 2011-06-10 13:09:00 +0530 |
|---|---|---|
| committer | Dan Willemsen <dwillemsen@nvidia.com> | 2011-11-30 21:47:25 -0800 |
| commit | 82323cafdf23cf57cab48f18083e0d4e1bef3ed0 (patch) | |
| tree | 6a42a3d846186337ea583d266c33dd5c3b685534 /arch/arm/mach-tegra/tegra3_tsensor.c | |
| parent | 3a515d19515bed05ed720e8b34a86f9be04a766f (diff) | |
arm: tegra: tsensor: driver instantiation
Tegra internal tsensor driver supported for fuse revision 0.8
and above.
Bug 661228
Original-Change-Id: I820f6b5f20c20bb2d1ba04266148f5969ab84444
Reviewed-on: http://git-master/r/36054
Reviewed-by: Varun Colbert <vcolbert@nvidia.com>
Tested-by: Varun Colbert <vcolbert@nvidia.com>
Rebase-Id: R4725524b5e3f83b4cd3dd7d0020ef2d6e09a87d0
Diffstat (limited to 'arch/arm/mach-tegra/tegra3_tsensor.c')
| -rw-r--r-- | arch/arm/mach-tegra/tegra3_tsensor.c | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/arch/arm/mach-tegra/tegra3_tsensor.c b/arch/arm/mach-tegra/tegra3_tsensor.c new file mode 100644 index 000000000000..cbf5c5ab2522 --- /dev/null +++ b/arch/arm/mach-tegra/tegra3_tsensor.c @@ -0,0 +1,57 @@ +/* + * arch/arm/mach-tegra/tegra3_tsensor.c + * + * Copyright (C) 2011 NVIDIA Corporation. + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ + +#include <linux/kernel.h> +#include <linux/init.h> +#include "board.h" + +#ifdef CONFIG_SENSORS_TEGRA_TSENSOR +#include <mach/tsensor.h> +#include "devices.h" +#include "fuse.h" + +static struct tegra_tsensor_platform_data tsensor_data = { + .hysteresis = 5, + .sw_intr_temperature = 75, + .hw_clk_div_temperature = 80, + .hw_reset_temperature = 90, +}; + +/* fuse revision constants used for tsensor */ +#define FUSE_TEST_PROGRAM_REVISION_0 0x128 +#define TSENSOR_FUSE_REVISION_DECIMAL 8 +#define TSENSOR_FUSE_REVISION_INTEGER 0 + +void __init tegra_tsensor_init(void) +{ + unsigned int reg, fuse_rev_integer, fuse_rev_decimal; + /* tsensor driver is instantiated based on fuse revision */ + reg = tegra_fuse_readl(FUSE_TEST_PROGRAM_REVISION_0); + fuse_rev_decimal = (reg & 0xf); + fuse_rev_integer = ((reg >> 4) & 0x7); + pr_info("\nTegra3 fuse revision %d.%d \n", fuse_rev_integer, + fuse_rev_decimal); + if ((fuse_rev_decimal >= TSENSOR_FUSE_REVISION_DECIMAL) && + (fuse_rev_integer >= TSENSOR_FUSE_REVISION_INTEGER)) { + /* set platform data for device before register */ + tegra_tsensor_device.dev.platform_data = &tsensor_data; + platform_device_register(&tegra_tsensor_device); + } +} +#else +void __init tegra_tsensor_init(void) { } +#endif + |