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![Greg Kroah-Hartman](/assets/img/avatar_default.png)
Particularly great to see a resolver driver move out of staging via a massive set of changes. Only took 13 years :) One small patch added then reverted due to a report of test breakage (ashai-kasei,ak8975: Drop deprecated enums.) An immutable branch was used for some hid-senors changes in case there was a need to take them into the HID tree as well. New device support ----------------- adi,hmc425a - Add support for HMC540SLP3E broadband 4-bit digital attenuator. kionix,kx022a - Add support for the kx132-1211 accelerometer. Require significant driver rework to enable this including add a chip type specific structure to deal with the chip differences. - Add support for the kx132acr-lbz accelerometer (subset of the kx022a feature set). lltc,ltc2309 - New driver for this 8 channel ADC. microchip,mcp3911 - Add support for rest of mcp391x family of ADCs (there are various differences beyond simple channel count variation. Series includes some general driver cleanup. microchip,mcp3564 - New driver for MCP3461, MCP3462, MCP3464, MCP3541, MCP3562, MCP3564 and their R variants of 16/24bit ADCs. A few minor fixed followed. rohm,bu1390 - New driver for this pressure sensor. Staging graduation ------------------ adi,ad1210 (after 13 or so years :) - More or less a complete (step-wise) rewrite of this resolver driver to bring it up to date with modern IIO standards. The fault signal handling mapping to event channels was particularly complex and significant part of the changes. Features -------- iio-core - Add chromacity and color temperature channel types. adi,ad7192 - Oversampling ratio control (called fast settling in datasheet). adi,adis16475 - Add core support and then driver support for delta angle and delta velocity channels. These are intended for summation to establish angle and velocity changes over larger timescales. Fix was needed for alignment after the temperature channel. Further fix reduced set of devices for which the buffer support was applicable as seems burst reads don't cover these on all devices. hid-sensors-als - Chromacity and color temperatures support including in amd sfh. stx104 - Add support for counter subsystem to this multipurpose device. ti,twl6030 - Add missing device tree binding description. Clean up and minor fixes. ------------------------ treewide - Drop some unused declarations across IIO. - Make more use of device_get_match_data() instead of OF specific approaches. Similar cleanup to sets of drivers. - Stop platform remove callbacks returning anything by using the temporary remove_new() callback. - Use i2c_get_match_data() to cope nicely with all types of ID table entry. - Use device_get_match_data() for various platform device to cope with more types of firmware. - Convert from enum to pointer in ID tables allowing use of i2c_get_match_data(). - Fix sorting on some ID tables. - Include specific string helper headers rather than simply string_helpers.h docs - Better description of the ordering requirements etc for available_scan_masks. tools - Handle alignment of mixed sizes where the last element isn't the biggest correctly. Seems that doesn't happen often! adi,ad2s1210 - Lots of work from David Lechner on this driver including a few fixes that are going with the rework to avoid slowing that down. adi,ad4310 - Replace deprecated devm_clk_register() adi,ad74413r - Bring the channel function setting inline with the datasheet. adi,ad7192 - Change to FIELD_PREP(), FIELD_GET(). - Calculate f_order from the sinc filter and chop filter states. - Move more per chip config into data in struct ad7192_chip_info - Cleanup unused parameter in channel macros. adi,adf4350 - Make use of devm_* to simplify error handling for many of the setup calls in probe() / tear down in remove() and error paths. Some more work to be done on this one. - Use dev_err_probe() for errors in probe() callback. adi,adf4413 - Typo in function name prefix. adi,adxl345 - Add channel scale to the chip type specific structure and drop using a type field previously used for indirection. asahi,ak8985 - Fix a mismatch introduced when switching from enum->pointers in the match tables. amlogic,meson - Expand error logging during probe. invensense,mpu6050 - Support level-shifter control. Whilst no one is sure exactly what this is doing it is needed for some old boards. - Document mount-matrix dt-binding. mediatek,mt6577 - Use devm_clk_get_enabled() to replace open coded version and move everything over to being device managed. Drop now empty remove() callback. Fix follows to put the drvdata back. - Use dev_err_probe() for error reporting in probe() callback. memsic,mxc4005 - Add of_match_table. microchip,mcp4725 - Move various chip specific data from being looked up by chip ID to data in the chip type specific structure. silicon-labs,si7005 - Add of_match_table and entry in trivial-devices.yaml st,lsm6dsx - Add missing mount-matrix dt binding documentation. st,spear - Use devm_clk_get_enabled() and some other devm calls to move everything over to being device managed. Drop now empty remove() callback. - Use dev_err_probe() to better handled deferred probing and tidy up error reporting in probe() callback. st,stm32-adc - Add a bit of additional checking in probe() to protect against a NULL pointer (no known path to trigger it today). - Replace deprecated strncpy() ti,ads1015 - Allow for edge triggers. - Document interrupt in dt-bindings. -----BEGIN PGP SIGNATURE----- iQJFBAABCAAvFiEEbilms4eEBlKRJoGxVIU0mcT0FogFAmUu3sURHGppYzIzQGtl cm5lbC5vcmcACgkQVIU0mcT0FohL9w/+PVaeiYsmuJfWcxjVhiGFz+HBbwSFcHFp ASXuYq9rYoea62JlvcLB3GJ43ziB80Am5qA5bWTkPHFqbAPZlgDzoGZGPMrpjfI1 iV6NwiPigRRTw2JjB0TDS8HepQomA1qA0FwXngLrSy1eQmN0/NJOp0k8m54OpCV+ FdW3dDy7UomXyVCb+OAOWNYvV20ZOK1/WK9yWCpPWZtOKMfX2cLLqiwtjm6VdXTg wtqSRVfBB/p7k3UapXiLuz4fExEancW4z2qYEaBK2beba6LFuFzvfwq/t6CJwVWD wd6mif+1eTtR9wxZcsmefsbB6r9zOd4eWRaCBjmW3fm9xNY2UDzWT29YpyDOyA8R llu44gDtlJvDpyUYi44rLDyZO886fJtlVLyOHOaVJy77SV+so16P9qC2qd9dJXtw 8/exWxNmiA/LwVq+SvvVgfY33yCynKv5St1cHMDDFzC1eZMnVGAaZ4HBp1wiGGuN T1ZWKMDWViH5F7ug2pKopKoemQyhmsa8JbUQc+NZS+5efdn6LlVhe1BVZ+4/A3jb BQ838lkl3O8D0XkS7urM6Ggs8m/D0eBLBpfgID/C4OaEJnn6G1ZVvNue5r99SNws JV9T7zJQ8G1NKl3s1+JrwBf7XeSKtlZa0cbWejbe4Ib2u+G9M863YS0Ivrk5yH+C XIojuxjOOmQ= =wth0 -----END PGP SIGNATURE----- Merge tag 'iio-for-6.7a' of https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio into char-misc-next Jonathan writes: IIO: 1st set of new device support, features and cleanup for 6.7 Particularly great to see a resolver driver move out of staging via a massive set of changes. Only took 13 years :) One small patch added then reverted due to a report of test breakage (ashai-kasei,ak8975: Drop deprecated enums.) An immutable branch was used for some hid-senors changes in case there was a need to take them into the HID tree as well. New device support ----------------- adi,hmc425a - Add support for HMC540SLP3E broadband 4-bit digital attenuator. kionix,kx022a - Add support for the kx132-1211 accelerometer. Require significant driver rework to enable this including add a chip type specific structure to deal with the chip differences. - Add support for the kx132acr-lbz accelerometer (subset of the kx022a feature set). lltc,ltc2309 - New driver for this 8 channel ADC. microchip,mcp3911 - Add support for rest of mcp391x family of ADCs (there are various differences beyond simple channel count variation. Series includes some general driver cleanup. microchip,mcp3564 - New driver for MCP3461, MCP3462, MCP3464, MCP3541, MCP3562, MCP3564 and their R variants of 16/24bit ADCs. A few minor fixed followed. rohm,bu1390 - New driver for this pressure sensor. Staging graduation ------------------ adi,ad1210 (after 13 or so years :) - More or less a complete (step-wise) rewrite of this resolver driver to bring it up to date with modern IIO standards. The fault signal handling mapping to event channels was particularly complex and significant part of the changes. Features -------- iio-core - Add chromacity and color temperature channel types. adi,ad7192 - Oversampling ratio control (called fast settling in datasheet). adi,adis16475 - Add core support and then driver support for delta angle and delta velocity channels. These are intended for summation to establish angle and velocity changes over larger timescales. Fix was needed for alignment after the temperature channel. Further fix reduced set of devices for which the buffer support was applicable as seems burst reads don't cover these on all devices. hid-sensors-als - Chromacity and color temperatures support including in amd sfh. stx104 - Add support for counter subsystem to this multipurpose device. ti,twl6030 - Add missing device tree binding description. Clean up and minor fixes. ------------------------ treewide - Drop some unused declarations across IIO. - Make more use of device_get_match_data() instead of OF specific approaches. Similar cleanup to sets of drivers. - Stop platform remove callbacks returning anything by using the temporary remove_new() callback. - Use i2c_get_match_data() to cope nicely with all types of ID table entry. - Use device_get_match_data() for various platform device to cope with more types of firmware. - Convert from enum to pointer in ID tables allowing use of i2c_get_match_data(). - Fix sorting on some ID tables. - Include specific string helper headers rather than simply string_helpers.h docs - Better description of the ordering requirements etc for available_scan_masks. tools - Handle alignment of mixed sizes where the last element isn't the biggest correctly. Seems that doesn't happen often! adi,ad2s1210 - Lots of work from David Lechner on this driver including a few fixes that are going with the rework to avoid slowing that down. adi,ad4310 - Replace deprecated devm_clk_register() adi,ad74413r - Bring the channel function setting inline with the datasheet. adi,ad7192 - Change to FIELD_PREP(), FIELD_GET(). - Calculate f_order from the sinc filter and chop filter states. - Move more per chip config into data in struct ad7192_chip_info - Cleanup unused parameter in channel macros. adi,adf4350 - Make use of devm_* to simplify error handling for many of the setup calls in probe() / tear down in remove() and error paths. Some more work to be done on this one. - Use dev_err_probe() for errors in probe() callback. adi,adf4413 - Typo in function name prefix. adi,adxl345 - Add channel scale to the chip type specific structure and drop using a type field previously used for indirection. asahi,ak8985 - Fix a mismatch introduced when switching from enum->pointers in the match tables. amlogic,meson - Expand error logging during probe. invensense,mpu6050 - Support level-shifter control. Whilst no one is sure exactly what this is doing it is needed for some old boards. - Document mount-matrix dt-binding. mediatek,mt6577 - Use devm_clk_get_enabled() to replace open coded version and move everything over to being device managed. Drop now empty remove() callback. Fix follows to put the drvdata back. - Use dev_err_probe() for error reporting in probe() callback. memsic,mxc4005 - Add of_match_table. microchip,mcp4725 - Move various chip specific data from being looked up by chip ID to data in the chip type specific structure. silicon-labs,si7005 - Add of_match_table and entry in trivial-devices.yaml st,lsm6dsx - Add missing mount-matrix dt binding documentation. st,spear - Use devm_clk_get_enabled() and some other devm calls to move everything over to being device managed. Drop now empty remove() callback. - Use dev_err_probe() to better handled deferred probing and tidy up error reporting in probe() callback. st,stm32-adc - Add a bit of additional checking in probe() to protect against a NULL pointer (no known path to trigger it today). - Replace deprecated strncpy() ti,ads1015 - Allow for edge triggers. - Document interrupt in dt-bindings. * tag 'iio-for-6.7a' of https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio: (201 commits) iio: Use device_get_match_data() iio: adc: MCP3564: fix warn: unsigned '__x' is never less than zero. dt-bindings: trivial-devices: add silabs,si7005 iio: si7005: Add device tree support drivers: imu: adis16475.c: Remove scan index from delta channels dt-bindings: iio: imu: st,lsm6dsx: add mount-matrix property iio: resolver: ad2s1210: remove of_match_ptr() iio: resolver: ad2s1210: remove DRV_NAME macro iio: resolver: ad2s1210: move out of staging staging: iio: resolver: ad2s1210: simplify code with guard(mutex) staging: iio: resolver: ad2s1210: clear faults after soft reset staging: iio: resolver: ad2s1210: refactor sample toggle staging: iio: resolver: ad2s1210: remove fault attribute staging: iio: resolver: ad2s1210: add label attribute support staging: iio: resolver: ad2s1210: add register/fault support summary staging: iio: resolver: ad2s1210: implement fault events iio: event: add optional event label support staging: iio: resolver: ad2s1210: rename DOS reset min/max attrs staging: iio: resolver: ad2s1210: convert DOS mismatch threshold to event attr staging: iio: resolver: ad2s1210: convert DOS overrange threshold to event attr ...
501 lines
14 KiB
C
501 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* NXP i.MX8QXP ADC driver
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*
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* Based on the work of Haibo Chen <haibo.chen@nxp.com>
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* The initial developer of the original code is Haibo Chen.
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* Portions created by Haibo Chen are Copyright (C) 2018 NXP.
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* All Rights Reserved.
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*
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* Copyright (C) 2018 NXP
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* Copyright (C) 2021 Cai Huoqing
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*/
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#include <linux/bitfield.h>
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#include <linux/bits.h>
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#include <linux/clk.h>
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#include <linux/completion.h>
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#include <linux/delay.h>
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#include <linux/err.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/mod_devicetable.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/pm_runtime.h>
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#include <linux/regulator/consumer.h>
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#include <linux/iio/iio.h>
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#define ADC_DRIVER_NAME "imx8qxp-adc"
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/* Register map definition */
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#define IMX8QXP_ADR_ADC_CTRL 0x10
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#define IMX8QXP_ADR_ADC_STAT 0x14
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#define IMX8QXP_ADR_ADC_IE 0x18
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#define IMX8QXP_ADR_ADC_DE 0x1c
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#define IMX8QXP_ADR_ADC_CFG 0x20
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#define IMX8QXP_ADR_ADC_FCTRL 0x30
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#define IMX8QXP_ADR_ADC_SWTRIG 0x34
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#define IMX8QXP_ADR_ADC_TCTRL(tid) (0xc0 + (tid) * 4)
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#define IMX8QXP_ADR_ADC_CMDL(cid) (0x100 + (cid) * 8)
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#define IMX8QXP_ADR_ADC_CMDH(cid) (0x104 + (cid) * 8)
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#define IMX8QXP_ADR_ADC_RESFIFO 0x300
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#define IMX8QXP_ADR_ADC_TST 0xffc
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/* ADC bit shift */
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#define IMX8QXP_ADC_IE_FWMIE_MASK GENMASK(1, 0)
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#define IMX8QXP_ADC_CTRL_FIFO_RESET_MASK BIT(8)
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#define IMX8QXP_ADC_CTRL_SOFTWARE_RESET_MASK BIT(1)
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#define IMX8QXP_ADC_CTRL_ADC_EN_MASK BIT(0)
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#define IMX8QXP_ADC_TCTRL_TCMD_MASK GENMASK(31, 24)
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#define IMX8QXP_ADC_TCTRL_TDLY_MASK GENMASK(23, 16)
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#define IMX8QXP_ADC_TCTRL_TPRI_MASK GENMASK(15, 8)
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#define IMX8QXP_ADC_TCTRL_HTEN_MASK GENMASK(7, 0)
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#define IMX8QXP_ADC_CMDL_CSCALE_MASK GENMASK(13, 8)
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#define IMX8QXP_ADC_CMDL_MODE_MASK BIT(7)
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#define IMX8QXP_ADC_CMDL_DIFF_MASK BIT(6)
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#define IMX8QXP_ADC_CMDL_ABSEL_MASK BIT(5)
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#define IMX8QXP_ADC_CMDL_ADCH_MASK GENMASK(2, 0)
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#define IMX8QXP_ADC_CMDH_NEXT_MASK GENMASK(31, 24)
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#define IMX8QXP_ADC_CMDH_LOOP_MASK GENMASK(23, 16)
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#define IMX8QXP_ADC_CMDH_AVGS_MASK GENMASK(15, 12)
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#define IMX8QXP_ADC_CMDH_STS_MASK BIT(8)
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#define IMX8QXP_ADC_CMDH_LWI_MASK GENMASK(7, 7)
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#define IMX8QXP_ADC_CMDH_CMPEN_MASK GENMASK(0, 0)
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#define IMX8QXP_ADC_CFG_PWREN_MASK BIT(28)
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#define IMX8QXP_ADC_CFG_PUDLY_MASK GENMASK(23, 16)
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#define IMX8QXP_ADC_CFG_REFSEL_MASK GENMASK(7, 6)
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#define IMX8QXP_ADC_CFG_PWRSEL_MASK GENMASK(5, 4)
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#define IMX8QXP_ADC_CFG_TPRICTRL_MASK GENMASK(3, 0)
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#define IMX8QXP_ADC_FCTRL_FWMARK_MASK GENMASK(20, 16)
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#define IMX8QXP_ADC_FCTRL_FCOUNT_MASK GENMASK(4, 0)
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#define IMX8QXP_ADC_RESFIFO_VAL_MASK GENMASK(18, 3)
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/* ADC PARAMETER*/
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#define IMX8QXP_ADC_CMDL_CHANNEL_SCALE_FULL GENMASK(5, 0)
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#define IMX8QXP_ADC_CMDL_SEL_A_A_B_CHANNEL 0
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#define IMX8QXP_ADC_CMDL_STANDARD_RESOLUTION 0
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#define IMX8QXP_ADC_CMDL_MODE_SINGLE 0
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#define IMX8QXP_ADC_CMDH_LWI_INCREMENT_DIS 0
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#define IMX8QXP_ADC_CMDH_CMPEN_DIS 0
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#define IMX8QXP_ADC_PAUSE_EN BIT(31)
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#define IMX8QXP_ADC_TCTRL_TPRI_PRIORITY_HIGH 0
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#define IMX8QXP_ADC_TCTRL_HTEN_HW_TIRG_DIS 0
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#define IMX8QXP_ADC_TIMEOUT msecs_to_jiffies(100)
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#define IMX8QXP_ADC_MAX_FIFO_SIZE 16
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struct imx8qxp_adc {
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struct device *dev;
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void __iomem *regs;
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struct clk *clk;
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struct clk *ipg_clk;
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struct regulator *vref;
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/* Serialise ADC channel reads */
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struct mutex lock;
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struct completion completion;
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u32 fifo[IMX8QXP_ADC_MAX_FIFO_SIZE];
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};
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#define IMX8QXP_ADC_CHAN(_idx) { \
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.type = IIO_VOLTAGE, \
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.indexed = 1, \
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.channel = (_idx), \
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \
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BIT(IIO_CHAN_INFO_SAMP_FREQ), \
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}
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static const struct iio_chan_spec imx8qxp_adc_iio_channels[] = {
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IMX8QXP_ADC_CHAN(0),
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IMX8QXP_ADC_CHAN(1),
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IMX8QXP_ADC_CHAN(2),
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IMX8QXP_ADC_CHAN(3),
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IMX8QXP_ADC_CHAN(4),
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IMX8QXP_ADC_CHAN(5),
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IMX8QXP_ADC_CHAN(6),
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IMX8QXP_ADC_CHAN(7),
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};
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static void imx8qxp_adc_reset(struct imx8qxp_adc *adc)
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{
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u32 ctrl;
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/*software reset, need to clear the set bit*/
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ctrl = readl(adc->regs + IMX8QXP_ADR_ADC_CTRL);
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ctrl |= FIELD_PREP(IMX8QXP_ADC_CTRL_SOFTWARE_RESET_MASK, 1);
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writel(ctrl, adc->regs + IMX8QXP_ADR_ADC_CTRL);
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udelay(10);
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ctrl &= ~FIELD_PREP(IMX8QXP_ADC_CTRL_SOFTWARE_RESET_MASK, 1);
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writel(ctrl, adc->regs + IMX8QXP_ADR_ADC_CTRL);
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/* reset the fifo */
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ctrl |= FIELD_PREP(IMX8QXP_ADC_CTRL_FIFO_RESET_MASK, 1);
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writel(ctrl, adc->regs + IMX8QXP_ADR_ADC_CTRL);
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}
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static void imx8qxp_adc_reg_config(struct imx8qxp_adc *adc, int channel)
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{
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u32 adc_cfg, adc_tctrl, adc_cmdl, adc_cmdh;
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/* ADC configuration */
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adc_cfg = FIELD_PREP(IMX8QXP_ADC_CFG_PWREN_MASK, 1) |
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FIELD_PREP(IMX8QXP_ADC_CFG_PUDLY_MASK, 0x80)|
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FIELD_PREP(IMX8QXP_ADC_CFG_REFSEL_MASK, 0) |
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FIELD_PREP(IMX8QXP_ADC_CFG_PWRSEL_MASK, 3) |
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FIELD_PREP(IMX8QXP_ADC_CFG_TPRICTRL_MASK, 0);
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writel(adc_cfg, adc->regs + IMX8QXP_ADR_ADC_CFG);
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/* config the trigger control */
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adc_tctrl = FIELD_PREP(IMX8QXP_ADC_TCTRL_TCMD_MASK, 1) |
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FIELD_PREP(IMX8QXP_ADC_TCTRL_TDLY_MASK, 0) |
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FIELD_PREP(IMX8QXP_ADC_TCTRL_TPRI_MASK, IMX8QXP_ADC_TCTRL_TPRI_PRIORITY_HIGH) |
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FIELD_PREP(IMX8QXP_ADC_TCTRL_HTEN_MASK, IMX8QXP_ADC_TCTRL_HTEN_HW_TIRG_DIS);
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writel(adc_tctrl, adc->regs + IMX8QXP_ADR_ADC_TCTRL(0));
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/* config the cmd */
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adc_cmdl = FIELD_PREP(IMX8QXP_ADC_CMDL_CSCALE_MASK, IMX8QXP_ADC_CMDL_CHANNEL_SCALE_FULL) |
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FIELD_PREP(IMX8QXP_ADC_CMDL_MODE_MASK, IMX8QXP_ADC_CMDL_STANDARD_RESOLUTION) |
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FIELD_PREP(IMX8QXP_ADC_CMDL_DIFF_MASK, IMX8QXP_ADC_CMDL_MODE_SINGLE) |
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FIELD_PREP(IMX8QXP_ADC_CMDL_ABSEL_MASK, IMX8QXP_ADC_CMDL_SEL_A_A_B_CHANNEL) |
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FIELD_PREP(IMX8QXP_ADC_CMDL_ADCH_MASK, channel);
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writel(adc_cmdl, adc->regs + IMX8QXP_ADR_ADC_CMDL(0));
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adc_cmdh = FIELD_PREP(IMX8QXP_ADC_CMDH_NEXT_MASK, 0) |
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FIELD_PREP(IMX8QXP_ADC_CMDH_LOOP_MASK, 0) |
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FIELD_PREP(IMX8QXP_ADC_CMDH_AVGS_MASK, 7) |
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FIELD_PREP(IMX8QXP_ADC_CMDH_STS_MASK, 0) |
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FIELD_PREP(IMX8QXP_ADC_CMDH_LWI_MASK, IMX8QXP_ADC_CMDH_LWI_INCREMENT_DIS) |
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FIELD_PREP(IMX8QXP_ADC_CMDH_CMPEN_MASK, IMX8QXP_ADC_CMDH_CMPEN_DIS);
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writel(adc_cmdh, adc->regs + IMX8QXP_ADR_ADC_CMDH(0));
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}
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static void imx8qxp_adc_fifo_config(struct imx8qxp_adc *adc)
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{
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u32 fifo_ctrl, interrupt_en;
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fifo_ctrl = readl(adc->regs + IMX8QXP_ADR_ADC_FCTRL);
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fifo_ctrl &= ~IMX8QXP_ADC_FCTRL_FWMARK_MASK;
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/* set the watermark level to 1 */
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fifo_ctrl |= FIELD_PREP(IMX8QXP_ADC_FCTRL_FWMARK_MASK, 0);
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writel(fifo_ctrl, adc->regs + IMX8QXP_ADR_ADC_FCTRL);
|
|
|
|
/* FIFO Watermark Interrupt Enable */
|
|
interrupt_en = readl(adc->regs + IMX8QXP_ADR_ADC_IE);
|
|
interrupt_en |= FIELD_PREP(IMX8QXP_ADC_IE_FWMIE_MASK, 1);
|
|
writel(interrupt_en, adc->regs + IMX8QXP_ADR_ADC_IE);
|
|
}
|
|
|
|
static void imx8qxp_adc_disable(struct imx8qxp_adc *adc)
|
|
{
|
|
u32 ctrl;
|
|
|
|
ctrl = readl(adc->regs + IMX8QXP_ADR_ADC_CTRL);
|
|
ctrl &= ~FIELD_PREP(IMX8QXP_ADC_CTRL_ADC_EN_MASK, 1);
|
|
writel(ctrl, adc->regs + IMX8QXP_ADR_ADC_CTRL);
|
|
}
|
|
|
|
static int imx8qxp_adc_read_raw(struct iio_dev *indio_dev,
|
|
struct iio_chan_spec const *chan,
|
|
int *val, int *val2, long mask)
|
|
{
|
|
struct imx8qxp_adc *adc = iio_priv(indio_dev);
|
|
struct device *dev = adc->dev;
|
|
|
|
u32 ctrl;
|
|
long ret;
|
|
|
|
switch (mask) {
|
|
case IIO_CHAN_INFO_RAW:
|
|
pm_runtime_get_sync(dev);
|
|
|
|
mutex_lock(&adc->lock);
|
|
reinit_completion(&adc->completion);
|
|
|
|
imx8qxp_adc_reg_config(adc, chan->channel);
|
|
|
|
imx8qxp_adc_fifo_config(adc);
|
|
|
|
/* adc enable */
|
|
ctrl = readl(adc->regs + IMX8QXP_ADR_ADC_CTRL);
|
|
ctrl |= FIELD_PREP(IMX8QXP_ADC_CTRL_ADC_EN_MASK, 1);
|
|
writel(ctrl, adc->regs + IMX8QXP_ADR_ADC_CTRL);
|
|
/* adc start */
|
|
writel(1, adc->regs + IMX8QXP_ADR_ADC_SWTRIG);
|
|
|
|
ret = wait_for_completion_interruptible_timeout(&adc->completion,
|
|
IMX8QXP_ADC_TIMEOUT);
|
|
|
|
pm_runtime_mark_last_busy(dev);
|
|
pm_runtime_put_sync_autosuspend(dev);
|
|
|
|
if (ret == 0) {
|
|
mutex_unlock(&adc->lock);
|
|
return -ETIMEDOUT;
|
|
}
|
|
if (ret < 0) {
|
|
mutex_unlock(&adc->lock);
|
|
return ret;
|
|
}
|
|
|
|
*val = adc->fifo[0];
|
|
|
|
mutex_unlock(&adc->lock);
|
|
return IIO_VAL_INT;
|
|
|
|
case IIO_CHAN_INFO_SCALE:
|
|
ret = regulator_get_voltage(adc->vref);
|
|
if (ret < 0)
|
|
return ret;
|
|
*val = ret / 1000;
|
|
*val2 = 12;
|
|
return IIO_VAL_FRACTIONAL_LOG2;
|
|
|
|
case IIO_CHAN_INFO_SAMP_FREQ:
|
|
*val = clk_get_rate(adc->clk) / 3;
|
|
return IIO_VAL_INT;
|
|
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
static irqreturn_t imx8qxp_adc_isr(int irq, void *dev_id)
|
|
{
|
|
struct imx8qxp_adc *adc = dev_id;
|
|
u32 fifo_count;
|
|
int i;
|
|
|
|
fifo_count = FIELD_GET(IMX8QXP_ADC_FCTRL_FCOUNT_MASK,
|
|
readl(adc->regs + IMX8QXP_ADR_ADC_FCTRL));
|
|
|
|
for (i = 0; i < fifo_count; i++)
|
|
adc->fifo[i] = FIELD_GET(IMX8QXP_ADC_RESFIFO_VAL_MASK,
|
|
readl_relaxed(adc->regs + IMX8QXP_ADR_ADC_RESFIFO));
|
|
|
|
if (fifo_count)
|
|
complete(&adc->completion);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int imx8qxp_adc_reg_access(struct iio_dev *indio_dev, unsigned int reg,
|
|
unsigned int writeval, unsigned int *readval)
|
|
{
|
|
struct imx8qxp_adc *adc = iio_priv(indio_dev);
|
|
struct device *dev = adc->dev;
|
|
|
|
if (!readval || reg % 4 || reg > IMX8QXP_ADR_ADC_TST)
|
|
return -EINVAL;
|
|
|
|
pm_runtime_get_sync(dev);
|
|
|
|
*readval = readl(adc->regs + reg);
|
|
|
|
pm_runtime_mark_last_busy(dev);
|
|
pm_runtime_put_sync_autosuspend(dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct iio_info imx8qxp_adc_iio_info = {
|
|
.read_raw = &imx8qxp_adc_read_raw,
|
|
.debugfs_reg_access = &imx8qxp_adc_reg_access,
|
|
};
|
|
|
|
static int imx8qxp_adc_probe(struct platform_device *pdev)
|
|
{
|
|
struct imx8qxp_adc *adc;
|
|
struct iio_dev *indio_dev;
|
|
struct device *dev = &pdev->dev;
|
|
int irq;
|
|
int ret;
|
|
|
|
indio_dev = devm_iio_device_alloc(dev, sizeof(*adc));
|
|
if (!indio_dev) {
|
|
dev_err(dev, "Failed allocating iio device\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
adc = iio_priv(indio_dev);
|
|
adc->dev = dev;
|
|
|
|
mutex_init(&adc->lock);
|
|
adc->regs = devm_platform_ioremap_resource(pdev, 0);
|
|
if (IS_ERR(adc->regs))
|
|
return PTR_ERR(adc->regs);
|
|
|
|
irq = platform_get_irq(pdev, 0);
|
|
if (irq < 0)
|
|
return irq;
|
|
|
|
adc->clk = devm_clk_get(dev, "per");
|
|
if (IS_ERR(adc->clk))
|
|
return dev_err_probe(dev, PTR_ERR(adc->clk), "Failed getting clock\n");
|
|
|
|
adc->ipg_clk = devm_clk_get(dev, "ipg");
|
|
if (IS_ERR(adc->ipg_clk))
|
|
return dev_err_probe(dev, PTR_ERR(adc->ipg_clk), "Failed getting clock\n");
|
|
|
|
adc->vref = devm_regulator_get(dev, "vref");
|
|
if (IS_ERR(adc->vref))
|
|
return dev_err_probe(dev, PTR_ERR(adc->vref), "Failed getting reference voltage\n");
|
|
|
|
ret = regulator_enable(adc->vref);
|
|
if (ret) {
|
|
dev_err(dev, "Can't enable adc reference top voltage\n");
|
|
return ret;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, indio_dev);
|
|
|
|
init_completion(&adc->completion);
|
|
|
|
indio_dev->name = ADC_DRIVER_NAME;
|
|
indio_dev->info = &imx8qxp_adc_iio_info;
|
|
indio_dev->modes = INDIO_DIRECT_MODE;
|
|
indio_dev->channels = imx8qxp_adc_iio_channels;
|
|
indio_dev->num_channels = ARRAY_SIZE(imx8qxp_adc_iio_channels);
|
|
|
|
ret = clk_prepare_enable(adc->clk);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "Could not prepare or enable the clock.\n");
|
|
goto error_regulator_disable;
|
|
}
|
|
|
|
ret = clk_prepare_enable(adc->ipg_clk);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "Could not prepare or enable the clock.\n");
|
|
goto error_adc_clk_disable;
|
|
}
|
|
|
|
ret = devm_request_irq(dev, irq, imx8qxp_adc_isr, 0, ADC_DRIVER_NAME, adc);
|
|
if (ret < 0) {
|
|
dev_err(dev, "Failed requesting irq, irq = %d\n", irq);
|
|
goto error_ipg_clk_disable;
|
|
}
|
|
|
|
imx8qxp_adc_reset(adc);
|
|
|
|
ret = iio_device_register(indio_dev);
|
|
if (ret) {
|
|
imx8qxp_adc_disable(adc);
|
|
dev_err(dev, "Couldn't register the device.\n");
|
|
goto error_ipg_clk_disable;
|
|
}
|
|
|
|
pm_runtime_set_active(dev);
|
|
pm_runtime_set_autosuspend_delay(dev, 50);
|
|
pm_runtime_use_autosuspend(dev);
|
|
pm_runtime_enable(dev);
|
|
|
|
return 0;
|
|
|
|
error_ipg_clk_disable:
|
|
clk_disable_unprepare(adc->ipg_clk);
|
|
error_adc_clk_disable:
|
|
clk_disable_unprepare(adc->clk);
|
|
error_regulator_disable:
|
|
regulator_disable(adc->vref);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void imx8qxp_adc_remove(struct platform_device *pdev)
|
|
{
|
|
struct iio_dev *indio_dev = platform_get_drvdata(pdev);
|
|
struct imx8qxp_adc *adc = iio_priv(indio_dev);
|
|
struct device *dev = adc->dev;
|
|
|
|
pm_runtime_get_sync(dev);
|
|
|
|
iio_device_unregister(indio_dev);
|
|
|
|
imx8qxp_adc_disable(adc);
|
|
|
|
clk_disable_unprepare(adc->clk);
|
|
clk_disable_unprepare(adc->ipg_clk);
|
|
regulator_disable(adc->vref);
|
|
|
|
pm_runtime_disable(dev);
|
|
pm_runtime_put_noidle(dev);
|
|
}
|
|
|
|
static int imx8qxp_adc_runtime_suspend(struct device *dev)
|
|
{
|
|
struct iio_dev *indio_dev = dev_get_drvdata(dev);
|
|
struct imx8qxp_adc *adc = iio_priv(indio_dev);
|
|
|
|
imx8qxp_adc_disable(adc);
|
|
|
|
clk_disable_unprepare(adc->clk);
|
|
clk_disable_unprepare(adc->ipg_clk);
|
|
regulator_disable(adc->vref);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int imx8qxp_adc_runtime_resume(struct device *dev)
|
|
{
|
|
struct iio_dev *indio_dev = dev_get_drvdata(dev);
|
|
struct imx8qxp_adc *adc = iio_priv(indio_dev);
|
|
int ret;
|
|
|
|
ret = regulator_enable(adc->vref);
|
|
if (ret) {
|
|
dev_err(dev, "Can't enable adc reference top voltage, err = %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
ret = clk_prepare_enable(adc->clk);
|
|
if (ret) {
|
|
dev_err(dev, "Could not prepare or enable clock.\n");
|
|
goto err_disable_reg;
|
|
}
|
|
|
|
ret = clk_prepare_enable(adc->ipg_clk);
|
|
if (ret) {
|
|
dev_err(dev, "Could not prepare or enable clock.\n");
|
|
goto err_unprepare_clk;
|
|
}
|
|
|
|
imx8qxp_adc_reset(adc);
|
|
|
|
return 0;
|
|
|
|
err_unprepare_clk:
|
|
clk_disable_unprepare(adc->clk);
|
|
|
|
err_disable_reg:
|
|
regulator_disable(adc->vref);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static DEFINE_RUNTIME_DEV_PM_OPS(imx8qxp_adc_pm_ops,
|
|
imx8qxp_adc_runtime_suspend,
|
|
imx8qxp_adc_runtime_resume, NULL);
|
|
|
|
static const struct of_device_id imx8qxp_adc_match[] = {
|
|
{ .compatible = "nxp,imx8qxp-adc", },
|
|
{ /* sentinel */ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, imx8qxp_adc_match);
|
|
|
|
static struct platform_driver imx8qxp_adc_driver = {
|
|
.probe = imx8qxp_adc_probe,
|
|
.remove_new = imx8qxp_adc_remove,
|
|
.driver = {
|
|
.name = ADC_DRIVER_NAME,
|
|
.of_match_table = imx8qxp_adc_match,
|
|
.pm = pm_ptr(&imx8qxp_adc_pm_ops),
|
|
},
|
|
};
|
|
|
|
module_platform_driver(imx8qxp_adc_driver);
|
|
|
|
MODULE_DESCRIPTION("i.MX8QuadXPlus ADC driver");
|
|
MODULE_LICENSE("GPL v2");
|