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795ddd18d3
nvmem uses regmap_raw_read/write apis to read/write data from providers, regmap raw apis stopped working with recent kernels which removed raw accessors on mmio bus. This resulted in broken nvmem for providers which are based on regmap mmio bus. This issue can be fixed temporarly by moving to other regmap apis, but we might hit same issue in future. Moving to interfaces based on read/write callbacks from providers would be more robust. This patch removes regmap dependency from nvmem and introduces read/write callbacks from the providers. Without this patch nvmem providers like qfprom based on regmap mmio bus would not work. Reported-by: Rajendra Nayak <rjendra@qti.qualcomm.com> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
61 lines
1.5 KiB
C
61 lines
1.5 KiB
C
/*
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* nvmem framework provider.
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*
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* Copyright (C) 2015 Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
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* Copyright (C) 2013 Maxime Ripard <maxime.ripard@free-electrons.com>
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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#ifndef _LINUX_NVMEM_PROVIDER_H
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#define _LINUX_NVMEM_PROVIDER_H
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struct nvmem_device;
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struct nvmem_cell_info;
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typedef int (*nvmem_reg_read_t)(void *priv, unsigned int offset,
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void *val, size_t bytes);
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typedef int (*nvmem_reg_write_t)(void *priv, unsigned int offset,
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void *val, size_t bytes);
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struct nvmem_config {
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struct device *dev;
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const char *name;
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int id;
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struct module *owner;
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const struct nvmem_cell_info *cells;
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int ncells;
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bool read_only;
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bool root_only;
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nvmem_reg_read_t reg_read;
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nvmem_reg_write_t reg_write;
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int size;
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int word_size;
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int stride;
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void *priv;
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/* To be only used by old driver/misc/eeprom drivers */
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bool compat;
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struct device *base_dev;
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};
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#if IS_ENABLED(CONFIG_NVMEM)
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struct nvmem_device *nvmem_register(const struct nvmem_config *cfg);
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int nvmem_unregister(struct nvmem_device *nvmem);
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#else
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static inline struct nvmem_device *nvmem_register(const struct nvmem_config *c)
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{
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return ERR_PTR(-ENOSYS);
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}
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static inline int nvmem_unregister(struct nvmem_device *nvmem)
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{
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return -ENOSYS;
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}
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#endif /* CONFIG_NVMEM */
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#endif /* ifndef _LINUX_NVMEM_PROVIDER_H */
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