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e7fb9c4a AP |
1 | /* |
2 | * l4f00242t03.c -- support for Epson L4F00242T03 LCD | |
3 | * | |
4 | * Copyright 2007-2009 Freescale Semiconductor, Inc. All Rights Reserved. | |
5 | * | |
6 | * Copyright (c) 2009 Alberto Panizzo <maramaopercheseimorto@gmail.com> | |
7 | * Inspired by Marek Vasut work in l4f00242t03.c | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | */ | |
13 | ||
14 | #include <linux/device.h> | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/delay.h> | |
355b200b | 17 | #include <linux/module.h> |
e7fb9c4a AP |
18 | #include <linux/gpio.h> |
19 | #include <linux/lcd.h> | |
5a0e3ad6 | 20 | #include <linux/slab.h> |
e7fb9c4a AP |
21 | #include <linux/regulator/consumer.h> |
22 | ||
23 | #include <linux/spi/spi.h> | |
24 | #include <linux/spi/l4f00242t03.h> | |
25 | ||
26 | struct l4f00242t03_priv { | |
27 | struct spi_device *spi; | |
28 | struct lcd_device *ld; | |
95558ad1 | 29 | int lcd_state; |
e7fb9c4a AP |
30 | struct regulator *io_reg; |
31 | struct regulator *core_reg; | |
32 | }; | |
33 | ||
34 | ||
35 | static void l4f00242t03_reset(unsigned int gpio) | |
36 | { | |
37 | pr_debug("l4f00242t03_reset.\n"); | |
38 | gpio_set_value(gpio, 1); | |
39 | mdelay(100); | |
40 | gpio_set_value(gpio, 0); | |
41 | mdelay(10); /* tRES >= 100us */ | |
42 | gpio_set_value(gpio, 1); | |
43 | mdelay(20); | |
44 | } | |
45 | ||
46 | #define param(x) ((x) | 0x100) | |
47 | ||
48 | static void l4f00242t03_lcd_init(struct spi_device *spi) | |
49 | { | |
50 | struct l4f00242t03_pdata *pdata = spi->dev.platform_data; | |
51 | struct l4f00242t03_priv *priv = dev_get_drvdata(&spi->dev); | |
52 | const u16 cmd[] = { 0x36, param(0), 0x3A, param(0x60) }; | |
53 | ||
54 | dev_dbg(&spi->dev, "initializing LCD\n"); | |
55 | ||
0556dc34 MB |
56 | regulator_set_voltage(priv->io_reg, 1800000, 1800000); |
57 | regulator_enable(priv->io_reg); | |
e7fb9c4a | 58 | |
0556dc34 MB |
59 | regulator_set_voltage(priv->core_reg, 2800000, 2800000); |
60 | regulator_enable(priv->core_reg); | |
e7fb9c4a | 61 | |
aff5ce6c AP |
62 | l4f00242t03_reset(pdata->reset_gpio); |
63 | ||
e7fb9c4a AP |
64 | gpio_set_value(pdata->data_enable_gpio, 1); |
65 | msleep(60); | |
66 | spi_write(spi, (const u8 *)cmd, ARRAY_SIZE(cmd) * sizeof(u16)); | |
67 | } | |
68 | ||
95558ad1 AP |
69 | static void l4f00242t03_lcd_powerdown(struct spi_device *spi) |
70 | { | |
71 | struct l4f00242t03_pdata *pdata = spi->dev.platform_data; | |
72 | struct l4f00242t03_priv *priv = dev_get_drvdata(&spi->dev); | |
73 | ||
74 | dev_dbg(&spi->dev, "Powering down LCD\n"); | |
75 | ||
76 | gpio_set_value(pdata->data_enable_gpio, 0); | |
77 | ||
0556dc34 MB |
78 | regulator_disable(priv->io_reg); |
79 | regulator_disable(priv->core_reg); | |
95558ad1 AP |
80 | } |
81 | ||
82 | static int l4f00242t03_lcd_power_get(struct lcd_device *ld) | |
83 | { | |
84 | struct l4f00242t03_priv *priv = lcd_get_data(ld); | |
85 | ||
86 | return priv->lcd_state; | |
87 | } | |
88 | ||
e7fb9c4a AP |
89 | static int l4f00242t03_lcd_power_set(struct lcd_device *ld, int power) |
90 | { | |
91 | struct l4f00242t03_priv *priv = lcd_get_data(ld); | |
92 | struct spi_device *spi = priv->spi; | |
93 | ||
94 | const u16 slpout = 0x11; | |
95 | const u16 dison = 0x29; | |
96 | ||
97 | const u16 slpin = 0x10; | |
98 | const u16 disoff = 0x28; | |
99 | ||
4dbdf886 | 100 | if (power <= FB_BLANK_NORMAL) { |
95558ad1 AP |
101 | if (priv->lcd_state <= FB_BLANK_NORMAL) { |
102 | /* Do nothing, the LCD is running */ | |
103 | } else if (priv->lcd_state < FB_BLANK_POWERDOWN) { | |
104 | dev_dbg(&spi->dev, "Resuming LCD\n"); | |
105 | ||
106 | spi_write(spi, (const u8 *)&slpout, sizeof(u16)); | |
107 | msleep(60); | |
108 | spi_write(spi, (const u8 *)&dison, sizeof(u16)); | |
109 | } else { | |
110 | /* priv->lcd_state == FB_BLANK_POWERDOWN */ | |
111 | l4f00242t03_lcd_init(spi); | |
112 | priv->lcd_state = FB_BLANK_VSYNC_SUSPEND; | |
113 | l4f00242t03_lcd_power_set(priv->ld, power); | |
114 | } | |
115 | } else if (power < FB_BLANK_POWERDOWN) { | |
116 | if (priv->lcd_state <= FB_BLANK_NORMAL) { | |
117 | /* Send the display in standby */ | |
118 | dev_dbg(&spi->dev, "Standby the LCD\n"); | |
119 | ||
120 | spi_write(spi, (const u8 *)&disoff, sizeof(u16)); | |
121 | msleep(60); | |
122 | spi_write(spi, (const u8 *)&slpin, sizeof(u16)); | |
123 | } else if (priv->lcd_state < FB_BLANK_POWERDOWN) { | |
124 | /* Do nothing, the LCD is already in standby */ | |
125 | } else { | |
126 | /* priv->lcd_state == FB_BLANK_POWERDOWN */ | |
127 | l4f00242t03_lcd_init(spi); | |
128 | priv->lcd_state = FB_BLANK_UNBLANK; | |
129 | l4f00242t03_lcd_power_set(ld, power); | |
130 | } | |
e7fb9c4a | 131 | } else { |
95558ad1 | 132 | /* power == FB_BLANK_POWERDOWN */ |
26bbabc8 AP |
133 | if (priv->lcd_state != FB_BLANK_POWERDOWN) { |
134 | /* Clear the screen before shutting down */ | |
135 | spi_write(spi, (const u8 *)&disoff, sizeof(u16)); | |
136 | msleep(60); | |
137 | l4f00242t03_lcd_powerdown(spi); | |
138 | } | |
e7fb9c4a AP |
139 | } |
140 | ||
95558ad1 AP |
141 | priv->lcd_state = power; |
142 | ||
e7fb9c4a AP |
143 | return 0; |
144 | } | |
145 | ||
146 | static struct lcd_ops l4f_ops = { | |
147 | .set_power = l4f00242t03_lcd_power_set, | |
95558ad1 | 148 | .get_power = l4f00242t03_lcd_power_get, |
e7fb9c4a AP |
149 | }; |
150 | ||
151 | static int __devinit l4f00242t03_probe(struct spi_device *spi) | |
152 | { | |
153 | struct l4f00242t03_priv *priv; | |
154 | struct l4f00242t03_pdata *pdata = spi->dev.platform_data; | |
155 | int ret; | |
156 | ||
157 | if (pdata == NULL) { | |
158 | dev_err(&spi->dev, "Uninitialized platform data.\n"); | |
159 | return -EINVAL; | |
160 | } | |
161 | ||
162 | priv = kzalloc(sizeof(struct l4f00242t03_priv), GFP_KERNEL); | |
163 | ||
164 | if (priv == NULL) { | |
165 | dev_err(&spi->dev, "No memory for this device.\n"); | |
beb0a43f | 166 | return -ENOMEM; |
e7fb9c4a AP |
167 | } |
168 | ||
169 | dev_set_drvdata(&spi->dev, priv); | |
170 | spi->bits_per_word = 9; | |
171 | spi_setup(spi); | |
172 | ||
173 | priv->spi = spi; | |
174 | ||
4f5a66b0 FE |
175 | ret = gpio_request_one(pdata->reset_gpio, GPIOF_OUT_INIT_HIGH, |
176 | "lcd l4f00242t03 reset"); | |
e7fb9c4a AP |
177 | if (ret) { |
178 | dev_err(&spi->dev, | |
179 | "Unable to get the lcd l4f00242t03 reset gpio.\n"); | |
beb0a43f | 180 | goto err; |
e7fb9c4a AP |
181 | } |
182 | ||
4f5a66b0 FE |
183 | ret = gpio_request_one(pdata->data_enable_gpio, GPIOF_OUT_INIT_LOW, |
184 | "lcd l4f00242t03 data enable"); | |
e7fb9c4a AP |
185 | if (ret) { |
186 | dev_err(&spi->dev, | |
187 | "Unable to get the lcd l4f00242t03 data en gpio.\n"); | |
beb0a43f | 188 | goto err2; |
e7fb9c4a AP |
189 | } |
190 | ||
0556dc34 MB |
191 | priv->io_reg = regulator_get(&spi->dev, "vdd"); |
192 | if (IS_ERR(priv->io_reg)) { | |
d59d9eba | 193 | ret = PTR_ERR(priv->io_reg); |
0556dc34 MB |
194 | dev_err(&spi->dev, "%s: Unable to get the IO regulator\n", |
195 | __func__); | |
196 | goto err3; | |
e7fb9c4a AP |
197 | } |
198 | ||
0556dc34 MB |
199 | priv->core_reg = regulator_get(&spi->dev, "vcore"); |
200 | if (IS_ERR(priv->core_reg)) { | |
d59d9eba | 201 | ret = PTR_ERR(priv->core_reg); |
0556dc34 MB |
202 | dev_err(&spi->dev, "%s: Unable to get the core regulator\n", |
203 | __func__); | |
204 | goto err4; | |
e7fb9c4a AP |
205 | } |
206 | ||
207 | priv->ld = lcd_device_register("l4f00242t03", | |
208 | &spi->dev, priv, &l4f_ops); | |
209 | if (IS_ERR(priv->ld)) { | |
210 | ret = PTR_ERR(priv->ld); | |
211 | goto err5; | |
212 | } | |
213 | ||
214 | /* Init the LCD */ | |
e7fb9c4a | 215 | l4f00242t03_lcd_init(spi); |
95558ad1 AP |
216 | priv->lcd_state = FB_BLANK_VSYNC_SUSPEND; |
217 | l4f00242t03_lcd_power_set(priv->ld, FB_BLANK_UNBLANK); | |
e7fb9c4a AP |
218 | |
219 | dev_info(&spi->dev, "Epson l4f00242t03 lcd probed.\n"); | |
220 | ||
221 | return 0; | |
222 | ||
223 | err5: | |
0556dc34 | 224 | regulator_put(priv->core_reg); |
e7fb9c4a | 225 | err4: |
0556dc34 | 226 | regulator_put(priv->io_reg); |
e7fb9c4a AP |
227 | err3: |
228 | gpio_free(pdata->data_enable_gpio); | |
229 | err2: | |
230 | gpio_free(pdata->reset_gpio); | |
231 | err: | |
232 | kfree(priv); | |
233 | ||
234 | return ret; | |
235 | } | |
236 | ||
237 | static int __devexit l4f00242t03_remove(struct spi_device *spi) | |
238 | { | |
239 | struct l4f00242t03_priv *priv = dev_get_drvdata(&spi->dev); | |
240 | struct l4f00242t03_pdata *pdata = priv->spi->dev.platform_data; | |
241 | ||
95558ad1 | 242 | l4f00242t03_lcd_power_set(priv->ld, FB_BLANK_POWERDOWN); |
e7fb9c4a AP |
243 | lcd_device_unregister(priv->ld); |
244 | ||
95558ad1 AP |
245 | dev_set_drvdata(&spi->dev, NULL); |
246 | ||
e7fb9c4a AP |
247 | gpio_free(pdata->data_enable_gpio); |
248 | gpio_free(pdata->reset_gpio); | |
249 | ||
0556dc34 MB |
250 | regulator_put(priv->io_reg); |
251 | regulator_put(priv->core_reg); | |
e7fb9c4a AP |
252 | |
253 | kfree(priv); | |
254 | ||
255 | return 0; | |
256 | } | |
257 | ||
95558ad1 AP |
258 | static void l4f00242t03_shutdown(struct spi_device *spi) |
259 | { | |
260 | struct l4f00242t03_priv *priv = dev_get_drvdata(&spi->dev); | |
261 | ||
262 | if (priv) | |
263 | l4f00242t03_lcd_power_set(priv->ld, FB_BLANK_POWERDOWN); | |
264 | ||
265 | } | |
266 | ||
e7fb9c4a AP |
267 | static struct spi_driver l4f00242t03_driver = { |
268 | .driver = { | |
269 | .name = "l4f00242t03", | |
270 | .owner = THIS_MODULE, | |
271 | }, | |
272 | .probe = l4f00242t03_probe, | |
273 | .remove = __devexit_p(l4f00242t03_remove), | |
95558ad1 | 274 | .shutdown = l4f00242t03_shutdown, |
e7fb9c4a AP |
275 | }; |
276 | ||
462dd838 | 277 | module_spi_driver(l4f00242t03_driver); |
e7fb9c4a AP |
278 | |
279 | MODULE_AUTHOR("Alberto Panizzo <maramaopercheseimorto@gmail.com>"); | |
280 | MODULE_DESCRIPTION("EPSON L4F00242T03 LCD"); | |
c3cf2e44 | 281 | MODULE_LICENSE("GPL v2"); |