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287 lines
5.8 KiB
287 lines
5.8 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* PISMO memory driver - http://www.pismoworld.org/ |
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* |
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* For ARM Realview and Versatile platforms |
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*/ |
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#include <linux/init.h> |
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#include <linux/module.h> |
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#include <linux/i2c.h> |
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#include <linux/slab.h> |
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#include <linux/platform_device.h> |
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#include <linux/spinlock.h> |
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#include <linux/mutex.h> |
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#include <linux/mtd/physmap.h> |
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#include <linux/mtd/plat-ram.h> |
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#include <linux/mtd/pismo.h> |
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#define PISMO_NUM_CS 5 |
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struct pismo_cs_block { |
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u8 type; |
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u8 width; |
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__le16 access; |
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__le32 size; |
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u32 reserved[2]; |
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char device[32]; |
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} __packed; |
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struct pismo_eeprom { |
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struct pismo_cs_block cs[PISMO_NUM_CS]; |
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char board[15]; |
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u8 sum; |
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} __packed; |
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struct pismo_mem { |
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phys_addr_t base; |
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u32 size; |
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u16 access; |
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u8 width; |
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u8 type; |
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}; |
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struct pismo_data { |
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struct i2c_client *client; |
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void (*vpp)(void *, int); |
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void *vpp_data; |
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struct platform_device *dev[PISMO_NUM_CS]; |
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}; |
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static void pismo_set_vpp(struct platform_device *pdev, int on) |
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{ |
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struct i2c_client *client = to_i2c_client(pdev->dev.parent); |
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struct pismo_data *pismo = i2c_get_clientdata(client); |
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pismo->vpp(pismo->vpp_data, on); |
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} |
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static unsigned int pismo_width_to_bytes(unsigned int width) |
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{ |
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width &= 15; |
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if (width > 2) |
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return 0; |
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return 1 << width; |
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} |
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static int pismo_eeprom_read(struct i2c_client *client, void *buf, u8 addr, |
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size_t size) |
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{ |
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int ret; |
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struct i2c_msg msg[] = { |
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{ |
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.addr = client->addr, |
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.len = sizeof(addr), |
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.buf = &addr, |
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}, { |
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.addr = client->addr, |
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.flags = I2C_M_RD, |
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.len = size, |
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.buf = buf, |
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}, |
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}; |
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ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg)); |
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return ret == ARRAY_SIZE(msg) ? size : -EIO; |
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} |
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static int pismo_add_device(struct pismo_data *pismo, int i, |
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struct pismo_mem *region, const char *name, |
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void *pdata, size_t psize) |
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{ |
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struct platform_device *dev; |
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struct resource res = { }; |
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phys_addr_t base = region->base; |
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int ret; |
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if (base == ~0) |
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return -ENXIO; |
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res.start = base; |
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res.end = base + region->size - 1; |
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res.flags = IORESOURCE_MEM; |
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dev = platform_device_alloc(name, i); |
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if (!dev) |
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return -ENOMEM; |
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dev->dev.parent = &pismo->client->dev; |
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do { |
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ret = platform_device_add_resources(dev, &res, 1); |
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if (ret) |
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break; |
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ret = platform_device_add_data(dev, pdata, psize); |
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if (ret) |
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break; |
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ret = platform_device_add(dev); |
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if (ret) |
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break; |
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pismo->dev[i] = dev; |
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return 0; |
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} while (0); |
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platform_device_put(dev); |
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return ret; |
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} |
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static int pismo_add_nor(struct pismo_data *pismo, int i, |
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struct pismo_mem *region) |
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{ |
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struct physmap_flash_data data = { |
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.width = region->width, |
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}; |
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if (pismo->vpp) |
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data.set_vpp = pismo_set_vpp; |
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return pismo_add_device(pismo, i, region, "physmap-flash", |
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&data, sizeof(data)); |
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} |
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static int pismo_add_sram(struct pismo_data *pismo, int i, |
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struct pismo_mem *region) |
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{ |
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struct platdata_mtd_ram data = { |
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.bankwidth = region->width, |
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}; |
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return pismo_add_device(pismo, i, region, "mtd-ram", |
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&data, sizeof(data)); |
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} |
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static void pismo_add_one(struct pismo_data *pismo, int i, |
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const struct pismo_cs_block *cs, phys_addr_t base) |
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{ |
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struct device *dev = &pismo->client->dev; |
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struct pismo_mem region; |
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region.base = base; |
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region.type = cs->type; |
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region.width = pismo_width_to_bytes(cs->width); |
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region.access = le16_to_cpu(cs->access); |
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region.size = le32_to_cpu(cs->size); |
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if (region.width == 0) { |
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dev_err(dev, "cs%u: bad width: %02x, ignoring\n", i, cs->width); |
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return; |
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} |
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/* |
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* FIXME: may need to the platforms memory controller here, but at |
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* the moment we assume that it has already been correctly setup. |
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* The memory controller can also tell us the base address as well. |
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*/ |
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dev_info(dev, "cs%u: %.32s: type %02x access %u00ps size %uK\n", |
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i, cs->device, region.type, region.access, region.size / 1024); |
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switch (region.type) { |
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case 0: |
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break; |
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case 1: |
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/* static DOC */ |
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break; |
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case 2: |
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/* static NOR */ |
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pismo_add_nor(pismo, i, ®ion); |
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break; |
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case 3: |
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/* static RAM */ |
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pismo_add_sram(pismo, i, ®ion); |
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break; |
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} |
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} |
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static int pismo_remove(struct i2c_client *client) |
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{ |
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struct pismo_data *pismo = i2c_get_clientdata(client); |
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int i; |
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for (i = 0; i < ARRAY_SIZE(pismo->dev); i++) |
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platform_device_unregister(pismo->dev[i]); |
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kfree(pismo); |
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return 0; |
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} |
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static int pismo_probe(struct i2c_client *client, |
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const struct i2c_device_id *id) |
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{ |
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struct pismo_pdata *pdata = client->dev.platform_data; |
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struct pismo_eeprom eeprom; |
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struct pismo_data *pismo; |
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int ret, i; |
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { |
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dev_err(&client->dev, "functionality mismatch\n"); |
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return -EIO; |
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} |
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pismo = kzalloc(sizeof(*pismo), GFP_KERNEL); |
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if (!pismo) |
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return -ENOMEM; |
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pismo->client = client; |
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if (pdata) { |
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pismo->vpp = pdata->set_vpp; |
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pismo->vpp_data = pdata->vpp_data; |
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} |
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i2c_set_clientdata(client, pismo); |
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ret = pismo_eeprom_read(client, &eeprom, 0, sizeof(eeprom)); |
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if (ret < 0) { |
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dev_err(&client->dev, "error reading EEPROM: %d\n", ret); |
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goto exit_free; |
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} |
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dev_info(&client->dev, "%.15s board found\n", eeprom.board); |
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for (i = 0; i < ARRAY_SIZE(eeprom.cs); i++) |
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if (eeprom.cs[i].type != 0xff) |
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pismo_add_one(pismo, i, &eeprom.cs[i], |
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pdata->cs_addrs[i]); |
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return 0; |
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exit_free: |
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kfree(pismo); |
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return ret; |
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} |
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static const struct i2c_device_id pismo_id[] = { |
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{ "pismo" }, |
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{ }, |
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}; |
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MODULE_DEVICE_TABLE(i2c, pismo_id); |
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static struct i2c_driver pismo_driver = { |
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.driver = { |
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.name = "pismo", |
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}, |
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.probe = pismo_probe, |
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.remove = pismo_remove, |
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.id_table = pismo_id, |
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}; |
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static int __init pismo_init(void) |
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{ |
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BUILD_BUG_ON(sizeof(struct pismo_cs_block) != 48); |
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BUILD_BUG_ON(sizeof(struct pismo_eeprom) != 256); |
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return i2c_add_driver(&pismo_driver); |
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} |
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module_init(pismo_init); |
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static void __exit pismo_exit(void) |
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{ |
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i2c_del_driver(&pismo_driver); |
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} |
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module_exit(pismo_exit); |
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MODULE_AUTHOR("Russell King <[email protected]>"); |
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MODULE_DESCRIPTION("PISMO memory driver"); |
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MODULE_LICENSE("GPL");
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